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CN207946501U - A kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system - Google Patents

A kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system Download PDF

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Publication number
CN207946501U
CN207946501U CN201820317161.7U CN201820317161U CN207946501U CN 207946501 U CN207946501 U CN 207946501U CN 201820317161 U CN201820317161 U CN 201820317161U CN 207946501 U CN207946501 U CN 207946501U
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raspberry
module
line monitoring
mechanical breakdown
monitoring system
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CN201820317161.7U
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Inventor
刘静
沈鑫
王昕�
陈德祥
高松
何傲
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Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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Abstract

This application provides a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system, which includes:Switch position signal acquisition module, switching value acquisition module, Raspberry Pi, A/D conversion modules, envelope detector, amplifier, vibrating sensor, current transformer, current signal conditioning module;Vibrating sensor, amplifier and envelope detector are sequentially connected;Current transformer is connect with current signal conditioning module;A/D conversion modules are connect with switch position signal acquisition module, envelope detector, current signal conditioning module and Raspberry Pi respectively;Switching value acquisition module is connect with Raspberry Pi.Whole system is simple in structure, small, at low cost, small power consumption, easy for installation, avoids that component in existing system is difficult to install, and the big problem of power consumption realizes the on-line monitoring to load switch of transformer mechanical breakdown.

Description

A kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system
Technical field
This application involves mechanical breakdown on-line monitoring system technical field more particularly to a kind of on-load tap changers of transformers Mechanical breakdown on-line monitoring system.
Background technology
Load ratio bridging switch is unique movable component and critical component in transformer body, be a kind of is transformer The switching device of constant voltage is provided when loading variation, the action of load ratio bridging switch accurately and timely not only can be reduced and be kept away Exempt from fluctuating widely for voltage, and distribution load trend can be forced, idle and active, the guarantee electric system of excavating equipment Safe and reliable operation increases the flexibility of dispatching of power netwoks.
In power transmission and transformation industry now, high-power transformer is all widely mounted with on-load voltage regulating switch, to ensureing system Play an important role with the quality of voltage of user, thus on-load tap changers of transformers regularly overhaul it is very necessary.It is existing Have and selects vibration acceleration sensor in technology, Hall current sensor, information collection control module, power supply, microprocessor, shows Display screen, button, memory, clock, communication interface, alarm, angular displacement sensor are online as on-load tap changers of transformers The device of monitoring can be sensed under on-load tap changers of transformers electriferous state using microprocessor detection vibration acceleration The output signal of device, angular displacement sensor and Hall current sensor obtains detection numerical value, is not reported if preset range if numerical value Alert device sends out alarm signal.
It although may be implemented to monitor on-load tap changers of transformers on-line by above-mentioned apparatus, but above-mentioned apparatus Complicated, power consumption is big, and wherein angular displacement sensor is difficult to install and angular displacement sensor at work can hold loaded tap-off Pass has a certain impact.
Utility model content
This application provides a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring systems, to solve existing monitoring The problem that system structure is complicated, power consumption is big, difficult to install.
The system includes:Switch position signal acquisition module, switching value acquisition module, Raspberry Pi, A/D conversion modules, packet Network wave detector, amplifier, vibrating sensor, current transformer, current signal conditioning module;
The vibrating sensor, the amplifier and the envelope detector are sequentially connected;
The current transformer is connect with the current signal conditioning module;
The A/D conversion modules respectively with the switch position signal acquisition module, the Raspberry Pi, the envelope detection Device and current signal conditioning module connection;
The switching value acquisition module is connect with the Raspberry Pi.
Optionally, which further includes alarm, and the alarm is connect with the Raspberry Pi.
Optionally, which further includes MicroSD cards, and the built-in card slot in the Raspberry Pi is arranged in the MicroSD cards It is interior.
Optionally, the switching value acquisition module includes:Motor power Collection module, on-load voltage regulating switch are slided Shelves signal acquisition module, on-load voltage regulating switch period imperfect signal acquisition module and an intake module.
Optionally, the intake module passes through relay control system.
Optionally, the current signal conditioning module includes filter module and signal amplification module.
Optionally, the Raspberry Pi data transmittal and routing form is web data transmission form.
Optionally, the chip of the A/D conversion modules is ADC0809 chips.
Optionally, the Raspberry Pi is Raspberry Pi 2B types.
