CN110441587A - A kind of method and system obtaining direct current grounding pole step voltage - Google Patents
A kind of method and system obtaining direct current grounding pole step voltage Download PDFInfo
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- CN110441587A CN110441587A CN201910661490.2A CN201910661490A CN110441587A CN 110441587 A CN110441587 A CN 110441587A CN 201910661490 A CN201910661490 A CN 201910661490A CN 110441587 A CN110441587 A CN 110441587A
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- direct current
- step voltage
- grounding pole
- current grounding
- pole
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Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 28
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical class [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 24
- 238000002474 experimental method Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 2
- 239000005864 Sulphur Substances 0.000 claims 2
- 229910052802 copper Inorganic materials 0.000 claims 2
- 239000010949 copper Substances 0.000 claims 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 229910000365 copper sulfate Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a kind of method and system for obtaining direct current grounding pole step voltage, belong to Grounding Technology of Modern Power System field.The method of the present invention includes: to establish the test loop for obtaining direct current grounding pole step voltage；The Constant Direct Current electric current I positive to direct current grounding pole injection connects a pair of of copper/saturated copper sulphate reference electrode using voltmeter and measures forward dc earthing pole step voltage V1；Reversed Constant Direct Current electric current-I is injected to direct current grounding pole, measures reversed direct current grounding pole step voltage V using voltmeter and a pair of of copper/saturated copper sulphate reference electrode2；According to V1And V2Obtain step voltage actual value V.The present invention can reduce the interference that background voltage tests direct current grounding pole step voltage, and compared to directly measuring to direct current grounding pole step voltage, measurement result of the present invention is more accurate.Experiment process is succinct, easy to operate.
Description
Technical field
The present invention relates to Grounding Technology of Modern Power System fields, and more particularly, to a kind of acquisition direct current grounding pole across
Walk the method and system of voltage.
Background technique
An important component of the direct current grounding pole as DC transmission engineering, carries the monopole of kilo-ampere is big
Ground running current imports safely the effect of the earth.Huge DC current from earthing pole it is wandering after, can be generated near the location of pole
Certain step voltage distribution.Before direct current grounding pole puts into operation, need to carry out the check test of step voltage, assessment connects
Safety of the earth polar earth current to pole location periphery person poultry activity.
Before system electrification debugging, step voltage test can not be carried out using the big earth current of direct current system.It can only adopt
With the DC experiment power supply provided for oneself to earthing pole location injection testing electric current, due to the limitation of plant capacity, number can only be often injected
Ten amperes of electric current.Under the electric current of the magnitude, the step voltage of generation often only has more than ten millivolts to tens of millivolts, and strides
The uneven polarization potential of reference electrode used in voltage tester itself and background interference in ground substantially in the same order of magnitude,
So that noise is relatively low, there are biggish errors for the step voltage value tested.There is an urgent need to find a kind of reduction background electricity
It press dry and disturbs, the method for improving the precision of step voltage test data.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of methods for obtaining direct current grounding pole step voltage, comprising:
Establish the test loop for obtaining direct current grounding pole step voltage；
The Constant Direct Current electric current I positive to direct current grounding pole injection connects a pair of of copper/saturated copper sulphate reference using voltmeter
Electrode measurement forward dc earthing pole step voltage V1；
Reversed Constant Direct Current electric current-I is injected to direct current grounding pole, uses voltmeter and a pair of of copper/saturated copper sulphate reference electricity
Pole measures reversed direct current grounding pole step voltage V2；
According to V1And V2Obtain step voltage actual value V.
Optionally, test loop, comprising: experiment power supply, single-pole double-throw switch (SPDT), direct current grounding pole route, converter station ground connection
Net and direct current grounding pole；
The experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened by single-pole double throw
Light uses direct current grounding pole connection direct current grounding pole.
Optionally, a pair of of copper/saturated copper sulphate reference electrode polarization potential difference is not more than 5mV.
Optionally, the distance range of a pair of of copper/saturated copper sulphate reference electrode is greater than or equal to 1m and connects perpendicular to the ground with ground
Touching.
Optionally, step voltage actual value V is obtained, is specifically included: if background voltage is V0, then have:
V1=V+V0 (1)
V2=-V+V0 (2)
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。 (3)
The invention also provides a kind of systems for obtaining direct current grounding pole step voltage, comprising:
It determines return circuit module, establishes the test loop for obtaining direct current grounding pole step voltage；
First measurement module, the Constant Direct Current electric current I positive to direct current grounding pole injection are connected a pair of full using voltmeter
Forward dc earthing pole step voltage V is measured with copper sulfate reference electrode1；
Second measurement module injects reversed Constant Direct Current electric current-I to direct current grounding pole, full using voltmeter and a pair
Reversed direct current grounding pole step voltage V is measured with copper sulfate reference electrode2；
Step voltage module is obtained, according to V1And V2Obtain step voltage actual value V.
