CN106771638A - A kind of power line steel tower earth resistance In-circiut tester based on current ratio detection - Google Patents
A kind of power line steel tower earth resistance In-circiut tester based on current ratio detection Download PDFInfo
- Publication number
- CN106771638A CN106771638A CN201611025561.2A CN201611025561A CN106771638A CN 106771638 A CN106771638 A CN 106771638A CN 201611025561 A CN201611025561 A CN 201611025561A CN 106771638 A CN106771638 A CN 106771638A
- Authority
- CN
- China
- Prior art keywords
- steel tower
- current
- power line
- current detecting
- line steel
- 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.)
- Granted
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 earth resistance technical field, there is provided a kind of power line steel tower earth resistance In-circiut tester based on current ratio detection, power line steel tower earth resistance is tested under conditions of not turning off down conductor for realization；Tester of the present invention includes current detecting main part, several current detecting auxiliaries, electric current sender electrode, voltage sampling electrode and signal processing module, current detecting main part is installed on any one down conductor of power line steel tower, several current detecting auxiliaries are respectively arranged on remaining down conductor, electric current sender electrode and voltage sampling electrode are inserted in ground respectively, and signal processing module is used to control and data processing.The present invention ensure that the test that power line steel tower earth resistance is realized under the conditions of downlead is not turned off, and measuring accuracy is high, strong antijamming capability, tester preparation cost are low, being conducive to the data of power line steel tower earth resistance can realize that intelligent network is monitored by way of Internet of Things.
Description
Technical field
The invention belongs to earth resistance technical field, it is related to the earth resistance technology of power line steel tower, specifically
It is a kind of power line steel tower earth resistance In-circiut tester based on current ratio detection.
Background technology
To ensure ultra-high-tension power transmission line safe and stable operation, the harm that thunderbolt brings is reduced, high-voltage power transmission tower is all laid
There are ground networks.Be to improve earthing effect, in addition to single steel tower ground networks of itself, also by trolley line by each steel tower successively
Connection, by single steel tower, itself earth mat flows into the earth to earth current, and the earth mat for passing through neighbouring an iron rake with three to six teeth also by trolley line flows into big
Ground；Obviously, the earth resistance of each steel tower is required for control within the specific limits.
Currently, steel tower grounding resistance measurement mode mainly has two kinds, and a kind of is to disconnect the down conductor of steel tower, is used
Mechanical megger formula or electronic type ground resistance meter are measured by trilinear method, and another kind is the pincerlike meter measurement for occurring in recent years.Using existing
The problem of trilinear method measurement is that have to be off down conductor, causes manually to participate in, and makes detection efficiency low, each iron
Tower can only be detected a limited number of time every year；The measurement of pincerlike meter assumes that the parallel resistance of other steel towers is minimum, and this hypothesis is simultaneously
Do not meet actual conditions, meanwhile, its metering system steel tower have double down conductors even many down conductors when, under drawing
The influence of line itself, it is impossible to measure.At present, the earth mat resistance of each steel tower is monitored using Internet of Things, replacement is manually patrolled
The working method of inspection, is greatly enhanced detection efficiency, frequency and flexibility, is a kind of demand of reality, but must solve first
The artificial problem for participating in, and it is exactly most important premise not turn off down conductor.To solve not turn off down conductor with regard to energy
Measurement steel tower earth resistance, under having been presented for respectively drawing by increase inspection streamline circle measurement on the basis of trilinear method in the prior art
The method of the electric current of line, says it is feasible in principle, but the measuring method requirement inspection streamline circle measure electric current when need it is high
Precision, therefore, it is extremely complex in actual applications.Based on this, the present invention provides a kind of mode based on current ratio detection,
Streamline circle is examined by parameter identical and detects uplink and downlink electric current simultaneously, current ratio is accurately measured by way of with difference, and
Suitable voltage sampling point is selected, voltage ratio is accurately measured, ground networks resistance value is provided by data processing, it is not necessary to examine
Streamline circle accurate measurement electric current, simpler reliability.
The content of the invention
It is an object of the invention to provide a kind of power line steel tower earth resistance on-line testing based on current ratio detection
Instrument, power line steel tower earth resistance is tested under conditions of not turning off down conductor for realization, and tests easy to be reliable, from
And the data of power line steel tower earth resistance is realized that intelligent network is monitored by way of Internet of Things.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of power line steel tower earth resistance In-circiut tester based on current ratio detection, including current detecting main part 1,
Several current detecting auxiliaries 2, electric current sender electrode 3, voltage sampling electrode 4 and signal processing module 5, it is characterised in that institute
Current detecting main part 1 is stated by examining the structure of streamline circle 8 under top-down one upper 6, sampling chuck 7 of inspection streamline circle and one
Into, it is installed on any one down conductor of power line steel tower, the upper inspection streamline circle 6 and lower inspection streamline circle 8 are located on
Down conductor and noncontact, the sampling chuck 7 are fixed on down conductor and are located at upper inspection streamline circle 6 and lower inspection streamline circle
It is held in the middle of 8 and with down conductor；Described several current detecting auxiliaries 2 be respectively arranged in power line steel tower remaining
On down conductor, not with down conductor install one, each current detecting auxiliary 2 by one be located on down conductor and
Non-contacting inspection streamline circle 9 is constituted；The electric current sender electrode 3 and voltage sampling electrode 4 are inserted in ground respectively；At the signal
The reason connection current detecting of module 5 main part 1, several current detecting auxiliaries 2, electric current sender electrode 3 and voltage sampling electrode 4,
For control and data processing.
Further, all coils use identical parameters in the power line steel tower earth resistance In-circiut tester.
Further, the method for testing of above-mentioned power line steel tower earth resistance In-circiut tester, comprises the following steps：
Step 1, by signal processing module control, upper inspection streamline circle and lower inspection streamline circle in turn-on current detection main part,
Current detecting auxiliary and electric current sender electrode；Signal processing module is sending predeterminated frequency just by electric current sender electrode to the earth
String ripple electric current, measures and examine in each current detecting auxiliary upper inspection streamline circle and lower inspection streamline in streamline circle and current detecting main part
The output voltage of circle, voltage v is added to obtain by the inspection stream coil output voltage simulation of several current detecting auxiliariesa, electric current is examined
Survey the current detecting main part output voltage v of main partdWith voltage vaSimulate to subtract each other and obtain vd-va, the electric current of current detecting main part is examined
Survey main part output voltage vuWith voltage vaSimulation addition obtains vu+va, calculating electric current ratio is：ρ=(vd-va)/(vu+va)；
Step 2, by signal processing module control, sampled in turn-on current detection main part chuck, electric current sender electrode and
Voltage sampling electrode, signal processing module sends the sine wave electricity with step 1 same frequency by electric current sender electrode to the earth
Stream, measures voltage v at the sampling chuck of current detecting main partsWith the voltage v on voltage sampling electrodep, calculate voltage ratio：δ=
vp/vs；
Step 3, signal processing module calculate power line steel tower earth resistance Rg=Rs (δ -1) [(ρ+1)/ρ].
Further, it is further comprising the steps of in above-mentioned method of testing：Repeat step 1 obtains multiple random to step 3
Grounding resistance measurement value under frequency, constitute an arrangement set, by statistical disposition obtain ground networks resistance value be used as it is defeated
Go out result.
Operation principle of the invention is：Due to the presence of power line steel tower trolley line, signal processing module is sent out by electric current
After sending electrode sends the sine-wave current of predeterminated frequency to the earth, current signal is by two paths；One of path is from quilt
Survey the sampled chuck of steel tower ground networks and return to signal processing module, the equivalent resistance in the path is the ground connection electricity of tested steel tower
Resistance Rg；Another path returns to tested steel tower by other steel towers and trolley line, and sampled chuck returns to signal processing module again, should
The equivalent resistance in path is Rt；Sampling chuck is measured using the upper inspection streamline circle in current detecting main part and lower inspection streamline circle respectively
The electric current of upper and lower inflow, while detect the electric current on correspondence downlead with the inspection streamline circle in current detecting auxiliary, according to and it is poor
Relation just can obtain flowing separately through the electric current i of Rg, Rtg、itThe ratio between ρ=ig/it；In addition, sampling chuck to signal processing module
There are a sample resistance Rs, the voltage v at sampling chuck between publiclysWith the voltage v at voltage sampling electrodepRespectively vs
=Rs (ig+it)、vp=vs+igRg, with reference to ρ=ig/it, δ=vp/vs, it is known that Rg=Rs (δ -1) [(ρ+1)/ρ].
