CN210803604U - High-voltage circuit breaker contact life evaluation device - Google Patents
High-voltage circuit breaker contact life evaluation device Download PDFInfo
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- CN210803604U CN210803604U CN201920761773.XU CN201920761773U CN210803604U CN 210803604 U CN210803604 U CN 210803604U CN 201920761773 U CN201920761773 U CN 201920761773U CN 210803604 U CN210803604 U CN 210803604U
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Abstract
The utility model discloses a high voltage circuit breaker contact life-span evaluation device, including data acquisition system, still including the test power supply case, the test power supply case includes farad electric capacity, and farad electric capacity one end is connected with the moving contact of circuit breaker through first wire, and the farad electric capacity other end passes through power switch to be connected with the static contact of circuit breaker, and power switch's control end is connected with data acquisition system, and the moving contact is connected with insulating connecting rod, is provided with the magnetic grid chi on the insulating connecting rod, still current sensor, voltage sensor and magnetic grid chi sensor. The utility model has convenient measurement; the service life of the high-voltage circuit breaker contact can be conveniently and quickly evaluated, and the method is convenient and quick.
Description
Technical Field
The utility model relates to a high voltage circuit breaker test technical field, concretely relates to high voltage circuit breaker contact life-span evaluation device of power system 10kV and above.
Background
In a high-voltage transmission link, a high-voltage circuit breaker is extremely important electrical equipment, and the ablation degree of a contact of the high-voltage circuit breaker is directly related to the operation safety of the high-voltage circuit breaker, so that the operation reliability of the whole transmission line is related.
The traditional measurement of the ablation degree of the contact of the high-voltage circuit breaker generally uses a loop resistance tester to measure the static contact resistance of the main contact of the circuit breaker in the switching-on state of the circuit breaker, and when the static contact resistance is within a qualified range, the contact of the circuit breaker is considered to have no obvious ablation, and the state of the contact of the circuit breaker is good. According to market research, the explosion of the circuit breaker occurs in the switching-on or switching-off process of the circuit breaker every year, but not in the static operation process of the circuit breaker.
When the high-voltage circuit breaker is switched on and switched off, electric arcs are generated between the fixed contact and the moving contact of the fracture, and the electric arcs can cause ablation on the surfaces of the fixed contact and the moving contact of the circuit breaker, so that a large dynamic contact resistance is generated. As the breaker is subjected to opening and closing for many times, toxic fluoride gas with high content exists in an arc extinguish chamber where a fracture of the breaker is located, and dust is also abundant, once the arc extinguish chamber is opened for inspection, the decomposers quickly absorb moisture and turn grey, and the decomposers are firmly adhered to various parts of the arc extinguish chamber like cement. Opening the arc chute to detect the contact performance of the circuit breaker is clearly not an optimal approach.
It is seen that it is important to measure the dynamic contact resistance of the circuit breaker by using a suitable measurement method and to evaluate the lifetime of the contacts of the high voltage circuit breaker based on the contact resistance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high voltage circuit breaker contact life-span evaluation device to the defect that prior art exists.
The utility model discloses a following technical scheme realizes:
the utility model provides a high voltage circuit breaker contact life-span evaluation device, including the data acquisition system, still include the test power supply box, the test power supply box includes farad capacitor, farad capacitor one end is connected with the moving contact of circuit breaker through first wire, the farad capacitor other end passes through power switch and is connected with the static contact of circuit breaker, power switch's control end is connected with the data acquisition system, the moving contact is connected with insulating connecting rod, be provided with the magnetic grid chi on the insulating connecting rod, still include the current sensor who is used for measuring the electric current through static contact and moving contact, a voltage sensor who is used for measuring the voltage between static contact and moving contact, and with the magnetic grid chi adaptation and be used for measuring the magnetic grid chi sensor of insulating connecting rod displacement, current sensor, voltage sensor and magnetic grid chi sensor are connected with the.
Compared with the prior art, the utility model, following beneficial effect has:
the measurement is convenient, the circuit breaker is not required to be disassembled, the current signal, the voltage signal, the corresponding stroke and the time can be measured on line, and the service state of the circuit breaker can be evaluated; unnecessary power failure caused by blind disassembly of the arc extinguish chamber of the circuit breaker is avoided, waste of manpower and financial resources is reduced, and reliability of high-voltage power transmission is improved.
Drawings
Fig. 1 is a block diagram of the testing principle of the present invention.
Detailed Description
To facilitate understanding and practice of the invention by those of ordinary skill in the art, the following detailed description of the invention is provided in connection with the examples, and it is to be understood that the examples described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
The utility model provides a high voltage circuit breaker contact life-span evaluation device, including the data acquisition system, a serial communication port, still include the test power supply box, the test power supply box includes farad capacitor, farad capacitor one end is connected with the moving contact of circuit breaker through first wire, the farad capacitor other end passes through power switch and is connected with the static contact of circuit breaker, power switch's control end is connected with the data acquisition system, the moving contact is connected with insulating connecting rod, be provided with the magnetic grid chi on the insulating connecting rod, still including the current sensor who is used for measuring the electric current through static contact and moving contact, the voltage sensor who is used for measuring the voltage between static contact and the moving contact, and with the magnetic grid chi adaptation and be used for measuring the magnetic grid chi sensor of insulating connecting rod displacement, current sensor, voltage sensor and magnetic grid chi sensor are connected.
