CN210181151U - Detection equipment for grounding grid defect diagnosis - Google Patents
Detection equipment for grounding grid defect diagnosis Download PDFInfo
- Publication number
- CN210181151U CN210181151U CN201920302547.5U CN201920302547U CN210181151U CN 210181151 U CN210181151 U CN 210181151U CN 201920302547 U CN201920302547 U CN 201920302547U CN 210181151 U CN210181151 U CN 210181151U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- coil
- detection
- stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a detection equipment for ground net defect diagnosis, including excitation source system and signal detection system, the excitation source system includes power supply, function signal generator, power amplifier circuit, impedance converter, current frequency display element and fault detector, power supply links to each other with function signal generator, power amplifier circuit and current frequency display element respectively, function signal generator, power amplifier circuit, impedance converter connect gradually, the impedance converter still is connected with current frequency display element, fault detector and ground net load respectively, the fault detector is including the signal receiver, signal amplifier, wave filter, analog-to-digital converter, alarm module and the display module that connect gradually. The utility model discloses convenient to use, the usage is extensive, can satisfy transmission line grounding grid ground connection performance detection and failure diagnosis's multiple needs.
Description
Technical Field
The utility model relates to a ground net detects technical field, particularly, relates to a detection equipment for ground net defect diagnosis.
Background
The grounding performance of the grounding grid in power transmission is directly related to the normal operation of a power transmission line, the grounding grid in China is mostly made of steel, and with the increase of service life and raininess and coastal areas, the grounding grid is easy to corrode or break conductors, so that the grounding performance of the grounding grid is influenced. The grounding device is generally a latticed grounding body, a grid is formed by welding flat steel, round steel, angle steel, steel pipes or copper materials and the like, the grid is usually buried in the ground to a depth of 0.6-1 m, so that the effects of pressure equalization, current dispersion and grounding resistance reduction are realized, and grounding conductors are connected with electrical equipment on the ground at different grid positions according to requirements. When the power transmission line has faults such as short circuit or lightning stroke, instantaneous large current is dispersed into the ground through the grounding grid, the smaller the grounding resistance is, the lower the potential of the grounding grid is raised, so that the potential of the ground surface and the potential of the electrical equipment connected with the grounding grid are lowered, and the personal safety of the electrical equipment and workers in the power transmission line is protected. However, in rainy and coastal areas, the grounding grid made of steel materials is easy to corrode along with the increase of service life, so that the grounding conductor is possibly thinned and even broken, the original structure of the grounding grid is damaged, the grounding performance is reduced, and the protection function is lost.
In recent years, finding the break point and the severe corrosion section of the grounding grid has become a great anti-accident measure for the power department. The common method for diagnosing the corrosion or fracture defects of the grounding grid by the power department is to sample, dig and inspect after a certain period of time, and estimate the corrosion degree of the grid conductor of the grounding grid by experience according to the approximate structure and corrosion rate of soil at the power transmission line. The method has the advantages of blindness, large workload, large consumption of manpower, material resources and financial resources, and difficulty in accurately diagnosing the defects of the grounding grid due to the restriction of field operation conditions.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a transmission line that diagnosis is efficient, easy and simple to handle, measurement accuracy is used for the diagnostic detection equipment of grounding grid defect.
The utility model adopts the technical proposal that: the utility model provides a detection equipment for ground net defect diagnosis, includes excitation source system and signal detection system, the excitation source system includes power supply, function signal generator, power amplifier circuit, impedance converter, current frequency display element and fault detector, power supply respectively with function signal generator, power amplifier circuit and current frequency display element link to each other, function signal generator, power amplifier circuit, impedance converter connect gradually, impedance converter still respectively with current frequency display element, fault detector and ground net load are connected, the fault detector is including signal receiver, signal amplifier, wave filter, analog-to-digital converter, alarm module and the display module who connects gradually.
In the detecting apparatus for ground net defect diagnosis described in the present invention, the function signal generator includes a control adjusting circuit, a signal generating circuit and an amplifying output stage, the power amplifying circuit includes an input stage, a push stage, an output stage and a protection stage, the protection stage respectively with the push stage and the output stage are connected, the impedance transformer includes a primary coil, a secondary coil and an iron core, the iron core is made of an annular nanocrystalline material, the primary coil is wound on the iron core with the secondary coil.
