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Method and system for detecting DC bus branch crossing

A technology of DC bus and branch is applied in the field of detecting the mutual crossing of DC bus and branches, which can solve the problems of personal safety hazards of maintenance personnel, numerous connecting devices, mutual crossing of two-stage DC systems, etc., and achieves a simple and convenient judgment method. Detecting the effects of automation

Active Publication Date: 2016-10-05
SHENZHEN AUTO ELECTRIC POWER PLANT
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the dual power supply system, due to factors such as equipment failure and manual operation, it is easy to cause unexpected mutual channeling between the two DC systems.
The interconnection circuit of two sections of busbars is very harmful to system maintenance, equipment maintenance, and disconnection protection. Great hidden danger
At the same time, due to the complexity of the branch network and the large number of connected devices, the mutual channeling of the branches is extremely concealed, and it is quite difficult to find the branch channels.

Method used

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  • Method and system for detecting DC bus branch crossing
  • Method and system for detecting DC bus branch crossing
  • Method and system for detecting DC bus branch crossing

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Embodiment Construction

[0027] Such as figure 1 As shown, in the first embodiment of the system for detecting the mutual channeling of DC bus branches in the present invention, it includes a microcomputer insulation detector 1, a control module 2, a relay 3, a current detector 4, a first switch K1, a second switch K2, the first test bridge resistance Rp1, the second test bridge resistance Rp2, the ground wire, and the DC bus include a positive bus and a negative bus. The first test bridge resistor Rp1 and the first switch K1 are connected in series between the positive bus and the ground wire, and the second test bridge resistor Rp2 and the second switch K2 are connected in series between the positive bus and the ground wire. The system for detecting crossover of DC bus branches also includes a first balance bridge resistor Rb1 and a second balance bridge resistor Rb2. Between the busbar and the grounding line, the potential difference between the positive busbar and the negative busbar is 220V. Whe...

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Abstract

The invention relates to a method and a system for detecting DC bus branch crossing. The method comprises the following steps: detecting whether a DC bus has AC signals, and judging whether there is an insulation fault between the DC bus and a DC bus branch; if the DC bus has no AC signal and there is no insulation fault between the DC bus and the DC bus branch, switching on the test bridge of a DC bus to generate an AC signal; and inspecting another DC bus branch to judge whether the another DC bus branch has AC signals, and if the another DC bus branch has no AC signal, determining that there is crossing between the DC bus branch and the another DC bus branch. The method for detecting DC bus branch crossing is simple and easy, there is no need for operator intervention, and automatic detection is realized.

Description

technical field [0001] The invention relates to the detection field of electric power systems, and more specifically, relates to a method and system for detecting mutual channeling of DC bus branches. Background technique [0002] At present, the high-voltage DC power supply of power plants, substations and communications is used as the security power supply and control signal power supply of major electrical equipment. The DC system is an important part of power plants and substations. The safety and reliability of the DC system affects the safe operation of power plants and substations, and is related to the safe production of the entire power grid. With the application of DC current in electric power, communication, etc. and the reliability of the system is required, two independent DC current systems are required to coexist. For equipment with particularly high power supply requirements, dual power supply is used. [0003] Under the dual power supply system, due to fact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40
Inventor 王春华李志刚万新航许昭德
Owner SHENZHEN AUTO ELECTRIC POWER PLANT
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