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A substation DC power supply system

A technology for DC power supply systems and substations, 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 involved in 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: 2017-11-24
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Description
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AI Technical Summary

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

Method used

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  • A substation DC power supply system
  • A substation DC power supply system
  • A substation DC power supply 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 substation DC power supply system, relates to a substation relay protection and automatic device, a DC power supply system powered by a telecontrol communication device and its protection, specifically a substation DC power supply system with the function of automatic ground fault inspection, Including a patrol control module, a DC bus detection module connected to the output end of the patrol control module, a DC branch detection module and a line selection check module; according to the state quantity of the current and voltage before and after the fault and the calculation quantity of the grounding resistance , and the electrical connection of the three, to identify fault characteristics, adopt the automatic inspection mode driven by logic events, integrate the line selection and verification function into the DC power supply system of the substation with the grounding inspection, line selection and verification mechanism, and pass the logic Judging and calling the unbalanced bridge mode to identify zero drift and faulty branches, and quickly identify the misselection or omission of the DC grounding inspection device.

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 Patents(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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