Unit protection tripping apparatus of power plant based on 3/2 wiring condition

Abstract

The invention relates to the technical field of unit protection of a power plant, and provides a unit protection tripping apparatus of the power plant based on a 3 / 2 wiring condition. According to theapparatus, a first generation-transformer unit protection device, a first unit outlet of a generation-transformer unit non-electric quantity protection device, a first high-voltage start standby transformer protection device, and a first unit outlet of a high-voltage start standby transformer non-electric quantity protection device are all electrically connected with a first optical fiber transmission module, the first optical fiber transmission module is connected with a third optical fiber transmission module in a communication manner, and the third optical fiber transmission module is separately and electrically connected with a first channel tripping loop TJR contact of a generation-transformer unit high-voltage breaker control box and a first channel tripping loop TJR contact of a high-voltage start standby transformer breaker control box. According to the apparatus, the structure is reasonable and compact, the usage is convenient, the problem of unit mal-tripping caused by an over-long tripping cable from the generation-transformer unit protection device to the breaker control box is solved by employing optical fiber communication, and the tripping loop is free of the influences of the length of the cable distance and direct current one-point grounding or alternating current entrance.

Description

technical field [0001] The invention relates to the technical field of unit protection in power plants, and relates to a tripping device for unit protection in power plants based on 3 / 2 connection conditions. Background technique [0002] In the power plant with 3 / 2 connection mode, the circuit breaker operation box is arranged in the protection room of the booster station, and the distance between the protection room of the booster station network and the unit is relatively long. The tripping of the unit protection is generally to connect the action outlet of the unit protection to the TJR relay of the circuit breaker operation box to realize tripping. During this process, many accidental tripping incidents of units that often occurred in China showed that most of them were caused by too long trip cables from the protection device of the generator-transformer unit to the operation box of the circuit breaker, and the secondary trip cables from the protection device of the ge...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a unit protection tripping device based on a 3 / 2 connection condition power plant, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of the generator-transformer protection device in a power plant with a 3 / 2 connection mode. The trip cable to the circuit breaker operation box is too long, which may easily lead to the problem of false tripping of the unit

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