CN106597113B - Power line iron tower ground resistance on-line tester based on proportion detection - Google Patents
Power line iron tower ground resistance on-line tester based on proportion detection Download PDFInfo
- Publication number
- CN106597113B CN106597113B CN201611025568.4A CN201611025568A CN106597113B CN 106597113 B CN106597113 B CN 106597113B CN 201611025568 A CN201611025568 A CN 201611025568A CN 106597113 B CN106597113 B CN 106597113B
- Authority
- CN
- China
- Prior art keywords
- coil
- detection
- grounding
- iron tower
- power line
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
Abstract
The invention belongs to the technical field of ground resistance testing, and provides an on-line tester for the ground resistance of a power line iron tower based on proportion detection, which is used for realizing the on-line testing of the ground resistance of the power line iron tower under the condition of not disconnecting a ground down lead; the invention comprises a plurality of detection heads, a sampling chuck, an auxiliary electrode and a signal processing module, wherein the parameters of the detection heads are the same, each grounding down lead is provided with one detection head, the sampling chuck is fixed on any grounding down lead, the auxiliary electrode is inserted into the ground, and the signal processing module is used for controlling and processing data. The invention can ensure that the test of the grounding resistance of the power line iron tower can be realized under the condition of not disconnecting the down lead, has high test precision, strong anti-interference capability and low manufacturing cost of the tester, and is beneficial to realizing intelligent network monitoring of the data of the grounding resistance of the power line iron tower in an internet of things mode.
Description
Technical Field
The invention belongs to the technical field of ground resistance testing, relates to a ground resistance testing technology of a power line iron tower, and particularly relates to an on-line tester for ground resistance of the power line iron tower based on proportion detection.
Background
In order to ensure the safe and stable operation of the high-voltage transmission line and reduce the harm caused by lightning stroke, grounding networks are laid on high-voltage transmission iron towers. In order to improve the grounding effect, besides the grounding network of a single iron tower, the iron towers are sequentially communicated through an overhead line, and grounding current flows into the ground through the grounding network of the single iron tower and also flows into the ground through the grounding network of an adjacent iron tower through the overhead line; obviously, the grounding resistance of each iron tower needs to be controlled within a certain range.
At present, two main methods for measuring the grounding resistance of the iron tower are available, one is to disconnect the grounding down lead of the iron tower and adopt a mechanical megger type or electronic ground resistance meter to measure by a three-wire method, and the other is to measure by a clamp meter which appears in recent years. The problem of measurement by using the existing three-wire method is that the grounding down-lead needs to be disconnected, so that manual participation is needed, the detection efficiency is low, and each iron tower can only detect a limited number of times per year; the measurement of the clamp meter assumes that the parallel resistance of other iron towers is extremely small, which does not meet the actual situation, and meanwhile, the measurement mode of the clamp meter cannot carry out measurement due to the influence of the down lead when the iron tower has double-grounded down leads or even multiple grounded down leads. At present, the internet of things is adopted to monitor the resistance value of the ground grid of each iron tower, the working mode of manual inspection is replaced, the detection efficiency, the frequency and the flexibility are greatly improved, the requirement is realistic, the problem of manual participation must be solved at first, and the condition that the grounding down lead is not disconnected is the most important premise. In order to solve the problem that the grounding resistance of the iron tower can be measured without disconnecting the grounding down conductor, a method for measuring the current of each down conductor by adding a current detection coil on the basis of a three-wire method has been proposed in the prior art, which is feasible in principle, but the measurement method requires that the current detection coil needs extremely high precision when measuring the current, so the measurement method is very complex in practical application. Based on the above, the invention provides a mode based on proportion detection, the excitation current of the coil does not need to be accurately calibrated in the test process when the coil is used as an excitation coil, the requirement on the detection precision of the coil when the coil is used as a current detection coil is also not needed, and the related calculation is simple, reliable and convenient to realize.
