CN105891606A - Device for testing tower grounding resistance through disassembly-free ground lead - Google Patents

Device for testing tower grounding resistance through disassembly-free ground lead Download PDF

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Publication number
CN105891606A
CN105891606A CN201610478021.3A CN201610478021A CN105891606A CN 105891606 A CN105891606 A CN 105891606A CN 201610478021 A CN201610478021 A CN 201610478021A CN 105891606 A CN105891606 A CN 105891606A
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CN
China
Prior art keywords
pole
voltage
current
electric current
point
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Application number
CN201610478021.3A
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Chinese (zh)
Inventor
李映清
张顶山
崔慧明
王彦彪
张丹灵
夏玉山
肖克芳
李永清
陈振勇
李国生
王关霖
吴正功
Original Assignee
国网甘肃省电力公司白银供电公司
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Application filed by 国网甘肃省电力公司白银供电公司 filed Critical 国网甘肃省电力公司白银供电公司
Priority to CN201610478021.3A priority Critical patent/CN105891606A/en
Publication of CN105891606A publication Critical patent/CN105891606A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates

Abstract

The invention relates to a device for testing tower grounding resistance through a disassembly-free ground lead. The device is mainly composed of a CPU control unit, a power supply module, a display screen, an inverter variable-frequency power source, a voltage and current sampling circuit, a current electrode injection point, a reference voltage electrode, a reference point and a wiring terminal. Four Rogowski coil current transformers are clamped on down conductors at four corners of the tower, abnormal frequency current is injected between the current electrode and the iron tower, and the grounding resistance value of the iron tower is calculated by program software. According to the device for testing tower grounding resistance, the tower grounding resistance can be tested without disassembling the tower down conductors and the tower body connection points, and the device has the advantages that the wiring is simple, the operation is convenient, the labor intensity is reduced, the tower grounding resistance testing efficiency of the line can be improved by 2 times or higher, and the maintenance cost is reduced by 50% or higher per year.

Description

Exempt from the device of dismounting ground wire test steel tower earth resistance
Technical field
The invention belongs to power test technology, specifically, be the test dress of the steel tower earth resistance of transmission line of electricity Put.
Background technology
The grounding resistance size of iron tower of power transmission line, to line thunder protection whether function, has important references It is worth, is to judge the important evidence that steel tower ground connection is the best.Grounding resistance is little, can reduce counterattack tripping operation Rate, improves the anti-thunder level of steel tower.
Iron tower of power transmission line has four feet, for ensureing that the earth resistance of steel tower meets transmission line of electricity operating standard and wants Ask, at four column foots of steel tower, have down conductor to be connected with Manual earth network.Described Manual earth network, is to put The grounded screen that penetrating property ground connection polar net or annular earthing pole are constituted.
When periodicity measurement circuit steel tower earth resistance, due to foundation soil sedimentation and welding quality reason, When removing down conductor with tower body junction point, because by External Force Acting, often resulting in down conductor and bury If earthing pole or ring grounded screen sealing-off, or remove be completed after situation about cannot recover, this meeting occur Transmission line of electricity lightning protection is caused bigger potential safety hazard.
Traditional three electrode method or split-core type meter method test earth resistance, except needs are by grounded screen and each column foot of steel tower Junction point open outside, run into radial pattern earthing pole constitute grounded screen time, in addition it is also necessary to by four radiation After earthing pole and tower body disconnect, more just can test after all connecting with wire, so, labor intensity is big, Testing efficiency is low.
Summary of the invention
For improving line steel tower earth resistance efficiency, it is an object of the invention to: provide one to exempt to disconnect The device of ground wire test steel tower earth resistance.
The present invention is achieved in that
This exempts from the test steel tower ground resistance apparatus of dismounting ground wire, mainly by CPU control unit 1, power supply Module 2, display screen 3, keyboard 4, inversion changing frequency power supply 5, voltage x current sample circuit 6, electric current pole are injected Point 7, reference voltage pole 8, reference point 9, electric current pole C1, voltage pole P1, voltage pole P2, electric current pole C2 Binding post 14-17, Luo-coil current transformer 18 form.
Described CPU control unit 1, with power supply module 2, display screen 3, keyboard 4, inversion changing frequency power supply 5 and voltage x current sample circuit 6 connect;
Described power supply module 2, is made up of rectification circuit and lithium battery, and its prime is 220V alternating current, should The rectified circuit of alternating current is converted into unidirectional current, for lithium cell charging, lithium battery be CPU control unit 1 and Inversion changing frequency power supply 5 is powered.This inversion changing frequency power supply 5 simultaneously with the lithium battery of power supply module 2 and whole Current circuit outfan is connected, and is alternating current power supply---the frequency of alternating current that test environment needs by DC conversion For 45Hz, controlled frequency and the amplitude of voltage signal by CPU control unit 1.
Described electric current pole C1 is connected with inversion changing frequency power supply 5 and electric current pole decanting point 7, is injected by electric current pole Point injects 45Hz non-power-frequency current;Described current stage C2 is connected, as shaft tower with the tower body reference point 9 of shaft tower Current reference point.
The size of described voltage pole P1 output voltage is by Single-chip Controlling, and its magnitude of voltage is joined corresponding to voltage sample The alien frequencies voltage of examination point 8;Described voltage pole P2 is connected with the tower body reference point 9 of shaft tower, as the electricity of shaft tower Pressure reference point.
Described Luo-coil current transformer 18, it is connected with four binding posts respectively, former according to electromagnetic induction Reason is to steel tower column foot down conductor current sample.
Described reference point 9, is connected on steel tower pylon, as zero-potential point.
Described electric current pole decanting point 7 and reference voltage pole 8, require (straight line 0.618 or 30 ° according to three electrode method Angle-off set) reference point is set.
Described voltage x current sample circuit 6, by the inflow earth current collected and magnitude of voltage, controls for CPU Unit 1 processed provides initial data;
The alien frequencies signal applied is controlled, samples, calculates by CPU1 and voltage x current sample circuit 6, and it controls Instruction is inputted by keyboard 4, and result relies on LCDs 7 to export.
The present invention uses alien frequencies Anti-Jamming Technique, injects non-power-frequency current at steel tower tower body and far-end electric current pole, uses The Luo-coil current transformer of open type clamps on steel tower down conductor, to measure each column foot grounding lead The non-power-frequency current rolled off the production line;Voltage and current signal for measuring synchronizes to carry out sampling and digital filtering respectively Remove power frequency 50Hz and high-frequency interferencing signal;By measurement apparatus, electric current, voltage signal are made spectrum analysis, Fundametal compoment therein is separated, uses ohm law computational methods, obtain the ground connection electricity of tested steel tower Resistance.
The invention has the beneficial effects as follows:
The device of the test steel tower earth resistance of the present invention, during on-the-spot test, can simplify and remove down conductor Hard work, its beneficial effect:
(1) avoid steel tower down conductor and cannot be carried out test because not opening.
(2) situation avoiding earthing pole to cause down conductor cannot recover after tearing open due to soil settlement is sent out Raw.
(3) measuring scope wide, resolution is high.
(4) save the testing time, save testing cost.
The present invention exempts from dismounting ground wire test steel tower ground resistance apparatus, has wiring simple, simple operation, Reduce labor intensity, line steel tower earth resistance efficiency can be improved more than 2 times, within 1 year, maintenance can be saved Cost more than 50%.
Below in conjunction with the accompanying drawings and embodiment, the present invention will be further described.
Accompanying drawing explanation
Fig. 1. the test philosophy block diagram of the present invention
Detailed description of the invention
A kind of new device testing steel tower earth resistance of embodiment
The block diagram of Fig. 1 shows the test philosophy of embodiment of the present invention test steel tower earth resistance
In figure: 1 be CPU control unit, 2 be power supply module, 3 be display screen, 4 be keyboard, 5 be Inversion changing frequency power supply, 6 be voltage x current sample circuit, 7 be electric current pole decanting point, 8 be reference voltage pole, 9 Be reference point, 10-17 be binding post: its middle connecting terminal 10,13 is respectively electric current pole C1, C2;Connect Line terminals 11,12 is respectively voltage pole P1, P2;Binding post 14-17 be respectively RCT-1, RCT-2, RCT-3, RCT-4, which is connected Luo-coil current transformer 18.
CPU control unit 1, with power supply module 2, display screen 3, keyboard 4, inversion changing frequency power supply 5 and Voltage x current sample circuit 6 connects;
Power supply module 2, is made up of rectification circuit and lithium battery, and its prime is 220V alternating current, this exchange The rectified circuit of electricity is converted into unidirectional current, and for lithium cell charging, lithium battery is CPU control unit 1 and inversion Variable-frequency power sources 5 is powered;This inversion changing frequency power supply 5, its simultaneously with lithium battery and the rectification of power supply module 2 Circuit output end is connected, and is the alternating current power supply that test environment needs by DC conversion, and the frequency of alternating current is 45Hz, controls frequency and the amplitude of voltage signal by CPU control unit 1;Electric current pole C1 described in voltage pole, It is connected with inversion changing frequency power module 5 and electric current pole decanting point 7, injects 45Hz by electric current pole decanting point 7 Non-power-frequency current;Described electric current pole C2, it is connected with the tower body reference point 9 of shaft tower, as the current reference of shaft tower Point.
Described voltage pole P1, the size of its output voltage is by Single-chip Controlling, and its magnitude of voltage corresponds to voltage sample The alien frequencies voltage of reference point 8;Described voltage pole P2 is connected, as shaft tower with the tower body reference point 9 of shaft tower Voltage reference points.
Luo-coil current transformer 18, adopts steel tower column foot down conductor electric current according to electromagnetic induction principle Sample;The alien frequencies signal applied is controlled, samples, calculates by CPU and sample circuit, and its control instruction is by keyboard 4 Input, result relies on LCDs 3 to export.
Voltage x current sample circuit 6, by the inflow earth current collected and magnitude of voltage, controls single for CPU Unit 1 provides initial data.
Reference point 9, is connected on steel tower pylon, as zero-potential point;
Display screen 3, is used for exporting measurement data;
Keyboard 4, for setting and the display of input signal source operational measure device;
Electric current pole decanting point 7 and reference voltage pole 8, require (straight line 0.618 or 30 ° of angles according to three electrode method Method) reference point 9 is set.
In the whole earthed system of steel tower, test device injection current, through the earth, steel tower grounded screen Network, test device constitute loop.
In test site, installation and the computational methods of the present embodiment are as follows:
1) require that (straight line 0.618 or 30 ° of angle-off sets) arrange electric current pole and voltage pole according to three electrode method;
2) optional position selecting tower body is reference point 9, and electric current pole C2, voltage pole P2 are received reference point 9 On;
3) decanting point 7 of electric current pole is inserted in the ground of 3~4d away from column foot maximum diagonal distance (d), It is connected by wire mouth C1 extreme with the electric current of device;
4) voltage pole reference point, 30 ° of angle-off sets of foundation-be inserted in electric current pole decanting point away from 1 times of left side of steel tower distance In right ground, electric current line becomes more than 30 ° angles with pressure-wire, by the voltage pole port of wire Yu measuring instrument P1 connects;
5) use 4 Luo-coil current transformers, clamp respectively at 4 column foot down conductors of steel tower, The other end is connected with tester RCT-1, RCT-2, RCT-3, RCT-4;
6) electric current pole C1 is injected the electric current Is (45Hz) of fixed frequency by mutation variable-frequency power sources 5;
7) test device gathers electric current and the reference of tested four column foot down conductors of column foot Magnitude of voltage US
8) each column foot impedance ground Z is calculated respectively according to Ohm's lawA、ZB、ZC、ZD, then calculate steel tower ground connection Resistance value RE=1/ (1/ZA+1/ZB+1/ZC+1/ZD), REIt is column foot grounding resistance.

Claims (5)

1. exempt from the device of dismounting ground wire test steel tower earth resistance, it is characterised in that: main by CPU control unit (1), power supply module (2), display screen (3), keyboard (4), inversion changing frequency power supply (5), voltage x current are adopted Sample circuit (6), electric current pole decanting point (7), reference voltage pole (8), reference point (9), electric current pole C1 (10), Voltage pole P1 (11), voltage pole P2 (12), electric current pole C2 (13), binding post, Luo-coil Current Mutual Inductance Device (18) forms;
Described CPU control unit (1), becomes with power supply module (2), display screen (3), keyboard (4), inversion Frequency power (5) and voltage x current sample circuit (6) connect;
Described electric current pole C1 (10) is connected with inversion changing frequency power module (5) and electric current pole decanting point (7), logical 45Hz non-power-frequency current is injected in overcurrent pole decanting point (7);Electric current pole C2 (13) and the tower body reference point of shaft tower (9) it is connected, as the current reference point of shaft tower;
The size of described voltage pole P1 (11) output voltage is by Single-chip Controlling, and its magnitude of voltage corresponds to voltage The alien frequencies voltage of sample reference point (8);Voltage pole P2 (12) is connected with shaft tower tower body reference point (9), as The voltage reference points of shaft tower.
Described Luo-coil current transformer (18), its respectively with electric current pole C1 (10), voltage pole P1 (11), Voltage pole P2 (12), the binding post of electric current pole C2 (13) connect, according to electromagnetic induction principle to steel tower Column foot down conductor current sample;
Described reference point (9), is connected on steel tower pylon, as zero-potential point;
Described electric current pole decanting point (7) and reference voltage pole (8), require to arrange reference point according to three electrode method;
Described voltage x current sample circuit (6), by the inflow earth current collected and magnitude of voltage, for CPU Control unit (1) provides initial data.
Test the device of steel tower earth resistance the most according to claim 1, it is characterised in that: described power supply Power module (2), is made up of rectification circuit and lithium battery, and its prime is 220V alternating current, and alternating current is rectified Circuit is converted into unidirectional current, for lithium cell charging;Lithium battery is CPU control unit (1) and inversion changing frequency power supply (5) power supply.
Test the device of steel tower earth resistance the most according to claim 1, it is characterised in that: described inversion Variable-frequency power sources (5), is connected, by direct current with lithium battery and the rectification circuit output end of power supply module (2) simultaneously Electricity is converted into the alternating current power supply that test environment needs, and the frequency of alternating current is 45Hz, by CPU control unit (1) Control frequency and the amplitude of voltage signal.
Test the device of steel tower earth resistance the most according to claim 1, it is characterised in that: described Roche Coil current transformer (18), use opening-closing structure, coil soft pliable, can in small space free shuttling.
5. exempt from the using method of the device of dismounting ground wire test steel tower earth resistance: it is characterized in that, according to following step Rapid method is carried out:
1) according to three electrode method requirement-straight line 0.618 or 30 ° of angle-off sets, electric current pole C1 (10) and voltage are arranged Pole P1 (11);
2) optional position selecting tower body is reference point (9), electric current pole C2 (13), voltage pole P2 (12) is connect In reference point (9);
3) electric current pole decanting point is inserted in the ground of 3~4d away from column foot maximum diagonal distance (d), logical Cross wire mouth extreme with the electric current of device C1 (10) to be connected;
4) voltage pole reference point 8,30 ° of angle-off sets of foundation-be inserted in electric current pole decanting point (7) away from steel tower distance In the ground of about 1 times, electric current line becomes more than 30 ° angles with pressure-wire, by the voltage of wire Yu measuring instrument Extreme mouth P1 (11) connects;
5) use 4 Luo-coil current transformers, clamp respectively at 4 column foot down conductors of steel tower, The other end respectively with tester electric current pole C1 (10), voltage pole P1 (11), voltage pole P2 (12), electricity Binding post RCT-1, RCT-2, RCT-3, RCT-4 of stream pole C2 (13) is connected;
6) the electric current Is that electric current pole (C1) is injected fixed frequency by mutation variable-frequency power sources (5) is 45Hz;
7) test device gathers electric current and the reference of tested four column foot down conductors of column foot Magnitude of voltage US
8) each column foot impedance ground Z is calculated respectively according to Ohm's lawA、ZB、ZC、ZD, then calculate steel tower ground connection Resistance value RE=1/ (1/ZA+1/ZB+1/ZC+1/ZD), REIt is column foot grounding resistance.
CN201610478021.3A 2016-06-27 2016-06-27 Device for testing tower grounding resistance through disassembly-free ground lead CN105891606A (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system
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
CN107490725A (en) * 2017-08-04 2017-12-19 上海建科检验有限公司 The pole method of testing of special industry place grounding resistance three
CN107656144A (en) * 2017-11-14 2018-02-02 国网山东省电力公司电力科学研究院 A kind of comprehensive detection system and method for transmission line of electricity earthed system
CN109188538A (en) * 2018-09-27 2019-01-11 国网山西省电力公司电力科学研究院 Goaf electromechanical detection method under a kind of column foot

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CN104569609A (en) * 2015-01-04 2015-04-29 云南电网有限责任公司电力科学研究院 Tower grounding impedance testing method for measuring abnormal frequency current of down leads
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

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JP2007163139A (en) * 2005-12-09 2007-06-28 Tokyo Electric Power Co Inc:The Earth resistance management method
CN1828313A (en) * 2006-02-21 2006-09-06 武汉高压研究所 Pole tower earthing resistance quick testing method without unfastening wire and device
CN201780335U (en) * 2010-01-04 2011-03-30 广东电网公司广州供电局 Ground resistance detecting device of overhead transmission line pole tower
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system
CN106680632B (en) * 2016-12-30 2021-01-08 杭州后博科技有限公司 Iron tower lightning protection performance detection method and system based on electromagnetic radiation abnormity judgment
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
CN107490725A (en) * 2017-08-04 2017-12-19 上海建科检验有限公司 The pole method of testing of special industry place grounding resistance three
CN107656144A (en) * 2017-11-14 2018-02-02 国网山东省电力公司电力科学研究院 A kind of comprehensive detection system and method for transmission line of electricity earthed system
CN109188538A (en) * 2018-09-27 2019-01-11 国网山西省电力公司电力科学研究院 Goaf electromechanical detection method under a kind of column foot

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