System and method for detecting mutual direct-current flow between different direct-current systems
A DC system and detection system technology, which is applied in the field of DC crossover detection system, can solve the problems of difficult identification of crossover, DC crossover of busbars, etc., and achieve the effects of less error prone, obvious voltage fluctuations, increased stability and safety
Inactive Publication Date: 2017-06-13
STATE GRID INTELLIGENCE TECH CO LTD +2
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Problems solved by technology
However, due to miswiring, mis-touching, device performance degradation, etc., it is easy to cause DC cross-channeling of the busbar. DC cross-channeling is a situation in which two DC systems are short-circuited to each other and affect their respective insulation detection.
Because two DC systems are involved, crossover is more difficult to identify
Method used
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[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0036] When the two DC power systems cross each other, the voltages of the two interconnected poles are close to the same. When the system on this side performs switching of the unbalanced bridge, the voltage of the system on the opposite side also changes accordingly. Based on this phenomenon, the DC crossover is judged and the crossover branch is selected.
[0037] Such as figure 1 As shown, an insulation monitoring device is arranged on the busbars of the two DC systems respectively. The two insulation monitoring devices are connected through communication lines. The communication line can be a network line, RS485 line, or RS232 line. The two DC systems are respectively arranged with balance bridges as shown in the figure.
[0038] The bridge resistance is selected according to:
[0039] 1) The resistance value of the balance bridge resistance s...
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Abstract
The invention discloses a system and method for mutual direct-current flow between different direct-current systems. The system comprises insulation monitoring devices arranged on direct-current buses of different direct-current systems, wherein the insulation monitoring devices are communicated, and a balancing bridge circuit is arranged on each direct-current bus and is provided with a selector switch, so that the balancing bridge circuit is switched between a balanced state and a non-balanced state. When mutual direct-current flow occurs between two direct-current power systems, two mutually connected poles are approximately consistent in voltage. When the local-side system performs non-balanced bridge switching, the voltage of the opposite-side system also correspondingly changes, mutual direct-current flow is judged based on the phenomenon, and branch circuits producing mutual direct-current flow are selected out.
Description
technical field [0001] The invention relates to a system and method for detecting DC crossover between different DC systems. Background technique [0002] The DC system is an important part of the substation and also a guarantee for the safety of the substation. Two sets of DC systems, that is, two busbars running in parallel, is a common mode for 220KV and above substations. However, due to miswiring, mis-touching, and device performance degradation, it is easy to cause DC cross-channeling of the busbar. DC cross-channeling is a situation in which two DC systems are short-circuited to each other and affect their respective insulation detection. Because two DC systems are involved, mutual channeling is more difficult to identify. Contents of the invention [0003] In order to solve the above problems, the present invention proposes a DC crossover detection system and method between different DC systems. The present invention is based on the fact that when two DC power sy...
Claims
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Login to View More IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 孙志周曹淑英何军田宋成磊王秉钧傅孟潮巩方波张晓花
Owner STATE GRID INTELLIGENCE TECH CO LTD