CN106291067B - A kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode - Google Patents

A kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode Download PDF

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Publication number
CN106291067B
CN106291067B CN201610966364.4A CN201610966364A CN106291067B CN 106291067 B CN106291067 B CN 106291067B CN 201610966364 A CN201610966364 A CN 201610966364A CN 106291067 B CN106291067 B CN 106291067B
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China
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test
voltage
current
test point
earthing pole
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CN201610966364.4A
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Chinese (zh)
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CN106291067A (en
Inventor
李红元
彭翔
陈禾
许毅
潘凯
龙方宇
周禹
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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
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Priority to CN201610966364.4A priority Critical patent/CN106291067B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only

Abstract

The invention discloses a kind of step voltage test methods of extra-high voltage direct-current vertical grounding electrode.The step voltage test method is as follows: the test method is tested when earthing pole is debugged, the inner ring and outer rings of earthing pole are divided into four quadrants, 4~6 electrode wells are chosen respectively in four quadrant areas of outer ring as measuring with reference to test point, 3~4 electrode wells are chosen in four quadrant areas of inner ring respectively as measuring with reference to test point, on each reference test point surrounding ground using 1m as current potential, multiple test points are chosen respectively to be tested, it tests to obtain multiple step voltage values using multimeter, and choose the step voltage value that a maximum step voltage value refers to test point as this.The electric current of test method injection provided by the invention earthing pole location is larger, and can reach the specified earth current of earthing pole, by the step voltage tested under specified earth current, can be good at reflecting earthing pole electric property.

Description

A kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode

Technical field

The present invention relates to vertical grounding electrode step voltage the field of test technology more particularly to a kind of extra-high voltage direct-current vertically to connect The step voltage test method in earth polar.

Background technique

Extra-high voltage direct-current transmission earthing pole can transmit electric power for a long time for system, improve system operation reliability and clamp down on and change Stream station (rectifying valve) neutral point potential, avoids the two poles of the earth voltage-to-ground uneven and damages equipment.Powerful DC current is grounded Pole injection the earth will lead to the raising of pole location ground potential, the new problems such as step voltage, soil fever, electrode corrosion occurs.

Main earthing pole arrangement domestic at present is extremely main with horizontal grounding, but the occupied area of horizontal grounding pole compared with Greatly, being continuously increased with DC engineering, the addressing of earthing pole, problems of land utilization are more and more prominent, and vertical grounding electrode starts to apply Into DC engineering.Vertical grounding electrode occupied area is small, can directly induce current into stratum depths, have fewer environmental impacts, and one As fit that topsoil resistivity is high and place that the lower pole location of deep layer or pole location are restricted.

Step voltage test is the maximum stride voltage value in order to find earthing pole location ground, thus to earthing pole electrical resistance It can be carried out assessment.Step voltage test generallys use test apparatus to earthing pole location injection testing electric current, tests in earthing pole location Step voltage value is obtained, test result is converted by electric current to step voltage value when earth current specified to earthing pole.It is this Method test electric current is smaller, is usually no more than 200A, although can test to obtain the step voltage value on earthing pole location ground, by Electric current in injection earthing pole location is smaller, smaller in the step voltage value that earthing pole location ground generates, usually mV rank, test The voltmeter or general-purpose meter accuracy used in step voltage test process is limited, cannot accurately read striding for earthing pole location ground Voltage value, and new error can be introduced by electric current conversion, therefore the step voltage that this test method obtains is inaccurate.

Summary of the invention

In view of the deficiencies of the prior art, the invention discloses a kind of tests of the step voltage of extra-high voltage direct-current vertical grounding electrode Method.

Technical scheme is as follows: a kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode, described Step voltage test method is as follows: the test method is tested when earthing pole is debugged, by the inner ring and outer rings of earthing pole It is divided into four quadrants, chooses 4~6 electrode wells respectively in four quadrant areas of outer ring and surveyed as with reference to test point It measures, chooses 3~4 electrode wells in four quadrant areas of inner ring respectively as measuring with reference to test point, in each reference Test point surrounding ground is chosen multiple test points respectively and is tested using 1m as current potential, and each test point is tested using multimeter Step voltage value is obtained, and chooses the step voltage value that a maximum step voltage value refers to test point as this.

The rated direct voltage of the extra-high voltage direct-current be ± 800kV, injection earthing pole location test electric current be 800A~ 3125A。

The precision of the multimeter is 0.1mV.

To prevent the influence in the polarization of test process earthing pole to test result, joined during the test using copper sulphate Polarization is eliminated than electrode, is matched two copper sulfate reference electrodes before test, the electricity between two copper sulfate reference electrodes Potential difference is less than 5mV.

