CN103207369A - Method for improving accuracy of breaking test data analysis of circuit breaker - Google Patents

Method for improving accuracy of breaking test data analysis of circuit breaker Download PDF

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CN103207369A
CN103207369A CN2013100912012A CN201310091201A CN103207369A CN 103207369 A CN103207369 A CN 103207369A CN 2013100912012 A CN2013100912012 A CN 2013100912012A CN 201310091201 A CN201310091201 A CN 201310091201A CN 103207369 A CN103207369 A CN 103207369A
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peak
voltage
test
current
isolating switch
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CN103207369B (en
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阎对丰
王安
姚斯立
牛安
王乐
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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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Abstract

The invention provides a method for improving the accuracy of breaking test data analysis of a circuit breaker. According to the method, a non-contact type photoelectric sensor is used, and signals are not affected by the high voltage, the high current and the strong electromagnetic field, so that the determined brake separating moment of the circuit breaker is accurate; and a peak value of a test current (test voltage) waveform is obtained through a parabola fitting based method, so that a large error caused by the rough waveform at the position of the peak value is avoided, and the precision of calculation of effective values of the test current and the test voltage before and after contact separation is improved. In a word, the method improves the accuracy of breaking test data analysis of the circuit breaker, so that the breaking performance of the circuit breaker can be judged correctly, and powerful technical support is provided for the development of national electrical power systems.

