CN101788636B - Resonance voltage resistant test system and voltage resistant test method of sample with large capacitance - Google Patents
Resonance voltage resistant test system and voltage resistant test method of sample with large capacitance Download PDFInfo
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- CN101788636B CN101788636B CN200910312547A CN200910312547A CN101788636B CN 101788636 B CN101788636 B CN 101788636B CN 200910312547 A CN200910312547 A CN 200910312547A CN 200910312547 A CN200910312547 A CN 200910312547A CN 101788636 B CN101788636 B CN 101788636B
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Abstract
The invention discloses resonance voltage resistant test system and voltage resistant test method of a sample with large capacitance. A series compensation electric reactor group is dispersively distributed to form a mixed series and parallel connection structure so as to trend to a distribution parameter. The invention overcomes the defect of concentrated distribution of compensating inductances in the conventional series resonance voltage resistant method, enables a frequency converting power supply and a boosting transformer to just provide less power consumption, greatly improves the loading capacity of a frequency converting resonance voltage resistant device, realizes the scene alternating current voltage resistance of large and superlarge GISs, a long-distance power transmission high-voltage cable and a constant voltage transformer CVT with extremely high requirement on frequency, and can effectively prevent the capacitance improving effect caused by large capacitance and insulation damage caused by boosting of voltage between a tested sample clamping space and the tail end, and the more and more dispersive the compensation electric reactor group is, the better the effect is.
Description
Technical field
The present invention relates to a kind of high pressure withstand voltage test method, be particularly useful for the high-potting method of GIS (gas-insulated metal enclosed switch equipment), cable, CVT big electric capacity test products such as (capacitance type potential transformers).
Background technology
By regulation; GIS, cable, CVT are after preceding, the overhaul of putting into operation and behind the insulation fault; For whether the check primary element exists insulation defect; Whether dielectric level meets the requirement of regulation and producer's technical conditions of related standards, must carry out on-the-spot AC voltage withstand test, finds to make, transports, installs and overhaul the insulation defect of technology timely and effectively.
The on-the-spot AC voltage withstand test of the test product of high capacity, high tension voltage all adopts converter plant as experiment power supply at present.Great development along with China's electric utility; Generating plant, transformer station, city transmission line of electricity adopt the high-tension apparatus of increasing electric capacity; Present domestic 500kV electric pressure; Maximum GIS monomer electric capacity has reached about 43000pF, and the longest cable has reached about 333000pF, and CVT electric capacity monomer is about 15000pF.
The mode of connection of traditional pilot system is as shown in Figure 1; Variable-frequency power sources 1 is connected with the compensation reactor group 3 and the voltage divider 4 of step-up transformer 2, centralized arrangement; The test specimen 5 of centralized arrangement is parallelly connected with voltage divider 4; Variable-frequency power sources 1 is connected with control box 6 through control line, and control box 6 is connected with voltage divider photoelectronic coupler 7, low-voltage arm 8 through the voltage divider connecting line successively, and low-voltage arm 8 is connected with voltage divider 4 through concentric cable.
Traditional resonance pressure-resistant mode is thought of as lumped parameter with it, and the series compensation reactor group is centralized arrangement also, makes all active currents of loop, reactive current all through step-up transformer, and variable-frequency power sources must provide all active power and reactive power.At present; For the on-the-spot AC voltage withstand test of the test specimen of high capacitance; Receive the restriction of variable-frequency power sources and step-up transformer power in the resonant tank, have to adopt the segmentation pressurization or reduce the compromise means of trial voltage, both caused test specimen withstand voltage repeatedly; Reduce its dielectric level, can not satisfy the national standard requirement.
