CN110320395A - On-line monitoring high-precision capacitance-resistance parallel voltage divider - Google Patents

On-line monitoring high-precision capacitance-resistance parallel voltage divider Download PDF

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Publication number
CN110320395A
CN110320395A CN201910574941.9A CN201910574941A CN110320395A CN 110320395 A CN110320395 A CN 110320395A CN 201910574941 A CN201910574941 A CN 201910574941A CN 110320395 A CN110320395 A CN 110320395A
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CN
China
Prior art keywords
resistance
capacitance
voltage
low
parallel
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Pending
Application number
CN201910574941.9A
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Chinese (zh)
Inventor
谢施君
丁卫东
梅锴盛
张榆
张晨萌
穆舟
曹树屏
王涵宇
向军
雷汉坤
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Priority to CN201910574941.9A priority Critical patent/CN110320395A/en
Publication of CN110320395A publication Critical patent/CN110320395A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/04Voltage dividers
    • G01R15/06Voltage dividers having reactive components, e.g. capacitive transformer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The present invention relates to power industry high-tension measurement fields, are related specifically to a kind of novel on-line monitoring high-precision capacitance-resistance parallel voltage divider.On-line monitoring high-precision capacitance-resistance parallel voltage divider, including pedestal, have been arranged vertically upwards composite insulator, composite insulator inner hollow, and be provided with high-voltage arm on the base;The upper end of the high-voltage arm is connected with the high-voltage connection terminal being arranged at the top of composite insulator, and lower end is connected with low-voltage arm, and is combined with shielding shell;Embedded with the output terminal being connect with low-voltage arm on the shielding shell.The present invention utilizes resistance capacitance voltage divider principle, the amplitude voltage signal for being difficult to measure is changed into the low amplitude value voltage signal convenient for observation, stray inductance can be reduced with the design of low pressure arm configuration to greatest extent by using a plurality of capacitance-resistance branch in parallel and choosing low sensing unit, measurement accuracy when measurement nanosecond Fast-Pulse Measuring can be improved, compensating unit is added between high-voltage arm and low-voltage arm, it can be with further expansion bandwidth.