Description

A kind ofly improve the method that isolating switch cut-offs the test data analyzer accuracy
[technical field]
The present invention relates to the circuit-breaker testing technical field, particularly a kind ofly improve the method that isolating switch cut-offs the test data analyzer accuracy.
[background technology]
It is by reproducing a kind of test that its performance was checked and examined to the dissimilar representative failure mode that may occur in the electrical network in laboratory simulation that isolating switch cut-offs test, is one of main content of type approval test.The accuracy of test data analyzer is correctly to judge the key of isolating switch break performance, and test data analyzer comprises that contact separates many aspects such as forward and backward test current and the calculating of trial voltage effective value, the calculating of isolating switch arc time, opening time calculating.
The separation of demarcating in test contact of breaker exactly is the key that improves the test data analyzer accuracy with calculating test current (trial voltage) peak value constantly.
Under high voltage, big electric current, strong-electromagnetic field environment, traditional employing contact auxiliary signal (as contact kinetic characteristic sensor) determines that contact of breaker separates the influence that method constantly is subjected to electromagnetic field easily, the power frequency interference signals that usually superposeed on the signal and high frequency interference pulse signal, it is very big that accurate demarcation contact of breaker is separated influence constantly, test data analyzer precision as a result is not high, is difficult to guarantee correctly to pass judgment on the break performance of isolating switch.
In addition, the effective value that calculates test current (trial voltage) is to adopt three Peak Intensity Method, namely
I g = | ( I peak _ A + I peak _ C - 2 × I peak _ B ) 2 2 | ( U g = | ( U peak _ A + U peak _ C - 2 × U peak _ B ) 2 2 | )
Wherein, I gBe current effective value, I Peak_A, I Peak_BAnd I Peak_CBe the current value of separating brake last three adjacent peaks/troughs of current signal before the moment, U gBe voltage effective value, U Peak_A, U Peak_BAnd U Peak_CBe the current value of separating brake first three adjacent peaks/trough of voltage signal after the moment, its precision depends on the peak value that obtains test current (trial voltage) how exactly.Cut-off in the test because the influence of factors such as measurement system noise, higher hamonic wave, electromagnetic interference (EMI), sampling rate at isolating switch, the test current that collects (trial voltage) waveform is not smooth, continuous curve at the peak value place, selects for use the numerical value of single sample point probably can introduce very big error as the peak value of test current (trial voltage) when calculating test current (trial voltage) effective value.
[summary of the invention]
The purpose of this invention is to provide a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves, to solve the problems of the technologies described above.
To achieve these goals, the present invention adopts following technical scheme:
A kind ofly improve the method that isolating switch cut-offs the test data analyzer accuracy, comprising:
ⅰ, fix a steel disc at the operating mechanism of isolating switch, at the steel disc side a U-shaped photoelectric sensor is set; Be connected to positive pole and the negative pole of direct-flow storage battery respectively by a resistance at moving contact of breaker and static contact two ends;
ⅱ, carry out no-load test, when contact of breaker moved, operating mechanism drove the steel disc that arranges thereon and streaks U-shaped photoelectric sensor, produces a pulse signal; When contact separated, the loop disconnected, and ohmically voltage drops to zero by high level;
ⅲ, ⅰ in the step rising edge of pulse signal and ⅱ in the step on the resistance mistiming of the negative edge of voltage signal be △ t, adjust setting angle or the position of U-shaped photoelectric sensor on operating mechanism and make △ t＜0.5ms;
Resistance and the direct-flow storage battery built in ⅳ, the dismounting step I.
The present invention further improves and is: described operating mechanism comprises main shaft and connecting lever; Steel disc is installed on the main shaft; Connecting lever connects the moving contact of main shaft and isolating switch; Steel disc supports by insulating support and is fixing.
The present invention further improves and is: the long 10cm of described steel disc, wide 1.5cm.
The present invention further improves and is: after removing the resistance of building in the step I and direct-flow storage battery, carry out isolating switch and cut-off test, gather the output signal of current signal, voltage signal and U-shaped photoelectric sensor; Adopted then based on the para-curve fitting method and calculated test current/trial voltage peak value, specifically comprised:
1), to adjust the moment that the back pulse signal rising edge that produced of U-shaped photoelectric sensor separates as contact of breaker; First three adjacent half-wave shape of last three adjacent half-wave shapes of current signal before finding separating brake constantly/separating brake moment back voltage signal; Find absolute value maximum amplitude point in an electric current half-wave shape/voltage half-wave shape discrete data (tp+1, Ip+1)/(tp+1, Up+1), centered by this point, each gets adjacent P point again both sides;
Wherein
Figure BDA00002943247900031
T is the cycle of current/voltage, f sSample frequency for current/voltage;
2), to 2P+1 the discrete data that step 1 finds, carry out the quadratic polynomial match based on the principle of least square, obtain function i (t)=a 0+ a 1T+a 2t 2/ u (t)=a 0+ a 1T+a 2t 2
3), get t=-a 1/ (2 * a 2) time, the extreme value of function i (t)/u (t) is as the approximate value I of test current/trial voltage peak value Peak/ U Peak
4), repeating step 1)-3), calculate the approximate value of the test current/trial voltage peak value of other two half-wave shapes;
