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Substation direct-current power source system

A technology of DC power supply system and substation, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of lack of multi-branch insulation drop information check, not involving substation line selection check, unable to eliminate interference information, etc. , to achieve rapid diagnosis and troubleshooting, improve search speed and fault tolerance level, and reduce risks

Active Publication Date: 2015-12-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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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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  • Substation direct-current power source system
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  • Substation direct-current power source system

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Embodiment Construction

[0044] In order to better understand the above technical solutions of the present invention, a further detailed description will be given below in conjunction with the drawings and embodiments.

[0045] The substation DC power supply system of the present invention is used to provide uninterrupted power supply for important conventional loads, relay protection and automatic devices, and telecontrol communication devices of the substation, such as figure 1 As shown, the DC power supply system of the substation includes positive busbar +KM and negative busbar -KM, several DC branch circuits connecting conventional loads, relay protection and automatic devices, remote communication devices and emergency lighting devices, and a set of DC power A bridge element, and an on-line monitoring device 1 for inspecting the ground insulation state of a DC power supply system of a substation, that is, an inspection device.

[0046] Such as figure 1 As shown, the DC bridge components include...

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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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 徐楠雷兴黄震宇许昭德盛炜张雯刘高原石天宇江志清姜贞
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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