A detection equipment for ground net defect diagnosis in, signal detection system includes detection coil, signal processing circuit and collection analytic system, detection coil's signal output termination signal processing circuit's input, signal processing circuit's output termination collection analytic system's input.
A detection equipment for ground net defect diagnosis in, detection coil includes the detection coil frame of integral structure, sets up respectively detection coil shielding plate and detection coil wave guide of detection coil frame width both sides.
A detection equipment for ground net defect diagnosis in, control regulating circuit includes sinusoidal signal control regulating circuit and pulse signal control regulating circuit, signal generation circuit includes sinusoidal signal generation circuit and pulse signal generation circuit, it includes sinusoidal signal amplification output stage and pulse signal amplification output stage to amplify the output stage.
In the detecting apparatus for ground net defect diagnosis described in the present invention, the primary coil is connected to the power amplifying circuit, the secondary coil is provided with N taps for connecting with the ground net load, the N taps correspond to different primary and secondary coil transformation ratios, wherein N is an integer greater than or equal to 1.
In the detection apparatus for ground net defect diagnosis of the present invention, the winding wire diameter of the primary coil is 2.0mm, and the number of turns is 160; the secondary coil is provided with four taps, the winding wire diameter of the secondary coil is 3.7mm at the first tap, 2.0mm at the second tap, and 1.4mm at the third tap and the fourth tap, and the number of turns of the four taps is 80.
In the detection apparatus for ground net defect diagnosis described in the present invention, the thickness of the iron core is 75mm, the inner diameter is 180mm, and the outer diameter is 260 mm.
The embodiment of the utility model provides an excitation source system is through the improvement and the design of impedance converter to current linear power amplifier, in the broad frequency band, under the condition of guaranteeing enough current output capacity, the problem of power amplifier and ground net load matching has been solved, can adapt to different loads, frequency and continuous adjustable of electric current have been realized, possess two kinds of working methods of sine wave and duty ratio adjustable pulse signal, can be according to the measurement needs, through the selection of impedance converter transformation ratio, obtain higher output voltage or excitation current signal, the frequency and the electric current of output signal have the charactron to show in good time simultaneously, high durability and convenient use, and wide use, can satisfy the multiple needs of transmission line ground net ground connection performance detection and fault diagnosis; the system can detect current change more directly and more actively through the fault detector, and can give an alarm in time when the current value converted by the analog-to-digital converter is different from the normal current, so that the defects of the grounding grid can be found in time conveniently; the signal detection system is based on an electromagnetic induction principle and a phase-locked amplification technology, the magnetic induction intensity excited by a grounding grid conductor on the ground surface is converted into an induced voltage signal by using a detection coil, the signal is filtered, amplified and extracted in a phase-locked manner under a complex electromagnetic environment of a power transmission line, the magnetic induction intensity distribution excited by the injection current on the ground surface is further obtained, the electromagnetic interference on the site can be effectively inhibited through the matching with the excitation signal frequency, the main interference frequency point is set aside, and the measurement precision and the resolution can meet the defect diagnosis requirement.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic diagram of a wire structure according to an embodiment of the present invention;
fig. 2 is an equivalent circuit diagram of an impedance transformer and a load according to an embodiment of the present invention;
FIG. 3 is a geometric parameter diagram of an impedance transformer core according to an embodiment of the present invention;
fig. 4 is an electrical schematic diagram of an impedance converter in an embodiment of the invention;
fig. 5 is an electrical schematic diagram of a signal detection system in an embodiment of the invention;
fig. 6 is a schematic diagram of a frame line structure of a fault detector in an embodiment of the present invention.
