Capacitance compensation fling-cut switch

Abstract

The invention discloses a capacitance compensation fling-cut switch which comprises a heat radiating base, two to three silicon controlled modules and a DC power source device, wherein each silicon controlled module has the same structure and is provided with an indicator light, and whether the silicon controlled modules stay in working states can be clearly judged through the switching-on and switching-off of the indicator light. When the fling-cut switch is used, once reactive power is insufficient, a DC current from a corresponding external control device connected with the DC power source device flows into a circuit board and is then outputted to the control circuit of each corresponding silicon controlled module. Not only can the indicator light be illuminated, but also a photoelectric coupler of the control circuit stays in the working state. Two high power thyristors which are connected in parallel back to back respectively stay in a conduction state in corresponding positive and negative voltages. Because each silicon controlled module of the fling-cut switch is connected with a corresponding capacitor group, the reactive power of a power grid is compensated under the condition that the fling-cut switch is conducted.

Description

technical field [0001] The invention relates to a capacitance compensation switching switch. Background technique [0002] Capacitor compensation switch has a wide range of applications. For example, it can be used in low-voltage reactive power compensation devices to quickly switch through zero for low-voltage shunt capacitors, which can achieve the effects of no inrush current, no spark, and no noise during working conditions. [0003] Chinese patent document CN101667733A (application number 200910035447.1) discloses a "capacitance compensation switching switch". The thyristor module in the capacitance compensation switching switch uses a bidirectional thyristor. Through the connecting piece and connected in reverse parallel by the fastening screw, when in use, the output end of the peripheral control circuit is electrically connected to the PCB terminal of the circuit board, and then the capacitance compensation switching switch is electrically connected to the load. It ...

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Problems solved by technology

It can be seen from this that the structure will produce a voltage drop at the connecting piece that electrically connects the two unidirectional thyristors, and the switching response speed is slow. If the connecting piece screw is loose, it will cause high temperature when the current flows, which will seriously Burn down the entire module; secondly, if you want to know the working state of the thyristor, you must use related tools to test it, which is troublesome; finally, the capacitor compensates the control terminal of each thyristor of the switching switch and the output of the circuit board. There are 4 sets of electrical connectors at the terminal, which makes it easy to touch the secondary wire when installing the primary wire. When the primary wire is loose, the wire on the primary wire and the secondary wire are easily short-circuited, causing the module to burn out, and the installation and connection are more complicated.

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