Direct-current ground loss positioning method based on source-load conversion technology

Abstract

The invention provides a direct current ground loss positioning method based on a source-load conversion technology. The method comprises the following steps: S1, delimiting a circuit breaking method operation range in which a circuit breaking method needs to be used for positioning an ungrounded feeder line; S2, arranging a small source-load conversion power supply at an air switch of each branch feeder line within the operation range of the switching-off method, wherein when the source conversion power supply is inserted into the input end of the air switch, the load is a branch load in a charging state, and when the source-mint conversion power supply is inserted into the output end of the air switch, the branch back-up power supply is used for monitoring the voltage of the output end; S3, determining that the output end of the power supply air switch of each branch feeder is inserted with a source-load conversion power supply, then positioning the ground-uninsulation feeder of the direct current system by using a switching-off method, wherein the source-load conversion power supply outputs direct current to the output end of the air switch so as to supply power to the branch feeder when the air switch of the branch feeder is in a switching-off state due to the switching-off method operation. According to the invention, the DC ground-uninsulation feeder can be positioned under the condition of ensuring stable operation of the power grid device.

Description

technical field [0001] The invention relates to the technical field of power grid maintenance, in particular to a DC ground loss positioning method based on source-to-load conversion technology. Background technique [0002] With the continuous development of society, the power system has been widely used in my country's industrial production and daily life. Electric energy has become the main energy and power of modern industrial production. Ensuring high-quality and stable power supply is one of the priorities of power companies. . [0003] The DC system is an important system that supplies power to the control circuit, relay protection device and its outlet circuit of the substation. In large and medium-sized substations, due to the large number of main equipment being operated and protected, the DC system spreads all over the plant. However, due to the influence of bad weather and humid environment, the insulation of equipment or cables is reduced, and the DC system is p...

AI Technical Summary

Problems solved by technology

However, when multiple feeders lose ground at the same time in the DC system (the grounding resistance is too large), or the insulation inspection device fails, the operation and maintenance personnel can only determine the ground-lost feeder by "pull-out method".

However, to locate the feeders caused by ground loss through the "path-pull method", it is necessary to cut off the power supply of the feeders where the relay protection, measurement and control devices are located one by one, which seriously affects the safe and stable operation of the power system.

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