Technical solution provided by the present application includes following advantageous effects:
This application provides a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system, which includes:It opens Close gear signal acquisition module, switching value acquisition module, Raspberry Pi, A/D conversion modules, envelope detector, amplifier, vibration biography Sensor, current transformer, current signal conditioning module.The application is based on vibroacoustics and driving motor current detecting principle, leads to The vibroacoustics signal generated when vibrating sensor detection on-load voltage regulating switch action is crossed, has load to adjust by current transformer detection Compress switch action when driving motor current signal, by the current signal of switch position signal acquisition transformer, more accurately Ground is diagnosed and is assessed in place to whether on-load voltage regulating switch contact switches, and is carried out just to the signal of acquisition using Raspberry Pi Ground processing, the data handled well are transferred to main website by Ethernet, when failure, alarm action, and display display appearance Fault type, the Raspberry Pi performance selected in system is good, cheap, small so that whole system is simple in structure, volume It is small, it is at low cost, small power consumption, easy for installation, it avoids existing system and brings difficult to install, system work(with angular displacement sensor Big problem is consumed, to realize the on-line monitoring to load switch of transformer mechanical breakdown.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor, Other drawings may also be obtained based on these drawings.
Fig. 1 is on-load tap changers of transformers mechanical breakdown on-line monitoring system schematic diagram provided by the embodiments of the present application;
Fig. 2 is bleeder circuit figure provided by the embodiments of the present application.
Fig. 3 is that switching value acquisition module provided by the embodiments of the present application accesses circuit diagram;
Reference sign:
1, switch position signal acquisition module;2, switching value acquisition module;3, Raspberry Pi;4, A/D conversion modules;5, envelope Wave detector;6, amplifier;7, vibrating sensor;8, current transformer;9, current signal conditioning module;10, alarm;11、 MicroSD cards.
Specific implementation mode
This application involves a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system, which includes:Switch Gear signal acquisition module 1, Raspberry Pi 3, A/D conversion modules 4, envelope detector 5, amplifier 6, shakes at switching value acquisition module 2 Dynamic sensor 7, current transformer 8, current signal conditioning module 9.
The driving current signal of current sensor measurement driving motor will be seen that working condition and the portion of drive system Situations such as abrasion of part, bite, lubrication, but can only as a kind of monitoring means of auxiliary, can only for drive system bite or The larger failure of driving moment.Vibration signal is detected, the status information respectively acted that analysis load ratio bridging switch operation generates has Effect judge Contact Breaking/Making Operations, switching whether in place, operating mechanism with the presence or absence of the failures such as casey and failure, but it is easy by external environment Influence the more clean vibration signal of more difficult acquisition.So switch position signal acquisition module 1 is added in the application convenient for more Accurately diagnosed in place to whether the contact on on-load tap changers of transformers switches.
Switch position signal acquisition module 1 is to pass through the primary current of current sensor to perforate transformer CT output lines, The electric current of bushing shell for transformer is detected by current sensor, the signal that electric current becomes 4~20mA is output to A/D conversion modules 4, finally Collected current signal is handled by Raspberry Pi 3.
Optionally, the current sensor that the application selects is CHB-300S closed loop Hall current sensors, measures model Enclose that wide wide, good linearity, working band, fast response time, high certainty of measurement, dynamic property is good, reliability is high, overload capacity By force, small, light-weight, be easily installed, by obtain transformer current signal come on on-load tap changers of transformers Whether contact switches is diagnosed in place.
Switching value acquisition module 2 includes:Motor power Collection module, on-load voltage regulating switch slide piece signal acquisition Module, on-load voltage regulating switch period imperfect signal acquisition module and an intake module.The module work principle be By load ratio bridging switch whether slide piece, period complete and motor power whether Conversion fault is switching value.By Raspberry Pi Interface directly acquires, and after initializing Raspberry Pi interface, directly acquires signal, global variable array is arrived in update.But due to The voltage of on-off model output is 5V, and the switching voltage of the interface of Raspberry Pi 3 input is up to 3.3V, and the application devises One bleeder circuit is made of two resistance, and resistance value is respectively 18K Ω and 33K Ω, and connection type is as shown in Fig. 2, by partial pressure The processing of circuit, switching value directly can handle analysis by Raspberry Pi 3.
The acquisition mode of intake module is as shown in figure 3, motor contactor auxiliary contact one end connection relay coil end Son, the other end connect relay coil terminal, the normally closed point connection mainboard common end of relay and Raspberry Pi 3 by 12V power supplys On interface, opened point connects on mainboard 3.3V and the interface of Raspberry Pi 3, and in systems, program cycle reads the interface of Raspberry Pi 3 State, system is without any operation, when it is high to detect the state of Raspberry Pi 3, system when the state of Raspberry Pi 3 is low Data acquisition and processing (DAP) is then carried out, judges whether on-load tap changers of transformers acts, display can be shown normally when being failure to actuate, Then system is switched to dormant state to reduce power consumption.
