CN100464384C - Low voltage heavy current tank loop with arc-striking branch - Google Patents
Low voltage heavy current tank loop with arc-striking branch Download PDFInfo
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- CN100464384C CN100464384C CNB2006100763018A CN200610076301A CN100464384C CN 100464384 C CN100464384 C CN 100464384C CN B2006100763018 A CNB2006100763018 A CN B2006100763018A CN 200610076301 A CN200610076301 A CN 200610076301A CN 100464384 C CN100464384 C CN 100464384C
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Abstract
The disclosed low-voltage large-current tank loop with an arc-strike branch to switch the ac arc comprises: a tank loop with a capacitor C1, a close switch S1, an inductance L1, a tested breaker arc-chute, and a by-pass resistance R2; and an arc-strike loop with an electrolytic capacitor C4, a diode D1, a current-limiting resistance R1, a thyristor Q1, and the all of the former L1, arc-chute and R2. This invention improves prior art.
Description
Technical field
The present invention relates to a kind of oscillation circuit topological structure of switch AC electric arc, specifically, be meant a kind of low-voltage and high-current oscillation circuit with striking branch road of switch AC electric arc, the present invention simultaneously is applicable to the conventional synthesis loop of low-voltage and high-current and the little electric current of high voltage.
Background technology
In the work of research circuit breaker, an important content is further to improve the performance of circuit breaker at present, improves the mechanism that produces electric arc in its breaking capacity and the research breaking course.In order to carry out above-mentioned work, need a cover to be convenient to do the large capacity equipment of a large amount of experimental studies, combiner circuit is exactly an example.In some research departments at home and abroad, all adopt combiner circuit to carry out the theoretical research of circuit breaker breaking capacity test and relevant arc characteristic at present.Conventional synthesis loop utilizes two to overlap independently power supply: low-voltage and high-current power supply (abbreviation current source) and high voltage low current power supply (abbreviation voltage source) replace original independent high voltage, high-current supply.The advantage of synthesis loop is that equivalence is good, the electric current and voltage situation when comparatively the real simulated power network switch cut-offs in circuit, and this method can significantly reduce the requirement to the testing equipment capacity.
When the various characteristics of research alternating current arc, often adopt the Weir combiner circuit that more typically has the striking branch road in the combiner circuit.The topological structure of its circuit as shown in Figure 1, resistance R 4 is formed the striking branch road with combined floodgate switch HK2 in Fig. 1, capacitor C1 and inductance L 1 are formed current source, form voltage source by capacitor group C2 and inductance L 2.HK1 is the combined floodgate switch, and FD is an auxiliary circuit breaker, and SD is tested circuit breaker, and G triggers the ball discharge gap device, and S is noninductive shunt, and K is a time controller, the time of discharge breakdown in the control ball crack.Its course of work is as follows: at first, combined floodgate switch HK1, combined floodgate switch HK2, auxiliary circuit breaker FD, tested circuit breaker SD all is in open position, charged in accordance with regulations to capacitor C1 and capacitor group C2 in advance, with auxiliary circuit breaker FD and tested circuit breaker SD closure, when first time t1, connect the combined floodgate switch HK2 of striking branch road earlier, capacitor C1 just has electric current through inductance L 1, resistance R 4, combined floodgate switch HK2, auxiliary circuit breaker FD, the circuit discharging of tested circuit breaker SD, as long as the numerical value of resistance R 4 is chosen suitablely, discharging current is controlled at about 100A, this moment, discharge current waveform was approximately direct current, the contact of auxiliary circuit breaker FD and tested circuit breaker SD is separated, electric arc ignites between tested contact, when the 3rd time t3, connect combined floodgate switch HK1, begin the electric current of capacitor C1 through inductance L 1 this moment, combined floodgate switch HK1, auxiliary circuit breaker FD and tested circuit breaker SD discharge, at this moment electric current is a test current, is the sinusoidal waveform electric current tested circuit breaker of flowing through.(the 4th time t4 is constantly) trigger sphere gap before current over-zero, ball-gap discharge punctures, and introduces voltage source, and auxiliary circuit breaker FD extinguishes when current over-zero then, and adds the transient recovery voltage of regulation between contact, finishes single test.The process that electric current changes in the circuit is seen shown in Figure 2.This circuit has good equivalence when the high voltage arc test, and has obtained generally acknowledging, still is applied in the electric arc theoretical research at present.
