KR200266975Y1 - A Sensor of the State of Circuit Breaker Operating Coil - Google Patents

Abstract

The present design detects the presence of disconnection of the operation coil of the breaker separating the fault part from the normal section in order to prevent the breakdown in the event of a major failure in the electrical equipment, so that the breaker operation coil can be displayed externally when the breaker operation coil is disconnected. A detection circuit for disconnection of an operation coil, the detection circuit of the present invention includes a power distribution unit 120 for distributing power supplied from the power supply unit 110 through the resistor (R5) (R6); The circuit breaker operation coil L and the resistor R1 are connected in parallel to form one bridge b1, and each of the bridges b2 is formed of resistors R2, R3, and R4 having the same impedance as the one bridge b1. (b3) and (b4) are formed and interconnected to the bridge circuit unit 130; When the operation coil L connected in parallel to one bridge b1 of the bridge circuit unit 130 is disconnected, the power distributed from the power distribution unit 120 is divided into each bridge b1 and b2 of the bridge circuit unit 130. and an operation coil disconnection display unit 140 driven by a potential difference between nodes n1 and n3 generated while passing through (b3) and (b4).

Description

Breaker operation coil disconnection detection circuit {A Sensor of the State of Circuit Breaker Operating Coil}

The present invention relates to a disconnection detection circuit of a breaker operation coil, and more particularly, to detect a breaker by detecting the operation coil disconnection of a breaker that separates a fault part from a normal section in order to prevent a breakdown when a major failure occurs in an electrical installation. The present invention relates to a circuit breaker detection circuit of a circuit breaker operation coil that can be displayed to the outside when the operation coil is disconnected.

The breaker is one of the important electrical devices that performs the connection between the generator and the electrical equipment or the electrical equipment and other electrical equipment for the stable operation of the electrical equipment. The breaker is equipped with an operating coil that separates the fault section from the normal section by the operator's operation or by a protective relay signal when a major fault occurs in the electrical installation.

1 is a circuit diagram schematically showing such a conventional general circuit breaker configuration.

As shown in FIG. 1, the breaker 10 is provided with an operation coil 12 and an operation switch 11, and the operation coil 12 is connected to the electrical installation 20 in a circuit.

The operation switch 11 is a switch for performing a normal function of the circuit breaker 10. When the operation switch 11 is turned on, a strong magnetic field is generated by the power supplied to the operation coil 12. It is supposed to work.

If the breaker 10 does not operate normally even when the operation switch 11 is turned on, after checking the disconnection of the operation coil 12 through a close inspection, the disconnected operation coil 12 is replaced as a spare part. It must be replaced.

However, since the normal operation of the breaker through the operation switch 11 can be checked only when the operation switch 11 is operated, there is a problem in confirming a breaker failure that may not occur when and how. Furthermore, considering the ripple effects of electrical accidents that may occur when the breaker does not operate normally, the reliability of the breaker must be secured, but the conventional breaker has no method of effectively confirming this.

The present invention was devised to solve the above problems, and the object of the present invention is to detect the disconnection of the breaker operation coil at all times and to detect the breaker operation coil in case the operation coil is disconnected. It is to provide a disconnection detection circuit.

Circuit breaker detection circuit of the circuit breaker operation coil of the present invention for achieving the above object comprises a power distribution unit for distributing the power supplied from the power supply through the resistor (R5) (R6); The circuit breaker driving coil L and the resistor R1 are connected in parallel to form one bridge b1, and each of the bridges b2 is formed of resistors R2, R3, and R4 having the same impedance as the one bridge b1. (b3) and (b4) are formed and interconnected to each other; When the drive coil L connected in parallel to one bridge b1 of the bridge circuit part is disconnected, the power distributed from the power distribution part passes through each of the bridges b1, b2, b3, and b4 of the bridge circuit part. And a drive coil disconnection display unit driven by a potential difference between the generated nodes n1 and n3.

In addition, the sensing circuit of the present invention has a relay contact (Rs2) that is opened and closed to supply the power distributed by the power distribution unit to the bridge circuit portion, and is opened and closed to directly supply the power supplied from the power supply to the bridge circuit portion. Relay contact (Rs1), the relay contact (Rs3) (Rs4) for opening and closing the connection of one bridge (b1) and the other bridge (b2) (b4) connected in parallel with the operation coil (L) and the resistor (R1) in the bridge circuit portion A relay Ry for controlling a); The relay unit may further include an operation switch S1 which is switched to supply power to the relay Ry.