Raspberry Pi 3 is a microcomputer motherboards based on ARM, using SD/MicroSD cards as memory hard disk, card mainboard Surrounding has 1/2/4 USB interface and 10/100 Ethernet interface, can connect keyboard, mouse and cable, while possessing video The TV output interface and HDMI HD video output interfaces of analog signal, one is all incorporated into upper-part and only compares credit card On slightly larger mainboard, have the basic function of all PC, only need to connect television set and keyboard, such as electrical form, text can be executed Word processing plays game, plays the various functions such as HD video.For being used to handle vibrating sensor 7, Current Mutual Inductance in the application Device 8,2 collected signal of switching value acquisition module.
Optionally, the application selects 2B types Raspberry Pi 3, and 2B types Raspberry Pi 3 has HDMI output interface, embedded with bluetooth, interior Set memory card slot and multiple USB interfaces.Display, inside installation MicroSD cards can be connected by HDMI output interface 11, wireless mouse is accessed, USB interface connection keyboard, switch position signal acquisition module 1, A/D conversion modules 4 and switching value are adopted Collect module 2, be not necessarily to external connector, whole system volume is made to become smaller, component has been saved on the basis of acquisition signal comprehensively, Reduce power consumption.
A/D conversion modules 4 are used to be used to acquire by vibrating sensor 7 the analog vibration acoustics of on-load tap changers of transformers Signal is converted into digital signal, while the analog current signal of the acquisition transformer driving motor of current transformer 8 being converted into counting Word signal is handled convenient for Raspberry Pi 3, and the A/D conversion chips of the application select ADC0809 chips, ADC0809 chip processing data Speed it is fast, precision is high, low in energy consumption, reduce the use cost of system and do not influence the accuracy of data.
Envelope detector 5 is to carry out carrying out low-pass filtering again by the low frequency in amplitude-modulated signal after unidirectionally filtering using diode Signal, which demodulates, to be come, event simple using envelope detection circuit, low in energy consumption, efficient, relatively low to incipient failure and signal-to-noise ratio Hinder the transformer loaded tap-off that code distinguishability is strong, is detected for can accurately filter out vibrating sensor 7 in the application The vibration signal of switch is convenient for 3 analyzing processing of Raspberry Pi.
Amplifier 6 is used for the voltage of collected vibration signal or power amplification, to ensure that it is full that Raspberry Pi 3 receives The signal level of meaning and the communication that adjacent channel will not be interfered.
Optionally, the application selects low-power integrated operational amplifier that 7 collected signal of vibrating sensor is carried out work( Rate is amplified, and electric current is very small when which works, and voltage is also very low, and the power consumption of entire amplifier 6 is only tens microwatts, institute To reduce the power consumption of whole system.
Vibrating sensor 7 is used to acquire the vibroacoustics signal of on-load tap changers of transformers, and the application selects vibration to pass Sensor 7 is piezoelectric acceleration transducer, and model LC0151T piezoelectric acceleration transducers, linear frequency scale is 0.7~10KHZ, precision 150mv/g, measurement frequency range is wide, range is big, it is light-weight, small, to testee shadow Sound is small and easy to install and use.
Piezoelectric acceleration transducer is measured using spring mass system principle, and sensitive core body quality is vibrated It will produce a power directly proportional to acceleration after acceleration effect, piezoelectric material can be formed after by the effect of this power along its surface The charge signal directly proportional to this power.
Optionally, there are two types of output forms, i.e. charge output type and voltage output type for piezoelectric acceleration transducer.This Shen Low-impedance voltage output type piezoelectric acceleration transducer, the charge letter of sensor output please be select to pass through sensor internal Preamplifier 6 is converted into voltage signal in low impedance output, using two wires output form, voltage constant current source power supply, power supply and letter Number use same root line, constant-current source power output end by vibrate conditioning module direct current part is filtered off.The piezoelectric type accelerates Degree sensor measurement signal is high-quality, noise is small, supports telemeasurement and external interference resistance strong.
Current transformer 8 is used to acquire the current signal of transformer driving motor, when the driving mechanism of load ratio bridging switch Occur casey in short-term, attachment device causes that frictional force increases or driving motor breaks down the drive for causing to provide due to oil starvation It when kinetic moment deficiency catastrophe failure, can all be reflected in the variation of driving motor electric current, the transformer that current transformer 8 acquires drives Dynamic motor current signal, the failure that can be used for diagnosing transformer driving motor will produce moment when motor is initially powered startup Excitation surge current, so starting again to signal acquisition after 0.5 second in electric motor starting when measuring current signal.
