CN105182043B - Detection device with non-contact sensor to UHVDC Arrester leakage current - Google Patents

Abstract

Detection device with non-contact sensor to UHVDC Arrester leakage current, including data acquisition unit, data processing unit, protect circuit unit and power supply unit, data acquisition unit includes current sensor, power amplifier and circuit acquisition module, current sensor includes a toroidal shell, the magnetic core of one C-shaped arrangement and a precision electromagnetic sensor, an accommodating space is provided with toroidal shell, rotating around equipped with a first coil winding and a second coil winding on magnetic core, and the magnetic core is installed in the accommodating space, magnetic flux density direction caused by the second coil winding is opposite with the magnetic flux density direction of the first coil winding.The present invention is acquired lightning arrester leakance using contactless, it thereby may be ensured that collecting unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability is greatly lifted, but also can have stronger self- recoverage and adaptive ability under overvoltage.

Description

Detection device with non-contact sensor to UHVDC Arrester leakage current

Technical field

The present invention relates to UHVDC Transmission Lines arrester state inspection, refer in particular to non-contact sensor to spy The detection device of high voltage direct current leakage current of an arrester.

Background technology

With China's rapid economic development, electricity needs increases rapidly, and there are in electric power resource distribution and load in China The unmatched natural characteristic in heart district domain is, it is necessary to by remote, large capacity transmission circuit improvement imbalance between power supply and demand problem, " west Send in electric east ", the engineering such as " north and south supply mutually " be major deployments scheme at this stage, extra-high voltage direct-current transmission technology is specific to implement skill Art means.

Alternating current is transformed into direct current by direct current transportation by transverter, is then sent by DC power transmission line to receiving end And alternating current is become by transverter, finally inject AC network.The voltage class concept of extra-high voltage direct-current transmission is defeated with exchanging Electricity is different.For ac transmission, 220kV and following voltage class are generally known as high pressure, the title of 330~750kV For super-pressure, the referred to as extra-high voltage of 1000kV and the above.Direct current transportation is then slightly different, and ± more than 100kV's is referred to as high pressure； ± 500kV and ± 600kV are still referred to as high pressure, are not known as super-pressure generally；And then it is known as extra-high voltage more than ± 600kV.

± 800kV extra-high voltage direct-current transmissions can have a large amount of big load centers of electric power direct sending defeated since centre is without drop point Send that capacity is big, power transmission distance is remote, saves the advantages that transmission of electricity stringing corridor, relevant device research and development, control are with the technology such as running and showing Model engineering is rapidly developed and extensive use in recent years, China is in world's neck in UHV transmission technical field First status, leads technological development direction and key equipment Development Trend.

The construction of extra-high voltage DC transmission system, be unable to do without overvoltage protection, direct current arrester is extra-high voltage direct-current The key equipment of transmission system overvoltage protection, determines the dielectric level of whole system, influences equipment volume, project occupation of land face Product and cost.It is most important for the Insulation Coordination of optimization system and reduction project cost to improve protection of arrester level.Grasp Direct current arrester real-time running state and protection feature are to strengthening the operational management of direct-current ultra high voltage transmission system equipment, improving it Live detection technology and the horizontal tool of repair based on condition of component are of great significance.

For now, the service condition of direct current arrester is much harsher than alternating-current lightning arrestor, to direct current arrester The technical requirements that runnability proposes are very high.Direct current arrester structure, operating condition, action principle, protection feature etc. with friendship It is different to flow arrester.In order to find the making moist of direct current arrester, aging and other hidden danger in time, avoid huge caused by accident Economic loss, while improving ultra-high voltage lightning arrester product reliability, strengthening quality control, carries out ultra-high voltage lightning arrester It is urgent that line monitors significant and demand.Particularly need one kind to be directed in a hurry to keep away extra-high voltage direct-current with non-contact sensor The detection device and detection method of thunder device leakage current.

Chinese utility model patent（CN202693723U）A kind of leakage current of an arrester alarm system is disclosed, including is kept away Thunder device and counter, arrester are connected with the first current transformer and the second current transformer for switching current, the first electricity Current transformer is connected with reference voltage circuit, and reference voltage is added on first voltage conversion circuit, the second electricity by reference voltage circuit Current transformer is connected with first voltage conversion circuit, and first voltage conversion circuit is powered for the first warning device, and first voltage turns Change circuit and be connected with the progress secondary voltage conversion of second voltage conversion circuit, second voltage conversion circuit is that the second warning device supplies Electricity.Although above leakage current alarm system principle is simple, alarm effect is obvious, but during actual use also Have the following disadvantages：1st, above leakage current alarm system is mainly in transmission line of alternation current, since arrester exists Service condition in extra high voltage direct current transmission line is much harsher than alternating-current lightning arrestor, the self-insurance particularly in Lightning Over-voltage Shield requirement may also be difficult to reach, thus the technical requirements of leakage current alarm system can not meet in extra-high voltage direct-current transmission line Effectively and stably run in road；2nd, above leakage current alarm system major function is to carry out qualitative operation, can not be right All the time the big decimal fractions of middle leakage current are detected.

