CN100432686C - Circuit device of leakage current detector of lightning protector and its operating method - Google Patents

Abstract

The present invention relates to a lightning arrester leakage current circuit device and working method. Said circuit device has receiving equipment connected with ground terminal of tested lightning arrester set between high voltage phase conductors with earth, transmitting device hung on above-mentioned high voltage phase conductors and radio fitted with said receiving equipment, transmitting device transmitting high-frequency signal loaded with high voltage phase conductors voltage phase signal, receiving equipment receiving said signal through radio mode, and receiving connected lightning arrester leakage total current signal through cable mode, through relevant processing to obtain resistance current value in leakage total current signal, finally displaying said current value to user.

Description

The circuit arrangement of the leakage current detector of lightning arrester and method of work thereof

Technical field

The present invention relates to a kind of circuit arrangement and method of work thereof of leakage current detector.

Background technology

The perfect lightning protection device of one cover should be installed on the high-tension line of electric system; wherein; before the high-tension line of electric system is delivered to the user and is provided transformer for oneself; should a lightning arrester be installed between each the root phase line of hi-line and ground, lightning arrester also can be arranged on the highway section through the minefield of high-tension line.The extensive lightning arrester of carrying out of China is MOA (english abbreviation of metal oxide arrester) at present, normally plays a role for guaranteeing MOA, needs regularly to detect the MOA state.

Under the situation of normal operation, the MOA operational factor can be reduced to non-linear resistance constant electric capacity in parallel, so comprise current in resistance property I by the leakage total current I of MOA _RWith capacity current I _CCurrent in resistance property I by MOA _RGenerally be about tens of microamperes, and capacity current I _CCan reach more than the hundreds of microampere; So under normal operation, current in resistance property I _ROnly account for and leak 5% to 20% of total current I.When the MOA deterioration or when making moist, leaking total current I will increase, at this moment, and current in resistance property I _RReflect the sensitiveest.When current in resistance property from I _RIncrease to I _R1 o'clock, leak total current I and also will increase to I1, capacity current I _CAlso will increase to I _C1, but current in resistance property I _RRecruitment much larger than capacity current I _CRecruitment.So when detecting the MOA running status, have only to passing through the current in resistance property I among the leakage total current I of MOA _RDetect the running status that to judge MOA more exactly.As current in resistance property I _RWhen being worth, illustrate that the running status of MOA is normal less than certain; Otherwise then undesired, need change MOA immediately.

Chinese patent application 00221986.7 discloses a kind of leakage current of an arrester on-Line Monitor Device, the device of this application is handled the leakage current in the lightning arrester by current rectifying and wave filtering circuit, then deliver to electric current/freq converting circuit and convert light frequency output to, be transported to signal by optical fiber at last and receive and processing circuit processes.But the device of this application only is that the leakage total current that lightning arrester leaks is monitored, not to by lightning arrester being the current in resistance property I among the leakage total current I of MOA _RDetect.So the device of this application can't fundamentally solve the accuracy of detection problem.

Chinese patent application 02290331.3 discloses a kind of 6～10kV Zinc-Oxide Arrester on-line measuring device.It is whole that device of this application and lightning arrester are concatenated into a job, the current in resistance property that lightning arrester is leaked in the total current detects, when current in resistance property meets or exceeds the threshold values that sets, the device of this application can be indicated with flash of light and the mode of falling board, makes an inspection tour the running status of personal identification lightning arrester with prompting.But this pick-up unit can not show the concrete numerical value that leaks circuital current in resistance property, does not also exist automatic record to leak the possibility of the current in resistance property value in the full current signal.

Summary of the invention

The purpose of this invention is to provide a kind of safe and reliable, with low cost, circuit arrangement and method of work thereof of measuring accurately, can directly showing the leakage current detector of the concrete numerical value that leaks the current in resistance property in the total current and lightning arrester easy to use.

Total design of the present invention is: adopt dispensing device and detect current in resistance property size in the leakage total current of lightning arrester with the wireless receiving trap that cooperates of described dispensing device; In use, dispensing device is mainly finished the collection to the voltage phase signal of survey high pressure phase line, and the phase place of this signal is identical with the phase place of current in resistance property in leaking total current, the voltage phase signal of the high pressure phase line of gathering is carried on the high-frequency pulse signal through modulation, sends the high-frequency signal of this voltage phase signal that is loaded with the high pressure phase line to receiving trap by wireless mode then on ground; Receiving trap receives described high-frequency pulse signal and carries out demodulation, obtains the voltage phase signal of the synchronous high pressure phase line of current in resistance property in described and the leakage total current, gathers simultaneously and leaks circuital phase signal and size of current thereof; Thereby can obtain the phase differential between the voltage-phase that leaks total current phase place and high pressure phase line, this phase differential just leaks the phase differential between total current phase place and its current in resistance property phase place, and then gives the user according to value and indication that corresponding formula obtains arrester resistance current.The user judges the duty of institute's survey lightning arrester and carries out the preparation that continues use or change in advance according to the size of current in resistance property, promptly when current in resistance property is worth near certain, then enter the preparatory stage of replacing, the lightning arrester of then being surveyed when being equal to or greater than certain value must be changed, otherwise, then can continue normal use.

Realize that the technical scheme that a kind of circuit arrangement is provided in the object of the invention is, the circuit arrangement of the leakage current detector of lightning arrester of the present invention, have when using the receiving trap that links to each other with the earth terminal that is arranged on the lightning arrester to be measured between a high pressure phase line and the ground, be hung on when also having use on the above-mentioned high pressure phase line and with the wireless dispensing device that cooperates of described receiving trap; During use, dispensing device can receive the voltage signal of described high pressure phase line, send the high-frequency signal of the voltage phase signal that is loaded with described high pressure phase line with the form of wireless transmission then; Receiving trap can receive the high-frequency signal of this voltage phase signal that is loaded with phase line and the leakage full current signal that receives coupled lightning arrester by wired mode by wireless mode, and calculate the current in resistance property value of leaking in the full current signal by corresponding formula, at last described current in resistance property value outwards is shown to the user.

In the technical scheme of foregoing circuit device, dispensing device has transmitting antenna, amplitude limit and filtering circuit and phase-modulation circuit; Receive the voltage signal of described high pressure phase line when transmitting antenna is to use and send the antenna of the high-frequency signal of the voltage phase signal that is loaded with the high pressure phase line with the form of wireless transmission; The voltage signal that when amplitude limit and filtering circuit are to use transmitting antenna is received is coupled, carries out amplitude limit, the voltage signal behind the amplitude limit is carried out the circuit that filtering obtains the voltage phase signal of high pressure phase line with voltage regulation way again by way of electromagnetic induction; When phase-modulation circuit is to use the voltage phase signal of the high pressure phase line of amplitude limit and filtering circuit output is carried out the circuit of high frequency modulated; The voltage signal output end of transmitting antenna connects the voltage signal input end of amplitude limit and filtering circuit, the voltage phase signal input end of the voltage phase signal output termination phase-modulation circuit of amplitude limit and filtering circuit, the voltage-phase modulation signal output terminal of phase-modulation circuit receives and sends the voltage-phase modulation signal input end of antenna.Dispensing device also can have frequency adjustable square wave generation circuit and driving and sound and light signal generation circuit; Dispensing device is provided with power switch, can be to the amplitude limit of frequency adjustable square wave generation circuit and dispensing device and must electricly controlling simultaneously with dead electricity of filtering circuit, phase-modulation circuit and driving and sound and light signal generation circuit when this power switch uses; The frequency signal output termination amplitude limit of frequency adjustable square-wave generator and the voltage signal input end of filtering circuit, the voltage phase signal output terminal of amplitude limit and filtering circuit also links to each other with the signal input part of driving and sound and light signal generation circuit.

