CN110429565A - A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer - Google Patents
A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer Download PDFInfo
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- CN110429565A CN110429565A CN201910773888.5A CN201910773888A CN110429565A CN 110429565 A CN110429565 A CN 110429565A CN 201910773888 A CN201910773888 A CN 201910773888A CN 110429565 A CN110429565 A CN 110429565A
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- 239000003990 capacitor Substances 0.000 claims abstract description 66
- 230000003750 conditioning effect Effects 0.000 claims abstract description 10
- 230000007704 transition Effects 0.000 claims description 30
- 230000005611 electricity Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/425—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for voltage transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/05—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for capacitive voltage transformers, e.g. against resonant conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Filters And Equalizers (AREA)
Abstract
The present invention relates to a kind of protection circuits of capacitance-voltage-distributing type electronic type voltage transformer, including first order protection circuit and the second level to protect circuit, and the first order protects between circuit and second level protection circuit and is equipped with common mode choke；First order protection circuit includes varistor and gas-discharge tube, and varistor is connected in parallel on intermediate voltage capacitor both ends after connecting with gas-discharge tube, in intermediate voltage capacitor both ends parallel connection first resistor；It includes common mode protection circuit, differential mode protection circuit and low-pass filter circuit that circuit is protected in the second level, common mode protection circuit, differential mode protection circuit and low-pass filter circuit are connected with the both ends of common mode choke output end respectively, low-pass filter circuit is connected with amplifier, the output end connection signal conditioning circuit of amplifier.Protection circuit of the invention can improve the transient performance of capacitance type potential transformer, and avoid follow-up signal conditioning circuit from the influence of common-mode voltage.
Description
Technical field
The present invention relates to Intelligent transformer station technical field more particularly to a kind of capacitance-voltage-distributing type electronic type voltage transformers
Protection circuit.
Background technique
Capacitive divider is installed on high pressure primary equipment ontology.In operation, contact gap can generate high-tension switch gear
Strong arc phenomenon.Gap arcing is an extremely complex electric physical procedure, and bandwidth, ability be strong, form of diverse and not
Stablize.Uhf electromagnetic wave in this way is propagated in free space or different cavity, is reflected etc., and high frequency, high pressure are generated
Electromagnetic interference causes serious interference and influence to capacitive divider Signal sampling and processing.Therefore to have in signal port anti-
The treatment measures such as shield, filtering.
In capacitance-voltage-distributing type electronic type voltage transformer signal acquisition protection circuit, design scheme general at present is:
(1) varistor in parallel with intermediate voltage capacitor or transient voltage suppressor (abbreviation TVS) are arranged as signal port protection
It applies；(2) using Micro-Transformer of Voltage as the electrical isolation device between capacitive divider and signal acquiring system；(3) In
After isolating device, signal conditioning circuit directly is built with general-purpose operation amplifier.
Foregoing circuit is respectively present following corresponding drawback: (1) junction capacity of varistor or transition diode component is larger,
It is directly in parallel with intermediate voltage capacitor to will affect signal measurement precision generally in several hundred order of magnitude ranges to thousands of pF, increase leakage
Electric current；(2) Micro-Transformer of Voltage includes iron core, inhibits higher harmonic components, and introduces the phase for up to counting the radian order of magnitude
Potential difference；(3) Micro-Transformer of Voltage cannot inhibit or offset common-mode voltage, and general-purpose operation amplifier operation is in higher common-mode voltage
In the case of can damage device.
Summary of the invention
The present invention provides a kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer, can improve capacitor voltage
The transient performance of mutual inductor, and avoid follow-up signal conditioning circuit from the influence of common-mode voltage.
Particular content of the invention is as follows: a kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer, including the
Circuit is protected in primary protection circuit and the second level, grips between the first order protection circuit and second level protection circuit equipped with common mode
Stream circle；
The first order protection circuit includes varistor and gas-discharge tube, the varistor and gas-discharge tube string
Intermediate voltage capacitor both ends, medium pressure capacitor both ends parallel connection first resistor are connected in parallel on after connection；
Second level protection circuit includes common mode protection circuit, differential mode protection circuit and low-pass filter circuit, described total
Mould protection circuit, differential mode protection circuit and low-pass filter circuit are connected with the both ends of common mode choke output end respectively,
The low-pass filter circuit is connected with amplifier, the output end connection signal conditioning circuit of amplifier.
