A logic system and device for a generator fault interlock trip stator cooling water pump

Abstract

The invention discloses a logic system and device for a generator fault interlocking and tripping stator cooling water pump. The soft logic is implemented in the distributed control system DCS of the generating set, and an interlocking stop action is added to the original logic of manually stopping the stator cooling water pump. signal, the interlock stop protection action signal controls the stop of the stator cooling water pump through the OR gate logic, and at the same time accesses the generator-transformer group protection action to close the main valve instruction, and sets a certain delay time through the delay module, and at the same time the new Adding a spare pump improves the redundancy of the entire water pump unit. The logic of the whole scheme is simple, without adding new equipment. When the generator fails, it prevents the generator from cooling water from entering, which plays a good role in protecting the generator and is beneficial to the later stage. Maintenance can also avoid malfunctions and improve the reliability of the entire logic system.

Description

technical field [0001] The invention relates to the technical field of generator equipment, in particular to a logic system and device for a generator fault interlock and trip stator cooling water pump. Background technique [0002] A generator refers to a mechanical device that converts other forms of energy into electrical energy. It is driven by a water turbine, steam turbine, diesel engine or other power machinery, and converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator. It is then converted into electrical energy by a generator. [0003] Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life. There are many forms of generators, but their working principles are all based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is: us...

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Problems solved by technology

[0005] However, when the generator is working, sometimes the generator fails due to external or internal reasons. When the generator fails, serious leakage of the generator may cause electrical protection actions such as grounding of the generator stator or even differential. After the protection action, the stator cooling water cannot be cut off in time, and the stator cooling water pump used for cooling continues to work, and it is easy to inject a large amount of cooling water into the generator, resulting in the expansion of the generator failure and causing great difficulties to the later equipment repair. ; and there is no accurate data for judging generator failures, and different or necessary measures cannot be taken according to different failure conditions of generators

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