CN212255491U - Dynamic contact resistance detection circuit of high-voltage circuit breaker - Google Patents
Dynamic contact resistance detection circuit of high-voltage circuit breaker Download PDFInfo
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- CN212255491U CN212255491U CN202020564785.6U CN202020564785U CN212255491U CN 212255491 U CN212255491 U CN 212255491U CN 202020564785 U CN202020564785 U CN 202020564785U CN 212255491 U CN212255491 U CN 212255491U
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Abstract
The invention discloses a dynamic contact resistance detection circuit of a high-voltage circuit breaker, which solves the problem that test circuit elements are easy to burn when a super capacitor is used as a power supply of the dynamic contact resistance test circuit of the circuit breaker. Constructing a super capacitor charging circuit consisting of an alternating current voltage regulator, a rectifying module, an IGBT switch module and a super capacitor under the control of a central processing unit, and obtaining the voltages of the super capacitors with different voltage grades through the alternating current voltage regulator according to different specifications of the tested circuit breaker; the method comprises the steps that a test loop consisting of a super capacitor, an IGBT switch module, a Rogowski coil, a voltmeter and a high-voltage circuit breaker contact system is constructed, in the test loop, residual voltage discharging branches on the super capacitor consisting of the IGBT switch module and an arrester are connected in parallel at two ends of the super capacitor, so that the residual current of the super capacitor is absorbed, and the burning loss phenomenon of a test circuit element caused by the residual voltage is avoided.
Description
Technical Field
The invention relates to a dynamic contact resistance detection circuit of a high-voltage circuit breaker, in particular to a dynamic contact resistance detection circuit of a high-voltage circuit breaker, which can effectively avoid burning loss of a test element.
Background
The contact system of the high-voltage circuit breaker is a key component of high-voltage switch equipment, comprises a main contact and an arc contact, and mainly plays a role in switching on and switching off current, and the ablation condition directly influences the service performance and the service life of the switch equipment; at present, the performance of a contact system of a high-voltage switch circuit breaker is detected by connecting the high-voltage switch circuit breaker in a test power supply loop in series and evaluating the contact system by measuring loop resistance, the existing detection mode mainly comprises a static resistance detection mode and a dynamic resistance measurement mode, the static resistance detection method cannot truly reflect the state of an arc contact in the contact system, the conditions of relative abrasion, ablation, quality and the like of the contact cannot be accurately judged, and meanwhile, because the field detection has more connecting parts of switch equipment, the measurement error of the static resistance is larger; in order to judge the state of the contact system of the switchgear more comprehensively and accurately, the prior art generally adopts a dynamic contact resistance detection method.
The Chinese patent application with the patent number ZL2015108477634 discloses an SF6 circuit breaker dynamic contact resistance detection device, the technical scheme adopts a super capacitor power supply, a current acquisition device, a voltage acquisition device and a data processing system detection device, a super capacitor provides a power supply for a circuit breaker dynamic contact resistance test circuit, so that the current of a measurement loop is larger, the holding force between a movable main contact and a static main contact and between a movable arc contact and a static arc contact is larger, the measurement value of dynamic contact resistance is more stable, and the phenomenon of power supply burning loss can not occur; however, when dynamic resistance tests are carried out on different types of circuit breakers on site, the voltages of the supercapacitors which are required to be used as power supplies are different, and how to use a set of test circuit to meet the dynamic resistance tests of the circuit breakers with different voltage levels is a problem to be solved on site; in addition, when the super capacitor is used as a power supply of the test loop, because the capacity of the super capacitor is large, after the test work is finished, residual voltage exists on the super capacitor, the residual voltage can raise the basic voltage of the test circuit when the test circuit is tested next time, in addition, the test current is not easy to control, and the test elements in the test loop are easily burnt and damaged due to improper operation; in addition, the residual voltage on the super capacitor can also reduce the test precision of the dynamic resistor, and the accurate judgment of the working performance of the circuit breaker according to the dynamic resistor is influenced.