In fig. 1, a contact finger G of a circuit breaker is fixed at the front end of a fixed contact F of the circuit breaker, and an arc contact H of the circuit breaker is fixed at the front end of a movable contact I of the circuit breaker. The movement direction L represents the opening direction of the circuit breaker, and the movement direction M represents the closing direction. In the closing process of the circuit breaker, the movable contact I moves towards the closing direction (the movement direction M) under the driving of the circuit breaker operating mechanism, the static contact F is inserted into the hollow arc contact H and is not contacted with the arc contact H, the contact finger G is contacted with the arc contact H before the static contact F is contacted with the movable contact I, and the closing process is completed. When the brake is opened, the operating mechanism drives the moving contact I to move towards the brake opening direction (movement direction L), after the moving contact I is separated from the static contact F, the contact finger G is contacted with the arc contact H, and then the contact finger G is separated, so that the brake opening process is completed.
The magnetic grid ruler A is fixed on the insulating connecting rod J, the insulating connecting rod J is fixed on the moving contact I of the circuit breaker, in the switching-on and switching-off processes of the circuit breaker, the magnetic grid ruler A and the moving contact I run synchronously, and the data acquisition system reads the moving contact stroke and time of the circuit breaker acquired by the magnetic grid ruler sensor B in real time.
The test power box comprises a large-capacity farad capacitor C and a power switch D. The power switch D is controlled by the data acquisition system to be opened or closed, and the high-capacity farad capacitor C is loaded on the fixed contact F and the moving contact I of the circuit breaker through the power switch D. The current sensor E measures current passing through the static contact F and the moving contact I, the data acquisition system receives current signals acquired by the current sensor E and also acquires voltage signals between the static contact F and the moving contact I through the voltage sensor, and in the switching-on and switching-off processes of the circuit breaker, the data acquisition system reads the current signals acquired by the current sensor E in real time and the voltage signals transmitted by the voltage sensor.
The service life of the circuit breaker can be evaluated through the current signals, the voltage signals and the corresponding time, the division unit in the data acquisition system receives the voltage signals and the current signals, the division unit obtains the contact resistance according to the voltage signals and the current signals, then the data of the contact resistance and the corresponding moving contact stroke are obtained, and the service life of the circuit breaker can be evaluated through the data of the contact resistance and the corresponding moving contact stroke.
Furthermore, a relation curve between the contact resistance and the moving contact stroke can be drawn, the moving contact stroke corresponds to the abscissa of the relation curve between the contact resistance and the moving contact stroke, the ordinate of the relation curve between the contact resistance and the moving contact stroke corresponds to the contact resistance of the moving contact stroke, and if the change of the follow-up contact stroke is caused, the curve is more abrupt and smoother, and the service life of the circuit breaker is shorter.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (1)
1. The utility model provides a high voltage circuit breaker contact life-span evaluation device, including the data acquisition system, a serial communication port, still include the test power supply box, the test power supply box includes farad capacitor, farad capacitor one end is connected with the moving contact of circuit breaker through first wire, the farad capacitor other end passes through power switch and is connected with the static contact of circuit breaker, power switch's control end is connected with the data acquisition system, the moving contact is connected with insulating connecting rod, be provided with the magnetic grid chi on the insulating connecting rod, still including the current sensor who is used for measuring the electric current through static contact and moving contact, the voltage sensor who is used for measuring the voltage between static contact and the moving contact, and with the magnetic grid chi adaptation and be used for measuring the magnetic grid chi sensor of insulating connecting rod displacement, current sensor, voltage sensor and magnetic grid chi sensor are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761773.XU CN210803604U (en) | 2019-05-24 | 2019-05-24 | High-voltage circuit breaker contact life evaluation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761773.XU CN210803604U (en) | 2019-05-24 | 2019-05-24 | High-voltage circuit breaker contact life evaluation device |
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| Publication Number | Publication Date |
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| CN210803604U true CN210803604U (en) | 2020-06-19 |
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| CN201920761773.XU Active CN210803604U (en) | 2019-05-24 | 2019-05-24 | High-voltage circuit breaker contact life evaluation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133408A (en) * | 2019-05-24 | 2019-08-16 | 武汉大洋义天科技股份有限公司 | A kind of High Voltage Circuit Breaker Contacts life appraisal device and method |
| CN114019366A (en) * | 2021-11-05 | 2022-02-08 | 苏州迪芬德物联网科技有限公司 | Electrical component contact loss evaluation method |
-
2019
- 2019-05-24 CN CN201920761773.XU patent/CN210803604U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133408A (en) * | 2019-05-24 | 2019-08-16 | 武汉大洋义天科技股份有限公司 | A kind of High Voltage Circuit Breaker Contacts life appraisal device and method |
| CN114019366A (en) * | 2021-11-05 | 2022-02-08 | 苏州迪芬德物联网科技有限公司 | Electrical component contact loss evaluation method |
| CN114019366B (en) * | 2021-11-05 | 2024-01-16 | 苏州迪芬德物联网科技有限公司 | Electrical component contact loss evaluation method |
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