CN102520265A

CN102520265A - Electrical equipment fault monitoring device

Info

Publication number: CN102520265A
Application number: CN201110290010XA
Authority: CN
Inventors: 傅俊豪; 傅加发; 傅汉水
Original assignee: FUJIAN JUNHAO ELECTRONICS Co Ltd
Current assignee: FUJIAN JUNHAO ELECTRONICS Co Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-06-27

Abstract

The invention relates to an electrical equipment fault monitoring device which comprises: a three-phase over-current acquisition circuit and a single-chip microcomputer control circuit. An output signal of the three-phase over-current acquisition circuit is transmitted to the single-chip microcomputer control circuit via a simulation switch circuit and an A/D data conversion circuit successively. The single-chip microcomputer control circuit controls and outputs the signal to a breaker driving circuit, a RS485 communication circuit and a carrier wave signal phase lock circuit. The output signal of the carrier wave signal phase lock circuit is sent to a carrier wave signal decoding circuit via a frequency-selecting amplifier circuit. According to the device, a three-phase current acquisition circuit is used to collect the signal; the single-chip microcomputer determines and emits a control signal; alarm information is emitted simultaneously to a duty room through a system bus and the carrier wave signal. Through combining the bus and the carrier wave signal, problems of difficult wiring and missing existed in different building group and project reconstruction can be solved. Reliable guarantee can be provided.

Description

A kind of electrical equipment malfunction monitoring device

Technical field

The present invention relates to a kind of monitoring device, particularly be a kind of electrical equipment malfunction monitoring device.

Background technology

Ancient buildings before the eighties; Electrical equipment and electric wiring overload often occurs and cause fault such as aging circuit, thus the initiation fire accident, along with the raising of economic life level; The big increase of power consumption; The incidence of electrical fire rises year by year, and according to the interrelated data statistics, existing electrical fire accounts for more than 30% of fire generation.

Summary of the invention

The objective of the invention is to overcome above-mentioned deficiency, a kind of electrical equipment malfunction monitoring device is provided.

The technical solution adopted for the present invention to solve the technical problems is: a kind of electrical equipment malfunction monitoring device; Comprise three-phase excess current Acquisition Circuit and single chip machine controlling circuit; The output signal of said three-phase excess current Acquisition Circuit transfers to single chip machine controlling circuit through analog switching circuit, A/D data converting circuit successively; Export isolating switch driving circuit, RS485 telecommunication circuit, carrier signal phase lock circuitry to by single chip machine controlling circuit control, the output signal of said carrier signal phase lock circuitry sends to the carrier signal decoding scheme through the frequency-selecting amplifier circuit.

Said single chip machine controlling circuit and watchdog circuit bidirectional data communication.

Said three-phase excess current Acquisition Circuit sends to rectification, filtering, adjustment circuit by the induced voltage signal of current transformer output and constitutes.

Said RS485 telecommunication circuit is transmitted warning message through system bus to the fire protection control center PC through SN75176 signal transmitting and receiving module.

Said carrier signal phase lock circuitry is made up of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

Said frequency-selecting amplifier circuit is made up of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio-frequency transformer (AFT) T, and sends data-signal through electric wire to the carrier signal decoding scheme through secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T.

Said carrier signal decoding scheme is made up of the audio-frequency transformer (AFT) T1, LM567 ATD U2, triode VT2 and the LED that connect successively.

Through adopting above-mentioned technical scheme; The invention has the beneficial effects as follows: the present invention adopts three-phase current Acquisition Circuit acquired signal; Send control signal through the single-chip microcomputer judgement, send warning information to duty room simultaneously, combine to have solved with carrier signal through adopting bus through system bus and carrier signal; Different building groups and project reconstruction exist difficult wiring and the problem of avoiding failing to report, and more reliable guarantee is provided.

Description of drawings

Fig. 1 is a frame assumption diagram of the present invention;

Fig. 2 is circuit theory diagrams of the present invention.

Embodiment

As shown in Figure 1; A kind of electrical equipment malfunction monitoring device of the present invention; Comprise three-phase excess current Acquisition Circuit 1 and single chip machine controlling circuit 2; The output signal of said three-phase excess current Acquisition Circuit 1 transfers to single chip machine controlling circuit 2 through analog switching circuit 11, A/D data converting circuit 12 successively; Export isolating switch driving circuit 3, RS485 telecommunication circuit 4, carrier signal phase lock circuitry 5 to by single chip machine controlling circuit 2 controls, the output signal of said carrier signal phase lock circuitry 5 sends to carrier signal decoding scheme 7 through frequency-selecting amplifier circuit 6, said single chip machine controlling circuit 2 and watchdog circuit 8 bidirectional data communications.

