CN102749559B - VFTO (Very Fast Transient Overvoltage) online measurement and alarm system for electric power - Google Patents

VFTO (Very Fast Transient Overvoltage) online measurement and alarm system for electric power Download PDF

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Publication number
CN102749559B
CN102749559B CN201210235455.2A CN201210235455A CN102749559B CN 102749559 B CN102749559 B CN 102749559B CN 201210235455 A CN201210235455 A CN 201210235455A CN 102749559 B CN102749559 B CN 102749559B
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vfto
crown
measurement
voltage arm
alarm
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CN102749559A (en
Inventor
谭向宇
杨卓
张恭源
王达达
王科
赵现平
彭晶
马仪
陈磊
徐肖伟
刘红文
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Abstract

The invention discloses a VFTO (Very Fast Transient Overvoltage) online measurement and alarm system for electric power. The VFTO online measurement and alarm system consists of a capacitive voltage divider (1) and a VFTO waveform acquisition system (2). The VFTO online measurement and alarm system disclosed by the invention realizes online real-time measurement of VFTO and has the obvious advantages of wide measurement bandwidth and improvement of early safety warning and the like.

Description

A kind of electric power VFTO on-line measurement and warning system
Technical field
The present invention relates to a kind of GIS class electrical equipment fast transient overvoltage line Measurement Technique field.
Background technology
Gas insulated combined electrical equipment (GIS, Gas Insulated Switchgear) is due to its safety, and the feature running enclosed construction reliably makes operations staff avoid contacting with live components; On bus and the integrated insulation switch of outgoing line side and grounding switch ensure that the security of equipment blocking and ground unit, Dynamic System is Long-distance Control all, and outgoing line side also can be that high speed grounding switch carrys out alternative mobile grounding rod and is grounded; Blow-out disc with direct pressure releasing means can prevent the pressure exceeding regulation in housing from raising; All modular units, on a surface level, make whole arrangement simple for structure, clear, are therefore widely used in electric system.
Affect amplitude voltage wave mainly lightning wave, operation ripple and the VFTO ripple (Very Fast Transient Overvoltage, fast transient overvoltage) of this combined electric appliance equipment.Long-term by one, lightning wave is continued to use for a long time as the apparatus insulated Selection parameter of GIS electric appliances, but is filled with anticyclonic SF due to GIS inside 6gas, is different from other insulator, SF 6the Overvoltage Amplitude that gas interior produces is relatively high, and rising edge is very fast, usually reaches tens of ns, even reaches several ns.This transient overvoltage fast, frequency is corresponding very fast, and high frequency response directly causes low electric capacity electrical equipment directly can accessiblely to pass through, electrical equipment every meter about 50pF in GIS simultaneously, its electric capacity is relatively less, and thus, VFTO ripple makes insulation of electrical installation intensity reduce.SF simultaneously 6outlet openings intensity is high, and it is comparatively serious that VFTO waveguide causes supporting insulator edge flashing problem.Thus, the device in the urgent need to providing one can measure this fast transient overvoltage (VFTO ripple) in time.
The present invention designs one can be installed on GIS, combines together with GIS, measures and the device of the on-line measurement VFTO ripple of display alarm.
Summary of the invention
The object of the invention is to solve does not have a kind ofly to measure in time and produce the problem of VFTO ripple in electrical production reality of reporting to the police at present, proposes a kind of capacitive divider and impedance transducer of utilizing in interior VFTO ripple warning system.
The present invention is realized by following technical proposal.A kind of electric power VFTO on-line measurement and warning system, feature of the present invention is: VFTO measuring system is connected and composed by capacitive divider and VFTO Waveshape Collecting System; Wherein:
Capacitive divider comprises high-voltage arm and low-voltage arm, high-voltage arm is combined by top crown and high-pressure conductor, low-voltage arm is by the lower surface of top crown, the upper surface composition of ceramic condenser and bottom crown, the outward flange of top crown extends to GIS radius level height, high-voltage connection is directly connected with top crown, this lead-in wire by epoxy resin sealing in housing shroud;
VFTO Waveshape Collecting System is by impedance transformer, attenuator, preposition measuring resistance, preposition measurement electric capacity, rearmounted measurement electric capacity, rearmounted measuring resistance is connected to form by cable, and display terminal is received cable transmission signal and reported to the police, and reports to the police simultaneously by wireless signal transmitting device transmission of electromagnetic signals, radio receiver receives this alerting signal and starts electromagnet magnet ring, for suppressing VFTO ripple for the impact of Transformer Winding.
Content of the present invention is further illustrated below in conjunction with accompanying drawing and example.
Accompanying drawing explanation
Fig. 1 is VFTO on-line measurement system schematic diagram;
Fig. 2 is the enlarged drawing at A place of the present invention.
Embodiment
A kind of electric power VFTO on-line measurement and warning system, feature of the present invention is: VFTO measuring system is connected and composed by capacitive divider 1 and VFTO Waveshape Collecting System 2; Wherein:
Capacitive divider 1 comprises high-voltage arm and low-voltage arm, high-voltage arm is combined by top crown 8 and high-pressure conductor 6, low-voltage arm is by the lower surface of top crown, the upper surface composition of ceramic condenser 9 and bottom crown, the outward flange of top crown extends to GIS radius level height 23, high-voltage connection is directly connected with top crown 8, this lead-in wire by epoxy resin 11 sealing in housing shroud 10;
VFTO Waveshape Collecting System 2 is by impedance transformer 13, attenuator 14, preposition measuring resistance 15, preposition measurement electric capacity 16, rearmounted measurement electric capacity 17, rearmounted measuring resistance 18 is connected to form by cable 20, and display terminal 21 is received cable transmission signal and reported to the police, and reports to the police simultaneously by wireless signal transmitting device 26 transmission of electromagnetic signals, radio receiver 25 receives this alerting signal and starts electromagnet magnet ring 24, for suppressing VFTO ripple for the impact of transformer 3 winding.
As shown in Figure 1, it gives VFTO on-line measurement system schematic diagram.The a series of measurement mechanisms of VFTO ripple through capacitive divider 1 are shown in figure.Due to VFTO ripple major effect winding electric appliances equipment etc., when disconnector 7 action, probably will produce VFTO ripple in loop, now adopt the high-voltage arm of capacitive divider 1 this VFTO to be carried out coupling measurement, high voltage arm capacitor amount is generally 0.5-1pF.Because its amplitude is relatively high, thus two-stage dividing potential drop is adopted, further by low-voltage arm, high-voltage arm measuring voltage is reduced, the ceramic dielectric films of bulky capacitor is filled with between top crown 8 and bottom crown 22, be used for increasing electric capacity and be generally 2-10nF, produce higher intrinsic standoff ratio, because top crown 8 and high-pressure conductor 6 form electric capacity and are generally 20PF, if the amplitude that low-voltage arm is measured is still very high, us are then needed to be decayed further by this signal by attenuator 14, and then by follow-up preposition measuring resistance 15, preposition measurement electric capacity 16, rearmounted measurement electric capacity 17 and rearmounted measuring resistance 18 carry out signal capture, and then push to Signal aspects terminal 21, preposition measuring resistance 15 is generally 2 Ω-50 Ω, preposition measurement electric capacity 16 is generally 1nF-10nF, rearmounted measuring resistance 17 is generally 1 Ω-50 Ω, rearmounted measurement electric capacity 18 is generally 1nF-10nF, after measuring system obtains amplitude VFTO ripple, Signal aspects terminal 21 sends alerting signal by wireless signal transmitting device 26, and this signal is obtained by radio receiver 25, starts electromagnet magnet ring 24, for suppressing the harm of VFTO ripple simultaneously.

