Quick switching method of the transformation station power supply

Abstract

The invention relates to a fast switching method of transformer substation power, Firstly defining a combined ring manner; if the combined ring condition is satisfied, designating the switch-on of the combined ring breaker; if the unlink ring condition is satisfied, designating the tripping operation of the unlink ring breaker; judging whether the power switching has succeeded according to the operating position and current of the designated unlink ring breaker, and two bus voltage signals after a delay time of 0.1-0.5s; if the designated unlink ring breaker skips position without current, and the two bus voltages are normal, the power switching succeeds; if the designated unlink ring breaker is on and the two bus voltages are abnormal, it supplies prover after a delay time of 0.5-2s and the combined ring has finished. The invention carries out the combined ring operation switch of the power supply according to the designed instruction and program before the action of the relay protective device, so as to guarantee the reliability of the electrical network supply, which may be used in various forms of power fast switchings under the layered partition operation of the electrical network.

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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