CN108376976A - The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term - Google Patents
The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term Download PDFInfo
- Publication number
- CN108376976A CN108376976A CN201810249219.3A CN201810249219A CN108376976A CN 108376976 A CN108376976 A CN 108376976A CN 201810249219 A CN201810249219 A CN 201810249219A CN 108376976 A CN108376976 A CN 108376976A
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- Prior art keywords
- direct current
- conversion station
- protecting
- current conversion
- short
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
An embodiment of the present invention provides a kind of direct current protecting definite value of multi-terminal direct current transmission system switching method and devices in short-term,Determine whether this current conversion station is failure current conversion station by the way that the action in the selective direct current protecting of the direct current protecting device of this current conversion station is arranged first,When it is failure current conversion station to determine this current conversion station,The dc circuit breaker for controlling this current conversion station disconnects isolated fault region,And send direct current protecting definite value switching command in short-term by communicating other current conversion stations into multi-terminal direct current transmission system between the station between current conversion station,So that other current conversion stations judge the time according to the action of the direct current protecting definite value non-selective direct current protecting that switching command improves the direct current protecting device of itself in preset duration in short-term,Original definite value is restored to after short time,Interference for electrical quantity during escaping failure,Avoid non-faulting station protection act stoppage in transit current conversion station,To ensure that non-faulting current conversion station continues even running.
Description
Technical field
The invention belongs to Multi-end flexible direct current transmission system control protection technique field, more particularly to a kind of multiterminal element is defeated
The direct current protecting definite value of electric system switching method and device in short-term.
Background technology
Importance of the flexible direct current power transmission system in direct current transportation field is increasingly enhanced, multi-terminal system (i.e. Installed System Memory
In multiple current conversion stations) the characteristics of can more embodying flexible transmission of electricity, but the startup control of multi-terminal system is necessarily faced in engineer application
And critical problem urgently to be resolved hurrily.
The originally design of the three-terminal flexible direct-current power transmission system of early stage does not connect in DC line, bus rod or direct current pole busbar
Connect the disjunction equipment that fault current can be cut off in place's installing, after a certain DC system fault, can not isolated fault region, can only take
The strategy that three stations are all stopped transport, that is, be latched three station converter valves and three station inlet wire alternating-current switch of tripping.
In order to improve MTDC transmission system operation flexibility and reliability, can by install additional dc circuit breaker excision and every
From fault point, realizes the online input at third station, exits online and Fault Isolation.
In order to realize to some current conversion station Fault Isolation, dc circuit breaker can be mounted on to the current conversion station to bus rod
Place.When the DC line of the current conversion station and the current conversion station break down, acted by selective direct current protecting to differentiate event
Hinder position, tripping dc circuit breaker, to realize the electrical isolation of the current conversion station and DC line and other two stations.But due to
MTDC transmission system circuit is shorter, and system inertia is small, and when a certain current conversion station breaks down, the electrical quantity of other current conversion stations has aobvious
Write variation, it is possible that dc circuit breaker does not have enough time being isolated the current conversion station of the failure also, other current conversion stations it is non-selective
Direct current protecting action leads to three station full cut-ofves.
Invention content
The technical problem to be solved by the present invention is to provide a kind of direct current protecting definite value of multi-terminal direct current transmission system in short-term
Switching method and device, when single current conversion station breaks down, non-faulting current conversion station can escape the wave of electrical quantity during failure
It is dynamic, continue held stationary operation.
On the one hand the embodiment of the present invention provides a kind of direct current protecting definite value of the multi-terminal direct current transmission system side of switching in short-term
Method, including：
This current conversion station is determined by the way that the action in the selective direct current protecting of the direct current protecting device of this current conversion station is arranged
Whether it is failure current conversion station；
When it is failure current conversion station to determine this current conversion station, the dc circuit breaker for controlling this current conversion station disconnects isolated fault area
Domain, and other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value switching command in short-term so that other are changed
According to the direct current protecting definite value, switching command improves the non-choosing of the direct current protecting device of itself in preset duration in short-term at stream station
The action of selecting property direct current protecting judges the time.
Preferably, the action judgement time of the non-selective direct current protecting for improving the direct current protecting device of itself is specific
Action to act non-selective direct current protecting judges that the time improves to t1；Wherein t1 meets t2<t1<t3；T2 is failure station
The sum of selective direct current protecting actuation time, dc circuit breaker tripping time and failure electrical quantity recovery time three；T3 is
Equipment tolerance time.
Preferably, the non-selective direct current protecting is continued above default in the maximum current of a test point of current conversion station
The duration of current threshold acts when being more than the action judgement time.