Fig. 7 is an electrical schematic diagram of a fault detector in an embodiment of the invention
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the embodiment of the present invention provides a detection device for ground grid defect diagnosis, which is based on a phase-locked amplification technique and a band-pass filter with adjustable band-pass center frequency, and is adjusted by matching with an excitation signal frequency, so as to effectively suppress on-site electromagnetic interference, avoid main interference frequency points, and enable measurement accuracy and resolution to meet the defect diagnosis requirement; injecting different-frequency sine wave exciting current into the grounding grid, detecting the distribution of the magnetic induction intensity of the earth surface, diagnosing the state of the conductor of the grounding grid according to the distribution characteristics, and if the magnetic induction intensity of the earth surface above a certain section of conductor is obviously changed or falls, indicating that the section of conductor is seriously corroded or has a breakpoint. The device comprises an excitation source system and a signal detection system, wherein the excitation source system comprises a power supply 1, a function signal generator 2, a power amplification circuit 3, an impedance converter 4 and a current frequency display unit 5; the power supply source 1 is respectively connected with the function signal generator 2, the power amplification circuit 3 and the current frequency display unit 5, the function signal generator 2, the power amplification circuit 3 and the impedance converter 4 are sequentially connected, the impedance converter 4 is also respectively connected with the current frequency display unit 5, the fault detector 6 and the grounding grid load, and the fault detector 6 comprises a signal receiver 61, a signal amplifier 62, a filter 63, an analog-to-digital converter 64, an alarm module 65 and a display module 66 which are sequentially connected. Specifically, the function signal generator 2 includes a control and adjustment circuit 21, a signal generation circuit 22, and an amplification output stage 23, the control and adjustment circuit 21 includes a sinusoidal signal control and adjustment circuit 21 and a pulse signal control and adjustment circuit 21, the signal generation circuit 22 includes a sinusoidal signal generation circuit 22 and a pulse signal generation circuit 22, and the amplification output stage 23 includes a sinusoidal signal amplification output stage 23 and a pulse signal amplification output stage 23. The sine signal control and adjustment circuit 21 is used for adjusting the signal frequency of a worker and sending an adjustment instruction to the sine signal generation circuit 22; the sine signal generating circuit 22 generates an initial sine signal of a corresponding frequency based on the frequency command; the sine signal amplification output stage 23 is configured to amplify the initial sine signal to obtain the sine signal. It can be seen that the sine signal control and adjustment circuit 21, the sine signal generation circuit 22 and the sine signal amplification output stage 23 are used for generating sine wave signals and performing signal frequency adjustment; when signal frequency adjustment is performed, it should be noted that the sinusoidal waveform cannot be distorted. Similarly, the pulse signal control and adjustment circuit 21 is used for adjusting the pulse width of the signal for the staff, and sends an adjustment instruction to the pulse signal generation circuit 22; the pulse signal generating circuit 22 generates an initial pulse signal of a corresponding pulse width based on the pulse width instruction; the pulse signal amplification output stage 23 is configured to perform amplification processing on the initial pulse signal to obtain the pulse signal. It can be seen that the pulse signal control and adjustment circuit 21, the pulse signal generation circuit 22 and the pulse signal amplification output stage 23 are used for generating pulse signals and performing signal pulse width adjustment. The power amplifying circuit 3 comprises an input stage 31, a push stage 32, an output stage 33 and a protection stage 34, the protection stage 34 being connected to the push stage 32 and the output stage 33, respectively. The power amplification circuit 3 is mainly used for power amplification of signals and outputting a drive current. In the embodiment, when the ground grid defect diagnosis is performed, the design principle of the power amplifying circuit 3 is as follows: (1) the working frequency is within the frequency band of 10 Hz-50 kHz; (2) the frequency of the output signal and the output current can be conveniently and continuously adjusted; (3) the self-continuous work can be realized under the condition of ensuring that the output signal has enough driving current. In order to meet the above requirement, in the present embodiment, a linear power amplification technology is adopted, the power amplification circuit 3 includes an input stage 31, a push stage 32, an output stage 33 and a protection stage 34, the output of the final stage adopts an output form that 10 pairs of high-power transistors form a complementary push-pull parallel connection, and the models of the transistors are 2SC5200 and 2SA 1943. Specifically, the input stage 31 is configured to receive a primary excitation signal output from a sinusoidal signal generator and/or a pulse signal generator, and sequentially send the primary excitation signal to the push stage 32 and the output stage 33 for processing, and finally obtain a sinusoidal excitation signal or a pulse excitation signal; the input stage 31 is used for suppressing zero drift and temperature drift of the circuit and enabling the output voltage of the power amplifying circuit 3 in a static state to be zero, so that stable and reliable work of the circuit is guaranteed; the purpose of the push stage 32 is to provide sufficient drive current for the output stage 33; the output stage 33 functions to provide signal power to the load; the protection stage 34 is connected to the driver stage 32 and the output stage 33, respectively, and functions to protect the circuit from being burned out when the driver stage 32 and the output stage 33 amplify the primary excitation signal. In the prior art, the operation principle and design method of the input stage 31, the push stage 32, the output stage 33 and the protection stage 34 are well established (refer to the Scheran-transistor low-frequency circuit, people post and telecommunications Press, 1981:275-295), and will not be described in detail herein. The impedance converter 4 includes a primary coil, a secondary coil, and an iron core, the iron core is an annular iron core made of nanocrystalline material, and the primary coil and the secondary coil are wound on the iron core. The primary coil is connected with the power amplifying circuit 3, the secondary coil is provided with N taps for connecting with a grounding grid load, the N taps correspond to different primary and secondary coil transformation ratios respectively, and the primary and secondary coil transformation ratios refer to the ratio of the number of turns of the primary coil to the number of turns of the secondary coil; wherein N is an integer of 1 or more.