Description

On-line monitoring high-precision capacitance-resistance parallel voltage divider
Technical field
The present invention relates to power industry high-tension measurement fields, are related specifically to a kind of novel on-line monitoring high-precision capacitance-resistance Parallel voltage divider.
Background technique
Transient overvoltage in substation/converter station seriously threatens the safety of high-tension electricity equipment and secondary device.According to Statistics, overvoltage are in space of top prominence in the inducement of electric power system fault.Transient overvoltage type in substation/converter station Very much, including lightning surge, switching overvoltage, power-frequency overvoltage, very fast transient overvoltage etc..When electric system power transmission and transformation When equipment or neighbouring object are by being struck by lightning, lightning surge can invade electric system directly or by induction;When in electric system Breaker and disconnecting switch are operated, or when failure, will appear various switching overvoltages in the power system;Work as electricity When Force system parameter configuration is improper or meets certain conditions, system is likely to occur resonance overvoltage;When gas-insulated metal-enclosed When disconnecting switch acts in formula combined electrical apparatus (Gas Insulated Switchgears, GIS), it is possible to inside GIS, outside On shell and adjacent power equipment formed very fast transient overvoltage (Very Fast Transient Over-voltage, VFTO).These overvoltage not only threaten the insulation safety of high voltage installation, also due to overvoltage is propagated to secondary device, Cause secondary equipment in power system failure, with the development of smart grid, GIS attached intelligent component is more and more, this It threatens increasingly severe.Transient overvoltage in electric system is monitored and is recorded, Electric Power Equipment Insulation is not only contributed to and matches It closes, has extremely important meaning to the safe and reliable operation for ensureing power equipment, also have product to the inhibition of overvoltage and protection The effect of pole.
Before this, operation power department, power equipment manufacturer and scientific research department are for substation/converter station transient state electricity Pressure detection and monitor log have carried out a large amount of research, develop the various transient voltage monitoring systems based on different principle, and Carry out in the power system on probation.But the transient voltage measuring system of different principle is in safety, measurement frequency bandwidth, environment Adaptability etc. respectively has advantage and disadvantage, it is difficult to carry out accurate evaluation.
Therefore, it needs to develop relevant detection device, school is carried out to the transient voltage measuring system frequency response in electric system It tests and assesses.This has vital effect to accuracy that is accurate, quickly and safely understanding transient voltage measured value, is A major issue of electric system Electric Measurement Technology at present.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of on-line monitoring high-precision capacitance-resistance parallel voltage divider, mention The high precision of transient voltage detection.
The present invention is achieved through the following technical solutions: on-line monitoring high-precision capacitance-resistance parallel voltage divider, including pedestal, It has been arranged vertically upwards composite insulator, the composite insulator inner hollow on the pedestal, and has been provided with high-voltage arm;It is described The upper end of high-voltage arm be connected with the high-voltage connection terminal being arranged at the top of composite insulator, lower end is connected with low-voltage arm, and matches Conjunction has shielding shell;Embedded with the output terminal being connect with low-voltage arm on the shielding shell.
Further, to better implement the present invention, especially using such as following settings: being filled out inside the composite insulator Dielectric filled with submergence high-voltage arm.
Further, to better implement the present invention, especially using such as following settings: the dielectric uses transformation Device oil.
Further, to better implement the present invention, especially using such as following settings: the low-voltage arm includes successively connecting The compensating unit and low sense PCB capacitance-resistance thin slice, the compensating unit connect is connect with high-voltage arm, and the low sense PCB capacitance-resistance is thin Piece is connect with the output terminal.
Further, to better implement the present invention, especially using such as following settings: the high-voltage arm includes support Frame, is connected with multiple capacitance-resistance branches from top to bottom on the support frame, and each capacitance-resistance branch includes the damping electricity being cascaded Resistance and high-voltage capacitance, each the capacitance-resistance branch and a parallel connection direct resistor coupled in parallel.
Further, to better implement the present invention, especially using such as following settings: capacitance-resistance branch as described in each and simultaneously A bucking electrode is connected after joining D.C. resistance parallel connection, and parallel connection direct resistance is placed in the center of the bucking electrode.
Further, to better implement the present invention, especially using such as following settings: the high-voltage capacitance uses low sense Ceramic condenser.
Further, to better implement the present invention, especially using such as following settings: the damping resistance and parallel connection is straight Leakage resistance is all made of low sense glaze resistance.
The present invention has the advantage that and the utility model has the advantages that the present invention is greatly reduced using measures such as low sensing units The stray inductance of equipment improves measurement accuracy of the invention.Improving survey in such a way that low-voltage arm increases compensating unit Measure result waveform, improve frequency bandwidth of the invention, can monitor on-line simultaneously express fast instantaneous voltage, lightning wave, operation wave, The multiple voltages signal such as power-frequency voltage and DC voltage.The present invention utilizes resistance capacitance voltage divider principle, it may be difficult to the high-amplitude of measurement Threshold voltage signal is changed into the low amplitude value voltage signal for being convenient for observation, and the damping resistance in every level-one high-voltage arm unit is to height The response of frequency voltage signal optimizes, and uses a plurality of capacitance-resistance branch in parallel and chooses low sensing unit with low-voltage arm PCB construction Design can reduce stray inductance to greatest extent, thus concussion problem when being obviously improved measurement high-frequency voltage signal.? Compensating unit is added between high-voltage arm and low-voltage arm, measurement nanosecond fast pulse letter can be improved with further expansion bandwidth Number when measurement accuracy.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application Point, do not constitute the restriction to the embodiment of the present invention.
Fig. 1 is a kind of structural schematic diagram that on-line monitoring of the invention uses high-precision capacitance-resistance parallel voltage divider;
Fig. 2 is the schematic cross-sectional view in Fig. 1 along A-A;
Fig. 3 is the circuit topological structure figure that on-line monitoring of the invention uses high-precision capacitance-resistance parallel voltage divider;
In figure, 1-grading ring, 2-high-voltage connection terminals, 3-composite insulators, 4-high-voltage arms, 5-dielectrics, 6-support frames, 7-bucking electrodes, 8-parallel connection direct resistance, 9-high-voltage capacitances, 10-damping resistances, 11-compensating units, 12-low-voltage arms, 13-low sense PCB capacitance-resistance thin slices, 14-metal shells, 15-output terminals, 16-pedestals.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made For limitation of the invention.
Embodiment:
As shown in Figure 1 to Figure 3, on-line monitoring of the invention high-precision capacitance-resistance parallel voltage divider, including pedestal 16, at this It has been arranged vertically upwards composite insulator 3,3 inner hollow of composite insulator on pedestal 16, and has been provided with high-voltage arm 4; The upper end of the high-voltage arm 4 is connected with the high-voltage connection terminal 2 that 3 top of composite insulator is arranged in, and lower end is connected with low pressure Arm 12, and it is combined with shielding shell 14;Embedded with the output terminal 15 being connect with low-voltage arm 12 on the shielding shell 14.
The present invention is greatly reduced the stray inductance of equipment, is improved survey of the invention using measures such as low sensing units Accuracy of measurement.Improving measurement result waveform, improving bandwidth of the invention in such a way that low-voltage arm increases compensating unit Degree can monitor the multiple voltages letters such as express fast instantaneous voltage, lightning wave, operation wave, power-frequency voltage and DC voltage on-line simultaneously Number.The present invention utilizes resistance capacitance voltage divider principle, it may be difficult to which the amplitude voltage signal of measurement is changed into convenient for observation by a narrow margin Threshold voltage signal, the damping resistance in every level-one high-voltage arm unit are optimized to the response to high-frequency voltage signal, are adopted Stray inductance can be reduced to greatest extent with the design of low pressure arm configuration with a plurality of capacitance-resistance branch in parallel and selection low sensing unit, from And it is obviously improved concussion problem when measuring high-frequency voltage signal.Compensating unit is added between high-voltage arm and low-voltage arm, it can With further expansion bandwidth, measurement accuracy when measurement nanosecond Fast-Pulse Measuring can be improved.
When specifically used, this patent equipment, first pedestal 16 are installed in substation, can be carried out by foundation bolt It is fixed, then the devices such as low-voltage arm 12, high-voltage arm 4 and composite insulator 3 are installed, be installed rear high-voltage connection terminal 2 with High-voltage end connection to be measured, it is real by 15 connecting detection equipment of output terminal after being depressured by devices such as high-voltage arm 4, low-voltage arms 12 Now detect.The amplitude voltage signal for being difficult to measure is changed into the low amplitude value voltage signal convenient for observation, every level-one high-voltage arm Damping resistance in unit is optimized to the response to high-frequency voltage signal, using a plurality of capacitance-resistance branch in parallel and selection Low sensing unit can reduce stray inductance with the design of low pressure arm configuration to greatest extent, to be obviously improved measurement high-frequency voltage Concussion problem when signal, improves detection accuracy.It is worth noting that, the detection device can be using oscillograph, record Wave instrument or other equipment.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the composite insulator 3 Dielectric 5 of the inside filled with submergence high-voltage arm 4, plays preferable insulating effect, reduces stray inductance, improve inspection Survey precision.The dielectric 5 generally uses transformer oil.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the low-voltage arm 12 includes Sequentially connected compensating unit 11 and low sense PCB capacitance-resistance thin slice 13, the compensating unit 11 is connect with high-voltage arm 4, described Low sense PCB capacitance-resistance thin slice 13 is connect with the output terminal 15.It is thin in high-voltage arm 4 and low sense PCB capacitance-resistance after designing in this way Compensating unit 11 is added between piece 13, can be with further expansion bandwidth, measurement essence when improving measurement nanosecond Fast-Pulse Measuring Degree.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the high-voltage arm 4 includes Support frame 6 is connected with multiple capacitance-resistance branches from top to bottom on the support frame 6, and each capacitance-resistance branch includes being cascaded Damping resistance 10 and high-voltage capacitance 9, each capacitance-resistance branch are in parallel with a parallel connection direct resistance 8.By capacitance-resistance branch, The effect of parallel connection direct resistance 8 etc., it may be difficult to the letter of threshold voltage by a narrow margin that the amplitude voltage signal of measurement is changed into convenient for observation Number, the damping resistance in every level-one capacitance-resistance branch is optimized to the response to high-frequency voltage signal, improves detection essence Degree.
Further, a bucking electrode 7 is connected after each capacitance-resistance branch is in parallel with parallel connection direct resistance 8, and Parallel connection direct resistance 8 is placed in the center of the bucking electrode 7, greatly reduces the stray inductance of equipment after design in this way, mentions High measurement accuracy of the invention.
Preferably, the high-voltage capacitance 9 uses low sense ceramic condenser to greatly reduce after designing in this way The stray inductance of equipment improves measurement accuracy of the invention.
Preferably, the damping resistance 10 and parallel connection direct resistance 8 is all made of low sense glaze resistance, set in this way After meter, the stray inductance of equipment is further reduced, improves measurement accuracy of the invention.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (8)

1. on-line monitoring high-precision capacitance-resistance parallel voltage divider, it is characterised in that: including pedestal (16), erected on the pedestal (16) It has directly set up composite insulator (3), the composite insulator (3) inner hollow, and has been provided with high-voltage arm (4);It is described The upper end of high-voltage arm (4) be connected with high-voltage connection terminal (2) at the top of composite insulator (3) be set, lower end is connected with low Pressure arm (12), and it is combined with shielding shell (14);Embedded with the output being connect with low-voltage arm (12) on the shielding shell (14) Terminal (15).
2. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 1, it is characterised in that: described is compound Dielectric (5) filled with submergence high-voltage arm (4) inside insulator (3).
3. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 2, it is characterised in that: the insulation Medium (5) uses transformer oil.
4. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 1, it is characterised in that: the low pressure Arm (12) includes sequentially connected compensating unit (11) and low sense PCB capacitance-resistance thin slice (13), the compensating unit (11) and high Pressure arm (4) connection, the low sense PCB capacitance-resistance thin slice (13) connect with the output terminal (15).
5. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 4, it is characterised in that: the high pressure Arm (4) includes support frame (6), is connected with multiple capacitance-resistance branches from top to bottom on the support frame (6), and each capacitance-resistance branch includes The damping resistance (10) and high-voltage capacitance (9) being cascaded, each the capacitance-resistance branch and a parallel connection direct resistance (8) It is in parallel.
6. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 5, it is characterised in that: described in each A bucking electrode (7) is connected after capacitance-resistance branch is in parallel with parallel connection direct resistance (8), and parallel connection direct resistance (8) is placed in the screen Cover the center of electrode (7).
7. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 6, it is characterised in that: the high pressure Capacitor (9) uses low sense ceramic condenser.
8. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 6, it is characterised in that: the damping Resistance (10) and parallel connection direct resistance (8) are all made of low sense glaze resistance.
CN201910574941.9A 2019-06-28 2019-06-28 On-line monitoring high-precision capacitance-resistance parallel voltage divider Pending CN110320395A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN113884739A (en) * 2021-08-20 2022-01-04 中国电力科学研究院有限公司 Broadband voltage divider device and scale factor calibration method
CN114509592A (en) * 2022-04-20 2022-05-17 山东泰开互感器有限公司 Capacitor voltage transformer with electric energy quality monitoring function
CN115480096A (en) * 2022-10-21 2022-12-16 国网四川省电力公司电力科学研究院 Electrical engineering broadband voltage online monitoring device with insulation gap and method
CN117706146A (en) * 2023-12-26 2024-03-15 江苏靖江互感器股份有限公司 Self-absorption overvoltage type direct-current distribution voltage sensor