Optionally, test loop, comprising: experiment power supply, single-pole double-throw switch (SPDT), direct current grounding pole route, converter station ground connection
Net and direct current grounding pole；
The experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened by single-pole double throw
Light uses direct current grounding pole connection direct current grounding pole.
Optionally, a pair of of copper/saturated copper sulphate reference electrode polarization potential difference is not more than 5mV.
Optionally, the distance range of a pair of of copper/saturated copper sulphate reference electrode is greater than or equal to 1m and connects perpendicular to the ground with ground
Touching.
Optionally, step voltage actual value V is obtained, is specifically included: if background voltage is V0, then have:
V1=V+V0
V2=-V+V0
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。
The present invention injects the test current of positive and negative both direction same size to direct current grounding pole, to positive and negative beam twice
The step voltage measurement result of test carries out operation, without measuring to background voltage, so that it may obtain step voltage value.
The present invention can reduce the interference that background voltage tests direct current grounding pole step voltage, compared to directly connecing to direct current
Earth polar step voltage measures, and measurement result of the present invention is more accurate.Experiment process is succinct, easy to operate.
Detailed description of the invention
Fig. 1 is a kind of method flow diagram for obtaining direct current grounding pole step voltage of the present invention；
Fig. 2 is a kind of method test loop diagram for obtaining direct current grounding pole step voltage of the present invention:
Fig. 3 is a kind of method step voltage test schematic diagram for obtaining direct current grounding pole step voltage of the present invention；
Fig. 4 is a kind of system construction drawing for obtaining direct current grounding pole step voltage of the present invention；
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
The present invention provides a kind of methods for obtaining direct current grounding pole step voltage, as shown in Figure 1, comprising:
The test loop for obtaining direct current grounding pole step voltage is established, test loop is as shown in Figure 2, comprising: experiment power supply,
Single-pole double-throw switch (SPDT), direct current grounding pole route, converter station grounded screen and direct current grounding pole；
Experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened the light by single-pole double throw to be made
With direct current grounding pole connection direct current grounding pole.
DC power supply is placed in converter station, to direct current grounding pole inject Constant Direct Current electric current, using converter station grounded screen as
Reflux pole constitutes test loop.1 is double-point double-throw switch, and wherein cd is input terminal, and ab, ef are output end, and s is movable disconnecting link
Piece.When disconnecting link s is incorporated into the end ef, DC power supply injects forward current to direct current grounding pole；When disconnecting link s is incorporated into the end ab, direct current
Power supply injects reverse current to direct current grounding pole.
The Constant Direct Current electric current I positive to direct current grounding pole injection connects a pair of of copper/saturated copper sulphate reference using voltmeter
Electrode measurement forward dc earthing pole step voltage V1；
Reversed Constant Direct Current electric current-I is injected to direct current grounding pole, uses voltmeter and a pair of of copper/saturated copper sulphate reference electricity
Pole measures reversed direct current grounding pole step voltage V2；
The distance range of a pair of of copper/saturated copper sulphate reference electrode be greater than or equal to 1m and perpendicular to the ground with ground face contact；
As shown in figure 3,2 be a pair of of copper sulfate reference electrode, the polarization potential difference of reference electrode is not more than 5mV；3 be voltage
Table；When testing step voltage, directly distance is greater than or equal to 1m and well contacts with ground, voltmeter reading two reference electrodes
Number is the step voltage between two electrodes.
According to V1And V2Obtain step voltage actual value V.
Optionally, step voltage actual value V is obtained, is specifically included: if background voltage is V0, then have:
V1=V+V0 (1)
V2=-V+V0 (2)
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。 (3)
The invention also provides a kind of systems 200 for obtaining direct current grounding pole step voltage, as shown in Figure 4, comprising:
It determines return circuit module 201, establishes the test loop for obtaining direct current grounding pole step voltage；Test loop, comprising: examination
Electrical verification source, single-pole double-throw switch (SPDT), direct current grounding pole route, converter station grounded screen and direct current grounding pole；
The experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened by single-pole double throw
Light uses direct current grounding pole connection direct current grounding pole.
