CN101216523A - Substation grounding net defect diagnostic method and apparatus - Google Patents

Substation grounding net defect diagnostic method and apparatus Download PDF

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CN101216523A
CN101216523A CNA2007101856851A CN200710185685A CN101216523A CN 101216523 A CN101216523 A CN 101216523A CN A2007101856851 A CNA2007101856851 A CN A2007101856851A CN 200710185685 A CN200710185685 A CN 200710185685A CN 101216523 A CN101216523 A CN 101216523A
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signal
resistance
input
operational amplifier
output terminal
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CN101216523B (en
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刘洋
崔翔
赵志斌
李琳
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华北电力大学
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Abstract

A grounding grid defect diagnosis method of a transformer substation belongs to the field of electric power technology for solving the problems in grounding grid defect diagnosis. The technical proposal of the method comprises the following steps of: firstly, connecting different-frequency sine wave excitation sources between two lower conductors of the grounding grid of a transformer substation, directly injecting excitation current, simultaneously converting a magnetic induction intensity signal excited by the injected current on the ground into an induced voltage signal by a detection coil, measuring the distribution of the magnetic induction intensity on the ground and simulating the ground magnetic induction intensity of the grounding grid under normal condition; then comparing the measurement result with the simulation result and diagnosing the specific position and the degree of corrosive thinning or rupture defects of the grounding grid. The invention has convenient operation and can rapidly and accurately diagnose conductor defect in the grounding grid under the normal operation condition of the transformer substation to meet the requirement of actual field measurement and diagnosis.

Description

Substation grounding net defect diagnostic method and device

Technical field

The present invention relates to a kind of can be under the situation of the normal operation of transformer station, efficient, easy, diagnose the method for substation grounding net defect exactly, belong to the power technology field.

Background technology

Grounded screen plays crucial effect in that substation safety is in service; it not only provides a public reference ground for various electrical equipments in the transformer station; when the system failure and lightning protection, can also drain fault current rapidly and reduce earth potential liter in the transformer station, the safety of staff's personal safety and various electrical equipments and normally moving in the protection transformer station.Earthing device is generally latticed grounding body, usually utilize band steel, round steel, angle steel, steel pipe or copper material etc. to be welded to form grid, this grid usually is embedded in underground 0.6~1 meter degree of depth, so that the effect that realization is all pressed, loose and flow and reduce stake resistance, as shown in Figure 9.There is earth conductor to link to each other at different grid position places as required with the electrical equipment on ground.When transformer station is short-circuited or fault such as be struck by lightning; the big electric current of moment is dispensed into ground through grounded screen; stake resistance is more little; the potential rise of grounded screen is just low more; the current potential of the current potential on the face of land and the electrical equipment that links to each other with grounded screen is just low like this, thus staff's personal safety in protection electrical equipment and the transformer station.But the grounded screen of steel material in rainy and coastland, along with the increase of tenure of use, is easily corroded, and earth conductor is attenuated even ruptures, and has destroyed the original structure of grounded screen, has reduced the ground connection performance, has lost defencive function.

In recent years, the breakpoint and the heavy corrosion section of searching grounded screen become great anti-accident measures of power department.Sampling excavated inspection after the common method of power department diagnosis ground net corrosion or fracture defective was crossed certain time limit exactly, according to the general configuration and the rate of corrosion of transformer station's place's soil, estimated the extent of corrosion of grounded screen grid conductor by rule of thumb.This method has blindness, and workload is big, needs to consume great amount of manpower and material resources and financial resources, also is subjected to the restriction of on-the-spot service condition simultaneously, is difficult to diagnose accurately grounding net defect.

In addition, some comparatively advanced diagnostic methods have also appearred at present, be based on circuit and network theory analysis more, depend on the measurement that can touch resistance between guide body, promptly utilize the measurement data of resistance between the topological structure of grounded screen and ground lead, set up the corrosion diagnostic equation of grounded screen, obtain the changing value of grounded screen branch road conductor by finding the solution diagnostic equation, utilize the situation of analysis software and normal grounded screen to compare, and then judge the extent of corrosion of grounded screen.Yet when heavy corrosion or breakpoint appearred in the part, because the mutual resistance effect between two parts grounded screen, accurately resistance value was very difficult between measuring lead wire, and this method is used for that engineering is actual to have certain limitation.The diagnostic method that adopts electromagnetic field is also arranged, carry out the fault diagnosis of grounded screen by the potential difference (PD) of measuring the grounded screen face of land, but for this netted grounded screen structure of transformer station, when grounded screen conductor local corrosion or when little fracture occurring, surface potential changes less, in actual engineering, also be difficult by etch state and the searching breakpoint of measuring surface potential difference analysis grounding net of transformer substation conductor.

Summary of the invention

The present invention be used to overcome prior art defective, provide a kind of diagnosis efficiency height, easy and simple to handle, measure substation grounding net defect diagnostic method accurately, the present invention gives the device of this method of realization simultaneously.

The alleged problem of the present invention realizes with following technical proposals:

A kind of substation grounding net defect diagnostic method the steps include: the at first sine-wave excitation source of access alien frequencies between twice guide body of grounding net of transformer substation, directly injects exciting current; Utilize detecting coil to be induced voltage signal simultaneously, measure the distribution of magnetic induction density on the face of land because of the magnetic induction density signal transition that injection current excites on the face of land; Face of land magnetic induction density under the simulation calculation grounded screen normal condition distributes, and then measurement result and simulation calculation result is compared, and according to both difference, diagnoses out ground net corrosion to attenuate or the particular location and the degree of the defective that ruptures.

Above-mentioned substation grounding net defect diagnostic method, in order to avoid interference such as power frequency, harmonic wave, improve signal to noise ratio (S/N ratio) and measuring accuracy, should frequency adjustment circuit be set in driving source inside, in view of directly injecting and the extraction electric current to grounded screen, in order to realize impedance matching, impedance transformer is set at the output terminal of driving source.

Above-mentioned substation grounding net defect diagnostic method, in order to suppress on-the-spot electromagnetic interference (EMI) effectively, to the face of land magnetic induction density signal of measuring gained after power frequency trap, filtering, phase sensitive detection are handled, with power frequency and other interference rejection.

A kind of substation grounding net defect diagnostic device, partly form by detectable signal generation part and acquisition of signal, described detectable signal generating unit is divided into driving source 5, driving source adopts sine-wave generator, its signal output part is connected between twice guide body of earth mat, described acquisition of signal partly comprises detecting coil L, signal processing circuit and acquisition analysis system C, the signal output part of described detecting coil L connects the input end of signal processing circuit, the input end of the output termination acquisition analysis system C of signal processing circuit.

Above-mentioned substation grounding net defect diagnostic device, described signal processing circuit is made up of instrument amplifier YF, power frequency notch filter XB, bandpass filter LB and phase-sensitive detector (PSD) XMJ, the input termination detecting coil L of described instrument amplifier YF, output terminal meets acquisition analysis system C through power frequency notch filter XB, bandpass filter LB and phase-sensitive detector (PSD) XMJ successively; The clock signal input terminal f of bandpass filter LB CLKConnect clock signal generator, the reference signal input end S of phase-sensitive detector (PSD) XMJ connects the reference output terminal of driving source.

