CN212209277U - Arc extinguishing device - Google Patents

Abstract

The utility model relates to an arc control device, a breakpoint and load series connection, it includes an electric capacity, electric capacity is filled with and is less than load operating voltage's voltage, electric capacity with the load is parallelly connected. The utility model has the advantages of simple circuit and low cost.

Description

Arc extinguishing device

Technical Field

The utility model relates to an arc control device especially one kind is suitable for the arc to mechanical contact such as mechanical switch, heater, wire, copper bar and other breakpoints (like switch contact breakpoint, the fusing of fuse-link, breakpoint, the wire breakpoint between plug and the socket) electric arcs, or alternately, to the arc extinguishing device of ground fault electric arc extinguishing.

Background

At present, in an electric system, a mechanical switch such as a circuit breaker, a contactor (relay), and the like, a fuse, a wire, a heating wire, and the like have a large arc (working arc or fault arc) when breaking a current (load), but generally, oscillation occurs easily in the arc breaking process (as shown in fig. 1, point a is a starting point of breaking a breakpoint), which causes problems of prolonged arcing time and easy overvoltage generation, although related problems can be improved to a certain extent in a mechanical switch parallel capacitor (the withstand voltage value of the capacitor is required to be much higher than the system voltage) or a load parallel capacitor (the capacitor is powered in advance to the rated voltage of the load or above).

In the situation of disconnecting large current, the capacitance of the capacitor is required to be extremely large so as to effectively overcome the oscillation and suppress overvoltage, the load working voltage (arc-breaking voltage) is lower than 450V, and the electrolytic capacitor has great cost advantage and volume advantage compared with a non-polar capacitor, but the electrolytic capacitor in the prior art is difficult to increase the voltage when the voltage is higher than 450V, and the capacitor is simply connected with a mechanical switch in parallel or connected with a load in parallel, so that the defect of high cost exists.

Disclosure of Invention

The invention aims to solve the problems at present and provides an arc-extinguishing device which is simple, low in cost and good in safety.

Realize the utility model discloses an aim at reaches through following technical scheme:

an arc extinguishing device, a breakpoint is connected in series with a load, and comprises a capacitor, wherein the capacitor is charged with a voltage lower than the working voltage of the load, and the capacitor is connected with the load in parallel.

The voltage value of the voltage is less than 90% of the voltage value of the working voltage.

An arc extinguishing device, the capacitor is an electrolytic capacitor.

An arc extinguishing device, the withstand voltage value of the electrolytic capacitor is less than 650V.

An arc control device, still include a resistance, a diode, a voltage regulator device, voltage regulator device with the electric capacity is parallelly connected, the resistance with the diode is parallelly connected, operating voltage passes through the resistance is to the electric capacity charges, in the arc extinguishing process, the electric capacity passes through the diode is to load discharge.

An arc extinguishing device, wherein the voltage value of the working voltage is larger than 450V.

An arc-extinguishing device, the break point is a contact of a mechanical switch.

The utility model relates to a rationally, the utility model has the advantages of the circuit is simple, with low costs, the security is good.

Drawings

Fig. 1 is a schematic diagram of a load voltage waveform according to the present invention.

Fig. 2 is a schematic diagram of an embodiment of the arc extinguishing device of the present invention.

Fig. 3 is a schematic diagram of the load voltage waveform of the arc extinguishing device adopting the utility model.

Detailed Description

The utility model discloses arc control device's embodiment one:

an arc-extinguishing device, a break point K (mechanical switch) is connected with a load M in series, and comprises a capacitor C1, a capacitor C1 is charged with voltage lower than M working voltage (the voltage value of the voltage is lower than 90% of the voltage value of the working voltage and is smaller than the peak valley of working voltage fluctuation), and a capacitor C1 is connected with the load M in parallel; the arc extinguishing device further comprises a resistor R1, a diode D1 and a voltage stabilizing device Z1, the voltage stabilizing device Z1 is connected with the capacitor C1 in parallel, the resistor R1 is connected with the diode D1 in parallel, the break point K is closed, the working voltage charges the capacitor C1 through the resistor R1, and in the arc extinguishing process, the capacitor C1 discharges to the load M through the diode D1.

The capacitor is an electrolytic capacitor, the voltage value of the working voltage is more than 450V, and the withstand voltage value of the electrolytic capacitor is less than 650V (if the withstand voltage value is too high, the cost ratio of the capacitor to the non-polar capacitor is not advantageous).

The above break points are contacts of the mechanical switch.

In this embodiment, since the voltage of the capacitor C1 is lower than the working voltage of the load M, the discharging phenomenon of the capacitor C1 does not occur when the working voltage fluctuates, the loss is small, and the electrical life of the capacitor is long.

Fig. 3 is a schematic diagram of the voltage waveform of the load after the arc extinguishing device is adopted.

In order to facilitate popularization and application, facilitate standardization and mass production and become a universal device, the above embodiment can be packaged into a device by adopting an insulating material, and a two-port mode can be adopted.

In the above embodiments, the mechanical switch is a contactor (relay), and any mechanical break point that is the target of arc extinction can also be defined as a mechanical switch, such as a fuse link, a connector, etc.

To sum up, the utility model has the advantages of it is following: simple circuit and low cost.

Claims (7)

1. An arc control device, a breakpoint and load series connection, characterized by: the load-limiting circuit comprises a capacitor, wherein the capacitor is charged with voltage lower than the working voltage of the load, and the capacitor is connected with the load in parallel.

2. The arc extinguishing device of claim 1, wherein: the voltage value of the voltage is less than 90% of the voltage value of the working voltage.

3. The arc extinguishing device of claim 1, wherein: the capacitor is an electrolytic capacitor.

4. An arc extinguishing device according to claim 3, characterized in that: the withstand voltage value of the electrolytic capacitor is less than 650V.

5. The arc extinguishing device of claim 1, wherein: the arc extinguishing device comprises a capacitor, a resistor, a diode and a voltage stabilizing device, wherein the voltage stabilizing device is connected with the capacitor in parallel, the resistor is connected with the diode in parallel, the working voltage charges the capacitor through the resistor, and the capacitor discharges to the load through the diode in the arc extinguishing process.

6. The arc extinguishing device of claim 1, wherein: the voltage value of the working voltage is larger than 450V.

7. The arc extinguishing device of claim 1, wherein: the break point is a contact of a mechanical switch.

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