The impedance transformer 4 is designed according to the circuit theory. Since the load is much smaller than the output impedance of the transistor, the output current of the power output stage 33 is a simple harmonic, a current source is used as its equivalent circuit, and all parameters of the impedance transformer 4 are reduced to the primary value of the transformer, so that the equivalent circuit of the impedance transformer 4 and the load is as shown in fig. 2.
In FIG. 2, C1Distributing capacitance, C 'for the primary coil'2＝C2/n2Distributing the value of the capacitance reduced to the primary for the secondary winding, r1Is copper-resistant of the primary coil, r'2＝n2r2Is reduced to a primary value, L, for the copper resistance of the secondary coil1Is leakage inductance of the primary coil of L'2＝n2L2For secondary winding leakage inductance to be reduced to a primary value, L0Is excitation inductance, R'L＝n2RLFor secondary load resistance reduced to a primary value, N ═ N1/N2Is the ratio of the primary to the secondary. In the middle frequency band, the distributed capacitance and the exciting inductance are regarded as open circuits, the leakage inductance is regarded as a short circuit, and the total impedance of the load of the power amplifier is as follows:
RO＝r1+r′2+R'L(1)
the conversion efficiency of the impedance converter 4 is:
formula (III) ηTFor the conversion efficiency, 0.9 is generally adopted, and the transformation ratio can be designed according to the formula (2). In the low frequency band, the distributed capacitance is still regarded as an open circuit, the leakage inductance is regarded as a short circuit, and the following can be listed according to the circuit theory:
the lower limit frequency is taken as:
when the load and the lower limit frequency are determined, the inductance L is excited0Can be obtained from the formula (4).
The magnetic core of the impedance transformer 4 adopts an annular nanocrystalline iron core, as shown in figure 3, the saturation magnetic induction intensity Bs is more than 1.24T, and the effective magnetic conductivity reaches 105The sectional area of the iron core can be calculated according to an empirical formula, and S is 0.2PLfl(cm2) In the formula PLPower output to the load by the impedance transformer 4, flIs a lower limit frequency; number of primary coil turns
l0To excite the inductance,/cThe average length of the magnetic circuit of the iron core is shown, and S is the sectional area of the magnetic core.
The electrical schematic of the impedance transformer 4 is shown in fig. 4, with four taps having transformation ratios 2:1, 1:1, 2:3 and 1:2 to meet different measurement requirements. In this embodiment, the primary coil has a winding wire diameter of 2.0mm (i.e., +/-2.0 in the figure), a number of turns of 160 (i.e., 160T in the figure), and an input current of 30A; the secondary coil is provided with four taps, the winding wire diameter of the secondary coil is 3.7mm (i.e., +/-3.7 in the figure) at the first tap, 2.0mm (i.e., +/-2.0 in the figure) at the second tap, 1.4mm (i.e., +/-1.4 in the figure) at the third tap and the fourth tap, the number of turns at the four taps is 80 (i.e., 80T in the figure), and the output current is 60A. The thickness of the iron core is 75mm, the inner diameter is 180mm, and the outer diameter is 260 mm. Specifically, when a first tap is selected as the output end of the impedance rheostat, the transformation ratio of the primary coil and the secondary coil is 2: 1; when the second tap is selected as the output end of the impedance rheostat, the transformation ratio of the primary coil and the secondary coil is 1: 1; when the third tap is selected as the output end of the impedance rheostat, the transformation ratio of the primary coil and the secondary coil is 2: 3; when the fourth tap is selected as the output end of the impedance rheostat, the transformation ratio of the primary coil and the secondary coil is 1: 2.