Further, the common mode protection circuit include the first transition diode and the second transition diode, described first
Transition diode and the second transition diode are separately connected both ends and the ground connection of common mode choke.
Further, the differential mode protection circuit includes third transition diode, the both ends of the third transition diode
It is connected respectively with the output end both ends of common mode choke.
Further, the low-pass filter circuit includes second resistance, 3rd resistor, first capacitor, the second capacitor and
Three capacitors, second resistance, the second capacitor and 3rd resistor, third capacitor respectively constitute common mode low-pass filter circuit, second resistance,
3rd resistor and first capacitor constitute differential mode low-pass filter circuit.
Further, the second resistance is arranged between common mode choke and first capacitor, the setting of second capacitor one end
Between second resistance and first capacitor, other end ground connection；3rd resistor setting common mode choke and first capacitor it
Between, third capacitor one end is arranged between 3rd resistor and first capacitor, other end ground connection.
Further, protection circuit is mounted at the port in voltage transformer signal acquisition circuit.
Further, HV Terminal, intermediate voltage terminal and ground terminal, intermediate voltage terminal and ground terminal are drawn on capacitive divider
Son is arranged on intermediate voltage capacitor, and the first order protects circuit to be arranged at intermediate voltage capacitor both ends.
Beneficial effects of the present invention: with such a structure, meet the precise measurement electricity under harsh electromagnetic interference environment
The requirement for holding voltage division signal, does not influence the precision of signal source (i.e. derided capacitors), improves the transitory of capacitance type potential transformer
Can, and avoid follow-up signal conditioning circuit from the influence of common-mode voltage.
Detailed description of the invention
A specific embodiment of the invention is furtherd elucidate with reference to the accompanying drawing.
Fig. 1 is the schematic diagram of the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer of the invention.
Specific embodiment
In conjunction with Fig. 1, present embodiment discloses a kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer, the protection
Circuit is mounted at the port in voltage transformer signal acquisition circuit.Capacitive divider is drawn HV Terminal, intermediate voltage terminal and is connect
Ground terminal, intermediate voltage terminal and ground terminal are arranged on intermediate voltage capacitor CL, and first order protection circuit is mounted on intermediate voltage capacitor
The both ends of CL.
Circuit and the second level is protected to protect circuit including the first order, the first order is protected between circuit and second level protection circuit
It is connected by common mode choke L.Common mode interference is isolated in the two of capacitive divider and signal processing circuit by common mode choke L
End cuts off common mode interference transmission channel between the two.With the increase of common mode interference frequency, the induction reactance of common mode choke L is linear
Increase, equivalent to increase the impedance of common mode interference transmission path, play the role of isolation, while it is anti-to realize front and back stages
Protect the cascade effect of device.
Wherein, first order protection circuit includes varistor MOV and gas-discharge tube GDT, and varistor MOV is put with gas
Fulgurite GDT is connected in parallel on the both ends intermediate voltage capacitor CL after being connected in series, in intermediate voltage capacitor CL both ends parallel connection first resistor R1, the first electricity
The resistance both ends R1 are separately connected two input terminals of common mode choke L, specifically, two input terminals of common mode choke L are also distinguished
Connect intermediate voltage terminal and ground terminal.
The junction capacity of varistor MOV is larger, generally several on the more than ten nF orders of magnitude.Varistor MOV is directly in parallel
It is equivalent in the side intermediate voltage capacitor CL and directly its junction capacitance is added in intermediate voltage capacitor CL value, to the essence of capacitive divider
Degree impacts.And the junction capacity of gas-discharge tube GDT is very small, generally within the scope of the order of magnitude of one or two of pF.By MOV and
Whole junction capacity after GDT series connection is the numerical value of GDT, will not influence the precision of voltage-dividing capacitor.Due to intermediate voltage capacitor CL
Partial pressure in the order of magnitude of several volts, therefore the clamping voltag of first order protective device is in tens voltage magnitudes under normal circumstances.
