CN106526471A - Calculation method of back two-pole current parameter under asymmetric fault condition - Google Patents

Calculation method of back two-pole current parameter under asymmetric fault condition Download PDF

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Publication number
CN106526471A
CN106526471A CN201610971449.1A CN201610971449A CN106526471A CN 106526471 A CN106526471 A CN 106526471A CN 201610971449 A CN201610971449 A CN 201610971449A CN 106526471 A CN106526471 A CN 106526471A
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current
component
phase
open
short circuit
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CN106526471B (en
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董玮
刘浩军
高享想
胡勋
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Xi'an High Voltage Apparatus Research Institute Changzhou Co., Ltd
Xi'an High Voltage Electrical Apparatus Research Institute Co.,Ltd.
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China XD Electric Co Ltd
Xian High Voltage Apparatus Research Institute Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices

Abstract

The present invention provides a calculation method of a back-open two-pole current parameter under an asymmetric fault condition, and a problem that the back-open two-pole current parameter can not be obtained through calculation is obtained. The method comprises the steps of (1) obtaining each phase current which passes a circuit breaker before first-open phase crossing zero time t0 when a three-phase short circuit fault happens, (2) carrying out independent vector operation of an AC component and a DC component of the back-open two-pole current after the first-open phase crossing zero time t0, and obtaining corresponding expressions. (3) stacking the estimated AC component and the DC component, and obtaining the back-open two-pole current parameter. According to the method, the obtained back-open two-pole current expressions are suitable for a neutral point effective grounding system and a neutral point non-effective grounding system, after the vector calculation of the AC component and the DC component, the AC component in the vector diagram obtained by a symmetrical component method and the DC component limited by a boundary condition can be stacked, and near-open pole and back-open pole current calculation formulas can be obtained.

