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RC circuit for eliminating contactor coil surge in switch cabinet

A technology for contactors and switchgears, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve damage to electronic components, interference signal interference, and electronic control error signals and other issues, to increase safety and eliminate overvoltage effects

Inactive Publication Date: 2015-08-05
SOLVE AIR HEFEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Great contact corrosion, and cause premature damage to the contactor of the coil action;
[0005] 2. May interfere with signal interference, which in some cases may cause wrong signals of electronic control and damage electronic components

Method used

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  • RC circuit for eliminating contactor coil surge in switch cabinet
  • RC circuit for eliminating contactor coil surge in switch cabinet
  • RC circuit for eliminating contactor coil surge in switch cabinet

Examples

Experimental program
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Embodiment Construction

[0013] refer to figure 1 , which includes a resistor 1, an electrolytic capacitor 2, and a power frequency AC contactor 3, the resistor 1 and the electrolytic capacitor 2 are connected in series, and the series circuit formed by the resistor 1 and the electrolytic capacitor 2 is connected in parallel with the power frequency AC contactor 3.

[0014] refer to figure 2 , this figure is a switch overvoltage condition of a contactor coil without any optimized circuit connected, it shows that the "instantaneous discharge" damped vibration caused by the energy down cycle of the contactor control magnetic coil will appear at the peak value of 3.5kv, and the instantaneous discharge will In addition, due to the steep voltage waveform of the capacitor path, it will cause signal interference to adjacent electrical and electronic equipment, capacitive coupling, and other electrical malfunctions.

[0015] refer to image 3 , this picture is to optimize and increase the protection circui...

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PUM

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Abstract

An RC circuit for eliminating contactor coil surge in a switch cabinet relates to the technical field of a switch cabinet control circuit. The RC circuit is characterized in that the RC circuit comprises a resistor, an electrolytic capacitor and a power frequency AC contactor, wherein the resistor is connected in series with the electrolytic capacitor, and a series circuit formed by the resistor and the electrolytic capacitor is connected in parallel with the power frequency AC contactor. The RC circuit is simple in structure and can effectively eliminate overvoltage generated by a contactor coil in the switching on and off process, and thus circuit safety, stability and continuity are enhanced.

Description

technical field [0001] The invention relates to the technical field of switch cabinet control circuits, in particular to an RC circuit for eliminating contactor coil surges in a switch cabinet. Background technique [0002] When the switchgear control circuit contactor is disconnected, there will be an overvoltage due to the inductance of the coil trying to maintain the current passing through it during the disconnection process. However, the circuit will be closed by the capacitance of the magnetic coil itself; if the circuit has enough power, the current And the voltage will flow through the coil in the way of damping vibration. Due to the dynamic impedance when the coil is turned off, the voltage amplitude will be in the range of several thousand volts and rise at a speed of about 1kv / us, so it is necessary to eliminate the contactor coil in the switch Overvoltage generated during the process, increase the protection circuit. [0003] In the process of using contactors t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 不公告发明人
Owner SOLVE AIR HEFEI
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