Optionally, the current transformer 8 that the application selects is voltage output type current mutual inductor, model JTl0T32 Type pincer current sensor, working power are direct current ± 12V, can measure 0 and arrive 10A ac and dc currents, output voltage arrives for 0 1V, O.1%, the response time is less than 5 μ s to the linearity, which does not need external power supply, and internal conversion circuit is directly output as Voltage;Primary and secondary side high-insulation, secondary side output can really reflect the waveform of primary current, can measure AC DC arteries and veins simultaneously Rush electric current;Has the function of protection to error-polarity connection of power supply;Hand-held, installation are simple and convenient;Totally enclosed type can be in harsh environment It uses.
Current signal conditioning module 9 is that the current signal for the driving motor that current transformer 8 acquires is filtered and is put Big processing for eliminating out-of-band noise, and facilitates follow-up 4 sampling processing of A/D conversion modules.
Alarm 10 is when the signal that Raspberry Pi 3 has received and processed is more than 10 preset value of alarm, to the hair of failure Life is alarmed, for being convenient for staff timely to know the generation of failure in the application and completing inspection, repair.
MicroSD cards 11 are used to store Raspberry Pi 3 and receive and the various information of processing, small, capacity is big, using and Data export is convenient, is built in the card slot of Raspberry Pi 3, no longer needs to external memorizer, has saved the space of whole system, reduces Power consumption.
Further include display in the application, which is used for the working condition and failure of a component in real-time display system Information.
Optionally, display selects OLED color line screens, the OLED color line screens to use very thin coating of organic material and glass Glass substrate is made, thinner lighter, visible angle bigger, while also more power saving.
Further include in the application background monitoring equipment be used for by a region Microcomputer Protection and electric instrument pass through it is total Gauze network completes local acquisition and processing, is networked by Ethernet interface and Raspberry Pi 3, and Raspberry Pi 3 is received by Ethernet interface Collect data, and assigns control instruction.
The workflow of load switch of transformer mechanical breakdown on-line monitoring system is in the application:
1, Raspberry Pi 3 is initialized after being powered, and setting electric current high alarm setting value after initialization, display, which is shown, works as Preceding time, on-load tap changers of transformers location information are in standby detecting state, wait for divide-shut brake order;
2, on-load tap changers of transformers separating brake or switch knob are pressed, switch position signal acquisition module 1, vibration pass Sensor 7, current transformer 8 and switching value acquisition module 2 receive separating brake or order of closing a floodgate simultaneously, and start acquisition vibration The current signal of signal and driving motor.
3, vibration signal is handled via amplifier 6 and envelope detector 5, is sent into A/D conversion modules 4 and is sampled, to signal into Row conversion, into the processing of Raspberry Pi 3.
4, driving current signal is adopted after eliminating out-of-band noise through A/D conversion modules 4 by being filtered and enhanced processing Sample converts signal, into the processing of Raspberry Pi 3.
3, information acquisition module sends high or low level signal to Raspberry Pi 3, Raspberry Pi 3 start to the signal of input into Row treatment in situ, the data handled well are compared with high alarm setting value, if being higher than high alarm setting value, alarm 10 sends out alarm Signal, display shows fault message, and data are transferred to main website by Ethernet.
This application provides a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system, which includes:It opens Close gear signal acquisition module, switching value acquisition module, Raspberry Pi, A/D conversion modules, envelope detector, amplifier, vibration biography Sensor, current transformer, current signal conditioning module.The application is based on vibroacoustics and driving motor current detecting principle, leads to The vibroacoustics signal generated when vibrating sensor detection on-load voltage regulating switch action is crossed, has load to adjust by current transformer detection Compress switch action when driving motor current signal, by the current signal of switch position signal acquisition transformer, more accurately Ground is diagnosed and is assessed in place to whether on-load voltage regulating switch contact switches, and is carried out just to the signal of acquisition using Raspberry Pi Ground processing, the data handled well are transferred to main website by Ethernet, when failure, alarm action, and display display appearance Fault type, the Raspberry Pi performance selected in system is good, cheap, small so that whole system is simple in structure, volume It is small, it is at low cost, small power consumption, easy for installation, it avoids existing system and brings difficult to install, system work(with angular displacement sensor Big problem is consumed, to realize the on-line monitoring to load switch of transformer mechanical breakdown.