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CN206618791U (en) * 2016-11-10 2017-11-07 许继电气股份有限公司 A kind of wide-band capacitor compensating formula resitstance voltage divider
CN207164120U (en) * 2017-09-11 2018-03-30 信电电器集团有限公司 Capacitance partial pressure electronic type voltage transformer with phase compensation device
CN109324216A (en) * 2018-11-13 2019-02-12 中国电力科学研究院有限公司 Low-voltage arm and transient voltage measuring device

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CN103323640A (en) * 2013-06-25 2013-09-25 中国西电电气股份有限公司 Extra-high-voltage direct-voltage voltage divider with heat dissipation device
DE102015106090A1 (en) * 2015-04-21 2016-10-27 Dipl.-Ing. H. Horstmann Gmbh Method and. Device for setting a capacitive voltage test system
CN206618791U (en) * 2016-11-10 2017-11-07 许继电气股份有限公司 A kind of wide-band capacitor compensating formula resitstance voltage divider
CN107179429A (en) * 2017-05-09 2017-09-19 西安交通大学 A kind of new capacitance-resistance parallel voltage divider
CN207164120U (en) * 2017-09-11 2018-03-30 信电电器集团有限公司 Capacitance partial pressure electronic type voltage transformer with phase compensation device
CN109324216A (en) * 2018-11-13 2019-02-12 中国电力科学研究院有限公司 Low-voltage arm and transient voltage measuring device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113884739A (en) * 2021-08-20 2022-01-04 中国电力科学研究院有限公司 Broadband voltage divider device and scale factor calibration method
CN113884739B (en) * 2021-08-20 2024-02-13 中国电力科学研究院有限公司 Broadband voltage divider device and scale factor calibration method
CN114509592A (en) * 2022-04-20 2022-05-17 山东泰开互感器有限公司 Capacitor voltage transformer with electric energy quality monitoring function
CN115480096A (en) * 2022-10-21 2022-12-16 国网四川省电力公司电力科学研究院 Electrical engineering broadband voltage online monitoring device with insulation gap and method
CN117706146A (en) * 2023-12-26 2024-03-15 江苏靖江互感器股份有限公司 Self-absorption overvoltage type direct-current distribution voltage sensor
CN117706146B (en) * 2023-12-26 2024-09-24 江苏靖江互感器股份有限公司 Self-absorption overvoltage type direct-current distribution voltage sensor

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Application publication date: 20191011