Combined optimization method of protection blocking based on busbar protection and fast switching device for high-rise plant

Abstract

The invention discloses a combined optimization method for protection locking based on busbar protection and quick-cutting device for high power plants, which belongs to the field of relay protection for power plant generator-transformer units. Solve the defect that the quick-cut device cannot be locked after the protection action of the high-voltage plant busbar, causing the quick-cut device to close the high-voltage backup circuit breaker to the faulty busbar. In this method, the secondary tripping circuits of the high-voltage working incoming line circuit breaker and the high-voltage standby incoming line circuit breaker for busbar protection are firstly optimized and transformed, and the closing command of the high-voltage standby incoming line circuit breaker of the blocking fast-cutting device after the busbar protection action is realized and self-maintained ; At the same time, optimize the abnormal voltage blocking logic of the fast switching device, and increase the bus fault judgment logic to block the fast switching device. The invention only needs to add a small amount of secondary equipment and reform part of the circuit, and modify the software logic and fixed value of the fast cutting device to realize it, which is simple and easy.

Description

technical field [0001] The invention belongs to the field of relay protection for generating and transforming groups in power plants, and relates to an optimization method for a power plant power system bus protection action blocking power plant fast switching system, specifically a protection lock based on a high power plant bus protection and fast switching device joint optimization method. Background technique [0002] The high-voltage busbars used in power plants are generally connected in sections with a single busbar enclosed in a common box according to the unit, and the operation mode is not grounded. Each section of high-voltage service busbar is equipped with a set of quick switching devices for fast switching between high-voltage service power supply and high-voltage backup power supply. [0003] The high-voltage utility power fast switching device of the power plant (referred to as the fast switching device) is an important device to ensure that the power system...

AI Technical Summary

Problems solved by technology

[0014] Aiming at the mismatch between busbar protection and quick-cut device protection, the present invention provides a joint optimization method for protection locking based on high-voltage factory-use busbar protection and quick-cut device, which is used to solve the problem that the high-voltage factory-use busbar protection cannot be blocked after the quick-cut device is activated. Causes the snap-off device to close the high-voltage backup circuit breaker to the faulty busbar defect

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