It should be noted that such as the terms "include", "comprise" or its any other variant are intended to nonexcludability Include but also include not bright so that article or equipment including a series of elements include not only those elements The other element really listed, or further include for elements inherent to such a process, method, article, or device.Do not having In the case of more limitations, the element that is limited by sentence "including a ...", it is not excluded that including the element process, There is also other identical elements in method, article or equipment.
The above is only the specific implementation mode of the application, is made skilled artisans appreciate that or realizing this Shen Please.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein General Principle can in other embodiments be realized in the case where not departing from spirit herein or range.Therefore, the application It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.
It should be understood that the application is not limited to the content for being described above and being shown in the accompanying drawings, and can To carry out various modifications and change without departing from the scope.Scope of the present application is only limited by the accompanying claims.

Claims (9)

1. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system, which is characterized in that the system includes:Switch shelves Position signal acquisition module (1), Raspberry Pi (3), A/D conversion modules (4), envelope detector (5), is put switching value acquisition module (2) Big device (6), vibrating sensor (7), current transformer (8), current signal conditioning module (9);
The vibrating sensor (7), the amplifier (6) and the envelope detector (5) are sequentially connected;
The current transformer (8) connect with the current signal conditioning module (9);
The A/D conversion modules (4) respectively with the switch position signal acquisition module (1), the Raspberry Pi (3), the packet Network wave detector (5) and the current signal conditioning module (9) connection;
The switching value acquisition module (2) connect with the Raspberry Pi (3).
2. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the system further includes alarm (10), and the alarm (10) connect with the Raspberry Pi (3).
3. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the system further includes MicroSD cards (11), built-in card slot of MicroSD cards (11) setting in the Raspberry Pi (3) It is interior.
4. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the switching value acquisition module (2) includes:Motor power Collection module, on-load voltage regulating switch slide piece signal are adopted Collect module, on-load voltage regulating switch period imperfect signal acquisition module and an intake module.
5. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 4, feature exist In the intake module passes through relay control system.
6. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the current signal conditioning module (9) includes filter module and signal amplification module.
7. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In Raspberry Pi (3) data transmittal and routing form is web data transmission form.
8. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the chip of the A/D conversion modules (4) is ADC0809 chips.
9. a kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system according to claim 1, feature exist In the Raspberry Pi (3) is Raspberry Pi 2B types.
CN201820317161.7U 2018-03-08 2018-03-08 A kind of on-load tap changers of transformers mechanical breakdown on-line monitoring system Active CN207946501U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109061459A (en) * 2018-08-30 2018-12-21 国网北京市电力公司 The fault determination method and device of on-load voltage regulating switch, storage medium, processor
CN109443717A (en) * 2018-10-16 2019-03-08 国网江苏省电力有限公司南京供电分公司 A kind of load ratio bridging switch mechanical breakdown on-line monitoring method
CN109581211A (en) * 2018-11-13 2019-04-05 国网江苏省电力有限公司南京供电分公司 A kind of load ratio bridging switch mechanical breakdown on-line monitoring method based on current of electric
CN109856501A (en) * 2019-01-13 2019-06-07 广西电网有限责任公司南宁供电局 A kind of on-load tap changers of transformers and winding deformation fault detection method
CN111562425A (en) * 2020-04-22 2020-08-21 南方电网科学研究院有限责任公司 Transformer harmonic wave, vibration and on-load tap-changer state monitoring system
JP2023169851A (en) * 2022-05-17 2023-11-30 サンイル エレクトリック カンパニー リミテッド Electronic type tap changer control device of tap-changing transformer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109061459A (en) * 2018-08-30 2018-12-21 国网北京市电力公司 The fault determination method and device of on-load voltage regulating switch, storage medium, processor
CN109443717A (en) * 2018-10-16 2019-03-08 国网江苏省电力有限公司南京供电分公司 A kind of load ratio bridging switch mechanical breakdown on-line monitoring method
CN109581211A (en) * 2018-11-13 2019-04-05 国网江苏省电力有限公司南京供电分公司 A kind of load ratio bridging switch mechanical breakdown on-line monitoring method based on current of electric
CN109856501A (en) * 2019-01-13 2019-06-07 广西电网有限责任公司南宁供电局 A kind of on-load tap changers of transformers and winding deformation fault detection method
CN111562425A (en) * 2020-04-22 2020-08-21 南方电网科学研究院有限责任公司 Transformer harmonic wave, vibration and on-load tap-changer state monitoring system
JP2023169851A (en) * 2022-05-17 2023-11-30 サンイル エレクトリック カンパニー リミテッド Electronic type tap changer control device of tap-changing transformer

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