CN101581748A - Zinc oxide arrester on-line monitoring system - Google Patents
Zinc oxide arrester on-line monitoring system Download PDFInfo
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- CN101581748A CN101581748A CNA200910303568XA CN200910303568A CN101581748A CN 101581748 A CN101581748 A CN 101581748A CN A200910303568X A CNA200910303568X A CN A200910303568XA CN 200910303568 A CN200910303568 A CN 200910303568A CN 101581748 A CN101581748 A CN 101581748A
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Abstract
The invention relates to a zinc oxide arrestor on-line monitoring system which comprises a microprocessor which is respectively connected with an A/D converting unit, a lightning stroke counting module and a GPRS communication module; the A/D converting unit is respectively connected with a leakage current sampling module and a voltage sampling module; the structure of the microprocessor comprises input/output interfaces, a counter and a serial communication interface; the input/output interfaces are connected with the A/D converting unit; the counter is connected with the lightning stroke counting module; the microprocessor is connected with the GPRS communication module; the microprocessor adopts a FPGA chip EPIC6Q240C8. The monitoring system dynamically monitors the insulating property of the zinc oxide arrestor under the operating voltage; the test results are accurate and reliable; the testing process is simple; and the test period is short; the zinc oxide arrestor on-line monitoring system is not easy to be affected by artificial and external factors, can provide long term data information of operation and performance deterioration of the zinc oxide arrestor, and has better practical value.
Description
Technical field
The invention belongs to the electrical property monitoring technical field, relate to a kind of system of on-line monitoring lightning arrester insulation performance, be specifically related to a kind of Zinc oxide arrester on-line monitoring system.
Background technology
Lightning arrester is one of important protection equipment that guarantees safe operation of power system, is mainly used in lightning surge that restriction transmitted by circuit or the internal overvoltage that is caused by operation.
The silit lightning arrester is because of its outstanding advantage on lightning protection properties, the high-tension apparatus that is widely used in electric system, but there is following shortcoming in it: the one, have only thunder and lightning maximum amplitude voltage-limiting protection function, and there is not thunder and lightning steep wave defencive function, the lightning protection function is incomplete; The 2nd, there is not continuous thunder and lightning surge protection ability; The 3rd, the acting characteristic poor stability is endangered by transient overvoltage may; The 4th, operating duty is heavy, and serviceable life is short etc.Above-mentioned shortcoming causes the silit lightning arrester in use, has the hidden danger that influences power system security.
Non-linear volt-ampere characteristic, volume that Zinc-Oxide Arrester (MOA) has excellence are little, in light weight, and discharge capacity is big, and its protection feature is better than silicon carbide valve type arrester.Adopt Zinc-Oxide Arrester can significantly reduce the insulating Design level of protected power equipment, obviously reduce equipment investment, improve power supply reliability.In the use, because of bearing power-frequency voltage, surge voltage and the influence of various external environmental factor for a long time, it is aging that Zinc-Oxide Arrester is tending towards, and its insulation characterisitic is destroyed, cause Zinc-Oxide Arrester ineffective and cause the power equipment thermal runaway, even blast.Thereby, normally play a role for guaranteeing lightning arrester, need the performance state of lightning arrester regularly be detected.
At present, to the detection of lightning arrester performance state, be regularly to detect on the spot to the scene by the testing staff, promptly regularly have a power failure lightning arrester is carried out preventive trial.There is following defective in this detection mode:
Planned power failure needs when 1) testing to have a power failure: even also can bring certain influence to production.The back device temperature that has a power failure reduces, and test result often can not reflect truth.Studies show that about 58.5% equipment is difficult to make correct judgement according to the low-temperature test result.
2) morning newspaper or wrong report: the trial voltage that regular interruption maintenance applies is generally at 10KV and following, voltage when being lower than the lightning arrester operation, and because the duration of test outage, situation about being reflected and actual conditions differ bigger, the insulating property and the working condition that can't reflect lightning arrester under the working voltage in real time, thereby the result of diagnosis may not realistic running status, and it is qualified that preventive trial once repeatedly took place, and the situation that lightning arrester burns out, explodes.
3) recondition expense height: the material resources that drop into during the preventive trial, financial resources and manpower are bigger, and the test procedure complexity, workload is big, the time is concentrated, and testing result is subject to the human factor influence.
4) test period long, can not in time find, diagnose out some to develop fault faster.Therefore, even equipment has passed through preventative detection, there is fault to take place in the time of still.
In view of above problem, the mode of charged detection has been proposed, promptly adopt insulated on-line monitoring and diagnostic techniques, explore state maintenance system based on on-line monitoring.So-called insulated on-line monitoring be meant at lightning arrester do not have a power failure, not under the running status of detachment system, utilize advanced Digital Signal Processing and method for diagnosing faults to the insulation status of lightning arrester carry out automatically, continuously or insulation characterisitic regularly detect and supervise, understand and grasp lightning arrester and whether be in normal operating condition, so that determine whether detected lightning arrester needs to overhaul and how to overhaul.
Under working voltage, electrical equipment is carried out the monitoring of duty, can truly reflect the running status of electrical equipment, reduce the loss that has a power failure and bring.But the characteristic quantity of tested electrical equipment electric abnormal information under working voltage is very faint, vary within wide limits, be subject to on-the-spot electromagnetic interference (EMI), make collection, transmission, processing and the diagnosis of this abnormal information than the monitoring complexity of Operation of Electric Systems parameter many, cause the speed of development of electrical equipment duty dynamic monitoring slower.
Along with the development and the application of modern sensor technology, computer technology and the information processing technology, make electrical equipment online monitoring technology and diagnostic techniques be achieved.Application in Fault Diagnosis for Electrical Equipment also more and more comes into one's own.With the preventive trial system to set up process the same, by after using, promote, sum up and improving, will make status of electric power inspection standard based on on-line monitoring, progressively set up perfect POWER SYSTEM STATE inspection and repair system.
Summary of the invention
The purpose of this invention is to provide a kind of Zinc oxide arrester on-line monitoring system, insulating property to lightning arrester under working voltage are carried out dynamic monitoring, test result accurately and reliably, and test process is simple, the test period is short, be not subject to the influence of artificial and extraneous factor.
The technical solution adopted in the present invention is, Zinc oxide arrester on-line monitoring system, comprise microprocessor, microprocessor respectively with the A/D converting unit, the counting thunder module is connected with the GPRS communication module, the A/D converting unit is connected with the voltage sample module with the leakage current sampling module respectively, be provided with input/output interface in the structure of microprocessor, counter and serial communication interface, input/output interface is connected with the A/D converting unit, counter is connected with the counting thunder module, serial communication interface is connected with the GPRS communication module, and microprocessor adopts fpga chip EP1C6Q240C8.
Monitoring system of the present invention is utilized the wireless transmission advantage of GPRS, monitoring information is converted to digital signal to be transferred in monitoring center's server end database by the GPRS module, make managerial personnel conveniently inquire about the resistive current component value of MOA and time numerical value that is struck by lightning, understand the running state information of MOA in real time in client.Advantage in conjunction with fundamental harmonic wave method and two " AT " methods, the accurate detection of resistive leakage current when having realized the MOA charging operation, by the liquid crystal display displays testing result, information translation with monitoring is that digital signal is transferred in monitoring center's server end database by the GPRS module simultaneously, managerial personnel can conveniently inquire about MOA resistive current component value and thunderbolt time numerical value in client, understand the running status of MOA.Total system is simple to operate, monitors convenient and swiftly, and it is bulky to have overcome existing testing tool, and unhandy shortcoming can provide the long-term data of Zinc-Oxide Arrester operation and performance degradation, and good practical values is arranged.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of detection system of the present invention;
Fig. 2 is the structural representation of voltage sample module in the monitoring system of the present invention;
Fig. 3 is the structural representation of leakage current sampling module in the monitoring system of the present invention;
Fig. 4 is the structural representation of counting thunder module in the monitoring system of the present invention;
Fig. 5 is the main program flow block diagram of monitoring system of the present invention.
Among the figure, 1. microprocessor, 2.A/D converting unit, 3. leakage current sampling module, 4. voltage sample module, 5. counting thunder module, 6.GPRS communication module, 7. LCD, 8. random access memory, 9. Zinc-Oxide Arrester.
Wherein, 1-1. input/output interface, 1-2. general I/O port, 1-3. counter, 1-4. serial communication interface, 3-1. leakage current sensor, 3-2. voltage dependent resistor (VDR), 3-3. operational amplifier A, 3-4. operational amplifier B, 4-1. mutual inductor, 4-2. active operational amplifier, 5-1. mutual inductor, 5-2.ACAC transducer, 5-3. photo-coupler, the 5-4. phase-reversing tube.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The structure of a kind of embodiment of monitoring system of the present invention, as shown in Figure 1.Comprise microprocessor 1, letter microprocessor 1 is connected with A/D converting unit 2, counting thunder module 5, GPRS communication module 6, LCD 7 and random access memory 8 respectively, and A/D converting unit 2 is connected with voltage sample module 4 with leakage current sampling module 3 respectively.Be provided with input/output interface 1-1, general I/O port 1-2, counter 1-3 and serial communication interface 1-4 in the structure of microprocessor 1; Input/output interface 1-1 is connected with A/D converting unit 2, general I/O port 1-2 is connected with random access memory 8 with LCD 7 respectively, counter 1-3 is connected with counting thunder module 5, and serial communication interface 1-4 is connected with GPRS communication module 6.
A/D converter 2, be used to receive the signal of leakage current sampling module 3 and 4 conveyings of voltage sample module, the signal that receives is carried out A/D conversion back input microprocessor 1, be used to receive the instruction of microprocessor 1 transmission, and the instruction that will receive is transferred to leakage current sampling module 3 and voltage sample module 4 respectively;
The BCT-2 type electromagnetic type punching small electric current sensor that leakage current sampling module 3 adopts based on active zero magnetic flux technology, be used to receive the instruction of A/D converter 2 inputs, and according to the leakage current signal of the instruction acquisition lightning arrester that receives, with the leakage current signal input a/d converter of gathering 2;
Voltage sample module 4 is used to receive the instruction of A/D converter 2 inputs, and according to the voltage signal of the instruction acquisition lightning arrester that receives, with the voltage signal input a/d converter of gathering 2;
The structure of voltage sample module 4 in the monitoring system of the present invention, as shown in Figure 2.Comprise mutual inductor 4-1, mutual inductor 4-1 adopts miniature current mode voltage transformer (VT).Connect with resistance R 1 in the upper end of a winding of mutual inductor 4-1, be added with phase voltage between the lower end of a resistance R 1 and a winding of mutual inductor 4-1, resistance R 1 is a current-limiting resistance, the upper end of mutual inductor 4-1 Secondary Winding is connected with the positive input of active operational amplifier 4-2, the lower end of mutual inductor 4-1 Secondary Winding is connected with the reverse input end of active operational amplifier 4-2, between mutual inductor 4-1 and the active operational amplifier 4-2, be parallel with diode D1 and diode D2 by mutual inductor 4-1 successively to active operational amplifier 4-2, the positive pole of diode D1 is connected with the upper end of mutual inductor 4-1 Secondary Winding, the negative pole of diode D1 is connected with the lower end of mutual inductor 4-1 Secondary Winding, the negative pole of diode D2 is connected with the upper end of mutual inductor 4-1 Secondary Winding, the positive pole of diode D2 is connected with the lower end of mutual inductor 4-1 Secondary Winding, be in series with resistance R 2 between the positive input of active operational amplifier 4-2 and the output terminal, the output terminal of active operational amplifier 4-2 also is connected with an end of capacitor C, the other end ground connection of capacitor C.
The secondary side of electric system mesohigh circuit has formed AC (interchange) the 100V voltage and the 5A electric current of standard, but what get from the wiring of PT secondary side is the ac voltage signal of 100V, is not suitable for follow-up comparison and collection.According to monitoring principle, phase voltage when needing to gather Zinc-Oxide Arrester 9 operations, resistance R 1 in the voltage sample module 4 is carried out current limliting with the AC100V voltage of standard, and with the input of the voltage signal after current limliting mutual inductor 4-1, mutual inductor 4-1 carries out isolation filter to the voltage signal that receives, make the linearity of this voltage signal and the accuracy requirement that angular difference satisfies system, then, voltage signal processed is imported preposition active operational amplifier 4-2, active operational amplifier 4-2 amplifies back output to the voltage signal that receives, can at active operational amplifier 4-2 output terminal obtain desired voltage output by regulating the feedback resistance R2 of active operational amplifier 4-2 this moment.
