CN104535844A - Method for testing grounding resistance of tower by using disassembly-free down conductor - Google Patents
Method for testing grounding resistance of tower by using disassembly-free down conductor Download PDFInfo
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- CN104535844A CN104535844A CN201510027899.0A CN201510027899A CN104535844A CN 104535844 A CN104535844 A CN 104535844A CN 201510027899 A CN201510027899 A CN 201510027899A CN 104535844 A CN104535844 A CN 104535844A
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Abstract
The invention provides a method for testing the grounding resistance of an overhead transmission line tower by using a disassembly-free down conductor. The method comprises a measuring device, a measuring electrode and a current sensor, wherein the measuring electrode and the current sensor are connected with the measuring device; the current sensor is coiled at down conductors at legs of a to-be-tested tower; the measuring device is used for outputting pilot-frequency sine-wave power supply to the to-be-tested tower; the current sensor is used for sending detected earth current to the measuring device; the measuring device is used for acquiring a fundamental component according to the earth current and the potential difference of base potentials of the measuring electrode and the to-be-tested tower, and then calculating the grounding resistance value of the to-be-tested tower according to the acquired fundamental component. According to the testing method disclosed by the invention, the interference resistance is high and the measurement is accurate. The device mainly comprises a pilot-frequency power supply which is used for providing testing current through a chargeable lithium battery, a current and voltage measuring circuit and a microcomputer measurement and control system.
Description
Technical field
The present invention relates to and a kind ofly do not remove the method that tower grounding downlead just can test pole tower ground resistance, belong to electric power application.
Background technology
The stake resistance of power transmission sequence shaft tower weighs the whether good standard of tower grounding, and grounding resistance is little can reduce counterattack trip-out rate, improves the anti-thunder level of shaft tower, has Great significance to line thunder protection.
In the past, pole tower ground resistance measurement method had two kinds: three electrode method, split-core type meter method.Three electrode method or split-core type meter method is adopted to measure the process of pole tower ground resistance as shown in Figure 1.
As can be seen from process flow diagram, when adopting three electrode method or split-core type meter method to measure pole tower ground resistance, the down conductor of shaft tower before test, must be opened, also need after test to recover down conductor.
As shown in Figure 2, shaft tower generally has 4 pin, namely 4 down conductors are had, the A point of down conductor is place's tie point, for avoiding theft or corrosion etc., only have small part to take screw to connect, and major part is taked directly " to be welded ", disconnecting " A " point so just needs the aid such as electric saw, electric welding machine to complete fast.These all bring difficulty to test job, because the shaft tower major part of transmission line of electricity is erected on the rugged high mountain be difficult to walk, electric welding machine, cutting machine, power supply are transported on mountain very difficult, cause the operational difficulties disconnecting and repair down conductor, cause some stake resistance to test.
In a word, three electrode method or split-core type meter method is adopted all to need to disconnect and repair down conductor.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, study a kind of exempting from and tear the method that down conductor just can test pole tower ground resistance open, solve in prior art the problem needing to disconnect and repair down conductor when testing pole tower ground resistance.The present invention can when not untiing down conductor, easily and fast, accurately test there is single, two and above down conductor overhead line structures grounding resistance, increase work efficiency and reduce testing cost.
Method of testing of the present invention comprises the broadband Rogowsky coil current sensor of measurement mechanism, the potential electrode be connected with described measurement mechanism and open type; The column foot down conductor that the broadband Rogowsky coil current sensor of described open type is wrapped in shaft tower to be measured sentences the earth current detecting shaft tower column foot to be measured; Described measurement mechanism exports alien frequencies sine-wave power to shaft tower to be measured; The broadband Rogowsky coil current sensor of described open type sends the earth current detected to measurement mechanism; Described measurement mechanism obtains fundametal compoment according to the potential difference (PD) of described earth current and described potential electrode and pole and tower foundation current potential to be measured, and the frequency of this fundametal compoment is identical with the frequency of the sine-wave current that described measurement mechanism exports; Described measurement mechanism calculates pole tower ground resistance value to be measured according to the fundametal compoment obtained again.
Described electrode by three electrode method requirement, i.e. straight line 0.618 or 30 ° of angle-off set arrange current poles and voltage pole.
Described electrode is the rod iron of the long 50cm of every root, diameter 2cm.
The distance of described insertion point, electric current pole distance column foot is 3 ~ 4 times of column foot maximum diagonal distance.
Described voltage pole insertion position is: voltage pole is inserted in the ground of electric current pole span shaft tower distance 0.618 times; Or voltage pole is inserted in the ground of electric current pole span shaft tower distance 1 times, current line becomes 30 ° of angles with pressure-wire.
