CN105588976B - Voltage and current combined sensor and measure voltage ＆ current system - Google Patents
Voltage and current combined sensor and measure voltage ＆ current system Download PDFInfo
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- CN105588976B CN105588976B CN201510981010.2A CN201510981010A CN105588976B CN 105588976 B CN105588976 B CN 105588976B CN 201510981010 A CN201510981010 A CN 201510981010A CN 105588976 B CN105588976 B CN 105588976B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
This application provides a kind of voltage and current combined sensor and measure voltage ＆ current system, voltage and current combined sensor includes：Fixing bracket, movable support, the first conducting wire fixed mechanism and the second conducting wire fixed mechanism, set lever, link mechanism, electric-field sensor probe and magnetic field sensor probe head；Electric-field sensor probe includes：PCB substrate, first electrode group, second electrode group, the first binding post and the second binding post, first electrode group include the first electrode of multiple semicircular configurations being sequentially connected in series, and second electrode group includes the second electrode of multiple semicircular configurations being sequentially connected in series；Magnetic field sensor probe head includes the first iron core, the second iron core, Rogowski coil, third binding post and the 4th binding post.The voltage and current combined sensor that the application provides reduces insulating Design cost, and do not need to directly be electrically connected with transmission line of electricity to be detected, improves safety.
Description
Technical field
This application involves power domain, more particularly to a kind of voltage and current combined sensor and measure voltage ＆ current system
System.
Background technology
The voltage of transmission line of electricity, current measurement and the safe and reliable and economical operation of electric system are closely related, are electric power
Important link in system maintenance.Efficiently, safe measurement method is the effective way for improving maintenance efficiency and grid supply quality
Diameter.
Voltage, current measurement are mainly realized by mutual inductor in current power transmission circuit, and traditional mutual inductor need with it is defeated
Electric line is directly electrically connected, and is required height to the insulation performance of mutual inductor, is caused insulating Design of high cost, and mutual inductance
Device needs are directly electrically connected with transmission line of electricity, and safety is poor.
+
Invention content
In order to solve the above technical problems, the embodiment of the present application provides a kind of voltage and current combined sensor and voltage and current
Detecting system reduces insulating Design cost, and improve the purpose of safety to reach, and technical solution is as follows：
A kind of voltage and current combined sensor, including：Fixing bracket, movable support, the first conducting wire fixed mechanism and
Two conducting wire fixed mechanisms, set lever, link mechanism, electric-field sensor probe and magnetic field sensor probe head；
The electric-field sensor probe includes：PCB substrate, first electrode group, second electrode group, the first binding post and second
Binding post, the first electrode group include the first electrode of multiple semicircular configurations being sequentially connected in series, the second electrode group packet
Include the second electrode of multiple semicircular configurations being sequentially connected in series；
The magnetic field sensor probe head includes the first iron core, the second iron core, Rogowski coil, third binding post and the 4th wiring
Column；
First iron core is fixedly connected with the fixing bracket, and second iron core is fixed with the movable support to be connected
It connects, first iron core and second iron core are semicircular configuration and are oppositely arranged, the electric-field sensor probe and institute
It states fixing bracket to be fixedly connected and be arranged close to first iron core, the first conducting wire fixed mechanism and the fixing bracket
It is fixedly connected and is arranged in the open area of first iron core, the second conducting wire fixed mechanism is consolidated with the movable support
It connects and is arranged in the open area of second iron core calmly, the movable support can move on the fixing bracket, institute
Movable support is stated to connect with the set lever by the link mechanism；
The first electrode group is arranged on the front of the PCB substrate, and the second electrode group is arranged on the PCB substrate
Reverse side, and the first electrode group and the second electrode group are staggered, and first binding post is respectively with each first
Electrode is connected, and second binding post is connected respectively with each second electrode；
The Rogowski coil is wrapped on first iron core and second iron core, the third binding post and sieve
One end of family name's coil is connected, and the 4th binding post is connected with the other end of the Rogowski coil；
When the first conducting wire fixed mechanism and the second conducting wire fixed mechanism are locked on transmission line of electricity to be detected,
The first electrode group and the second electrode group are in the electromagnetic field of the transmission line of electricity and generate potential difference signal, described
Potential difference signal is by first binding post and second stud conductor to voltage check device, and the Rogowski coil
In electromagnetic field in the transmission line of electricity to be detected and induced electromotive force signal is generated, the induced electromotive force signal passes through institute
Third binding post and the 4th stud conductor are stated to current sensing means.