Shown in Figure 3 is the structure of leakage current sampling module 3 in the monitoring system of the present invention.Comprise leakage current sensor 3-1, leakage current sensor 3-1 adopts the BCT-2 type electromagnetic type punching small electric current sensor based on active zero magnetic flux technology.Leakage current sensor 3-1 is in parallel with voltage dependent resistor (VDR) 3-2, constitutes parallel circuit, and an end of this parallel circuit is connected with an end of resistance R 1, the other end ground connection of parallel circuit; The other end of resistance R 1 is connected with the reverse input end of operational amplifier A 3-3, the reverse input end of operational amplifier A 3-3 also is connected with an end of resistance R 2 and the output terminal of operational amplifier A 3-3 respectively, the positive input of operational amplifier A 3-3 is connected with resistance R 3, resistance R 3 ground connection; Operational amplifier A 3-3 output terminal be connected with an end of resistance R 5, the other end of resistance R 5 is connected with the reverse input end of operational amplifier B3-4, be in series with resistance R 7 between the output terminal of the reverse input end of operational amplifier B3-4 and operational amplifier B3-4, the positive input of operational amplifier B3-4 is connected with resistance R 6, resistance R 6 ground connection; Two bypasses of operational amplifier B3-4 output terminal are connected with diode D1 and diode D2 respectively, the positive pole of the negative pole of diode D1 and diode D2 is connected with the output terminal of operational amplifier B3-4 respectively, the positive pole of diode D1 meets DGND, and the negative pole of diode D2 meets VCC.Leakage current sensor 3-1 is connected on the ground wire of Zinc-Oxide Arrester 9.
In data collecting field, the acquiring and processing method of middle signal and large-signal is comparative maturity, and the collection of small-signal and data processing do not have fixed mode.Small-signal itself is fainter, usually is submerged in the noise that external interference and self produce, the collection that causes small-signal with separate very difficult.The leakage current of Zinc-Oxide Arrester 9 is little electric currents of milliampere level even microampere order, in order accurately to reflect the leakage current of Zinc-Oxide Arrester 9, basic demand to small electric current sensor is as follows: (1) can adapt to the requirement of measuring little electric current (milliampere level), highly sensitive, secondary singal should be big as much as possible simultaneously; (2) good at measurement range internal linear degree, output waveform does not distort, and ratio difference, angular difference between output signal and the measured signal are little, and its difference is stable, and the variation with other factors does not change; (3) good operating stability, temperature coefficient is little and stable, and is simple in structure, and volume is little, has electro-magnetic screen function, and Electro Magnetic Compatibility is good.Therefore, leakage current sensor 3-1 in this monitoring system leakage current sampling module 3 adopts the BCT-2 type electromagnetic type punching small electric current sensor based on active zero magnetic flux technology, it is installed on the ground wire of Zinc-Oxide Arrester 9, the leakage current of Zinc-Oxide Arrester 9 is sampled.And adopt operational amplifier to put capable signal condition into.The 2.5V voltage that operational amplifier in-phase input end (being the input end of resistance R 2) provides for precision voltage source is as the reference voltage of lift level.Diode D1 and diode D2 shield, and need the assurance voltage limit in 3.3V, can select 1N4001 for use.Voltage dependent resistor (VDR) 3-2 clamper input terminal voltage can not surpass set-point.
The structure of counting thunder module 5 in the monitoring system of the present invention, as shown in Figure 4, comprise mutual inductor 5-1, the end of mutual inductor 5-1 is connected with the positive pole of diode D1 and the positive pole of diode D2 respectively, the negative pole of diode D1 is connected with capacitor C 1, the negative pole of diode D2 respectively with capacitor C 2, one end of resistance R 1 is connected with an end of resistance R 2, the other end of resistance R 2 is connected with the pin 3 of ACAC transducer 5-2 and the positive pole of diode D3 respectively, the negative pole of diode D3 is connected with the negative pole of diode D4, the positive pole of diode D4, the other end of resistance R 1, capacitor C 2, the other end of capacitor C 1 and mutual inductor 5-1 is connected with the pin 2 of ACAC transducer 5-2 respectively, capacitor C 1 adopts high withstand voltage electric capacity, and diode D1 and diode D2 adopt fast recovery diode.Resistance R 1 is a voltage dependent resistor (VDR), and resistance R 2 is a cement resistor.
The pin 1 of ACAC transducer 5-2 is connected with the negative pole of capacitor C 3, voltage stabilizing diode VD1, the negative pole of voltage stabilizing diode VD2 and an end of resistance R 3 respectively, and the other end of resistance R 3 is connected with the positive pole of light emitting diode and the negative pole of diode D5 among the photo-coupler 5-3 respectively; The negative pole of light emitting diode is connected with the pin 4 of ACAC transducer 5-2 respectively among the positive pole of the positive pole of the positive pole of capacitor C 3, voltage stabilizing diode VD1, voltage stabilizing diode VD2, diode D5 and the photo-coupler 5-3.