Capacitance type potential transformer can be significantly improved to the appropriate type selecting of first resistor R1 of intermediate voltage capacitor CL parallel connection
Transient performance.When open circuit or short trouble occurs in route, and loop voltage mutates, it is stored in the capacity of capacitive divider
It is released by first resistor R1 in parallel, to realize the quick response change to line voltage distribution and tracking measurement, is met
The transient characterisitics requirement of voltage transformer.
It includes the first transition diode TVS1, the second transition diode TVS2, two pole of third transition that circuit is protected in the second level
Pipe TVS3, second resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2, third capacitor C3 and high common-mode voltage are differential
Amplifier D1.
Common mode protection circuit includes the first transition diode TVS1 and the second transition diode TVS2, structure were the first winks
Become one of one end connection common mode choke L output end of diode TVS1, the other end ground connection of the first transition diode TVS1；
Second transition one end diode TVS2 connects another of common mode choke L output end, and the second transition diode TVS2's is another
End ground connection.
Differential mode protection circuit includes third transition diode TVS3, and specific structure is the two of third transition diode TVS3
End is connected with the output end both ends of common mode choke L respectively, and the first transition diode TVS1 and the second transition diode
TVS2 is arranged between common mode choke L and third transition diode TVS3.
First transition diode TVS1, the second transition diode TVS2 realize that the common mode of signal wire is protected, and third transition
Diode TVS3 realizes differential mode safeguard function.The supply voltage of subsequent differential amplifier D1 is in more than ten voltage amounts under normal circumstances
Grade, thus the clamping voltag of TVS pipe also takes more than ten volts, and is lower than the supply voltage of differential amplifier D1.
Low pass RC filter circuit includes second resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2 and third electricity
Hold C3, wherein second resistance, the second capacitor and 3rd resistor, third capacitor respectively constitute common mode low-pass filter circuit, the second electricity
Resistance, 3rd resistor and first capacitor constitute differential mode low-pass filter circuit.
Specifically, second resistance R2 is arranged between common mode choke L and first capacitor C1, the setting of second capacitor one end C2
Between second resistance R2 and first capacitor C1, other end ground connection；3rd resistor R3 is arranged in common mode choke L and first capacitor
Between C1, third one end capacitor C3 is arranged between 3rd resistor R3 and first capacitor C1, other end ground connection.And third transition
Diode TVS3, second resistance R2, first capacitor C1 and 3rd resistor R3 also form circuit.
Low pass R/C filters between before the high differential amplifier D1 of common-mode voltage and after L, mainly realize two functions:
(1) the differential amplifier D1 of high common-mode voltage has a stronger inhibition function to common mode interference in certain frequency range, thus D1 it
Before need to signal carry out inherently a kind of inductance component of bandwidth limitation (2) common mode choke L appropriate, need matching for capacitor
It closes, constituting LC filter circuit can be only achieved better filter effect.Second resistance R2 and 3rd resistor R3 are inserted in common mode choke L
Between first capacitor C1, the second capacitor C2 and third capacitor C3, inhibit the generation of LC resonance phenomenon.
The high differential amplifier D1 of common-mode voltage is four resistance classics differential amplifiers, can be in higher common-mode voltage, wider
Possess outstanding common-mode rejection ratio in frequency range, precise measurement can be carried out to differential input signal, and provide altogether input
Mould or differential mode overvoltage protection improve the functional reliability of follow-up signal conditioning circuit.
The present embodiment includes two-stage protection circuit, and two-stage protection circuit is together in series by common mode choke L；In middle piezoelectricity
The side container CL parallel resistance R1, improves the transient performance of capacitance type potential transformer；The differential amplifier D1 of high common-mode voltage is protected
It protects subsequent signal conditioning circuit and avoids damage device.The capacitance-voltage-distributing type electronic type voltage transformer signal of the present embodiment protects
Circuit meets the requirement of the precise measurement Capacitive Voltage Divider under harsh electromagnetic interference environment, does not influence signal source (i.e. partial pressure electricity
Hold) precision, improve the transient performance of capacitance type potential transformer, and avoid follow-up signal conditioning circuit from common-mode voltage
It influences.