As shown in Figure 2, form the overcurrent signal Acquisition Circuit by current sensor L3, potentiometer W1, diode D1, capacitor C 1, capacitor C 2, resistance R 1, resistance R 2 etc., when phase line is passed current sensor L3 and had electric current to pass through; L3 level of current sensor two ends produce the ac induction voltage signal, and after potentiometer W1 adjustment, diode D1 is rectified into d. c. voltage signal; After signal Processing such as filtering, be input to the 4th pin of 4051 analog switching circuit IC2, form datel circuit by the 9th, 10,11 pin of 4051 analog switching circuit IC2 and the 24th, 25,26 pin of single-chip microcomputer IC1; Switch 4051 analog switching circuit IC2 by single-chip microcomputer IC1 control and switch way, by the 3rd pin output switching signal of 4051 analog switching circuit IC2, this signal is input to the 2nd pin of A/D data converter IC3 respectively; Form datel circuit through the 5th, 6,7 pin of A/D data converter IC3 and the 35th, 36,37 pin of single-chip microcomputer IC1, read A/D data converter IC3 current data information through single-chip microcomputer IC1, when the 3rd pin B point current potential of 4051 analog switching circuit IC2; When reading setting value above single-chip microcomputer IC1 inside, after single-chip microcomputer IC1 internal processes is judged, send control signal because of load current; First via output is by the 8th pin output high level of single-chip microcomputer IC1; Through resistance R 8 current limlitings, make triode Q1 conducting, the relay J adhesive; Its contact J-1 is by transferring normally closed point normal battle to; Isolating switch shunt opening circle gets electric, promotes isolating switch KM dropout separating brake, the safety of protection consumer and supply line; The second tunnel output is formed the RS485 datel circuit by resistance R 8, the 1st, 2,3,4 pin of SN75176 signal transmitting and receiving module I C5 communication interface circuit and the 10th, 11,27 pin of single-chip microcomputer IC1; Transfer two buses to by the 6th, 7 of SN75176 signal transmitting and receiving module I C5 and be connected to PC; Send driving data information by single-chip microcomputer IC1 to SN75176 signal transmitting and receiving module I C5; Be connected to PC through system bus, promote PC and show current fault status information; Third Road output is formed phase lock circuitry by the multivibrator that LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof constitute; Its oscillation frequency is by the parameter determining of electric capacity 2C1, resistance 2R1, and carrier frequency is adjusted in the 150-300KHZ scope.Elementary L1, electric capacity 2C2, capacitor 2C3 by triode VT1, audio-frequency transformer (AFT) T constitute the frequency-selecting amplifier circuit; The 33rd pin output high level signal by single-chip microcomputer IC1; Make LM567 tone decoder U1 obtain working power; LM567 tone decoder U1 starts working; Be coupled on local telephone network speaking wire or the AC network AC220V power lead and send by secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T, send data-signal, constitute the carrier signal decoding scheme by the audio-frequency transformer (AFT) T1, LM567 ATD U2, triode VT2, the LED that connect successively to the carrier wave main frame; The time constant of resistance 1R1, electric capacity 1C5 network has determined the voltage controlled oscillator of LM567 ATD U2; When the carrier wave extension set when main frame sends 150-300KHZ carrier wave command signal, be coupled to the secondary L3 of audio-frequency transformer (AFT) T through electric capacity 1C1, audio-frequency transformer (AFT) T1, its secondary L3, electric capacity 1C2, electric capacity 1C3 form a carrier wave frequency selection network.Signal after the frequency-selecting is coupled to the 3rd pin signal input part of LM567 ATD U2 through electric capacity 1C4, after LM567 ATD U2 decoding, by its 8th pin output terminal output low level; Make triode VT2 conducting, LED is lighted, and has received the carrier data signal of extension set; Explain electric fault takes place; Reach the real time remote on-line monitoring, collection carrier signal and the dual monitoring of system bus avoid failing to report and having solved the relevant difficult technical barrier that connects up.

The principle of work of current sensor L2, L3 is identical with the principle of work of current sensor L1, no longer repeats here.

Above-describedly be merely a preferred embodiment of the present invention, can not limit the scope that this practicality is implemented, every equalization of doing according to claim of the present invention changes and decorates, and all should still belong to the scope that the present invention is contained.

Claims

1. electrical equipment malfunction monitoring device; It is characterized in that: comprise three-phase excess current Acquisition Circuit (1) and single chip machine controlling circuit (2); The output signal of said three-phase excess current Acquisition Circuit (1) transfers to single chip machine controlling circuit (2) through analog switching circuit (11), A/D data converting circuit (12) successively; Export isolating switch driving circuit (3), RS485 telecommunication circuit (4), carrier signal phase lock circuitry (5) to by single chip machine controlling circuit (2) control, the output signal of said carrier signal phase lock circuitry (5) sends to carrier signal decoding scheme (7) through frequency-selecting amplifier circuit (6).

2. a kind of electrical equipment malfunction monitoring device according to claim 1 is characterized in that: said single chip machine controlling circuit (2) and watchdog circuit (8) bidirectional data communication.

3. a kind of electrical equipment malfunction monitoring device according to claim 1 is characterized in that: said three-phase excess current Acquisition Circuit (1) sends to rectification, filtering, adjustment circuit by the induced voltage signal of current transformer output and constitutes.

4. a kind of electrical equipment malfunction monitoring device according to claim 1 is characterized in that: said RS485 telecommunication circuit (4) is transmitted warning message through system bus to the fire protection control center PC through SN75176 signal transmitting and receiving module.

5. a kind of electrical equipment malfunction monitoring device according to claim 1 is characterized in that: said carrier signal phase lock circuitry (5) is made up of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

6. a kind of electrical equipment malfunction monitoring device according to claim 1; It is characterized in that: said frequency-selecting amplifier circuit (6) is made up of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio-frequency transformer (AFT) T, and sends data-signal through electric wire to carrier signal decoding scheme (7) through secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T.