Above-mentioned substation grounding net defect diagnostic device, described power frequency notch filter XB is made up of two operational amplifiers, resistance, electric capacity and potentiometer W, two operational amplifiers are respectively the first operational amplifier F1 and the second operational amplifier F2, all are connected into voltage follower; Resistance, electric capacity is connected into wave invigorating network, wherein, first resistance R 1, after being connected in series, second resistance R 2 is connected between the positive input of the input end of instrument amplifier YF and the first operational amplifier F1, their serial connection o'clock connects the output terminal of the second operational amplifier F2 through the 3rd capacitor C 3, first capacitor C 1, after being connected in series, second capacitor C 2 also is connected between the positive input of the input end of instrument amplifier YF and the first operational amplifier F1, their serial connection o'clock connects the output terminal of the second operational amplifier F2 through the 3rd resistance R 3, the output signal of the first operational amplifier F1 connects the positive input of the second operational amplifier F2 after potentiometer W dividing potential drop, the signal input part of the output terminal tape splicing bandpass filter LB of the first operational amplifier F1.

Above-mentioned substation grounding net defect diagnostic device, described bandpass filter LB adopts LTC1068/50, and LTC1068/50 is connected into 8 rank wave filters, and its signal input part INVA meets the output terminal of power frequency notch filter XB, clock signal input terminal f CLKConnect the output terminal of clock-signal generator, the output signal of its LPD and HPD/HD end connects the input end of phase-sensitive detector (PSD) XMJ.

Above-mentioned substation grounding net defect diagnostic device, described phase-sensitive detector (PSD) XMJ is by three operational amplifiers, two field effect transistor, resistance, diode and electric capacity are formed, three operational amplifiers are respectively the 3rd operational amplifier F3, four-operational amplifier F4 and the 5th operational amplifier F5, all be connected into inverting amplifier, wherein, the 3rd operational amplifier F3 and the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 is connected into first inverting amplifier, four-operational amplifier F4 and the tenth resistance 10, the 11 resistance 11, the 12 resistance 12 is connected into second inverting amplifier, the 5th operational amplifier F5 and the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15 is connected into the 3rd inverting amplifier, two field effect transistor are respectively the first field effect transistor JFET1 and the second field effect transistor JFET2, the input end of first inverting amplifier is through the output terminal of the 4th capacitor C 4 tape splicing bandpass filter LB, its output termination acquisition analysis system C, the output terminal of the input end tape splicing bandpass filter LB of second inverting amplifier, output terminal is successively through the 5th capacitor C 5, the 16 resistance R 16 and the first field effect transistor JFET1 connect the reverse input end of the 3rd operational amplifier F3, the reference signal output terminal of the input termination driving source 5 of the 3rd inverting amplifier, output terminal connects the grid of the first field effect transistor JFET1 through the first diode D1, the second field effect transistor JFET2 is connected between the first field effect transistor JFET1 and the power cathode, and its grid connects the reverse input end of the 5th operational amplifier F5 through the second diode D2.

The present invention utilizes the sine-wave excitation source of alien frequencies, directly inject exciting current to earth mat, utilize detecting coil L to measure the magnetic induction density distribution that injection current excites on the face of land, face of land magnetic induction density under the simulation calculation grounded screen normal condition distributes simultaneously, then measurement result and simulation calculation result is compared.According to both difference, the diagnosis ground net corrosion attenuates or the particular location and the degree of the defective that ruptures.Impedance transformer is used to solve the resistance matching problem between driving source and the grounded screen load, improves signal to noise ratio (S/N ratio); Adopt the sine-wave excitation source of alien frequencies can avoid interference such as power frequency, harmonic wave, improve measuring accuracy.Signal processing circuit is made up of instrument amplifier, power frequency notch filter, bandpass filter and phase-sensitive detector (PSD), has suppressed on-the-spot electromagnetic interference (EMI) effectively.The present invention is easy and simple to handle, can quickly and accurately ground network defect be diagnosed under the situation of the normal operation of transformer station, can satisfy the measurement and diagnosis requirement of actual field.

