Transformer station DC system based on DC/DC isolation module
A technology for isolating modules and DC systems, applied in the field of DC systems in substations, can solve the problems of large influence range of one-point grounding faults, limited reliability improvement effect, and high equipment investment costs, so as to reduce the probability of two-point grounding, reduce the probability of occurrence, The effect of improving accuracy
Pending Publication Date: 2017-12-15
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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Problems solved by technology
[0005] In view of this, the present invention provides an improved substation DC system based on DC / DC isolation module, which is used to solve the problems of large influence range and difficult fault finding in the traditional substation DC system, and the existing DC / DC based DC system The substation DC system with isolated modules has limited reliability improvement effect and high equipment investment costs.
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0017] see figure 1 , a substation DC system based on DC / DC isolation modules provided by the present invention, it consists of 2 sets of charging devices, 2 sets of battery packs, 2 DC main screens, 4 DC split screens, 8 DC / DC isolation modules, 80 It is composed of 1 DC load, 92 circuit breakers and 1 bus tie switch.
[0018] In the DC system of the substation, the incoming lines of the two DC main screens are connected to a charging device and a set of battery packs through a circuit breaker to provide power for the DC main screens; the two DC main screens are connected by a bus tie switch. When the bus tie switch is disconnected during operation, when the charging device and battery pack of one side of the DC main screen need to be repaired, the DC main screen can be powered by another set of charging device and battery pack by closing the...
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The invention discloses a transformer station DC system based on a DC / DC isolation module. A conventional transformer station DC system based on the DC / DC isolation module will cause the power failure of a DC load on the same line when the DC / DC isolation module has a fault, and may cause the decrease the reliability of a DC system. The technical scheme of the invention is that incoming lines of two-side DC main screens are respectively connected with a charging device and a storage battery pack through a circuit breaker; two-side DC main screens are connected through a bus switch; each outgoing line of the two-side DC main screens is provided with an DC / DC isolation module, and is connected with the each incoming line of the two-side DC main screens through the circuit breaker; each outgoing line of the two-side DC main screens is connected with each DC load through the circuit breaker. The system enables a grounding fault influence range to be limited in a DC branch screen where the DC load is located, and can effectively improve the reliability of a DC system and the searching efficiency of a grounding fault point.
Description
technical field [0001] The invention relates to the technical field of substation direct current systems, in particular to a substation direct current system based on a DC / DC isolation module. Background technique [0002] The DC system of the substation provides working power for the relay protection device, control and operation circuit, communication system, etc. in the substation. It is the basis for the control and protection of the power system. Its reliable power supply is an important guarantee for the safe and stable operation of the substation. One-point grounding of the DC system mainly occurs in the DC bus, outdoor feeder cables, terminal boxes, etc., and is the most common type of fault in the DC system. The traditional DC system uses busbars, cables, switches, etc. to realize the connection of all DC equipment in the station, and there is no electrical isolation between them. A ground fault at any point will propagate to the busbar and other lines, causing abno...
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CPCH02J1/10
Inventor 杨涛黄晓明王鑫杰徐习东陆承宇王松吴栋萁方芳宣佳卓汪冬辉戚宣威孙志达
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY