CN108666958A - Direct-current power transmission system with grounding electrode line ice melting function and operation method thereof - Google Patents
Direct-current power transmission system with grounding electrode line ice melting function and operation method thereof Download PDFInfo
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- CN108666958A CN108666958A CN201710197717.3A CN201710197717A CN108666958A CN 108666958 A CN108666958 A CN 108666958A CN 201710197717 A CN201710197717 A CN 201710197717A CN 108666958 A CN108666958 A CN 108666958A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 72
- 238000002844 melting Methods 0.000 title claims abstract description 14
- 230000008018 melting Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 14
- 239000004020 conductor Substances 0.000 claims abstract description 38
- 230000005611 electricity Effects 0.000 claims description 41
- 230000008859 change Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000006855 networking Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention relates to a direct current transmission system with an earth electrode line ice melting function. By disconnecting the seventh knife switch, closing the eighth knife switch and disconnecting the second knife switch, and closing the third knife switch, the fourth knife switch and the third breaker, the other one of the two-phase conductors can be connected with the first pole converter valve group and the first pole transmission line, one section of the two-phase conductor provided with the seventh knife switch is connected with the second pole converter valve group and the second pole transmission line and is connected with the other one of the two-phase conductors, so that direct current passes through the two-phase conductors of the grounding electrode line after the high-voltage direct-current transmission system is started, the direct current is larger than the single-phase minimum ice melting current in the two-phase conductors of the grounding electrode line and smaller than the single-phase maximum allowable current in the two-phase conductors of the grounding electrode line, and ice continuously running until the grounding electrode line completely falls off. The system is simple in structure and can meet the requirement of deicing of the grounding electrode circuit.
Description
Technical field
The present invention relates to high-voltage dc transmission electrical domains, more particularly to a kind of direct current with ground electrode circuit ice-melt function
Transmission system and its operation method.
Background technology
In the various natural calamities that electric system is subjected to, ice damage is one of threat of most serious.In recent years, all kinds of gas in the whole world
As disaster is more frequent, the more aobvious exception of Extreme Weather-climate Events, ice damage cause the loss of electric system and influence it is more serious,
It is also increasing to the reply difficulty of ice damage so as to cause electric system.
D.C. high voltage transmission (HVDC, High Voltage Direct Current Transmission) is held due to conveying
Amount is big and loss is small, power regulation flexibility and reliability, there is no non-between the stable problem of synchronous operation, achievable electric system
The advantages that synchronous networking, the transmission of electricity of remote high-capacity direct current, back-to-back DC networking, gorge direct current submarine cable over strait transmission of electricity,
Ac and dc systems series-parallel connection etc. is obtained for extensive use.
DC transmission system ice-melt control model：Subtract to make the electric current flowed through in DC line increase in icing season
Mitigation prevents circuit from freezing, the operational mode controlled using DC ice melting.Whether the purpose can be reached, depend on DC current
Whether the guarantor line current or ice melting current of DC line can be reached.DC ice melting control operational mode include：Overload
Operation, the incorgruous transmission of the two poles of the earth power, single current conversion station the two poles of the earth back-to-back running, double 12 flutter valve sets in parallel operation etc..
Bipolar HVDC system uses bipolar balance movement mode, and ground electrode circuit no current is logical when normal operation
It crosses, is more easy to freeze in the icing phase.Although the monopolar ground return method of operation theoretically may be used to melt ground electrode circuit
Ice, but limited by many factors, when the Practical Project mesohigh DC transmission system monopolar ground return method of operation allows operation
Between it is very short, cannot be satisfied ice-melt needs.
Invention content
Based on this, it is necessary to provide a kind of DC transmission system disclosure satisfy that ground electrode circuit ice-melt demand and its operation
Method.
A kind of DC transmission system with ground electrode circuit ice-melt function, including the first pole change of current valve group, the second pole are changed
Valve group, the first pole transmission line of electricity and the second pole transmission line of electricity and ground electrode circuit；The first end connection of valve group is changed in first pole
In one end of first pole transmission line of electricity；The first end that valve group is changed in second pole is connected to second pole transmission line of electricity
One end；The second end of the first pole change of current valve group is connect by the first breaker and the first disconnecting link with the ground electrode circuit；
The second end of the second pole change of current valve group is connect by the second breaker and the second disconnecting link with the ground electrode circuit；It is described double
Extra-high voltage DC transmission system further includes third breaker, third disconnecting link, the 4th disconnecting link；The first end of the third disconnecting link connects
Between second disconnecting link and second breaker, the second end of the third disconnecting link and the first of the third breaker
End connection；The second end of the third breaker is connect with the first end of the 4th disconnecting link；
The ground electrode circuit includes the 4th breaker, the 5th disconnecting link, the 6th disconnecting link, the 7th disconnecting link, the 8th disconnecting link and two
Phase conductor；The first end of 5th disconnecting link is connected between first disconnecting link and second disconnecting link, the 5th disconnecting link
Second end connect with the first end of the 4th breaker, the of the second end of the 4th breaker and the 6th disconnecting link
One end connects, and the second end of the 6th disconnecting link is connect with the first end of two phase conductor, the second end of two phase conductor
Ground connection；7th disconnecting link is arranged in the wherein phase in two phase conductor, and the first end of the 7th disconnecting link connects institute
State the second end of the 6th disconnecting link；The first end of 8th disconnecting link connects the second end of the 7th disconnecting link, the 8th disconnecting link
Second end connect the second end of the 4th disconnecting link.
In another embodiment, bipolar HVDC system further includes the first connecting line；First connecting line
First end connect first pole transmission line of electricity, second end connect second pole transmission line of electricity；On first connecting line
It is provided with the 9th disconnecting link and the tenth disconnecting link；The first end of 9th disconnecting link connects first pole transmission line of electricity；Described 9th
The second end of disconnecting link connects the second end of the 4th disconnecting link；The first end setting of tenth disconnecting link in the 8th disconnecting link and
Between 4th disconnecting link；The second end of tenth disconnecting link connects second pole transmission line of electricity.
In another embodiment, bipolar HVDC system further includes the 5th breaker and the 11st disconnecting link；Institute
The first end ground connection of the 5th breaker is stated, second end connects the first end of the 11st disconnecting link；The of 11st disconnecting link
Two ends are connected between first disconnecting link and the 5th disconnecting link.
In another embodiment, bipolar HVDC system further includes the 12nd disconnecting link, and first end is connected to
Between the third disconnecting link and the third breaker；The second end of 12nd disconnecting link be connected to first breaker and
Between first disconnecting link.
In another embodiment, bipolar HVDC system further includes the 13rd disconnecting link, the 13rd disconnecting link
First end connect with the first end of the 5th disconnecting link；The second end of 13rd disconnecting link be connected to the 6th disconnecting link and
Between 7th disconnecting link.
In another embodiment, bipolar HVDC system further includes being arranged in first pole transmission line of electricity
14th disconnecting link.
In another embodiment, bipolar HVDC system further includes being arranged in second pole transmission line of electricity
15th disconnecting link.
A kind of operation method of bipolar HVDC system, includes the following steps：
The 7th disconnecting link is disconnected, the 8th disconnecting link is closed；
Second disconnecting link is disconnected, the third disconnecting link, the 4th disconnecting link and the third breaker are closed；
Confirm the 9th disconnecting link, the tenth disconnecting link, the 11st disconnecting link, the 12nd disconnecting link and the described tenth
Three disconnecting links are off；
Confirm first disconnecting link, the 5th disconnecting link, the 6th disconnecting link, the 14th disconnecting link, the described 15th
Disconnecting link, first breaker, second breaker and the 4th breaker are in closed state.
Start the bipolar HVDC system according to the bipolar method of operation, DC current is more than ground electrode circuit one
The minimum ice melting current of phase conductor, and less than the maximum allowed current of one phase conductor of ground electrode circuit, continue to run until earthing pole
The ice of circuit all falls off.
The above-mentioned DC transmission system and its operation method with ground electrode circuit ice-melt function, by ground connection polar curve
The 8th disconnecting link that the 7th disconnecting link is set in a wherein phase in two phase conductors on road and is connect with the 7th disconnecting link, the 7th disconnecting link
First end connects the second end of the 6th disconnecting link；The first end of 8th disconnecting link connects the second end of the 7th disconnecting link, and the of the 8th disconnecting link
Two ends connect the second end of the 4th disconnecting link, thus, by disconnecting the 7th disconnecting link, can make in two phase conductors another is connected
First pole change of current valve group and the first pole transmission line of electricity can make two phase conductors be provided with the 7th disconnecting link by being closed the 8th disconnecting link
Valve group and the second pole transmission line of electricity are changed in wherein one section of that phase the second pole of connection, and are connected with another in two phase conductors,
To make two phase lines for having DC current to pass through ground electrode circuit after starting HVDC transmission system, and DC current is big
In the minimum ice melting current of one phase conductor of ground electrode circuit, and less than the maximum allowed current of one phase conductor of ground electrode circuit, hold
The ice of reforwarding row to ground electrode circuit all falls off.The bipolar HVDC system is simple in structure, disclosure satisfy that earthing pole
The needs of line ice-melting.
Description of the drawings
Fig. 1 is a kind of wiring schematic diagram of the DC transmission system with ground electrode circuit ice-melt function of embodiment；
Fig. 2 is the DC transmission system with ground electrode circuit ice-melt function as shown in Figure 1 to earthing pole line ice-melting
When current loop schematic diagram.
Specific implementation mode
As shown in Figure 1, a kind of DC transmission system with ground electrode circuit ice-melt function, including the first pole change of current valve group
11, valve group 12, the first pole transmission line of electricity 21 and the second pole transmission line of electricity 22 are changed in the second pole.In the particular embodiment, the first pole
Transmission line of electricity 21 is positive transmission line of electricity, and the second pole transmission line of electricity 22 is cathode transmission line of electricity.
The first end that valve group 11 is changed in first pole is connected to one end of the first pole transmission line of electricity 21；The of valve group 12 is changed in second pole
One end is connected to one end of the second pole transmission line of electricity 22；The second end of first pole change of current valve group 11 passes through the first breaker 31 and
One disconnecting link 401 is connect with ground electrode circuit 23；The second end of second pole change of current valve group 12 passes through the second breaker 32 and the second knife
Lock 402 is connect with ground electrode circuit 23.
Bipolar HVDC system further includes third breaker 33, third disconnecting link 403, the 4th disconnecting link 404；Third knife
The first end of lock 403 is connected between the second disconnecting link 402 and the second breaker 32, and the second end and third of third disconnecting link 403 are disconnected
The first end of road device 33 connects；The second end of third breaker 33 is connect with the first end of the 4th disconnecting link 404.
Ground electrode circuit 23 includes the 4th breaker 34, the 5th disconnecting link 405, the 6th disconnecting link 406, the 7th disconnecting link the 407, the 8th
Disconnecting link 408 and two phase conductors 231；The first end of 5th disconnecting link 405 is connected between the first disconnecting link 401 and the second disconnecting link 402, the
The second end of five disconnecting links 405 is connect with the first end of the 4th breaker 34, second end and the 6th disconnecting link 406 of the 4th breaker 34
First end connection, the second end of the 6th disconnecting link 406 connect with the first end of two phase conductors 231, the second end of two phase conductors 231
Ground connection；7th disconnecting link 407 is arranged in a wherein phase for two phase conductors 231, and the first end of the 7th disconnecting link 407 connects the 6th disconnecting link
406 second end；The first end of 8th disconnecting link 408 connects the second end of the 7th disconnecting link 407, and the second end of the 8th disconnecting link 408 connects
Connect the second end of the 4th disconnecting link 404.
Further, bipolar HVDC system further includes the first connecting line 51；The first end of first connecting line 51
The first pole transmission line of electricity 21 is connected, second end connects the second pole transmission line of electricity 22；It is provided with the 9th disconnecting link on first connecting line 51
409 and the tenth disconnecting link 410；The first end of 9th disconnecting link 409 connects the first pole transmission line of electricity 21；The second end of 9th disconnecting link 409
Connect the second end of the 4th disconnecting link 404；The first end setting of tenth disconnecting link 410 the 8th disconnecting link 408 and the 4th disconnecting link 404 it
Between；The second end of tenth disconnecting link 410 connects the second pole transmission line of electricity 22.
Further, bipolar HVDC system further includes the 5th breaker 35 and the 11st disconnecting link 411；5th is disconnected
The first end of road device is grounded, and second end connects the first end of the 11st disconnecting link 411；The second end of 11st disconnecting link 411 is connected to
Between first disconnecting link 401 and the 5th disconnecting link 405.
Further, bipolar HVDC system further includes the 12nd disconnecting link 412, and first end is connected to third knife
Between lock 403 and third breaker 33；The second end of 12nd disconnecting link 412 is connected to the first breaker 31 and the first disconnecting link 401
Between.
Further, bipolar HVDC system further includes the 13rd disconnecting link 413, and the first of the 13rd disconnecting link 413
End is connect with the first end of the 5th disconnecting link 405；The second end of 13rd disconnecting link 413 is connected to the 6th disconnecting link 406 and the 7th disconnecting link
Between 407.
Further, bipolar HVDC system further includes the 14th disconnecting link being arranged in the first pole transmission line of electricity 21
414, and the 15th disconnecting link 415 in the second pole transmission line of electricity 22 is set.
When needing to carry out ice-melt work, concrete operations are as follows：
1, under bipolar HVDC system stoppage in transit operating mode, the 7th disconnecting link 407 is disconnected, is closed the 8th disconnecting link 408, is broken
The second disconnecting link 402 is opened, third disconnecting link 403, the 4th disconnecting link 404 and third breaker 33 are closed；
2, confirm the 9th disconnecting link 409, the tenth disconnecting link 410, the 12nd disconnecting link 412, the 13rd disconnecting link 413, the 5th breaker
35 and the 11st disconnecting link 411 disconnects；
3, confirm that the first disconnecting link 401, the 5th disconnecting link 405, the 6th disconnecting link 406 and the 4th breaker 34 are closed.
4, start HVDC transmission system according to the bipolar method of operation.
Access schematic diagram when the bipolar HVDC system is run is as shown in Fig. 2, by ground electrode circuit
The 8th disconnecting link that the 7th disconnecting link is set in a wherein phase in two phase conductors and is connect with the 7th disconnecting link, the first of the 7th disconnecting link
End connects the second end of the 6th disconnecting link；The first end of 8th disconnecting link connects the second end of the 7th disconnecting link, described
The second end of 8th disconnecting link connects the second end of the 4th disconnecting link, thus, by disconnecting the 7th disconnecting link, two-phase can be made to lead
Another be connected the first pole change of current valve group and the first pole transmission line of electricity in line can make two phase conductors by being closed the 8th disconnecting link
Valve group and the second pole transmission line of electricity are changed in wherein one section of that phase provided with the 7th disconnecting link the second pole of connection, and with two phase conductors
In it is another be connected, to make the two-phase for thering is DC current to pass through ground electrode circuit after starting HVDC transmission system lead
Line, and DC current is more than the minimum ice melting current of two phase conductor of ground electrode circuit, and it is less than one phase conductor of ground electrode circuit
Maximum allowed current, continue to run until that the ice of ground electrode circuit all falls off.The bipolar HVDC system structure letter
It is single, it disclosure satisfy that the needs of ground electrode circuit ice-melt.
It is understood that in double-end double pole DC transmission system, include the bipolar high voltage direct current of two above structures
Transmission system, the two are connected by the first pole transmission line of electricity and the second pole transmission line of electricity.
With the bipolar HVDC engineering grounding electrode electric line ice-melting of ± a 500kV, specified transmission power 3000MW
For, it verifies with ground electrode circuit de-icing method proposed by the present invention.
The high voltage direct current transmission project ground electrode circuit uses two-phase conductor structure, is double splitted constructions per phase conductor, leads
Line model LGJ-720/50, it is 500mm that sub-conductor, which divides spacing,.Two phase conductors are respectively arranged in shaft tower both sides.Table 1 gives
The major parameter of ground electrode circuit, table 2 give ice-melt parameter of two phase conductors (2 × ACSR-720/50) under typical condition.
The rated current of bipolar HVDC engineering is 3000A, meets ground electrode circuit ice-melt needs.
1 ground electrode circuit major parameter of table
Table 22 × ACSR-720/50 ice-melt parameters
When needing to carry out ice-melt work, concrete operations are as follows：
1, under bipolar HVDC system stoppage in transit operating mode, the 7th disconnecting link 407 of disconnection, the 8th disconnecting link 408 of closure, 2,
The second disconnecting link 402 is disconnected, third disconnecting link 403, the 4th disconnecting link 404 and third breaker 33 are closed；
2, confirm the 9th disconnecting link 409, the tenth disconnecting link 410, the 12nd disconnecting link 412, the 13rd disconnecting link 413, the 5th breaker
35 and the 11st disconnecting link 411 disconnects；
3, confirm the 9th disconnecting link 409, the tenth disconnecting link 410, the 11st disconnecting link 411, the 12nd disconnecting link 412 and the 13rd disconnecting link
413 are off；
4, confirm the first disconnecting link 401, the 5th disconnecting link 405, the 6th disconnecting link 406, the 14th disconnecting link 414, the 15th disconnecting link
415, the first breaker 31, the second breaker 32 and the 4th breaker 34 are in closed state；
5, start HVDC transmission system according to the bipolar method of operation so that DC current 2800A is more than ground connection
The minimum ice melting current 2627A of two phase conductor of polar curve road, and less than the maximum allowed current of two phase conductor of ground electrode circuit
3416A, as shown in Fig. 2, continuous service about 1 hour, the icing on ground electrode circuit will all fall off current path.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of DC transmission system with ground electrode circuit ice-melt function, including the first pole change of current valve group, the second pole change valve
Group, the first pole transmission line of electricity and the second pole transmission line of electricity and ground electrode circuit；The first end that valve group is changed in first pole is connected to
One end of first pole transmission line of electricity；The first end that valve group is changed in second pole is connected to the one of second pole transmission line of electricity
End；The second end of the first pole change of current valve group is connect by the first breaker and the first disconnecting link with the ground electrode circuit；Institute
The second end for stating the second pole change of current valve group is connect by the second breaker and the second disconnecting link with the ground electrode circuit；Its feature exists
In the bipolar HVDC system further includes third breaker, third disconnecting link, the 4th disconnecting link；The third disconnecting link
First end is connected between second disconnecting link and second breaker, and the second end and the third of the third disconnecting link are disconnected
The first end of road device connects；The second end of the third breaker is connect with the first end of the 4th disconnecting link；
The ground electrode circuit is led including the 4th breaker, the 5th disconnecting link, the 6th disconnecting link, the 7th disconnecting link, the 8th disconnecting link and two-phase
Line；The first end of 5th disconnecting link is connected between first disconnecting link and second disconnecting link, and the of the 5th disconnecting link
Two ends are connect with the first end of the 4th breaker, the first end of the second end and the 6th disconnecting link of the 4th breaker
Connection, the second end of the 6th disconnecting link are connect with the first end of two phase conductor, the second end ground connection of two phase conductor；
7th disconnecting link is arranged in the wherein phase in two phase conductors of double divisions, and the first end of the 7th disconnecting link connects institute
State the second end of the 6th disconnecting link；The first end of 8th disconnecting link connects the second end of the 7th disconnecting link, the 8th disconnecting link
Second end connect the second end of the 4th disconnecting link.
2. bipolar HVDC system according to claim 1, which is characterized in that further include the first connecting line；Institute
First end connection first pole transmission line of electricity of the first connecting line is stated, second end connects second pole transmission line of electricity；It is described
The 9th disconnecting link and the tenth disconnecting link are provided on first connecting line；The first end of 9th disconnecting link connects first pole power transmission line
Road；The second end of 9th disconnecting link connects the second end of the 4th disconnecting link；The first end of tenth disconnecting link is arranged in institute
It states between the 8th disconnecting link and the 4th disconnecting link；The second end of tenth disconnecting link connects second pole transmission line of electricity.
3. according to claim 1 any one of them bipolar HVDC system, which is characterized in that further include the 5th open circuit
Device and the 11st disconnecting link；The first end of 5th breaker is grounded, and second end connects the first end of the 11st disconnecting link；Institute
The second end for stating the 11st disconnecting link is connected between first disconnecting link and the 5th disconnecting link.
4. bipolar HVDC system according to claim 3, which is characterized in that further include the 12nd disconnecting link,
First end is connected between the third disconnecting link and the third breaker；The second end of 12nd disconnecting link is connected to described
Between first breaker and the first disconnecting link.
5. bipolar HVDC system according to claim 1, which is characterized in that further include the 13rd disconnecting link, institute
The first end for stating the 13rd disconnecting link is connect with the first end of the 5th disconnecting link；The second end of 13rd disconnecting link is connected to institute
It states between the 6th disconnecting link and the 7th disconnecting link.
6. bipolar HVDC system according to claim 1, which is characterized in that further include being arranged described first
14th disconnecting link of pole transmission line of electricity.
7. bipolar HVDC system according to claim 1, which is characterized in that further include being arranged described second
15th disconnecting link of pole transmission line of electricity.
8. a kind of operation side of the DC transmission system with ground electrode circuit ice-melt function of any one of such as claim 1 to 7
Method, which is characterized in that include the following steps：
The 7th disconnecting link is disconnected, the 8th disconnecting link is closed；
Second disconnecting link is disconnected, the third disconnecting link, the 4th disconnecting link and the third breaker are closed；
Confirm the 9th disconnecting link, the tenth disconnecting link, the 11st disconnecting link, the 12nd disconnecting link and the 13rd knife
Lock is off；
Confirm first disconnecting link, the 5th disconnecting link, the 6th disconnecting link, the 14th disconnecting link, the 15th disconnecting link,
First breaker, second breaker and the 4th breaker are in closed state；
Start the bipolar HVDC system according to the bipolar method of operation, DC current is led more than one phase of ground electrode circuit
The minimum ice melting current of line, and less than the maximum allowed current of one phase conductor of ground electrode circuit, continue to run until ground electrode circuit
Ice all fall off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197717.3A CN108666958A (en) | 2017-03-29 | 2017-03-29 | Direct-current power transmission system with grounding electrode line ice melting function and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197717.3A CN108666958A (en) | 2017-03-29 | 2017-03-29 | Direct-current power transmission system with grounding electrode line ice melting function and operation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108666958A true CN108666958A (en) | 2018-10-16 |
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ID=63786161
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710197717.3A Pending CN108666958A (en) | 2017-03-29 | 2017-03-29 | Direct-current power transmission system with grounding electrode line ice melting function and operation method thereof |
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| CN (1) | CN108666958A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271681A (en) * | 2020-10-27 | 2021-01-26 | 中国电力工程顾问集团中南电力设计院有限公司 | Leading structure of direct-current ground wire ice melting power supply of extra-high voltage multi-terminal direct-current converter station |
-
2017
- 2017-03-29 CN CN201710197717.3A patent/CN108666958A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271681A (en) * | 2020-10-27 | 2021-01-26 | 中国电力工程顾问集团中南电力设计院有限公司 | Leading structure of direct-current ground wire ice melting power supply of extra-high voltage multi-terminal direct-current converter station |
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