Characteristics with Weir synthesis loop of striking branch road be with striking branch road string in the oscillation circuit that inductance L 1 and capacitor C 1 formed, the striking electric current directly consumes the energy storage of capacitor C 1, owing to the combined floodgate switch HK1 dispersiveness of operate time, be difficult to obtain the exact current value.Figure 3 shows that low-voltage and high-current arc test circuit road, Fig. 1 right side topological structure.The circuit element naming method is identical with Fig. 1.The charging voltage of capacitor C 1 is several hectovolts among Fig. 3, and the electric current in the circuit is tens kilo-amperes, can pass through formula
(Im is the amplitude of circuital current, and Ui is the electric capacity charging voltage, ω=2 π f, f is a frequency of oscillation) calculates the oscillation circuit circuit parameter.The course of work basically identical of Fig. 3 circuit and Fig. 1 circuit, the waveform of generation and the waveform of Fig. 2 are basic identical, just slightly have any different constantly at the 4th time t4.The analysis found that under the striking electric current of expectation the sequencing control of circuit is very strict, circuit controls is difficult, and big in the energy consumption of striking stage capacitor C 1.
Summary of the invention
When studying electric arc in order to solve under the low-voltage and high-current condition, the shortcoming of the conventional Weir synthesis loop with striking branch road the invention provides a kind of novel oscillation circuit with striking branch road.The present invention adopts with the striking branch road and in the method at capacitor C 1 two ends, realizes the simple and reliable of circuit control.
The present invention is a kind of low-voltage and high-current oscillation circuit with striking branch road, is made up of striking branch road and oscillation circuit, and wherein capacitor C 1, combined floodgate switch S 1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute oscillation circuit; Electrochemical capacitor C4, Power Diode Pumped D1, current-limiting resistance R1, thyristor Q1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute the striking loop; The negative electrode of thyristor Q1 is connected between inductance L 1 and the combined floodgate switch S 1 in the striking loop, the anode of thyristor Q1 links to each other with current-limiting resistance R1, the current-limiting resistance R1 other end links to each other with the negative electrode of Power Diode Pumped D1 with electrochemical capacitor C4, is connected between capacitor C 1 and the shunt resistance R2 after electrochemical capacitor C4 and the Power Diode Pumped D1 parallel connection.
Described low-voltage and high-current oscillation circuit with striking branch road, the charging voltage of its capacitor C 1 is than the big 100V～1000V of charging voltage of electrochemical capacitor C4, the difference of the withstand voltage charging voltage than capacitor C 1 and electrochemical capacitor C4 of thyristor Q1 is big by 18～23%, and it is hundred Milliseconds that electrochemical capacitor C4 and current-limiting resistance R1 cooperate the striking branch road time constant that forms.
Described low-voltage and high-current oscillation circuit with striking branch road, before its work, the arc control device closure, combined floodgate switch S 1 is opened; In the work, thyristor Q1 triggers, and produces the direct current of 80A～100A then, opens tested arc-extinguishing chamber of circuit breaker then, closed again combined floodgate switch S 1.
The advantage of oscillation circuit of the present invention is: the striking branch road is in parallel with oscillation circuit, increase electrochemical capacitor C2, Power Diode Pumped D1, current-limiting resistance R1, thyristor Q1, not only solved the problem of original synthesis loop sequencing control difficulty, and make the striking electric current be independent of oscillation circuit, the initial charge voltage of capacitor C 1 is unaffected, and striking electric current, striking time, choosing of oscillation circuit electric current and voltage can consider respectively, and the volume of current-limiting resistance R1 and power all reduce to some extent.Thereby make the simplicity of design of oscillation circuit easily go, control convenient and reliable.