Description

A kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault
Technical field
The present invention relates to high-voltage AC breaker short-circuit test technical field, specially a kind of to be used for asymmetric fault condition The computational methods of bipolar current parameter are opened after lower.
Background technology
China's power system is divided into system with effectively earthed neutral and system with non effectively earth ed neutral.Generation three-phase shortcircuit During failure, short circuit current is made up of AC compounent and DC component two parts respectively.Test method T100a is for examining open circuit Device was determined to cut-off a type approval test of more severe degree by the contact separation moment.
In straightway testing, as long as first opening electrode current parameter (last current half wave peak valueLast half-wave duration of Δ t, Current zero DC component percentage and current zero-crossing point slope di/dt) and transient recovery voltage (TRV) waveform meet standard Require, it is secondary open pole and open pole parameter with evening meet automatically.But as power system capacity is continuously increased, for breaker type approval test Put forward higher requirement, due to laboratory capacity limit, the higher breaker of electric pressure can only adopt equivalent synthesis to try Test method.Need to open pole and evening and open under the conditions of last half wave parameter of electrode current calculates asymmetric fault by secondary in synthetic test method The correction value of transient recovery voltage (TRV) parameter.International Electrotechnical Commission's distribution<IEC 62271-101 High-voltage switchgear and controlgear-Part 101:Synthetic testing>In when giving part-time constant, τ After open bipolar current parameter, but China's national standard is not completely covered《GB 1984-2014 high-voltage AC breakers》Middle institute There is the situation (during such as τ=100ms) of time constant.The two poles of the earth electricity is opened under the conditions of not suggesting that asymmetric fault at present after (T100a) The computational methods of stream parameter.
The content of the invention
For problems of the prior art, the present invention provides a kind of for opening the two poles of the earth electricity after under the conditions of asymmetric fault The computational methods of stream parameter, solve and cannot open half crest value of bipolar current after calculating acquisitionHalf-wave duration of Δ The problem of t, current zero DC component percentage and current zero-crossing point slope di/dt.
The present invention is to be achieved through the following technical solutions：
A kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault, comprise the following steps：
, there is three phase short circuit fault, obtain first opening phase zero-acrross ing moment t in step 10Before, each phase current of breaker is flow through, It is as follows,
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor short circuit current AC compounent Peak value；
Step 2, first opens phase zero-acrross ing moment t0Afterwards, the AC compounent and DC component for opening electrode current respectively to rear two is carried out Independent vector calculus, obtains corresponding expression formula；
Step 3, calculated AC compounent and DC component are overlapped, and bipolar current parameter is opened after obtaining.
Preferably, when asymmetric fault occurs in system with non effectively earth ed neutral, comprise the following steps that,
Step 1, when there is three phase short circuit fault, the electric current for flowing through breaker is：
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor short circuit current AC compounent Peak value；
Step 2, t0Moment A phase short circuit current blow-out first, t >=t in zero passage0When, after open the AC compounent of electrode current For,
DC component is,
Wherein, DC component attenuation coefficient when the two poles of the earth become single-phase loop is opened after K is；
Step 3, t >=t0When, after open electrode current expression formula and be,
Further, step 1) in, short circuit current is decomposed into into AC compounentAnd DC componentCarry out operation independent.
Further, step 3) in, the intrinsic parameter of system does not change when three-phase current all cut-offs, i.e. the time is normal Number τ keeps constant.
Preferably, when asymmetric fault occurs in system with effectively earthed neutral, it is as follows to specifically include step,
Step 1, when there is three phase short circuit fault, the electric current for flowing through breaker is：
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor short circuit current AC compounent Peak value；
Step 2, specifically includes following steps,
Step 2.1, t0Moment A phase short circuit current blow-out first in zero passage, using symmetrical component method, when first opening polar system number During equal to 1.3, i.e. X1=X2, X0=3X1, obtain,
t≥t0When, the AC compounent expression formula of B, C biphase current is,
The DC component of B, C biphase current is identical, and expression formula is,
Wherein, K1Current dc component attenuation coefficient in rear residue phase is cut-off to first open level；
Step 2.2, t1It is moment, secondary to open grade C phases short circuit current blow-out in zero passage, obtained using symmetrical component method,