Its weak point is:
1, receive the restriction of manufacturing process and Development of Power Electronic Technology level, the about 500kVA of variable-frequency power sources peak power output is so the step-up transformer peak power output that is complementary with it also is no more than 500kVA;
2, the variable-frequency power sources frequency range is 30Hz～300Hz, and test specimen electric capacity C is big more, and resonance frequency f is low more, and test loop mesohigh electric current I is big more;
3, quality factor Q value receives the influence of the real component R in the resonant tank in the resonant tank, and the principal ingredient of R is the resistance of series compensation reactor group; Limited by reactor volume and cost; And the influence of on-the-spot active loss; Can not infinitely reduce R to improve its Q value, so step-up transformer output voltage E can not be too low, generally; Be step-up transformer output voltage minimum requirements=20kV, 220kV electric pressure requirement=10kV for the test of 500kV electric pressure test product;
So 4, the maximum output current I of step-up transformer is common=25A under the prior art condition, and for the high capacitance test, I can reach more than the 50A, so can not satisfy testing requirements.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of sample with large capacitance resonance pressure-resistant pilot system and withstand voltage test method, improved the frequency conversion resonance vibration pressure-proof load ability of laser facility.
Technical scheme of the present invention is: a kind of sample with large capacitance resonance pressure-resistant pilot system; Comprise variable-frequency power sources; Variable-frequency power sources is connected with step-up transformer; Said step-up transformer is connected with single group compensation reactor, voltage divider successively, and the test specimen of segmentation, at least one group of compensation reactor are parallelly connected with voltage divider.
The invention also discloses a kind of method of utilizing said sample with large capacitance resonance pressure-resistant pilot system to carry out withstand voltage test, comprise the steps:
The first step is collected the test specimen technical parameter, like device space arrangenent diagram, Insulation Coordination level, each unit piece electric capacity etc.;
Second step; The test specimen electric capacity is decomposed into distribution parameter by lumped parameter: utilize the arrangenent diagram per unit electric capacity that provide or that survey of each electrical equipment or the capacitance per unit length amount of every section equipment; According to the partial differential of electric capacity, obtain the distribution parameter of electric capacity for spatial placement;
The 3rd step, the compensation point of the compensating inductance device group of confirming possibly to arrange the resonance pressure-resistant testing ground;
In the 4th step, set up test specimen and testing equipment physical model;
The 5th step, set up computer model based on physical model, on computer model, carry out inductance compensation point and compensation quantity optimization again;
In the 6th step, utilize ATPdraw software that each parameter of test specimen is carried out checking computations;
The 7th step is according to computer model and ATPdraw simulation result field-test.
Compared with prior art; Good effect of the present invention is: for satisfying high capacity, high voltage test specimen ac voltage withstanding needs, improve the weak point of compensating inductance centralized arrangement in traditional series resonance pressure-resistant method, improve the load capacity of frequency conversion pressure-resistant apparatus; Adopt the principle of perceptual idle component nearby based on the capacitive reactive power component; The distribution of series compensation reactor component is put, become the series and parallel structure of mixing, make it to level off to distribution parameter.Through changing the output frequency of variable-frequency power sources, for variable-frequency power sources and step-up transformer, quilt tries sample with large capacitance and compensation reactor and demonstrates near 0 idle state.Make variable-frequency power sources and step-up transformer that less meritorious consume only is provided, improve the frequency conversion resonance vibration pressure-proof load ability of laser facility greatly, make large-scale, super-huge GIS, long distance powedr transmission high-tension cable and the on-the-spot ac voltage withstanding of the high CVT of frequency requirement become possibility.Another advantage that the present invention brings is, clamp down on voltage on the test specimen space length tail end and raise and cause insulation damages " hold and rises effect " that can also effectively avoid being caused by high capacitance, and the compensating reactance group arranges manyly more that overstepping the bounds of propriety diffusing, effect is good more.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing.
Fig. 1 is the wiring schematic diagram of traditional experiment system;
Fig. 2 is a connection principle synoptic diagram of the present invention.
Embodiment
Disclosed all characteristics in this instructions, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in this instructions (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
As shown in Figure 2; A kind of sample with large capacitance resonance pressure-resistant pilot system: variable-frequency power sources 21 and step-up transformer 22, single group compensation reactor 23, voltage divider 24 are connected successively, and the test specimen of segmentation 25, two groups of compensation reactors are parallelly connected with voltage divider 24, by that analogy; Can also there be many group compensation reactors parallelly connected with voltage divider 24; And the group number of parallel connection is many more, overstepping the bounds of propriety loosing, and effect is good more; Variable-frequency power sources 21 is connected with control box 26 through control line, and control box 26 is connected with voltage divider photoelectronic coupler 27, low-voltage arm 28 through the voltage divider connecting line successively, and low-voltage arm 28 is connected with voltage divider 24 through concentric cable.
