Zero-sequence protection circuit and system applying same

A zero-sequence protection and circuit technology, applied in emergency protection circuit devices, circuit devices, AC network circuits, etc., can solve problems such as single protection function, three-phase unbalance, electrical failure, etc., to improve safety performance and improve power quality. , the effect of improving processing speed and responsiveness

Inactive Publication Date: 2016-04-27
NINGBO HI TECH ZONE DINGNUO ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual work, it brings great risks to the user unit. At the same time, because the protection function in this system is very single, due to the working

Method used

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  • Zero-sequence protection circuit and system applying same
  • Zero-sequence protection circuit and system applying same
  • Zero-sequence protection circuit and system applying same

Examples

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, a schematic diagram of a zero-sequence protection circuit, a zero-sequence protection circuit, includes a three-phase connection port 1, a circuit breaker 2 connected to the three-phase connection port 1, a thyristor 3 connected to the circuit breaker 2, and the three-phase connection A zero-sequence transformer 4 is set on the port 1, and the control terminal of the thyristor 3 is connected to an intelligent controller 7 through a normally closed electronic switch 6, and the zero-sequence transformer 4 is electrically connected to the normally closed electronic switch 6 for detecting In the case of leakage, drive the normally closed electronic switch 6 to disconnect to cut off the connection of the intelligent controller 7 .

[0039]A zero-line transformer is added to the incoming line side of the module. The output current...

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PUM

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Abstract

The invention discloses a zero-sequence protection circuit, which aims to provide electric leakage detection and switch-off protection to a three-phase circuit, and solves the problem of three-phase imbalance electric leakage phenomenon due to operating states of a capacitor in operation. The zero-sequence protection circuit is characterized by comprising a three-phase wiring port, a circuit breaker connected with the three-phase wiring port, and a thyristor connected with the circuit board, wherein the three-phase wiring port is sleeved with a zero-sequence mutual inductor, a control end of the thyristor is connected with an intelligent controller through a normally-closed electronic switch, and the zero-sequence mutual inductor is electrically connected with the normally-closed electronic switch for driving the normally-closed electronic switch to switch off when detecting electric leakage, thereby switching off connection of the intelligent controller. The zero-sequence protection circuit and a system applying the same achieve the effect of improving safety performance and power compensation.

Description

technical field [0001] The present invention relates to power distribution technology, and more specifically, it relates to a grid compensation control circuit system. Background technique [0002] In the field of power distribution technology of the power grid, an automatic input capacitor compensation device is installed on the user or near the user's transformer to balance the reactive power and limit the transmission of reactive power in the power grid, which can reduce the reactive power loss of the power grid, and at the same time The delivery volume of active power can be increased. The main function of reactive power compensation is to improve power factor to reduce equipment capacity and power loss, stabilize voltage and improve power supply quality, improve transmission stability and transmission capacity in long-distance power transmission, and balance active and reactive power of three-phase loads. Installing capacitors for reactive power compensation can limit ...

Claims

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Application Information

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IPC IPC(8): H02H3/34H02J3/18
CPCH02H3/34H02J3/1864Y02E40/30
Inventor 吴雄飞
Owner NINGBO HI TECH ZONE DINGNUO ELECTRIC
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