The content of the invention

The present invention provides the detection device with non-contact sensor to UHVDC Arrester leakage current, its main mesh Be overcome existing leakage current alarm system to UHVDC Arrester leakage current can not stablize and accurately examine The defects of survey.

In order to solve the above technical problems, the present invention adopts the following technical scheme that：

Detection device with non-contact sensor to UHVDC Arrester leakage current, including data acquisition unit, Data processing unit, protection circuit unit and power supply unit, the data acquisition unit include current sensor, power amplification Device and circuit acquisition module, the current sensor include a toroidal shell, the magnetic core of a C-shaped arrangement and an accurate magnetic Electric transducer, is provided with an accommodating space in the toroidal shell, on the magnetic core rotating around equipped with a first coil winding with And a second coil winding, and the magnetic core is installed in the accommodating space, and the precision electromagnetic sensor is also installed in institute State in accommodating space and its both ends and the both ends of the magnetic core to abut, input terminal and the arrester of the first coil winding leak Electric current is electrically connected, and the input terminal of the second coil winding is electrically connected with an output terminal of the power amplifier, the power Another output terminal of amplifier is electrically connected with the circuit acquisition module, magnetic flux density side caused by the second coil winding To opposite with the magnetic flux density direction of the first coil winding.

Further, diskette of the precision electromagnetic sensor including an arc-shaped arrangement is connected on the diskette Data contacts, the power amplifier include an operational amplifier being electrically connected with the data contacts output terminal, one the 1st Pole pipe, one second triode and an input power, the collector of first triode are electrically connected to the input power Positive interface, the collector of second triode are connected to the negative interface of the input power, the output of the power amplifier End is divided into two-way, is connected to the base stage of first triode all the way, another way is connected to the base stage of second triode, institute The amplifying stage for stating the first triode is divided into two-way, is connected to the input terminal of the second coil winding all the way, and another way is connected to The amplifying stage of second triode, the circuit acquisition module are connected to the second coil winding output terminal including one end Measure resistance R1 and the ammeter for measuring current values in the measurement resistance, another termination of the measurement resistance R1 Ground.

Further, the toroidal shell includes a shield shell and the insulation shell being arranged on the outside of the shield shell Body, the magnetic core include two symmetrically arranged arc pellets and a fixing pipe, and two arc pellets are respectively mutually abutted with one end, And it is socketed in the both sides of the abutted position by the fixing pipe, the arc pellet is made of nano amorphous material Arc pellet, the fixing pipe are nano amorphous material fixing pipe.

Further, the toroidal shell includes a shield shell and the insulation shell being arranged on the outside of the shield shell Body, the magnetic core include two symmetrically arranged arc pellets and a fixing pipe, and two arc pellets are respectively mutually abutted with one end, And it is socketed in the both sides of the abutted position by the fixing pipe, the arc pellet is made of amorphous soft magnetic material Arc pellet, the fixing pipe are amorphous soft magnet fixing pipe.

Further, the both ends of the diskette are respectively connected to one end of an arc pellet, shared by the diskette According to volume be the accommodating space volume a quarter, the volume occupied by the fixing pipe is the accommodating space volume A quarter, the volume not put on occupied by the part of fixing pipe in the arc pellet of the fixing pipe side is described The a quarter of accommodating space volume, does not put on shared by the part of fixing pipe in the arc pellet of the fixing pipe opposite side According to volume be the accommodating space volume a quarter, the second coil winding include upper second coil around portion and under For second coil around portion, upper second coil is set around around portion does not put on fixation in the arc pellet of the fixing pipe side The part of pipe, lower second coil is set around around portion does not put on fixing pipe in the arc pellet of the fixing pipe opposite side Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding is set around institute State the outside of fixing pipe.

Further, the detection device further includes a collection protection module, the electric energy output end point of the power supply unit Cheng Silu, is electrically connected the electrical energy inputs in protection circuit unit, the electrical energy inputs for gathering protection module, data acquisition The electrical energy inputs of unit and the electrical energy inputs of data processing unit, the output terminal of arrester electric current are divided into two-way, all the way The Enable Pin of the data acquisition unit is connected to, another way is connected to the Enable Pin of the collection protection module, the collection The output terminal of protection module is connected to the Enable Pin of the protection circuit unit, and the Enable Pin of the data processing unit is equipped with two Road, connects the output terminal of the data acquisition unit, the output terminal of the another way connection protection circuit unit, when lightning-arrest all the way Device electric current is less than or equal to 1 milliampere hour, and collection protection module is failure to actuate, and data acquisition unit starts and carries out signal to electric current Through being exported by data processing unit after collection and data processing；When arrester electric current is more than 1 milliampere hour, data acquisition unit is not Dynamic, and gather protection module startup, high-impedance state is presented to input in the detection device, at this time without signal acquisition and data at Reason, and exported via data processing unit.