Disclosure of Invention
The invention provides a dynamic contact resistance detection circuit of a high-voltage circuit breaker, which solves the technical problem that test circuit elements are easy to burn when a super capacitor is used as a power supply of the dynamic contact resistance test circuit of the circuit breaker.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: constructing a super capacitor charging circuit consisting of an alternating current voltage regulator, a rectifying module, an IGBT switch module and a super capacitor under the control of a central processing unit, and obtaining the voltages of the super capacitors with different voltage grades through the alternating current voltage regulator according to different specifications of the tested circuit breaker; the method comprises the steps that a test loop consisting of a super capacitor, an IGBT switch module, a Rogowski coil, a voltmeter and a high-voltage circuit breaker contact system is constructed, in the test loop, residual voltage discharging branches on the super capacitor consisting of the IGBT switch module and an arrester are connected in parallel at two ends of the super capacitor, so that the residual current of the super capacitor is absorbed, and the burning loss phenomenon of a test circuit element due to the existence of residual voltage is avoided.
A high-voltage circuit breaker dynamic contact resistance detection circuit comprises a three-phase alternating current power supply, an alternating current voltage regulator, a rectifier module, an IGBT switch module, a super capacitor, a lightning arrester, a high-voltage circuit breaker, a Rogowski coil, an ARM processor and a voltmeter, wherein the three-phase alternating current power supply is connected with the input end of the alternating current voltage regulator, the output end of the alternating current voltage regulator is connected with the input end of the rectifier module, the collector electrode of a first IGBT switch module is connected with the output positive electrode of the rectifier module, the super capacitor is connected in parallel between the emitter electrode of the first IGBT switch module and the output negative electrode of the rectifier module, the base electrode of the first IGBT switch module is electrically connected with the ARM processor through an IGBT isolation driving circuit, the positive electrode of the super capacitor is connected with the collector electrode of a third IGBT switch module, the emitter electrode of the third IGBT switch module, the other end of the high-voltage circuit breaker is connected with the output negative electrode of the rectifier module, the base of the third IGBT switch module is electrically connected with the ARM processor through an IGBT isolation driving circuit, the two ends of the high-voltage circuit breaker are connected with a voltmeter in parallel, the input end of the high-voltage circuit breaker is provided with a Rogowski coil, the Rogowski coil and the voltmeter are respectively and electrically connected with the ARM processor through a signal processing module, a collector of the second IGBT switch module is connected between the positive electrode of the super capacitor and the collector of the third IGBT switch module, a lightning arrester is connected to the emitter of the second IGBT switch module, the other end of the lightning arrester is connected with the output negative electrode of the rectifier module, and the base of the second IGBT switch module is electrically connected with the ARM processor through the IGBT isolation driving circuit.
The ARM processor is respectively connected with a storage module, a calculation module and a communication module.
A high-voltage circuit breaker dynamic contact resistance detection method capable of avoiding burning loss of a test element is characterized by comprising the following steps:
the method comprises the following steps that firstly, a three-phase alternating-current power supply is input to an alternating-current voltage regulator, a rectification module converts alternating current into direct current, an output signal of an ARM processor controls a first IGBT switch module to be conducted through controlling an IGBT isolation driving circuit, the rectification module charges a super capacitor, and when a certain voltage is reached, the ARM processor outputs a control signal to control the first IGBT switch module to be turned off through the IGBT isolation driving circuit;
secondly, the output signal of the ARM processor controls the conduction of a third IGBT switch module through an IGBT isolation driving circuit, the super capacitor and the high-voltage circuit breaker form a loop, the switch operation of the high-voltage circuit breaker is carried out, the current flowing through the high-voltage circuit breaker is measured through the Rogowski coil, and the voltages at two ends of the high-voltage circuit breaker are measured through a voltmeter;
thirdly, inputting a current signal which is measured by the Rogowski coil and flows through the high-voltage circuit breaker and a voltage signal which is measured by the voltmeter into the ARM processor through the signal processing module, outputting the voltage signal to the calculation module by the ARM processor, feeding the calculation result back to the ARM processor by the calculation module, outputting the calculation result to the storage module by the ARM processor, and outputting the calculation result to the communication module by the ARM processor;
and fourthly, after the test work is finished, the ARM processor outputs signals to control the turn-off of the third IGBT switch module through the IGBT isolation driving circuit, then the ARM processor outputs signals to control the turn-on of the second IGBT switch module through the IGBT isolation driving circuit, the super capacitor, the second IGBT switch module and the lightning arrester form an energy absorption loop, so that the residual current of the super capacitor is absorbed by the lightning arrester, and the residual voltage on the super capacitor is zero.