t≥t1When, evening opens the AC compounent expression formula of electrode current and is,
Evening opens the DC component expression formula of electrode current,
Wherein, K2Current dc component attenuation coefficient in rear residue phase is cut-off for secondary pole of opening；
Step 2.3, is obtained by the result of calculation of step 2.1 and 2.2,
Work as t0≤ t ＜ t1When, it is secondary open pole and open electrode current expression formula with evening be：
As t >=t1When, evening opens electrode current and is changed into：
Further, in step 2.1, when polar system number is first opened equal to 1.2, X1=X2, X0=2X1。
Compared with prior art, the present invention has following beneficial technique effect：
The present invention is a kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault, is opened after obtaining Bipolar current expression formula is applied to central point effectively earthed system and system with non effectively earth ed neutral, to AC compounent and straight After flow component carries out Vector operation respectively, in the polar plot that symmetrical component method is obtained AC compounent with by boundary condition limit DC component superposition is just obtained time opens pole electrode current computing formula is opened with after.Expression formula is easy to solve each electrode current half accordingly Crest valueHalf-wave duration of Δ t, current zero DC component percentage and current zero-crossing point slope di/dt, are synthesis Under the conditions of asymmetric fault is calculated during test, TRV parameters revisions coefficient provides theoretical foundation.
Further, when AC compounent is calculated, using symmetrical component method, AC compounent can be obtained and is mutually cut-off from first opening To the change procedure in the final interrupting process of three-phase current；When DC component is calculated, using principle of continuity of electric current, can obtain To DC component from first opening the change procedure that mutually cut-offs in the final interrupting process of three-phase current.
Description of the drawings
Fig. 1 is to first open equivalent electric after the A phase blow-outs of pole in system with non effectively earth ed neutral described in present example 1 Road.
Fig. 2 is voltage and current alternating component vector in system with non effectively earth ed neutral described in present example 1 Road.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.
Embodiment 1
A kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault of the present invention, it is non-for neutral point Effectively earthed system, comprises the following steps：
1), when there is three phase short circuit fault, the electric current for flowing through breaker is：
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor short circuit current AC compounent Peak value.Short circuit current is decomposed into into AC compounentAnd DC componentCarry out independence Computing.
2)t0The blow-out first in zero passage of moment A phase short circuit current, after open the two poles of the earth series connection be changed into single-phase loop, each point voltage And the sense of current is as shown in figure 1, obtain each point voltage and current vector relation using circuit theory as shown in Fig. 2 t >=t can be obtained0 When, after open the AC compounent of electrode current and be：
3) the intrinsic parameter of system does not change when three-phase current all cut-offs, i.e., timeconstantτ keeps constant, Therefore open pole DC component to continue with e after-t/τExponential form decay, be only that initial value changes, therefore t >=t0When, after Opening electrode current expression formula is：
Wherein, DC component attenuation coefficient when pole becomes single-phase loop is opened after K is.K can pass through t0The constraint at moment Condition is obtained：
Embodiment 2
A kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault of the present invention, have for neutral point Effect earthed system, comprises the following steps：
1) after there is three phase short circuit fault, t0Moment A phase short circuit current blow-out first in zero passage, using symmetrical components Method, when polar system number is first opened equal to 1.3, i.e. X1=X2, X0=3X1, t >=t can be obtained0When, the AC compounent of B, C biphase current Expression formula is：
2)t1Moment time opens grade C phases short circuit current blow-out in zero passage, using symmetrical component method, can obtain t >=t1When, Evening opens the AC compounent expression formula of electrode current：
3), after being superimposed DC component, secondary pole of opening just is obtained and electrode current expression formula is opened with evening.Work as t0≤ t ＜ t1When, it is secondary to open pole Electrode current expression formula is opened with evening is：
As t >=t1When, evening opens electrode current and is changed into：
Wherein, K1, K2Respectively first open level current dc component attenuation coefficient in rear residue phase is cut-off with secondary pole of opening.
4) boundary condition same with formula (4), solution is utilized to obtain corresponding K1, K2Value.
Embodiment 3
A kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault of the present invention, have for neutral point Effect earthed system, during for first opening polar system number equal to 1.2, by X1=X2, X0=2X1Substitute into computing, remaining process and enforcement Example 2 is identical.