Further, inert-gas diode and TVS diode are added in the extraction wire of the arrester electric current, The TVS diode differential concatenation is grounded.

Further, it is loaded with AC signal on the diskette and/or magnetic core.

Further, the toroidal shell is set on the ground wire of arrester and it includes the left shell half that can mutually dismantle Body and right half-shell body.

Further, the input terminal of the first coil winding adds inert-gas diode and TVS diode, should TVS diode differential concatenation is grounded.

Compared to the prior art, the beneficial effect that the present invention produces is:

1st, the configuration of the present invention is simple, highly practical, when the direct current signal of arrester leakage current passes through first coil winding The magnetic field produced afterwards in magnetic core is focused on precision electromagnetic sensor, and the voltage signal that precision electromagnetic sensor produces is through work( Rate amplifier conducting, which acts on, to produce Contrary compensation electric current in second coil winding, the magnetic flux and arrester that compensation electric current produces Flow direction caused by leakage current both on the contrary, after realizing magnetic balance, core flux zero, is mended in second coil winding Electric current is repaid again after the test of oversampling circuit acquisition module, that is, draws the direct current signal value of leakage current of an arrester, thus the present invention Lightning arrester leakance to be acquired using contactless, thereby may be ensured that collecting unit can in complex electromagnetic fields into Row is effectively and stably run, and not only voltage endurance capability is greatly lifted, but also can be had under overvoltage more by force from extensive Multiple and adaptive ability.

2nd, in the present invention, the modularization for being used for isolation detection electric current for core sensing element by using diskette is produced Product, its operation principle are to use magnetic balance type principle, i.e., when electric current flows through the straight wire of a root long, are produced around conducting wire Magnetic field, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can be assembled by soft magnetic materials, then It is detected with diskette, can since the change in magnetic field and the output voltage signal of diskette have good linear dependence The output signal measured using diskette, directly reflects the size of current in conducting wire, and the advantage of diskette is its Strong anti-interference ability, low temperature floats and high sensitivity, and particularly in the range of electric current is -1A to 1A electric currents, diskette is in magnetic Good symmetry and sensitivity are showed in terms of flux density.

3rd, in the present invention, after by loading AC signal on diskette, the magnetic flux density of diskette will be just To with reversely magnetize and demagnetize back and forth, can interrupt magnetic polarization process of the external electromagnetic field to magnetic material in this process.So It can be very good to avoid the magnetic polarization of magnetic material.Be conducive to improve the accuracy of detection and service life of the present invention.

4th, in the present invention, may be selected to install additional in all lead-in conductors, extraction wire and other parts being necessary lazy Property gas diode and TVS diodes prevent high current destroy circuit system.Since the TVS diodes startup time is fast, but It is that electric discharge continuous capability is poor；And the startup time of inert-gas diode is slow, electric discharge continuous capability is strong.So both make at the same time With can be good at solving the problems, such as circuit protection.

5th, in the present invention, complicated electromagnetic field to magnetic material in addition to it can cause the influence of magnetic polarization, it is also possible to shadow Ring the steady operation of electronic circuit.So the present invention can also realize electromagnetism in terms of wire laying mode, structure design and shell processing The function such as isolation, decoupling filtering, so as to enable a system to long-time steady operation.By setting shield shell and insulation shell, Advantageously reduced the magnetic flux leakage of magnetic core, accordingly improved measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, subtract Few measurement error.

6th, in the present invention, current sensor is by nano amorphous material, diskette, nano amorphous material fixing pipe and shielding Shell is formed.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.It is installed in nano amorphous material Fixed afterwards using fixing pipe, to ensure that the material can be docked preferably sensor at work.The present invention is in the magnetic material of selection During material, the problem of having fully taken into account heavy current impact.So we select nano amorphous and amorphous soft magnet as current sense The core material of device.Amorphous soft magnet and nano amorphous material have good recovery capability, are bearing the heavy current impact of moment Afterwards, can be very good to recover.

7th, in the present invention, when the direct current signal of arrester leakage current produces in magnetic core after first coil winding Magnetic field be focused on diskette, diskette, which senses, will produce voltage after this part magnetic flux density, what diskette produced Amplification of the voltage signal through operational amplifier completes the control of discharge to input power so that the positive interface of input power Contrary compensation electric current, the magnetic flux that compensation electric current produces and magnetic caused by arrester leakage current are exported on to second coil winding On the contrary, by control of the operational amplifier to Contrary compensation electric current, it is always definite value to make the magnetic flux density in magnetic core in logical direction, this When second coil winding on compensate electric current and be input to ground after measured resistance R1 again, by ammeter to measuring resistance R1 The current values of interior circulation, and it is to draw the direct current signal of leakage current of an arrester to carry out scale operation according to the current values Value, not only circuit structure is simple for above detection process, manufacturing cost is low, but also detection accuracy is high, can ensure signal detection Precision.

Brief description of the drawings

Fig. 1 is the schematic block circuit diagram of embodiment one in the present invention.

Fig. 2 is the structure diagram of heretofore described data acquisition unit.

Fig. 3 is the schematic block circuit diagram of each component in Fig. 2.

Fig. 4 is the scheme of installation of heretofore described toroidal shell.

Fig. 5 is the principle sketch of the data acquisition unit.

Fig. 6 is the diskette and Hall material current-magnetic flux density profile comparison schematic diagram.

Fig. 7 is the diskette and Hall material temperature drift curve comparison schematic diagram.

Fig. 8 is that current densities comparison schematic diagram after AC signal is loaded on diskette.

Fig. 9 is the schematic block circuit diagram of embodiment two in the present invention.

Embodiment

Illustrate the embodiment of the present invention with reference to the accompanying drawings.

Embodiment one

With reference to Fig. 1.A kind of online detecting system of UHVDC Arrester leakage current, including one be arranged at direct current and keep away The data sending that detection device 1 near thunder device, the leakage current testing result for the detection device 1 to be obtained are transmitted Device, data sink, central monitoring device and mobile terminal 3.The data sending device is single for public network signal transmitting Member 5, data sink is public network signal receiving unit 6.Public network signal transmitter unit 5 and public network signal receiving unit 6 can be with Pass through mobile public network（GSM network or GPRS network）Realize data transfer, public network signal receiving unit 6 is preferred in the present embodiment The communication mould of the modem of GSM network or GPRS network, 5 preferred GSM network of public network signal transmitter unit or GPRS network Block.The central monitoring device includes background processor 40 and holder 41, the input terminal connection of the background processor 40 In the data sink, the output terminal of the background processor 40 is connected to the mobile terminal 3 and above-mentioned storage Storage 41, the input terminal of the background processor 40 are also associated with an encryption unit 42, the output terminal connection of the holder 41 There is a terminal display 43.The Enable Pin of the data sink is connected to the output terminal of the data sending device, described The Enable Pin of central monitoring device is connected to the output terminal of the data sink, and the output terminal of the central monitoring device connects Connect the Enable Pin with the mobile terminal 3.By above-mentioned setting, maintenance personal can in time by the central monitoring device with Short message or other forms know the relevant information of direct current arrester leakage current, so as to both avoid maintenance personnel severe Weather is frequently patrolled surge arrester failure point, reduces the risk that maintenance personal gets an electric shock, and reduces the time recovered needed for line powering.

In the present embodiment, one can be built into and collect the various monitoring data of various regions UHVDC Arrester state Cloud platform, it generallys include the Cloud Server by net connection（As described central monitoring device）, cloud client（As institute State mobile terminal 3）With at least one measuring terminals（As it is arranged at the detection dress in each power grid on each UHVDC Arrester Put 1 or the detecting instrument and equipment of other direct current arrester status informations, the function of these detecting instruments and equipment includes It can realize grounding resistance, leakage current and harmonic wave, the electrostatic of the equipment such as measurement lightning protection or telecommunications, electric and electronics board Deng change）.In the system normal operation, measuring terminals are by net connection by data transfer to Cloud Server, cloud Client obtained from Cloud Server needed for measurement data, user inquires about measurement data by cloud client, shown, is defeated Go out, utilization, the operation such as assessment, realize the associations of the associated objects for being pointed to Different field that conventional measurement techniques can not be completed Tune or correlation measurement, so as to shorten time of measuring, realize and multiple measuring terminals are carried out at the same time with real time monitoring and to tested pair The long-range measurement of elephant, while be conducive to analyse and study thunder-strike phenomenon scientifically.

With reference to Fig. 1.The detection device 1 includes data acquisition unit 10, data processing unit 11, protection circuit unit 12nd, power supply unit 13 and one gathers protection module 14.

The electric energy output end of the power supply unit 13 is divided into four tunnels, be electrically connected in protection circuit unit 12 electric energy it is defeated Enter end, gather electrical energy inputs, the electrical energy inputs and data processing unit 11 of data acquisition unit 10 of protection module 14 Electrical energy inputs.At work, the output terminal of arrester electric current is divided into two-way, is connected to the data acquisition unit 10 all the way Enable Pin, another way be connected to it is described collection protection module 14 Enable Pin, it is described collection protection module 14 output terminal connect The Enable Pin of the protection circuit unit 12 is connected to, the Enable Pin of the data processing unit 11 is equipped with two-way, connects institute all the way State the output terminal of data acquisition unit 10, the output terminal of the another way connection protection circuit unit 12, when arrester electric current is small In or equal to 1 milliampere hour, collection protection module 14 is failure to actuate, and data acquisition unit 10 starts and carries out signal acquisition to electric current Exported with being passed through after data processing by data processing unit 11；When arrester electric current is more than 1 milliampere hour, data acquisition unit 10 is not It is dynamic, and gather protection module 14 and start, input is presented high-impedance state in the detection device 1, at this time without signal acquisition sum number Exported according to processing, and via data processing unit 11.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The data acquisition unit 10 includes current sensor 7, power amplifier 8, electricity Road acquisition module 9.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The current sensor 7 includes a toroidal shell 70, the magnetic of a C-shaped arrangement 71 and one precision electromagnetic sensor 72 of core, is provided with an accommodating space 700 in the toroidal shell 70, on the magnetic core 71 point A first coil winding 710 and a second coil winding 711 are not arranged with, and the magnetic core 71 is installed on the accommodating space In 700, the precision electromagnetic sensor 72 is also installed in the accommodating space 700 and its both ends and the two of the magnetic core 71 End adjoining, the input terminal of the first coil winding 710 are electrically connected with lightning arrester leakance, the second coil winding 711 Input terminal is electrically connected with an output terminal of the power amplifier 8, another output terminal and the circuit of the power amplifier 8 Acquisition module 9 is electrically connected, magnetic flux density direction caused by the second coil winding 711 and the first coil winding 710 Magnetic flux density direction it is opposite.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The precision electromagnetic sensor 72 includes the diskette 720 of an arc-shaped arrangement The data contacts 721 being connected on the diskette 720, the power amplifier 8 include one and 721 output terminal of data contacts The operational amplifier 80 of electrical connection, one first triode 81, one second triode 82 and an input power 83, the described 1st The collector of pole pipe 81 is electrically connected to the positive interface 830 of the input power 83, the collector connection of second triode 82 In the negative interface 831 of the input power 83, the output terminal of the power amplifier 8 is divided into two-way, is connected to described all the way The base stage of one triode 81, another way are connected to the base stage of second triode 82, the amplifying stage of first triode 81 It is divided into two-way, is connected to the input terminal of the second coil winding 711 all the way, another way is connected to second triode 82 Amplifying stage, the circuit acquisition module 9 include one end be connected to the measurement resistance R1 of 711 output terminal of second coil winding with And for measuring the ammeter A of current values in the measurement resistance, the other end ground connection of the measurement resistance R1.When arrester leaks The magnetic field that the direct current signal of electric current produces after first coil winding 710 in magnetic core 71 is focused into precision electromagnetic sensing On device, the voltage signal that precision electromagnetic sensor produces is acted on through power amplifier conducting so that being produced in second coil winding anti- To compensation electric current, the magnetic flux that compensation electric current produces is with flow direction caused by arrester leakage current on the contrary, when the two is realized After magnetic balance, core flux zero, electric current is compensated in second coil winding again after the test of oversampling circuit acquisition module, that is, is drawn The direct current signal value of leakage current of an arrester, thus one aspect of the present invention is that lightning arrester leakance is adopted using contactless Collection, thereby may be ensured that collecting unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability obtains To greatly being lifted, and can have stronger self- recoverage and adaptive ability under overvoltage.Another aspect of the present invention can be with Online acquisition is carried out to the faint circuit signal of the microampere order of magnitude, and direct current can be monitored at any time by central monitoring device and taken shelter from the thunder The change of leakage current, harmonic wave and electrostatic etc. in device, can effectively prevent lightning protection telecommunications or electric and electronics board etc. from setting It is standby to influence the earthing effect of lightning stroke because grounding resistance is excessive, effectively prevent to cause damage and the injures and deaths of building and people and animals, And be conducive to extend the service life of arrester.The present embodiment also utilizes diskette to be used for isolation detection for core sensing element The modular product of electric current, its operation principle is to use magnetic balance type principle, i.e., when electric current flows through the straight wire of a root long, Magnetic field is produced around conducting wire, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can pass through soft magnetism Material is assembled, and is then detected with diskette, due to the change in magnetic field and the output voltage signal of diskette have it is good Linear dependence, therefore the output signal measured using diskette, directly reflect the size of current in conducting wire, and diskette Advantage be its strong anti-interference ability, low temperature floats and high sensitivity, particularly electric current for -1A to 1A electric currents model In enclosing, diskette shows good symmetry and sensitivity in terms of magnetic flux density.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 includes a shield shell 701 and is arranged at the shielding The insulation shell 702 in the outside of housing 701, the magnetic core 71 include two symmetrically arranged 714 and one fixing pipes of arc pellet 715, two arc pellets 714 are respectively mutually abutted with one end, and pass through 715 sets of the fixing pipe in the both sides of the abutted position On, the arc pellet 714 is arc pellet 714 made of nano amorphous material, and the fixing pipe 715 is nano amorphous material Fixing pipe 715.Current sensor is made of nano amorphous material, diskette, nano amorphous material fixing pipe and shielding shell.For Facilitate installation, nano amorphous material made HALF structures by us.Fixation is used after nano amorphous material installs Pipe is fixed, to ensure that the material can be docked preferably sensor at work.The present invention is fully examined when selecting magnetic material The problem of having considered heavy current impact.So we select nano amorphous and magnetic core material of the amorphous soft magnet as current sensor Material.Amorphous soft magnet and nano amorphous material have good recovery capability, can be very after the heavy current impact of moment is born Good recovery.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The both ends of the diskette 720 are respectively connected to the one of an arc pellet 714 End, volume occupied by the diskette 720 are a quarter of 700 volume of accommodating space, shared by the fixing pipe 715 According to volume be 700 volume of accommodating space a quarter, in the arc pellet 714 of 715 side of fixing pipe The a quarter that the volume occupied by the part of fixing pipe 715 is 700 volume of accommodating space is not put on, positioned at the fixation It is the accommodating space 700 not put on the volume occupied by the part of fixing pipe 715 in the arc pellet 714 of 715 opposite side of pipe The a quarter of volume, the second coil winding 711 include upper second coil around portion and lower second coil around portion, it is described on Second coil is set around the part for not putting on fixing pipe 715 in the arc pellet 714 of 715 side of fixing pipe around portion, Lower second coil is set around around portion does not put on fixing pipe 715 in the arc pellet 714 of 715 opposite side of fixing pipe Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding 710 is set around The outside of the fixing pipe 715.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Added in the extraction wire of the arrester electric current inert-gas diode with And TVS diode, TVS diode differential concatenation ground connection.The present embodiment all lead-in conductors, extraction wire and other have must Installation inert-gas diode and TVS diodes, which may be selected, in the part wanted prevents high current from destroying circuit system.Due to The TVS diodes startup time is fast, but the continuous capability that discharges is poor；And the startup time of inert-gas diode is slow, electric discharge is held Continuous ability is strong.So both uses at the same time can be good at solving the problems, such as circuit protection.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.AC signal is loaded with the diskette 720 and/or magnetic core 71.By After upper AC signal is loaded on diskette, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, at this A process can interrupt magnetic polarization process of the external electromagnetic field to magnetic material.So it can be very good to avoid the magnetic pole of magnetic material Change.Be conducive to improve the accuracy of detection and service life of the present invention.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 be set on the ground wire 16 of arrester and it include can The left shell half body 705 and right half-shell body 706 mutually dismantled.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.When arrester leakage current direct current signal after first coil winding in magnetic The magnetic field produced in core is focused on diskette, and diskette will produce voltage, soft magnetism after sensing this part magnetic flux density Amplification of the voltage signal through operational amplifier that piece produces completes the control of discharge to input power so that input power Positive interface to exporting Contrary compensation electric current in second coil winding, the magnetic flux and arrester leakage current institute that compensation electric current produces The flow direction of generation makes magnetic flux density in magnetic core all the time on the contrary, by control of the operational amplifier to Contrary compensation electric current For definite value, electric current is compensated in second coil winding at this time and is input to ground after measured resistance R1 again, passes through ammeter pair The current values of circulation in resistance R1 are measured, and carries out scale operation according to the current values and draws leakage current of an arrester Direct current signal value, not only circuit structure is simple for above detection process, manufacturing cost is low, but also detection accuracy is high, can ensure Signal detection precision.

