CN1158425A - Release-free electric cable tower ground resistance testing method and device - Google Patents
Release-free electric cable tower ground resistance testing method and device Download PDFInfo
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- CN1158425A CN1158425A CN 96120774 CN96120774A CN1158425A CN 1158425 A CN1158425 A CN 1158425A CN 96120774 CN96120774 CN 96120774 CN 96120774 A CN96120774 A CN 96120774A CN 1158425 A CN1158425 A CN 1158425A
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Abstract
A method for measuring the grounding resistance of power transmission tower without opening its grounding line features use of tong-test transformer to clip mor grounding lines. Its apparatus is composed of sine wave generator, voltage-current sampler, measuring interface, tong-test transformer, CPU, LCD and power supply. Its advantages include high efficiency, easy operation and high precision.
Description
The invention belongs in the electric system power transmission engineering measurement of the stake resistance of ultra-high-tension power transmission line electricity tower.
Have only the less than 1% of single down conductor at electric system mesohigh, big grid power transmission line electricity tower, and adopt two and two above down conductors account for 99%.The electricity top of tower has the built on stilts lightning protection line that links to each other with downlead again.
Before the present invention, the tie point of down conductor and electric tower is untied when measuring electric tower stake resistance and normally measuring, and like this, not only intensity of workers is big, inefficiency, and the string button is arranged unavoidably and twist off, even cause the consequence that can't restore.Even the foreign instrument of introducing, for example the UNILAP 701 X type Safety ControlTestInstrument for stakeless earth testing of Austria's production also can only finish the grounding resistance measurement with single down conductor electricity tower.Yet Chinese electric tower has many down conductors and but accounts for 99%.Simultaneously, the data that this instrument is measured are electric tower self metal loop (see figure 1), and the resistance in parallel of adjacent electric tower stake resistance with front and back, rather than the resistance veritably of electric tower self.Both made measurement, and also needed to increase tens of several voltages, electric current auxiliary electrodes and go between the same complexity of measuring to hundreds of meters.
The object of the invention is to provide a kind of need not to untie electric tower down conductor and electric tower tie point, tower bottom had one or more down conductor, and tower top has and the electric tower of downlead by tower grounding rack air defence in parallel thunder line, makes method and device thereof that stake resistance is measured fast.
The present invention seeks to realize like this:
A kind of release-free electric cable tower ground resistance testing method, it is characterized in that in the elementary winding of pincerlike transformer, injecting equal and opposite in direction, frequency is identical, the power supply signal of phase place unanimity, in pincerlike transformer, finish simultaneously primary and secondary voltage, current measurement, and a voltage, one or more electric current are sent into CPU carry out data processing, the gained result delivers to display and shows, just obtains tested electric tower grounding resistance.Described pincerlike transformer vises many down conductors of electric tower.
A kind of release-free electric cable tower ground resistance proving installation is characterized in that by sine-wave generator a, and current-voltage sampling circuit b measures interface c, pincerlike transformer d, CPU liquid crystal display e and power supply f seven most of compositions; Described composition a-b-c-d, the b-CPU-e two-way is linked in sequence, and a-b-c-d one tunnel is data acquisition, and b-CPU-e one tunnel is a data processing; But the iron core of described pincerlike transformer circularizes folding, and winding is elementary on it, and this external circuit of tested downlead of being lived by the iron core ring clamp is secondary.
In conjunction with the accompanying drawings, further specify content of the present invention.
The method of testing schematic diagram of earth resistance before Fig. 1 the present invention
Fig. 2 principle of the invention test pattern
The single tower equivalent circuit diagram of Fig. 3 the present invention
Fig. 4 principle of instrument block diagram of the present invention
Symbol among the figure: 1 built on stilts lightning protection line 2 tacheometers 3 pincerlike transformers
4 electric tower down conductor 5 ground connection equivalent resistances 6 grounded screens
7 electric tower 8 UNILAP, 9 clamps on amperemeter and voltage tables
3 electric towers in shown in Figure 2, the left side be the 1st electric tower, the centre is the 2nd electric tower, the right side be the 3rd electric tower. Earth resistance 5 is equivalent resistances, and grounded screen 6 is to be embedded in underground wire netting. When measuring, pincerlike transformer 3 is vised electricity The tower down conductor is opened instrument, can measure. After having surveyed the 2nd electric tower earth resistance, instrument is moved to 3 electric towers are measured, and by that analogy, measure by tower. If every tower has many down conductors, just use a plurality of pincers Transformer vises.
Fig. 3 is single tower equivalent circuit diagram, about represent it is the equivalently resistance of each electric tower ground connection along vertical line, every tower has a resistance Ri, i=1,2 ... n. Make RxRepresent measured electric tower earth resistance, R is the apparatus measures value. R=R thenx+R
1
∥R
2∥…R
NAnd R1、R
2Rn be with tested electric tower before and after the equivalently resistance of adjacent electric tower. Here, because R1、
R
2After the Rn parallel connection, its comprehensive effectively resistance only accounts for tested earth resistance Rx5%-10%, can ignore, so we are similar to and think R ≈ Rx This can satisfy the actual motion requirement in engineering.
Fig. 4 is principle of instrument block diagram of the present invention. This earth resistance tacheometer divides seven major parts, namely by sine-wave generator a, voltage Current sampling circuit b, measurement interface c, pincerlike transformer d, CPU, liquid crystal display e and power supply f seven most of compositions.
