CN105467218A - Contact resistance testing method of circuit breaker used for short-circuit protection - Google Patents

Contact resistance testing method of circuit breaker used for short-circuit protection Download PDF

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Publication number
CN105467218A
CN105467218A CN201510764307.3A CN201510764307A CN105467218A CN 105467218 A CN105467218 A CN 105467218A CN 201510764307 A CN201510764307 A CN 201510764307A CN 105467218 A CN105467218 A CN 105467218A
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CN
China
Prior art keywords
fracture
contact resistance
current
tested
circuit breaker
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Pending
Application number
CN201510764307.3A
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Chinese (zh)
Inventor
吴平
谢成益
吴雪芹
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Wenzhou University
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Wenzhou University
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Publication date
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Priority to CN201510764307.3A priority Critical patent/CN105467218A/en
Publication of CN105467218A publication Critical patent/CN105467218A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08Measuring resistance by measuring both voltage and current
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers

Abstract

The invention relates to the technical field of performance testing of a circuit breaker used for short-circuit protection, and specifically relates to a contact resistance testing method of the circuit breaker used for short-circuit protection. The method comprises the following steps of: firstly, in a testing loop, connecting a plurality of fractures of a tested circuit breaker in series, and leading out connection terminals on two ends of the fractures connected in series, and connecting the connection terminals to a current signal sampling module; secondly, arranging a plurality of paths of voltage signal collection modules, connecting two ends of each path of voltage signal collection module to two ends of each tested fracture; and thirdly, connecting a constant current switch power supply in the testing loop, and calculating the contact resistance of each tested fracture according to sampled values of the current signal sampling module and the voltage signal collection modules. According to the invention, the wire connection and disconnection workload in the testing process of the plurality of fractures is reduced, the operation is convenient, the workload is reduced, and the working efficiency is improved.