Further, since complicated electromagnetic field to magnetic material in addition to it can cause the influence of magnetic polarization, it is also possible to influence electricity The steady operation of sub-circuit.So the present invention can also realize electromagnetic isolation in terms of wire laying mode, structure design and shell processing, The functions such as decoupling filtering, so as to enable a system to long-time steady operation.By setting shield shell and insulation shell, be conducive to Reduce the magnetic flux leakage of magnetic core, accordingly improve measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, reduce measurement Error.

With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The online detecting of the corresponding UHVDC Arrester leakage current of the present embodiment Method, comprises the following steps：

A, judge whether to carry out signal acquisition, when arrester electric current is higher than threshold value set in advance, bis- poles of TVS to electric current Pipe can be actuated for release current rapidly, and inert-gas diode is started afterwards, sustained release electric current.

B, signal acquisition is carried out to electric current, when the direct current signal of arrester leakage current is after first coil winding 710 The magnetic field produced in magnetic core 71 is focused on precision electromagnetic sensor 72, the voltage signal that precision electromagnetic sensor 72 produces Acted on through 8 conducting of power amplifier and to produce Contrary compensation electric current in second coil winding 711, the magnetic flux that compensation electric current produces With arrester leakage current caused by flow direction on the contrary, after realizing magnetic balance both, 71 magnetic flux of magnetic core is zero, the second line On circle winding 711 compensation electric current draws the direct current signal of leakage current of an arrester again after the test of oversampling circuit acquisition module 9 Value is hence into next step.More specifically, when arrester leakage current direct current signal after first coil winding 710 The magnetic field produced in magnetic core 71 is focused on diskette 720, and diskette 720 will produce after sensing this part magnetic flux density Voltage, amplification of the voltage signal through operational amplifier 80 that diskette 720 produces complete the electric discharge to input power 83 Control so that the positive interface 830 of input power 83 is produced to output Contrary compensation electric current in second coil winding 711, compensation electric current Raw magnetic flux is with flow direction caused by arrester leakage current on the contrary, by operational amplifier 80 to Contrary compensation electric current Control, it is always definite value to make the magnetic flux density in magnetic core 71, compensates electric current measured electricity again in second coil winding 711 at this time Be input to ground after resistance R1, by ammeter A to the current values that circulate in measurement resistance R1, and according to the current values into Row scale operation is the direct current signal value for drawing leakage current of an arrester, hence into next step.