Preferably, when converter station extra-high voltage direct-current vertical grounding electrode is when monopole the earth mode is debugged, the electricity that strides Pressure test method is as follows: the inner ring and outer rings of earthing pole being divided into four quadrants, are selected respectively in four quadrant areas of outer ring It takes 5 electrode wells as measuring with reference to test point, chooses 3 electrode wells in four quadrant areas of inner ring respectively as ginseng It examines test point to measure, on each reference test point surrounding ground using 1m as current potential, has chosen multiple test points respectively and carry out Test, test obtain multiple step voltage values, and choose a maximum step voltage value as the electricity that strides for referring to test point Pressure value tests the selected 32 surrounding ground with reference to test point, and when testing electric current is 800A from 32 Test point is referred to reference to finding out step voltage maximum 5 in test point, and 5 are joined under 2400A and 3125A electric current respectively It examines test point to be tested, obtains each maximum stride voltage with reference to test point, test when being finally 3125A from electric current As a result the maximum stride voltage value of five test points is had found.

Electric current is smaller when existing method tests step voltage, although can test to obtain the step voltage on earthing pole location ground Value, but since the electric current of injection earthing pole location is smaller, it is smaller in the step voltage value that earthing pole location ground generates, usually mV grades Not, voltmeter or the general-purpose meter accuracy for testing step voltage are limited, cannot accurately read the step voltage value on earthing pole location ground, And new error can be introduced by electric current conversion, therefore the step voltage that this test method obtains is inaccurate, the present invention is connecing Progress step voltage test under electric current is debugged in earth polar just to be carried out before earthing pole puts into operation, and can be before earthing pole puts into operation just It was found that the step voltage maximum value and step voltage of earthing pole are distributed, earthing pole operating condition can be commented before putting into operation Estimate, the present invention is larger in the system power that earthing pole location is injected, and can reach the specified earth current of earthing pole, this kind of mode It can test to obtain accurate step voltage value.

Compared with prior art, the invention has the following advantages:

1) step voltage test is carried out in debugging has preferable practicability, this kind of test method can select multiple electric currents Value is tested, and test result is compared and analyzed, and finds out maximum step voltage value;

2) electric current of this kind of test method injection earthing pole location is larger, and can reach the specified earth current of earthing pole, By the step voltage tested under specified earth current, can be good at reflecting earthing pole electric property;

3) this kind of test method is converted without electric current, can be avoided the error of electric current conversion result;

4) this kind of test method has preferable practicability for the step voltage test of vertical grounding electrode, and being capable of basis Test result under low current tentatively judges the position of step voltage maximum value, and tests to obtain maximum in specified earth current Step voltage value;

5) this kind of test mode can be applied to subsequent vertical grounding electrode step voltage test, and can be on this basis It improves.

Detailed description of the invention

Fig. 1 is Pu'er converter station earthing pole step voltage electrode wells and the test point location drawing;

In figure: 1~61 respectively indicates electrode wells,Indicate that test reference point, 0 and 1+ indicate work progress In newly plus electrode wells;

Fig. 2 is test result line chart.

Specific embodiment

Further details of the technical solution of the present invention combined with specific embodiments below.

Embodiment 1

The vertical grounding electrode pattern of the Pu'er ± 800kV converter station earthing pole is that the country uses for the first time.Earth electrode field is located at The Puer City Nan Sheng Jinggudaizuyizu Autonomous County Yongping town village Qian Ying, designs ceiling voltage 35kV, and direct current system transmission capacity is 5000MW, maximum continue rated current be 3125A, maximum overload electric current (2h) 3461A, maximum transient electric current (3s) 4539A, Maximum allowable step voltage 9.72V.

Ground resistance design value is 0.162 Ω (calculated value), according to the soil of system condition, pole location lineament and pole location Earth parameter is designed, and pole location uses the irregular bicyclic vertical-type earthing pole design scheme arranged according to landform.Outer ring setting 40 23 vertical electrode wells are arranged in a vertical electrode well, inner ring, and the long 30m of electrode bar, electrode tip is away from ground about 5m, electrode wells diameter 1.2m is filled using petroleum calcined coke.

Debug electric current beam sequence and time

The present embodiment selection is tested in earthing pole debugging.In earthing pole debugging process, debugging electric current usually compared with Greatly, minimum current reaches 800A, and can continue one hour, be conducive to testing crew to each position in earthing pole location ground carry out across Voltage tester is walked, step voltage distribution situation is found out;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 without conversion, avoids electric current conversion bring and misses Difference.In summary situation, the result tested in the case where debugging electric current are capable of the actual operating mode of accurate response earthing pole, from And obtain more accurate step voltage value.It debugs electric current injection smoothly and the time is as follows:

Table 1 debugs electric current beam sequence and time

Step voltage is selected with reference to test point

Step voltage test request finds maximum step voltage value within the scope of earth electrode field, but the earthing pole uses Vertical-type earthing pole scheme, the electric current for flowing into the earth all imports the earth by vertical electrode, therefore each electrode wells position is The position of pole location highest current density, corresponding step voltage are also maximum.But the time for debugging electric current injection is shorter, be limited Time in complete all electrode wells step voltage test it is more difficult.It is maximum in order to find before the deadline Step voltage value, while the distribution situation of entire earthing pole location ground step voltage can be also reacted, inner ring and outer rings are divided into four A quadrant, chooses 5 electrode wells as measuring with reference to test point respectively in four quadrant areas of outer ring, and the 4 of inner ring 3 electrode wells are chosen in a quadrant area respectively as measuring with reference to test point, have selected 32 to refer to test point altogether It is tested, it is selected as shown in Figure 1 with reference to test point position.