According to the invention, a dynamic contact resistance detection loop is designed by adopting a voltage regulator, a rectifying unit, an IGBT, a super capacitor, an arrester and the like, a data monitoring analysis loop is designed by adopting a Rogowski coil, a signal processing module, an ARM processor, an IGBT driving control circuit and the like, and energy recovery is carried out on current in the loop by adopting the arrester through controlling the on and off of the IGBT, so that burning loss of detection elements is avoided, the detection of dynamic resistance of various types of high-voltage circuit breakers can be conveniently met, the detection loop is safer and more reliable, the accuracy of dynamic resistance measurement is improved, and the detection of the dynamic resistance is realized under the condition that high-voltage switch equipment is not disassembled; the invention meets the IEC61850 protocol, has standard functions and communication models, has high real-time performance, and simultaneously has the functions of real-time monitoring, data remote transmission, background analysis and the like.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a high-voltage circuit breaker dynamic contact resistance detection circuit comprises a three-phase alternating current power supply 1, an alternating current voltage regulator 2, a rectifier module 3, an IGBT switch module, a super capacitor 5, a lightning arrester 7, a high-voltage circuit breaker 9, a Rogowski coil 10, an ARM processor 14 and a voltmeter 11, wherein the three-phase alternating current power supply 1 is connected with the input end of the alternating current voltage regulator 2, the output end of the alternating current voltage regulator 2 is connected with the input end of the rectifier module 3, the collector of a first IGBT switch module 4 is connected with the output anode of the rectifier module 3, the super capacitor 5 is connected in parallel between the emitter of the first IGBT switch module 4 and the output cathode of the rectifier module 3, the base of the first IGBT switch module 4 is electrically connected with the ARM processor 14 through an IGBT isolation driving circuit 13, the anode of the super capacitor 5 is connected with the collector of a third IGBT switch module 8, the emitter of the third IGBT switch module 8 is connected with one end of a high-voltage circuit breaker 9, the other end of the high-voltage circuit breaker 9 is connected with the output cathode of a rectifier module 3, the base of the third IGBT switch module 8 is electrically connected with an ARM processor 14 through an IGBT isolation driving circuit 13, two ends of the high-voltage circuit breaker 9 are connected in parallel with a voltmeter 11, an input end of the high-voltage circuit breaker 9 is provided with a Rogowski coil 10, the Rogowski coil 10 and the voltmeter 11 are respectively and electrically connected with the ARM processor 14 through a signal processing module 12, the collector of the second IGBT switch module 6 is connected between the anode of a super capacitor 5 and the collector of the third IGBT switch module 8, the emitter of the second IGBT switch module 6 is connected with an arrester 7, the other end of the arrester 7 is connected with the output cathode of the rectifier module 3, the base of the second IGBT switch module 6 is electrically connected with the ARM processor 14 through the IGBT isolation driving circuit 13 .
The ARM processor 14 is respectively connected with a storage module 15, a calculation module 16 and a communication module 17.
A method for detecting dynamic contact resistance of a high-voltage circuit breaker is characterized by comprising the following steps:
firstly, a three-phase alternating current power supply 1 is input to an alternating current voltage regulator 2, alternating current is converted into direct current by a rectifier module 3, an output signal of an ARM processor 14 controls a first IGBT switch module 4 to be conducted by controlling an IGBT isolation driving circuit 13, the rectifier module 3 charges a super capacitor 5, and when a certain voltage is reached, the ARM processor 14 outputs a control signal to control the first IGBT switch module 4 to be turned off by controlling the IGBT isolation driving circuit 13;
secondly, the ARM processor 14 outputs signals to control the third IGBT switch module 8 to be conducted through the IGBT isolation driving circuit 13, the super capacitor 5 and the high-voltage circuit breaker 9 form a loop, the current flowing through the high-voltage circuit breaker 9 is measured through the Rogowski coil 10 during the switching operation of the high-voltage circuit breaker 9, and the voltages at two ends of the high-voltage circuit breaker 9 are measured through the voltmeter 11;
thirdly, a current signal which is measured by the Rogowski coil 10 and flows through the high-voltage circuit breaker 9 and a voltage signal which is measured by the voltmeter 11 are input into the ARM processor 14 through the signal processing module 12, the ARM processor 14 outputs the voltage signal to the calculation module 16, the calculation module 16 feeds back a calculation result to the ARM processor 14, the ARM processor 14 outputs the calculation result to the storage module 15, and meanwhile, the ARM processor 14 outputs the calculation result to the communication module 12;
and fourthly, after the test work is finished, an output signal of the ARM processor 14 controls the third IGBT switch module 8 to be switched off through the IGBT isolation driving circuit 13, then an output signal of the ARM processor 14 controls the second IGBT switch module 6 to be switched on through the IGBT isolation driving circuit 13, the super capacitor 5, the second IGBT switch module 6 and the lightning arrester 7 form an energy absorption loop, so that the residual current of the super capacitor is absorbed by the lightning arrester 7, and the residual voltage on the super capacitor is zero.