Preferably, the first conducting wire fixed mechanism is specially：Rubber the first conducting wire fixed mechanism；
The second conducting wire fixed mechanism is specially：Rubber the second conducting wire fixed mechanism.
Preferably, first iron core is specially：Silicon steel sheet；
Second iron core is specially：Silicon steel sheet.
Preferably, the fixing bracket is specially：Polytetrafluoroethylene (PTFE) fixing bracket；
The movable support is specially：Polytetrafluoroethylene (PTFE) movable support.
Preferably, the fixing bracket is specially：Nylon plastic(s) fixing bracket；
The movable support is specially：Nylon plastic(s) movable support.
A kind of measure voltage ＆ current system, including：Voltage check device, current sensing means and such as above-mentioned any one institute
The voltage and current combined sensor stated；
The voltage check device is connected with the voltage and current combined sensor, the current sensing means with it is described
Voltage and current combined sensor is connected；
The voltage check device, at the potential difference signal that is exported to the voltage and current combined sensor
Reason, obtains the voltage of transmission line of electricity to be detected；
The current sensing means, for the induced electromotive force signal that the voltage and current combined sensor exports into
Row processing, obtains the electric current of the transmission line of electricity to be detected.
Preferably, the voltage check device includes：First pre-differential amplifier circuit, the first bandwidth-limited circuit,
One Programmable Gain Amplifier Circuit, the first A/D conversion circuits and first processor；
First pre-differential amplifier circuit, for filtering out the common mode interference signal in the potential difference signal, obtains
First sub- potential difference signal；
First bandwidth-limited circuit for filtering out the high-frequency interferencing signal in the described first sub- potential difference signal, obtains
To the second sub- potential difference signal；
First Programmable Gain Amplifier Circuit for being amplified to the described second sub- potential difference signal, obtains
Three sub- potential difference signals；
The first A/D conversion circuits, for the sub- potential difference signal of the third to be converted to the first digital signal；
The first processor for first digital signal to be multiplied by predeterminated voltage proportionality coefficient, obtains described treat
Detect the voltage of transmission line of electricity.
Preferably, the current sensing means includes：Second pre-differential amplifier circuit, the second bandwidth-limited circuit,
Two Programmable Gain Amplifier Circuits, the 2nd A/D conversion circuits and second processor；
Second pre-differential amplifier circuit, for filtering out the common mode interference signal in the induced electromotive force signal,
Obtain the first sub- induced electromotive force signal；
Second bandwidth-limited circuit, for filtering out the letter of the High-frequency Interference in the described first sub- induced electromotive force signal
Number, obtain the second sub- induced electromotive force signal；
Second Programmable Gain Amplifier Circuit is amplified for induced electromotive force signal to described second, obtains
To the sub- induced electromotive force signal of third；
The 2nd A/D conversion circuits, for the sub- induced electromotive force signal of the third to be converted to the second digital signal；
The second processor for second digital signal to be multiplied by predetermined current proportionality coefficient, obtains described treat
Detect the electric current of transmission line of electricity.
Compared with prior art, the application has the beneficial effect that：
In this application, voltage and current combined type is sensed by the first conducting wire fixed mechanism and the second conducting wire fixed mechanism
Device is fixed on transmission line of electricity to be detected, by the detection to the electromagnetic field around transmission line of electricity to be detected, is realized to be detected
The detection of the voltage and current of transmission line of electricity does not need to directly be electrically connected with transmission line of electricity to be detected, therefore to electricity
The insulation performance of current voltage combined sensor is of less demanding, reduces insulating Design cost, and do not need to it is to be detected defeated
Electric line is directly electrically connected, and improves safety.
Description of the drawings
In order to illustrate more clearly of the technical solution in the embodiment of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present application, for
For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of structure diagram for the voltage and current combined sensor that the application provides；
Fig. 2 is a kind of structure diagram when the voltage and current combined sensor that the application provides is locked；
Fig. 3 is a kind of structure diagram of electric-field sensor probe that the application provides；
Fig. 4 is a kind of structure diagram of voltage and current combined sensor installation that the application provides；
Fig. 5 is another structure diagram of voltage and current combined sensor installation that the application provides；
Fig. 6 is a kind of logical construction schematic diagram for the measure voltage ＆ current system that the application provides；
Fig. 7 is a kind of logical construction schematic diagram for the voltage check device that the application provides；
Fig. 8 is a kind of logical construction schematic diagram for the current sensing means that the application provides.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall in the protection scope of this application.