C, the output of electric current Value Data is formed after the signal of collection is handled.

D, the current data of acquisition is collected by being wirelessly transmitted in central monitoring device, data processing unit 11 After being handled by data operation, by public network signal transmitter unit 5 by the direct current signal value containing leakage current of an arrester, survey The coding of amount time or arrester installation site information is sent to public network signal receiving unit 6 in the form of short message.

E, central monitoring device shows that current data distribution is sent to corresponding arrester management by the current data at the same time The mobile terminal 3 of person, is specially after background processor 40 receives the short message of coding form, to change, will encode into row information Information is converted into Chinese information and is sent on the mobile terminal 3 of related management personnel or maintenance personal, and in holder 41 forever Kubo deposits above- mentioned information.

In addition, running through whole on-line checking process, have to being loaded with exchange on the diskette 720 and/or magnetic core 71 Signal, on diskette 720 and/or magnetic core 71 in loading after AC signal, the magnetic flux of diskette 720 and/or magnetic core 71 is close Degree will magnetize and demagnetize back and forth in forward and reverse, and magnetic polarization of the external electromagnetic field to magnetic material can be interrupted in this process Journey.

With reference to Fig. 5.The testing principle of the present invention specifically includes：Electric current I1 and I2 are produced on two windings respectively The opposite magnetic flux density of B1 and B2 both directions, the two magnetic flux densities cancel each other in precision electromagnetic sensing station.So The magnetic field collected afterwards according to precision electromagnetic sensor adjusts the size of I2, and to make B1+B2 be definite value.Then I2 is measured Stool and urine be known that the size of I1.The core of part of data acquisition is precision electromagnetic sensor.The applicant is by grinding Study carefully investigation, magnetic field acquisition method can use hall device, but hall device nonlinear degree is larger, antijamming capability pole It is weak, low to small-signal sensitivity, so can not be used in the UHVDC Arrester equipment.Therefore, in the present embodiment, Magnetic field collector uses special soft magnetic materials, and the advantage of soft magnetic materials is its strong anti-interference ability, low temperature float with it is highly sensitive Degree.

With reference to Fig. 6.As seen from Figure 6, diskette is in the range of electric current is -1A to 1A electric currents, in magnetic flux density Aspect shows good symmetry and sensitivity.

With reference to Fig. 7.Fig. 7 is the temperature drift curve of soft magnetic materials and Hall sensor.In the figure 7 we can see that Soft magnetic materials temperature drift at -40 degrees Celsius to 100 degrees Celsius is very small, this explanation soft magnetic materials can be more severe In the environment of work.Within the temperature range of -40 degrees Celsius to 100 degrees Celsius, current acquisition is made using soft magnetic materials During device, error will be less than 2%.

With reference to Fig. 8.Fig. 8 is the situation to diskette loading AC signal.Submitted as can be seen that being loaded on diskette After flowing signal, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, and outside can be interrupted in this process Magnetic polarization process of the electromagnetic field to magnetic material.So it can be very good to avoid the magnetic polarization of magnetic material.

In addition, the soft magnetic materials used in the present embodiment experiment is the NS358 materials provided by former Shanghai Steel and Iron Research Institute Material, but repeatedly tested by the applicant, diskette can also complete this item application made from other kinds of soft magnetic materials Purpose.And nano amorphous material is provided by magnetisable material and device key lab of the Chinese Academy of Sciences.Also pass through the application People repeatedly tests, and magnetic core can also complete the purpose of this item application made from other kinds of nano amorphous material.

Embodiment two

The present embodiment and the embodiment of embodiment one are substantially the same, its difference is：The data sending device Including in sequentially connected emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52, the data Reception device is the public network signal receiving unit 6 being connected with the output terminal of the dual mode communication unit 52.

It can cause the present embodiment both can be in the range of having had public network covering by electric circuit inspection numerical value using above-mentioned setting Central monitoring device is transferred to, the emission of radio frequency signals unit and frequency modulation can also be passed through in the region of no public network signal Lightning strike information, is first dealt into the dual mode communication unit being arranged in public network coverage, passed again afterwards by the cooperation of retransmission unit It is defeated to arrive central monitoring device, the applicable situation of the present invention can be so widened significantly so that be located in some remote mountains or thick forest Direct current arrester can also real-time online detect the information of its leakage current.

The present embodiment can be automatically selected in frequency range by the cooperation of emission of radio frequency signals unit and frequency modulation retransmission unit The farthest frequency point of propagation distance launches the current data collected, can overcome the single frequency point propagation distance too short Defect so that applicable situation of the invention is broader.

