Substation direct-current power source system

Abstract

The invention relates to a direct-current power source system for supplying power for the relay protection, automatic device and remote communication device of a substation and protection of the direct-current power source system, in particular, a substation direct-current power source system with a grounding fault automatic inspection function. The substation direct-current power source system includes an inspection control module, a direct-current busbar detection module connected with the output end of the inspection and control module, a direct-current branch detection module and a line selection verification module; fault feature identification is carried out according to the state quantity of current before and after a fault, the state quantity of voltage before and after the fault and the calculation quantity of grounding resistance, and electrical connections among the state quantity of current, the state quantity of voltage and the calculation quantity of grounding resistance; a line selection verification function is integrated onto the substation direct-current power source system with a grounding inspection line selection verification mechanism through adopting a logical event driving-based automatic inspection mode; and zero drift and fault branches can be identified through calling an unbalanced bridge mode and based on logical judgment, and therefore, wrong selection or missed selection of direct-current grounding inspection devices can be fast identified.

Description

technical field [0001] The invention relates to a DC power supply system and its protection for relay protection, automatic devices, and telecontrol communication devices of substations, in particular to a substation DC power supply system, in particular to a substation DC power supply with the function of automatic inspection of ground faults system. Background technique [0002] The DC power supply system is one of the three hidden projects in the substation. As an important part of the power system, the DC power supply provides uninterrupted power supply for some important conventional loads, relay protection and automatic devices, telecontrol communication devices, and provides emergency lighting. power supply. A point of grounding occurs in the DC power system, no short-circuit current will be generated, and the system can continue to operate. However, it is necessary to find the grounding point in time and eliminate the grounding fault as soon as possible, otherwise,...

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Problems solved by technology

[0004] However, the above-mentioned technical solutions do not involve the line selection check of the DC grounding inspection of the substation, lack of check of the insulation drop information of the multi-branches, and cannot eliminate the interference information, and may cause misselection or missed selection during the judgment

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