The base stage of phototriode connects 5V voltage among the photo-coupler 5-3, the emitter of this light emitting transistor is ground connection and capacitor C 4 respectively, capacitor C 4 is in parallel with resistance R 4, resistance R 4 connects the collector of phototriode among the photo-coupler 5-3, the collector of this light emitting transistor also is connected with the pin 1 of phase-reversing tube 5-4, the pin 2 of phase-reversing tube 5-4 respectively with capacitor C 5, the negative pole of diode D6, the positive pole of diode D7 is connected with the negative pole of voltage stabilizing diode VD3, the positive pole that the positive pole of capacitor C 5 and voltage stabilizing diode VD3 is received diode D6 respectively meets DGND, and the negative pole of diode D7 connects 3.3V voltage.
The thunderbolt action of high voltage is in Zinc-Oxide Arrester 9; in Zinc-Oxide Arrester 9, produce electric current; this electric current flows into counting thunder module 5; the electric current of 5 pairs of inflows of counting thunder module carries out the rectification amplitude limiting processing earlier; current signal is after treatment transmitted by photoelectrical coupler 5-3; photoelectrical coupler 5-3 plays the effect of insulation blocking when transmitting current signal; the current signal of photoelectrical coupler 5-3 output is counted as interruption pulse by the counter 1-3 that phase inverter 5-4 delivers to microprocessor 1.When the counting input pulse takes place highly during to low negative saltus step (negative edge triggering), counter 1-3 adds " 1 ".Number of times is delivered to microprocessor 1, and microprocessor 1 adds up to the thunderbolt number of times on original basis.
The main program flow chart of monitoring system of the present invention as shown in Figure 5, is delivered to A/D converting unit 2 after current signal process I/V conversion, amplification and the filtering that leakage current sensor 3-1 records and is carried out sample conversion; The while phase signal is delivered to microprocessor 1 and is carried out computing, draw the cosine value of angle, the result of A/D conversion also sends into microprocessor 1 and carries out computing, then, two result of calculations are multiplied each other, draw the current in resistance property value, because alternate interference, adopt the software phase-shifting method to carry out phase shift and handle, phase place is finely tuned.During thunderbolt pulse signal input microprocessor 1, to the control of voltage dependent resistor (VDR) 3-2, the computation process of current in resistance property stops, at this moment, and the counting of the pulse of being struck by lightning.
The course of work of monitoring system of the present invention:
This monitoring system insulating property to Zinc-Oxide Arrester 9 under working voltage are carried out dynamic monitoring, test result accurately and reliably, test process is simple, the test period is short, it is artificial not to be subject to and the influence of extraneous factor.Total system is simple to operate, monitors convenient and swiftly, and it is bulky to have overcome existing testing tool, unhandy shortcoming, and can provide the long-term data of Zinc-Oxide Arrester operation and performance degradation, good practical values is arranged.
Claims (7)
1. Zinc oxide arrester on-line monitoring system, it is characterized in that, comprise microprocessor (1), microprocessor (1) respectively with A/D converting unit (2), counting thunder module (5) is connected with GPRS communication module (6), A/D converting unit (2) is connected with voltage sample module (4) with leakage current sampling module (3) respectively, be provided with input/output interface (1-1) in the structure of described microprocessor (1), counter (1-3) and serial communication interface (1-4), input/output interface (1-1) is connected with A/D converting unit (2), counter (1-3) is connected with counting thunder module (5), serial communication interface (1-4) is connected with GPRS communication module (6), and described microprocessor (1) adopts fpga chip EP1C6Q240C8.
2. according to the described monitoring system of claim 1, it is characterized in that the structure of described microprocessor (1) also comprises general I/O port (1-2), general I/O port (1-2) is connected with random access memory (8) with LCD (7) respectively.
3. according to the described monitoring system of claim 1, it is characterized in that, the structure of described leakage current sampling module (3): leakage current sensor (3-1) constitutes parallel circuit with voltage dependent resistor (VDR) (3-2), one end of this parallel circuit is connected with an end of resistance R 1, the other end ground connection of parallel circuit, the other end of resistance R 1 is connected with the reverse input end of operational amplifier A (3-3), the reverse input end of operational amplifier A (3-3) is connected with an end of resistance R 2 and the output terminal of operational amplifier A (3-3) respectively, the positive input of operational amplifier A (3-3) is connected with resistance R 3, resistance R 3 ground connection, operational amplifier A (3-3) output terminal be connected with an end of resistance R 5, the other end of resistance R 5 is connected with the reverse input end of operational amplifier B (3-4), be in series with resistance R 7 between the output terminal of the reverse input end of operational amplifier B (3-4) and operational amplifier B (3-4), the positive input of operational amplifier B (3-4) is connected with resistance R 6, resistance R 6 ground connection, two bypasses of operational amplifier B (3-4) output terminal are connected with diode D1 and diode D2, the negative pole of diode D1 and diode respectively
The positive pole of D2 is connected with the output terminal of operational amplifier B (3-4) respectively, and the positive pole of diode D1 meets DGND, and the negative pole of diode D2 meets VCC.
