Digital arc extinction cabinet
A kind of arc suppression cabinet and digital technology, applied in the field of digital arc suppression cabinet, can solve the problems of power system reliability impact, arc difficult to extinguish, hazards, etc., and achieve the effect of shortening the duration and fast action speed
Inactive Publication Date: 2017-05-31
HEFEI YAFEI ELECTRICAL EQUIP
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Problems solved by technology
However, if the single-phase grounding fault is arc grounding, the grounding current of the 3-10KV power grid generally exceeds 30A, and the grounding current of the 35KV power grid exceeds 10A. Magnetic resonance, and cause healthy phase voltage to rise, the overvoltage is generally 3.15 to 3.5 times the phase voltage, which is the arc overvoltage and ferromagnetic resonance overvoltage, which has a great impact on the safe operation of the power system and the reliability of power supply big impact, great harm
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[0012] The present invention will be further described below in conjunction with the accompanying drawings.
[0013] see figure 1 with figure 2 ,in figure 1 It is a block diagram of the overall structure of a digital arc suppression cabinet proposed by the present invention; figure 2 It is a diagram of the internal structure of a digital arc suppression cabinet proposed by the present invention.
[0014] like figure 1 with figure 2 As shown, a digital arc suppression cabinet includes: a housing 1, an arc suppression controller 2 arranged inside the housing, a detection device 3 and a control and protection device 4, and the detection device 3 includes a voltage transformer 31 and a The current transformer 32, the control protection device 4 includes a door electromagnetic lock 41, a knife switch electromagnetic lock 42, an isolation knife switch 43, a high breaking high voltage fuse 44, an overvoltage protector 45, a high voltage current limiting fuse 46 and a vacuum c...
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The invention provides a digital arc extinction cabinet. The digital arc extinction cabinet comprises a shell, an arc extinction controller, a detection device and a control protection device; the arc extinction controller, the detection device and the control protection device are arranged in the shell; the detection device comprises a voltage transformer and a current transformer; the control protection device comprises an electromagnetic lock of a door, an electromagnetic lock of a knife switch, an insulation knife switch, a high-breaking high-voltage fuse, an overvoltage protector, a high-voltage current-limiting fuse and a vacuum contactor; the output ends of the voltage transformer and the current transformer are connected to the arc extinction controller; the output end of the arc extinction controller is connected to the control protection device; an RS495 interface is arranged on the arc extinction controller; and the arc extinction controller is provided with a primary microcomputer resonance-suppression device and a secondary microcomputer resonance-suppression device. The digital arc extinction cabinet provided by the invention is rapid in action speed; electric arc can be extinguished instantly; and furthermore, arc grounding overvoltage can be effectively limited.
Description
technical field [0001] The invention relates to the field of overvoltage arc suppression protection, in particular to a digital arc suppression cabinet. Background technique [0002] Most of the 3-35kV power distribution system adopts the operation mode of ungrounded neutral point. When a ground fault occurs, it is allowed to continue to run for two hours, and it can be extended if approved by the relevant superior department. However, the regulations do not clearly define the concept of "single-phase ground fault". If a single-phase ground fault is a metallic ground, the voltage of the fault phase will drop to zero, and the voltage of the other two phases to ground will rise to the line voltage UL, so this The ground-to-ground insulation level of electrical equipment such as transformers, voltage / current transformers, circuit breakers and cables in similar power grids can meet the requirements of long-term withstand line voltage without damage. However, if the single-phase...
Claims
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Inventor 李胜
Owner HEFEI YAFEI ELECTRICAL EQUIP