CN85104340A - The bridge-type measuring of circuit of current after arc in area of null current - Google Patents
The bridge-type measuring of circuit of current after arc in area of null current Download PDFInfo
- Publication number
- CN85104340A CN85104340A CN85104340.2A CN85104340A CN85104340A CN 85104340 A CN85104340 A CN 85104340A CN 85104340 A CN85104340 A CN 85104340A CN 85104340 A CN85104340 A CN 85104340A
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- current
- test product
- arc
- lead
- measuring method
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Abstract
The invention provides the measuring method of post-arc current in a kind of new high voltage, the heavy current measuring technology.It constitutes the bridge signal incoming line by test product (and building-out capacitor), two noninductive shunt and the stranded conductor that is connected the above two, and carries out the measurement of post-arc current by concentric cable and signal display apparatus.
Measuring method of the present invention can greatly be eliminated on the lead because of travelling wave current and high-pressure side lead and to what the capacitive coupling electric current of low-pressure side lead was caused other be distinguished the interference that post-arc current is measured, and also can eliminate the influence of capacitance current between the test product fracture effectively.Realize the accurate measurement of circuit of current after arc in area of null current.
Description
The invention belongs to a kind of method of testing of circuit of current after arc in area of null current in high voltage, the heavy current measuring technology.
The measuring method of common circuit of current after arc in area of null current is to be connected between test product (as isolating switch or other a breaking devices) low-pressure side and the noninductive shunt with a section lead, extract and the voltage signal that is directly proportional by the shunt electric current by noninductive shunt, and transfer to limiter and oscillograph (comprising direct current amplifier) from concentric cable.This method is big when post-arc current little (as the sulfur hexafluoride breaker that more and more widely adopts at present and vacuum circuit breaker etc.) or test product (as isolating switch or other breaking devices) size, connect lead-in wire when long, can not accurately measure.This is because this measuring method, can be on the connection lead between test product (as isolating switch or other breaking devices) and the noninductive shunt, cross in addition the back because the round travelling wave current of the electric current pressure drop on this lead formation high frequency at electric current.In addition, test product (as isolating switch or other breaking devices) high-pressure side forms a capacitive couple current by parasitic coupling capacitance between the stray capacitance between fracture, high-low pressure lead or shunt capacitance, this two electric current all flows through noninductive shunt volume and superimposed with post-arc current, (as: test product is tall and big at some test condition, connecting line is longer) under, above-mentioned two kinds of electric currents can reach the amperage magnitude, can be comparable with the post-arc current of sulfur hexafluoride breaker, even will be submerged.So this post-arc current measuring method is difficult to isolating switch, particularly the circuit of current after arc in area of null current of sulfur hexafluoride breaker is accurately measured.Thereby, the arc extinguishing process in the time of also can't being used for arc mathematics model research electric current and crossing other.
At above-mentioned shortcoming, the purpose of this invention is to provide a kind of improved post-arc current method of testing, to realize the accurate measurement of test product circuit of current after arc in area of null current.
The present invention is achieved in that between test product (and building-out capacitor) low-pressure side and the two noninductive shunts and is connected with the good twisted-pair wire of magnetic coupling, on two noninductive shunts, extract and the voltage signal that is directly proportional by two noninductive shunt electric currents, be transferred to signal display apparatus through concentric cable.
Measurement circuit of the present invention as shown in Figure 1, (1) test product (as isolating switch or other breaking devices).(2) twisted-pair wire of mutually insulated.(3) two noninductive shunts.(4) multi-screen covers concentric cable.(5) signal display apparatus (comprising limiter, oscillograph and direct current amplifier).(6) test product high-pressure side lead, the electric capacity of stray capacitance between (7) test product fracture or shunt capacitance or the former two's electric capacity sum.(8) building-out capacitor.
Main points of the present invention are to adopt the stranded conductor of two good mutually insulateds of magnetic coupling, the low-pressure side of a termination test product of a lead (as isolating switch and other breaking devices) (1) wherein, the mutually same end of another root is unsettled or be connected in series a building-out capacitor (8) and be connected with the high-pressure side lead (6) of test product, the other end of the stranded conductor of these two good mutually insulateds of magnetic coupling is identical with two resistances respectively, corresponding shunt in the suitable noninductive shunt (3) of time constant joins, the other end of two noninductive shunts has a public earth point (0), thereby makes signal input wires mode constitute twisted-pair wire, the bridge-type measuring circuit that two noninductive shunts are formed.The lead-in wire of the concentric cable that the output signal of two noninductive shunts is covered by multi-screen respectively (4) is transferred in the signal display apparatus (comprising limiter, oscillograph and direct current amplifier) (5).When an end of a lead in the stranded conductor of two good mutually insulateds of magnetic coupling was unsettled, this bridge-type measuring circuit can greatly be eliminated on the lead because of the interference that capacitive coupling caused measures circuit of current after arc in area of null current to the low-pressure side lead of travelling wave current and high-pressure side lead; When the value of the electric capacity (7) between test product (as isolating switch or other breaking devices) fracture is big, this unsettled end can be connected in series the suitable building-out capacitor (8) of electric capacity (7) value between and test product fracture in the stranded conductor, and the high-pressure side lead (6) with test product (as isolating switch or other breaking devices) joins again.Can more effectively play the compensating action of capacitance current like this, eliminate the current affects of electric capacity (7) between the test product fracture, realize the accurate measurement of circuit of current after arc in area of null current.
Claims (5)
1, adopts shunt and measure the method for circuit of current after arc in area of null current in a kind of high voltage, the heavy current measuring technology with connecting line, concentric cable, the signal display apparatus of test product, it is characterized in that it by test product [1], two noninductive shunt [3] be connected the good lead of two magnetic couplings of [1], [3] and constitute the bridge signal incoming line, and carry out the measurement of post-arc current by concentric cable and the signal display apparatus that multi-screen covers.
2, measuring method according to claim 1 is characterized in that the connecting line (2) between test product (1) and the two noninductive shunt (3) is the stranded conductor of two good mutually insulateds of magnetic coupling.
3, measuring method according to claim 2, the low-pressure side of a termination test product (1) that it is characterized in that a lead of stranded conductor (2), the end that another root lead is identical is unsettled, joins by the high-pressure side (6) of building-out capacitor (8) with test product in case of necessity.
4, measuring method according to claim 3 is characterized in that electric capacity (7) value is suitable between building-out capacitor (8) and test product fracture.
5, measuring method according to claim 1 is characterized in that the resistance of two shunts of two noninductive shunts (3) equates that time constant is suitable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104340 CN1012998B (en) | 1985-06-05 | 1985-06-05 | Bridge-type measuring circuit of current after arc in area of null current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104340 CN1012998B (en) | 1985-06-05 | 1985-06-05 | Bridge-type measuring circuit of current after arc in area of null current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104340A true CN85104340A (en) | 1986-12-03 |
| CN1012998B CN1012998B (en) | 1991-06-26 |
Family
ID=4793781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85104340 Expired CN1012998B (en) | 1985-06-05 | 1985-06-05 | Bridge-type measuring circuit of current after arc in area of null current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012998B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364606A (en) * | 2012-03-27 | 2013-10-23 | 赛锐(青岛)自动化技术有限公司 | System capable of accurately measuring voltage and current simultaneously and instrument adopting same |
| CN106597271A (en) * | 2016-12-16 | 2017-04-26 | 大连理工大学 | Post arc current measurement method based on current transfer characteristics and magnetic blowout |
| CN106771485A (en) * | 2016-12-16 | 2017-05-31 | 大连理工大学 | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out |
| CN108226603A (en) * | 2016-12-13 | 2018-06-29 | 保时捷股份公司 | For measuring the device and method of the electric current in electric conductor |
| CN112180145A (en) * | 2020-09-29 | 2021-01-05 | 广东电网有限责任公司佛山供电局 | Post-arc field emission current measurement compensation system for arc extinguish chamber |
| CN113424275A (en) * | 2019-04-10 | 2021-09-21 | 利萨·德雷克塞迈尔有限责任公司 | Connecting line for high currents and/or voltages, test device and method for creating a compensation region |
-
1985
- 1985-06-05 CN CN 85104340 patent/CN1012998B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364606A (en) * | 2012-03-27 | 2013-10-23 | 赛锐(青岛)自动化技术有限公司 | System capable of accurately measuring voltage and current simultaneously and instrument adopting same |
| CN108226603A (en) * | 2016-12-13 | 2018-06-29 | 保时捷股份公司 | For measuring the device and method of the electric current in electric conductor |
| CN106597271A (en) * | 2016-12-16 | 2017-04-26 | 大连理工大学 | Post arc current measurement method based on current transfer characteristics and magnetic blowout |
| CN106771485A (en) * | 2016-12-16 | 2017-05-31 | 大连理工大学 | Post-arc current measurement apparatus based on current transfer characteristic and magnetic blow-out |
| CN113424275A (en) * | 2019-04-10 | 2021-09-21 | 利萨·德雷克塞迈尔有限责任公司 | Connecting line for high currents and/or voltages, test device and method for creating a compensation region |
| CN112180145A (en) * | 2020-09-29 | 2021-01-05 | 广东电网有限责任公司佛山供电局 | Post-arc field emission current measurement compensation system for arc extinguish chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1012998B (en) | 1991-06-26 |
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