Claims (1)

1. electric power VFTO on-line measurement and a warning system, VFTO measuring system is connected and composed by capacitive divider (1) and VFTO Waveshape Collecting System (2); Wherein: capacitive divider (1) comprises high-voltage arm and low-voltage arm, high-voltage arm is combined by top crown (8) and high-pressure conductor (6), low-voltage arm is by the lower surface of top crown, the upper surface composition of ceramic condenser (9) and bottom crown (22), it is characterized in that: the outward flange of top crown (8) extends to GIS radius level height (23), high-voltage connection is directly connected with top crown (8), this lead-in wire by epoxy resin (11) sealing in housing shroud (10); VFTO Waveshape Collecting System (2) is by impedance transformer (13), attenuator (14), preposition measuring resistance (15), preposition measurement electric capacity (16), rearmounted measurement electric capacity (17), rearmounted measuring resistance (18) is connected to form by cable (20), display terminal (21) is received cable transmission signal and is reported to the police, report to the police simultaneously by wireless signal transmitting device (26) transmission of electromagnetic signals, radio receiver (25) receives this alerting signal and starts electromagnet magnet ring (24), for suppressing VFTO ripple for the impact of transformer (3) winding.
CN201210235455.2A 2012-07-09 2012-07-09 VFTO (Very Fast Transient Overvoltage) online measurement and alarm system for electric power Active CN102749559B (en)

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Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
CN103217659B (en) * 2013-04-17 2015-06-03 清华大学 Calibration method and calibration device of very fast transient overvoltage measuring system
CN103941166B (en) * 2014-04-23 2016-07-06 沈阳工业大学 High-temperature gas breakdown characteristics detecting device and method under a kind of VFTO
CN106505457B (en) * 2016-11-21 2019-07-05 云南电网有限责任公司电力科学研究院 A kind of nanocrystalline magnetic loop device
CN108535618A (en) * 2018-07-11 2018-09-14 云南电网有限责任公司电力科学研究院 A kind of GIS method for detecting insulation defect
CN109239447A (en) * 2018-08-21 2019-01-18 上海赛璞乐电力科技有限公司 A kind of power distribution network transient overvoltage monitoring system
CN110618363A (en) * 2019-11-01 2019-12-27 云南电网有限责任公司电力科学研究院 GIS/GIL insulation flashover voltage waveform measuring platform
CN110687415A (en) * 2019-11-11 2020-01-14 云南电网有限责任公司电力科学研究院 GIS/GIL insulation flashover waveform detection system

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