CN104502726A - Method for measuring the power-frequency grounding resistance of tower and cement pole - Google Patents
Method for measuring the power-frequency grounding resistance of tower and cement pole Download PDFInfo
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- CN104502726A CN104502726A CN201410720659.4A CN201410720659A CN104502726A CN 104502726 A CN104502726 A CN 104502726A CN 201410720659 A CN201410720659 A CN 201410720659A CN 104502726 A CN104502726 A CN 104502726A
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Abstract
Provided is a method for measuring the power-frequency grounding resistance of a tower and a cement pole, which can greatly improve the test efficiency and test accuracy, detect poor grounding in a timely manner and improve the lightning withstand level of equipment. The method comprises the following steps: (a) checking the grounding electrodes of a tower and a cement pole; (b) measuring the grounding resistance of each grounding electrode by a meter clamping method under the condition of not dismounting the grounding electrodes, executing the step (c) if a grounding electrode with the grounding resistance less than l ohm is found in measurement, and executing the steps (d) and (e) and checking whether the situation of unqualified grounding electrodes or poor contact of a lightning conductor above the tower exists if a grounding electrode of which the grounding resistance is increased obviously or exceeds the corresponding requirement or the regulation on the value of the grounding resistance is found in measurement through comparison with the values of grounding resistance of other grounding electrodes around and the previous values of the grounding electrode; (c) measuring the overall grounding resistance of the tower by a meter clamping method under the condition of retaining one grounding wire; (d) measuring the overall grounding resistance of the tower by a three-electrode method; and (e) measuring the grounding resistance of each grounding electrode of the tower by a three-electrode method.
Description
Technical field
the present invention relates to onethe measuring method of steel tower and cement pole power frequency earthing resistance.
Background technology
The classic method of tower grounding test is earthing megohm meter method of testing, and workload is large, efficiency is low, and it is more that test result is subject to on-the-spot influence factor.For a fairly large number of area of shaft tower, adopt three electrode method test to be difficult to, actual motion is difficult to the accuracy and the promptness that ensure test in safeguarding.Pincerlike meter tests test method is simple, but due to the incorrect of method and to service condition grasp indefinite, do not popularize at power department always.
Summary of the invention
The technical problem to be solved in the present invention is to provide the accuracy greatly improving testing efficiency and test, Timeliness coverage imperfect earth, improves the steel tower of equipment lightning withstand level and the measuring method of cement pole power frequency earthing resistance.
Technical solution of the present invention is:
The measuring method of steel tower and cement pole power frequency earthing resistance, its step is as follows:
A () steel tower and cement pole earthing pole check
First check whether test line steel tower and cement pole meet earthing device characterisitic parameter and measure directive/guide DL/T 475-2006, record lightning conducter model, shaft tower height, earthing pole pattern, shaft tower numbering, earthing pole numbering, soil regime and work as ground temperature, checking the electrical connection situation of tested tower grounding line, then performing record and process in time as found that there is the abnormal conditions such as ground wire destroys or bolt is stolen;
B () uses the stake resistance of the every root earthing pole of pincers meter method for measuring in earthing pole situation not tearing open
Do not tear earthing pole open, use pincerlike earth resistance tester to measure the stake resistance of every root earthing pole respectively; Open pincerlike earth resistance tester jaw during measurement, use tester to vise each ground wire by root, make ground wire placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
If find that there is earthing pole stake resistance during measurement to be less than l ohm, then may exist in ground between each earthing pole or the situation that in basis, metal connects, now perform step (c), whole shaft tower is used pincers meter method for measuring as a whole;
If find in measurement with other earthing poles of surrounding and this earthing pole in the past numeric ratio comparatively have earthing pole stake resistance obviously to increase, or exceed the regulation to grounding resistance in corresponding standard or code, then check whether this earthing pole coupling bolt loosens or loose contact, still increase if remeasured after eliminating or exceed standard, three electrode method is then adopted to perform step (d) and step (e), check whether that to there is earthing pole defective, or the situation such as lightning conducter loose contact above steel tower, to judge its reason and corresponding rectification;
C () uses the stake resistance of pincers meter method for measuring steel tower entirety in reservation ground wire situation
Only retain a ground wire to be connected with shaft tower tower body, all the other ground wires all should disconnect with shaft tower tower body and can not with shaft tower tower body Metal Contact, and with having the wire of insulation rubber by parallel with the ground wire be retained for other ground wires disconnected, and contact is good, is measured as a whole by tower grounding device; Pincerlike earth resistance tester jaw is opened during measurement, tester is used to vise that root ground wire be retained, pincerlike earth resistance tester should be positioned at the top of all parallel connections, make the ground wire that is retained placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
D () three electrode method measures the stake resistance of tower entirety
By all ground wires with disconnects with shaft tower tower body, but can not with shaft tower tower body Metal Contact, and in parallel with all ground wires having the wire of insulation rubber to disconnect, tower grounding device is measured by employing three electrode method as a whole;
E () three electrode method measures the stake resistance of the every root earthing pole of steel tower
Remove the parallel connections between ground wire, use three electrode method to measure the stake resistance of the every root earthing pole of steel tower respectively.