Description of drawings

The invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is the driving source connection diagram;

Fig. 2 is a measuring method synoptic diagram of the present invention;

Fig. 3 is diagnosis driving source system principle structural representation;

Fig. 4 is the electrical schematic diagram of signal processing circuit;

Fig. 5 is the electrical schematic diagram of power frequency notch filter;

Fig. 6 is the electrical schematic diagram of bandpass filter;

Fig. 7 is the electrical schematic diagram of phase-sensitive detector (PSD);

Fig. 8 is the diagnostic routine FB(flow block);

Fig. 9 is a certain 220kV power transformation station owner grounded screen vertical view;

The local magnetic induction density of grounded screen face of land distribution plan before Figure 10 embodiment fault;

Figure 11 is the local magnetic induction density of a grounded screen face of land distribution plan after the embodiment fault.

Each label is among the figure: 1, earth mat, 2, concentric cable, 3, signal processing circuit and analytic system, 4, ground, 5, driving source, YF, instrument amplifier, XB, power frequency notch filter, LB, bandpass filter, XMJ, phase-sensitive detector (PSD), C, acquisition analysis system, F1, F2, F3, F4, F5 operational amplifier, L, detecting coil, IC1, bandpass filter integrated circuit, C1~C5, electric capacity, R1~R16, resistance, D1, D2, diode, JFET1, JFET2, field effect transistor.

Embodiment

The present invention is directed to the deficiency of prior art, a kind of method and system of substation grounding net defect diagnosis has been proposed, can under normal operation of transformer station and situation about not excavating, to the grounded screen injection current, measure its magnetic induction density that excites on face of land distribution carrying out defect diagonsis by directly.It is a whole set of diagnostic measurement system that constitutes with driving source, magnetic flux density measurement device, computing machine and simulation analysis program three.Both can be used for grounding net of transformer substation extent of corrosion, breakpoint diagnosis, and also can be used for newly designing grounded screen and check and accept detection.Its method is easy, diagnosis efficiency is high, engineering practicability is strong.

The present invention has following characteristics:

1) exciting current by twice guide body of grounding net of transformer substation, is directly injected in the sine-wave excitation source of employing alien frequencies;

2) based on electromagnetic induction principle and phase sensitive detection technology, utilize detecting coil to change the magnetic induction density that grounded screen grid conductor excites on the face of land into induced voltage signal, under transformer station's complex electromagnetic environment, signal is carried out filtering, phase sensitive detection and extraction handle, and then obtain surveying the magnetic induction density distribution that injection current excites on the face of land;

3) based on electromagnetic theories such as finite element method and Biot's Safa Er Dinglv, the face of land magnetic induction density under the simulation calculation grounded screen normal condition distributes; Measurement result and simulation calculation result are compared, according to the feature that face of land magnetic induction density distributes, the defective of conductor corrosion of diagnosis grounded screen grid or fracture.

The present invention adopts the sine-wave excitation source of alien frequencies, by twice guide body of grounding net of transformer substation, directly injects exciting current.Concrete operations are as follows: based on linear amplification and ultracrystallite magnetic core impedance conversion technology, in the frequency band of broad and under the situation of big output current, realize the continuous adjusting of frequency and output current, solve the resistance matching problem between power amplifier and the grounded screen load; Select the injection and the size of extracting position and injection current out of exciting current according to the field condition of tested grounded screen, directly inject exciting current to grounded screen.

Under transformer station's complex electromagnetic environment, phase sensitive detection technology and the logical adjustable bandpass filter of centre frequency of band are adopted in the measurement of face of land magnetic induction density.By with the fit adjustment of exciting signal frequency, can suppress on-the-spot electromagnetic interference (EMI) effectively, avoid mainly disturbing frequency, make measuring accuracy and resolution can satisfy the defect diagonsis requirement.

Measurement and data processing comprise computing machine and corresponding program, behind the structural parameters and in-site measurement data of input grounding net of transformer substation, this program is shown in illustraton of model, simulation calculation result's (adopting common grounded screen performance evaluation routine package CDEGS), the measurement result of grounded screen on the computer screen, by comparing and measuring and result of calculation, can demonstrate particular location and the defect level of grounding net defect (corrosion attenuates or ruptures).If face of land magnetic induction density generation significant change or fall above certain section conductor illustrates this section conductor seriously corroded or breakpoint occurred.