Description of drawings
Fig. 1 is the Weir synthesis loop with striking branch road conventional in the prior art.
Fig. 2 is the current waveform of the Weir synthesis loop with striking branch road of routine.
Fig. 3 is conventional low-voltage and high-current alternating current arc hookup structure.
Fig. 4 is the oscillation circuit circuit mechanism with striking branch road of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of low-voltage and high-current oscillation circuit of switch AC electric arc, is made up of striking branch road and oscillation circuit, and wherein capacitor C 1, combined floodgate switch S 1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute oscillation circuit; Electrochemical capacitor C4, Power Diode Pumped D1, current-limiting resistance R1, thyristor Q1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute the striking loop; Wherein the negative electrode of thyristor Q1 is connected between inductance L and the combined floodgate switch S 1, the anode of thyristor Q1 links to each other with current-limiting resistance R1, the current-limiting resistance R1 other end links to each other with the negative electrode of Power Diode Pumped D1 with electrochemical capacitor C4, is connected between capacitor C 1 and the shunt resistance R2 after electrochemical capacitor C4 and the Power Diode Pumped D1 parallel connection.In the design of striking loop, choose the charging voltage of capacitor C 1 should be than the charging voltage of electrochemical capacitor C4 big 100V～1000V, the difference of the withstand voltage charging voltage than capacitor C 1 and electrochemical capacitor C4 of thyristor Q1 is big by 18～23%, and it is hundred Milliseconds that electrochemical capacitor C4 and current-limiting resistance R1 cooperate the striking branch road time constant that forms.Low-voltage and high-current oscillation circuit of the present invention before work, the arc control device closure, combined floodgate switch S 1 is opened; In the work, thyristor Q1 triggers, and produces the direct current of 80A～100A then, opens tested arc-extinguishing chamber of circuit breaker then, closed again combined floodgate switch S 1.
In order to solve the shortcoming that routine has the Weir synthesis loop of striking branch road, in patent application of the present invention, the striking branch road (as shown in Figure 4) in parallel with tank circuit inductance proposed.Fig. 4 compares with Fig. 3, the topological structure difference is that the striking branch road is in parallel with tank circuit inductance, its operation principle is as follows: combined floodgate switch S 1 disconnects, tested arc-extinguishing chamber of circuit breaker closure, capacitor C 1 and electrochemical capacitor C4 are charged, and capacitor C 1 charging voltage is higher than electrochemical capacitor C4 charging voltage, at first time t1 constantly, trigger thyristor Q1, the work of striking branch road, electrochemical capacitor C4 is by resistance R 1, thyristor Q1, tested circuit breaker, shunt R2 discharge can guarantee that by precalculated parameter the current value of this branch road is about 100A, time constant is hundred milliseconds, can be similar in the time of its work and be seen as direct current.Disconnect tested circuit breaker constantly at second time t2, produce direct-current arc between the arc control device contact, at the 3rd time t3 constantly, closed combined floodgate switch S 1, insert oscillation circuit, thyristor bears the back-pressure shutoff and disconnects the striking branch road, and direct-current arc is because the existence of inductance can not decay to 0 rapidly, and alternating current arc results between contact.The alternating current arc zero passage is extinguished behind half cycle of arcing, finishes single test.In entire test, only need control thyristor Q1 conducting constantly, tested breaker arc extinguishing chamber contact is opened constantly, with 1 closing moment of combined floodgate switch S, thereby reduced conventional loop to circuit control strict demand constantly, and make that the design of circuit each several part running parameter is relatively independent, the peak value of voltage when the charging voltage of capacitor C 1 is its generation vibration.Whole test control is simple and reliable, the success rate height.
The low-voltage and high-current oscillation circuit with striking branch road of switch AC electric arc of the present invention.As shown in Figure 4, with electrolysis capacitor C 4, current-limiting resistance R1 and thyristor Q1, Power Diode Pumped D1 are as the striking branch road, and be parallel with oscillation circuit.By adjusting the parameter of electrochemical capacitor C4 and current-limiting resistance R1, can obtain to be similar within a certain period of time the 100A striking electric current of regarding direct current as, and to utilize the back-pressure that adds of thyristor Q1 be turn-off characteristic, disconnects the striking branch road when introducing oscillation circuit, guaranteed the equivalence with Fig. 3 circuit.