4. according to the described monitoring system of claim 3, it is characterized in that described leakage current sensor (3-1) adopts the BCT-2 type electromagnetic type punching small electric current sensor based on active zero magnetic flux technology.
5. according to the described monitoring system of claim 1, it is characterized in that, the structure of described voltage sample module (4): comprise mutual inductor (4-1), on the winding of mutual inductor (4-1), be added with phase voltage between the lower end, the upper end of a winding of mutual inductor (4-1) is in series with resistance R 1, the upper end of mutual inductor (4-1) Secondary Winding is connected with the positive input of active operational amplifier (4-2), the lower end of mutual inductor (4-1) Secondary Winding is connected with the reverse input end of active operational amplifier (4-2), between mutual inductor (4-1) and the active operational amplifier (4-2), be parallel with diode D1 and diode D2 by mutual inductor (4-1) successively to active operational amplifier (42), the positive pole of diode D1 is connected with the upper end of mutual inductor (4-1) Secondary Winding, the negative pole of diode D1 is connected with the lower end of mutual inductor (4-1) Secondary Winding, the negative pole of diode D2 is connected with the upper end of mutual inductor (4-1) Secondary Winding, the positive pole of diode D2 is connected with the lower end of mutual inductor (4-1) Secondary Winding, be in series with resistance R 2 between the positive input of active operational amplifier (4-2) and the output terminal, the output terminal of active operational amplifier (4-2) also is connected with an end of capacitor C, the other end ground connection of capacitor C.
6. according to the described monitoring system of claim 5, it is characterized in that described mutual inductor (4-1) adopts miniature current mode voltage transformer (VT).
7. according to the described monitoring system of claim 1, it is characterized in that, the structure of described counting thunder module (5) comprising: an end of mutual inductor (5-1) is connected with the positive pole of diode D1 and the positive pole of diode D2 respectively, the negative pole of diode D1 is connected with capacitor C 1, the negative pole of diode D2 respectively with capacitor C 2, one end of resistance R 1 is connected with an end of resistance R 2, the other end of resistance R 2 is connected with the pin 3 of ACAC transducer (5-2) and the positive pole of diode D3 respectively, the negative pole of diode D3 is connected with the negative pole of diode D4, the positive pole of diode D4, the other end of resistance R 1, capacitor C 2, the other end of capacitor C 1 and mutual inductor (5-1) is connected with the pin 2 of ACAC transducer (5-2) respectively
The pin 1 of described ACAC transducer (5-2) respectively with capacitor C 3, the negative pole of voltage stabilizing diode VD1, one end of the negative pole of voltage stabilizing diode VD2 and resistance R 3 is connected, the other end of resistance R 3 is connected with the positive pole of the middle light emitting diode of photo-coupler (5-3) and the negative pole of diode D5 respectively, capacitor C 3, the positive pole of voltage stabilizing diode VD1, the positive pole of voltage stabilizing diode VD2, the positive pole of diode D5 is connected with the pin 4 of ACAC transducer (5-2) respectively with the negative pole of the middle light emitting diode of photo-coupler (5-3)
The base stage of phototriode connects 5V voltage in the described photo-coupler (5-3), the emitter of light emitting transistor difference ground connection and capacitor C 4 in the photo-coupler (5-3), capacitor C 4 is connected with resistance R 4, resistance R 4 connects the collector of phototriode in the photo-coupler (5-3), the collector of light emitting transistor also is connected with the pin 1 of phase-reversing tube (5-4) in the photo-coupler (5-3), the pin 2 of phase-reversing tube (5-4) respectively with capacitor C 5, the negative pole of diode D6, the positive pole of diode D7 is connected with the negative pole of voltage stabilizing diode VD3, the positive pole of capacitor C 5 and voltage stabilizing diode VD3 is received respectively, the positive pole of diode D6 meets DGND, and the negative pole of diode D7 connects 3.3V voltage.
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