Described broadband Rogowsky coil current sensor is 4, is placed on 4 column foot down conductor places of shaft tower respectively.
Described broadband Rogowsky coil current sensor, with wire diameter be 1.0mm enamel covered wire evenly close around diameter be 2cm, solenoid that the non-magnet material skeleton of length 150cm is formed, installing the solenoid being wound around upper enamel covered wire additional screen layer is again filled in the silica gel hose that internal diameter is 1.5 ~ 2cm, and the internal diameter of whole coil is 3.2cm, enamel covered wire coil turn is 25000 circles.
Advantageous effect of the present invention is as follows:
Adopt the above-mentioned new method of not tearing down conductor test pole tower ground resistance open, greatly can simplify the hard work that on-the-spot test in the past needs to remove down conductor.
(1) need not tear/recover tower grounding downlead open, thus save time.
(2) can avoid earthing pole due to soil settlement cause down conductor to be torn open after cannot recover.
(3) downlead because unloading process causes is avoided and earthing pole pad ruptures.
(4) generation due to earthing pole elastic force casualty accident when dismantling earthing pole is avoided.
(5) use manpower and material resources sparingly, save testing cost.
Accompanying drawing explanation
Fig. 1 is the process flow diagram adopting three electrode method or split-core type meter method to measure pole tower ground resistance in prior art.
Fig. 2 is the on-the-spot schematic diagram of shaft tower.
Fig. 3 is that the present invention exempts to tear down conductor test pole tower ground resistance wiring schematic diagram open.
In figure, 1, shaft tower, 2, down conductor; 3, tester, 4, broadband Rogowsky coil, 5, insertion point, electric current pole, 6, voltage pole insertion point.
Embodiment
Embodiment
Method of testing of the present invention comprises the broadband Rogowsky coil current sensor of measurement mechanism, the potential electrode be connected with described measurement mechanism and open type; The column foot down conductor that the broadband Rogowsky coil current sensor of described open type is wrapped in shaft tower to be measured sentences the earth current detecting shaft tower column foot to be measured; Described measurement mechanism exports alien frequencies sine-wave power to shaft tower to be measured; The broadband Rogowsky coil current sensor of described open type sends the earth current detected to measurement mechanism; Described measurement mechanism obtains fundametal compoment according to the potential difference (PD) of described earth current and described potential electrode and pole and tower foundation current potential to be measured, and the frequency of this fundametal compoment is identical with the frequency of the sine-wave current that described measurement mechanism exports; Described measurement mechanism calculates pole tower ground resistance value to be measured according to the fundametal compoment obtained again.
As shown in Figure 3, require (straight line 0.618 or 30 ° of angle-off sets) arrange current pole and voltage pole according to three electrode method, the optional position selecting tower body four tower angles is reference point, receives on reference point G by C2, P2 terminal of tester, C1 terminal connects electric current pole, and P1 terminal connects voltage pole.The long rod iron for 50cm, diameter 2cm of every root electrode, the distance of C insertion point, electric current pole distance column foot is 3 ~ 4 times of column foot maximum diagonal distance, is connected by the extreme mouth C1 of wire and the electric current of tester.Voltage pole P insertion position: straight line 0.618 method-voltage pole P is inserted in electric current pole C apart from the ground of shaft tower distance 0. 618 times; 30 ° of angle-off set-voltage pole P are inserted in electric current pole C apart from the ground of shaft tower distance about 1 times, and current line becomes 30 ° of angles with pressure-wire; Be connected with the voltage pole port P1 of measurement mechanism by wire.Use 4 high precision broad frequency Rogowsky coil current sensors, be placed on 4 column foot down conductor places of shaft tower respectively.
High precision broad frequency Rogowsky coil current sensor, with wire diameter be 1.0mm enamel covered wire evenly close around diameter be 2cm, solenoid that the non-magnet material skeleton of length 150cm is formed, installing the solenoid being wound around upper enamel covered wire additional screen layer is again filled in the silica gel hose that internal diameter is 1.5 ~ 2cm, the internal diameter of whole coil is 3.2cm, enamel covered wire coil turn is about 25000 circles, and 4 sensors are connected with the sensor input port RCT on measuring instrument respectively by drawing concentric cable outside integrator.
Alien frequencies frequency power injects the electric current I s(45Hz of fixed frequency to electric current pole C1).In the whole earthed system of shaft tower, proving installation injection total current Σ i (1+3+5+......) and Σ i (2+4+6+......) return through adjacent column foot aerial earth wire and tower grounding net, and proving installation only gathers Fundamental-frequency Current and the fundamental frequency reference voltage level U of tested column foot four column foot down conductors
s, calculate each tower corner-of-delta grounding impedance Z respectively
a, Z
b, Z
c, Z
d, then calculate pole tower ground resistance value R
e=1/(1/Z
a+ 1/Z
b+ 1/Z
c+ 1/Z
d) be column foot grounding resistance.