Measurement mechanism of the present invention also comprises the sine-wave excitation origin system of alien frequencies, in grounded screen detection and diagnosis engineering, all need a pumping signal, present driving source, for easy to carry, adopt storage battery power supply more, output current is little, frequency range is narrow, carrying load ability is poor, the workplace that can only be used for little electric currents such as measured soil resistivity, impedance ground, and can not satisfy needs such as surface potential, the Distribution of Magnetic Field engineering detecting of exciting current greatly.The present invention needs driving source to have bigger electric current fan-out capability in order to improve signal to noise ratio (S/N ratio) and measuring accuracy.Consider complex electromagnetic environments in the transformer station, require the frequency of pumping signal adjustable within the specific limits,, avoid interference such as power frequency, harmonic wave so that select suitable frequency.According to situations such as backflow lead-in wires between the big or small of grounded screen area and injection of consideration electric current and the extraction point, require driving source can adapt to different loads.

Fig. 3 for diagnosis with driving source system principle structural drawing because signal frequency is stronger with interior frequency range intrinsic inductance at 2kHz to the influence of grounded screen Conductor Impedance and soil leakage current, be about 200~250nT, and a few KHz descends comparatively fast when above.It is big more to inject exciting current, and face of land magnetic induction density is strong more, signal to noise ratio (S/N ratio) height during measurement, and easy more detection, but simultaneously driving source is had higher requirement, can not infinitely increase exciting current.In order to realize effective detection to face of land magnetic induction density, should select suitable exciting current according to the size of actual grounded screen and the sensitivity of magnetic field sensing system, general frequency is got 100~1kHz, and the electric current of output 2~50A can satisfy the test needs.Because the common loading range of linear amplifier is 4~16 Ω, and the load that grounded screen detects only is several ohm of zero points, and therefore, linear amplifier can not directly drive such load.The present invention is at driving source output terminal adjunction ferrite transformer formula impedance transformer (the double current transformer of doing), and the method by secondary coil tap, change no-load voltage ratio promotes output current or voltage, to obtain required pumping signal.

Referring to Fig. 5, adopt twin-T network to constitute the 50Hz trap circuit, can adjust the Q value of circuit by W.

Referring to Fig. 6, time clock f CLKBe used for the logical centre frequency of control and accommodation zone, R5, R6 are the output repeating resistance.

Because of the electromagnetic environment of transformer station is very complicated, power frequency is disturbed can reach tens little spies (μ T), the electromagnetic interference (EMI) that also exists harmonic wave, disconnecting link switch and line current variation etc. to cause simultaneously.In order effectively to detect the Distribution of Magnetic Field on the face of land, at first utilize detecting coil that face of land magnetic induction density signal transition is induced voltage signal, adopt the instrument amplifier as buffer stage, be used to suppress common mode interference and impedance conversion, the power frequency trap circuit suppresses the 50Hz strong jamming, after signal is carried out technical finesses such as power frequency trap, filtering, phase sensitive detection, utilize data acquisition system (DAS) to deposit measurement result in computing machine.The power frequency trap circuit should reach 50dB to the notch depth of 50Hz, and bandwidth-limited circuit is at the about 3dB of ± 10Hz place decay, decays to 25dB at ± 45Hz place, decays and reaches 50dB at ± 90Hz place, pass through trap and Filtering Processing after, must be able to suppress the power frequency interference.The pass band width of bandpass filter is narrower, and centre frequency can regulate continuously, and its centre frequency can be regulated in 200~900Hz scope.Actual electromagnetic background according to measure field is provided with the suitable exciting signal frequency and the centre frequency of receiving system, just can effectively extract useful signal.Its ultimate principle is:

If face of land directions X magnetic induction density component is

B x=B xmsin(2πf ct) (1)

B in the formula XmBe directions X magnetic induction density amplitude, f cBe the frequency of pumping signal, i.e. the centre frequency of bandpass filter.Suppose that the detecting coil plane is vertical with directions X, then the detecting coil total magnetic flux is

ψ=NB xS=NSB xm?sin(2πf ct) (2)

In the formula, S is the cross-sectional area of coil, and N is a coil turn.According to Faraday's electromagnetic induction law, the induction electromotive force size that produces on the coil is

v i = dψ dt = 2 π f c NSB xm cos ( 2 πf c t ) - - - ( 3 )

If this signal is A through amplification, filtered full gain, then the signal of exporting after the filtering is

v o=2πf cNSAB xmcos(2πf ct) (4)

Make k=2 π f cNSA, then

V om=kB xm (5)

V in the formula OmAmplitude for terminal output voltage signal.During diagnosis, just can be converted into the measurement of voltage signal to the measurement of face of land magnetic induction density according to (5) formula.

Adopt the inventive method and diagnostic system to carry out on-the-spot test at simulation earth mat and a plurality of 220kV transformer station, its diagnostic result is very consistent with actual conditions, and error can fast and effeciently be diagnosed the fracture defective of grounded screen grid conductor in 5%.

An application example of the present invention is:

Show the distribution situation that face of land magnetic induction density after the defective appears in grounded screen.For flawless grounded screen, can find face of land magnetic induction density component B from Fig. 9 xDistribution present certain rules, except electric current injects and a near B who extracts out the point xBeyond big, along the B on the every conductor face of land of directions X xIt is more even relatively to distribute, and is undulating movement along the Y direction, in case corrosion or breakpoint take place the local conductor of grounded screen, certainly will change this distribution characteristics, and this just provides reference for diagnosis.In actual measurement, can select injection and the extraction point of suitable last guide body position in conjunction with the physical location of guide body on the grounded screen as exciting current.Figure 10 shows when certain section conductor breakpoint or corrosion occur and tapers to a certain degree, this conductor ground table section magnetic induction density changes very obvious, according to the difference degree of magnetic induction density and adjacent domain, just can determine the defect level and the position of grounded screen grid conductor.

The present invention is except being applied to defect diagonsises such as grounding net of transformer substation corrosion, can also be widely used in earth works such as generating plant, building, communications tower and be completed the back, guarantee construction quality and the blindness that reduces daily servicing leaking effective detection means of weldering and rosin joint.

Among Fig. 4, the model of instrument amplifier is AD620.

Claims (8)

1. a substation grounding net defect diagnostic method is characterized in that, at first inserts the sine-wave excitation source of alien frequencies between twice guide body of grounding net of transformer substation, directly injects exciting current; Utilize detecting coil to be induced voltage signal simultaneously, measure the distribution of magnetic induction density on the face of land because of the magnetic induction density signal transition that injection current excites on the face of land; Face of land magnetic induction density under the simulation calculation grounded screen normal condition distributes, and then measurement result and simulation calculation result is compared, and according to both difference, diagnoses out ground net corrosion to attenuate or the particular location of the defective that ruptures.
2. according to the described substation grounding net defect diagnostic method of claim 1, it is characterized in that, frequency adjustment circuit is set, impedance transformer is set at the output terminal of driving source in driving source inside.
3. according to claim 1 or 2 described substation grounding net defect diagnostic methods, it is characterized in that, to the face of land magnetic induction density signal of measuring gained after power frequency trap, filtering, phase sensitive detection are handled, with power frequency and other interference rejection.
4. substation grounding net defect diagnostic device, it is characterized in that it by detectable signal part takes place and acquisition of signal is partly formed, described detectable signal generating unit is divided into driving source (5), driving source adopts sine-wave generator, and its signal output part is connected between twice guide body of earth mat; Described acquisition of signal partly comprises detecting coil (L), signal processing circuit and acquisition analysis system (C), the signal output part of described detecting coil (L) connects the input end of signal processing circuit, the input end of the output termination acquisition analysis system of signal processing circuit.
5. according to the described substation grounding net defect diagnostic device of claim 4, it is characterized in that, described signal processing circuit is made up of instrument amplifier (YF), power frequency notch filter (XB), bandpass filter (LB) and phase-sensitive detector (PSD) (SXF), the input termination detecting coil (L) of described instrument amplifier (YF), output terminal connects acquisition analysis system (C) through power frequency notch filter (XB), bandpass filter (LB), phase-sensitive detector (PSD) (XMJ) successively, the clock signal input terminal f of bandpass filter (LB) CLKConnect the output terminal of clock signal generator, the reference signal input end S of phase-sensitive detector (PSD) (XMJ) connects driving source reference signal output terminal.
6. according to the described substation grounding net defect diagnostic device of claim 5, it is characterized in that, described power frequency notch filter (XB) is made up of two operational amplifiers, resistance, electric capacity and potentiometers (W), two operational amplifiers are respectively first operational amplifier (F1) and second operational amplifier (F2), all are connected into voltage follower; Resistance, electric capacity are connected into wave invigorating network, wherein, be connected to after first resistance (R1), second resistance (R2) are connected in series between the positive input of the input end of instrument amplifier (YF) and first operational amplifier (F1), their serial connection o'clock connects the output terminal of second operational amplifier (F2) through the 3rd electric capacity (C3); Also be connected to after first electric capacity (C1), second electric capacity (C2) are connected in series between the positive input of the input end of instrument amplifier (YF) and first operational amplifier (F1), their serial connection o'clock connects the output terminal of second operational amplifier (F2) through the 3rd resistance (R3); The output signal of first operational amplifier (F1) connects the positive input of second operational amplifier (F2), the signal input part of the output terminal tape splicing bandpass filter (LB) of first operational amplifier (F1) after potentiometer (W) dividing potential drop.
7. according to the described substation grounding net defect diagnostic device of claim 5, it is characterized in that, described bandpass filter (LB) adopts LTC1068/SO, LTC1068/SO is connected into 8 rank wave filters, its signal input part INVA connects the output terminal of power frequency notch filter, and the output signal of its LPD and HPD/HD end connects the input end of phase-sensitive detector (PSD) (XMJ).
8. according to the described substation grounding net defect diagnostic device of claim 5, it is characterized in that, described phase-sensitive detector (PSD) (XMJ) is by three operational amplifiers, two field effect transistor, resistance, diode and electric capacity are formed, three operational amplifiers are respectively the 3rd operational amplifier (F3), four-operational amplifier (F4) and the 5th operational amplifier (F5), all be connected into inverting amplifier, wherein, the 3rd operational amplifier (F3) and the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9) is connected into first inverting amplifier, four-operational amplifier (F4) and the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12) is connected into second inverting amplifier, the 5th operational amplifier (F5) and the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15) is connected into the 3rd inverting amplifier, two field effect transistor are respectively first field effect transistor (JFET1) and second field effect transistor (JFET2), the input end of first inverting amplifier is through the output terminal of the 4th electric capacity (C4) tape splicing bandpass filter (LB), it exports termination acquisition analysis system (C), the output terminal of the input end tape splicing bandpass filter (LB) of second inverting amplifier, output terminal is successively through the 5th electric capacity (C5), the 16 resistance (R16) and first field effect transistor (JFET1) connect the reverse input end of the 3rd operational amplifier (F3), the reference signal output terminal of the input termination driving source (5) of the 3rd inverting amplifier, output terminal connects the canopy utmost point of first field effect transistor (JFET1) through first diode (D1), second field effect transistor (JFET2) is connected between first field effect transistor (JFET1) and the power cathode, and its grid connects the reverse input end of the 5th operational amplifier (F5) through second diode (D2).
CN2007101856851A 2007-12-28 2007-12-28 Substation grounding net defect diagnostic method and apparatus CN101216523B (en)

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