5), the peak value with test current/trial voltage of calculating is updated to formula:
I g = | ( I peak _ A + I peak _ C - 2 × I peak _ B ) 2 2 | Or U g = | ( U peak _ A + U peak _ C - 2 × U peak _ B ) 2 2 | In, obtain its corresponding current effective value/voltage effective value.
The present invention further improves and is:
The present invention further improves and is: T=0.02s.
Compared with prior art, the present invention has the following advantages:
1) the inventive method adopts contactless photoelectric sensor, and signal is not subjected to the influence of high voltage, big electric current, strong-electromagnetic field, and the breaker open operation of determining accurately constantly thus.
2) the inventive method obtains the peak value of test current (trial voltage) waveform based on the para-curve fitting method, avoided causing owing to waveform is rough at the peak value place than mistake, improved and calculated the precision that contact separates forward and backward test current and trial voltage effective value.
In a word, the inventive method has improved the accuracy that isolating switch cut-offs test data analyzer, and break performance that can the right judgement isolating switch is for the power system development of country provides strong technical guarantee.
[description of drawings]
Fig. 1 is the installation site synoptic diagram of steel disc and U-shaped photoelectric sensor;
Fig. 2 is the vertical view of Fig. 1;
The synoptic diagram of detected signal 1 and signal 2 when Fig. 3 is no-load test;
The output signal synoptic diagram of current signal, voltage signal and the U-shaped photoelectric sensor of gathering when Fig. 4 tests for killer switch;
Fig. 5 is the current signal/voltage signal of actual acquisition and the synoptic diagram of matched curve.
[embodiment]
See also Fig. 1 to shown in Figure 5, the present invention is a kind of to improve the method that isolating switch cut-offs the test data analyzer accuracy, comprises demarcating that contact of breaker separates step constantly and based on the test current of para-curve match, the calculation procedure of voltage peak; Based on above 2 accuracys that improve test data analyzer.
Demarcate contact of breaker and separate step constantly, specifically comprise:
ⅰ, fix a long 10cm at the operating mechanism (rotary or Direct Action Type) of isolating switch, the steel disc 1 of wide 1.5cm, placing U-shaped photoelectric sensor 2(insulating support 3 supports and fixing near steel disc 1 position), scheme of installation is seen Fig. 1 (front elevation) and Fig. 2 (vertical view).Be connected to positive pole and the negative pole of direct-flow storage battery respectively by a resistance at moving contact of breaker (7) and static contact (8) two ends.
ⅱ, determine that in no-load test (be not with high voltage and big electric current) contact separates the moment.Carry out no-load test, when contact of breaker moved, main shaft 4 rotations of operating mechanism were by moving contact 7 and static contact 8 separating brakes in the connecting lever 5 driving arc-chutes 6; Drive the steel disc 1 that arranges thereon in the time of main shaft 4 rotations and streak U-shaped photoelectric sensor 2, produce a pulse signal that is similar to square wave, see signal 1 among Fig. 3.When contact separated, the loop disconnected, and ohmically voltage drops to zero by high level, sees signal 2 among Fig. 3.
ⅲ, comparison ⅰ be the rising edge of pulse signal and the ⅱ mistiming △ t of the negative edge of voltage signal on the resistance in the step in the step, sees Fig. 3, makes △ t close to 0(or △ t＜0.5ms) by adjusting setting angle or the position of U-shaped photoelectric sensor 2 on main shaft 4.
ⅳ, the link circuit of building in the dismounting ⅱ step (direct-flow storage battery, resistance and connecting line) prevent in test high electrical breakdown between contact.
ⅴ, cut-off in the test moment of separating as contact of breaker with the rising edge of signal 1 at isolating switch.
So far, can in process of the test, demarcate the separation of contact of breaker exactly constantly, and calculate parameters such as isolating switch arc time, opening time.Peak value selected when having determined calculating test current (trial voltage) effective value is simultaneously numbered, and is respectively I Peak_A, I Peak_CAnd I Peak_B(U Peak_A, U Peak_CAnd U Peak_B), as shown in Figure 4.
In order to improve the accuracy of calculating test current (trial voltage) effective value, the present invention has also adopted based on the para-curve fitting method and has calculated test current (trial voltage) peak value, and know-why is seen Fig. 5, and concrete grammar is as follows:
The moment that ⅰ, the pulse signal rising edge that is produced with U-shaped photoelectric sensor 2 after adjusting separate as contact of breaker; First three adjacent half-wave shape of last three adjacent half-wave shapes of current signal before finding separating brake constantly/separating brake moment back voltage signal; Find absolute value maximum amplitude point in an electric current half-wave shape/voltage half-wave shape discrete data (tp+1, Ip+1)/(tp+1, Up+1), centered by this point, both sides each get again adjacent P point (
Figure BDA00002943247900061
Wherein T is the cycle of electric current or voltage, is generally 0.02s, f sSample frequency for curtage; Preferably
Figure BDA00002943247900062
).
ⅱ, this group discrete data (altogether 2P+1 point) is carried out the quadratic polynomial match based on the principle of least square, obtain function i (t)=a 0+ a 1T+a 2t 2Or u (t)=a 0+ a 1T+a 2t 2
ⅲ, get t=-a 1/ (2 * a 2) time, the extreme value of function i (t) (u (t)) is as the approximate value I of test current (trial voltage) peak value Peak(U Peak).
ⅳ, repeating step ⅰ-ⅲ calculate the approximate value of the test current/trial voltage peak value of other two half-wave shapes;
V, the peak value of the test current (trial voltage) that calculates is updated to formula:
I g = | ( I peak _ A + I peak _ C - 2 × I peak _ B ) 2 2 | Or U g = | ( U peak _ A + U peak _ C - 2 × U peak _ B ) 2 2 | In, obtain its corresponding current effective value or voltage effective value.

