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An on-line monitoring device for substation DC power supply system

A technology of DC power supply system and monitoring device, which is applied in the direction of power supply test, measuring device, measuring electricity, etc. It 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 the search speed and fault tolerance level, and take into account the effect of fault tolerance

Active Publication Date: 2017-11-24
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • An on-line monitoring device for substation DC power supply system
  • An on-line monitoring device for substation DC power supply system
  • An on-line monitoring device for 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 on-line monitoring device of the present invention is used for inspection of the ground insulation state of the DC power supply system of the substation, such as Figure 4 As shown, the voltage detection input terminal of the online monitoring device is used to connect the positive bus +KM and the negative bus -KM of the DC power supply system of the substation, and the branch leakage current detection input terminal of the online monitoring device is used to connect For each DC branch circuit, the leakage current of each DC branch circuit is sampled, and the DC branch circuit is used for connecting conventional loads, relay protection and automatic devices, telecontrol communication devices and emergency lighting devices.

[0046] The structure of the online monitoring dev...

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Abstract

The invention relates to an on-line monitoring device for DC power supply system of a substation, relates to a relay protection and automatic device of a substation, a DC power supply system powered by a telecontrol communication device and its protection, specifically a device with the function of automatic inspection of grounding faults The online monitoring device includes 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; Calculate the amount of resistance, and the electrical connection of the three, carry out fault feature identification, adopt the automatic inspection mode driven by logic events, and integrate the line selection and verification function into the substation DC power supply system with the grounding inspection line selection and verification mechanism In the process, the unbalanced bridge mode is called through logical judgment 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 remote communication devices of substations, in particular to an on-line monitoring device for a DC power supply system of a substation, in particular to an automatic monitoring device for ground faults. On-line monitoring device with detection function. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/40G01R31/02
Inventor 雷兴徐楠戴春怡许昭德黄震宇董志赟陈中阳丁洪玲成浩季子孟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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