disclosure of Invention
The invention aims to provide an on-line tester for the ground resistance of a power line iron tower based on proportion detection, which is used for realizing on-line testing of the ground resistance of the power line iron tower under the condition of not disconnecting a grounding down lead, so that the data of the ground resistance of the power line iron tower can realize network monitoring in an internet of things mode; and the tester adopts a proportion detection scheme, absolute accurate detection of current is not needed, the realization is convenient, more importantly, the online detection function is realized, only one auxiliary electrode is needed, and compared with a three-wire method test, the construction cost and difficulty are greatly reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
An on-line tester for grounding resistance of a power line iron tower based on proportion detection comprises a plurality of detection heads, a sampling chuck, an auxiliary electrode and a signal processing module, and is characterized in that the parameters of the detection heads are the same, each detection head is composed of an upper coil and a lower coil which are independent and have the same parameters, the upper coil and the lower coil are annularly sleeved with a grounding down lead and are not in contact, and each grounding down lead corresponds to one detection head; the sampling chuck is fixed on any one grounding down lead and positioned between the upper coil and the lower coil of the detection head, and the sampling chuck is kept conducted with the grounding down lead; the auxiliary electrode is inserted into the ground; the signal processing module is connected with the upper coil and the lower coil of each detection head and the auxiliary electrode and is used for control and data processing.
Further, the test method of the online tester for the grounding resistance of the power line iron tower comprises the following steps:
u d s u d sStep 1, a signal processing module is used for controlling, and connecting a corresponding detection head on a grounding down-lead provided with a sampling chuck, so that an upper coil and a lower coil of the detection head work as a current detection coil, meanwhile, connecting an auxiliary electrode, connecting the sampling chuck with a sampling resistor with a resistance value of Rs, then connecting the sampling resistor with the common ground of the signal processing module, and keeping the rest detection heads disconnected;
t p p tStep 2, all the detection heads, the auxiliary electrodes and the sampling chucks are connected through the control of the signal processing module, the upper coils in all the detection heads are used as exciting coils, the lower coils in all the detection heads are used as current detection coils, and the sampling chucks are connected with the common ground of the signal processing module;
And 3, calculating to obtain a measured value of the grounding resistance of the power line iron tower: rg is δ ρ.
Furthermore, the testing method further comprises the following steps: and (4) repeating the steps 1 to 3 to obtain the grounding resistance measured values under a plurality of random frequencies to form a sequence set, and obtaining the grounding network resistance value as an output result through statistical processing.
In the invention, the auxiliary electrode is inserted into the ground according to a P pole distance standard and a C pole depth standard in the traditional three-wire method test. All the coil parameters are required to be consistent and are formed by an iron core and a plurality of circles of enameled wires wound outside; for the convenience of installation, each detection head structurally consists of two independent and identical semi-cylindrical components (an upper coil and a lower coil), and is fastened into a complete assembly after being installed on the grounding down conductor, so that the same function of the complete detection assembly is achieved.
u d s u d s u d u u d d u d s u d s s s u d s t t p p t t p t p t t tThe invention has the working principle that all coil parameters in a detection head arranged on a grounded down-lead coil are the same, the coil is switched on and off and the function of the coil is determined to be an exciting coil or a current detection coil according to the requirement of the test, in the test of each frequency sine wave, the upper coil, the lower coil and the sampling chuck in the detection head with a clamp head (sampling chuck) are selected to be effective through a signal processing module, the sampling chuck is connected with a grounding resistor Rs to a common ground of a signal processing board, when the current is sent by an auxiliary electrode, the sum of the upper current i and the lower current i at the sampling chuck on the grounded down-lead wire is the current i on the sampling chuck, the upper current i and the lower current detection coil output is the voltages v and v, the sampling voltage corresponding to the sampling resistor v is the v, the output amplitude of the current detection coil is smaller considering that the output amplitude of the current detection coil is the current detection coil, a primary beta amplification can be designed for the detection head, the signal processed by a signal processor is the beta, the beta.v.v.v.i at the upper coil and the upper coil is the voltage v.i, the middle coil, the coil is obtained by the voltage ratio of the voltage v.v/i, the coil is obtained by the upper coil, the voltage of the coil, the upper coil is obtained by the voltage of the upper coil, the coil is obtained by the voltage of the lower coil, the coil is obtained by the voltage of the coil, the coil is obtained by the voltage g.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.i, the coil is obtained by the voltage of the middle coil, the coil is obtained by the coil, the coil is obtained by the upper coil, the upper coil is obtained by the upper coil, the middle coil, the upper coil is obtained by the step of the coil, the middle coil, the upper coil, the middle coil is obtained by the step of the coil, the middle coil, the step of the coil is the step of the coil, the step of the coil, the step of the coil is used for the coil, the coil is used for the step of the coil, the step of the coil, the step of the.
the invention has the beneficial effects that:
The invention provides a power line iron tower grounding resistance on-line tester based on proportion detection, because all coils adopt the same parameters, and determine whether the coils are exciting coils or current detecting coils according to requirements, the testing process does not need to accurately calibrate exciting currents when the coils are used as exciting coils, does not need to provide requirements for detection accuracy when the coils are used as current detecting coils, has simple, reliable and convenient related calculation, ensures that the grounding down lead and an iron tower are not required to be disconnected to measure in principle, achieves the aim of directly testing the grounding network grounding resistance value on-line, only needs one auxiliary electrode, is more convenient in construction, and is particularly suitable for some special terrains. Meanwhile, in the testing process, a Fourier transform algorithm is adopted for signal processing, and comprehensive processing of testing results under a plurality of completely random frequency sine waves is combined, so that the earth resistance tester has strong anti-interference and anti-mutual-interference performances, and relatively accurate values can be obtained even if a plurality of iron towers are used for simultaneous measurement. The online measurement function enables data of the grounding resistance of the power line iron tower to be directly uploaded in a mode of the Internet of things, the manual inspection mode of the power line iron tower is effectively replaced, the detection efficiency, frequency and flexibility are greatly improved, and the monitoring of the grounding resistance of the power line iron tower is more convenient and reliable.
Drawings
fig. 1 is a schematic diagram of the principle of the power line iron tower ground resistance on-line tester based on the ratio detection of the present invention, wherein 1 is a detection head with a sampling chuck, 2 is a detection head without a sampling chuck, 3 is an auxiliary electrode, 4 is a signal processing module, 5 is an upper coil, 6 is a sampling chuck, 7 is a lower coil, 8 is an upper coil, and 9 is a lower coil.
FIG. 2 is a schematic diagram of a signal flow of a coil current-voltage current ratio parameter test according to the present invention.
FIG. 3 is a signal flow diagram of the voltage ratio parameter test according to the present invention.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings and examples.
as shown in fig. 1, a schematic diagram of a testing principle of an online tester for a ground resistance of a dual-ground downlead power line iron tower provided in this embodiment is shown; the two grounding down-lead wires are respectively provided with a detection head 1 with a clamp head and a detection head 2 without the clamp head, the installation direction is not inverted, in addition, the auxiliary electrode 3 is inserted into the ground according to the P pole distance standard and the C pole depth standard in the traditional three-wire method test, and the detection head 1 with the clamp head, the detection head 2 without the clamp head and the auxiliary electrode 3 are connected with a tester host (a signal processing module) through a connector; the parameters of the individual coils are identical.
the test head with clamp 1 and the test head without clamp 2 are independent parts, and should include additional parts such as fastening, water-proof, etc. in addition to the key upper and lower coils, the sampling clamp 6 and the lead-out wire, so as to ensure long-term use in the field.
as shown in fig. 2, a signal flow diagram of a coil current detection characteristic parameter test is shown:
Corresponding to the testing step 1, taking FPGA as a signal processing chip as an example, the FPGA controls the relay to enable the upper coil 5 and the lower coil 7 with the clamp detection head to work in a current detection coil mode, the sampling clamp 6 is switched on, a sampling resistor Rs is arranged between the sampling clamp and the signal processing board 10 in common, and the auxiliary electrode 3 is switched on; after the filter is switched on stably, the FPGA generates a sine wave data sequence, and a sine wave is output through a D/A conversion circuit 11, wherein the frequency of the sine wave has randomness but is positioned in a gain flat area of a band-pass filter; the sine wave is provided with enough current and almost standard sine wave waveform through the driving circuit 12 and is injected into the ground from the auxiliary electrode 3; the voltages output by the two coils of the detection head 1 with the clamp head are subjected to analog addition through an analog adder 13, then are sent into the FPGA through an A-path bandpass filter 14, an amplifier 15 and an A/D converter 16, the sampling voltage on a sampling resistor Rs is also sent into the FPGA through a B-path bandpass filter 17 and the A/D converter 16, the FPGA adopts a Fourier transform algorithm to extract effective values of two paths of signals, and then adopts a division algorithm to obtain the ratio of the two paths of signals, so that beta.rho is correspondingly obtained.