In the technical scheme of foregoing circuit device, receiving trap has current in resistance property testing circuit, antenna reception and demodulator circuit and display circuit; The current in resistance property testing circuit has the full current signal of leakage input end, voltage-phase square-wave signal input end and shows signal output terminal; The port that the leakage full current signal input end of current in resistance property testing circuit receiving trap when using links to each other with the earth terminal of lightning arrester and can receive the leakage full current signal of lightning arrester in use; The voltage-phase square-wave signal input end of the voltage phase signal output termination current in resistance property testing circuit of antenna reception and demodulator circuit, the shows signal input end of the shows signal output termination display circuit of current in resistance property testing circuit.

The current in resistance property testing circuit of above-mentioned receiving trap can have ASIC special IC, amplification and analog to digital conversion circuit, single-chip microcomputer and shaping circuit; The ASIC special IC has current phase square-wave signal input end, voltage-phase square-wave signal input end and phase data output terminal; Single-chip microcomputer has the total current of leakage digital signal input end, phase signal input end and shows signal output terminal; The signal input part of amplification and analog to digital conversion circuit and shaping circuit is the leakage full current signal input end of current in resistance property testing circuit; The voltage-phase square-wave signal input end of ASIC special IC is the voltage-phase square-wave signal input end of current in resistance property testing circuit; The shows signal output terminal of single-chip microcomputer is the shows signal output terminal of current in resistance property testing circuit; The signal output part of shaping circuit connects the current phase square-wave signal input end of ASIC special IC; The phase data output terminal of ASIC special IC connects the phase signal input end of single-chip microcomputer; The signal output part of amplification and analog to digital conversion circuit connects the leakage total current digital signal input end of single-chip microcomputer.Receiving trap also can have the phase shifter that is arranged between antenna reception and demodulator circuit and the ASIC special IC, the signal input part of the voltage phase signal output termination phase shifter of antenna reception just and demodulator circuit, the signal output part of phase shifter connects the voltage-phase square-wave signal input end of ASIC special IC, thus antenna is received and the voltage phase signal output terminal of demodulator circuit by phase shifter and link to each other with the voltage-phase square-wave signal input end of ASIC special IC.

The current in resistance property testing circuit of above-mentioned receiving trap also can have amplification and analog to digital conversion circuit, flush bonding processor and shaping circuit; Flush bonding processor has the total current of leakage digital signal input end, current phase square-wave signal input end, voltage-phase square-wave signal input end and shows signal output terminal; The input end of amplification and analog to digital conversion circuit and shaping circuit is the leakage full current signal input end of current in resistance property testing circuit; The voltage-phase square-wave signal input end of flush bonding processor is the voltage-phase square-wave signal input end of current in resistance property testing circuit; The shows signal output terminal of flush bonding processor is the shows signal output terminal of current in resistance property testing circuit; The signal output part of shaping circuit connects the current phase square-wave signal input end of flush bonding processor, the leakage total current digital signal input end of the output termination flush bonding processor of amplification and analog to digital conversion circuit.Receiving trap also can have the phase shifter that is arranged between antenna reception and demodulator circuit and the flush bonding processor, the signal input part of the voltage phase signal output termination phase shifter of antenna reception just and demodulator circuit, the signal output part of phase shifter connects the voltage-phase square-wave signal input end of flush bonding processor, thus antenna is received and the voltage phase signal output terminal of demodulator circuit by phase shifter and link to each other with the voltage-phase square-wave signal input end of flush bonding processor.

Current in resistance property testing circuit for receiving trap has the ASIC special IC, amplify and analog to digital conversion circuit, the circuit arrangement of the leakage current detector of the lightning arrester of single-chip microcomputer and shaping circuit, its method of work is, for the lightning arrester that is arranged between a high pressure phase line and the ground, the leakage total current input end of the current in resistance property testing circuit of receiving trap is linked to each other with the earth terminal of this lightning arrester, dispensing device is hung on the above-mentioned high pressure phase line, and directly contacts with this high pressure phase line by its transmitting antenna, or transmitting antenna is vertical with this high pressure phase line but directly do not contact; Also have following steps:

1. the current in resistance property testing circuit of receiving trap receives the leakage full current signal of being exported by the earth terminal of lightning arrester simultaneously by the signal input part of its shaping circuit and the signal input part of amplification and analog to digital conversion circuit; Amplification and analog to digital conversion circuit are handled back output to this leakage full current signal and are leaked the total current digital signal to single-chip microcomputer; Shaping circuit is converted to the current phase square-wave signal after to this leakage full current signal shaping, transports to the current phase square-wave signal input end of ASIC special IC then; Antenna receive and demodulator circuit with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device carry out formation voltage phase place square-wave signal after the demodulation, described voltage-phase square-wave signal is transported to the voltage-phase square-wave signal input end of ASIC special IC after the phase shifter phase shift;

2. the voltage-phase square-wave signal of ASIC special IC after to above-mentioned phase shift carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f to described frequency then _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360\mathrm{<figure-callout\; id="1"\; label="N\; N"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">N</figure-callout>}}{N};$ Then described phase difference value φ is sent into the phase data input end of single-chip microcomputer;

3. after single-chip microcomputer receives the phase data of described representative phase difference value φ, these phase difference value data are got cosine and obtain the value of cos φ; Single-chip microcomputer leaks the leakage total current digital signal of total current digital signal input end reception from amplification and analog to digital conversion circuit by it, draws after single-chip microcomputer is handled this digital signal and leaks circuital value I;

4. single-chip microcomputer is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of single-chip microcomputer is exported described current in resistance property value I then _RThe numerical value shows signal to the shows signal input end of display circuit, display circuit shows current in resistance property value I _RValue.

The circuit arrangement of leakage current detector that has the lightning arrester of amplification and analog to digital conversion circuit, flush bonding processor and shaping circuit for the current in resistance property testing circuit of receiving trap, its method of work is, for the lightning arrester that is arranged between a high pressure phase line and the ground, the leakage total current input end of the current in resistance property testing circuit of receiving trap is linked to each other with the earth terminal of this lightning arrester, dispensing device is hung on the above-mentioned high pressure phase line, and by its transmitting antenna directly contact with this high pressure phase line or transmitting antenna vertical with this high pressure phase line but directly do not contact; Also have following steps:

1. the current in resistance property testing circuit of receiving trap is received the leakage full current signal of the earth terminal of lightning arrester simultaneously by the signal input part of the signal input part of its shaping circuit and amplification and analog to digital conversion circuit; Amplification and analog to digital conversion circuit are handled back output to this leakage full current signal and are leaked the total current digital signal to flush bonding processor; Shaping circuit is converted to the current phase square-wave signal after to this leakage full current signal shaping, transports to the current phase square-wave signal input end of flush bonding processor then; Antenna receive and demodulator circuit with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device carry out generating after the demodulation voltage-phase square-wave signal of high pressure phase line; This voltage-phase square-wave signal is transported to the voltage-phase square-wave signal input end of flush bonding processor after the phase shifter phase shift;

2. the voltage-phase square-wave signal of flush bonding processor after to above-mentioned phase shift carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f to described frequency afterwards _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360\mathrm{<figure-callout\; id="1"\; label="N\; N"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">N</figure-callout>}}{N},$ Again the data of this phase difference value φ are got cosine and obtain the value of cos φ;

3. in the voltage-phase square-wave signal and described current phase square-wave signal of flush bonding processor after receiving described phase shift, leak the leakage total current digital signal of total current digital signal input end reception by its total current, draw after flush bonding processor is handled this digital signal and leak circuital value I from amplification and analog to digital conversion circuit;

4. flush bonding processor is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of flush bonding processor is exported described current in resistance property value I afterwards _RThe numerical value shows signal to the shows signal input end of display circuit, display circuit shows current in resistance property value I _RValue.

