Quick switching method of the transformation station power supply

Abstract

The invention relates to a fast switching method of a substation power supply. Firstly, the loop closing mode is determined; when the loop closing condition is satisfied, the designated circuit breaker for closing the loop is closed; After 0.1 to 0.5s, judge whether the power switch is successful according to the working position, current and voltage signals of the two-stage busbar of the circuit breaker designated for de-looping. The switchover is successful; the circuit breaker designated for de-looping is closed or the voltage on the two busbars is abnormal, and power is supplied after a delay of 0.5-2s, and the closing and de-looping ends. According to the set procedures and instructions, the invention enables the power supply to switch between closing and unblocking operations before the action of the relay protection device, so as to ensure the reliability of the power supply of the power grid, and can be used for fast switching of power supplies in various modes under the grid layered and partitioned operation.

Description

technical field [0001] The invention relates to a switching method of a power supply, in particular to a fast switching method of a substation power supply. Background technique [0002] With the rapid development of the power grid, the short-circuit capacity of the power grid is also increasing, and the short-circuit current of the power grid will exceed the rated breaking capacity of the circuit breaker, which is not allowed by the operation of the power grid. reduce the short-circuit current. However, after the power grid is operated in layers and partitions, the two incoming power sources of the substations of the lower power grid may come from different areas of the power grid. In the process of switching the power supply and closing the loop, there will be a large loop closing current, which may exceed the limit allowed by the setting of the relay protection device, and even cause incorrect action of the relay protection device. Most of the hierarchical partitions ar...

AI Technical Summary

Problems solved by technology

The traditional power switching is performed by special calculations first, and the operator performs the operation in the order of first closing and then breaking. This kind of manual operation has a large workload and long operating time. It can only be used for the operation mode of the power grid in the same area. power switching between

At present, for the switching of the power supply in the hierarchical and partitioned operation of the power grid, the circuit breaker of the main power supply is manually opened, and then the circuit breaker of the backup power supply is closed to perform "cold", because this switching of the power supply will cause a short-term external power outage , which affects the reliability of the grid power supply

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