First measurement module 202, the Constant Direct Current electric current I positive to direct current grounding pole injection, uses voltmeter connection one
Forward dc earthing pole step voltage V is measured to copper/saturated copper sulphate reference electrode1；
Second measurement module 203 injects reversed Constant Direct Current electric current-I to direct current grounding pole, uses voltmeter and a pair
Copper/saturated copper sulphate reference electrode measures reversed direct current grounding pole step voltage V2；A pair of of copper/saturated copper sulphate reference electrode polarization potential
Difference is not more than 5mV；The distance range of a pair of of copper/saturated copper sulphate reference electrode be greater than or equal to 1m and perpendicular to the ground with ground face contact.
Step voltage module 204 is obtained, according to V1And V2Obtain step voltage actual value V.
Step voltage actual value V is obtained, is specifically included: if background voltage is V0, then have:
V1=V+V0
V2=-V+V0
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。
The present invention injects the test current of positive and negative both direction same size to direct current grounding pole, to positive and negative beam twice
The step voltage measurement result of test carries out operation, without measuring to background voltage, so that it may obtain step voltage value.
The present invention can reduce the interference that background voltage tests direct current grounding pole step voltage, compared to directly connecing to direct current
Earth polar step voltage measures, and measurement result of the present invention is more accurate.Experiment process is succinct, easy to operate.
Claims (10)
1. a kind of method for obtaining direct current grounding pole step voltage, which comprises
Establish the test loop for obtaining direct current grounding pole step voltage；
The Constant Direct Current electric current I positive to direct current grounding pole injection connects a pair of of copper/saturated copper sulphate reference electrode using voltmeter
Measure forward dc earthing pole step voltage V1；
Reversed Constant Direct Current electric current-I is injected to direct current grounding pole, is surveyed using voltmeter and a pair of of copper/saturated copper sulphate reference electrode
Measure reversed direct current grounding pole step voltage V2；
According to V1And V2Obtain step voltage actual value V.
2. according to the method described in claim 1, the test loop, comprising: experiment power supply, single-pole double-throw switch (SPDT), direct current
Ground electrode circuit, converter station grounded screen and direct current grounding pole；
The experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened the light by single-pole double throw to be made
With direct current grounding pole connection direct current grounding pole.
3. according to the method described in claim 1, a pair of of copper/saturated copper sulphate reference electrode polarization potential difference is not more than
5mV。
4. according to the method described in claim 1, the distance range of a pair of of copper/saturated copper sulphate reference electrode is greater than or waits
In 1m and perpendicular to the ground with ground face contact.
5. according to the method described in claim 1, the acquisition step voltage actual value V, specifically includes: if background voltage is
V0, then have:
V1=V+V0 (1)
V2=-V+V0 (2)
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。 (3)
6. a kind of system for obtaining direct current grounding pole step voltage, the system comprises:
It determines return circuit module, establishes the test loop for obtaining direct current grounding pole step voltage；
First measurement module, the Constant Direct Current electric current I positive to direct current grounding pole injection connect a pair of of saturation sulphur using voltmeter
Sour copper reference electrode measures forward dc earthing pole step voltage V1；
Second measurement module injects reversed Constant Direct Current electric current-I to direct current grounding pole, uses voltmeter and a pair of of saturation sulphur
Sour copper reference electrode measures reversed direct current grounding pole step voltage V2；
Step voltage module is obtained, according to V1And V2Obtain step voltage actual value V.
7. system according to claim 6, the test loop, comprising: experiment power supply, single-pole double-throw switch (SPDT), direct current
Ground electrode circuit, converter station grounded screen and direct current grounding pole；
The experiment power supply connects converter station grounded screen by single-pole double-throw switch (SPDT) one end, and the other end is opened the light by single-pole double throw to be made
With direct current grounding pole connection direct current grounding pole.
8. system according to claim 6, a pair of of copper/saturated copper sulphate reference electrode polarization potential difference is not more than
5mV。
9. the distance range of system according to claim 6, a pair of of copper/saturated copper sulphate reference electrode is greater than or waits
In 1m and perpendicular to the ground with ground face contact.
10. system according to claim 6, the acquisition step voltage actual value V, specifically include: if background voltage
For V0, then have:
V1=V+V0
V2=-V+V0
According to formula (1) and formula (2), then have:
V=(V1-V2)/2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910661490.2A CN110441587A (en) | 2019-07-22 | 2019-07-22 | A kind of method and system obtaining direct current grounding pole step voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910661490.2A CN110441587A (en) | 2019-07-22 | 2019-07-22 | A kind of method and system obtaining direct current grounding pole step voltage |
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| CN110441587A true CN110441587A (en) | 2019-11-12 |
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2019
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