Description

Circuit breaker contact persistence method of testing is used in short circuit protection
Technical field
Short circuit protection isolating switch technical field of performance test of the present invention, is specifically related to a kind of short circuit protection circuit breaker contact persistence method of testing.
Background technology
Isolating switch is control and protection equipment important in electric system, and it has direct impact to the safety of system, economical operation.Breaker fracture contact resistance refers to the contact resistance between the dynamic and static contact of isolating switch, and because the surface of contact of conductor is because of a variety of causes such as oxidation, sulfurations, make contact exists thin film, this film makes the resistance of contact area increase; Due to the existence of this contact resistance, during breaker electrifying, the temperature of contact position raises, and adds loss during breaker electrifying; Current capacity when contact resistance directly has influence on normal operation of circuit breaker in addition, and affect the ability of cutting-off of short-circuit electric current to a certain extent.Therefore, contact resistance is excessive, has both affected the reliability of isolating switch work, again reduces the serviceable life of isolating switch, impact safety in production.The test of breaker fracture contact resistance is very important.
The method measuring breaker fracture contact resistance generally adopts voltage drop method, in tested loop, when passing to DC current, breaker fracture contact resistance will produce pressure drop, measure by the voltage drop on the current value in loop and tested loop, calculate contact resistance according to Ohm law.
In traditional method, when carrying out breaker fracture contact resistance testing experiment, drawing p-wire at tested fracture two ends, being connected in voltage signal, current signal detecting device, test both opens device fracture contact resistance.Be typically provided with multiple stage isolating switch due to transformer station and there is multi-break isolating switch, often test a phase breaker fracture contact resistance, need to pull down isolating switch two terminated line, p-wire is received next tested fracture two ends, connecting test line, to proving installation, carries out the contact resistance testing fracture.When multiple breaker fracture resistance needs to measure, wiring and complex operation of taking out stitches, workload is large.
In traditional method, the degree of accuracy of breaker fracture contact resistance test cannot be held, general broadly by the method for repetitive measurement, reduce measuring error, but in the system for multiple isolating switch, taken multiple measurements by the fracture of each isolating switch blindly, waste a lot of manpower and materials, work efficiency is low.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, the short circuit protection circuit breaker contact persistence method of testing provide a kind of step that simplifies the operation, reducing workload, improve measuring accuracy, increase work efficiency.
For achieving the above object, a kind of short circuit protection circuit breaker contact persistence method of testing of the present invention's design, comprises the following steps:
(1), in test loop, be connected in series by multiple for tested isolating switch fracture, connection terminal is drawn at the fracture two ends after being connected in series, and is connected to current signal sampling module;
(2), plurality of voltages signal acquisition module is set, the two ends of each road voltage signal acquisition module are connected respectively to each tested fracture two ends;
(3), in test loop access constant-current switch power source, according to the sampled value of current signal sampling module and voltage signal acquisition module, calculate the contact resistance value of each tested fracture.
Further, arrange two constant-current switch power sources, its electric current is respectively 100A, 200A, measure the contact resistance of multiple fracture at twice, twice measured value is used for the contact resistance value of same fracture in longitudinal comparison series loop, when there is the larger fracture of different resistive values, remeasures, two groups of constant-current switch power sources, real-time follow-up is tested, and when there is the larger fracture of different resistive values, remeasures the contact resistance value of this fracture, reduce the scope remeasured, improve the efficiency of measurement.
Closer, display panels is accessed in test loop, the sampled value of display current signal sampling module and voltage signal acquisition module, when showing current value and constant-current switch power source output current is unequal, corrected by panel currents fine setting, the current value of display panels Real Time Observation display, can compare with constant current source output current, when displayed value and constant current source output current value are not inconsistent, adjustment display panel is until when being consistent with constant current source output current, what show display panel is shown as exact value, so shown magnitude of voltage is also the accurate magnitude of voltage in fracture two ends in measuring circuit, to correct the degree of accuracy of display panel in real time, guarantee that the fracture voltage measured is exact value, thus ensure that measuring accuracy.
Multiple fracture is connected in series by the present invention, multiple breaker fracture contact resistance is measured simultaneously, without the need to after often testing a phase breaker fracture contact resistance, take wiring apart, connect on next phase fracture again, multiple fracture contact resistance can be tested simultaneously, primary connection can complete the test of multiple breaker fracture contact resistance, decrease wiring when multiple fracture is tested, the workload of taking out stitches, simple operation, alleviate workload, save time, the test job of multiple breaker fracture contact resistance can be completed like this under same test condition, reduce the error brought because test parameter is different.
The present invention arranges two constant-current switch power sources, and real-time follow-up is tested, and when there is the larger fracture of different resistive values, remeasures the contact resistance value of this fracture, reduces the scope remeasured, improve the efficiency of measurement; In test loop, access display panels, according to the measuring circuit current value of display, correct the degree of accuracy of display panel, guarantee that the fracture voltage measured is exact value, thus ensure that measuring accuracy, the measuring accuracy of whole test process is high, measures efficiency high.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram that multiple breaker fracture contact resistance of the present invention is measured simultaneously;
In figure: the tested breaker fracture of 1-first, the tested breaker fracture of 2-second, the tested breaker fracture of 3-the 3rd, the double-end wiring of 4-tested breaker fracture contact resistance, 5-current sample module, 6-voltage sample module, 7-constant-current switch power source, 8-display panels.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Circuit breaker contact persistence method of testing is used in short circuit protection, comprises the following steps:
(1), in test loop, by tested isolating switch as shown in Figure 1 three fractures: the tested breaker fracture 2 of the first tested breaker fracture 1, second, the 3rd tested breaker fracture 3, to be connected in series, connection terminal is drawn at fracture two ends after being connected in series, is connected to current signal sampling module 5;
(2), plurality of voltages signal acquisition module 6 is set, the two ends of each road voltage signal acquisition module 6 is connected respectively to the two ends of the tested breaker fracture 2 of the first tested breaker fracture 1, second, the 3rd tested breaker fracture 3;
(3), in test loop, access constant-current switch power source 7, according to the sampled value of current signal sampling module 5 and voltage signal acquisition module 6, calculate the contact resistance of each tested fracture.
Two constant-current switch power sources 7 are set, its electric current is respectively 100A, 200A, measure the contact resistance of multiple fracture at twice, twice measured value is used for the contact resistance value of same fracture in longitudinal comparison series loop, when there is the larger fracture of different resistive values, remeasure the contact resistance value of this fracture.
In test loop, accessing display panels 8, the sampled value of display current signal sampling module and voltage signal acquisition module, when showing current value and constant-current switch power source output current is unequal, being corrected by panel currents fine setting.According to the measuring circuit current value of display, correct the degree of accuracy of display panel, guarantee that the fracture voltage measured is exact value, thus ensure that measuring accuracy.
Adopt breaker fracture contact resistance method of testing of the present invention, can test the short mouth contact resistance of multiple isolating switch simultaneously, the wiring workload of taking out stitches when decreasing single test, simple operation, saves time.
The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.