Claims (6)

1. a kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault, it is characterised in that including following Step：
, there is three phase short circuit fault, obtain first opening phase zero-acrross ing moment t in step 10Before, each phase current of breaker is flow through, it is as follows It is shown,
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor the peak of short circuit current AC compounent Value；
Step 2, first opens phase zero-acrross ing moment t0Afterwards, the AC compounent and DC component for opening electrode current respectively to rear two carries out independence Vector calculus, obtain corresponding expression formula；
Step 3, calculated AC compounent and DC component are overlapped, and bipolar current parameter is opened after obtaining.
2. a kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault according to claim 1, Characterized in that, when asymmetric fault occurs in system with non effectively earth ed neutral, comprise the following steps that,
Step 1, when there is three phase short circuit fault, the electric current for flowing through breaker is：
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor the peak of short circuit current AC compounent Value；
Step 2, t0Moment A phase short circuit current blow-out first, t >=t in zero passage0When, after open the AC compounent of electrode current and be,
DC component is,
I BC D C % = Ke - ( t - t 0 ) / &tau; = i B - I BC A C % | t = t 0 ;
Wherein, DC component attenuation coefficient when the two poles of the earth become single-phase loop is opened after K is；
Step 3, t >=t0When, after open electrode current expression formula and be,
3. computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault according to claim 2, which is special Levy and be：Step 1) in, short circuit current is decomposed into into AC compounentAnd DC component Carry out operation independent.
4. computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault according to claim 2, which is special Levy and be：Step 3) in, the intrinsic parameter of system does not change when three-phase current all cut-offs, i.e., timeconstantτ keeps It is constant.
5. a kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault according to claim 1, Characterized in that, when asymmetric fault occurs in system with effectively earthed neutral, it is as follows to specifically include step,
Step 1, when there is three phase short circuit fault, the electric current for flowing through breaker is：
Wherein, α is closing phase angle,For power-factor angle, τ is intrinsic time constant, ImFor the peak of short circuit current AC compounent Value；
Step 2, specifically includes following steps,
Step 2.1, t0The blow-out first in zero passage of moment A phase short circuit current, using symmetrical component method, is equal to when polar system number is first opened When 1.3, i.e. X1=X2, X0=3X1, obtain,
t≥t0When, the AC compounent expression formula of B, C biphase current is,
The DC component of B, C biphase current is identical, and expression formula is,
I B D C % &prime; = K 1 e - ( t - t 0 ) / &tau; = i B - I B A C % &prime; | t = t 0 ;
Wherein, K1Current dc component attenuation coefficient in rear residue phase is cut-off to first open level；
Step 2.2, t1It is moment, secondary to open grade C phases short circuit current blow-out in zero passage, obtained using symmetrical component method,
t≥t1When, evening opens the AC compounent expression formula of electrode current and is,
Evening opens the DC component expression formula of electrode current,
I B D C % &prime; &prime; = K 2 e - ( t - t 1 ) / &tau; = I B &prime; - I B A C % &prime; &prime; | t = t 1 ;
Wherein, K2Current dc component attenuation coefficient in rear residue phase is cut-off for secondary pole of opening；
Step 2.3, is obtained by the result of calculation of step 2.1 and 2.2,
Work as t0≤ t ＜ t1When, it is secondary open pole and open electrode current expression formula with evening be：
As t >=t1When, evening opens electrode current and is changed into：
6. a kind of computational methods for bipolar current parameter is opened after under the conditions of asymmetric fault according to claim 5, Characterized in that, in step 2.1, when polar system number is first opened equal to 1.2, X1=X2, X0=2X1。
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CN109116165A (en) * 2018-07-24 2019-01-01 国家电网公司西北分部 A kind of calculation of characteristic parameters method and device
CN110376517A (en) * 2019-07-31 2019-10-25 国网安徽省电力有限公司电力科学研究院 Determine the method, system and storage medium of Current Waveform Characteristics parameter
CN112147396A (en) * 2020-09-09 2020-12-29 中国电力科学研究院有限公司 Method and system for calculating percentage of direct current component of short-circuit current

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107085182A (en) * 2017-04-13 2017-08-22 国网江西省电力公司电力科学研究院 A kind of primary cut-out resistance to shorting current capacity check method
CN107085182B (en) * 2017-04-13 2019-05-21 国网江西省电力公司电力科学研究院 A kind of high-voltage circuitbreaker resistance to shorting current capacity check method
CN107121604A (en) * 2017-04-17 2017-09-01 上海电力学院 A kind of unsymmetrical short-circuit current dc component damping time constant acquisition methods
CN108363004A (en) * 2018-01-31 2018-08-03 陕西乐般电力科技有限公司 A kind of current half wave parameter reading computational methods
CN108519553A (en) * 2018-03-30 2018-09-11 中国西电电气股份有限公司 The last current half wave calculation method of parameters of high-voltage AC breaker T100a breaking tests
CN108519553B (en) * 2018-03-30 2020-07-03 中国西电电气股份有限公司 Method for calculating last current half-wave parameter of high-voltage alternating-current circuit breaker T100a breaking test
CN109116165A (en) * 2018-07-24 2019-01-01 国家电网公司西北分部 A kind of calculation of characteristic parameters method and device
CN109116165B (en) * 2018-07-24 2020-12-22 国家电网公司西北分部 Characteristic parameter calculation method and device
CN109031125A (en) * 2018-10-23 2018-12-18 国家电网有限公司 Method for determining generator outlet terminal shortcircuit fault current DC Time Constant
CN110376517A (en) * 2019-07-31 2019-10-25 国网安徽省电力有限公司电力科学研究院 Determine the method, system and storage medium of Current Waveform Characteristics parameter
CN112147396A (en) * 2020-09-09 2020-12-29 中国电力科学研究院有限公司 Method and system for calculating percentage of direct current component of short-circuit current
CN112147396B (en) * 2020-09-09 2023-01-31 中国电力科学研究院有限公司 Method and system for calculating percentage of direct current component of short-circuit current

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