The output end of the power amplifying circuit 3 is connected with the primary winding (i.e. the primary coil) of the impedance transformer 4, and according to the measurement requirement, a proper secondary winding is selected, i.e. a proper tap of the secondary coil is selected as the output end, if a higher excitation voltage signal is required to be output, the primary and secondary coil transformation ratio of 2:3 or 1:2 is selected, and if a higher excitation current signal is required to be output, the primary and secondary coil transformation ratio of 2:1 or 1:1 is selected. Specifically, when measuring a potential signal of the grounding grid, a 1:2 primary coil transformation ratio and a 2:1 secondary coil transformation ratio are selected if an excitation signal of high voltage and low current needs to be injected into the grounding grid, and when measuring a magnetic field signal of the grounding grid, a low voltage and high current needs to be injected into the grounding grid. It can be seen that, in the present embodiment, the load requirement of the power amplifier is satisfied in a wider frequency band by the design of the primary coil; by adopting multi-tap output of the secondary coil, the method of changing the transformation ratio of the primary coil and the secondary coil is realized, and the output current or voltage is increased according to the actual measurement requirement to obtain the required excitation signal; the selection of the material of the magnetic core (namely the iron core) can ensure that the conversion efficiency is better under the condition of larger working current in a working frequency band. Through the improvement of the existing linear power amplifier and the design of the impedance converter, under the condition of ensuring enough current output capacity in a wider frequency band, the problem of load matching of the power amplifier and a grounding grid is solved, different loads can be adapted, the continuous adjustment of frequency and current is realized, two working modes of sine waves and pulse signals with adjustable duty ratio are provided, higher output voltage or excitation current signals can be obtained through the selection of the transformation ratio of the impedance converter according to the measurement requirement, and meanwhile, the output voltage or the excitation current signals can be displayed in real time through the current frequency display unit 5.
As shown in fig. 5, the signal detection system includes a detection coil L, a signal processing circuit and an acquisition and analysis system C, wherein a signal output end of the detection coil L is connected to an input end of the signal processing circuit, and an output end of the signal processing circuit is connected to an input end of the acquisition and analysis system C. The signal processing circuit consists of an instrument amplifier YF, a power frequency trap XB, a band-pass filter LB and a phase-locked amplifier SXF, wherein the input end of the instrument amplifier YF is connected with a detection coil L, the output end of the instrument amplifier YF is connected with an acquisition and analysis system C through the power frequency trap XB, the band-pass filter LB and the phase-locked amplifier SXF in sequence, the reference signal input end S of the phase-locked amplifier SXF is connected with the excitation reference signal output end, and the clock signal input end f of the bandCLKAnd is connected with the output end of the clock pulse generator. Because the electromagnetic environment of the transmission line is very complex, the power frequency is dryThe disturbance can reach dozens of micro-meters (mu T), meanwhile, electromagnetic interference caused by harmonic waves, knife switch switches, line current changes and the like exists, in order to effectively detect the magnetic field distribution of the earth surface, firstly, a detection coil L is utilized to convert earth surface magnetic induction intensity signals into induced voltage signals, and the detection coil L in the embodiment comprises a detection coil frame with an integrated structure, detection coil shielding plates and detection coil wave guide tubes, wherein the detection coil shielding plates and the detection coil wave guide tubes are respectively arranged on two sides of the width of the detection coil frame; the signal leakage condition caused by splicing gaps can be reduced through the detection coil frame with the integrated structure; through setting up the detection coil shield plate of detection coil frame width both sides can improve the shielding effect of coil, makes things convenient for detection coil's installation, improves production efficiency. Then, an instrument operational amplifier is used as a buffer stage and used for inhibiting common mode interference and impedance transformation, a power frequency trap circuit inhibits 50Hz strong interference, after technical processing such as power frequency trap, filtering, phase-locked amplification is carried out on signals, a data acquisition system C is used for storing a measurement result into a computer, the power frequency trap circuit has 50dB of 50Hz trap depth, a band-pass filter circuit attenuates about 3dB at +/-10 Hz, 25dB at +/-45 Hz and 50dB at +/-90 Hz, and after trap and filtering processing, the power frequency interference must be inhibited; the band-pass filter has narrow passband bandwidth, the center frequency can be continuously adjusted and can be adjusted within the range of 200-900 Hz, and the appropriate excitation signal frequency and the center frequency of the receiving system are set according to the actual electromagnetic background of a measurement site, so that useful signals can be effectively extracted.
