KR200247523Y1 - Prevention Eguipment From Electrical Switching Contact Arc With Detection Break Down In Single Phase A.C - Google Patents

Abstract

The present invention relates to a technology for preventing or minimizing the arc phenomenon or the spark phenomenon when opening and closing the load (circuit) of the single-phase exchange. When the circuit is closed (ON), the arc occurs when the symmetrical voltage between phases collides at the switch contact point. In the case of heat (OFF), the arc current is also discharged at the switch contact at which the current is interrupted. In inductive loads, high voltage is generated between the contacts during heat (OFF), causing arc discharge or spark discharge. As the number of opening and closing increases, the contact function becomes poor due to the transfer or wear of the contact metal, and thus the opening and closing is impossible and the electric fire due to the arc may occur. (Provided by reference picture of attached document)

The present invention is a method for solving the above problems, as shown in the embodiment of Figs. 2 and 3, the contacts 3 and 4 of the electromagnetic switch operated by the same relay coil R are connected in series at both ends of the load. Reactors 5 and 6 are also coupled to the power supply terminals of the contacts 3 and 4, respectively. In the case of FIG. 3, the secondary coils of the reactors 5 and 6 By operating the relay (R1) at the voltage, the alarm is generated when the load 2 is disconnected or the circuit is disconnected.

The effect of the present invention is to delay the switching of each reactor at the inlet side of the load later than the closing of both switching contacts when switching on and to disconnect both lines at the same time when shutting off. At the same time, the switch contacts on both sides of the load are separated from the circuit (from the voltages L1 and L2) from the moment they are turned off, so the two contacts operated by one relay coil coupled to both sides of the load prevent or minimize arc damage. In the high voltage cable, as the semiconductor coating is placed between them in order to prevent damage caused by direct collision between the high voltage core wire and the insulating material coating (non-conductor), the present invention makes the load side between the symmetrical anode voltages unpolarized so that It is to minimize the arc damage of the contact by acting as a buffer when the electrical switch between.

Description

Arc prevention and disconnection detection device of switch contact of AC single phase load (circuit) {Prevention Eguipment From Electrical Switching Contact Arc With Detection Break Down In Single Phase A.C}

The present invention relates to a technology for preventing or minimizing arc discharge or spark discharge when switching electricity to a load (circuit) of a single-phase exchange. Conventionally, a resistor (r) and a condenser (c) are discharged to ground in series. Or by connecting a resistor and a consensus in series at both ends of the arc generating part to absorb some of the frontal collisions of the voltages between phases (A) and (B) as this circuit, aiming at the discharge effect through the side passage, and instead One or one diode or one condenser is used. The disconnection detection device of the AC stage is a current detection method using a current transformer (C.T .: CURRENT TRANSFORMER). Although these conventional arc prevention methods have some effects, they do not pass all to the side, so there is no great effect. In addition, in the conventional method of the induction current detection method by the current transformer, it is impossible to detect disconnection of a load that actually flows hundreds of amperes or less. Since thermal overcurrent relays and electronic overcurrent relays are all detected by current transformers, they lack operational accuracy at 500 milliamps and only function at least 1 amp.

It is to detect the disconnection of a small power load operating by several tens of amps, and to minimize the effects of the arc discharge method using the conventional BY PASS method.

1 is a conventional heater circuit diagram (for reference)

2 is an arc preventing device of the present invention

3 is an arc preventing device and a load break detection device of the present invention.

<Code Description of Main Parts of Drawing>

1. Switch open / close 2. Load

3,4. Contact point of electronic switch R Electronic switch

5,6. REACTOR R1 RELAY

7. Relay coil of electronic switchgear 8. Input side transformer

9. Relay relay coil 10,11. Indicator lamp

12. Contact point of electromagnetic switch R 13. Contact point of relay R1

SS. Selector switch AU. Automatic

MA. Manual A, B. Contact of power switch

CD. Contact of load-side electronic switch LC Contact of other load operating sequence

BZ buzzer P.B pushbutton switch

Contact of RC electronic switch R1C Contact of relay

r resistance c condensate

E1 Voltage applied at both ends of Reacter 5 E2 Voltage applied at both ends of Load 2

Applicable voltage S switch at both ends of E3 reactor (including the one with sequencer function)

EO input voltage F. Fuse

NFB no fuse breaker A.C exchange

L1, L2. Anode of Single Phase A and B of AC

The present invention is a method for solving the above problems, one side of the load (C) and (D), as shown in Figure 2, one side connected to the reactor (5) and the electromagnetic switch contacts (3) in series and the other A switch for opening and closing the electronic switch by configuring the circuit by connecting the actuator 6 and the electronic switch contact point 4 in series and separately configuring the operation circuit of the electronic switch allows the relay coil of the electronic switch to operate only as shown in (1).

As shown in FIG. 3, the relay 9 is connected to the secondary coil of the reactor 5. The dotted line display in Figs. 2 and 3 indicates whether or not it is possible.

When described in detail with reference to the present invention as follows. In terms of the principle of the design, the inside of a high-voltage cable is a semiconductor between an electric wire and an insulator (also known as an insulator coating) that surrounds it. In other words, if a thin film is wrapped with a semiconductor coating on a high voltage wire and wrapped with a non-conductive insulating material on it, and then wrapped with a ground coaxial sheath, the grounding is applied directly to the high voltage wire with a non-conductive insulation coating. This burns out and the cable burns out gradually. There is a semiconductor material in the middle to buffer (absorb shock). In the same sense, the presence of neutral troops on the borderline of a hostile country means that the positive voltages of (L1) and (L2), as shown in Figs. As shown in Fig. 1, when the load circuit is closed (ON), the switch (S) collides, and when the heat (OFF), both ends of the switch (S) are at the same voltage (L1), and when both ends of the switch fall, the (L1) terminal Is the voltage connected to the load side, and the terminal connected to the load side becomes the voltage of (L2), the current flows from the instantaneous positive voltage between (L1) and (L2) to the negative voltage, and the contacts are separated from each other. Causes Since the positive voltage and the negative voltage change at a cycle of 50 or 60 health for 1 second, the arcing occurs only on one side when the switch contact is disconnected within 1 / 50th or 60th of a second, but opens and closes like a poor thermal temperature switch. If the operation is not fast, the slow operation of the switch contact, which is not blocked within 50 to 60 / second, will cause the arc to become more severe due to the change of the current direction due to the change of the positive and negative electrodes, and the contact will quickly melt, transition, and drain. will be. Rather than explaining the basic theory of electricity, the opening and closing action of the voltage between (L1) and (L2) colliding and falling across the switch contact is a frontal collision like high-voltage cladding and borderline confrontation between hostile countries. When the electronic switch contacts (3) and (4) which open and close simultaneously with the same relay coil between L1) and (L2) anodes are connected to the (L1) and (L2) sides and the load is connected between them, ) And (L2) meet with the load (2) in neutral, when the (L1) side and (L2) side of the load (2) at the same time the switch contacts (3), (4) is blocked, the load (2) When falling, separate them from (L1) or (L2) to prevent the arc damage of the contacts of (3) and (4). When closing the circuit, the voltages of (L1) and (L2) entering the load (2) gradually reach later than the closing of the electromagnetic switch contacts (3) and (4) between (3) and (L1) the power supply side. The reactor (5) is connected in series, and the reactor (6) is connected in series between the contact point (4) and the power supply side (L2). It is similar to the principle that blue flame does not appear at the switch contact when electricity is applied after the switch contact is closed.

Reacta is to suppress the entry of AC. If the load is a small power of 500 milliamperes or less, there may be a need for a device that notifies the breaker alarm when it is disconnected. If the load is a heater, it can detect the disconnection by the temperature sequence, and the driving load such as a small motor can detect the failure of the motor by various orders. However, the disconnection detection device of the present invention operates more accurately than these methods, and the installation cost is low.

When the load 2 of FIG. 3 is disconnected or one of the electromagnetic switch contacts 3 and 4 becomes defective and the current is not energized, the relay R1 remains in operation and the rich BZ rings while the operation stops. .

In Figures 2 and 3 the supply voltage EO = E1 + E2 + E3.

Before implementation of the present invention, when the electricity was switched on and off, the sparkling sparkling and splashing was visible to the naked eye.

The discovery of this remarkable difference comes from the above-described theoretical description. The implementation of the device can minimize the occurrence of arcs in switching contacts for switching of single-phase alternating loads, thereby increasing the life of the contacts, preventing electrical safety incidents, and It is characteristic that it can be effective in preventing.

Claims (1)

As shown in Figs. 2 and 3, the reactor 5 and the contact point 3 of the electromagnetic switch R are connected in series at the front end of the load 2, and the reactor 6 and the electron are connected at the front end of the load 2. It is characterized in that the contact point (4) of the switch (R) is connected in series. In FIG. 3, the relay (R1) is connected to both ends of the secondary coil of the reactor (5) and the alarm display lamp (11) and the alarm rich circuit are connected. A "ark" prevention and disconnection detection device for a switch contact of an AC single-phase load (circuit), characterized in that the contact (13) of the relay (R1) and the contact (12) of the electromagnetic switch (R) are connected in series.