Claims (3)
1. low-voltage and high-current oscillation circuit with striking branch road, it is characterized in that: described low-voltage and high-current oscillation circuit is made up of striking branch road and oscillation circuit, and wherein capacitor C 1, combined floodgate switch S 1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute oscillation circuit; Electrochemical capacitor C4, Power Diode Pumped D1, current-limiting resistance R1, thyristor Q1, inductance L 1, tested arc-extinguishing chamber of circuit breaker and shunt resistance R2 constitute the striking loop; The negative electrode of thyristor Q1 is connected between inductance L 1 and the combined floodgate switch S 1 in the striking loop, the anode of thyristor Q1 links to each other with current-limiting resistance R1, the current-limiting resistance R1 other end links to each other with the negative electrode of Power Diode Pumped D1 with electrochemical capacitor C4, is connected between capacitor C 1 and the shunt resistance R2 after electrochemical capacitor C4 and the Power Diode Pumped D1 parallel connection.
2. the low-voltage and high-current oscillation circuit with striking branch road according to claim 1, it is characterized in that: the charging voltage of capacitor C 1 is than the big 100V～1000V of charging voltage of electrochemical capacitor C4, the difference of the withstand voltage charging voltage than capacitor C 1 and electrochemical capacitor C4 of thyristor Q1 is big by 18～23%, and it is hundred Milliseconds that electrochemical capacitor C4 and current-limiting resistance R1 cooperate the striking branch road time constant that forms.
3. the low-voltage and high-current oscillation circuit with striking branch road according to claim 1 is characterized in that: before the work of low-voltage and high-current oscillation circuit, and the arc control device closure, combined floodgate switch S 1 is opened; In the work, thyristor Q1 triggers, and produces the direct current of 80A～100A then, opens tested arc-extinguishing chamber of circuit breaker then, closed again combined floodgate switch S 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100763018A CN100464384C (en) | 2006-04-20 | 2006-04-20 | Low voltage heavy current tank loop with arc-striking branch |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100763018A CN100464384C (en) | 2006-04-20 | 2006-04-20 | Low voltage heavy current tank loop with arc-striking branch |
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| CN1845275A CN1845275A (en) | 2006-10-11 |
| CN100464384C true CN100464384C (en) | 2009-02-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102129033B (en) * | 2010-12-23 | 2013-01-09 | 中国西电电气股份有限公司 | Test loop used for direct-current switch test |
| CN104485266B (en) * | 2014-11-18 | 2017-02-01 | 华中科技大学 | Circuit breaker arcing time control device and method |
| CN107884673A (en) * | 2017-10-31 | 2018-04-06 | 华中科技大学 | A kind of device of DC fuse high current experiment |
| CN109031109B (en) * | 2018-07-25 | 2020-08-18 | 西安交通大学 | Circuit breaker post-arc current measuring device and method based on structural capacitance dynamic measurement and compensation |
| CN110514940B (en) * | 2019-09-27 | 2021-06-04 | 国网四川省电力公司电力科学研究院 | Device and method for testing arc extinguishing characteristic of direct current grounding electrode circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0556616A1 (en) * | 1992-02-20 | 1993-08-25 | Hitachi, Ltd. | Commutating type DC circuit breaker arrangement |
| JPH1040786A (en) * | 1996-07-18 | 1998-02-13 | Mitsubishi Electric Corp | Self-excited communication direct current breaker |
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2006
- 2006-04-20 CN CNB2006100763018A patent/CN100464384C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0556616A1 (en) * | 1992-02-20 | 1993-08-25 | Hitachi, Ltd. | Commutating type DC circuit breaker arrangement |
| JPH1040786A (en) * | 1996-07-18 | 1998-02-13 | Mitsubishi Electric Corp | Self-excited communication direct current breaker |
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