CN106291067A - A kind of step voltage method of testing of extra-high voltage direct-current vertical grounding electrode - Google Patents
A kind of step voltage method of testing of extra-high voltage direct-current vertical grounding electrode Download PDFInfo
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- CN106291067A CN106291067A CN201610966364.4A CN201610966364A CN106291067A CN 106291067 A CN106291067 A CN 106291067A CN 201610966364 A CN201610966364 A CN 201610966364A CN 106291067 A CN106291067 A CN 106291067A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
The invention discloses the step voltage method of testing of a kind of extra-high voltage direct-current vertical grounding electrode.Described step voltage method of testing is as follows: described method of testing is tested when earthing pole is debugged, internal ring and the outer shroud of earthing pole are divided into four quadrants, in four quadrant areas of outer shroud, choose 4～6 electrode wells respectively measure as with reference to test point, four quadrant areas of internal ring are chosen 3～4 electrode wells respectively measure as with reference to test point, on each reference test point surrounding ground with 1m as current potential, choose multiple test point respectively to test, circuit tester test is used to obtain multiple step voltage value, and choose the step voltage value step voltage value as this reference test point of maximum.The electric current that the method for testing that the present invention provides injects earthing pole location is relatively big, and can reach the specified earth current of earthing pole, by testing the step voltage under specified earth current, it is possible to well reflection earthing pole electric property.
Description
Technical field
The present invention relates to vertical grounding electrode step voltage technical field of measurement and test, particularly relate to a kind of extra-high voltage direct-current and vertically connect
The step voltage method of testing in earth polar.
Background technology
Extra-high voltage direct-current transmission earthing pole can transmit electric power for system for a long time, improves system operation reliability and clamping down on and changes
Stream station (rectifying valve) neutral point potential, it is to avoid the two poles of the earth voltage-to-ground is uneven and damages equipment.Powerful DC current is grounded
Pole is injected the earth and location, pole ground potential will be caused to raise, and the new problems such as the heating of step voltage, soil, electrode corrosion occurs.
Current domestic main earthing pole arrangement is the most main with horizontal grounding, but the floor space of horizontal grounding pole is relatively
Greatly, along with being continuously increased of DC engineering, the addressing of earthing pole, problems of land utilization are more and more prominent, and vertical grounding electrode starts application
In DC engineering.Vertical grounding electrode floor space is little, can directly induce current into depths, stratum, have fewer environmental impacts, and one
As suitable topsoil resistivity is high and location, pole that deep layer is relatively low or the place that location, pole is restricted.
Step voltage test is the maximum stride magnitude of voltage in order to find ground, earthing pole location, thus to earthing pole electrical resistance
Can be estimated.Step voltage test generally uses test apparatus to earthing pole location injection testing electric current, tests in earthing pole location
Obtain step voltage value, test result is converted step voltage value during earth current specified to earthing pole by electric current.This
Method test electric current is less, is usually no more than 200A, although can test the step voltage value obtaining ground, earthing pole location, but by
Less in the electric current injecting earthing pole location, the step voltage value produced on ground, earthing pole location is less, usually mV rank, test
The voltmeter used in step voltage test process or circuit tester limited precision, it is impossible to accurately read striding of ground, earthing pole location
Magnitude of voltage, and new error can be introduced by electric current conversion, therefore the step voltage that this method of testing obtains is the most accurate.
Summary of the invention
For the deficiencies in the prior art, the invention discloses the step voltage test of a kind of extra-high voltage direct-current vertical grounding electrode
Method.
Technical scheme is as follows: the step voltage method of testing of a kind of extra-high voltage direct-current vertical grounding electrode, described
Step voltage method of testing is as follows: described method of testing is tested when earthing pole is debugged, by internal ring and the outer shroud of earthing pole
It is divided into four quadrants, four quadrant areas of outer shroud is chosen 4～6 electrode wells respectively and surveys as with reference to test point
Amount, chooses 3～4 electrode wells respectively and measures, in each reference as with reference to test point in four quadrant areas of internal ring
Test point surrounding ground, with 1m as current potential, is chosen multiple test point respectively and is tested, and each test point uses circuit tester test
Obtain step voltage value, and choose the step voltage value step voltage value as this reference test point of maximum.
The rated direct voltage of described extra-high voltage direct-current is ± 800kV, inject earthing pole location test electric current be 800A～
3125A。
The precision of described circuit tester is 0.1mV.