The good effect that the present invention has: the wireless working method of employing detects the duty of same lightning arrester between (1) dispensing device of the present invention and the receiving trap, and is easy to detect, accurate, safe and reliable.(2) transmitting antenna of dispensing device of the present invention directly is mounted on the phase line of high-tension line to be measured, or be mounted on the high pressure phase line to be measured and make antenna vertical with high pressure phase line to be measured and directly do not contact by the insulation suspension member that is arranged on antenna end, thereby make transmitting antenna the voltage signal in the survey high pressure phase line can be responded to, the high-frequency signal of handling the back will be loaded with this high pressure phase line with wireless voltage phase signal through internal circuit is sent on the ground receiving trap through transmitting antenna, and is safe in utilization.(3) after dispensing device of the present invention and receiving trap are set up frequency adjustable square wave generation circuit, before detection, can realize the function self check, during use, frequency adjustable square wave generation circuit produces the power frequency square-wave signal, if receiving trap can normally show, this illustrates that whole device is working properly, does not illustrate that then circuit arrangement is undesired if there is demonstration, need keep in repair.After dispensing device of the present invention is on this basis further set up driving and sound and light signal generation circuit, then on the one hand when self check, if receiving trap can not normally show, but the sound and light signal generation circuit of dispensing device sends sound and light signal, filtering and amplitude limiter circuit that dispensing device then is described are working properly, problem goes out on the phase-modulation circuit or receiving trap of dispensing device, has simplified the judgement of trouble location; When normal the use,, illustrate that then the phase line of the high-tension line of being surveyed is in power failure state on the other hand if the sound and light signal generation circuit of dispensing device is reactionless.After the present invention is provided with frequency adjustable square wave generation circuit and driving and sound and light signal generation circuit, improved the reliability and the ease for use of circuit arrangement of the present invention.(4) circuit arrangement of the present invention is when operate as normal, the circuital current in resistance property value of leakage that can show lightning arrester at display circuit, the current in resistance property value that the user shows according to display circuit is judged the state of institute's survey lightning arrester, and carry out the preparation that continues use or change in advance, this provides strong assurance for using lightning arrester safely and reliably.(5) the current in resistance property testing circuit in the receiving trap of the present invention is handled the circuital signal of leakage of the lightning arrester gathered on the one hand and is obtained the signal of its phase signal and size of current thereof, also the voltage phase signal of the identical high pressure phase line of the current in resistance property phase place with in leaking total current imported is handled on the other hand, can obtain leaking phase differential between the voltage-phase of circuital phase place and high pressure phase line by further processing like this, just obtain leaking the phase differential between circuital phase place and its current in resistance property phase place, and then by formula to this phase differential with leak the total current size and calculate, and obtain current in resistance property value in the leakage total current of lightning arrester.In order accurately to measure described phase difference value, the core component of current in resistance property testing circuit can adopt flush bonding processor (flush bonding processor comprises digital signal processor DSP and U.S. ARM---Advanced RISCMachines---arm processor of company), flush bonding processor can provide higher survey frequency, and it is powerful, has characteristics simple in structure, that speed is fast, reliable and stable.The core component of certain current in resistance property testing circuit also can adopt the ASIC special IC, and (ASIC is the english abbreviation of special IC, it comprises on-site programmable gate array FPGA and programmable logic device (CPLD)) and the combined pattern of single-chip microcomputer, thereby escapable cost; But because the survey frequency that single-chip microcomputer provided will be lower than above-mentioned flush bonding processor and ASIC special IC, thereby measuring accuracy is lower, in order to remedy this shortcoming, can be in above-mentioned ASIC special IC the single square wave of resulting phase signal be carried out step-by-step counting with high-frequency signal, thereby can accurately calculate phase difference value φ, then this phase difference value φ is delivered to single-chip microcomputer and carry out corresponding subsequent processing and obtain accurate current in resistance property value, thereby improve measuring accuracy.Certainly also can adopt high-frequency signal that the single square wave of resulting phase signal is carried out step-by-step counting for the receiving trap of the present invention that adopts flush bonding processor, thereby can accurately calculate phase difference value φ, continue then this phase difference value φ is carried out corresponding subsequent processing and obtains accurate current in resistance property value.(6) after receiving trap of the present invention adopts phase shifter, solved the adverse effect of bringing to accuracy of detection at the phase effects of coupling between that detects between each on-the-spot bar high pressure phase line.Certainly also can when obtaining phase difference value, revise for the phase effects of coupling between between the high pressure phase line by the mode of software processes.

Description of drawings

Fig. 1 is a kind of synoptic diagram of circuit arrangement of the leakage current detector of lightning arrester of the present invention.

Fig. 2 is circuit arrangement of the present invention a kind of synoptic diagram in use shown in Figure 1.

Fig. 3 is a kind of circuit block diagram of the dispensing device in the circuit arrangement of the present invention shown in Figure 2.

Fig. 4 is a kind of circuit block diagram of the receiving trap in the circuit arrangement of the present invention shown in Figure 2.

Fig. 5 is a kind of circuit block diagram of the receiving trap that obtains after the ingredient of the current in resistance property testing circuit among Fig. 4 is showed.

Fig. 6 is the another kind of circuit block diagram of the receiving trap that obtains after the ingredient of the current in resistance property testing circuit among Fig. 4 is showed.

Fig. 7 is the third circuit block diagram of the receiving trap that obtains after the ingredient of the current in resistance property testing circuit among Fig. 4 is showed.

Fig. 8 is the circuit theory diagrams of the phase-modulation circuit in the dispensing device shown in Figure 2.

Fig. 9 is the waveform synoptic diagram of the phase difference detection that receiving trap shown in Figure 4 adopted.

Figure 10 is the workflow block diagram of the ASIC special IC in the receiving trap shown in Figure 5.

Figure 11 is the flow chart of the single-chip microcomputer in the receiving trap shown in Figure 5.

Figure 12 is the flow chart that flush bonding processor adopted in the receiving trap shown in Figure 6.

Embodiment

(embodiment 1)

See Fig. 1, the circuit arrangement of the leakage current detector of the lightning arrester of present embodiment has dispensing device 1 and receiving trap 2.

See Fig. 3, dispensing device 1 has transmitting antenna 11, amplitude limit and filtering circuit 12, phase-modulation circuit 13, frequency adjustable square wave generation circuit 14 and driving and sound and light signal generation circuit 15.Receive the voltage signal of the high pressure phase line link to each other with lightning arrester to be measured when transmitting antenna 11 is to use and be loaded with the antenna of high-frequency signal of the voltage phase signal of described high pressure phase line with the form transmission of wireless transmission.The voltage signal of the high pressure phase line that when amplitude limit and filtering circuit 12 are to use transmitting antenna 11 is received is coupled, carries out amplitude limit, the voltage signal behind the amplitude limit is carried out the circuit that filtering obtains the voltage phase signal of phase line with voltage regulation way again by way of electromagnetic induction.When phase-modulation circuit 13 is to use the voltage phase signal of the phase line of amplitude limit and filtering circuit 12 outputs is carried out the circuit of high frequency modulated.Frequency adjustable square wave generation circuit 14 is used for producing the power frequency square-wave signal when self check, frequency adjustable square wave generation circuit 14 is provided with the power switch of band button, during use frequency adjustable square wave generation circuit 14 electric and dead electricity by the power switch control of this band button.Driving and sound and light signal generation circuit 15 send sound and light signal when the voltage phase signal of amplitude limit and filtering circuit 12 normal output phase lines.