Since the electric capacity, the particularly electric capacity of high capacitance test specimen of test specimen basically by volume or length be distribution parameter, but not lumped parameter; Event is loose the compensation reactor component and is arranged in the test loop, makes the compensation reactor inductance also be tending towards distribution parameter, and perceptual idle component is provided; Balance out the capacitive reactive power component that high capacitance causes nearby, series resonant tank is changed into the series and parallel resonant tank, like this; Voltage when step-up transformer only provides withstand voltage test, under perfect condition, the step-up transformer output current will level off to 0; And frequency changing power device is only required active loss in the output loop also; And do not export reactive power, and improve the frequency conversion resonance vibration load ability of laser facility greatly, satisfy the needs of the on-the-spot AC voltage withstand test of sample with large capacitance.
A kind of method of utilizing sample with large capacitance resonance pressure-resistant pilot system to carry out withstand voltage test comprises the steps:
The first step is collected the test specimen technical parameter, like device space arrangenent diagram, Insulation Coordination level, each unit piece electric capacity etc.;
In second step, the test specimen electric capacity is decomposed into distribution parameter by lumped parameter:
Because the distributivity of circuit parameter; Be basic parameters such as each element electric capacity, resistance, inductance by space distribution in whole loop; Electric current with adjacent 2 in a flash is all inequality; Electric current in the distributed constant circuit is except being the function of time, or the function of volume coordinate, so parameter such as electric current of each element, voltage, active power, reactive power is also by space distribution.And lumped parameter is meant and regards electric capacity, resistance, inductance as concentrate in together element do not have spatial volume, representes with one or limited singly-terminal pair.
In fact the electric capacity of test product is a distribution parameter, and certain location is spatially arranged, and total electric capacity is the summation of each cell capacitance amount on the element.
The relation of electric capacity lumped parameter and distribution parameter is that the electric capacity distribution parameter is a lumped parameter for the integration of space variable; The electric capacity lumped parameter is distribution parameter for the partial differential of space variable.
In engineering, Design Institute goes out the arrangenent diagram of each electrical equipment, promptly per unit locus.Each equipment manufacturing can provide unit length (area) electric capacity of per unit electric capacity or every section equipment, if do not provide, field survey is also very convenient.Then, according to the partial differential of electric capacity, just obtain the distribution parameter of electric capacity for spatial placement.
Can use said method for GIS, cable, and for CVT (capacitance type potential transformer) be used to the single capacitor measuring or compensate, because of its electric capacity is very big, relative volume is very little must be as the equipment of single or a plurality of (limited) lumped parameter.
The 3rd step, the compensation point of the compensating inductance device group of confirming possibly to arrange the resonance pressure-resistant testing ground;
In the 4th step, set up test specimen and testing equipment physical model;
The 5th step, set up computer model based on physical model, on computer model, carry out inductance compensation point and the optimization of benefit amount again;
The 6th step, utilize ATPdraw software (transient volume simulation trial) that each parameter of test specimen is carried out checking computations, if unreasonable parameter is arranged, turned back to for the 4th step to rebulid physical model;
The 7th step is according to computer model and ATPdraw simulation result field-test.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (2)
1. method of utilizing sample with large capacitance resonance pressure-resistant pilot system to carry out withstand voltage test; Said sample with large capacitance resonance pressure-resistant pilot system; Comprise variable-frequency power sources; Said variable-frequency power sources is connected with step-up transformer, and said step-up transformer is connected with single group compensation reactor, voltage divider successively, and the test specimen of segmentation, at least one group of compensation reactor are parallelly connected with voltage divider; It is characterized in that: comprise the steps:
The first step is collected the test specimen technical parameter, comprises device space arrangenent diagram, Insulation Coordination level and each unit piece electric capacity;
Second step; The test specimen electric capacity is decomposed into distribution parameter by lumped parameter: utilize the arrangenent diagram per unit electric capacity that provide or that survey of each electrical equipment or the capacitance per unit length amount of every section equipment; According to the partial differential of electric capacity, obtain the distribution parameter of electric capacity for spatial placement;
The 3rd step, the pressure point of the compensation reactor group of confirming possibly to arrange the resonance pressure-resistant testing ground;
In the 4th step, set up test specimen and testing equipment physical model;
The 5th step, set up computer model based on physical model, on computer model, carry out inductance compensation point and the optimization of benefit amount again;
In the 6th step, utilize ATPdraw software that each parameter of test specimen is carried out checking computations;
The 7th step is according to computer model and ATPdraw simulation result field-test.