The dynamic contact resistance detection device for the high-voltage switch equipment provided by the invention adopts a dynamic contact resistance measurement loop of the rectification control module, the IGBT and the super capacitor to replace the traditional lead storage battery, so that the measurement loop is safer, and the accurate control of the detection circuit is realized. An energy absorption loop is designed in the dynamic resistance detection loop, and the burning loss of electronic elements of the measuring circuit is avoided by controlling the on-time of the IGBT, so that the stability of the field measuring loop is ensured, and the reliability and the stability of the device are improved. The Rogowski coil is adopted for measuring the loop resistance in the data monitoring and analyzing loop, and compared with a Hall sensor, the Rogowski coil is more accurate and effective in measuring result and higher in precision, and the accuracy and effectiveness of the dynamic resistance measuring result are guaranteed.
Claims (2)
1. A high-voltage circuit breaker dynamic contact resistance detection circuit comprises a three-phase alternating current power supply (1), an alternating current voltage regulator (2), a rectification module (3), an IGBT switch module, a super capacitor (5), a lightning arrester (7), a high-voltage circuit breaker (9), a Rogowski coil (10), an ARM processor (14) and a voltmeter (11), and is characterized in that the three-phase alternating current power supply (1) is connected with the input end of the alternating current voltage regulator (2), the output end of the alternating current voltage regulator (2) is connected with the input end of the rectification module (3), the collector of a first IGBT switch module (4) is connected with the output anode of the rectification module (3), the super capacitor (5) is connected in parallel between the emitter of the first IGBT switch module (4) and the output cathode of the rectification module (3), the base of the first IGBT switch module (4) is electrically connected with the ARM processor (14) through an IGBT isolation driving circuit (13), the positive electrode of the super capacitor (5) is connected with the collector electrode of a third IGBT switch module (8), the emitter electrode of the third IGBT switch module (8) is connected with one end of a high-voltage circuit breaker (9), the other end of the high-voltage circuit breaker (9) is connected with the output negative electrode of a rectifier module (3), the base electrode of the third IGBT switch module (8) is electrically connected with an ARM processor (14) through an IGBT isolation driving circuit (13), two ends of the high-voltage circuit breaker (9) are connected with a voltmeter (11) in parallel, a Rogowski coil (10) is arranged at the input end of the high-voltage circuit breaker (9), the Rogowski coil (10) and the voltmeter (11) are respectively and electrically connected with the ARM processor (14) through a signal processing module (12), the collector electrode of a second IGBT switch module (6) is connected between the positive electrode of the super capacitor (5) and the collector electrode of the third IGBT switch module (8), an arrester (7) is connected to an emitter of the second IGBT switch module (6), the other end of the arrester (7) is connected with the output negative electrode of the rectifier module (3), and the base of the second IGBT switch module (6) is electrically connected with the ARM processor (14) through an IGBT isolation driving circuit (13).
2. The dynamic contact resistance detection circuit of a high voltage circuit breaker according to claim 1, characterized in that a memory module (15), a calculation module (16) and a communication module (17) are connected to the ARM processor (14), respectively.
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| CN202020564785.6U CN212255491U (en) | 2020-04-16 | 2020-04-16 | Dynamic contact resistance detection circuit of high-voltage circuit breaker |
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| CN202020564785.6U CN212255491U (en) | 2020-04-16 | 2020-04-16 | Dynamic contact resistance detection circuit of high-voltage circuit breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308219A (en) * | 2020-04-16 | 2020-06-19 | 国网山西省电力公司电力科学研究院 | Dynamic contact resistance detection circuit of high-voltage circuit breaker |
| CN113447719A (en) * | 2021-07-21 | 2021-09-28 | 国网河北省电力有限公司检修分公司 | Detection device for contact surface resistance |
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2020
- 2020-04-16 CN CN202020564785.6U patent/CN212255491U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308219A (en) * | 2020-04-16 | 2020-06-19 | 国网山西省电力公司电力科学研究院 | Dynamic contact resistance detection circuit of high-voltage circuit breaker |
| CN113447719A (en) * | 2021-07-21 | 2021-09-28 | 国网河北省电力有限公司检修分公司 | Detection device for contact surface resistance |
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