As shown in fig. 3, a signal flow diagram of the voltage ratio parameter test is shown:
Corresponding to the test step 2, the FPGA controls the relay to enable all the coils to be communicated, all the upper coils 5 and 8 to work in an excitation coil mode, all the lower coils 7 and 9 work in a current detection coil mode, the sampling chuck 6 is communicated with the common ground of the signal processing board, and the auxiliary electrode 3 is connected to be used as a ground voltage sampling point; after the switching-on is stable, the FPGA generates a sine wave data sequence, sine waves are output through a D/A conversion circuit 11, the frequency of the sine waves is the same as that of the step 1, and the sine waves are simultaneously provided for all exciting coils, namely upper coils, after passing through a driving circuit 12; the voltage signals output by all current detection coils (lower coils) are subjected to analog addition firstly, are sent into the FPGA through an A-path band-pass filter 14, an amplifier 15 and an A/D converter 16, meanwhile, the voltage obtained on the auxiliary electrode is also sent into the FPGA through a B-path band-pass filter 17 and an A/D converter 18, the FPGA adopts a Fourier transform algorithm to extract effective values of two paths of signals, and then adopts a division algorithm to obtain the ratio of the two paths of signals, so that delta/beta is obtained on site.
Processing the data obtained in the first two steps by using a relational expression Rg (beta. rho) · (delta/beta) to obtain an Rg value; the FPGA randomly generates a new sine wave data sequence according to the signal data input by the A/D, the frequency of the sine wave data sequence is still limited within the range, and a new ground resistance value of the grounding network is repeatedly obtained according to the process; a sequence set of the earth resistance values can be obtained through the reciprocating operation, and the finally calculated resistance value of the earth network is obtained through a statistical processing mode.
The signal processing module can adopt FPGA, also can adopt chips such as singlechip, DSP, no matter adopt any chip, all require can accomplish the calculation of Fourier transform, resistance value and statistical method and obtain final resistance calculation result.
The online monitoring grounding resistance tester manufactured by the invention can realize online testing of the grounding resistance of the power line iron tower, does not need to disconnect a grounding down lead, and provides convenience for testing the grounding resistance of the power line iron tower; the coil with consistent parameters and the proportion detection mode are adopted, the response parameters when the coil is used as a current detection coil do not need to be accurately calibrated, the driving current when the coil is used as an exciting coil does not need to be accurately calibrated, and the influence of frequency change is avoided, so that the method is convenient to realize; due to the online testing function, relevant data only need to be transmitted to the server in the Internet of things mode, monitoring is directly conducted on a computer or a mobile phone through software, and when detection is conducted can be flexibly set according to needs, so that the traditional manual inspection mode in the power industry can be completely replaced, and the detection efficiency is greatly improved.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (2)
1. An on-line tester for grounding resistance of a power line iron tower based on proportion detection comprises a plurality of detection heads, a sampling chuck, an auxiliary electrode and a signal processing module, and is characterized in that the parameters of the detection heads are the same, each detection head is composed of an upper coil and a lower coil which are independent and have the same parameters, the upper coil and the lower coil are annularly sleeved with a grounding down lead and are not in contact, and each grounding down lead corresponds to one detection head; the sampling chuck is fixed on any one grounding down lead and positioned between the upper coil and the lower coil of the detection head, and the sampling chuck is kept conducted with the grounding down lead; the auxiliary electrode is inserted into the ground; the signal processing module is connected with the upper coil and the lower coil of each detection head and the auxiliary electrode and is used for control and data processing; the test method of the power line iron tower grounding resistance on-line tester comprises the following steps:
u d s u d sStep 1, a signal processing module is used for controlling, and connecting a corresponding detection head on a grounding down-lead provided with a sampling chuck, so that an upper coil and a lower coil of the detection head work as a current detection coil, meanwhile, connecting an auxiliary electrode, connecting the sampling chuck with a sampling resistor with a resistance value of Rs, then connecting the sampling resistor with the common ground of the signal processing module, and keeping the rest detection heads disconnected;
t p p tStep 2, all the detection heads, the auxiliary electrodes and the sampling chucks are connected through the control of the signal processing module, the upper coils in all the detection heads are used as exciting coils, the lower coils in all the detection heads are used as current detection coils, and the sampling chucks are connected with the common ground of the signal processing module;
and 3, calculating to obtain a measured value of the grounding resistance of the power line iron tower: rg is δ ρ.