Claims (6)

1. one kind is improved the method that isolating switch cut-offs the test data analyzer accuracy, it is characterized in that, comprising:
ⅰ, fix a steel disc (1) at the operating mechanism of isolating switch, at steel disc (1) side a U-shaped photoelectric sensor (2) is set; Be connected to positive pole and the negative pole of direct-flow storage battery respectively by a resistance at moving contact of breaker (7) and static contact (8) two ends;
ⅱ, carry out no-load test, when contact of breaker moved, operating mechanism drove the steel disc (1) that arranges thereon and streaks U-shaped photoelectric sensor (2), produces a pulse signal; When contact separated, the loop disconnected, and ohmically voltage drops to zero by high level;
ⅲ, ⅰ in the step rising edge of pulse signal and ⅱ in the step on the resistance mistiming of the negative edge of voltage signal be △ t, adjust setting angle or the position of U-shaped photoelectric sensor (2) on operating mechanism and make △ t＜0.5ms;
Resistance and the direct-flow storage battery built in ⅳ, the dismounting step I.
2. a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves according to claim 1 is characterized in that, described operating mechanism comprises main shaft (4) and connecting lever (5); Steel disc (1) is installed on the main shaft (4); Connecting lever (5) connects the moving contact (7) of main shaft (4) and isolating switch; Steel disc (1) supports by insulating support (3) and is fixing.
3. a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves according to claim 1 is characterized in that, the long 10cm of described steel disc (1), wide 1.5cm.
4. a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves according to claim 1, it is characterized in that, after removing the resistance of building in the step I and direct-flow storage battery, carry out isolating switch and cut-off test, gather the output signal of current signal, voltage signal and U-shaped photoelectric sensor (2); Adopted then based on the para-curve fitting method and calculated test current/trial voltage peak value, specifically comprised:
1), to adjust the moment that the pulse signal rising edge that produced of the U-shaped photoelectric sensor in back (2) separates as contact of breaker; First three adjacent half-wave shape of last three adjacent half-wave shapes of current signal before finding separating brake constantly/separating brake moment back voltage signal; Find absolute value maximum amplitude point in an electric current half-wave shape/voltage half-wave shape discrete data (tp+1, Ip+1)/(tp+1, Up+1), centered by this point, each gets adjacent P point again both sides;
Wherein
Figure FDA00002943247800021
T is the cycle of current/voltage, f sSample frequency for current/voltage;
2), to 2P+1 the discrete data that step 1 finds, carry out the quadratic polynomial match based on the principle of least square, obtain function i (t)=a 0+ a 1T+a 2t 2/ u (t)=a 0+ a 1T+a 2t 2
3), get t=-a 1/ (2 * a 2) time, the extreme value of function i (t)/u (t) is as the approximate value I of test current/trial voltage peak value Peak/ U Peak
4), repeating step 1)-3), calculate the approximate value of the test current/trial voltage peak value of other two half-wave shapes;
5), the peak value with test current/trial voltage of calculating is updated to formula:
I g = | ( I peak _ A + I peak _ C - 2 × I peak _ B ) 2 2 | Or U g = | ( U peak _ A + U peak _ C - 2 × U peak _ B ) 2 2 | In, obtain its corresponding current effective value/voltage effective value.
5. a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves according to claim 4 is characterized in that,
Figure FDA00002943247800024
6. a kind of method that isolating switch cut-offs the test data analyzer accuracy that improves according to claim 4 is characterized in that T=0.02s.
CN201310091201.2A 2013-03-20 2013-03-20 Method for improving accuracy of breaking test data analysis of circuit breaker Active CN103207369B (en)