Still see Fig. 3, the voltage signal output end of transmitting antenna 11 connects the voltage signal input end of amplitude limit and filtering circuit 12, and the voltage phase signal output terminal of amplitude limit and filtering circuit 12 connects the voltage phase signal input end of phase-modulation circuit 13 and the signal input part of driving and sound and light signal generation circuit 15 respectively; The voltage-phase modulation signal output terminal of phase-modulation circuit 13 receives and sends the voltage-phase modulation signal input end of antenna 11.The frequency signal output termination amplitude limit of frequency adjustable square-wave generator 14 and the voltage signal input end of filtering circuit 12.

See Fig. 8, phase-modulation circuit 13 adopts ASK (amplitude modulation(PAM)) modulation circuit, and the carrier frequency that it adopted is between 315MHz to 900MHz.The carrier frequency that the phase-modulation circuit 13 of the dispensing device 1 of present embodiment is adopted is 433.920MHz.Phase-modulation circuit 13 is crystal oscillator, capacitor C 1, C2, Cb by sound surface resonance device, resistance R 1, R2, R3, and inductance L 1 and triode are formed.C1 wherein, C2, L1 constitutes Collpitts oscillator, and its oscillation frequency f1 is that carrier frequency is:

$\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">f</figure-callout>}1=\frac{1}{2\mathrm{\&pi;}\sqrt{L1\frac{C1C2}{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">C</figure-callout>}1+C2}}}$

Still see Fig. 8, the voltage phase signal of the phase line of amplitude limit and filtering circuit 12 outputs is imported from the DATA end of phase-modulation circuit 13, when signal is high level, and oscillatory circuit work, OUT holds output signal; When signal was low level, circuit quit work.So just, realized the ASK modulation of signal, so that can carry out wireless transmission.

See Fig. 4 and Fig. 5, receiving trap 2 has antenna and receives and demodulator circuit 21, current in resistance property testing circuit 20, display circuit 25 and phase shifter 27.Antenna receives and demodulator circuit 21 when being to use with wireless receiving to the loading from dispensing device 1 survey the circuit of formation voltage phase place square-wave signal after the high-frequency signal demodulation of voltage phase signal of phase line to some extent.Current in resistance property testing circuit 20 has the full current signal of leakage input end, voltage-phase square-wave signal input end and shows signal output terminal; To leak full current signal and voltage-phase square-wave signal when current in resistance property testing circuit 20 is to use handles the back, obtains leaking the current in resistance property value signal in the full current signal and transports to the circuit of display circuit 25.Receive the shows signal of current in resistance property testing circuit 20 when display circuit 25 is to use, show the corresponding circuit that leaks the current in resistance property value in the full current signal then.Phase shifter 27 is to receive from antenna and thereby the voltage-phase square-wave signal of demodulator circuit 21 transplants and removes the circuit of the phase deviation that produces because of alternate coupling.

See Fig. 5, antenna receives and demodulator circuit 21 is become by antenna, inductive coil, LC tuned circuit and high frequency demodulation chipset, and the model of this high frequency demodulation chip is RX3400.The driving circuit that display circuit 25 has LCDs and is electrically connected with LCDs accordingly.Current in resistance property testing circuit 20 is made up of ASIC special IC 22, amplification and analog to digital conversion circuit 23, single-chip microcomputer 24 and shaping circuit 26.It is the on-site programmable gate array FPGA of EP1K50QC208-3 that ASIC special IC 22 adopts model.ASIC special IC 22 has current phase square-wave signal input end, voltage-phase square-wave signal input end and phase data output terminal; The voltage-phase square-wave signal input end of ASIC special IC 22 is the voltage-phase square-wave signal input end of current in resistance property testing circuit 20.When ASIC special IC 22 is to use anti-phase back of voltage-phase square-wave signal and current phase square-wave signal carried out obtaining the phase differential square-wave signal, the more single square wave of this phase differential square-wave signal and cycle being adopted the mode of high-frequency count to obtain two numerical value respectively, multiply by coefficient again after these two numerical value are divided by and obtain the circuit of phase data with logical operation.Amplification and analog to digital conversion circuit 23 will be transformed into the circuit that leaks the total current digital signal from the leakage full current signal of lightning arrester when being to use.The model of the single-chip microcomputer 24 of present embodiment is AT89C51.Single-chip microcomputer 24 has the total current of leakage digital signal input end, phase signal input end and shows signal output terminal; Single-chip microcomputer 24 is in use obtained the cosine value of phase data, and the cosine value that will leak total current digital signal and phase data afterwards multiplies each other and obtains leaking current in resistance property value signal in the full current signal, again this current in resistance property value signal is transported to display circuit 25.When being to use, shaping circuit 26 will be converted to the circuit of current phase square-wave signal from the leakage full current signal of lightning arrester.

Still see Fig. 5, the signal input part of amplification and analog to digital conversion circuit 23 and the signal input part of shaping circuit 26 are the leakage full current signal input end of current in resistance property testing circuit 20.The signal output part of shaping circuit 26 connects the current phase square-wave signal input end of ASIC special IC 22, and the phase data output terminal of ASIC special IC 22 connects single-chip microcomputer 24 phase signal input ends; The signal output part of amplification and analog to digital conversion circuit 23 connects the leakage total current digital signal input end of single-chip microcomputer 24; The shows signal output terminal of single-chip microcomputer 24 is as the shows signal input end of the shows signal output termination display circuit 25 of current in resistance property testing circuit 20.The signal input part of the voltage phase signal output termination phase shifter 27 of antenna reception and demodulator circuit 21, the signal output part of phase shifter 27 connects the voltage-phase square-wave signal input end of ASIC special IC 22.

See Fig. 1 to Fig. 4, receiving trap 2 also can be set up the supervisory keyboard that is connected on the single-chip microcomputer 24, be provided with the program segment of self-checking function in the single-chip microcomputer 24, by operation to supervisory keyboard, can demonstrate the selection of function on the LCDs of display circuit 25, the function of setting has two kinds of measuring ability and self-checking functions at least.In addition, first power switch is set receiving trap 2 and special frequency adjustable square wave generation circuit (does not draw among the figure, can become to be called the adjustable square wave generation of second frequency circuit), the output terminal of this second frequency is adjustable square wave generation circuit links to each other with the signal input part of amplification and analog to digital conversion circuit 23 and shaping circuit 26 simultaneously, generation power frequency square-wave signal during use.First power switch of receiving trap 2 can be controlled simultaneously to the dead electricity that gets of antenna reception and demodulator circuit 21, ASIC special IC 22, amplification and analog to digital conversion circuit 23, single-chip microcomputer 24, display circuit 25 and shaping circuit 26, and said frequencies is adjustable, and square wave generation circuit then is provided with special personal second source switch.

Therefore, the circuit arrangement of present embodiment can also carry out the function self check before use.During self check, press first power switch and second source switch of receiving trap 2 after, can make receiving trap 2 be in the self check duty by operating control keyboard again.The output of second frequency wherein is adjustable square wave generation circuit is divided into two-way, the road power frequency square-wave signal of being exported becomes the current value digital signal behind amplification and analog to digital conversion circuit 23, another road power frequency square-wave signal of being exported becomes the current phase square-wave signal after shaping circuit 26 is handled.

Press the power switch of dispensing device 1 again, 14 in frequency adjustable square wave generation circuit produces the power frequency square-wave signal, this signal divides two-way output after amplitude limit and filtering circuit 12 processing, one the tunnel transports to and drives and sound and light signal generation circuit 15 makes wherein acousto-optic element sounding and luminous, expression amplitude limit and filtering circuit 12 are working properly, another road forms the high-frequency signal that is loaded with from the voltage phase signal of power frequency component after phase-modulation circuit 13 carries out high frequency modulated, this signal is transported to transmitting antenna 11, and transmitting antenna 11 is to the high-frequency signal that this is loaded with voltage phase signal that sends of receiving trap 2.After the antenna reception of receiving trap 2 and demodulator circuit 21 receive this signal, will generate correspondent voltage phase place square-wave signal after its demodulation, this voltage-phase square-wave signal is transported to ASIC special IC 22 after phase shifter 27 phase shifts.

ASIC special IC 22 receives voltage-phase square-wave signal that phase shifter 27 transmits on the one hand and it is carried out anti-phase processing, receive on the other hand from shaping circuit 26 current phase square-wave signals, then anti-phase voltage-phase square-wave signal and current phase square-wave signal are carried out and logical conversion, obtaining the phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, is that to adopt frequency be f for the single square wave of expression phase difference value of the phase differential square-wave signal of f to described frequency then _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360\mathrm{<figure-callout\; id="1"\; label="N\; N"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">N</figure-callout>}}{N},$ To represent the phase data of phase difference value φ to send into the phase signal input end of single-chip microcomputer 24 then.

After single-chip microcomputer 24 receives and represents the phase data of phase difference value φ, this phase data is got cosine and obtained the value of cos φ; Single-chip microcomputer 24 leaks the current value digital signal of total current digital signal input end reception from amplification and analog to digital conversion circuit 23 by it, draws circuital value I after 24 pairs of these signals of single-chip microcomputer are handled.Single-chip microcomputer 24 is according to formula I then _R=I*cos φ calculates and divides current value I _RSize, the shows signal output terminal of single-chip microcomputer 24 is exported described electric current I then _RThe numerical value shows signal to the shows signal input end of display circuit 25, display circuit 25 shows electric current I _RValue, illustrate that so far self check is normal.If display circuit 25 can not show electric current I _RValue, the circuit arrangement cisco unity malfunction then is described.

See Fig. 2, the method of work of the circuit arrangement of the leakage current detector of lightning arrester of the present invention is as follows: for the normal circuit arrangement of the present invention of self check, can be used for the lightning arrester that respectively is connected the online use between a corresponding high pressure phase line and the ground is carried out the detection of leakage current one by one, thereby judge that those can continue normal use in institute's survey lightning arrester, those will be carried out to change and prepare, and those must be changed at once.Also be provided with the 3rd power switch in the dispensing device 1 of present embodiment, this power switch is can be under the induction of the electromagnetic field of high pressure phase line and the power switch of conducting.After this power switch conducts, then only the amplitude limit of dispensing device 1 and filtering circuit 12, phase-modulation circuit 13 and driving and sound and light signal generation circuit 15 are powered, and not to frequency adjustable square wave generation circuit 14 power supplies of dispensing device 1.

Still see Fig. 2, it is concrete when circuit arrangement of the present invention is installed, the power switch of dispensing device 1 wherein is set to be in off-state, hold insulating bar by the people transmitting antenna 11 of dispensing device 1 is articulated on the corresponding high pressure phase line that is connected with lightning arrester to be measured, and transmitting antenna 11 directly contacts with this high pressure phase line.This moment, the 3rd power switch conducts in the dispensing device 1 and made inner the dry cell of being with to amplitude limit and filtering circuit 12, phase-modulation circuit 13 and driving and sound and light signal generation circuit 15 is powered and dispensing device 1 is started working.At this moment, transmitting antenna 11 receives the voltage signal (frequency of this voltage signal is power frequency 50Hz in China) of high pressure phase line, the voltage signal of the high pressure phase line that 12 pairs of transmitting antennas 11 of amplitude limit and filtering circuit are received is coupled by the mode of electromagnetic induction, use the mode (being exactly that stabilivolt is set in circuit) of voltage stabilizing to carry out amplitude limit again, voltage signal behind the amplitude limit is carried out obtaining after the filtering voltage phase signal of high pressure phase line, divide two-way output then: the one road delivers to and drives and sound and light signal generation circuit 15 carries out acousto-optic and shows, allows the operator know the amplitude limit of dispensing device 1 and filtering circuit 12 operate as normal; Another road is delivered to phase-modulation circuit 13 and is carried out the ASK high frequency modulated, and sends by transmitting antenna 11.

Still see Fig. 2, when the receiving trap 2 of circuit arrangement of present embodiment specifically was installed, first power switch wherein was in conducting state, and the second source switch is in off-state.Receiving trap 2 is placed on the ground, and the current in resistance property testing circuit 20 of receiving trap 2 is linked to each other with the earth terminal of above-mentioned lightning arrester by the signal input part of its amplification and analog to digital conversion circuit 23 and shaping circuit 26 simultaneously.

See Figure 10 and Figure 11, the method for work of the circuit arrangement of the leakage current detector of the lightning arrester of present embodiment also has following steps:

1. the signal input part of the signal input part of shaping circuit 26 and amplification and analog to digital conversion circuit 23 receives the leakage full current signal (frequency of this leakage full current signal is power frequency 50Hz in China) by the earth terminal output of lightning arrester simultaneously.Amplification and 23 pairs of these leakage full current signal of analog to digital conversion circuit are handled back output leakage total current digital signal to single-chip microcomputer 24; Be converted to the current phase square-wave signal after 26 pairs of these leakage full current signal shapings of shaping circuit, transport to the current phase square-wave signal input end of ASIC special IC 22 then; Antenna receive and demodulator circuit 21 with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device 1 carry out formation voltage phase place square-wave signal after the demodulation, described voltage-phase square-wave signal is transported to the voltage-phase square-wave signal input end of ASIC special IC 22 after phase shifter 27 phase shifts.

2. the voltage-phase square-wave signal after 22 pairs of above-mentioned transposition of ASIC special IC carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f (power frequency 50Hz just) to described frequency then _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360\mathrm{<figure-callout\; id="1"\; label="N\; N"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">N</figure-callout>}}{N};$ Then described phase difference value φ is sent into the phase signal input end (Figure 10) of single-chip microcomputer 24.

3. after single-chip microcomputer 24 receives the phase data of described representative phase difference value φ, these phase difference value data are got cosine and obtained the value of cos φ; Single-chip microcomputer 24 leaks the leakage total current digital signal of total current digital signal input end reception from amplification and analog to digital conversion circuit 23 by it, draws after 24 pairs of these digital signals of single-chip microcomputer are handled and leaks circuital value I (Figure 11).

5. single-chip microcomputer 24 is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of single-chip microcomputer 24 is exported described current in resistance property value I then _RThe numerical value shows signal to the shows signal input end of display circuit 25, display circuit 25 shows current in resistance property value I _RValue (Figure 11).

F in the present embodiment _cValue be 40MHz.

(embodiment 2)

The remainder of present embodiment is identical with embodiment 1, and difference is that the ASIC special IC 22 in the receiving trap 2 is the complex programmable logic device (CPLD) of EP1K100 for model.