In addition, as shown in fig. 6 and 7, the present embodiment is further provided with a fault detector 6, the system can detect the current change more directly and more actively through the fault detector 6, and when the current value exceeds the normal current, an alarm can be given in time, so as to facilitate the timely processing. The fault detector 6 comprises a signal receiver 61, a signal amplifier 62, a filter 63, an analog to digital converter 64, an alarm module 65 and a display module 66. The signal receiver 61 is used for receiving and acquiring an output voltage or excitation current signal of the impedance transformer 4; the signal amplifier 62 is connected with the signal receiver 61 and is used for amplifying the received output voltage or excitation current signal; the filter 63 is connected with the signal amplifier 62 and is used for filtering the amplified output voltage or excitation current signal; the analog-to-digital converter 64 is connected with the filter 63, and is connected with the standard voltage as an analog-to-digital conversion reference to convert the filtered output voltage or excitation current signal into a digital signal; the alarm module 65 performs sound and light alarm if the received digital signal is a fault signal; the display module 66 is configured to display a voltage value corresponding to the digital signal. Latent faults can be found as soon as possible by the fault detector 6, which is the main means to ensure safe operation and normal maintenance of the electrical equipment.
The embodiment of the utility model provides an excitation source system is through the improvement and the design of impedance converter to current linear power amplifier, in the broad frequency band, under the condition of guaranteeing enough current output capacity, the problem of power amplifier and ground net load matching has been solved, can adapt to different loads, frequency and continuous adjustable of electric current have been realized, possess two kinds of working methods of sine wave and duty ratio adjustable pulse signal, can be according to the measurement needs, through the selection of impedance converter transformation ratio, obtain higher output voltage or excitation current signal, the frequency and the electric current of output signal have the charactron to show in good time simultaneously, high durability and convenient use, and wide use, can satisfy the multiple needs of transmission line ground net ground connection performance detection and fault diagnosis; the system can detect the current change more directly and more actively through the fault detector, and can give an alarm in time when the current value is different from the normal current, so that the system is convenient to process in time; the signal detection system is based on an electromagnetic induction principle and a phase-locked amplification technology, the magnetic induction intensity excited by a grounding grid conductor on the ground surface is converted into an induced voltage signal by using a detection coil, the signal is filtered, amplified and extracted in a phase-locked manner under a complex electromagnetic environment of a power transmission line, the magnetic induction intensity distribution excited by the injection current on the ground surface is further obtained, the electromagnetic interference on the site can be effectively inhibited through the matching with the excitation signal frequency, the main interference frequency point is set aside, and the measurement precision and the resolution can meet the defect diagnosis requirement.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and all of them fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides a detection equipment for ground net defect diagnosis, its characterized in that, includes excitation source system and signal detection system, excitation source system includes power supply, function signal generator, power amplifier circuit, impedance converter, current frequency display unit and fault detector, power supply respectively with function signal generator, power amplifier circuit and current frequency display unit link to each other, function signal generator, power amplifier circuit, impedance converter connect gradually, impedance converter still respectively with current frequency display unit, fault detector and ground net load are connected, fault detector is including signal receiver, signal amplifier, wave filter, analog-to-digital converter, alarm module and the display module who connects gradually.
2. The device according to claim 1, characterized in that said function signal generator comprises a control and regulation circuit, a signal generation circuit and an amplification output stage, said power amplification circuit comprises an input stage, a push stage, an output stage and a protection stage, said protection stage is connected with said push stage and said output stage respectively, said impedance converter comprises a primary coil, a secondary coil and a core, said core is made of annular nanocrystalline material, and said primary coil and said secondary coil are wound on said core.
3. The apparatus of claim 1, wherein the signal detection system comprises a detection coil, a signal processing circuit and an acquisition and analysis system, the signal output end of the detection coil is connected with the input end of the signal processing circuit, and the output end of the signal processing circuit is connected with the input end of the acquisition and analysis system.
4. The apparatus of claim 3, wherein the detection coil comprises a detection coil frame, a detection coil shielding plate and a detection coil waveguide, the detection coil frame is of an integrated structure, and the detection coil shielding plate and the detection coil waveguide are respectively arranged on two sides of the width of the detection coil frame.
5. The apparatus of claim 2, wherein the control and regulation circuit comprises a sinusoidal signal control and regulation circuit and a pulse signal control and regulation circuit, the signal generation circuit comprises a sinusoidal signal generation circuit and a pulse signal generation circuit, and the amplification output stage comprises a sinusoidal signal amplification output stage and a pulse signal amplification output stage.
6. The apparatus of claim 2, wherein the primary coil is connected to the power amplifier circuit, and the secondary coil has N taps disposed thereon for connection to the ground grid load, the N taps corresponding to different primary and secondary coil transformation ratios, wherein N is an integer greater than or equal to 1.
7. The apparatus of claim 6, wherein the primary coil has a winding wire diameter of 2.0mm and a number of turns of 160; the secondary coil is provided with four taps, the winding wire diameter of the secondary coil is 3.7mm at the first tap, 2.0mm at the second tap, and 1.4mm at the third tap and the fourth tap, and the number of turns of the four taps is 80.
8. The apparatus of claim 2, wherein the core has a thickness of 75mm, an inner diameter of 180mm, and an outer diameter of 260 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920302547.5U CN210181151U (en) | 2019-03-11 | 2019-03-11 | Detection equipment for grounding grid defect diagnosis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920302547.5U CN210181151U (en) | 2019-03-11 | 2019-03-11 | Detection equipment for grounding grid defect diagnosis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210181151U true CN210181151U (en) | 2020-03-24 |
Family
ID=69829935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920302547.5U Active CN210181151U (en) | 2019-03-11 | 2019-03-11 | Detection equipment for grounding grid defect diagnosis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210181151U (en) |
-
2019
- 2019-03-11 CN CN201920302547.5U patent/CN210181151U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101216523B (en) | Substation grounding net defect diagnostic method and apparatus | |
| CN103926514B (en) | High voltage equipment insulation diagnostic method under a kind of charging operation state | |
| CN201138368Y (en) | Defect diagnostic equipment for substation grounding grid | |
| CN101699301B (en) | Method for measuring line parameter through induced electricity | |
| CN103792461A (en) | Grounding grid breakpoint diagnostic method for transient electromagnetic method | |
| CN204065297U (en) | A kind of 35kV dry reactor turn-to-turn short circuit pick-up unit based on row wave technology | |
| CN204188757U (en) | Portable power equipment leakage point insulating pick-up unit | |
| CN211698044U (en) | Weak magnetic induction intensity measuring system for grounding grid defect diagnosis | |
| CN105891606A (en) | Device for testing tower grounding resistance through disassembly-free ground lead | |
| CN207473034U (en) | A kind of grounding net defect diagnostic device | |
| CN204188673U (en) | A kind of Ground Network of Transmission Line with Renovation detects dedicated power supply apparatus | |
| CN206074741U (en) | Detection circuit for grounding grid defect diagnosis | |
| CN205404706U (en) | Electric automobile fills electric pile's electric energy quality dynamic monitoring system based on DSP | |
| CN210181151U (en) | Detection equipment for grounding grid defect diagnosis | |
| CN204679586U (en) | A kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density | |
| CN204679563U (en) | A kind of grounding net of transformer substation corrosion detection system based on surface potential | |
| JP4112871B2 (en) | Lightning strength diagnosis method | |
| CN205139294U (en) | Ground net corrodes situation testing arrangement based on wireless sensor network | |
| CN209878912U (en) | Grounding grid signal detection system | |
| CN203159712U (en) | Substation grounding grid anti-corrosion and monitoring device based on modular design | |
| CN209927283U (en) | Converter transformer vibration signal testing and state monitoring device | |
| CN205091423U (en) | A DC signal intelligent acquisition device for high tension cable fault locating | |
| CN209690439U (en) | A kind of grounding net defect diagnostic system | |
| CN207832854U (en) | A kind of driving source system for grounded screen detection | |
| CN208076645U (en) | A kind of signal detection system for grounding net defect diagnosis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |