CN1012998B - Bridge-type measuring circuit of current after arc in area of null current - Google Patents
Bridge-type measuring circuit of current after arc in area of null currentInfo
- Publication number
- CN1012998B CN1012998B CN 85104340 CN85104340A CN1012998B CN 1012998 B CN1012998 B CN 1012998B CN 85104340 CN85104340 CN 85104340 CN 85104340 A CN85104340 A CN 85104340A CN 1012998 B CN1012998 B CN 1012998B
- Authority
- CN
- China
- Prior art keywords
- current
- noninductive
- arc
- shunts
- test product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention provides a measuring method of post-arc current in a new high-voltage strong-current measuring technique. In the measuring method, a bridge type signal input circuit is composed of a measured article (a compensation capacitor thereof), double non-inductive current dividers and a stranded conducting wire connecting the measured article and the double non-inductive current dividers, and the post-arc current is measured by a coaxial cable and a signal display device. The measuring method of the present invention can eliminate interference to the measurement of post-arc current in another area on the conducting wire because of traveling-wave current and the capacitive coupling current of a high voltage side conducting wire for a low voltage side conducting wire and can also effectively eliminate the influence on capacitive current between the fractures of the measured article, and therefore, the precise measurement of the post-arc current in another area is realized.
Description
The invention belongs to a kind of measurement circuit of circuit of current after arc in area of null current in high voltage, the heavy current measuring technology.
The measuring circuit 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 circuit 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 circuit, 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 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 circuit 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 objective of the invention is to provide a kind of improved post-arc current measurement circuit, 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.(7) electric capacity of stray capacitance between the 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 influence of electric capacity (7) electric current between the test product fracture, realize the accurate measurement of circuit of current after arc in area of null current.
Claims (1)
- A kind of high voltage, in the heavy current measuring technology by test product, twisted-pair wire, two noninductive shunts, multi-screen covers the bridge-type measuring circuit of the current zero period post-arc current of concentric cable and signal display apparatus composition, it is characterized in that adopting the stranded conductor of two mutually insulateds, wherein, the low-pressure side of one termination test product [1] of a lead, 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 two stranded conductors equates with two resistances respectively, corresponding shunt in the suitable noninductive shunt [3] of time constant joins, the other end of these two noninductive shunts has a common ground point [0], thereby make 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 [5], thereby realizes the measurement of current zero period post-arc current.
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 CN85104340A (en) | 1986-12-03 |
| CN1012998B true 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) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364606B (en) * | 2012-03-27 | 2015-09-02 | 赛锐(青岛)自动化技术有限公司 | Simultaneously Measurement accuracy voltage and current system and adopt the instrument of this system |
| DE102016124164A1 (en) * | 2016-12-13 | 2018-06-14 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Apparatus and method for measuring an electrical current in an electrical conductor |
| 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 |
| 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 |
| DE102019109394A1 (en) * | 2019-04-10 | 2020-10-15 | Lisa Dräxlmaier GmbH | CONNECTING CABLE FOR HIGH CURRENTS AND / OR VOLTAGES, TEST DEVICE AND PROCEDURE FOR CREATING A BALANCING AREA |
| CN112180145B (en) * | 2020-09-29 | 2021-05-28 | 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 |
-
1985
- 1985-06-05 CN CN 85104340 patent/CN1012998B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104340A (en) | 1986-12-03 |
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