The method Selection utilization alien frequencies Anti-Jamming Technique, in conjunction with traditional V.A. method and split-core type meter method measuring principle, non-power-frequency current is injected to shaft tower and electric current pole, the broadband Rogowsky coil of open type is used to be wrapped in non-power-frequency current tower grounding downlead being measured each tower corner-of-delta grounding downlead, for the voltage U measured
sand electric current I
s(I
a+ I
b+ I
c+ I
d) signal samples respectively, and carry out dispersion Fourier expansion and digital filtering, remove power frequency and high-frequency interferencing signal, different-frequency measure signal is only allowed to pass through, by measurement mechanism, spectrum analysis is done to electric current, voltage signal, fundametal compoment is wherein separated, adopts ohm law computing method to obtain the stake resistance of tested shaft tower.
The present invention is when certain line earth resistance.Circuit is positioned at mountain area, because do not need to disconnect aerial earth wire and down conductor, only four Rogowsky coil current sensors need be enclosed within the down conductor of steel tower feet, test job 3 people are completed for 9 days, the former test needs of power of the test 100%(3 people complete for 16 days, power of the test 90%), work efficiency improves 25%.Use the method for not tearing down conductor test pole tower ground resistance open, measurement range is wide, resolution is high, test figure is accurate.
Method of testing antijamming capability of the present invention is strong, measures accurately.This device provides the alien frequencies power supply of measuring current, electric current and tension measuring circuit and micro computer TT&C system to form primarily of rechargeable lithium battary.
This device adopts alien frequencies Anti-Jamming Technique, can under strong interference environment the stake resistance of accurate and easily real-time testing earthing device, and there is the reliable and stable and time saving and energy saving feature of test result.Therefore this system has promotional value and application prospect widely.
Claims (7)
1. exempt from a method of tearing down conductor test pole tower ground resistance open, it is characterized in that the broadband Rogowsky coil current sensor comprising measurement mechanism, the potential electrode be connected with described measurement mechanism and open type; The column foot down conductor that the broadband Rogowsky coil current sensor of described open type is wrapped in shaft tower to be measured sentences the earth current detecting shaft tower column foot to be measured; Described measurement mechanism exports alien frequencies sine-wave power to shaft tower to be measured; The broadband Rogowsky coil current sensor of described open type sends the earth current detected to measurement mechanism; Described measurement mechanism obtains fundametal compoment according to the potential difference (PD) of described earth current and described potential electrode and pole and tower foundation current potential to be measured, and the frequency of this fundametal compoment is identical with the frequency of the sine-wave current that described measurement mechanism exports; Described measurement mechanism calculates pole tower ground resistance value to be measured according to the fundametal compoment obtained again.
2. a kind of method exempting to tear open down conductor test pole tower ground resistance according to claim 1, is characterized in that described electrode is by three electrode method requirement, i.e. straight line 0.618 or 30 ° of angle-off set arrange current poles and voltage pole.
3. a kind of exempting from according to claim 1 tears the method that down conductor tests pole tower ground resistance open, it is characterized in that described electrode is the rod iron of the long 50cm of every root, diameter 2cm.
4. a kind of exempting from according to claim 2 tears the method that down conductor tests pole tower ground resistance open, it is characterized in that the distance of described insertion point, electric current pole distance column foot is 3 ~ 4 times of column foot maximum diagonal distance.
5. a kind of exempting from according to claim 2 tears the method that down conductor tests pole tower ground resistance open, it is characterized in that described voltage pole insertion position is: voltage pole is inserted in the ground of electric current pole span shaft tower distance 0.618 times; Or voltage pole is inserted in the ground of electric current pole span shaft tower distance 1 times, current line becomes 30 ° of angles with pressure-wire.
6. a kind of exempting from according to claim 1 tears the method that down conductor tests pole tower ground resistance open, it is characterized in that described broadband Rogowsky coil current sensor is 4, is placed on 4 column foot down conductor places of shaft tower respectively.
7. a kind of exempting from according to claim 1 tears the method that down conductor tests pole tower ground resistance open, it is characterized in that described broadband Rogowsky coil current sensor, with wire diameter be 1.0mm enamel covered wire evenly close around diameter be 2cm, solenoid that the non-magnet material skeleton of length 150cm is formed, installing the solenoid being wound around upper enamel covered wire additional screen layer is again filled in the silica gel hose that internal diameter is 1.5 ~ 2cm, and the internal diameter of whole coil is 3.2cm, enamel covered wire coil turn is 25000 circles.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021897A (en) * | 2015-08-17 | 2015-11-04 | 国网辽宁省电力有限公司抚顺供电公司 | Tower grounding resistance measurement apparatus without dismounting of grounding down lead, and measurement method thereof |
| CN105891606A (en) * | 2016-06-27 | 2016-08-24 | 国网甘肃省电力公司白银供电公司 | Device for testing tower grounding resistance through disassembly-free ground lead |
| CN105891604A (en) * | 2016-04-11 | 2016-08-24 | 国网安徽省电力公司电力科学研究院 | Loop impedance method of measuring power transmission support grounding impedance and testing system |
| CN106093588A (en) * | 2016-07-07 | 2016-11-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current grounding pole earth resistance accurate measuring systems and method |
| CN106093589A (en) * | 2016-08-09 | 2016-11-09 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
| CN106597113A (en) * | 2016-11-22 | 2017-04-26 | 电子科技大学 | Power line tower grounding resistance online tester based on proportion detection |
| CN107219405A (en) * | 2017-05-26 | 2017-09-29 | 云南电网有限责任公司电力科学研究院 | A kind of electric power line pole tower tower leg basis and grounding resistance of transmission method of testing |
| CN107271760A (en) * | 2017-05-28 | 2017-10-20 | 西南交通大学 | Power-frequency voltage bipolar plates assessment device and method in ground |
| CN107505508A (en) * | 2017-09-09 | 2017-12-22 | 广西电网有限责任公司电力科学研究院 | A kind of pole tower ground resistance measurement apparatus |
| CN109030951A (en) * | 2018-08-27 | 2018-12-18 | 云南电网有限责任公司电力科学研究院 | A kind of on-line measurement system and method for shared electric power tower ground resistance |
| CN109374976A (en) * | 2018-10-19 | 2019-02-22 | 中国人民解放军空军勤务学院 | A kind of online ground resistance Fast measurement system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021897A (en) * | 2015-08-17 | 2015-11-04 | 国网辽宁省电力有限公司抚顺供电公司 | Tower grounding resistance measurement apparatus without dismounting of grounding down lead, and measurement method thereof |
| CN105891604B (en) * | 2016-04-11 | 2019-05-31 | 国网安徽省电力公司电力科学研究院 | A kind of circuit impedance method and test macro measuring transmission tower impedance ground |
| CN105891604A (en) * | 2016-04-11 | 2016-08-24 | 国网安徽省电力公司电力科学研究院 | Loop impedance method of measuring power transmission support grounding impedance and testing system |
| CN105891606A (en) * | 2016-06-27 | 2016-08-24 | 国网甘肃省电力公司白银供电公司 | Device for testing tower grounding resistance through disassembly-free ground lead |
| CN106093588A (en) * | 2016-07-07 | 2016-11-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current grounding pole earth resistance accurate measuring systems and method |
| CN106093589A (en) * | 2016-08-09 | 2016-11-09 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
| CN106093589B (en) * | 2016-08-09 | 2018-09-18 | 国网重庆市电力公司南岸供电分公司 | A kind of pole tower ground resistance Accurate measurement and device |
| CN106597113A (en) * | 2016-11-22 | 2017-04-26 | 电子科技大学 | Power line tower grounding resistance online tester based on proportion detection |
| CN106597113B (en) * | 2016-11-22 | 2019-12-10 | 电子科技大学 | Power line iron tower ground resistance on-line tester based on proportion detection |
| CN107219405A (en) * | 2017-05-26 | 2017-09-29 | 云南电网有限责任公司电力科学研究院 | A kind of electric power line pole tower tower leg basis and grounding resistance of transmission method of testing |
| CN107219405B (en) * | 2017-05-26 | 2019-10-01 | 云南电网有限责任公司电力科学研究院 | A kind of electric power line pole tower tower leg basis and grounding resistance of transmission test method |
| CN107271760A (en) * | 2017-05-28 | 2017-10-20 | 西南交通大学 | Power-frequency voltage bipolar plates assessment device and method in ground |
| CN107271760B (en) * | 2017-05-28 | 2019-12-10 | 西南交通大学 | Device and method for evaluating underground power frequency voltage bipolar plate |
| CN107505508A (en) * | 2017-09-09 | 2017-12-22 | 广西电网有限责任公司电力科学研究院 | A kind of pole tower ground resistance measurement apparatus |
| CN109030951A (en) * | 2018-08-27 | 2018-12-18 | 云南电网有限责任公司电力科学研究院 | A kind of on-line measurement system and method for shared electric power tower ground resistance |
| CN109374976A (en) * | 2018-10-19 | 2019-02-22 | 中国人民解放军空军勤务学院 | A kind of online ground resistance Fast measurement system |
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Application publication date: 20150422 |