Backup protection method for water machine of giant hydroelectric generating set

Abstract

The invention discloses a water turbine backup protection method for a giant hydroelectric generating set, and belongs to the technical field of backup protection of hydroelectric generating sets. According to the detected action that an upper guide shoe temperature shutdown counter is larger than 1, an upper guide shoe temperature over-high protection connecting piece is put in, a thrust shoe temperature shutdown counter is larger than 1, a thrust shoe temperature over-high protection connecting piece is put in, a lower guide shoe temperature shutdown counter is larger than 1, a lower guide shoe temperature over-high protection connecting piece is put in, and a lower guide shoe temperature shutdown counter is larger than 1. When the conditions such as the action of a mechanical overspeed travel switch, the action of a mechanical overspeed hydraulic travel loop and the input of a mechanical overspeed protection connecting piece are detected, program condition judgment is fully utilized, and a scientific and reasonable process is used for executing the backup protection shutdown of the water machine of the giant hydroelectric generating set; potential hidden dangers of backup protection of a traditional water machine relay are eliminated.

Description

technical field [0001] The invention belongs to the technical field of water machine backup protection of a hydroelectric unit, and in particular relates to a water machine backup protection method for a giant hydroelectric unit. Background technique [0002] At present, the automatic control systems of giant hydro-generator units are realized by using digital devices such as programmable logic controllers to form local control units. When the local control unit fails to work normally or in a specific accident situation, the water turbine backup protection system controls the accident shutdown of the unit. Usually, the water turbine backup protection system is conventionally realized by a relay circuit. The backup protection of the water turbine generator set is a The last important protection barrier for the safe operation of giant hydropower stations is to reduce the occurrence of major equipment and facility failures, and reduce the risk of flooding the powerhouse. high ...

AI Technical Summary

Problems solved by technology

When the local control unit fails to work normally or in a specific accident situation, the emergency shutdown of the unit is controlled by the backup protection system of the hydraulic unit. Usually, the backup protection system of the hydraulic unit is usually implemented by a relay circuit. The backup protection of the hydro-generator set is The last important protective barrier for the safe operation of giant hydropower stations reduces the occurrence of major equipment and facility failures and reduces the risk of flooding the plant. The reliability of the backup protection of the water machine is very important. The scalability of the traditional relay circuit is poor, and malfunctions and refusal to operate High risk, poor signal traceability and other disadvantages

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