The invention has the beneficial effects as follows: first use pincerlike method to measure the stake resistance of earthing pole, three electrode method is adopted to measure again when the stake resistance of earthing pole is abnormal, two kinds of methods are organically combined, greatly improve the accuracy of testing efficiency and test, so that Timeliness coverage imperfect earth, improve steel tower and the cement pole power frequency earthing resistance of equipment lightning withstand level.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the power frequency earthing resistance not tearing the every root earthing pole of earthing pole pincers meter method for measuring open;
Fig. 2 is the schematic diagram of the power frequency earthing resistance of reservation earthing pole pincers meter method for measuring steel tower and cement pole entirety;
Fig. 3 is the schematic diagram that three electrode method measures the power frequency earthing resistance of steel tower and cement pole entirety;
Fig. 4 is the schematic diagram that three electrode method measures the power frequency earthing resistance of steel tower and the every root earthing pole of cement pole;
In figure: P-voltage pole, C-electric current pole.
Embodiment
As shown in the figure, the measuring method of steel tower and cement pole power frequency earthing resistance, its step is as follows:
A () steel tower and cement pole earthing pole check
First check whether test line steel tower and cement pole meet earthing device characterisitic parameter and measure directive/guide DL/T 475-2006, record lightning conducter model, shaft tower height, earthing pole pattern, shaft tower numbering, earthing pole numbering, soil regime and work as ground temperature, checking the electrical connection situation of tested tower grounding line, record should be performed and process in time as found that there is the abnormal conditions such as ground wire destroys or bolt is stolen;
B () uses the stake resistance of the every root earthing pole of pincers meter method for measuring in earthing pole situation not tearing open
Do not tear earthing pole open, use pincerlike earth resistance tester to measure the stake resistance of every root earthing pole A, B, C, D respectively, as shown in Figure 1; Open pincerlike earth resistance tester jaw during measurement, use tester to vise each ground wire by root, make ground wire placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
If find that there is earthing pole stake resistance during measurement to be less than l ohm, then may exist in ground between each earthing pole or the situation that in basis, metal connects, now perform step (c), whole shaft tower is used pincers meter method for measuring as a whole;
If find in measurement with other earthing poles of surrounding and this earthing pole in the past numeric ratio comparatively have earthing pole stake resistance obviously to increase, or exceed the regulation to grounding resistance in corresponding standard or code, then check whether this earthing pole coupling bolt loosens or loose contact, still increase if remeasured after eliminating or exceed standard, then perform step (d) and step (e), check whether that to there is earthing pole defective, or the situation such as lightning conducter loose contact above steel tower, to judge its reason and corresponding rectification.
C () uses the stake resistance of pincers meter method for measuring steel tower entirety in reservation ground wire situation
Only retain a ground wire A to be connected with shaft tower tower body, all the other ground wires B, C, D and tower body disconnect and can not with shaft tower tower body Metal Contact, and with there being the wire of insulation rubber that ground wire B, C, D of disconnection is in parallel with the ground wire A be retained, and contact is good, tower grounding device is measured, as a whole as Fig. 2; Pincerlike earth resistance tester jaw is opened during measurement, tester is used to vise that root ground wire be retained, pincerlike earth resistance tester should be positioned at the top of all parallel connections, make the ground wire that is retained placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
D () three electrode method measures the stake resistance of tower entirety
All ground wire A, B, C, D and shaft tower tower body are disconnected, but can not with shaft tower tower body Metal Contact, and with having the wire of insulation rubber by parallel for all ground wires disconnected, adopt three electrode method earth resistance tester to measure, tower grounding device as Fig. 3 as a whole;
E () three electrode method measures the stake resistance of the every root earthing pole of steel tower
Remove the parallel connections between ground wire, use three electrode method to be measured the stake resistance of the every root earthing pole of steel tower respectively by earth resistance tester, as Fig. 4.
Claims (1)
1. the measuring method of steel tower and cement pole power frequency earthing resistance, is characterized in that step is as follows:
A () steel tower and cement pole earthing pole check
First check whether test line steel tower and cement pole meet earthing device characterisitic parameter and measure directive/guide DL/T 475-2006, record lightning conducter model, shaft tower height, earthing pole pattern, shaft tower numbering, earthing pole numbering, soil regime and work as ground temperature, checking the electrical connection situation of tested tower grounding line, then performing record and process in time as found that there is the abnormal conditions such as ground wire destroys or bolt is stolen;
B () uses the stake resistance of the every root earthing pole of pincers meter method for measuring in earthing pole situation not tearing open
Do not tear earthing pole open, use pincerlike earth resistance tester to measure the stake resistance of every root earthing pole respectively; Open pincerlike earth resistance tester jaw during measurement, use tester to vise each ground wire by root, make ground wire placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
If find that there is earthing pole stake resistance during measurement to be less than l ohm, then may exist in ground between each earthing pole or the situation that in basis, metal connects, now perform step (c), whole shaft tower is used pincers meter method for measuring as a whole;
If find in measurement with other earthing poles of surrounding and this earthing pole in the past numeric ratio comparatively have earthing pole stake resistance obviously to increase, or exceed the regulation to grounding resistance in corresponding standard or code, then check whether this earthing pole coupling bolt loosens or loose contact, still increase if remeasured after eliminating or exceed standard, then perform step (d) and step (e), check whether that to there is earthing pole defective, or the situation such as lightning conducter loose contact above steel tower, to judge its reason and corresponding rectification;
C () uses the stake resistance of pincers meter method for measuring steel tower entirety in reservation ground wire situation
Only retain a ground wire to be connected with shaft tower tower body, all the other ground wires all should disconnect with shaft tower tower body and can not with shaft tower tower body Metal Contact, and with having the wire of insulation rubber by parallel with the ground wire be retained for other ground wires disconnected, and contact is good, is measured as a whole by tower grounding device; Pincerlike earth resistance tester jaw is opened during measurement, tester is used to vise that root ground wire be retained, pincerlike earth resistance tester should be positioned at the top of all parallel connections, make the ground wire that is retained placed in the middle, as far as possible perpendicular to tester jaw place plane, and keep jaw contacts good, make tester work, read and record stable reading;
D () three electrode method measures the stake resistance of tower entirety
By all ground wires with disconnects with shaft tower tower body, but can not with shaft tower tower body Metal Contact, and in parallel with all ground wires having the wire of insulation rubber to disconnect, tower grounding device is measured by employing three electrode method as a whole;
E () three electrode method measures the stake resistance of the every root earthing pole of steel tower
Remove the parallel connections between ground wire, use three electrode method to measure the stake resistance of the every root earthing pole of steel tower respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
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Inventor after: Wang Aihua Inventor after: Cui Jisheng Inventor after: Chen Chuan Inventor after: Li Yan Inventor after: Tang Zhi Inventor before: Tang Zhi |
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