In one bridge b1 in which the operation coil L and the resistor R1 of the bridge circuit unit are connected in parallel, the impedance of the resistor R1 has a larger value than the impedance of the operation coil L. It is preferable that the display portion is made of any one of a light emitting diode or a buzzer which can be driven by the potential difference between the nodes n1 (n3) of the bridge circuit portion.

1 is a circuit diagram showing a schematic configuration of a conventional circuit breaker;

2 is a block diagram of a circuit breaker detecting circuit of the circuit breaker operation coil according to the present invention;

3 is a detailed circuit diagram of a disconnection detection circuit of an operation coil according to an embodiment of the present invention;

4 is a sensing circuit diagram in which the operation switch is turned off according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating a process in which the sensing circuit is operated as the operation switch is turned off.

6 is a sensing circuit diagram in which the operation switch is turned on according to an embodiment of the present invention, and FIG. 7 is a flowchart illustrating a process of operating the sensing circuit as the operation switch is turned on.

※ Explanation of codes for main parts of drawing

110: power supply unit 120: power distribution unit

130: bridge circuit unit 140: operation coil disconnection display unit

150: relay unit S1: operation switch

Ry: Relay Rs1, Rs2, Rs3, Rs4: Relay contact

R1, R2, R3, R4: Bridge Resistor R5, R6: Power Distribution Resistor

L: Operation coil n1, n2, n3, n4: Node

b1, b2, b3, b4: Bridge LED: Light emitting diode

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a circuit for detecting disconnection of a circuit breaker operation coil according to an embodiment of the present invention, and FIG. 3 is a detailed circuit diagram of the sensing circuit.

2 and 3, the sensing circuit according to the present invention is a power supply unit 110 for power supply, a power distribution unit 120 for distributing the power supplied from the power supply unit 110, The bridge circuit unit 130 for detecting the disconnection of the breaker operation coil, the operation coil disconnection display unit 140 for displaying the breaker operation coil to the outside when the breaker operation coil is disconnected through the bridge circuit unit 130, and the respective units. It comprises a relay unit 150 for controlling the relay contact connected to set the power supply line.

The power supply unit 110 serves to supply power supplied from an external power supply device to each part of the sensing circuit. In an embodiment of the present invention, the power supply unit 110 generally supplies power of DC 110V. Supply to the sensing circuit.

The power distribution unit 120 includes a plurality of resistors R5 and R6 for distributing power, and a node between the resistors R5 and R6 is connected to a bridge circuit unit 130. Therefore, the power distribution unit 120 distributes the power supplied from the power supply unit 110 and supplies the distributed power to the bridge circuit unit 150. The relay contact Rs2 is opened and closed by the control of the relay unit 150 between the resistor R5 of the power distribution unit 120 and the node connected to the bridge circuit unit 130.

The bridge circuit unit 130 is a bridge (b1) (b2) (b3) (b4) is interconnected through a plurality of nodes (n1) (n2) (n3) (n4) to form a closed circuit, this bridge circuit unit ( The bridge b2 between the nodes n1 and n2 of 130 is provided with a relay contact Rs3 and a resistor R2 connected in series, and the bridge b3 between the nodes n2 and n3 is provided with a resistor R3. The bridge b4 between n3 and n4 is provided with a resistor R4 and a relay contact Rs4 connected in series, and the operation coil L and the resistor R1 are connected in parallel with the bridge b1 between the nodes n4 and n1. It is. The relay contacts Rs3 and Rs4 are opened and closed by the control of the relay unit 150, and the power distributed through the power distribution unit 120 is supplied to the nodes n2 and n4.

In the embodiment of the present invention, each of the resistors R2, R3, and R4 provided in each of the bridges b2, b3, and b4, and the operating coil L and the resistors provided in the bridge b1 Impedance by the parallel connection of R1) is configured to be the same or similar to each other. In addition, the impedance of the resistor R1 has a sufficiently large value compared to the impedance of the operating coil L.

In other words, ego, to be.

The operation coil disconnection display unit 140 is configured between the nodes n1 and n3 of the bridge circuit unit 130, and the display device is driven by the potential difference when a potential difference is formed between the two nodes n1 (n3). In the embodiment of the present invention, the operation coil disconnection display unit 140 is configured as a light emitting diode (LED), and when a potential difference is generated between two nodes n1 and n3 of the bridge circuit unit 130, current is turned on and turned on. When the potential difference is not formed or the potential difference is weak, the light emitting diode LED is not turned on.

Since the same or similar impedance is formed in the bridges b1, b2, b3, and b4 connected between the nodes in the bridge circuit unit 130, if the bridge circuit unit 130 has no abnormality, the two nodes n1 ( The potential difference between n3) is not generated or is weak even if it is generated so that the light emitting diode (LED) should not be turned on. Therefore, when the light emitting diode LED is turned on, the impedance formed in each of the bridges b1, b2, b3, and b4 of the bridge circuit unit 130 is different, which means that the operation coil L of the bridge b1 is changed. It means disconnected.

In the exemplary embodiment of the present invention, the operation coil disconnection display unit 140 is configured to visually warn that the operation coil L is disconnected by using the light emitting diodes (LEDs). It can be modified. For example, a buzzer or the like may be used instead of a light emitting diode (LED) to indicate that the operation coil is disconnected by sound.

The relay unit 150 has a relay contact (Rs2) to be opened and closed to supply the power distributed by the power distribution unit 120 to the bridge circuit unit 130, and the power supplied from the power supply unit 110 to the bridge circuit unit A relay Ry controlling the relay contacts Rs1 that are opened and closed so as to be directly supplied to the 130, and the relay contacts Rs3 and Rs4 that are provided and opened at the bridges b2 and b4 of the bridge circuit unit 130. )Wow; The relay Ry is provided with an operation switch S1 that is switched so that power can be supplied from the power supply unit 110.

When the relay Ry of the relay unit 150 is not driven, the relay contact Rs1 is opened, and Rs2, Rs3, and Rs4 are set to remain closed. When the relay Ry is driven, the relay contacts Rs1 are opened. Relay contacts are reversed in their state.

Hereinafter, the operation of detecting the disconnection of the circuit breaker operation coil having the above configuration will be described in detail. In describing the operation of the sensing circuit, the operation switch S1 will be described separately according to the on / off state.

<When operation switch S1 is turned off>

4 illustrates a sensing circuit diagram in which power is supplied when the operation switch S1 is turned off according to the present invention, and FIG. 5 illustrates a process in which the sensing circuit is operated as the operation switch S1 is turned off. One flow chart.

If the operation switch S1 is turned off (step S100), no power is supplied to the relay Ry, and thus the relay contact Rs1 is opened and the relay contacts Rs2, Rs3, and Rs4 are closed. (Step S110).

In step S110, the relay contact Rs1 is opened and the relay contact Rs2 is closed, so that the power of the power supply unit 110 is supplied to the power distribution unit 120, and the power distribution unit 120 supplies the resistance (R5). Is distributed through R6 (step S120). Therefore, the sensing circuit is supplied with power as shown in FIG. 4.

The power distributed by the power distribution unit 120 is supplied to the nodes n2 and n4 of the bridge circuit unit 130. The ground voltage is supplied to the node n4, and the node n2 is supplied to the node n2. Is supplied (step S130).

The power supplied to the nodes n2 and n4 of the bridge circuit unit 130 is an impedance of the bridges b2, b3, b4 and b1 connecting the nodes n1, n2, n3 and n4. Are respectively distributed to the light emitting diodes (LEDs) of the operation coil disconnection display unit 140 (step S140).

At this time, when the potential difference between the nodes n1 and n3 of the bridge circuit unit 130 exceeds the reference value, the light emitting diode LED is turned on (steps S150 and S160). The potential difference reference value between the nodes n1 and n3 of the bridge circuit unit 130 means a potential difference for turning on the light emitting diode LED, which may vary according to the type of the light emitting diode LED.

That the light emitting diode LED is turned on, that is, the potential at the node n1 is greater than the potential at the node n3 means that the operation coil L located at the bridge b1 is disconnected (step S170). This means that although the potential of each of the bridges b1, b2, b3, and b4 is equally configured so that no potential difference occurs between the nodes n1 and n3, the potential of the node n1 is greater than that of the node n3. This implies that the impedance of (b1) is larger than the impedances of the other bridges (b2), (b3) and (b4), because the impedance is formed only by the resistor R1 when the operating coil L is disconnected. Therefore, when the operation coil L is disconnected, the light emitting diode LED is turned on so that the user can easily check it, and the malfunction of the circuit breaker can be prevented by replacing the disconnected operation coil LED.

If the potential difference between the nodes n1 and n3 of the bridge circuit unit 130 in the step (S150) is less than the reference value, the light emitting diode (LED) is not turned on (step S180), which means that the operation coil L is not disconnected and normally It is meant to be operated (step S190).

<When operation switch S1 is turned off>

6 is a diagram illustrating a sensing circuit in which power is supplied when the operation switch S1 is turned on according to the present invention, and FIG. 7 is a flowchart illustrating a process in which the sensing circuit is operated when the operation switch S1 is turned on. to be. The turn-on of the operation switch S1 is for manually inspecting the operation of the breaker as in the case of the conventional breaker inspection.

When the operation switch S1 is turned on (step S200), power is supplied to and driven by the relay Ry through the operation switch S1 (step S210), whereby the relay contact Rs1 is closed and the relay contact Rs2 And Rs3 and Rs4 are in an open state (step S220). Therefore, the sensing circuit is connected as shown in FIG. 6 to receive power from the power supply unit 110.

The supply power of the power supply unit 110 is applied to the nodes n1 and n4 of the bridge circuit unit 130 through the relay contact Rs1 (step S230).

If power is applied to the bridge circuit unit 130 and the breaker operates normally, this means that the operation coil L of the breaker is in a normal state rather than a disconnected state (steps S240 and S250). This is configured such that in the operating coil L and the resistor R1 connected in parallel to the bridge b1 of the bridge circuit unit 130, the impedance of the resistor R1 is sufficiently larger than the impedance of the operating coil L. Therefore, most of the current flows to the operating coil L having a small impedance, and thus the circuit breaker operates normally by the magnetic field generated by the operating coil L.

If the circuit breaker does not operate in step S240, this means that the operation coil L of the circuit breaker is disconnected and the disconnected operation coil L should be replaced (step S260).

As described above, the disconnection detection circuit of the breaker operation coil according to the present invention can easily check the disconnection of the operation coil through the operation coil disconnection display unit without operating the operation switch of the circuit breaker, and also the conventional method of the circuit breaker. Likewise, the breaker operation coil can be checked through the operation switch.

Claims (4)

A power distribution unit 120 for distributing power supplied from the power supply unit 110 through the resistors R5 and R6; The circuit breaker operation coil L and the resistor R1 are connected in parallel to form one bridge b1, and each of the bridges b2 is formed of resistors R2, R3, and R4 having the same impedance as the one bridge b1. (b3) and (b4) are formed and interconnected to the bridge circuit unit 130; When the operation coil L connected in parallel to one bridge b1 of the bridge circuit unit 130 is disconnected, the power distributed from the power distribution unit 120 is divided into each bridge b1 and b2 of the bridge circuit unit 130. and (b3) and (b4) an operation coil disconnection display unit (140) driven by a potential difference between nodes (n1) and (n3) generated while passing through the circuit breaker. The method of claim 1, The relay contact Rs2 opened and closed to supply the power distributed by the power distribution unit 120 to the bridge circuit unit 130, and the power supplied from the power supply unit 110 may be directly supplied to the bridge circuit unit 130. The relay contact (Rs1) to be opened and closed to open and close the opening and closing the connection of one bridge (b1) and the other bridge (b2) (b4) in which the operation coil (L) and the resistance (R1) in parallel in the bridge circuit unit 130 A relay Ry for controlling the relay contacts Rs3 and Rs4; The operation switch (S1) is switched so that the power supply to the relay (Ry); the circuit breaker detection circuit of the circuit breaker operation coil, characterized in that it further comprises a relay unit (150). The method of claim 2, The one-side bridge b1, in which the operation coil L and the resistor R1 of the bridge circuit unit 130 are connected in parallel, has an impedance of the resistor R1 having a value greater than the impedance of the operation coil L. Circuit for detecting disconnection of operation coil. The method of claim 1, wherein the operation coil disconnection display unit 140 Circuit breaker detection circuit of the breaker operation coil, characterized in that made of any one of a light emitting diode or a buzzer that can be driven by the potential difference between the nodes (n1) (n3) of the bridge circuit unit (130).