2. the method for utilizing sample with large capacitance resonance pressure-resistant pilot system to carry out withstand voltage test according to claim 1 is characterized in that: after the checking computations through said the 6th step, if unreasonable parameter is arranged, then should turn back to for the 4th step to rebulid physical model.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102298109A (en) * | 2011-07-27 | 2011-12-28 | 华北电网有限公司唐山供电公司 | Determination method for circuit model for alternating-current voltage withstand test on power cable |
| CN102788890B (en) * | 2012-07-24 | 2013-09-18 | 苏州华电电气股份有限公司 | High-voltage variable-frequency resonance test device with voltage boosting and detecting tower-shared structure |
| CN104597363A (en) * | 2013-10-31 | 2015-05-06 | 南通富士特电力自动化有限公司 | Capacitor testing device and capacitor testing method |
| CN104808119B (en) * | 2015-03-31 | 2018-01-09 | 国网宁夏电力公司宁东供电公司 | 10kV cables ac voltage withstanding tests compensation scheme tester |
| CN106885972B (en) * | 2015-12-16 | 2019-12-03 | 中国二十冶集团有限公司 | Hv filtering compensation device entirety voltage-withstand test method |
| CN106959405B (en) * | 2017-03-08 | 2020-02-14 | 国网山东省电力公司电力科学研究院 | Method for calculating electric quantity and test capacity of extra-high voltage GIS main loop insulation test |
| CN107783016B (en) * | 2017-10-02 | 2019-11-05 | 国网山西省电力公司电力科学研究院 | Multiphase Parallel completes the measuring method of GIS pressure test before substation puts into operation |
| CN107728023B (en) * | 2017-10-27 | 2024-04-02 | 苏州华电电气股份有限公司 | Pressure measuring system for partial pressure of integrated series resonance inductance |
| CN109212389B (en) * | 2018-08-28 | 2020-12-29 | 中铁十二局集团有限公司 | Alternating current withstand voltage test method for high-capacity power equipment |
| CN109521339B (en) * | 2018-11-27 | 2021-08-17 | 山西浩宇龙晟电子科技有限公司 | Power frequency parallel resonance voltage withstand test method based on non-full compensation |
| CN112649730A (en) * | 2020-12-04 | 2021-04-13 | 国网新疆电力有限公司电力科学研究院 | Simulated load device and series resonance simulation test system based on same |
| CN113109684A (en) * | 2021-05-25 | 2021-07-13 | 西安热工研究院有限公司 | Large-scale steam turbine generator power frequency alternating current withstand voltage test device and method |
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Inventor after: Wang Xianxiu Inventor after: Zhu Tianyu Inventor after: Jiang Xuping Inventor after: Tan Ping Inventor after: Ding Tao Inventor after: Yang Guang Inventor before: Wang Xianxiu Inventor before: Wang Zhiyong Inventor before: Jiang Xuping Inventor before: Tan Ping Inventor before: Ding Tao Inventor before: Yang Guang |
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Free format text: CORRECT: INVENTOR; FROM: WANG XIANXIU WANG ZHIYONG JIANG XUPING TAN PING DING TAO YANG GUANG TO: WANG XIANXIU ZHU TIANYU JIANG XUPING TAN PING DING TAO YANG GUANG |
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