Grounding protection system for high-voltage switch cabinet
A high-voltage switchgear, grounding protection technology, applied in emergency protection circuit devices, substation/switch layout details, emergency protection detection, etc. The effect of improving equipment operation rate, convenient operation and reducing the scope of failure and power outage
Inactive Publication Date: 2018-07-06
河南北瑞电子科技有限公司
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Problems solved by technology
[0002] 5 kV or 10 kV high-voltage switchgear generally adopts a neutral point ungrounded system. When a single-phase ground fault occurs in the system, the voltage of the faulty phase to the ground is zero, and the voltage of the non-faulty phase to the ground is the line voltage. When zero-sequence voltage is used for grounding protection, the system can only know that a fault has occurred, but cannot accurately determine which line is grounded, and the method of determining the fault line by sequentially closing the switch will cause the entire line to fail. Line power outage seriously affects production and residents' lives
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[0014] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0015] Such as Figure 1 to Figure 3 As shown, a high-voltage switchgear grounding protection system according to the present invention includes a detection device, a signal transmission device and a controller. The detection device is arranged in the high-voltage switchgear to detect whether overvoltage or If there is a flow fault, the detection device is connected to the controller through a signal transmission device, and the signal transmission device is used to send the detection result of the detection ...
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The invention discloses a grounding protection system for a high-voltage switch cabinet. The grounding protection system is composed of a detecting device, a signal transmission device and a controller. The detecting device arranged in a high-voltage switch cabinet is used for detecting whether an over-voltage or over-current fault occurs in the high-voltage switch cabinet and is connected with the controller by the signal transmission device. The signal transmission device is used for sending a detection result from the detecting device to the controller; and the controller processes a faultline and employs a single-chip microcomputer. According to the invention, the detecting device detects whether a fault occurs in the high-voltage switch cabinet; and when a fault occurs at the line, the door of the high-voltage switch cabinet is closed by using an electromagnetic lock to ensure safety; the signal transmission device is used for sending fault information to the controller; and thecontroller controls disconnection of the line corresponding to the fault point. Therefore, the time of searching for a fault point by the staff is reduced substantially; the fault power failure rangeis reduced; and the equipment operating rate is increased.
Description
technical field [0001] The invention relates to the field of high-voltage switch cabinets in electrical equipment, in particular to a grounding protection system for high-voltage switch cabinets. Background technique [0002] 5 kV or 10 kV high-voltage switchgear generally adopts a neutral point ungrounded system. When a single-phase ground fault occurs in the system, the voltage of the faulty phase to the ground is zero, and the voltage of the non-faulty phase to the ground is the line voltage. When zero-sequence voltage is used for grounding protection, the system can only know that a fault has occurred, but cannot accurately determine which line is grounded, and the method of determining the fault line by sequentially closing the switch will cause the entire line to fail. Line power outage seriously affected production and residents' lives. Contents of the invention [0003] The purpose of the present invention is to provide a high-voltage switchgear grounding protecti...
Claims
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IPC IPC(8): H02H7/26H02H7/22H02H1/00H02B1/32
CPCH02H7/26H02B1/32H02H1/0007H02H7/22
Inventor 常胜
Owner 河南北瑞电子科技有限公司