Novel bus earthing knife-switch control method and system
A busbar grounding and control method technology, applied in the direction of electrical components, electrical switches, circuits, etc., can solve the problems that the auxiliary switch contacts cannot be reused, the maintenance of the electrical operation circuit is difficult, and the locking conditions are difficult to change, so as to achieve easy maintenance and line inspection. Easy, reduced number of effects
Active Publication Date: 2013-08-21
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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Problems solved by technology
[0008] 1) The auxiliary switch contacts cannot be reused, and there are too many cables, such as image 3 As shown: Since the operating power supplies of the two busbar grounding switches A0G and B0G are independent of each other, all the line isolation switches 1G, 2G, NG on the bus 1M and the bus-tie isolation switch M1G on the side of the 1 busbar need to be equipped with at least Two sets of auxiliary switch contacts to connect to the electrical operating circuit of the corresponding busbar grounding switch, and the wiring of the electrical operating circuit of each busbar grounding switch is also independent;
[0009] 2) It is difficult to change the blocking conditions: when a newly installed line or an old line is removed, it is necessary to change the blocking condition of a certain grounding switch, the wiring of the line needs to be changed, and the cable needs to be dug out from the cable trough and reconnected to the relevant switch. Auxiliary switch contacts;
[0010] 3) Difficulty in repairing the electrical operation circuit: the electrical operation circuit of the busbar grounding knife switch is connected in series with the auxiliary switch grounding of the isolation knife switch of all lines on the busbar. As long as any auxiliary switch contact fails, the operation circuit will not be conducted. Find out the circuit diagram and test the auxiliary switch contacts one by one. For some old substations, if the drawings are lost, it will be more difficult to repair the fault
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[0035] Attached below figure 1 , 4 A new busbar grounding knife switch control system of the present invention will be further described.
[0036] According to the electrical operation regulations, before operating the bus grounding switch of bus 1M, all line-side isolation switches connected to bus 1M must be disconnected, that is, line-side isolation switches 1G, 2G...NG must also be disconnected 1 The bus coupler isolation switch M1G on the bus side to ensure that the bus 1M is not charged.
[0037] If it is for figure 1 , we can build the following new busbar grounding knife switch control system for it. The system includes bus tie isolation switch M1G connected to bus 1M, line isolation switch 1G, 2G...NG, bus grounding switch A0G, B0G, and also includes AC power supply 1 and the above-mentioned busbar grounding switch A0G, B0G's mechanism box 2 and five anti-locks 3 and PLC. Bus tie isolation switch M1G, line isolation switch 1G, 2G...NG have auxiliary switch contac...
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A novel bus earthing knife-switch control method comprises the following steps: 1) connecting a bus coupler isolation knife switch which is connected with a certain bus and an auxiliary switch contact of a line isolation knife switch into a PLC, enabling the PLC to acquire the position information switching value of the bus coupler isolation knife switch and the line isolation knife switch, 2) connecting a power line and a zero line of a power supply and a mechanism case of a bus earthing knife-switch of the bus into the PLC, 3) programming in the PLC according to the switching-on and switching-off condition of the bus earthing knife-switch of the bus, 4) switching off a corresponding output relay inside the bus earthing knife-switch when the PLC judges that the switching-on and switching-off condition of the bus earthing knife-switch of the bus is met, and connecting the power supply into the mechanism case of the bus earthing knife-switch of the bus. According to the novel bus earthing knife-switch control method, wiring of an electrical operating circuit of the bus earthing knife-switch can be effectively simplified, and follow-up overhauling and modification of the electrical operating circuit of the bus earthing knife-switch can be convenient to achieve.
Description
technical field [0001] The invention relates to the technical field of knife switch control in electric power systems, in particular to a busbar grounding knife switch control method and system using PLC to judge operating conditions. Background technique [0002] A knife switch is an isolating switch with a visible opening point. The breaker in the power system includes the isolation breaker and the grounding breaker. In the power system, the power-off equipment is separated from the live equipment by separating the isolation knife switch; and the power-off equipment is connected to the ground by closing the grounding knife switch, so that the staff can safely touch the power-off equipment. [0003] figure 1 It shows the schematic diagram of the knife gate connection of bus 1M (the case of bus 2M is not shown). Such as figure 1 As shown, the busbar 1M is connected to the busbar grounding switch at the beginning and the end, which are respectively A0G and B0G. How many c...
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Login to View More IPC IPC(8): H01H9/20H01H9/54
Inventor卢迪勇张言权陈泗贞李名科曾睿梁海华胡军刘洋
OwnerGUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU