DC bus multi-segment parallel operation switching method and system

Abstract

The invention discloses a DC bus multi-segment parallel operation switching method and system. The method comprises the steps that: two or more segments of DC buses run in parallel, when a DC power supply in a segment of DC bus is subjected to storage battery check discharge or equipment maintenance, and a DC insulation monitoring host in the segment of DC bus automatically exits an operation andautomatically cuts off balance bridge resistance; at the same time, a grounding line selection device of all feeders in the segment of DC bus is automatically switched to a normal DC bus such that thegrounding line selection function of the segment of the DC bus is automatically switched to DC insulation monitoring host of the normal DC bus to be achieved. The method and the system have the advantages that a DC insulation monitoring extension can automatically adapt to various different distribution screen configuration modes, the DC insulation monitoring extension can automatically change anoperation mode when a distribution screen changes an operation mode, and manual intervention is not needed.

Description

technical field [0001] The invention relates to the field of DC system bus grounding monitoring technology, in particular to a switching method and system for multi-segment parallel operation of a DC bus. Background technique [0002] Existing solutions (products) monitor the operation of a section of the busbar through a balanced bridge or an unbalanced bridge with a DC leakage current sensor; at present, the following two problems exist in the monitoring of the busbar grounding of the DC system: [0003] 1. In the substation DC power system with single-bus section configuration, when a section of DC power supply is performing battery checking discharge or equipment maintenance, the contact switch is closed, and the two sections of DC power supply run in parallel, and all DC loads of the whole station are provided by the other section of DC power supply . Since the DC insulation monitoring devices of the two-stage DC power supply systems cannot be put into operation at the...

AI Technical Summary

Problems solved by technology

Since the DC insulation monitoring devices of the two DC power supply systems cannot be put into operation at the same time, all or part of the grounding line selection function of the DC power supply system is missing

[0004] 2. Among the existing products, when a certain section of DC power supply equipment is overhauled and two sections of DC power supply are operated in parallel, for some products, the DC insulation monitoring device of the inspection section can automatically exit the operation, but it cannot automatically switch off the DC insulation monitoring device of the inspection section. Cut off the balance bridge circuit; although some products can automatically cut off the balance bridge circuit of the DC insulation monitoring device in the maintenance section, they cannot realize the grounding line selection function of the DC power feeder circuit in the maintenance section

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