Embodiment one
In the present embodiment, a kind of voltage and current combined sensor is shown, please also refer to Fig. 1 to Fig. 5, voltage electricity
Stream combined sensor includes：Fixing bracket 1, movable support 2, the first conducting wire fixed mechanism 3 and the second conducting wire fixed mechanism 4,
Set lever 5, link mechanism 6, electric-field sensor probe 7 and magnetic field sensor probe head.
The electric-field sensor probe 7 includes：PCB substrate 11, first electrode group, second electrode group, the first binding post 12
With the second binding post 13, the first electrode group includes the first electrode 14 of multiple semicircular configurations being sequentially connected in series, and described
Two electrode groups include the second electrode 15 of multiple semicircular configurations being sequentially connected in series.
The magnetic field sensor probe head includes the first iron core 18, the second iron core 19, Rogowski coil, third binding post and the 4th
Binding post；
First iron core 18 is fixedly connected with the fixing bracket 1, and second iron core 19 is solid with the movable support 2
Fixed connection, first iron core 18 and second iron core 19 are semicircular configuration and are oppositely arranged, the electric-field sensor
Probe 7 is fixedly connected with the fixing bracket 1 and is arranged close to first iron core 18, the first conducting wire fixed mechanism 3
It is fixedly connected and is arranged in the open area of first iron core 18 with the fixing bracket 1, second conducting wire fixes machine
Structure 4 is fixedly connected with the movable support 2 and is arranged in the open area of second iron core 19, and the movable support 2 can
It is moved on the fixing bracket 1, the movable support 2 is connect by the link mechanism 6 with the set lever 5.
The first electrode group is arranged on the front of the PCB substrate 11, and the second electrode group is arranged on the PCB bases
The reverse side of plate 11, and the first electrode group and the second electrode group are staggered, first binding post 12 respectively with respectively
A first electrode 14 is connected, and second binding post 13 is connected respectively with each second electrode 15.
The Rogowski coil is wrapped on first iron core 18 and second iron core 19, the third binding post and institute
The one end for stating Rogowski coil is connected, and the 4th binding post is connected with the other end of the Rogowski coil.
It is locked on transmission line of electricity to be detected in the first conducting wire fixed mechanism 3 and the second conducting wire fixed mechanism 4
When, the first electrode group and the second electrode group are in the electromagnetic field of the transmission line of electricity and generate potential difference signal,
The potential difference signal is transmitted to voltage check device, and described by first binding post 12 and second binding post 13
Rogowski coil is in the electromagnetic field of the transmission line of electricity to be detected and generates induced electromotive force signal, the induced electromotive force letter
Number pass through the third binding post and the 4th stud conductor to current sensing means.
In the present embodiment, it is locked at power transmission line to be detected in the first conducting wire fixed mechanism 3 and the second conducting wire fixed mechanism 4
During road, electric-field sensor probe 7 keeps coaxial direction, first electrode group and the second electrode group with transmission line of electricity to be detected
In electromagnetic field in the transmission line of electricity, the surface of each first electrode 14 and the surface of each second electrode 15 can sense
Go out charge, since first electrode group and second electrode group are earth-free, the accumulation induced is on the surface of electrode, and
One electrode group is staggered with second electrode group to realize that first electrode group is different with the current potential of second electrode group, forms potential difference
Signal.
In this application, voltage and current combined type is passed by the first conducting wire fixed mechanism 3 and the second conducting wire fixed mechanism 4
Sensor is fixed on transmission line of electricity to be detected, by the detection to the electromagnetic field around transmission line of electricity to be detected, is realized to be checked
The detection of the voltage and current of transmission line of electricity is surveyed, does not need to directly be electrically connected with transmission line of electricity to be detected, therefore right
The insulation performance of voltage and current combined sensor is of less demanding, reduces insulating Design cost, and do not need to it is to be detected
Transmission line of electricity is directly electrically connected, and improves safety.
Further, since electric-field sensor probe 7 is without iron core, there is no need to consider that ferromagnetic resonance phenomenon gives power grid electricity
The influence that energy quality is brought.