Many details are elaborated in the above description to fully understand the present invention.But above description is only
Presently preferred embodiments of the present invention, the invention can be embodied in many other ways as described herein, therefore this
Invention is not limited by specific implementation disclosed above.Any those skilled in the art are not departing from the technology of the present invention simultaneously
In the case of aspects, all technical solution of the present invention is made using the methods and technical content of the disclosure above many possible
Changes and modifications or equivalent example modified to equivalent change.Anything that does not depart from the technical scheme of the invention, according to this
The technical spirit of invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within skill of the present invention
In the range of the protection of art scheme.
Claims (7)
1. a kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer, it is characterised in that: protect circuit including the first order
Circuit is protected with the second level, is equipped with common mode choke between the first order protection circuit and second level protection circuit；
The first order protection circuit includes varistor and gas-discharge tube, after the varistor is connected with gas-discharge tube
It is connected in parallel on intermediate voltage capacitor both ends, medium pressure capacitor both ends first resistor also in parallel；
Second level protection circuit includes common mode protection circuit, differential mode protection circuit and low-pass filter circuit, and the common mode is anti-
Protection circuit, differential mode protection circuit and low-pass filter circuit are connected with the both ends of common mode choke output end respectively,
The low-pass filter circuit is connected with amplifier, the output end connection signal conditioning circuit of amplifier.
2. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 1, it is characterised in that: described
Common mode protection circuit includes the first transition diode and the second transition diode, the first transition diode and the second transition two
Pole pipe is separately connected the both ends of common mode choke and ground connection.
3. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 1, it is characterised in that: described
Differential mode protection circuit includes third transition diode, the both ends of the third transition diode respectively with the output of common mode choke
Both ends are held to be connected.
4. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 3, it is characterised in that: described
Low-pass filter circuit includes second resistance, 3rd resistor, first capacitor, the second capacitor and third capacitor, second resistance, the second electricity
Hold and 3rd resistor, third capacitor respectively constitute common mode low-pass filter circuit, second resistance, 3rd resistor and first capacitor are constituted
Differential mode low-pass filter circuit.
5. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 4, it is characterised in that: described
Second resistance is arranged between common mode choke and first capacitor, the setting of second capacitor one end second resistance and first capacitor it
Between, other end ground connection；The 3rd resistor is arranged between common mode choke and first capacitor, and the setting of third capacitor one end is the
Between three resistance and first capacitor, other end ground connection.
6. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 1, it is characterised in that: protection
Circuit is mounted at the port in voltage transformer signal acquisition circuit.
7. the protection circuit of capacitance-voltage-distributing type electronic type voltage transformer according to claim 1, it is characterised in that: capacitor
HV Terminal, intermediate voltage terminal and ground terminal are drawn on divider, intermediate voltage terminal and ground terminal are arranged on intermediate voltage capacitor,
The first order protects circuit to be arranged at intermediate voltage capacitor both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910773888.5A CN110429565A (en) | 2019-08-21 | 2019-08-21 | A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910773888.5A CN110429565A (en) | 2019-08-21 | 2019-08-21 | A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer |
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|---|---|
| CN110429565A true CN110429565A (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910773888.5A Pending CN110429565A (en) | 2019-08-21 | 2019-08-21 | A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416272A (en) * | 2020-04-26 | 2020-07-14 | 中国科学院合肥物质科学研究院 | Trigger and protection circuit of excimer laser high-voltage switch |
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| CN201226292Y (en) * | 2008-03-24 | 2009-04-22 | 国网武汉高压研究院 | Electron type current transformer for ultrahigh voltage transmission line and apparatus for measuring corona loss thereof |
| CN102297730A (en) * | 2011-05-23 | 2011-12-28 | 国网电力科学研究院 | Multi-channel general temperature measurement module |
| CN202737456U (en) * | 2012-08-27 | 2013-02-13 | 海洋王（东莞）照明科技有限公司 | Surge protection circuit |
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