Further, since the present embodiment is otherwise varied for data sending device and embodiment one, thus the present embodiment is to spy The online method for detecting of high voltage direct current arrester leakage circuit is also different, its difference is：

On the one hand, step d includes data processing unit after data operation processing, will contain leakage current of an arrester Direct current signal value, the coding of time of measuring or arrester installation site information passes through emission of radio frequency signals unit and frequency modulation turns The cooperation of bill member, ensure communication channel it is unimpeded in the case of, coding information is passed through in a manner of private network automatic frequency-hopping Level-one is forwarded on the bimodulus communication unit of mobile public network signal coverage areas, then again by bimodulus communication unit with short message Form is sent to public network signal receiving unit.

On the other hand, after step e receives the short message of coding form including background processor, changed into row information, will Coding information is converted into Chinese information and is sent on the mobile terminal of related management personnel or maintenance personal, and in holder forever Kubo deposits above- mentioned information.

The embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this Conceive the change that unsubstantiality is carried out to the present invention, the behavior for invading the scope of the present invention should all be belonged to.

Claims (5)

1. with non-contact sensor to the detection device of UHVDC Arrester leakage current, it is characterised in that：Including data Collecting unit, data processing unit, protection circuit unit and power supply unit, the data acquisition unit include current sense Device, power amplifier and circuit acquisition module, the current sensor include a toroidal shell, the magnetic core of a C-shaped arrangement And a precision electromagnetic sensor, an accommodating space is provided with the toroidal shell, rotating around equipped with one on the magnetic core One coil windings and a second coil winding, and the magnetic core is installed in the accommodating space, the precision electromagnetic sensing Device is also installed in the accommodating space and its both ends and the both ends of the magnetic core and abuts, the input of the first coil winding End is electrically connected with lightning arrester leakance, and the input terminal of the second coil winding and an output terminal of the power amplifier are electrically connected Connect, another output terminal of the power amplifier is electrically connected with the circuit acquisition module, produced by the second coil winding Magnetic flux density direction it is opposite with the magnetic flux density direction of the first coil winding；The toroidal shell includes a shield shell And the insulation shell on the outside of the shield shell is arranged at, the magnetic core is solid including two symmetrically arranged arc pellets and one Fixed tube, two arc pellets are respectively mutually abutted with one end, and are socketed in the both sides of the abutted position by the fixing pipe, The arc pellet is arc pellet made of amorphous soft magnetic material, and the fixing pipe is amorphous soft magnet fixing pipe；The annular Housing is set on the ground wire of arrester and it includes the left shell half body and right half-shell body that can mutually dismantle；The detection dress Put and further include a collection protection module, the electric energy output end of the power supply unit is divided into four tunnels, is electrically connected in protection circuit At the electrical energy inputs of unit, the electrical energy inputs for gathering protection module, the electrical energy inputs of data acquisition unit and data The electrical energy inputs of unit are managed, the output terminal of arrester electric current is divided into two-way, is connected to making for the data acquisition unit all the way Energy end, another way are connected to the Enable Pin of the collection protection module, and the output terminal for gathering protection module is connected to described The Enable Pin of circuit unit is protected, the Enable Pin of the data processing unit is equipped with two-way, connects the data acquisition list all the way The output terminal of member, the output terminal of the another way connection protection circuit unit, when arrester electric current is less than or equal to 1 milliampere hour, Collection protection module is failure to actuate, and data acquisition unit starts and passes through by data after carrying out signal acquisition and data processing to electric current Processing unit exports；When arrester electric current is more than 1 milliampere hour, data acquisition unit is motionless, and gathers protection module startup, described High-impedance state is presented to input in detection device, at this time without signal acquisition and data processing, and is exported via data processing unit.

2. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special Sign is：Diskette of the precision electromagnetic sensor including an arc-shaped arrangement is connected to the data contacts on the diskette, The power amplifier includes an operational amplifier being electrically connected with the data contacts output terminal, one first triode, one the Two triodes and an input power, the collector of first triode are electrically connected to the positive interface of the input power, institute The collector for stating the second triode is connected to the negative interface of the input power, and the output terminal of the power amplifier is divided into two Road, is connected to the base stage of first triode all the way, and another way is connected to the base stage of second triode, and the described 1st The amplifying stage of pole pipe is divided into two-way, is connected to the input terminal of the second coil winding all the way, and another way is connected to described second The amplifying stage of triode, the circuit acquisition module include the measurement resistance that one end is connected to the second coil winding output terminal R1 and the ammeter for measuring current values in the measurement resistance, the other end ground connection of the measurement resistance R1.

3. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special Sign is：Inert-gas diode and TVS diode are added in the extraction wire of the arrester electric current, bis- poles of TVS Pipe differential concatenation is grounded.

4. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 3, it is special Sign is：AC signal is loaded with the diskette and/or magnetic core.

5. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special Sign is：The input terminal of the first coil winding adds inert-gas diode and TVS diode, the TVS diode Differential concatenation is grounded.