Secondary equipment test power supply safety starting protection device and application
A technology for testing power supplies and protection devices, applied in emergency protection circuit devices, electrical components, etc., to reduce the occurrence of power production accidents and ensure safe power production.
Active Publication Date: 2020-08-25
广东电网有限责任公司惠州供电局 +1
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Problems solved by technology
[0004] The invention proposes a secondary equipment test power supply safety start protection device and its application, aiming to solve various existing defects
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Embodiment Construction
[0019] A secondary device test power supply safety start-up protection device and its application of the present invention will be further described in detail in conjunction with specific embodiments and accompanying drawings.
[0020] Such as figure 1 , which is a schematic diagram of the connection between the secondary equipment and the DC system during the traditional secondary equipment debugging. Specifically, when the traditional secondary equipment is debugged, the power supply is usually taken from the test power panel in the station; the power supply of the test power supply panel in the station comes from the running DC system , that is, the power supply used for secondary equipment debugging is the DC system for power supply at the station. The traditional secondary equipment debugging power supply wiring is connected to the operating system. The debugging equipment is not a normal operating equipment, and the correct wiring of the equipment has not been confirmed. ...
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The invention aims to provide a secondary equipment test power supply safety starting protection device and application. The device comprises an output terminal which is used for being connected withdebugged equipment and an input terminal used for being connected with a direct current system end; a direct current contactor KM is arranged between the output terminal and the input terminal and isused for connecting the debugged equipment with the direct current system end according to an instruction sent by a control circuit; the control circuit comprises a signal measurement circuit, a maincontrol unit and a measurement and control circuit; the protection device is applied to secondary equipment test power supply safe starting, it is ensured that debugged equipment can be connected intoa direct-current power supply system only when no fault exists in the debugged equipment, alternating-current grounding faults and resistance grounding faults on the load side are prevented from being brought into the direct-current system, the electric power safe production can be guaranteed, and electric power production accidents are reduced.
Description
technical field [0001] The invention relates to the technical field of secondary power supplies, in particular to a secondary equipment test power supply safety start protection device and its application. Background technique [0002] The DC system is the power supply system for the secondary equipment of the substation. The network of the DC system of the substation is huge. The DC system is designed as an ungrounded system to prevent the ground fault from forming a wrong circuit and causing protection misoperation or refusal to operate. In order to detect the grounding fault of the DC system, a little artificial grounding point is designed for the DC system, which is the balance bridge of the insulation monitoring device. In the analysis and research of power accidents in recent years, it has been found that the resistance grounding of the DC system may cause protection malfunctions, and the voltage fluctuation of the DC system to ground may also cause protection malfunct...
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Login to View More IPC IPC(8): H02H11/00
CPCH02H11/006
Inventor 孙迪飞王英民罗振华王浩岩罗韩华郭琳李伟强罗布升梁景棠
Owner 广东电网有限责任公司惠州供电局