(embodiment 3)

See Fig. 6, the remainder of present embodiment is identical with embodiment 1, difference is, the current in resistance property testing circuit 20 of receiving trap 2 has amplification and analog to digital conversion circuit 23, flush bonding processor 29 and shaping circuit 26, flush bonding processor 29 has wherein replaced the ASIC special IC 22 among the embodiment 1 and the effect of single-chip microcomputer 24, flush bonding processor 29 in use carries out the anti-phase back of voltage-phase square-wave signal to obtain the phase differential square-wave signal with logical operation with the current phase square-wave signal, adopt the mode of high-frequency count to obtain two numerical value respectively to the single square wave and the cycle of this phase differential square-wave signal again, multiply by coefficient again after these two numerical value are divided by and obtain phase data, the cosine value of phase data is obtained, the cosine value that will leak total current digital signal and phase data afterwards multiplies each other and obtains leaking current in resistance property value signal in the full current signal again, again this current in resistance property value signal is transported to display circuit 25.Therefore, the function of flush bonding processor 29 is more powerful than ASIC special IC 22 among the embodiment 1 and single-chip microcomputer 24.Flush bonding processor 29 is the dsp chips that model is TMS320C2000.Flush bonding processor 29 has the total current of leakage digital signal input end, current phase square-wave signal input end, voltage-phase square-wave signal input end and shows signal output terminal.The leakage total current digital signal input end of flush bonding processor 29 is equivalent to the leakage total current digital signal input end of the single-chip microcomputer 24 among the embodiment 1, and this input end links to each other with the signal output part of amplification and analog to digital conversion circuit 23.The current phase square-wave signal input end of flush bonding processor 29 is equivalent to the current phase square-wave signal input end of the ASIC special IC 22 among the embodiment 1, and this input end links to each other with the signal output part of shaping circuit 26.The voltage-phase square-wave signal input end of flush bonding processor 29 is equivalent to the voltage-phase square-wave signal input end of the ASIC special IC 22 among the embodiment 1, and this input end links to each other with the signal output part of phase shifter 27.The shows signal output terminal of flush bonding processor 29 is equivalent to the shows signal output terminal of the single-chip microcomputer 24 among the embodiment 1, and this output terminal links to each other with the shows signal input end of display circuit 25.

See Fig. 9 and Figure 12, the method for work of the circuit arrangement of the leakage current detector of the lightning arrester of present embodiment also with embodiment 1 in method of work basic identical, the method for work of receiving trap 2 has following steps:

1. the current in resistance property testing circuit 20 of receiving trap 2 is received the leakage full current signal (frequency of this leakage full current signal is power frequency 50Hz in China) of the earth terminal of lightning arrester simultaneously by the signal input part of the signal input part of its shaping circuit 26 and amplification and analog to digital conversion circuit 23; Amplification and 23 pairs of these leakage full current signal of analog to digital conversion circuit are handled back output leakage total current digital signal to flush bonding processor 29; Be converted to the current phase square-wave signal after 26 pairs of these leakage full current signal shapings of shaping circuit, transport to the current phase square-wave signal input end of flush bonding processor 29 then; Antenna receive and demodulator circuit 21 with wireless receiving to this voltage-phase square-wave signal of voltage-phase square-wave signal that carries out generating after the demodulation high pressure phase line of the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device 1 after phase shifter 27 phase shifts, transport to the voltage-phase square-wave signal input end of flush bonding processor 29.

2. the voltage-phase square-wave signal after 29 pairs of above-mentioned phase shifts of flush bonding processor carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f (power frequency 50Hz just) to described frequency afterwards _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360\mathrm{<figure-callout\; id="1"\; label="N\; N"\; filenames="C20051008282600251.png"\; state="\{\{state\}\}">N</figure-callout>}}{N},$ Again the data of this phase difference value φ are got cosine and obtain the value of cos φ;

3. in the voltage-phase square-wave signal and described current phase square-wave signal of flush bonding processor 29 after receiving described phase shift, leak the leakage total current digital signal of total current digital signal input end reception by its total current, draw after 29 pairs of these digital signals of flush bonding processor are handled and leak circuital value I from amplification and analog to digital conversion circuit 23;

4. flush bonding processor 29 is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of flush bonding processor 29 is exported described current in resistance property value I afterwards _RThe numerical value shows signal to the shows signal input end of display circuit 25, display circuit 25 shows current in resistance property value I _RValue.

F in the present embodiment _cValue be 20MHz.

(embodiment 4)

The remainder of present embodiment is identical with embodiment 3, and difference is that flush bonding processor is the ARM chip that a model is ARM7TDMI.

(embodiment 5)

See Fig. 7, the remainder of the circuit structure of present embodiment is identical with embodiment 1, difference is, the part effect of the ASIC special IC 22 in the described current in resistance property testing circuit 20 is replaced by phase difference detecting circuit 28, and another part effect is replaced by single-chip microcomputer 24.

Phase difference detecting circuit 28 has ASIC special IC 22 corresponding current phase square-wave signal input ends, voltage-phase square-wave signal input end and the phase signal output terminal with embodiment 1, and phase signal output terminal wherein connects the phase signal input end of single-chip microcomputer 24; The voltage-phase square-wave signal input end of phase difference detecting circuit 28 is the voltage-phase square-wave signal input end of current in resistance property testing circuit 20; The signal output part of shaping circuit 26 connects the current phase square-wave signal input end of phase difference detecting circuit 28; The voltage-phase square-wave signal input end of phase difference detecting circuit 28 is current in resistance property testing circuit 20; The phase signal output terminal of phase difference detecting circuit 28 connects the phase signal input end of single-chip microcomputer 24.

When the phase difference detecting circuit 28 of present embodiment is to use anti-phase back of voltage-phase square-wave signal and current phase square-wave signal carried out obtaining the phase differential square-wave signal, again this phase differential square-wave signal being carried out that frequency division is handled and the circuit that obtains the phase differential square-wave signal behind the frequency division with logical operation; The single-chip microcomputer 24 of present embodiment then in use adopts the mode of high-frequency count to obtain two numerical value respectively, multiply by coefficient again after these two numerical value are divided by and obtain phase data the single square wave of the phase differential square-wave signal behind the frequency division and cycle, the cosine value of phase data is obtained, the cosine value that will leak total current digital signal and phase data afterwards multiplies each other and obtains leaking current in resistance property value signal in the full current signal, again this current in resistance property value signal is transported to display circuit 25 again.

Phase difference detecting circuit 28 is made up of phase inverter 281, AND circuit 282 and frequency divider 283.The input end of phase inverter 281 is the voltage-phase square-wave signal input end of phase difference detecting circuit 28; An input end of the output termination AND circuit 282 of phase inverter 281; Another input end of AND circuit 282 is the current phase square-wave signal input end of phase difference detecting circuit 28;

The input end of the output termination frequency divider 283 of AND circuit 282; The output terminal of frequency divider 283 is the phase signal output terminal of phase difference detecting circuit 28.