Step voltage test process

To prevent the influence in the polarization of test process earthing pole to test result, joined during the test using copper sulphate Polarization is eliminated than electrode.Two copper sulfate reference electrodes are matched before test, between two copper sulfate reference electrodes Potential difference is less than 5m V.

Measuring accuracy is used in test and carries out step voltage test for the multimeter of 0.1m V, ensure that test result Accuracy.

In test process, on each reference test point (electrode wells) surrounding ground using 1m as current potential, have chosen respectively multiple Test point is tested, and test obtains multiple step voltage values, and is chosen a maximum step voltage value and be used as with reference to test The step voltage value of point.When debugging electric current is 800A, selected 32 are surveyed with reference to test point surrounding ground Examination, and test point is referred to from 32 with reference to having found step voltage biggish 5 in test point, and respectively in 2400A and 3125A 5 are tested with reference to test point (#32, #31, #7, #2, #1 electrode wells), has obtained each ginseng when 2400A and 3125A Examine the maximum stride voltage of test point, finally from 3125A when test result have found the maximum stride voltage of five test points Value is 9.431V, which is the step voltage value on earthing pole location ground.Its test result is as shown in table 2:

Table 2 debugs the step voltage test value under electric current

Test result analysis

Test result in table 2 is analyzed, has selected to stride with reference to test point #32, #31, #7 electrode wells The linear analysis of voltage tester result, and line chart is depicted, see Fig. 2.From line chart it can be found that as electric current constantly increases Add, do not increase linearly with reference to the step voltage of test point respectively, i.e., for the vertical grounding electrode, using being tested under test current The mode for obtaining step voltage, and carrying out electric current conversion not can accurately reflect the electric property of earthing pole, and in debugging electric current The lower result tested more can accurately reflect the electric property of earthing pole.

As the maximum stride voltage value that test obtains, when which is that earthing pole injects rated current 3125A It measures, earthing pole electric property can be accurately reflected, which meets design requirement step voltage≤9.72V requirement, And reference can be provided for the later operation monopole the earth operation of earthing pole.

Claims (4)

1. a kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode, which is characterized in that the step voltage test Method is as follows: the test method is tested when earthing pole is debugged, and the inner ring and outer rings of earthing pole are divided into four quadrants, 4~6 electrode wells are chosen respectively in four quadrant areas of outer ring as measuring with reference to test point, four of inner ring as Choose 3~4 electrode wells respectively in limit region as measuring with reference to test point, it is each with reference to test point surrounding ground with 1m is current potential, chooses multiple test points respectively and is tested, and each test point tests to obtain step voltage value using multimeter, and Choose the step voltage value that a maximum step voltage value refers to test point as this;The nominal DC of the extra-high voltage direct-current Voltage is ± 800kV, and the test electric current of injection earthing pole location is 800A~3125A.
2. the step voltage test method of extra-high voltage direct-current vertical grounding electrode as described in claim 1, which is characterized in that described The precision of multimeter is 0.1mV.
3. the step voltage test method of extra-high voltage direct-current vertical grounding electrode as described in claim 1, which is characterized in that test Polarization is eliminated using copper sulfate reference electrode in the process, is matched two copper sulfate reference electrodes before test, two sulphur Potential difference between sour copper reference electrode is less than 5mV.
4. the step voltage test method of the extra-high voltage direct-current vertical grounding electrode as described in claims 1 to 3 is any, feature exist In when converter station extra-high voltage direct-current vertical grounding electrode is when monopole the earth mode is debugged, the step voltage test method is as follows: The inner ring and outer rings of earthing pole are divided into four quadrants, choose 5 electrode wells conducts respectively in four quadrant areas of outer ring It is measured with reference to test point, chooses 3 electrode wells in four quadrant areas of inner ring respectively and surveyed as with reference to test point Amount has chosen multiple test points respectively and is tested, test obtains more on each reference test point surrounding ground using 1m as current potential A step voltage value, and a maximum step voltage value is chosen as the step voltage value for referring to test point, in test electric current When for 800A, the selected 32 surrounding ground with reference to test points is tested, and from 32 with reference to being looked in test points Step voltage maximum 5 refer to test point out, and carry out respectively to 5 with reference to test point under 2400A and 3125A electric current Test, obtains each maximum stride voltage with reference to test point, and test result when being finally 3125A from electric current has found five The maximum stride voltage value of test point.
CN201610966364.4A 2016-10-28 2016-10-28 A kind of step voltage test method of extra-high voltage direct-current vertical grounding electrode CN106291067B (en)

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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

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CN202308338U (en) * 2011-11-15 2012-07-04 傅玉洁 Double-layer structure grounding grid with characteristics of effectively improving electric potential distribution and reducing step voltage
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