The beneficial effects of the present invention are：
The present invention provides a kind of power line steel tower earth resistance In-circiut tester based on current ratio detection, utility
The consistent inspection streamline circle of parameter, the ratio between electric current for flowing through Rg, Rt is extracted by simulating to be added and simulate to subtract each other to process, and is recycled
Relation at voltage sampling electrode between voltage and sample resistance voltage signal, calculates the resistance value of tested ground networks, protects
The test of power line steel tower earth resistance when not turning off downlead is demonstrate,proved；Meanwhile, definitely need not accurately be surveyed in measurement process
Each electric current is measured, and only needs to measure the proportionate relationship between each electric current, therefore require nothing more than each inspection stream coil parameter and tried one's best unanimously,
Also there is the benefit not influenceed by sine wave freuqency, production difficulty and cost is reduced；In addition, signal processor control is using more
Individual random frequency is tested, and obtains multiple earth resistance measuring and calculating values further to carry out statistical disposition, obtains final output knot
Really, anti-mutual interference ability when being measured with stronger antijamming capability and many steel towers simultaneously.
Brief description of the drawings
Fig. 1 is that power line steel tower earth resistance In-circiut tester theory structure of the present invention based on current ratio detection is illustrated
Figure, wherein, 1 is current detecting main part, and 2 is current detecting auxiliary, and 3 is electric current sender electrode, and 4 is voltage sampling electrode, and 5 is letter
Number process plate, 6 is upper inspection streamline circle, and 7 is sampling chuck, and 8 is lower inspection streamline circle, and 9 is inspection streamline circle.
Fig. 2 is the equivalent resistance schematic diagram relevant with test environment.
Fig. 3 is the signal flow schematic diagram that current ratio is extracted.
Fig. 4 is the signal flow schematic diagram that voltage ratio is extracted.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, for the present embodiment provides the online ground connection that double downlead power line steel towers are based on current ratio detection
Resistance meter theory structure schematic diagram：
A set of current detecting main part 1 is installed on a down conductor of steel tower, is pacified on another down conductor
A set of current detecting auxiliary 2 is filled, notices that installation direction does not turn-over, and ensure the correctness of wiring, further according to conventional three-wire
Method earthing test standard determines distance and then (correspondence is electric by electric current sender electrode 3 (corresponding current pole C) and voltage sampling electrode 4
Pressure pole P) insert certain depth in ground；Current detecting main part 1, current detecting auxiliary 2, electric current sender electrode 3 and voltage sampling electricity
Pole 4 is all leaded to be connected by connector with tester main frame 5 (signal processing module), and signal-processing board is arranged on tester
In main frame；The parameter of wherein all inspection streamline circles is consistent；Current detecting main part and current detecting auxiliary are all individual components,
In addition to crucial inspection streamline circle, sampling chuck and lead-out wire, part that should also be attached including fastening, waterproof etc., to ensure to pacify
Dress is convenient reliable and being capable of long-term use in the wild.
As shown in Fig. 2 being the equivalent resistance schematic diagram in two paths：
Include two most important equivalent resistances in test loop, a resistance is tested steel tower earth resistance Rg, separately
One equivalent resistance Rt produced for remaining steel tower and introductory path collective effect；Current emitter electrode to ground Injection Current,
During returning to signal source from sampling chuck again, one part of current flows through Rg, and another part electric current flows through Rt, if it is possible to survey
Obtain this two parts electric current ig、itThe ratio between ρ=ig/it, the measurement further combined with other parameters can be solving Rg.
As shown in figure 3, being the principle schematic of current ratio detection：
The sine-wave current that electric current sender electrode sends through the sampling chuck of current detecting main part by after Rg, Rt, flowing back to
Signal-processing board, the electric current for flowing through Rg is ig, the electric current for flowing through Rt is it, on the downlead where current detecting main part, have respectively
The upper and lower electric current i for flowing into sampling chucku、id, can also there is electric current i on the downlead where current detecting auxiliarya, but direction
It is uncertain, when lower inspection streamline circle is consistent with inspection streamline circle installation direction, there is ig=id+ia, it=iu-ia；If inspection streamline
The output response of circle is v=ki, and k is constant, then have ig/it=(vd-va)/(vu+va), therefore the output of streamline circle will be examined
Signal is simulated and is added (13), simulates and subtract each other (14) treatment, obtains vd-vaAnd vu+va, each by bandpass filtering all the way
(15,16) and A/D (17,18), sends into signal processor, you can try to achieve ρ=i parallelg/it, complete current ratio and extract.
As shown in figure 4, being the signal flow schematic diagram of voltage ratio extraction：
The sampling chuck that electric current part surveys main part is connected to a sample resistance Rs to signal-processing board publicly, and the ground is also
The ground of signal source, the sampling voltage v that will be obtained by RssWith the voltage v obtained by voltage sampling electrodepRespectively through bandpass filtering
Processed in (15,16) and A/D (17,18) conversion feeding signal processor, obtain δ=vp/vs, complete voltage ratio and extract.
By Rg=Rs (δ -1) [(ρ+1)/ρ], the above-mentioned current ratio ρ and voltage ratio δ for having extracted is substituted into, you can
To obtain a calculated value of earth resistance Rg.
Bandpass filtering and A/D conversion on signal-processing board, parameter is as consistent as possible, to avoid two-way property difference pair
Measurement produces big influence.The measuring circuit of the first two steps is one in the present invention, only by Control break-make come
Reach respective circuit function, it is also possible to synthesize a step using four road bandpass filterings and A/D conversions without switching and complete；
When not measuring, each relay is all to disconnect, and circuit board is disconnected with all aerial lugs, in addition, being added after relay
Piezo-resistance carrys out further protection circuit plate.To improve energy that is anti-interference and improving anti-mutual interference multiple steel towers are measured simultaneously when
Power, above-mentioned measurement process is repeated using multiple random frequencies, a sequence sets of tested steel tower ground resistance is obtained, by Statistics Division
Reason mode obtains the resistance value of tested steel tower final output.
Signal processor can use FPGA, it would however also be possible to employ other types of processor, no matter using any, will
Asking can complete Fourier transformation, the calculating of resistance value and statistical method and obtain final resistance calculations result.
The power line steel tower earth resistance In-circiut tester made using the present invention, can realize power line steel tower ground connection electricity
The on-line testing of resistance, it is not necessary to disconnect down conductor, is that the test of power line steel tower earth resistance is provided convenience.Using electricity
Stream ratio Cleaning Principle is not required the absolute precision of inspection stream Coil Detector, also not influenceed by frequency change, is easy to produce
And debugging.Due to possessing on-line testing function, it is only necessary to related data is sent into server by way of Internet of Things, and is led to
Cross software directly to monitor on computers or on mobile phone, but also can flexibly set as needed and when detect, can replace completely
For the traditional manual inspection mode of power industry, and greatly improve detection efficiency.
The above, specific embodiment only of the invention, any feature disclosed in this specification, except non-specifically
Narration, can alternative features equivalent by other or with similar purpose replaced；Disclosed all features or all sides
Method or during the step of, in addition to mutually exclusive feature and/or step, can be combined in any way.
Claims (4)
- A kind of 1. power line steel tower earth resistance In-circiut tester based on current ratio detection, including current detecting main part (1), Several current detecting auxiliaries (2), electric current sender electrode (3), voltage sampling electrode (4) and signal processing module (5), its feature It is that the current detecting main part (1) is by under top-down one upper inspection streamline circle (6), sampling chuck (7) and one Inspection streamline circle (8) constitute, be installed on any one down conductor of power line steel tower, it is described it is upper inspection streamline circle (6) and under Inspection streamline circle (8) is located on down conductor and noncontact, and the sampling chuck (7) is fixed on and upper inspection is located on down conductor It is held in the middle of streamline circle (6) and lower inspection streamline circle (8) and with down conductor；Described several current detecting auxiliaries (2) It is respectively arranged on power line steel tower remaining down conductor, one, each current detecting auxiliary often is installed with down conductor (2) it is located on down conductor by one and non-contacting inspection streamline circle (9) is constituted；The electric current sender electrode (3) and voltage Sampling electrode (4) is inserted in ground respectively；The signal processing module (5) connects current detecting main part (1), several current detectings Auxiliary (2), electric current sender electrode (3) and voltage sampling electrode (4), for control and data processing.
- 2. the power line steel tower earth resistance In-circiut tester for being detected based on current ratio as described in claim 1, its feature is existed In all coils use identical parameters in the power line steel tower earth resistance In-circiut tester.
- 3. the test side of the power line steel tower earth resistance In-circiut tester for being detected based on current ratio as described in claim 1 Method, comprises the following steps：Step 1, by signal processing module control, upper inspection streamline circle and lower inspection streamline circle, electric current in turn-on current detection main part Detection auxiliary and electric current sender electrode；Signal processing module sends the sine wave of predeterminated frequency by electric current sender electrode to the earth Electric current, measures and upper inspection streamline circle and lower inspection streamline circle in streamline circle and current detecting main part is examined in each current detecting auxiliary Output voltage, voltage v is added to obtain by the inspection stream coil output voltage simulation of several current detecting auxiliariesa, by current detecting master The current detecting main part output voltage v of partdWith voltage vaSimulate to subtract each other and obtain vd-va, by the current detecting master of current detecting main part Part output voltage vuWith voltage vaSimulation addition obtains vu+va, calculating electric current ratio is：ρ=(vd-va)/(vu+va)；Step 2, by signal processing module control, sample chuck, electric current sender electrode and voltage in turn-on current detection main part Sampling electrode, signal processing module, to the earth transmission and the sine-wave current of step 1 same frequency, is surveyed by electric current sender electrode Obtain voltage v at the sampling chuck of current detecting main partsWith the voltage v on voltage sampling electrodep, calculate voltage ratio：δ=vp/ vs；Step 3, signal processing module calculate power line steel tower earth resistance Rg=Rs (δ -1) [(ρ+1)/ρ].
- 4. the test side of the power line steel tower earth resistance In-circiut tester for being detected based on current ratio as described in claim 3 Method, it is characterised in that further comprising the steps of in the method for testing：Repeat step 1 obtains multiple random frequencies to step 3 Under grounding resistance measurement value, constitute an arrangement set, by statistical disposition obtain ground networks resistance value be used as output knot Really.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025561.2A CN106771638B (en) | 2016-11-22 | 2016-11-22 | A kind of power line steel tower ground resistance In-circiut tester based on current ratio detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025561.2A CN106771638B (en) | 2016-11-22 | 2016-11-22 | A kind of power line steel tower ground resistance In-circiut tester based on current ratio detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106771638A true CN106771638A (en) | 2017-05-31 |
| CN106771638B CN106771638B (en) | 2019-10-01 |
Family
ID=58970185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611025561.2A Active CN106771638B (en) | 2016-11-22 | 2016-11-22 | A kind of power line steel tower ground resistance In-circiut tester based on current ratio detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106771638B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015045549A (en) * | 2013-08-28 | 2015-03-12 | 日置電機株式会社 | Ground resistance measurement device, ground resistance measurement method, and ground resistance measurement program |
| 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 |
| CN105467220A (en) * | 2015-11-20 | 2016-04-06 | 国网山东省电力公司电力科学研究院 | Portable grounding resistance tester |
-
2016
- 2016-11-22 CN CN201611025561.2A patent/CN106771638B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015045549A (en) * | 2013-08-28 | 2015-03-12 | 日置電機株式会社 | Ground resistance measurement device, ground resistance measurement method, and ground resistance measurement program |
| 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 |
| CN105467220A (en) * | 2015-11-20 | 2016-04-06 | 国网山东省电力公司电力科学研究院 | Portable grounding resistance tester |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106771638B (en) | 2019-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105954594B (en) | A kind of reverse short distance measurement method and device of Novel connecting ground network ground resistance | |
| CN106569170B (en) | A kind of metering device secondary circuit detector and its detection method | |
| CN103792508A (en) | Error test system and method for digitized metering device | |
| CN104375007B (en) | A kind of soil resistivity measuring method and device based on phase identification | |
| CN108646144A (en) | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system | |
| CN104569671B (en) | A kind of current conversion station grounded screen direct current diverting coefficient method of testing | |
| CN106841815A (en) | A kind of power line steel tower earth resistance In-circiut tester based on voltage drive | |
| CN105911499A (en) | Ultrasonically local discharging metering system under onsite environment and method | |
| CN105891604B (en) | A kind of circuit impedance method and test macro measuring transmission tower impedance ground | |
| CN106526526A (en) | Test device for digital metering system | |
| CN105510859A (en) | System and method for evaluating electronic transformer | |
| CN202305785U (en) | Calibrating device based on tracing technology for 0.05-level DC electric energy meter | |
| CN100543491C (en) | The accuracy test macro of electric energy meter electrical fast transient (eft) interference test | |
| CN205539205U (en) | Measure transmission tower earth impedance's return circuit impedance test system | |
| CN205720417U (en) | A kind of triple channel contactless below 1000V voltage measuring apparatus | |
| CN108802498A (en) | A kind of earth resistance tester | |
| CN103018525A (en) | Synchronous measurement device and method of short-circuit current distribution in transformer substation | |
| CN109470929A (en) | Real-time earthing lightning protection monitoring system and monitoring method based on Internet of Things | |
| CN106054093B (en) | A kind of anti-Hz noise capability evaluation device of earthing or grounding means tester | |
| CN112363017A (en) | Line fault positioning method based on wavelet transformation | |
| CN207908626U (en) | A kind of simulation high frequency Partial discharge signal generating means | |
| CN106771638B (en) | A kind of power line steel tower ground resistance In-circiut tester based on current ratio detection | |
| CN201344954Y (en) | Special digital earth resistance online measuring device of electrified railway system | |
| CN206618805U (en) | A kind of super-huge Grounding impedance measurement device | |
| CN206990679U (en) | A kind of power line steel tower grounding resistance In-circiut tester based on voltage drive |
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 |