Auxiliary device and method for quickly checking SF6 density relay without disassembly

Abstract

The invention provides an auxiliary device and method for quickly checking an SF6 density relay without disassembly, and relates to the technical field of SF6 density relay check. The auxiliary devicecomprises a first control unit, a voltage measuring module and a first relay. The method comprises the steps that voltages at both ends of the density relay to be tested are tested, and tested voltage values are sent to the control unit; the control unit judges the on-off state of a contact of the density relay to be tested through the received voltage values, and sends a control signal to a relay with a passive output contact according to the on-off state of the contact; and the relay sends the on-off state signal of the contact to a density relay calibrator in a passive mode, and the density relay calibrator feeds back a test value in a conventional mode. According to the auxiliary device for quickly checking the SF6 density relay without disassembly, the state of the electrified contact can be converted into the non-electrified contact, the function of transmitting the state signal of the electrified contact is realized, and the purpose of electrified checking of the density relaywithout disassembly can be realized.

Description

【Technical field】 [0001] The invention relates to the technical field of calibration of SF6 density relays, in particular to an auxiliary device and an auxiliary testing method for rapid calibration of SF6 density relays without disassembly. 【Background technique】 [0002] According to the relevant regulations for circuit breaker maintenance, the following tasks need to be carried out during circuit breaker maintenance: (1) Check the SF6 density relay of the circuit breaker, check the function of alarming and blocking of the gas density relay and the corresponding pressure action value; (2) Hydraulic type The circuit breaker also needs to check and verify the action of the circuit breaker pressure switch, such as the pressure value of nitrogen leakage alarm, oil pump start, oil pump stop, reclosing lock, closing lock and opening lock. [0003] When carrying out the above work, there are the following problems: [0004] (1) SF6 circuit breaker density relay calibration [0...

AI Technical Summary

Problems solved by technology

[0005] In on-site maintenance, the existing SF6 density relay calibrator requires testing in a non-charged state or maintenance in the case of disconnection, which has the following disadvantages: ① If the measurement and control power supply is disconnected, other professional teams may need to control and measurement and control power supply, must The degree will affect the work of the rest of the team and reduce the overall work efficiency

②There is an oil film between the contacts of some models of density relays, and the on-off condition needs to be detected under the condition of electrification. If there is no voltage, the instrument cannot correctly detect the on-off condition of the contacts and cannot perform measurement

③If the power is cut off, only the contact action of a single density relay body can be detected, and the function of the switch SF6 low-pressure locking circuit cannot be verified as a whole.

[0008] ①Because the oil pressure gauge is installed in separate phases, the oil pressure alarm and blocking relay are all concentrated in the control box. Therefore, the two operators who complete the work belong to different work locations, and it is impossible to achieve completely seamless cooperation

After the reaction time of the two people, the pressure value reading will often lag behind and not be accurate enough

[0009] ② There are other working surfaces on site, and sometimes the existence of other sounds will affect the communication between the two, and there are cases where action points are missed, which needs to be repeated, which affects work efficiency

[0010] In view of the above-mentioned problems that the instrument does not have the live detection function and the distance between the signal and the pressure control point is inconvenient to communicate, which leads to the problems of low work quality and efficiency, it is necessary to improve the existing SF6 density relay calibrator

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