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Cited By (7)

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CN103558545A (en) * 2013-11-16 2014-02-05 沈阳工业大学 Device and method for detecting on-off prebreakdown time of breaker
CN103616553A (en) * 2013-12-05 2014-03-05 上海高试电气科技有限公司 Short circuit large current waveform fitting method
CN104502838A (en) * 2014-12-16 2015-04-08 中国西电电气股份有限公司 Method for calculating transient recovery voltage (TRV) waveform parameter
CN105572574A (en) * 2015-12-14 2016-05-11 中国西电电气股份有限公司 Device for measuring high-capacity breaking test sample arcing time and method thereof
CN105954020A (en) * 2016-05-31 2016-09-21 中车株洲电力机车有限公司 Method and device for detecting synchronism of disconnecting switch
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
CN111999641A (en) * 2020-08-07 2020-11-27 广安电气检测中心(广东)有限公司 Method and system for measuring rigid point in short circuit breaking experiment of circuit breaker

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CN201477189U (en) * 2009-04-23 2010-05-19 南京因泰莱配电自动化设备有限公司 Device for online detecting mechanical characteristics of 24 kV high-voltage vacuum circuit breaker
CN201681143U (en) * 2010-03-23 2010-12-22 西安工程大学 Online monitoring device for mechanical characteristic of high-voltage circuit breaker
CN102411124A (en) * 2011-08-02 2012-04-11 广东威恒输变电工程有限公司 Mechanical property test device for special breaker

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Publication number Priority date Publication date Assignee Title
CN201335878Y (en) * 2008-12-23 2009-10-28 上海德力西集团有限公司 Testing device for mechanical characteristics of vacuum circuit breaker based on DSP in medium voltage power network
CN201477189U (en) * 2009-04-23 2010-05-19 南京因泰莱配电自动化设备有限公司 Device for online detecting mechanical characteristics of 24 kV high-voltage vacuum circuit breaker
CN201681143U (en) * 2010-03-23 2010-12-22 西安工程大学 Online monitoring device for mechanical characteristic of high-voltage circuit breaker
CN102411124A (en) * 2011-08-02 2012-04-11 广东威恒输变电工程有限公司 Mechanical property test device for special breaker

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103558545A (en) * 2013-11-16 2014-02-05 沈阳工业大学 Device and method for detecting on-off prebreakdown time of breaker
CN103558545B (en) * 2013-11-16 2015-12-09 沈阳工业大学 A kind of isolating switch closes pre arcing time pick-up unit and method
CN103616553A (en) * 2013-12-05 2014-03-05 上海高试电气科技有限公司 Short circuit large current waveform fitting method
CN104502838A (en) * 2014-12-16 2015-04-08 中国西电电气股份有限公司 Method for calculating transient recovery voltage (TRV) waveform parameter
CN104502838B (en) * 2014-12-16 2017-07-11 中国西电电气股份有限公司 A kind of method for calculating transient recovery voltage waveform parameter
CN105572574A (en) * 2015-12-14 2016-05-11 中国西电电气股份有限公司 Device for measuring high-capacity breaking test sample arcing time and method thereof
CN105954020A (en) * 2016-05-31 2016-09-21 中车株洲电力机车有限公司 Method and device for detecting synchronism of disconnecting switch
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
CN111999641A (en) * 2020-08-07 2020-11-27 广安电气检测中心(广东)有限公司 Method and system for measuring rigid point in short circuit breaking experiment of circuit breaker

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