And voltage and current combined sensor is not electrically connected directly with transmission line of electricity to be detected, can not powered off
In the case of installed, it is easy to install and use.
In the present embodiment, though the conducting wire of transmission line of electricity have country standard, its conducting wire of different voltages grade it is thick
It is carefully different, therefore to adapt to, model is different to be led the first conducting wire fixed mechanism 3 of design with the second conducting wire fixed mechanism 4
Line.When tensing set lever 5, the first conducting wire fixed mechanism 3 and the second conducting wire fixed mechanism 4 can tightly be stuck in transmission line of electricity
On so that electric-field sensor probe 7 and magnetic field sensor probe head keep coaxial direction with transmission line of electricity, meet the requirement of detection.
In the present embodiment, the first conducting wire fixed mechanism 3 is specifically as follows the first conducting wire of rubber fixed mechanism 3, and second leads
Line fixed mechanism 4 is specifically as follows the second conducting wire of rubber fixed mechanism 4, i.e. the first conducting wire fixed mechanism 3 and the second conducting wire is fixed
Mechanism 4 is using rubber material.
In the present embodiment, first iron core 18 is specially：Silicon steel sheet；Second iron core 19 is specially：Silicon steel sheet.
In the present embodiment, the fixing bracket 1 is specially：Polytetrafluoroethylene (PTFE) fixing bracket；The movable support 2 is specific
For：Polytetrafluoroethylene (PTFE) movable support.
Certainly, the fixing bracket 1 may be：Nylon plastic(s) fixing bracket；The movable support 2 is：Nylon plastic(s)
Movable support.
When in the present embodiment, using voltage and current combined sensor, the stock P that insulate can be utilized by voltage and current group
Box-like sensor card is first opened voltage and current combined sensor, as shown in Figure 4 on transmission line of electricity.Work as voltage and current
When combined sensor is stuck on transmission line of electricity, the handle of insulation stock is pressed, voltage and current combined sensor is made to be in lock
Then tight state removes insulation stock, voltage and current combined sensor just can be fixed on transmission line of electricity, as shown in Figure 5.
Embodiment two
In the present embodiment, a kind of measure voltage ＆ current system is provided, refers to Fig. 6, measure voltage ＆ current system includes：
Voltage check device 61, current sensing means 62 and voltage and current combined sensor 63.
The concrete structure and correlation function of voltage and current combined sensor 63 refer to the voltage electricity shown in embodiment one
Combined sensor is flowed, details are not described herein.
The voltage check device 61 is connected with the voltage and current combined sensor 63, the current sensing means 62
It is connected with the voltage and current combined sensor 63.
The voltage check device 61, for the potential difference signal that the voltage and current combined sensor 63 exports into
Row processing, obtains the voltage of transmission line of electricity to be detected.
The current sensing means 62, for the induced electromotive force letter exported to the voltage and current combined sensor 63
It number is handled, obtains the electric current of the transmission line of electricity to be detected.
In the present embodiment, the voltage check device 61 includes：First pre-differential amplifier circuit 71, the filter of the first band logical
Wave circuit 72, the first Programmable Gain Amplifier Circuit 73, the first A/D conversion circuits 74 and first processor 75.
First pre-differential amplifier circuit 71, for filtering out the common mode interference signal in the potential difference signal, obtains
To the first sub- potential difference signal.
First bandwidth-limited circuit 72, for filtering out the high-frequency interferencing signal in the described first sub- potential difference signal,
Obtain the second sub- potential difference signal.
First Programmable Gain Amplifier Circuit 73 for being amplified to the described second sub- potential difference signal, obtains
The sub- potential difference signal of third.
The first A/D conversion circuits 74, for the sub- potential difference signal of the third to be converted to the first digital signal.
The first processor 75 for first digital signal to be multiplied by predeterminated voltage proportionality coefficient, obtains described
The voltage of transmission line of electricity to be detected.
Due to the potential difference in voltage and current combined sensor 63 between first electrode group and second electrode group with it is to be checked
The voltage linear relationship of transmission line of electricity is surveyed, therefore the first digital signal is multiplied by predeterminated voltage proportionality coefficient, you can is treated
Detect the voltage of transmission line of electricity.
Wherein, predeterminated voltage proportionality coefficient can be determined by experiment.
Current sensing means 62 includes：Second pre-differential amplifier circuit 81, the second bandwidth-limited circuit 82, second can be compiled
Journey gain amplifying circuit 83, the 2nd A/D conversion circuits 84 and second processor 85.
