CN201926745U - Test circuit for asymmetric current breaking of million-voltage circuit breaker - Google Patents
Test circuit for asymmetric current breaking of million-voltage circuit breaker Download PDFInfo
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- CN201926745U CN201926745U CN2010206619794U CN201020661979U CN201926745U CN 201926745 U CN201926745 U CN 201926745U CN 2010206619794 U CN2010206619794 U CN 2010206619794U CN 201020661979 U CN201020661979 U CN 201020661979U CN 201926745 U CN201926745 U CN 201926745U
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Abstract
The utility model relates to a test circuit for asymmetric current breaking of a million-voltage circuit breaker, and the test circuit comprises a parallel-current injection circuit. The test circuit is characterized in that a power-frequency oscillation circuit taken as a current compensation circuit is added in the parallel-current injection circuit and is isolated from the main circuit through an auxiliary switch. The test circuit for asymmetric current breaking of the million-voltage circuit breaker can completely meet the standard requirements for transient recovery voltage (TRV) and power-frequency recovery voltage, and can provide a high half-wave current required for the standard when the time constant of the circuit breaker is larger than the system time constant of the testing laboratory and the rated breaking capacity of the circuit breaker is higher than the maximum testing capacity of the testing laboratory.
Description
Technical field
The utility model belongs to the circuit-breaker testing technical field, relates to a kind of circuit-breaker testing loop, especially a kind ofly is used for the test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off.
Background technology
In the various short troubles of electric system, short-circuit current often includes aperiodic component.Contain break performance existence in various degree the influence of the asymmetrical current of different aperiodic components to system break road device, particularly work as the big and higher isolating switch of rated voltage of asymmetric degree, its influence is more remarkable.For the examination isolating switch cut-offs the ability that contains the aperiodic component short-circuit current, " IEC 62271-100:2008 high-tension switch gear and the opertaing device " standard code of etc.ing asymmetrical current cut-off and test T100a.
For the T100a test of electric pressure lower (800kV and following), domestic existing research document is mentioned at present, as " asymmetrical current cut-offs the test condition and the test loop of synthetic test ", author Wu Shenggang, periodical name " high tension voltage " 1995,31 (6) ,-22-28.The difficult problem that satisfies of power-frequency voltage when this document design adopts new loop solution asymmetrical current to cut-off test, two kinds of test loops addressing in the literary composition are only applicable to the asymmetrical current test of the not high isolating switch of electric pressure.
Along with the increase of power system capacity,, do not have suitable loop can satisfy its asymmetrical current at present and cut-off test for the UHV transmission loop isolating switch of electric pressure 1100kV, rated short circuit current 63kA, time constant 120ms.
Owing to asymmetrical current cut-offs the test existing problems, carried out the research of this test synthetic method both at home and abroad, and proposed some improved test loops, but the synthetic test loop that the suitable asymmetrical current of neither one cut-offs drops into the report of industrialization operation.Modeling analysis is carried out in these loops, and in conjunction with testing laboratory's actual conditions, the reference standard parameter is determined the feasibility in these loops and the problem of existence.This part has been carried out sunykatuib analysis to three kinds of loops mentioning in the present document, comprise that the asymmetric synthetic test circuit that applies the AC power frequency recovery voltage, the asymmetrical current that series compensation is arranged cut-off synthetic test circuit, asymmetrical current test loop, testing station, ABB Baden, these loops all come with some shortcomings, be mainly: when (1) carries out the asymmetrical current test of high pressure, breaker in extra high voltage, can't satisfy the TRV and the power frequency recovery voltage of standard-required simultaneously; (2) when the time constant of isolating switch is cut-off capacity and is higher than the maximum test capacity of testing laboratory greater than testing laboratory's system time constant and its are specified, can't provide the major loop electric current of standard-required.
The utility model content
The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, a kind of test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off that is used for is provided, for 1100kV 63kA 120ms isolating switch provides a kind of test loop of realizing the examination of asymmetrical current connecting-disconnecting function, this loop has equivalence, exploitativeness and high efficiency preferably.
