Region screening method of alternating current short-circuit test

Abstract

The present invention discloses a region screening method of an alternating current short-circuit test. The method comprises a step A of counting alternating current circuits connected with a target plant station and denoting a region formed by the alternating current circuits as a first test fault point region; a step B of calculating corresponding load busbar voltage data of the alternating current circuits in a short-circuit fault within the first test fault point region; a step C of judging if any satisfactory alternating current circuit region exists according to the load busbar voltage data; if not, adjusting an operating method of a near-region power grid and returning back to the step B; and if does, denoting the satisfactory alternating current circuit region as a second test fault point region; and a step D of judging again according to topographic and environmental information; if not, adjusting an operating method of a near-region power grid and returning back to the step B; and if does, determining the satisfactory region as an actual test fault point region. With adoption of the above technical scheme, a load low-pressure trip risk during the alternating current short-circuit test can be reduced, and normal power utilization at the user side is guaranteed.

Description

technical field [0001] The invention relates to the field of power system simulation and calculation analysis, in particular to an area screening method for an AC short circuit test. Background technique [0002] Short circuit refers to the occurrence of a path between all abnormal phases or phases and ground (for neutral grounded systems). The causes of the short circuit mainly include: aging of insulating materials, defects of the equipment itself, harsh weather conditions, man-made accidents such as pulling the switch with load, and other factors such as birds and animals jumping over the exposed current-carrying wires. Short-circuit faults can disrupt the normal operation of the power system. When the system voltage is greatly reduced during a short circuit, it will have a great impact on users with high power quality requirements, and may even cause low-voltage tripping of the load, which is one of the main hazards of short-circuit faults. [0003] However, in order t...

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Problems solved by technology

From the perspective of self-interest, users do not want such experiments to affect normal production and life; from the perspective of social impact, power companies do not want such experiments to damage their own image and increase the pressure of public opinion on enterprises

For artificial AC short-circuit tests that have a large impact on the power grid, the user side is mainly reflected in voltage drop or even load low-voltage tripping. However, when power companies formulate AC short-circuit test plans, they generally seldom consider the low-voltage on the user side. Trip risk, and has not formed a set of effective methods and processes to reduce and avoid such risks

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