CN106526471B - It is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault - Google Patents
It is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provide it is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, solve the problems, such as can not by calculate obtain after open bipolar current parameter.It includes the following steps, step 1, three phase short circuit fault occurs, obtains first opening phase zero-acrross ing moment t0Before, each phase current of breaker is flowed through；Step 2, phase zero-acrross ing moment t is first opened0Later, the AC compounent and DC component for opening electrode current to rear two respectively carry out independent vector calculus, obtain corresponding expression formula；Step 3, the AC compounent being calculated and DC component are overlapped, bipolar current parameter is opened after obtaining.The present invention opens bipolar current expression formula suitable for central point effectively earthed system and system with non effectively earth ed neutral after obtaining, after carrying out vector calculating respectively to AC compounent and DC component, AC compounent in polar plot that symmetrical component method obtains is superimposed with the DC component limited by boundary condition to obtain time opening pole and opens electrode current calculation formula with after.
Description
Technical field
The present invention relates to high-voltage AC breaker short-circuit test technical fields, specially a kind of to be used for asymmetric fault condition
The calculation method of bipolar current parameter is opened after lower.
Background technique
China's electric system is divided into system with effectively earthed neutral and system with non effectively earth ed neutral.Three-phase shortcircuit occurs
When failure, short circuit current is made 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
It is required that 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
More stringent requirements are proposed, and due to laboratory capacity limit, the higher breaker of voltage class can only be tried using equivalent synthesis
Test method.It needs to open pole and under the conditions of evening opens last half wave parameter of electrode current and 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 institute in China's national standard " GB 1984-2014 high-voltage AC breaker " is not completely covered
The case where having time constant (when such as τ=100ms).It does not suggest that at present and opens the two poles of the earth electricity under the conditions of asymmetric fault after (T100a)
Flow the calculation method of parameter.
Summary of the invention
Aiming at the problems existing in 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 calculation method for flowing parameter, solving can not be by opening 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:
It is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, comprising the following steps:
Step 1, three phase short circuit fault occurs, obtains first opening phase zero-acrross ing moment t0Before, each phase current of breaker is flowed through,
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, phase zero-acrross ing moment t is first opened0Later, the AC compounent and DC component for opening electrode current to rear two respectively carry out
Independent vector calculus obtains corresponding expression formula；
Step 3, the AC compounent being calculated and DC component are overlapped, bipolar current parameter is opened after obtaining.
Preferably, when asymmetric fault occurs in system with non effectively earth ed neutral, specific step is as follows,
Step 1, when three phase short circuit fault occurs, the electric current of breaker is flowed through are 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, 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 circuit is opened after K is；
Step 3, t >=t0When, after open electrode current expression formula and be,
Further, in step 1), short circuit current is decomposed into AC compounentAnd DC componentCarry out operation independent.
Further, in step 3), the intrinsic parameter of system does not change when three-phase current is all cut-off, i.e. the time is normal
Number τ is remained unchanged.
Preferably, when asymmetric fault occurs in system with effectively earthed neutral, specifically include that steps are as follows,
Step 1, when three phase short circuit fault occurs, the electric current of breaker is flowed through are 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, specifically comprise the 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
When equal to 1.3, i.e. X1=X2, X0=3X1, it obtains,
t≥t0When, the AC compounent expression formula of B, C biphase current is,
B, the DC component of C biphase current is identical, and expression formula is,
Wherein, K1Current dc component attenuation coefficient in rear remaining phase is cut-off to first open grade；
Step 2.2, t1It is moment, secondary to open grade C phase short circuit current blow-out in zero passage, it is obtained using symmetrical component method,
t≥t1When, evening opens the AC compounent expression formula of electrode current and is,
The DC component expression formula that evening opens electrode current is,
Wherein, K2Current dc component attenuation coefficient in rear remaining phase is cut-off for secondary pole of opening；
Step 2.3, it is obtained by the calculated result of step 2.1 and 2.2,
Work as t0≤ t < t1When, it is secondary to open pole and evening opens electrode current expression formula are as follows:
As t >=t1When, evening, which opens electrode current, to be become:
Further, in step 2.1, when first opening polar system number equal to 1.2, X1=X2, X0=2X1。
Compared with prior art, the invention has the following beneficial technical effects:
The present invention is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, is opened after obtaining
Bipolar current expression formula is suitable for central point effectively earthed system and system with non effectively earth ed neutral, to AC compounent and directly
After flow component carries out vector calculating respectively, in polar plot that symmetrical component method is obtained AC compounent with by boundary condition limitation
DC component superposition can obtain secondary pole of opening and open electrode current calculation formula 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, for synthesis
TRV parameters revision coefficient provides theoretical foundation under the conditions of calculating asymmetric fault when test.
Further, when calculating AC compounent, using symmetrical component method, AC compounent can be obtained and mutually cut-off from first opening
To the change procedure in the final interrupting process of three-phase current；When calculating DC component, using principle of continuity of electric current, can obtain
To DC component from first opening the change procedure mutually cut-off in the final interrupting process of three-phase current.