Measurement interface output equal and opposite in direction, a plurality of test signals that frequency is identical, phase place is consistent are delivered to pincerlike transformer. Like this, Can make all be in same test mode by the down conductor to be measured that pincerlike transformer vises, force the measuring-signal electric current Can only be from tested electric tower down conductor, the built on stilts lightning protection line electric tower ground connection equivalent resistance adjacent to front and back flows to grounded screen, Get back to the power supply other end. So just, consist of the secondary of pincerlike transformer. Thereby this secondary loop is because of the earth resistance difference And different secondary current voltage is arranged.
Sine-wave generator produces the power supply sinusoidal wave or other waveforms of 40-60Hz and 500Hz～150KHz and delivers to pincer The primary side of transformer seals in a measuring resistance again in primary side, just can measure the electric current of primary side, then according to change The depressor operation principle can draw the secondary current of pincerlike transformer, the electric current of the grounded screen of namely flowing through and produce in grounded screen Voltage, again this voltage, one or more electric current are sent into CPU and carry out data and process, acquired results is delivered to display Showing, is electric tower grounding resistance. 40-60Hz is used for measuring the ground connection of the electric tower with single down conductor Resistance, 500Hz～150KHz are used for the earth resistance of the electric tower of two and two above down conductors of measurement.
Advantage of the present invention:
1. not having the lineman of separating, to make personnel labor intensity little, high efficiency.
2. easy to use, measured value is accurate.
3. economize through actual analysis and can in the work of electric tower grounding resistance measurement, economize on the use of funds 2,600,000 every year.
Embodiment
Pincerlike transformer primary and secondary turn ratio is 5: 1, and 4 pincerlike transformers vise 4 down conductors of an electric tower, and the sine-wave generator frequency is elected 100KHz as, records earth resistance 3 Ω.
Claims (2)
1, a kind of release-free electric cable tower ground resistance testing method, it is characterized in that in the elementary winding of pincerlike transformer, injecting equal and opposite in direction, frequency is identical, the power supply signal of phase place unanimity, in pincerlike transformer, finish simultaneously primary and secondary voltage, current measurement, and a voltage, one or more electric current are sent into CPU carry out data processing, the gained result delivers to display and shows, just obtains tested electric tower grounding resistance.Described pincerlike transformer vises many down conductors of electric tower.
2, a kind of release-free electric cable tower ground resistance proving installation is characterized in that by sine-wave generator a, and current-voltage sampling circuit b measures interface c, pincerlike transformer d, CPU liquid crystal display e and power supply f seven most of compositions; Described composition a-b-c-d, the b-CPU-e two-way is linked in sequence, and a-b-c-d one tunnel is data acquisition, and b-CPU-e one tunnel is a data processing; But the iron core of described pincerlike transformer circularizes folding, and winding is elementary on it, and this external circuit of tested downlead of being lived by the iron core ring clamp is secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120774 CN1158425A (en) | 1996-11-26 | 1996-11-26 | Release-free electric cable tower ground resistance testing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120774 CN1158425A (en) | 1996-11-26 | 1996-11-26 | Release-free electric cable tower ground resistance testing method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1158425A true CN1158425A (en) | 1997-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96120774 Pending CN1158425A (en) | 1996-11-26 | 1996-11-26 | Release-free electric cable tower ground resistance testing method and device |
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| CN (1) | CN1158425A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397087C (en) * | 2006-02-21 | 2008-06-25 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN104502726A (en) * | 2014-12-01 | 2015-04-08 | 国网辽宁省电力有限公司锦州供电公司 | Method for measuring the power-frequency grounding resistance of tower and cement pole |
| 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 |
| 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 |
| CN106645975A (en) * | 2016-10-20 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Transformer station independent lightning rod grounding device grounding impedance measuring system and method |
| 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 |
| CN109884400A (en) * | 2019-03-19 | 2019-06-14 | 长春工程学院 | Transmission tower ground resistance on-Line Monitor Device based on double measurement patterns |
| CN116539963A (en) * | 2023-04-28 | 2023-08-04 | 烟台国网中电电气有限公司 | Method for detecting grounding resistance of grounding down conductor of power transmission line tower |
-
1996
- 1996-11-26 CN CN 96120774 patent/CN1158425A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397087C (en) * | 2006-02-21 | 2008-06-25 | 武汉高压研究所 | Pole tower earthing resistance quick testing method without unfastening wire and device |
| CN104502726A (en) * | 2014-12-01 | 2015-04-08 | 国网辽宁省电力有限公司锦州供电公司 | Method for measuring the power-frequency grounding resistance of tower and cement pole |
| 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 |
| 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 |
| CN106645975A (en) * | 2016-10-20 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Transformer station independent lightning rod grounding device grounding impedance measuring system and method |
| 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 |
| CN109884400A (en) * | 2019-03-19 | 2019-06-14 | 长春工程学院 | Transmission tower ground resistance on-Line Monitor Device based on double measurement patterns |
| CN116539963A (en) * | 2023-04-28 | 2023-08-04 | 烟台国网中电电气有限公司 | Method for detecting grounding resistance of grounding down conductor of power transmission line tower |
| CN116539963B (en) * | 2023-04-28 | 2023-11-21 | 烟台国网中电电气有限公司 | Method for detecting grounding resistance of grounding down conductor of power transmission line tower |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |