CN202172264U - Zero line monitoring device - Google Patents

Abstract

The utility model relates to a monitoring device, in particular to a zero-line monitoring device, which includes a three-phase power detection circuit, a single-chip microcomputer control circuit, an alarm circuit, a circuit breaker drive circuit and a wireless transceiver circuit. The three-phase power detection circuit The collected signal is sent to the single-chip control circuit through the optocoupler isolation circuit, and the single-chip control circuit controls the output to the alarm circuit, circuit breaker drive circuit and wireless transceiver circuit. After being judged by the single-chip microcomputer, an alarm signal is sent until the power supply is cut off, thereby protecting the safety of the electrical equipment, and an alarm signal is sent to the receiving host through the wireless transmitting module, and the on-duty personnel is notified to maintain in time.

Description

Zero line monitoring device

technical field

The utility model relates to a monitoring device, in particular to a zero line monitoring device.

Background technique

In the low-power distribution system, the circuit breaker is divided into 3 poles or 4 poles, of which 4 poles are connected and disconnected including the neutral line. Due to long use time or many times of switching, the internal neutral line contact of the circuit breaker will also be damaged. Poor contact or non-connection phenomenon, which leads to a serious unbalance of three-phase voltage in single-phase negative load. The neutral line is called the common terminal of the three-phase phase line. If the phase voltage is too high or too low, the electrical equipment will be burned out and an electrical fire will occur.

Utility model content

The purpose of the utility model is to overcome the above disadvantages and provide a zero line monitoring device.

The technical scheme adopted by the utility model to solve its technical problems is: a zero line monitoring device, including a three-phase power supply detection circuit, a single-chip microcomputer control circuit, an alarm circuit, a circuit breaker drive circuit and a wireless transceiver circuit, and the three-phase power supply detection circuit collects The signal is sent to the single-chip microcomputer control circuit through the optocoupler isolation circuit, and the single-chip microcomputer control circuit controls the output to the alarm circuit, circuit breaker drive circuit and wireless transceiver circuit.

The three-phase power supply detection circuit is formed by connecting the output ends of the three-phase live wires to the input ends of the circuit breaker, and the output ends of the neutral wires connected to the output ends of the circuit breaker.

The output signal of the circuit breaker is sequentially processed by the step-down capacitor, the voltage divider resistor, the rectifier diode, the filter capacitor, and the voltage regulator diode.

The wireless transceiver circuit is composed of an FDD-5 transmitting module, a JDD-5 receiving module, an external light-emitting diode and a loudspeaker connected to the JDD-5 receiving module.

By adopting the above-mentioned technical scheme, the beneficial effect of the utility model is: when the output terminal and the input terminal of the zero line of the circuit breaker are in a non-conductive state, after the judgment of the single-chip microcomputer, an alarm signal is sent until the power supply is cut off, thereby protecting the electrical equipment safety, and send an alarm signal to the receiving host through the wireless transmitter module, and notify the on-duty personnel to maintain in time.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a schematic circuit diagram of the utility model.

Detailed ways

As shown in Figure 1, the zero line monitoring device of the present utility model includes a three-phase power supply detection circuit 1, a single-chip microcomputer control circuit 2, an alarm circuit 3, a circuit breaker drive circuit 4 and a wireless transceiver circuit 5, and the three-phase power supply detection circuit 1. The collected signal is sent to the single-chip microcomputer control circuit 2 through the optocoupler isolation circuit 11, and the single-chip microcomputer control circuit 2 controls the output to the alarm circuit 3, the circuit breaker driving circuit 4 and the wireless transceiver circuit 5.

As shown in FIG. 2 , the three live wires of the three phases are respectively connected to the input end of the circuit breaker CM1 , and the neutral wire N is connected to the output end of the circuit breaker CM1 . The detection circuit is composed of capacitor C1, resistor R1, diode D1, capacitor C2, voltage regulator DW, resistor R2, resistor R3, etc. When the circuit breaker CM1 is closed, the live wire L1 and the neutral wire N form an AC220V AC voltage loop, and the live wire L1 is stepped down by capacitor C1, divided by resistor R1, rectified by diode D1, filtered by capacitor C2, and stabilized by voltage regulator DW. This voltage signal is sent to photocoupler U1 to make it conductive, and its output is a low-level signal. The 38th pin I/O port of the microcontroller IC1 input through the resistor 3R2 is also in a low level state, indicating that the neutral line of the circuit breaker CM1 is in a normal power supply state, and no control signal is issued after the internal program of the microcontroller IC1 is judged.

When the circuit breaker CM1 is closed, the live line L1 and the neutral line N do not form an AC220V AC voltage circuit, the live line L1 has no step-down through the capacitor C1, and the regulator DW has no voltage stabilization signal output, and this signal is sent to the photocoupler U1, the photocoupler U1 is in the cut-off state, and its output terminal is a high-level signal, which is input to the 38th pin I/O port of the microcontroller IC1 through the resistor 3R2 and is also in a high-level state, indicating that the neutral line of the circuit breaker CM1 is not connected In the power supply state, the internal program of the single-chip microcomputer IC1 comprehensively judges that it is "off zero". "Sound; it means that the voltage at the output terminal is abnormal; the second output is the high level output by pin 35 of the single chip microcomputer IC1, and the current is limited by the resistor 3R9, so that the triode Q1 is turned on, the relay J is pulled in, and its contact J-1 is turned on by the normal Turn on and turn to normally closed, push the circuit breaker CM1 shunt coil to trip and cut off the power, to ensure the safety of electrical equipment; the third output is a high-level signal output by the 25th pin of the single-chip microcomputer IC1, and the current is limited by the resistor 3R8, so that the triode VT1 is turned on, input to the 2nd pin of FDD-5 transmitting module IC2, and sent to its 3rd pin CP modulation signal input terminal, to modulate the transmitted high-frequency signal, the antenna TX is to JDD-5 receiving module IC3 Transmit modulated high-frequency electromagnetic waves, the 4th pin CPA audio signal output terminal of JDD-5 receiving module IC3 directly drives the ordinary electric speaker Y to make an alarm sound, and at the same time its 2nd pin data output terminal outputs a high level to make the light-emitting diode LED1 Lighting up means receiving the alarm signal from the extension, displaying the fault state, and reaching the monitoring alarm.

The above is only a preferred embodiment of the utility model, and can not limit the scope of the utility model implementation. All equal changes and decorations made according to the patent scope of the utility model should still belong to the scope covered by the utility model Inside.

Claims (4)

1. zero line supervising device; It is characterized in that: comprise three phase mains testing circuit (1), single chip machine controlling circuit (2), warning circuit (3), circuit breaker drive circuit (4) and wireless transceiver circuit (5); The signal that said three phase mains testing circuit (1) is gathered sends to single chip machine controlling circuit (2) through optical coupling isolation circuit (11), exports warning circuit (3), circuit breaker drive circuit (4) and wireless transceiver circuit (5) to by single chip machine controlling circuit (2) control.

2. zero line supervising device according to claim 1 is characterized in that: said three phase mains testing circuit (1) is connected to the input of circuit breaker by the live wire output of three-phase, and the output that the output of zero line is connected in circuit breaker constitutes.

3. zero line supervising device according to claim 2 is characterized in that: the output signal of said circuit breaker is successively through decompression capacitor, divider resistance, rectifier diode, filter capacitor, voltage stabilizing didoe signal processing.

4. zero line supervising device according to claim 1 is characterized in that: said wireless transceiver circuit (5) is made up of FDD-5 transmitter module, JDD-5 receiver module, external light-emitting diode and the loud speaker of JDD-5 receiver module.

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