Second pre-differential amplifier circuit 81, for filtering out the letter of the common mode interference in the induced electromotive force signal
Number, obtain the first sub- induced electromotive force signal.
Second bandwidth-limited circuit 82, for filtering out the letter of the High-frequency Interference in the described first sub- induced electromotive force signal
Number, obtain the second sub- induced electromotive force signal.
Second Programmable Gain Amplifier Circuit 83 is amplified for induced electromotive force signal to described second,
Obtain the sub- induced electromotive force signal of third.
The 2nd A/D conversion circuits 84 are believed for the sub- induced electromotive force signal of the third to be converted to the second number
Number.
The second processor 85 for second digital signal to be multiplied by predetermined current proportionality coefficient, obtains described
The electric current of transmission line of electricity to be detected.
In the present embodiment, due to the electric current of the induced electromotive force and transmission line of electricity to be detected of magnetic field sensor probe head output
It is in a linear relationship, therefore the second digital signal is multiplied by the electricity that predetermined current proportionality coefficient can obtain transmission line of electricity to be detected
Stream.
In the present embodiment, predetermined current proportionality coefficient is determined by experiment.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference from other examples, and just to refer each other for identical similar part between each embodiment.
For device class embodiment, since it is basicly similar to embodiment of the method, so description is fairly simple, related part is joined
See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little elements, but also including other elements that are not explicitly listed or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except also there are other identical elements in the process, method, article or apparatus that includes the element.
A kind of voltage and current combined sensor provided herein and measure voltage ＆ current system are carried out above
It is discussed in detail, the principle and implementation of this application are described for specific case used herein, above example
Illustrate to be merely used to help understand the present processes and its core concept；Meanwhile for those of ordinary skill in the art, according to
According to the thought of the application, the there will be changes in specific embodiment+and application range, in conclusion in this specification
Hold the limitation that should not be construed as to the application.
Claims (6)
1. a kind of voltage and current combined sensor, which is characterized in that including：Fixing bracket, movable support, the first conducting wire are fixed
Mechanism and the second conducting wire fixed mechanism, set lever, link mechanism, electric-field sensor probe and magnetic field sensor probe head；
The electric-field sensor probe includes：PCB substrate, first electrode group, second electrode group, the first binding post and the second wiring
Column, the first electrode group include the first electrode of multiple semicircular configurations being sequentially connected in series, and the second electrode group includes more
The second electrode of a semicircular configuration being sequentially connected in series；
The magnetic field sensor probe head includes the first iron core, the second iron core, Rogowski coil, third binding post and the 4th binding post；
First iron core is fixedly connected with the fixing bracket, and second iron core is fixedly connected with the movable support, institute
It states the first iron core and second iron core is semicircular configuration and is oppositely arranged, the electric-field sensor probe and the fixation
Stent is fixedly connected and is arranged close to first iron core, and the first conducting wire fixed mechanism is fixed with the fixing bracket to be connected
It connects and is arranged in the open area of first iron core, the second conducting wire fixed mechanism is fixedly connected with the movable support
And be arranged in the open area of second iron core, the movable support can move on the fixing bracket, the activity
Stent is connect by the link mechanism with the set lever；
The first electrode group is arranged on the front of the PCB substrate, and the second electrode group is arranged on the anti-of the PCB substrate
Face, and the first electrode group and the second electrode group are staggered, first binding post respectively with each first electrode
It is connected, second binding post is connected respectively with each second electrode；
The Rogowski coil is wrapped on first iron core and second iron core, the third binding post and the Roche line
One end of circle is connected, and the 4th binding post is connected with the other end of the Rogowski coil；
It is described when the first conducting wire fixed mechanism and the second conducting wire fixed mechanism are locked on transmission line of electricity to be detected
First electrode group and the second electrode group are in the electromagnetic field of the transmission line of electricity and generate potential difference signal, the current potential
Difference signal is by first binding post and second stud conductor to voltage check device, and the Rogowski coil is in
In the electromagnetic field of the transmission line of electricity to be detected and induced electromotive force signal is generated, the induced electromotive force signal passes through described
Three binding posts and the 4th stud conductor are to current sensing means.