The purpose of this utility model solves by the following technical programs:
This being used for comprises parallel-current introducing loop in the test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off, and it is characterized in that: introducing in parallel-current increases by a cover oscillation frequency loop as the current compensation loop in the loop, with auxiliary switch and major loop isolation.
Above-mentioned oscillation frequency loop comprises second electric capacity, second protective device and second inductance, and described second electric capacity, second protective device and second inductance are connected the back successively by in the described auxiliary switch access parallel-current introducing loop.
The utlity model has following beneficial effect:
The utility model is used for TRV and the power frequency recovery voltage that test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off is satisfied standard-required fully, and when the time constant of isolating switch is cut-off capacity and is higher than the maximum test capacity of testing laboratory greater than testing laboratory's system time constant and its are specified, can provide the major loop electric current of standard-required.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is a current compensation principle schematic of the present utility model.
Wherein: BD: protection switch; HK: combined floodgate switch; CD: operating switch; L1: regulate reactor; Cs1-DQ1-LS1: voltage circuit; Cs2-DQ2-Ls2: current compensation loop; TB: tested isolating switch; AB1: auxiliary switch; AB2: auxiliary switch; I: total current; I1: dynamo current; I2: current return electric current; I3: offset current.
Embodiment
The calculating of the last half-wave area of asymmetrical current:
According to the regulation of standard, the asymmetrical current test has three criterions: the amplitude of last electric current half-wave; The duration of last electric current half-wave; The DC component percentage of current zero.1,000,000 volts of isolating switchs are implemented asymmetrical current cut-off test, the loop basic framework of employing is the synthetic test loop that parallel-current is introduced, and the utility model is the improvement (seeing accompanying drawing 6) on this frame foundation.For synthetic test loop, the asymmetric level of current zero is determined by high tension loop, so current compensation only need satisfy preceding two criterions.Explanation in " IEC 62271-308 ": the margin tolerance that the peak value short-circuit current of the last half-wave before the permission short-circuit current cut-offs and short-circuit current duration each have required value ± 10%, when if the tolerance of current amplitude can not satisfy, as long as the duration of the last electric current half-wave before cut-offfing required value 90% and 110% between, product
Required value 81% and 121% between get final product.Here
Be the peak value of last electric current half-wave requirement, " Δ t " is the duration of last electric current half-wave requirement.To the product of mentioning in the standard
Carry out computational analysis with the relation of electric current half-wave area, think to be actually, just the regulation of electric current area the injection current energy.
The parallel-current of belt current compensation is introduced synthetic test loop
According to the analytical calculation of above-mentioned part, based on the situation of testing laboratory's existing equipment, the parallel-current introducing synthetic test loop that proposes the belt current compensation carries out the test of cut-offfing of asymmetrical current, solves the problem that last electric current half-wave injects energy shortage.When cut-offfing, utilize oscillation circuit to produce a power frequency offset current half-wave as requested at the test major loop, the last half-wave of generator system electric current is carried out the area compensation to satisfy standard-required.Current compensation test loop schematic diagram is seen Fig. 1, and the current compensation principle schematic is seen Fig. 2.
Concrete, the utility model comprises parallel-current introducing loop, introducing in parallel-current increases by a cover oscillation frequency loop as the current compensation loop in the loop, use auxiliary switch AB
2Isolate with major loop.Below to circuit theory of the present utility model being done labor in conjunction with Fig. 6:
Referring to Fig. 1; the voltage circuit that comprises protection switch BD, combined floodgate switch HK, operating switch CD in the circuit of the present utility model, regulates reactor L1, constitutes by Cs1-DQ1-LS1, by the Cs2-DQ2-Ls2 series circuit as current compensation loop, tested isolating switch TB, 550kV auxiliary switch AB1,252kV auxiliary switch AB2 etc., I is that total current, I1 are that dynamo current, I2 are that current return electric current, I3 are offset current.
Being connected to of oscillation frequency loop: at first this loop comprises the second capacitor C s2, the second protective device DQ2 and the second inductance L s2.Wherein the second capacitor C s2, the second protective device DQ2 and the second inductance L s2 connect the back successively by in the auxiliary switch AB2 access parallel-current introducing loop.
The course of work of the present utility model is as follows:
Introduce in the loop in parallel-current, increase by a cover oscillation frequency loop Cs2-DQ2-Ls2, isolate with auxiliary switch AB2 and major loop as the current compensation loop.At the leading zero's of last electric current half-wave of dynamo current, make the DQ2 action, introduce offset current and superpose with generator G electric current, make the electric current half-wave total area after the stack be not less than the half-wave area of requirement.At same zero point, prolong the arc loop and drop into, allow short-circuit current locate quick zero passage at this zero point, guarantee that tested switch can not shift to an earlier date blow-out.The current over-zero first few hundred microsecond of closing in the tested disconnection of flowing through is (according to standard, be generally about 400 μ s), make the DQ1 action, tested switch TB is flow through in the common stack of I2 and I1, I3, and I1 and I3 superimposed current flow through auxiliary switch AB1, and auxiliary switch cut-offs when flowing through self current over-zero, after this tested switch only flows through the electric current that the Cs1-DQ1-Ls1 loop produces, and cut-off in the blow-out constantly of its zero passage, bear the recovery voltage that Cs1-DQ1-Ls1 produces by the vibration of frequency modulation branch road, i.e. Yu Qi TRV.
During concrete the test, the electric current area compensation that needs make needs is earlier calculated, and determines the difference of peak value and the duration and the required value of the last half-wave of dynamo current, determines the parameter value in current compensation loop then according to result of calculation.
Claims (2)
1. one kind is used for the test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off, comprise parallel-current introducing loop, it is characterized in that: introducing in parallel-current increases by a cover oscillation frequency loop (Cs2-DQ2-Ls2) as the current compensation loop in the loop, with auxiliary switch (AB
2) isolate with major loop.
2. according to claim 1 being used for is characterized in that the test loop that 1,000,000 volts of isolating switch asymmetrical currents cut-off: described oscillation frequency loop comprises second electric capacity (Cs2), second protective device (DQ2) and second inductance (Ls2); Described second electric capacity (Cs2), second protective device (DQ2) and second inductance (Ls2) are connected the back successively by in described auxiliary switch (AB2) the access parallel-current introducing loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206619794U CN201926745U (en) | 2010-12-15 | 2010-12-15 | Test circuit for asymmetric current breaking of million-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206619794U CN201926745U (en) | 2010-12-15 | 2010-12-15 | Test circuit for asymmetric current breaking of million-voltage circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN201926745U true CN201926745U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206619794U Expired - Lifetime CN201926745U (en) | 2010-12-15 | 2010-12-15 | Test circuit for asymmetric current breaking of million-voltage circuit breaker |
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| Country | Link |
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| CN (1) | CN201926745U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490286A (en) * | 2018-03-06 | 2018-09-04 | 沈阳变压器研究院股份有限公司 | The compensation method of asymmetrical current and device in heavy current test |
| CN114325360A (en) * | 2020-10-10 | 2022-04-12 | 西安高压电器研究院股份有限公司 | Short circuit on-off test method and system for high-voltage alternating current circuit breaker |
-
2010
- 2010-12-15 CN CN2010206619794U patent/CN201926745U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490286A (en) * | 2018-03-06 | 2018-09-04 | 沈阳变压器研究院股份有限公司 | The compensation method of asymmetrical current and device in heavy current test |
| CN114325360A (en) * | 2020-10-10 | 2022-04-12 | 西安高压电器研究院股份有限公司 | Short circuit on-off test method and system for high-voltage alternating current circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110810 |
|
| CX01 | Expiry of patent term |