Claims (3)

1. circuit breaker contact persistence method of testing is used in short circuit protection, it is characterized in that comprising the following steps:
(1), in test loop, be connected in series by multiple for tested isolating switch fracture, connection terminal is drawn at the fracture two ends after being connected in series, and is connected to current signal sampling module;
(2), plurality of voltages signal acquisition module is set, the two ends of each road voltage signal acquisition module are connected respectively to each tested fracture two ends;
(3), in test loop access constant-current switch power source, according to the sampled value of current signal sampling module and voltage signal acquisition module, calculate the contact resistance value of each tested fracture.
2. short circuit protection circuit breaker contact persistence method of testing according to claim 1; it is characterized in that: two constant-current switch power sources are set; its electric current is respectively 100A, 200A; measure the contact resistance of multiple fracture at twice; twice measured value is used for the contact resistance value of same fracture in longitudinal comparison series loop; when there is the larger fracture of different resistive values, remeasure the contact resistance value of this fracture.
3. short circuit protection circuit breaker contact persistence method of testing according to claim 2; it is characterized in that: in test loop, access display panels; the sampled value of display current signal sampling module and voltage signal acquisition module; when showing current value and constant-current switch power source output current is unequal, corrected by panel currents fine setting.
CN201510764307.3A 2015-11-05 2015-11-05 Contact resistance testing method of circuit breaker used for short-circuit protection Pending CN105467218A (en)

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Application Number Priority Date Filing Date Title
CN201510764307.3A CN105467218A (en) 2015-11-05 2015-11-05 Contact resistance testing method of circuit breaker used for short-circuit protection

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Application Number Priority Date Filing Date Title
CN201510764307.3A CN105467218A (en) 2015-11-05 2015-11-05 Contact resistance testing method of circuit breaker used for short-circuit protection

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109283395A (en) * 2018-11-30 2019-01-29 中国科学院上海微系统与信息技术研究所 A kind of multichannel resistance test system and its test method
CN110907703A (en) * 2019-11-19 2020-03-24 国网江苏省电力有限公司南通供电分公司 Online monitoring method for contact resistance of high-voltage loop
CN111521874A (en) * 2020-05-11 2020-08-11 广东电网有限责任公司东莞供电局 Loop resistance testing method and device for static contact of isolating switch

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN203069672U (en) * 2013-01-29 2013-07-17 厦门国毅科技有限公司 Loop resistance testing system
CN103630747A (en) * 2012-08-24 2014-03-12 欧米克朗电子仪器有限公司 Method and apparatus for the measurement of a resistance of a switching contact of an electrical circuit breaker

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN103630747A (en) * 2012-08-24 2014-03-12 欧米克朗电子仪器有限公司 Method and apparatus for the measurement of a resistance of a switching contact of an electrical circuit breaker
CN203069672U (en) * 2013-01-29 2013-07-17 厦门国毅科技有限公司 Loop resistance testing system

Non-Patent Citations (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109283395A (en) * 2018-11-30 2019-01-29 中国科学院上海微系统与信息技术研究所 A kind of multichannel resistance test system and its test method
CN110907703A (en) * 2019-11-19 2020-03-24 国网江苏省电力有限公司南通供电分公司 Online monitoring method for contact resistance of high-voltage loop
CN111521874A (en) * 2020-05-11 2020-08-11 广东电网有限责任公司东莞供电局 Loop resistance testing method and device for static contact of isolating switch

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Application publication date: 20160406