CN106526285A - Contact potential testing method of ultrahigh-voltage DC grounding electrode - Google Patents
Contact potential testing method of ultrahigh-voltage DC grounding electrode Download PDFInfo
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- CN106526285A CN106526285A CN201610963603.0A CN201610963603A CN106526285A CN 106526285 A CN106526285 A CN 106526285A CN 201610963603 A CN201610963603 A CN 201610963603A CN 106526285 A CN106526285 A CN 106526285A
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- contact potential
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a contact potential testing method of an ultrahigh-voltage DC grounding electrode, wherein testing is performed on a metal component at a grounding electrode site. A potential difference between a position with a horizontal distance of 1m to the metal component and ground with a vertical distance of 1.8m to the metal component is tested. Rated current is applied on the grounding electrode site. A result which is measured through a voltmeter is used as a contact potential tested value at the position. A highest measured contact potential tested value of the metal component is used as a contact potential testing result. According to the testing method provided by the invention, an actual contact potential obtained through conversion is not required, and direct measurement by means of the rated current is utilized, thereby realizing higher accuracy of the result.
Description
Technical field
The present invention relates to earthing pole technical field of measurement and test, more particularly to a kind of contact potential survey of extra-high voltage DC grounding electrode
Method for testing.
Background technology
Super (spy) HVDC transmission system is most emerging in recent years large-scale transmission system, with ac transmission engineering
Compare, HVDC Transmission Technology there are two main special aspects：The change of current and ground connection.Distant-range high voltage direct current transmission is returned using the earth
Road, can improve operational reliability, save electric energy loss on the line and make the engineering can be with built by separate periods, with obvious Jing
Ji benefit, therefore, except indivedual exceptions (back-to-back engineering), existing HVDC remote conveying electrical engineering is returned with the earth without exception
Road is at home and abroad widely applied as one of method of operation, direct current grounding pole.The current conversion station of HVDC transmission system
Earthing pole when system is run with monopolar ground circuit operation mode and bipolar uneven mode, play respectively guide system enter ground
The effect of electric current and out-of-balance current.D.C. high voltage transmission earthing pole can be transmitted electric power for system for a long time, improve system operation
Reliability and clamp down on current conversion station (rectifying valve) neutral point potential, it is to avoid the two poles of the earth voltage-to-ground is uneven and damage equipment.Powerful
The grounded pole injection the earth of DC current will cause pole location ground potential to raise, and step voltage, soil heating, electrode corrosion occur
Etc. new problem.
Contact potential test is an important test index of earthing pole testing experiment.Due to the electricity in two kinds of different metals
The ability that son is mutually passed through at border has difference, causes branch of the electronics on interface both sides uneven, lacks the one side band of electronics
Positive electricity, the one side of excess electron are negatively charged.After dynamic equilibrium is reached, the electrical potential difference set up in metal border is contact electricity
Gesture.In earthing pole location, electrode is generally using the corrosion-resistant material such as high-silicon chromium iron, and the hardware such as steel tower on the ground of pole location
Then generally using the material that hot rolling angle with equal legs intensity is higher, when pole location is run, can produce with ground in the hardware of pole location
Raw potential difference, when the hardware on human body touch pole location ground, can produce voltage difference on human body, make human electric shock.
Existing contact potential method of testing is as follows：DC experiment electric current is passed through into ground electrode circuit or the artificial electric current for arranging
Line injection earthing pole location, with high-accuracy voltage table measure hardware at earthing pole location away from ground it is high 1.8 meters at, with grounding body
Potential E between 1 meter Chu ground of horizontal range, according to test current and the ratio of earthing pole transient current, extrapolates earthing pole
Potential under transient current.The voltmeter adopted in test process or universal meter limited precision, it is impossible to accurate to read earthing pole location
The potential value on ground, and new error can be introduced by electric current conversion, therefore the degree of accuracy is not high.
The content of the invention
For the deficiencies in the prior art, the invention discloses a kind of contact potential test side of extra-high voltage DC grounding electrode
Method, the method for testing are not required to obtain actual contact potential using conversion, but are directly measured using rated current, as a result more accurate
Really.
Technical scheme is as follows：The contact potential method of testing of a kind of extra-high voltage DC grounding electrode, in earthing pole
Tested at the hardware of location, test ground identity distance hardware horizontal range is at 1m and vertical range is 2 points at 1.8m
Between potential difference, inject rated current in earthing pole location, the result obtained using voltmeter measurement is used as the contact potential at this
Test value, selection measure the maximum contact potential test value of hardware as the final testing result of contact potential.
The method of testing is entered during vertical grounding electrode debugging (one pole debugging) or under one pole the earth service condition
OK, tested in debugging process (one pole debugging) or under one pole the earth service condition, Injection Current can reach specified electricity
Stream, measurement result are more accurate.
The extra-high voltage direct-current voltage be ± 500kV～± 800kV, the earthing pole rated current be direct current, electric current
Size is 1800A～3200A.
Tower, drainage tower and end tower centered on the hardware of the earthing pole location.
Further, the resolution ratio >=0.1mV of the voltmeter.
The mechanism of the present invention is as follows：As existing method obtains contact potential according to the potential conversion that test current is measured,
Test current is generally less, and by taking the earthing pole of ± 500kV current conversion stations as an example, when test current is 95A, voltmeter measures result
For 519.4mV or so, and voltmeter resolution ratio >=0.1mv, and less with resolution differences due to measuring result, voltmeter exists solid
There is error, measure that result precision is not high, in addition, the potential measured under test current needs the electricity being converted under rated current
Gesture, conversion process there is also error, further result in result precision reduction.The present invention is identical in debugging process or one pole the earth
Under the conditions of, the contact potential of earthing pole, the as actual contact potential of earthing pole, test process letter are directly measured with rated current
It is single, as a result accurately.
Compared with prior art, the invention has the advantages that：The method of testing that the present invention is provided is not required to adopt and changes
Calculation obtains actual contact potential, but is directly measured using rated current, and test process is simple, as a result more accurate.
Description of the drawings
Test schematic diagrams of the Fig. 1 for contact potential；
Fig. 2 is earthing pole location metal tower distribution schematic diagram；
Fig. 3 is earthing pole location metal tower top view；
Mark in figure：1 hardware, 2 voltmeters, 3 reference electrodes, 4 central towers, 5 feed cables, 6
Polar ring, L horizontal ranges 1m, H vertical ranges 1.8m.
Specific embodiment
Technical scheme is described in further details with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
The test of contact potential is carried out in earthing pole location, and contact potential is that reflection earthing pole location component (hardware 1) exists
The potential difference that human contact's component is produced when earthing pole location is run, horizontal range L is 1m, vertical range H is what 1.8m was produced
The potential difference produced when potential difference is to simulate human contact's earthing pole location component, potential difference are measured using voltmeter 2.Contact
The test schematic diagram of potential is as shown in Figure 1.
Contact potential test request is as follows：
(1) test current for injecting earthing pole is necessary for direct current；
(2) test current for injecting earthing pole is rated current；
(3) measure ground on from hardware horizontal range be 1m place and hardware ground vertical distance above be 1.8m
Contact potential of the potential difference of place's point-to-point transmission as the component.
Contact potential test is carried out mainly for the hardware at earthing pole location, similar with the test of step voltage, is connect
The test of electric shock gesture can be tested under test current as a comparison, by the test to hardware, should be found out maximum and be connect
Tactile potential value, and by test result conversion to the contact potential value under design requirement electric current, while Maximum Contact potential should be recorded
Position.The test result of contact potential should be converted by formula (1)：The measurement under earth current In obtains contact potential Utn
Afterwards, contact potential Utc to design requirement electric current Ic is converted by formula (1).
Embodiment is using being tested using rated current under one pole terrestrial condition.
Scene contacts result to Pu'er current conversion station earthing pole, natural bridge current conversion station earthing pole wiring contact potential test
It is as follows：
Only have a central tower at the current conversion station earthing pole location of Pu'er, ground electrode circuit is entered with feed cable by central tower
Row connection, is shown in Fig. 2, has carried out contact potential test to four column foots of its central tower, see Fig. 3 in process of the test, test result is such as
Shown in table 1.
1 Pu'er current conversion station earthing pole central tower contact potential test result of table
In the case of one pole the earth, with rated current injection earthing pole location, the result for measuring is as shown in table 2.
Pu'er current conversion station earthing pole contact potential test result under 2 rated current of table
From Tables 1 and 2, the result that earth current (80A) conversion is obtained is connect with Pu'er current conversion station under rated current
Earth polar contact potential test result is compared, and due to the error in the constant error and calculating process of instrument, causes result than real
Measured value is higher by a lot, and result error is larger.
Claims (5)
1. the contact potential method of testing of a kind of extra-high voltage DC grounding electrode, it is characterised in that in the hardware of earthing pole location
Place is tested, and it is at 1m to test away from hardware horizontal range and vertical range is the potential difference at 1.8m between ground, is being connect
Rated current is injected in earth polar location, and the result obtained using voltmeter measurement selects to measure as the contact potential test value at this
The maximum contact potential test value of hardware is used as contact potential test result.
2. the contact potential method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that described
Method of testing is carried out in vertical grounding electrode debugging process or under one pole terrestrial condition.
3. the contact potential 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 voltage be ± 500kV～± 800kV, the earthing pole rated current be direct current, size of current be 1800A～
3200A。
4. the contact potential method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that described
Tower, drainage tower and end tower centered on the hardware of earthing pole location.
5. the contact potential method of testing of extra-high voltage direct-current vertical grounding electrode as claimed in claim 1, it is characterised in that described
Resolution ratio >=the 0.1mV of voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610963603.0A CN106526285A (en) | 2016-10-28 | 2016-10-28 | Contact potential testing method of ultrahigh-voltage DC grounding electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610963603.0A CN106526285A (en) | 2016-10-28 | 2016-10-28 | Contact potential testing method of ultrahigh-voltage DC grounding electrode |
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| CN106526285A true CN106526285A (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610963603.0A Pending CN106526285A (en) | 2016-10-28 | 2016-10-28 | Contact potential testing method of ultrahigh-voltage DC grounding electrode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2686322C1 (en) * | 2018-08-28 | 2019-04-25 | Глеб Германович Кравцов | Device for monitoring potential on grounding circuit of power plant |
| 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 |
| CN111815206A (en) * | 2020-08-26 | 2020-10-23 | 国网湖北省电力有限公司检修公司 | DC ground electrode electrical variable measurement system and state assessment method |
-
2016
- 2016-10-28 CN CN201610963603.0A patent/CN106526285A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 周挺 等: ""垂直型接地极在±800kV普洱换流站的应用"", 《南方电网技术》 * |
| 周禹 等: ""一种高压直流接地极现场测试方法"", 《技术与市场》 * |
| 戚迎 等: "±800 kV复龙换流站共用接地极设计特点"", 《电力建设》 * |
| 章文俊 等: ""准东—华东±1100 kV特高压送端换流站接地极及接地极线路规划"", 《电气应用》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2686322C1 (en) * | 2018-08-28 | 2019-04-25 | Глеб Германович Кравцов | Device for monitoring potential on grounding circuit of power plant |
| 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 |
| CN111815206A (en) * | 2020-08-26 | 2020-10-23 | 国网湖北省电力有限公司检修公司 | DC ground electrode electrical variable measurement system and state assessment method |
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