For preventing the impact on test result that polarizes at test process earthing pole, test process uses copper sulfate ginseng
Eliminate polarization than electrode, before test, two copper sulfate reference electrodes are matched, the electricity between two copper sulfate reference electrodes
Potential difference is less than 5mV.
As preferably, when current conversion station extra-high voltage direct-current vertical grounding electrode is debugged in one pole the earth mode, described in stride electricity
Pressure method of testing is as follows: internal ring and the outer shroud of earthing pole are divided into four quadrants, select respectively in four quadrant areas of outer shroud
Take 5 electrode wells to measure as with reference to test point, four quadrant areas of internal ring are chosen 3 electrode wells respectively as ginseng
Examine test point to measure, on each reference test point surrounding ground with 1m as current potential, have chosen multiple test point respectively and carry out
Test, test obtains multiple step voltage value, and chooses a step voltage value of maximum as the electricity that strides with reference to test point
Pressure value, when testing electric current and being 800A, all tests with reference to the surrounding ground of test point selected 32, and from 32
With reference to test point finding out maximum 5 of step voltage with reference to test points, and respectively under 2400A and 3125A electric current to 5 ginsengs
Examine test point to be tested, obtain each maximum stride voltage with reference to test point, finally from electric current be test during 3125A
Result have found the maximum stride magnitude of voltage of five test points.
During existing method test step voltage, electric current is less, although can test the step voltage obtaining ground, earthing pole location
Value, but less owing to injecting the electric current of earthing pole location, and the step voltage value produced on ground, earthing pole location is less, usually mV level
Not, voltmeter or the circuit tester limited precision of step voltage are tested, it is impossible to accurately read the step voltage value on ground, earthing pole location,
And new error can be introduced by electric current conversion, therefore the step voltage that this method of testing obtains is accurate not, the present invention is connecing
Carry out step voltage test under earth polar debugging electric current just to carry out before earthing pole puts into operation, and can before earthing pole puts into operation just
Find step voltage maximum and the step voltage distribution of earthing pole, it is possible to before putting into operation, earthing pole operating condition is commented
Estimating, the system power that the present invention injects in earthing pole location is relatively big, and can reach the specified earth current of earthing pole, this kind of mode
Can test and obtain accurate step voltage value.
Compared with prior art, the method have the advantages that
1) carrying out step voltage test when debugging and have preferable practicality, this kind of method of testing can select multiple electric current
Value is tested, and test result is analyzed, and finds out the step voltage value of maximum；
2) this kind of method of testing injects the electric current of earthing pole location relatively greatly, and can reach the specified earth current of earthing pole,
By testing the step voltage under specified earth current, it is possible to well reflection earthing pole electric property；
3) this kind of method of testing is converted without electric current, it is possible to avoid the error of electric current conversion result；
4) this kind of method of testing is tested for the step voltage of vertical grounding electrode and is had preferable practicality, and can basis
Test result under low current tentatively judges the position of step voltage maximum, and test obtains maximum when specified earth current
Step voltage value；
5) this kind of test mode can apply to follow-up vertical grounding electrode step voltage test, it is possible on this basis
Improve.
Accompanying drawing explanation
Fig. 1 is Pu'er current conversion station earthing pole step voltage electrode wells and the test point location drawing；
In figure: 1～61 represent electrode wells respectively,Representing test reference point, 0 and 1+ represents work progress
In the electrode wells that newly adds；
Fig. 2 is result of the test broken line graph.
Detailed description of the invention
Below in conjunction with specific embodiment, technical scheme is described in further details.
Embodiment 1
The vertical grounding electrode pattern of ± 800kV Pu'er current conversion station earthing pole is domestic to use first.Earth electrode field is positioned at
Qian Ying village, Yongping town, Jinggudaizuyizu Autonomous County, Nan Sheng Puer City, designs ceiling voltage 35kV, and straight-flow system transmission capacity is
5000MW, the maximum rated current that continues is 3125A, maximum overload electric current (2h) 3461A, maximum transient electric current (3s) 4539A,
Maximum allowable step voltage 9.72V.
Earth resistance design load is 0.162 Ω (value of calculation), according to system condition, location, pole lineament and the soil of location, pole
Earth parameter is designed, and location, pole uses the irregular dicyclo vertical-type earthing pole design arranged according to landform.Outer shroud arranges 40
Individual vertical electrode well, internal ring arranges 23 vertical electrode wells, the long 30m of electrode bar, and electrode tip is about 5m away from ground, electrode wells diameter
1.2m, uses oil calcined coke to fill.
Debugging electric current beam order and time
The present embodiment selects to test when earthing pole is debugged.During earthing pole is debugged, debugging electric current is the most relatively
Greatly, minimum current reaches 800A, and can continue one hour, beneficially testing crew each position, ground, earthing pole location is carried out across
Step voltage tester, finds out step voltage distribution situation；And debugging electric current can reach the specified earth current 3125A of earthing pole,
Therefore the test under the specified earth current of earthing pole obtains step voltage value and need not convert, it is to avoid electric current converts the mistake brought
Difference.Comprehensive case above, test under debugging electric current the result that obtains can the actual operating mode of accurate response earthing pole, from
And obtain more accurate step voltage value.Debugging electric current injects smoothly and the time is as follows:
Table 1 debugs electric current beam order and time
Step voltage selects with reference to test point
Step voltage test request finds the step voltage value of maximum in the range of earth electrode field, but this earthing pole uses
Vertical-type earthing pole scheme, the electric current flowing into the earth all passes through vertical electrode importing the earth, and the most each electrode wells position is
The position of location, pole highest current density, corresponding step voltage is the most maximum.But the time that debugging electric current injects is shorter, be limited
Time in complete all electrode wells step voltage test more difficulty.In order to find maximum within the time of regulation
Step voltage value, also can react the distribution situation of ground, whole earthing pole location step voltage simultaneously, internal ring and outer shroud are divided into four
Individual quadrant, chooses 5 electrode wells in four quadrant areas of outer shroud respectively and measures as with reference to test point, the 4 of internal ring
Individual quadrant area is chosen 3 electrode wells respectively measure as with reference to test point, have selected altogether 32 with reference to test point
Testing, selected reference test point position is as shown in Figure 1.
Step voltage test process
For preventing the impact on test result that polarizes at test process earthing pole, test process uses copper sulfate ginseng
Polarization is eliminated than electrode.Two copper sulfate reference electrodes are matched, between two copper sulfate reference electrodes before Shi Yan
Potential difference is less than 5m V.
Test have employed the circuit tester that measuring accuracy is 0.1m V and carry out step voltage test, it is ensured that test result
Accuracy.
In test process, on each reference test point (electrode wells) surrounding ground with 1m as current potential, have chosen multiple respectively
Test point is tested, and test obtains multiple step voltage value, and chooses a step voltage value of maximum as with reference to test
The step voltage value of point.When debugging electric current and being 800A, selected 32 are all surveyed with reference to test point surrounding ground
Examination, and from 32 reference test points, have found 5 reference test points that step voltage is bigger, and respectively when 2400A and 3125A
5 are tested with reference to test point (#32, #31, #7, #2, #1 electrode wells), have obtained each ginseng during 2400A and 3125A
Examining the maximum stride voltage of test point, finally the test result when 3125A have found the maximum stride voltage of five test points
Value is 9.431V, and this test value is the step voltage value on ground, earthing pole location.Its test result is as shown in table 2:
The step voltage test value under electric current debugged by table 2
Test result analysis
Test result in table 2 is analyzed, have selected and stride with reference to test point #32, #31, #7 electrode wells
The linear analysis of voltage tester result, and depict broken line graph, see Fig. 2.From broken line graph it is found that along with electric current constantly increases
Adding, each step voltage with reference to test point the most linearly increases, and i.e. for this vertical grounding electrode, uses and tests under test current
Obtain step voltage, and the mode carrying out electric current conversion can not accurately reflect the electric property of earthing pole, and at debugging electric current
Under carry out testing the result obtained and can reflect the electric property of earthing pole the most accurately.
The maximum stride magnitude of voltage obtained as test, when this step voltage value is earthing pole injection rated current 3125A
Recording, it is possible to accurately reflect earthing pole electric property, this test result meets design and requires the requirement of step voltage≤9.72V,
And offer reference can be run for the operation one pole the earth that earthing pole is later.
Claims (5)
1. the step voltage method of testing of an extra-high voltage direct-current vertical grounding electrode, it is characterised in that described step voltage is tested
Method is as follows: described method of testing is tested when earthing pole is debugged, and internal ring and the outer shroud of earthing pole are divided into four quadrants,
In four quadrant areas of outer shroud, choose 4～6 electrode wells respectively as measuring with reference to test point, four of internal ring as
Limit region chooses 3～4 electrode wells respectively as measuring with reference to test point, each with reference to test point surrounding ground with
1m is current potential, chooses multiple test point respectively and tests, and each test point uses circuit tester test to obtain step voltage value, and
Choose the step voltage value step voltage value as this reference test point of maximum.
2. the step voltage method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that described
Extra-high voltage direct-current rated direct voltage is ± 800kV, and the test electric current of extra-high voltage direct-current vertical grounding electrode is 800A～3125A.
3. the step voltage method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that described
The precision of circuit tester is 0.1mV.
4. the step voltage method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that test
During use copper sulfate reference electrode to eliminate polarization, before test, two copper sulfate reference electrodes are matched, two sulfur
Potential difference between acid copper reference electrode is less than 5mV.
5. the step voltage method of testing of the extra-high voltage direct-current vertical grounding electrode as described in Claims 1 to 4 is arbitrary, its feature exists
In, when current conversion station extra-high voltage direct-current vertical grounding electrode is debugged in one pole the earth mode, described step voltage method of testing is as follows:
Internal ring and the outer shroud of earthing pole are divided into four quadrants, four quadrant areas of outer shroud are chosen 5 electrode wells conducts respectively
Measure with reference to test point, four quadrant areas of internal ring are chosen 3 electrode wells respectively and surveys as with reference to test point
Amount, on each reference test point surrounding ground with 1m as current potential, have chosen multiple test point respectively and tests, and test obtains many
Individual step voltage value, and choose the step voltage value step voltage value as reference test point of maximum, at test electric current
During for 800A, selected 32 are all tested with reference to the surrounding ground of test point, and look for from 32 reference test points
Go out 5 reference test points that step voltage is maximum, and under 2400A and 3125A electric current, 5 are carried out with reference to test points respectively
Test, obtains each maximum stride voltage with reference to test point, is finally that test result during 3125A have found five from electric current
The maximum stride magnitude of voltage of test point.
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| CN107831353A (en) * | 2017-11-09 | 2018-03-23 | 江苏大学 | A kind of computational methods of the new step voltage based on annular D. C. Electric transmission earthed pole different buried depth |
| CN108804763A (en) * | 2018-05-07 | 2018-11-13 | 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 vertical-type direct current grounding pole step voltage computational methods based on shunting test result |
| CN109188059A (en) * | 2018-10-09 | 2019-01-11 | 国网河南省电力公司新密市供电公司 | A kind of step voltage detection method and device |
| CN110441587A (en) * | 2019-07-22 | 2019-11-12 | 中国电力科学研究院有限公司 | A kind of method and system obtaining direct current grounding pole step voltage |
| CN111581775A (en) * | 2020-04-05 | 2020-08-25 | 国网湖北省电力有限公司检修公司 | Vertical grounding electrode temperature rise calculation method for mutual influence between electrode wells |
| CN112395750A (en) * | 2020-11-06 | 2021-02-23 | 长沙理工大学 | Method for reducing power frequency step voltage of urban power transmission steel pipe tower grounding device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831353A (en) * | 2017-11-09 | 2018-03-23 | 江苏大学 | A kind of computational methods of the new step voltage based on annular D. C. Electric transmission earthed pole different buried depth |
| CN107831353B (en) * | 2017-11-09 | 2020-08-28 | 江苏大学 | Novel step voltage calculation method based on different burial depths of annular direct current transmission grounding electrode |
| CN108804763A (en) * | 2018-05-07 | 2018-11-13 | 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 vertical-type direct current grounding pole step voltage computational methods based on shunting test result |
| CN109188059A (en) * | 2018-10-09 | 2019-01-11 | 国网河南省电力公司新密市供电公司 | A kind of step voltage detection method and device |
| CN109188059B (en) * | 2018-10-09 | 2023-09-05 | 国网河南省电力公司新密市供电公司 | Step voltage detection method and device |
| CN110441587A (en) * | 2019-07-22 | 2019-11-12 | 中国电力科学研究院有限公司 | A kind of method and system obtaining direct current grounding pole step voltage |
| CN111581775A (en) * | 2020-04-05 | 2020-08-25 | 国网湖北省电力有限公司检修公司 | Vertical grounding electrode temperature rise calculation method for mutual influence between electrode wells |
| CN111581775B (en) * | 2020-04-05 | 2022-05-20 | 国网湖北省电力有限公司超高压公司 | Vertical grounding electrode temperature rise calculation method for mutual influence between electrode wells |
| CN112395750A (en) * | 2020-11-06 | 2021-02-23 | 长沙理工大学 | Method for reducing power frequency step voltage of urban power transmission steel pipe tower grounding device |
| CN112395750B (en) * | 2020-11-06 | 2022-09-09 | 长沙理工大学 | Method for reducing power frequency step voltage of urban power transmission steel pipe tower grounding device |
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