2. The method for testing the on-line tester for the grounding resistance of the power line tower according to claim 1, wherein the method further comprises the steps of: and (4) repeating the steps 1 to 3 to obtain the grounding resistance measured values under a plurality of random frequencies to form a sequence set, and obtaining the grounding network resistance value as an output result through statistical processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025568.4A CN106597113B (en) | 2016-11-22 | 2016-11-22 | Power line iron tower ground resistance on-line tester based on proportion detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025568.4A CN106597113B (en) | 2016-11-22 | 2016-11-22 | Power line iron tower ground resistance on-line tester based on proportion detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106597113A CN106597113A (en) | 2017-04-26 |
| CN106597113B true CN106597113B (en) | 2019-12-10 |
Family
ID=58592319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611025568.4A Active CN106597113B (en) | 2016-11-22 | 2016-11-22 | Power line iron tower ground resistance on-line tester based on proportion detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106597113B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019104058A1 (en) * | 2019-02-18 | 2020-08-20 | Open Grid Europe Gmbh | Grounding system and method for discharging alternating current from a steel structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018571A (en) * | 2012-12-05 | 2013-04-03 | 北京工业大学 | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line |
| CN202994910U (en) * | 2012-12-28 | 2013-06-12 | 广州市铱泰电子科技有限公司 | On-line detector and system for non-contact grounding resistor |
| CN103823101A (en) * | 2014-03-14 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for measuring impact current division coefficient of power transmission line tower with lightning conductor |
| CN104535844A (en) * | 2015-01-20 | 2015-04-22 | 国网辽宁省电力有限公司抚顺供电公司 | Method for testing grounding resistance of tower by using disassembly-free down conductor |
| CN204731317U (en) * | 2015-06-12 | 2015-10-28 | 上海臻和防雷电气技术有限责任公司 | A kind of intelligentized earth resistance tester |
-
2016
- 2016-11-22 CN CN201611025568.4A patent/CN106597113B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018571A (en) * | 2012-12-05 | 2013-04-03 | 北京工业大学 | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line |
| CN202994910U (en) * | 2012-12-28 | 2013-06-12 | 广州市铱泰电子科技有限公司 | On-line detector and system for non-contact grounding resistor |
| CN103823101A (en) * | 2014-03-14 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for measuring impact current division coefficient of power transmission line tower with lightning conductor |
| CN104535844A (en) * | 2015-01-20 | 2015-04-22 | 国网辽宁省电力有限公司抚顺供电公司 | Method for testing grounding resistance of tower by using disassembly-free down conductor |
| CN204731317U (en) * | 2015-06-12 | 2015-10-28 | 上海臻和防雷电气技术有限责任公司 | A kind of intelligentized earth resistance tester |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106597113A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103675623B (en) | GIS partial discharge detection method and system under a kind of surge voltage | |
| CN106841815B (en) | Power line iron tower grounding resistance on-line tester based on voltage excitation | |
| CN202676858U (en) | Partial discharge test system under impulse voltage | |
| CN102914731B (en) | Device for detecting point discharge in transformer oil under impulse voltage based on dual electrodes | |
| CN111948482B (en) | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type | |
| CN113009237A (en) | Tower grounding resistance measurement method and device based on frequency fitting algorithm | |
| CN104569609A (en) | Tower grounding impedance testing method for measuring abnormal frequency current of down leads | |
| CN107656226B (en) | HFCT electrical parameter test device and test method based on transmission coefficient | |
| CN101881804B (en) | Method and device for detecting composite insulator on line | |
| CN206311522U (en) | A kind of soil sensor | |
| CN205749844U (en) | A kind of power supply ripple test Apparatus and system | |
| CN106597113B (en) | Power line iron tower ground resistance on-line tester based on proportion detection | |
| CN202102047U (en) | High-tension side small current tester | |
| CN110456176A (en) | A kind of calculation method of high altitude localities ultra-high-tension power transmission line radio interference level | |
| CN107765084B (en) | Universal voltage input power frequency signal frequency measurement system | |
| CN207908626U (en) | A kind of simulation high frequency Partial discharge signal generating means | |
| CN216411412U (en) | Multiport transmission tower ground resistance measuring equipment | |
| CN206990679U (en) | A kind of power line steel tower grounding resistance In-circiut tester based on voltage drive | |
| CN104833883B (en) | A kind of earth mat method of testing based on 10 35kV short circuit groundings | |
| CN109782071B (en) | Pole tower grounding resistance measurement method based on earth surface voltage | |
| CN207232365U (en) | A kind of inspection circuit of partial discharge of transformer high frequency measuring instrument detection frequency band | |
| CN113820536A (en) | Zinc oxide arrester live-line detection method based on wireless synchronous current measurement technology | |
| CN102004854A (en) | Method for acquiring nonlinear load equivalent impedance parameters of distribution network in real time | |
| Karnas et al. | Calibration of electric field antennae operating in the ELF-MF frequency range at the lightning research station in Rzeszow | |
| CN112327221A (en) | Transformer internal insulation defect live-line diagnosis device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |