KR200193053Y1 - Leakage current circuit breaker - Google Patents

Abstract

The present invention relates to a short-circuit breaker and a short circuit fault display device of a ground fault circuit breaker. An amplifier for amplifying the leakage voltage signal after conversion, a leakage signal processor for converting the AC leakage signal output from the amplifier to DC, smoothing the output voltage, and outputting the signal from the signal processor; A short circuit signal processing unit for detecting and thrusting a short circuit by three limit switches connected to each phase of a commercial AC power supply, a short circuit display unit for receiving and displaying a short circuit signal from the short circuit signal processing unit, and supplying power to each unit In case of an accident caused by short circuit or short circuit, In exactly it can determine the display time for action is reduced accident and failure recovery time.

Description

Short circuit and earth leakage classification indicator of earth leakage breaker

1 is a block diagram showing the configuration of an apparatus according to the present invention.

FIG. 2 is a detailed circuit diagram of FIG.

3 is a configuration diagram of a power supply circuit according to the present invention.

4 is a block diagram of the short circuit detection unit according to the present invention.

* Explanation of symbols for main parts of the drawings

S1, S2, S3: Input signal (L1-L3) 1: Detection unit

2 amplification unit 3 earth leakage signal processing unit

4: Earth leakage display unit 5: Short circuit signal processing unit

6: short circuit display part 7: power supply part

10: current transformer 11: amplification unit

12: diode R1-R9: resistance

C1-C3: Capacitor 13: Comparator

14, 15, 16, 17: flip-flop E1-E4: light emitting diode

21: trance

The present invention relates to a short circuit breaker and a circuit breaker display device of the ground fault breaker, and particularly to indicate the cause of the ground fault breaker operation used in the low-voltage power supply system, so that it is possible to easily identify a clear cause of an accident during the breaker operation. The present invention relates to an earth leakage accident classification display device of an earth leakage breaker capable of shortening the time required for action of a section.

In general, an existing circuit breaker is a device that cuts off power to prevent secondary accidents caused by a short circuit or a short circuit when a short circuit (including an overload) or a ground fault occurs in the load power system.

After the ground fault circuit breaker is operated, it is not possible to determine whether there is a short circuit or a short circuit.In order to discriminate the ground fault or short circuit, the inspector directly uses the tester and the insulation resistance tester to determine the accident. There was an uncomfortable problem of having to check the cause of the accident.

Therefore, the present invention is devised to solve the problems of the existing earth leakage breaker as described above, the object of the present invention is to display the cause of the earth leakage breaker operation to easily determine the clear cause of the accident during the breaker operation, Accordingly, the present invention is to provide a short circuit breaker and a circuit breaker indicating device for shortening the time required for action of the accident section.

Apparatus according to the present invention to achieve the above object is a power supply for supplying power to each part; An electric leakage detecting unit detecting an electric leakage on the load power supply side of the electric leakage breaker; An amplifier for converting the current detection signal from the ground fault detector into a voltage signal and then amplifying the signal; A short circuit signal processor for converting the output signal from the amplifier into a direct current, comparing the detected value with a set value, and determining a short circuit, and driving a short circuit display when the short circuit is determined; A ground fault display unit for displaying a ground fault according to an output signal from the ground fault signal processor; A short circuit detection unit provided between the movable plate and the movable coil of the earth leakage breaker to detect a short circuit for each phase of a commercial AC power supply; A signal processing unit for driving the display in accordance with the detection signal of the short detection unit; A signal processor for driving a corresponding display according to the output signal from the short signal processor; And a short display unit for displaying a short circuit of each phase according to the output signal from the short signal processing unit.

Hereinafter, a short circuit and a ground fault classification display device of a ground fault breaker according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention consists of two parts, a device for detecting and displaying a short circuit of the earth leakage breaker and a device for detecting and displaying a short circuit.

First, a configuration of a device for detecting and displaying a short circuit will be described. FIG. 1 is a block diagram showing the configuration of a device according to the present invention. Referring to FIG. 1, a short circuit and a short circuit fault of the ground fault breaker according to the present invention are described. The division display device includes a power supply unit 7 for supplying power to each unit, a ground fault detection unit 1 for detecting a ground fault on the load power side of the ground fault breaker, and a current detection signal from the ground fault detector 1 converted into a voltage signal. After the amplifying section 2 to amplify and the output signal from the amplifying section 2 is converted into direct current, the short circuit signal is judged by comparing the detected value with the set value to determine a short circuit, and driving the short circuit display when the short circuit is judged. And a processing unit 3 and an electric leakage display unit 4 for displaying an electric leakage in accordance with the output signal from the electric leakage signal processing unit 3.

FIG. 2 is a detailed circuit diagram of FIG. 1. Referring to FIG. 2, the image current transformer 10 corresponds to the ground fault detector 1 of FIG. 1, which detects a ground fault of the ground fault breaker. The resistor R1 is connected to switch the leakage current to voltage. The amplifier 11 is connected to the amplifier 2 of FIG. 1 which amplifies the minute detection signal of the image current transformer 10 to a level necessary for post-processing. Corresponding.

In addition, the ground fault signal processor 3 includes a diode 12 rectifying the output signal of the amplifier 11, smoothing capacitors C2 and C3 smoothing the rectified signal through the diode 12, and A comparator 13 comparing the output voltage and the set value of the smoothing capacitors C2 and C3 and one of a plurality of resistors R2 to R7 to select a set value of the comparator 13 And a flip-flop 14 for holding and outputting the output signal of the comparator 13.

In addition, the voltage amplified by the amplifier 11 is distorted waveform, in order to rectify this connects the RC circuit including the capacitor (C1) and the resistor (R2), and this rectified voltage is an alternating current garden Next, after the conversion to DC by the connected diode 12 is connected to the smoothing circuit consisting of two capacitors (C2, C3).

When the AC signal is rectified by the diode 12, the AC component remaining in the DC component is called a ripple. The ripple is reduced and then input to the connected comparator 13, and the comparator 13 has a respective One of three resistors R5-R7 having different resistance values is selected by the selector switch S4 and is compared with a set value set in connection with a + 24V power supply and the output voltage of the diode 12 is compared with the set value. If the values are the same, the display signal is configured to be output, and this signal is held and output from the flip-flop 14.

The ground fault display unit 4 is a flip-flop 14 which receives a signal from the fertilizer 12 of the ground fault signal processing unit 3 as an input terminal S and maintains the output signal as an output terminal Q, and the leakage line. And a light emitting diode E1 indicating a short circuit by a signal output from the output terminal Q of the flip-flop 14 of the signal processor 3.

Next, the configuration of the device to detect and display in a short circuit, Figure 1 is a block diagram showing the configuration of the device according to the present invention, referring to Figure 1, a short circuit and a short circuit fault of the earth leakage breaker according to the present invention The division display device is provided between the movable plate 37 and the movable coil 36 of the earth leakage breaker to detect a short circuit for each phase of a commercial AC power supply, and to drive the display according to the detection signal of the short circuit detection section. And a short circuit display section 6 for displaying a short circuit of each phase in accordance with an output signal from the short signal processing section 5.

Referring to FIG. 2, the short detection unit is composed of limit switches L1-L3 provided on R, S, and T phases to generate a short signal between the phases, as shown in FIG. Install and configure.

The short signal processor 5 is composed of flip-flops 15-17 which receive a signal from the short-circuit detection unit as an input terminal S, maintain the output signal Q, and output the same. A reset switch S5 is provided at the other input terminal R of 17). The short circuit display section 6 includes light emitting diodes E2-E4 that are driven by the output signal of the short circuit signal processing section 5 to display a short circuit.

In addition, the resistors R3, R4, R8, and R9 shown in FIG. 2 are bias resistors, and the voltage drop is adjusted to match the voltages used by the amplifier 11, the comparator 13, and the flip-flop 14-17. It is a storage for.

3 is a configuration diagram of a power supply circuit according to the present invention. Referring to FIG. 3, the AC power supply AC 200 / 440V may be connected to the bridge diode 22 and the constant voltage circuit unit 23 after the voltage drop in the power supply 21. After rectification and stabilization at (C1-C3), the ground and short circuit detection circuits of FIG.

Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings.

1 and 2, the power required for the apparatus of the present invention is supplied from the power supply unit 7. In this state, the video current transformer 10 of the leakage detecting unit 1 detects a short circuit of the ground fault circuit breaker, and this minute detection signal is converted into a voltage by the resistor R1 and then amplified to an appropriate level in the amplifier 2. do.

The waveform of the amplified voltage amplified by the amplifier 11 is distorted, and the distortion of the waveform is rectified in an RC circuit including a capacitor C1 and a resistor R2 coupled in parallel. Since the rectified voltage is an alternating current source, since the ripple is reduced in a smoothing circuit composed of two capacitors C2 and C3 after being converted from a diode 12 to a direct current, the input signal is input to the comparator 13 of the earth leakage signal processor 3. do.

The comparison unit 13 of the ground fault signal processing unit 3 sets a reference value by selecting a selection switch S4 composed of three resistors R5-R7 having different resistance values. Compares the input value and the set value, and outputs an output signal if the set value and input value are the same. The output signal is inputted to the input terminal S of the flip-flop 14 of the ground fault signal processing section 3 and maintained at the output terminal Q, whereby the light emitting diode E1 of the ground fault display section 4 is It will light up to indicate omission.

In this way, the light emitting diode E1 is held in the flip-flop 14 so that it can be continuously lit, until the reset input signal is input to the other input terminal R by the operator pressing the reset button S5. The missing display unit 4 indicates that a short circuit is occurring in the system.

Then, the limit switches L1 to L3 of the short circuit detection unit 5 detect a short circuit for each phase R, S, and T of the power supply. Referring to FIG. 4, the limit switches L1 to L3 are referred to. Specifically, it is as follows.

When the short circuit or overload of the leakage circuit breaker is operated, when the overcurrent flows to the movable coil 36, the fixing part 34 in the coil is magnetized by the overcurrent and converted into an electromagnet, and is installed in the fixing part 34 connected to the circuit breaker main body. The movable plate 37 is pulled down, and accordingly, the tribar 33 moves at the same time to operate the trip rod 31, and it is comprised so that a breaker may operate. In this way, when the short circuit breaker operates in a short circuit, the limit switches L1 to L3 are installed on each of the three phases so that the limit switches 35 operate according to this operation. A contact signal of 35) is generated.

The detection signals S1 to S3 of the limit switches L1 to L3 are input to the corresponding flip-flops 15 to 17 through the input terminal S of the short signal processing unit 5 to be maintained as the corresponding output terminals Q. The light emitting diodes E2 to E4 of the short-circuit display section 6 are turned on by the output signal of the short-circuit signal processing section 5 to indicate the occurrence of a load-side short circuit.

In this way, by displaying a short circuit detection for each phase, it is possible to display which phase, i.e., a two-phase short circuit or a three-phase short circuit, and the lit LEDs E2-E4 are the same as the missing detection circuit described above. Press the set button S5 to turn it off.

As described above, according to the present invention, it can be seen that a short-circuit accident occurred.

Meanwhile, referring to FIG. 3, a power supply voltage system is shown. The input power of the power transformer 21 draws power from the primary side of the earth leakage breaker and installs a selector switch for use with a 220V or 440V power supply. After the voltage drops to 24V in the power supply 21, the diode 22, the constant voltage circuit unit 23, and the capacitors C1 to C3 are respectively rectified and stabilized, and then provided as the voltage of each circuit unit.

As described above, this paper suggests that self-defects, aging, or artificial accidents, such as short circuits and short circuits, may occur in various installations such as motors, heaters, and light loads when the earth leakage breaker used in the low voltage power system is installed and operated. When an accident occurs, the inspector can accurately identify and display the cause of the accident, so that the conventional inspector can shorten the time taken to measure the cause of the accident after the tester and the mega, and the failure recovery time can be shortened. By separately managing within the scope, it is possible to confirm a short circuit in advance and to make an urgent action possible.

Claims (2)

An apparatus for distinguishing between a short circuit and a ground fault of a ground fault breaker, the apparatus comprising: a power supply unit supplying power to each unit; An electric leakage detecting unit detecting an electric leakage on the load power supply side of the electric leakage breaker; An amplifier for converting the current detection signal from the ground fault detector into a voltage signal and then amplifying the signal; An electric leakage signal processing unit for converting an output signal from the amplifying unit into a direct current and comparing the detected value with a set value to determine an electric leakage, and driving an electric leakage display when an electric leakage judgment is made; A ground fault display unit for displaying a ground fault according to an output signal from the ground fault signal processor; A short circuit detection unit provided between the movable plate of the earth leakage breaker and the movable coil to detect a short circuit in each phase of a commercial AC power supply; A signal processing unit for driving the display in accordance with the detection signal of the short detection unit; And an attic display unit for displaying a short circuit of each phase according to the output signal from the short circuit signal processing unit. The circuit of claim 1, wherein the earth leakage signal processor comprises: a diode rectifying the output signal of the amplifier; A smoothing capacitor for smoothing the rectified signal through the diode; A comparator for comparing the output voltage of the smoothing capacitor with a set value; A selection switch for selecting a set value of the comparator by selecting one of a plurality of resistors; And a flip-flop (14) for maintaining and outputting the output signal of the comparator.