Detailed description of the invention
Fig. 1 is that equivalent electricity after the A phase blow-out of pole is first opened 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
Below 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
The present invention is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, non-for neutral point
Effectively earthed system, comprising the following steps:
1) when three phase short circuit fault occurs, the electric current of breaker is flowed through are 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.Short circuit current is decomposed into AC compounentAnd DC componentIt carries out independent
Operation.
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 become single-phase circuit, each point voltage
And current direction is as shown in Figure 1, obtain each point voltage and current vector relations using circuit theory as shown in Fig. 2, t >=t can be obtained0
When, after open the AC compounent of electrode current are as follows:
3) the intrinsic parameter of system does not change when three-phase current is all cut-off, i.e., timeconstantτ remains unchanged,
It will continue because hereafter opening pole DC component with e-t/τExponential form decaying, be only that initial value changes, therefore t >=t0When, after
Open electrode current expression formula are as follows:
Wherein, DC component attenuation coefficient when pole becomes single-phase circuit is opened after K is.K can pass through t0The constraint at moment
Condition obtains:
Embodiment 2
The present invention is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, has for neutral point
Imitate earthed system, comprising the following steps:
1) after three phase short circuit fault occurring, t0The blow-out first in zero passage of moment A phase short circuit current, utilizes symmetrical components
Method, when first opening polar system number equal to 1.3, i.e. X1=X2, X0=3X1, available t >=t0When, the AC compounent of B, C biphase current
Expression formula are as follows:
2)t1Moment time opens grade C phase short circuit current blow-out in zero passage, using symmetrical component method, available t >=t1When,
Evening opens the AC compounent expression formula of electrode current are as follows:
3) after being superimposed DC component, it can obtain time opening pole and evening opens electrode current expression formula.Work as t0≤ t < t1When, it is secondary to open pole
Electrode current expression formula is opened with evening are as follows:
As t >=t1When, evening, which opens electrode current, to be become:
Wherein, K1, K2It respectively first opens grade and cut-offs current dc component attenuation coefficient in rear remaining phase with secondary pole of opening.
4) using the same boundary condition with formula (4), solution obtains corresponding K1, K2Value.
Embodiment 3
The present invention is a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, has for neutral point
Earthed system is imitated, for first opening the case where polar system number is equal to 1.2, by X1=X2, X0=2X1Substitute into operation, remaining process and implementation
Example 2 is identical.
Claims (1)
1. a kind of for opening the calculation method of bipolar current parameter after under the conditions of asymmetric fault, which is characterized in that including following
Step:
Step 1, three phase short circuit fault occurs, obtains first opening phase zero-acrross ing moment t0Before, each phase current of breaker is flowed 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, phase zero-acrross ing moment t is first opened0Later, the AC compounent and DC component for opening electrode current to rear two respectively carry out independent
Vector calculus, obtain corresponding expression formula；
Step 3, the AC compounent being calculated and DC component are overlapped, bipolar current parameter is opened after obtaining；
When asymmetric fault occur in system with effectively earthed neutral, step 2, specifically comprise the following steps,
Step 2.1, t0The blow-out first in zero passage of moment A phase short circuit current is equal to using symmetrical component method when first opening polar system number
When 1.3, obtain,
t≥t0When, the AC compounent expression formula of B, C biphase current is,
B, the DC component of C biphase current is identical, and expression formula is,
Wherein, K1Current dc component attenuation coefficient in rear remaining phase is cut-off to first open grade；
Step 2.2, t1It is moment, secondary to open grade C phase short circuit current blow-out in zero passage, it is obtained using symmetrical component method,
t≥t1When, evening opens the AC compounent expression formula of electrode current and is,
The DC component expression formula that evening opens electrode current is,
Wherein, K2Current dc component attenuation coefficient in rear remaining phase is cut-off for secondary pole of opening；
Step 2.3, it is obtained by the calculated result of step 2.1 and 2.2,
Work as t0≤ t < t1When, it is secondary to open pole and evening opens electrode current expression formula are as follows:
As t >=t1When, evening, which opens electrode current, to be become:
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| 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 |
| CN107121604B (en) * | 2017-04-17 | 2019-08-16 | 上海电力学院 | A kind of unsymmetrical short-circuit current dc component damping time constant acquisition methods |
| CN108363004B (en) * | 2018-01-31 | 2020-12-15 | 陕西乐般电力科技有限公司 | Current half-wave parameter reading and calculating method |
| 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 |
| CN109116165B (en) * | 2018-07-24 | 2020-12-22 | 国家电网公司西北分部 | Characteristic parameter calculation method and device |
| CN109031125B (en) * | 2018-10-23 | 2020-08-28 | 国家电网有限公司 | Method for determining direct current time constant of generator outlet end short-circuit fault current |
| 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 |
| 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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Address after: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an Patentee after: Xi'an High Voltage Electrical Apparatus Research Institute Co.,Ltd. Patentee after: Xi'an High Voltage Apparatus Research Institute Changzhou Co., Ltd Address before: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an Patentee before: XI'AN HIGH VOLTAGE APPARATUS RESEARCH INSTITUTE Co.,Ltd. Patentee before: Xi'an High Voltage Apparatus Research Institute Changzhou Co., Ltd |