During the circuit arrangement works of present embodiment, receiving trap 2 wherein receive by its antenna on the one hand and demodulator circuit 21 with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device 1 carry out formation voltage phase place square-wave signal after the demodulation, described voltage-phase square-wave signal is transported to phase inverter 281 input ends of phase difference detecting circuit 28 after phase shifter 27 phase shifts, obtain anti-phase voltage-phase square-wave signal after the anti-phase processing of phase inverter, this anti-phase voltage-phase square-wave signal is transported to an input end of AND circuit 282; Receiving trap 2 receives the leakage full current signal of being exported by the earth terminal of lightning arrester simultaneously by the signal input part of its shaping circuit 26 and the signal input part of amplification and analog to digital conversion circuit 23 on the other hand; Amplification and 23 pairs of these leakage full current signal of analog to digital conversion circuit are handled back output leakage total current digital signal to single-chip microcomputer 24; Be converted to another input end that the current phase square-wave signal is transported to AND circuit 282 after 26 pairs of these leakage full current signal shapings of shaping circuit; 282 pairs of anti-phase voltage-phase square-wave signals of AND circuit and current phase square-wave signal carry out with logical process after, output frequency is that f (power frequency 50Hz just) phase differential square-wave signal is to frequency divider 283; Frequency divider 283 carries out the conversion of K frequency division with this phase differential square-wave signal, is the phase differential square-wave signal input end that the phase differential square-wave signal of f/K is sent into single-chip microcomputer 24 then with the frequency behind the described K frequency division, and present embodiment is the look-at-me input end of single-chip microcomputer 24.

It is f that the single square wave of the phase differential square-wave signal that 24 pairs of described frequencies from the look-at-me input end of single-chip microcomputer are f/K adopts frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f/K to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360N}{N1}$ , again the data of this phase difference value φ are got cosine and obtain the value of cos φ; Single-chip microcomputer 24 leaks the leakage total current digital signal of total current digital signal input end reception from amplification and analog to digital conversion circuit 23 by it, draws after 24 pairs of these leakage total current digital signals of single-chip microcomputer are handled and leaks circuital value I.Then, single-chip microcomputer 24 through type I _R=I*cos φ calculates current in resistance property value I _RSize, single-chip microcomputer 24 is exported described current in resistance property value I by its shows signal output terminal afterwards _RThe numerical value shows signal to the shows signal input end of display circuit 25, display circuit 25 shows current in resistance property value I _RValue.

The single-chip microcomputer of present embodiment can adopt MCS-51 series, and its model is AT89C52 (can adopt other Series chip in other embodiments).F in the present embodiment _cValue be 1MHz.

(embodiment 6 to 10)

Embodiment 6 is corresponding with embodiment 1, embodiment 7 is corresponding with embodiment 2, embodiment 8 is corresponding with embodiment 3, embodiment 9 is corresponding with embodiment 4, embodiment 10 is corresponding with embodiment 5, the remainder of embodiment 5 to embodiment 8 is identical with corresponding embodiment, and difference is: dispensing device 1 is provided with the insulation suspension member by the end that is arranged on transmitting antenna 11 and is articulated on the high pressure phase line of being surveyed, and described transmitting antenna 11 is vertical with high pressure phase line to be measured and directly do not contact with phase line.The distance of the end of transmitting antenna 11 and high pressure phase line to be measured is in the 50cm, and the distance that embodiment 6 to embodiment 10 is adopted is followed successively by 5,10,20,30,45cm.

Claims (9)

1, a kind of circuit arrangement of leakage current detector of lightning arrester, have when using the receiving trap (2) that links to each other with the earth terminal that is arranged on the lightning arrester to be measured between a high pressure phase line and the ground, be hung on when also having use on the above-mentioned high pressure phase line and with the wireless dispensing device that cooperates of described receiving trap (2) (1); During use, dispensing device (1) can receive the voltage signal of described high pressure phase line, send the high-frequency signal of the voltage phase signal that is loaded with described high pressure phase line with the form of wireless transmission then; Receiving trap (2) can receive the high-frequency signal of this voltage phase signal that is loaded with phase line and receive the leakage full current signal I of coupled lightning arrester by wired mode by wireless mode, and passes through formula I _R=I*cos φ calculates the current in resistance property I that leaks in the full current signal _RValue, φ wherein is the voltage of described high pressure phase line and leaks phase difference value between the total current, at last described current in resistance property value outwards is shown to the user; It is characterized in that: dispensing device (1) has transmitting antenna (11), amplitude limit and filtering circuit (12) and phase-modulation circuit (13); Transmitting antenna (11) receives the voltage signal of described high pressure phase line and sends the antenna of the high-frequency signal of the voltage phase signal that is loaded with the high pressure phase line with the form of wireless transmission when being to use; Amplitude limit and filtering circuit (12) are coupled, carry out amplitude limit, the voltage signal behind the amplitude limit is carried out the circuit that filtering obtains the voltage phase signal of high pressure phase line with voltage regulation way again by way of electromagnetic induction the voltage signal that transmitting antenna (11) receives when being to use; Phase-modulation circuit (13) carries out the circuit of high frequency modulated to the voltage phase signal of the high pressure phase line of amplitude limit and filtering circuit (12) output when being to use; The voltage signal output end of transmitting antenna (11) connects the voltage signal input end of amplitude limit and filtering circuit (12), the voltage phase signal input end of the voltage phase signal output termination phase-modulation circuit (13) of amplitude limit and filtering circuit (12), the voltage-phase modulation signal output terminal of phase-modulation circuit (13) receives and sends the voltage-phase modulation signal input end of antenna (11).

2, the circuit arrangement of the leakage current detector of lightning arrester according to claim 1 is characterized in that: dispensing device (1) also has frequency adjustable square wave generation circuit (14) and driving and sound and light signal generation circuit (15); Dispensing device (1) is provided with power switch, can be to the amplitude limit of frequency adjustable square wave generation circuit (14) and dispensing device (1) and must electricly controlling simultaneously with dead electricity of filtering circuit (12), phase-modulation circuit (13) and driving and sound and light signal generation circuit (15) when this power switch uses; The frequency signal output termination amplitude limit of frequency adjustable square-wave generator (14) and the voltage signal input end of filtering circuit (12), the voltage phase signal output terminal of amplitude limit and filtering circuit (12) also links to each other with the signal input part of driving and sound and light signal generation circuit (15).

3, the circuit arrangement of the leakage current detector of lightning arrester according to claim 1 is characterized in that: receiving trap (2) has current in resistance property testing circuit (20), antenna receives and demodulator circuit (21) and display circuit (25); Current in resistance property testing circuit (20) has the full current signal of leakage input end, voltage-phase square-wave signal input end and shows signal output terminal; The leakage full current signal input end of current in resistance property testing circuit (20) port that receiving trap (2) links to each other with the earth terminal of lightning arrester when using and can receive the leakage full current signal of lightning arrester in use; The voltage-phase square-wave signal input end of the voltage phase signal output termination current in resistance property testing circuit (20) of antenna reception and demodulator circuit (21), the shows signal input end of the shows signal output termination display circuit (25) of current in resistance property testing circuit (20).

4, the circuit arrangement of the leakage current detector of lightning arrester according to claim 3 is characterized in that: the current in resistance property testing circuit (20) of receiving trap (2) has ASIC special IC (22), amplification and analog to digital conversion circuit (23), single-chip microcomputer (24) and shaping circuit (26); ASIC special IC (22) has current phase square-wave signal input end, voltage-phase square-wave signal input end and phase data output terminal; Single-chip microcomputer (24) has the total current of leakage digital signal input end, phase signal input end and shows signal output terminal; Amplify and voltage-phase square-wave signal input end that the signal input part of analog to digital conversion circuit (23) and shaping circuit (26) is the leakage full current signal input end ASIC special IC (22) of current in resistance property testing circuit (20) is the voltage-phase square-wave signal input end of current in resistance property testing circuit (20); The shows signal output terminal of single-chip microcomputer (24) is the shows signal output terminal of current in resistance property testing circuit (20); The signal output part of shaping circuit (26) connects the current phase square-wave signal input end of ASIC special IC (22); The phase data output terminal of ASIC special IC (22) connects the phase signal input end of single-chip microcomputer (24); The signal output part of amplification and analog to digital conversion circuit (23) connects the leakage total current digital signal input end of single-chip microcomputer (24).

5, the circuit arrangement of the leakage current detector of lightning arrester according to claim 4, it is characterized in that: receiving trap (2) also has the phase shifter (27) that is arranged between antenna reception and demodulator circuit (21) and the ASIC special IC (22), the signal input part of the voltage phase signal output termination phase shifter (27) of antenna reception just and demodulator circuit (21), the signal output part of phase shifter (27) connects the voltage-phase square-wave signal input end of ASIC special IC (22), thus antenna is received and the voltage phase signal output terminal of demodulator circuit (21) by phase shifter (27) and link to each other with the voltage-phase square-wave signal input end of ASIC special IC (22).

6, the circuit arrangement of the leakage current detector of lightning arrester according to claim 3 is characterized in that: the current in resistance property testing circuit (20) of receiving trap (2) has amplification and analog to digital conversion circuit (23), flush bonding processor (29) and shaping circuit (26); Flush bonding processor (29) has the total current of leakage digital signal input end, current phase square-wave signal input end, voltage-phase square-wave signal input end and shows signal output terminal; The input end of amplification and analog to digital conversion circuit (23) and shaping circuit (26) is the leakage full current signal input end of current in resistance property testing circuit (20); The voltage-phase square-wave signal input end of flush bonding processor (29) is the voltage-phase square-wave signal input end of current in resistance property testing circuit (20); The shows signal output terminal of flush bonding processor (29) is the shows signal output terminal of current in resistance property testing circuit (20); The signal output part of shaping circuit (26) connects the current phase square-wave signal input end of flush bonding processor (29), the leakage total current digital signal input end of the output termination flush bonding processor (29) of amplification and analog to digital conversion circuit (23).

7, the circuit arrangement of the leakage current detector of lightning arrester according to claim 6, it is characterized in that: receiving trap (2) also has the phase shifter (27) that is arranged between antenna reception and demodulator circuit (21) and the flush bonding processor (29), the signal input part of the voltage phase signal output termination phase shifter (27) of antenna reception just and demodulator circuit (21), the signal output part of phase shifter (27) connects the voltage-phase square-wave signal input end of flush bonding processor (29), thus antenna is received and the voltage phase signal output terminal of demodulator circuit (21) by phase shifter (27) and link to each other with the voltage-phase square-wave signal input end of flush bonding processor (29).

8, a kind of method of work of circuit arrangement of the leakage current detector by the described lightning arrester of claim 5, for the lightning arrester that is arranged between a high pressure phase line and the ground, the leakage total current input end of the current in resistance property testing circuit (20) of receiving trap (2) is linked to each other with the earth terminal of this lightning arrester, dispensing device (1) is hung on the above-mentioned high pressure phase line, and by its transmitting antenna (11) directly contact with this high pressure phase line or transmitting antenna (11) vertical with this high pressure phase line but directly do not contact; Also have following steps:

1. the current in resistance property testing circuit (20) of receiving trap (2) receives the leakage full current signal of being exported by the earth terminal of lightning arrester simultaneously by the signal input part of its shaping circuit (26) and the signal input part of amplification and analog to digital conversion circuit (23); Amplification and analog to digital conversion circuit (23) are handled back output to this leakage full current signal and are leaked the total current digital signal to single-chip microcomputer (24); Shaping circuit (26) is converted to the current phase square-wave signal after to this leakage full current signal shaping, transports to the current phase square-wave signal input end of ASIC special IC (22) then; Antenna receive and demodulator circuit (21) with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device (1) carry out formation voltage phase place square-wave signal after the demodulation, described voltage-phase square-wave signal is transported to the voltage-phase square-wave signal input end of ASIC special IC (22) after phase shifter (27) phase shift;

2. the voltage-phase square-wave signal of ASIC special IC (22) after to above-mentioned phase shift carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f to described frequency then _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360N}{N1};$ Then described phase difference value φ is sent into the phase data input end of single-chip microcomputer (24);

3. after single-chip microcomputer (24) receives the phase data of described representative phase difference value φ, these phase difference value data are got cosine and obtained the value of cos φ; Single-chip microcomputer (24) leaks the leakage total current digital signal of total current digital signal input end reception from amplification and analog to digital conversion circuit (23) by it, draws after single-chip microcomputer (24) is handled this digital signal and leaks circuital value I;

4. single-chip microcomputer (24) is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of single-chip microcomputer (24) is exported described current in resistance property value I then _RThe numerical value shows signal to the shows signal input end of display circuit (25), display circuit (25) shows current in resistance property value I _RValue.

9, a kind of method of work of circuit arrangement of the leakage current detector by the described lightning arrester of claim 7, for the lightning arrester that is arranged between a high pressure phase line and the ground, the leakage total current input end of the current in resistance property testing circuit (20) of receiving trap (2) is linked to each other with the earth terminal of this lightning arrester, dispensing device (1) is hung on the above-mentioned high pressure phase line, and by its transmitting antenna directly contact with this high pressure phase line or transmitting antenna vertical with this high pressure phase line but directly do not contact; Also have following steps:

1. the current in resistance property testing circuit (20) of receiving trap (2) is received the leakage full current signal of the earth terminal of lightning arrester simultaneously by the signal input part of the signal input part of its shaping circuit (26) and amplification and analog to digital conversion circuit (23); Amplification and analog to digital conversion circuit (23) are handled back output to this leakage full current signal and are leaked the total current digital signal to flush bonding processor (29); Shaping circuit (26) is converted to the current phase square-wave signal after to this leakage full current signal shaping, transports to the current phase square-wave signal input end of flush bonding processor (29) then; Antenna receive and demodulator circuit (21) with wireless receiving to the high-frequency signal from the voltage phase signal that is loaded with the high pressure phase line of dispensing device (1) carry out generating after the demodulation voltage-phase square-wave signal of high pressure phase line; This voltage-phase square-wave signal is transported to the voltage-phase square-wave signal input end of flush bonding processor (29) after phase shifter (27) phase shift;

2. the voltage-phase square-wave signal of flush bonding processor (29) after to above-mentioned phase shift carries out anti-phase conversion and obtains the inversion signal of voltage-phase square-wave signal, again this inversion signal and above-mentioned current phase square-wave signal are carried out and logical conversion, and obtain phase differential square-wave signal between voltage-phase square-wave signal and the current phase square-wave signal, be that to adopt frequency be f for the single square wave of the phase differential square-wave signal of f to described frequency afterwards _cHigh-frequency signal carry out high-frequency count and obtain count value N, be that cycle of the phase differential square-wave signal of f to adopt frequency be f also to this frequency _cHigh-frequency signal carry out high-frequency count and obtain count value N1, calculate phase difference value afterwards: $\mathrm{\&phi;}=\frac{360N}{N1},$ Again the data of this phase difference value φ are got cosine and obtain the value of cos φ;

3. in the voltage-phase square-wave signal and described current phase square-wave signal of flush bonding processor (29) after receiving described phase shift, leak the leakage total current digital signal of total current digital signal input end reception by its total current, draw after flush bonding processor (29) is handled this digital signal and leak circuital value I from amplification and analog to digital conversion circuit (23);

4. flush bonding processor (29) is according to formula I _R=I*cos φ calculates current in resistance property value I _RSize, the shows signal output terminal of flush bonding processor (29) is exported described current in resistance property value I afterwards _RThe numerical value shows signal to the shows signal input end of display circuit (25), display circuit (25) shows current in resistance property value I _RValue.

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