2. voltage and current combined sensor according to claim 1, which is characterized in that the first conducting wire fixed mechanism
Specially：Rubber the first conducting wire fixed mechanism；
The second conducting wire fixed mechanism is specially：Rubber the second conducting wire fixed mechanism.
3. voltage and current combined sensor according to claim 1, which is characterized in that first iron core is specially：
Silicon steel sheet；
Second iron core is specially：Silicon steel sheet.
4. voltage and current combined sensor according to claim 1, which is characterized in that the fixing bracket is specially：
Polytetrafluoroethylene (PTFE) fixing bracket；
The movable support is specially：Polytetrafluoroethylene (PTFE) movable support.
5. voltage and current combined sensor according to claim 1, which is characterized in that the fixing bracket is specially：
Nylon plastic(s) fixing bracket；
The movable support is specially：Nylon plastic(s) movable support.
6. a kind of measure voltage ＆ current system, which is characterized in that including：Voltage check device, current sensing means and such as right
It is required that the voltage and current combined sensor described in 1-5 any one；
The voltage check device is connected with the voltage and current combined sensor, the current sensing means and the voltage
Current combined sensor is connected；
The voltage check device, the potential difference signal for being exported to the voltage and current combined sensor are handled,
Obtain the voltage of transmission line of electricity to be detected；
The voltage check device includes：First pre-differential amplifier circuit, the first bandwidth-limited circuit, the first programmable-gain
Amplifying circuit, the first A/D conversion circuits and first processor；
First pre-differential amplifier circuit, for filtering out the common mode interference signal in the potential difference signal, obtains first
Sub- potential difference signal；
First bandwidth-limited circuit for filtering out the high-frequency interferencing signal in the described first sub- potential difference signal, obtains
Two sub- potential difference signals；
First Programmable Gain Amplifier Circuit for being amplified to the described second sub- potential difference signal, obtains third
Potential difference signal；
The first A/D conversion circuits, for the sub- potential difference signal of the third to be converted to the first digital signal；
The first processor for first digital signal to be multiplied by predeterminated voltage proportionality coefficient, obtains described to be detected
The voltage of transmission line of electricity；
The current sensing means, at the induced electromotive force signal that is exported to the voltage and current combined sensor
Reason, obtains the electric current of the transmission line of electricity to be detected；
The current sensing means includes：Second pre-differential amplifier circuit, the second bandwidth-limited circuit, the second programmable-gain
Amplifying circuit, the 2nd A/D conversion circuits and second processor；
Second pre-differential amplifier circuit for filtering out the common mode interference signal in the induced electromotive force signal, obtains
First sub- induced electromotive force signal；
Second bandwidth-limited circuit for filtering out the high-frequency interferencing signal in the described first sub- induced electromotive force signal, obtains
To the second sub- induced electromotive force signal；
Second Programmable Gain Amplifier Circuit is amplified for induced electromotive force signal to described second, obtains
Three sub- induced electromotive force signals；
The 2nd A/D conversion circuits, for the sub- induced electromotive force signal of the third to be converted to the second digital signal；
The second processor for second digital signal to be multiplied by predetermined current proportionality coefficient, obtains described to be detected
The electric current of transmission line of electricity.
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| CN201510981010.2A CN105588976B (en) | 2015-12-23 | 2015-12-23 | Voltage and current combined sensor and measure voltage ＆ current system |
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| CN201510981010.2A CN105588976B (en) | 2015-12-23 | 2015-12-23 | Voltage and current combined sensor and measure voltage ＆ current system |
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| CN105588976B true CN105588976B (en) | 2018-07-03 |
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| CN107884615B (en) * | 2017-12-13 | 2023-11-14 | 湖南银河电气有限公司 | Integrated comprehensive tester for new energy automobile driving system |
| CN114720776A (en) * | 2022-04-06 | 2022-07-08 | 云南电网有限责任公司电力科学研究院 | Micro-nano sensing chip, electric field measurement system and method |
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| CN2929926Y (en) * | 2006-04-29 | 2007-08-01 | 特变电工康嘉(沈阳)互感器有限责任公司 | High voltage combined current and voltage mutual inductor |
| CN201655532U (en) * | 2009-12-18 | 2010-11-24 | 南阳中祥电力电子有限公司 | Electronic current-voltage combination transformer |
| CN102156218A (en) * | 2011-03-17 | 2011-08-17 | 重庆大学 | Device and method for measuring voltage of noncontact charge induced high-voltage transmission line |
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