Preferably, the non-selective direct current protecting includes the overcurrent protection of valve direct current, DC voltage unbalance protection, direct current
Field ground connection overcurrent protection.
Preferably, the current differential of two test point of the selective direct current protecting in current conversion station is more than that predetermined current is poor
It is acted when value threshold value.
On the other hand the embodiment of the present invention provides a kind of current conversion station of Multi-end flexible direct current transmission system and puts into dress online
It sets, including：
Breakdown judge module, for by be arranged the direct current protecting device of this current conversion station selective direct current protecting it is dynamic
Make to determine whether this current conversion station is failure current conversion station；
Protection act module, for when it is failure current conversion station to determine this current conversion station, controlling the direct current interruption of this current conversion station
Device disconnects isolated fault region, and other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value and switch in short-term
Order so that switching command improves the direct current of itself to other current conversion stations in preset duration in short-term according to the direct current protecting definite value
The action of the non-selective direct current protecting of protective device judges the time.
Preferably, the action judgement time of the non-selective direct current protecting for improving its direct current protecting device specially will
The action judgement time of non-selective direct current protecting action improves to t1；Wherein t1 meets t2<t1<t3；T2 selects for failure station
The sum of property direct current protecting actuation time, dc circuit breaker tripping time and failure electrical quantity recovery time three；T3 is equipment
Tolerance time.
Preferably, the non-selective direct current protecting is continued above default in the maximum current of a test point of current conversion station
The duration of current threshold acts when being more than the action judgement time.
Preferably, the non-selective direct current protecting includes the overcurrent protection of valve direct current, DC voltage unbalance protection, direct current
Field ground connection overcurrent protection.
Preferably, the current differential of two test point of the selective direct current protecting in current conversion station is more than that predetermined current is poor
It is acted when value threshold value.
Compared with the prior art, the advantageous effect of the embodiment of the present invention is：An embodiment of the present invention provides a kind of multiterminal
The direct current protecting definite value of DC transmission system switching method and device in short-term, first by the way that the direct current protecting in this current conversion station is arranged
The action of the selective direct current protecting of device determines whether this current conversion station is failure current conversion station, when determining that this current conversion station is failure
When current conversion station, the dc circuit breaker for controlling this current conversion station disconnects, and defeated to multiterminal element by being communicated between the station between current conversion station
Other current conversion stations in electric system send direct current protecting definite value switching command in short-term so that other current conversion stations are protected according to the direct current
Shield definite value in short-term switching command improved in preset duration the direct current protecting device of itself non-selective direct current protecting action
Judge the time, original definite value to be restored to after the short time, for the interference of electrical quantity during escaping failure, non-faulting station is avoided to protect
Stoppage in transit current conversion station is acted, to ensure that non-faulting current conversion station continues even running, i.e., when single current conversion station breaks down, non-event
Barrier current conversion station can escape the fluctuation of electrical quantity during failure, continue held stationary operation.
Description of the drawings
Fig. 1 is the direct current protecting definite value switching method in short-term of multi-terminal direct current transmission system provided in an embodiment of the present invention
Flow diagram；
Fig. 2 is the knot of the direct current protecting definite value switching device in short-term of multi-terminal direct current transmission system provided in an embodiment of the present invention
Structure block diagram.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the direct current protecting definite value that it is multi-terminal direct current transmission system provided in an embodiment of the present invention is cut in short-term
Change the flow diagram of method.
This approach includes the following steps：
S1 determines this change of current by the way that the action in the selective direct current protecting of the direct current protecting device of this current conversion station is arranged
Whether stand is failure current conversion station；
S2, when it is failure current conversion station to determine this current conversion station, the dc circuit breaker for controlling this current conversion station disconnects isolated fault
Region, and other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value switching command in short-term so that other
According to the direct current protecting definite value, switching command improves the non-of the direct current protecting device of itself to current conversion station in preset duration in short-term
The action of selective direct current protecting judges the time.
In multi-terminal direct current transmission system, when some current conversion station breaks down, by having selective direct current protecting quick
Action, to position the current conversion station to break down.The direct current protecting configured in DC converter station can be divided into two classes, have selectivity
Direct current protecting and non-selective direct current protecting, by taking the direct current protecting of transverter as an example, bridge arm differential protection and bridge arm reactor are poor
Dynamic protection is selective direct current protecting, is respectively intended to positioning and is happened at the failure in reactor region and is happened at bridge arm area
The failure in domain, basic principle are all the differences by taking the region both sides current measuring device, such as the bridge arm that upper bridge arm configures
Differential protection takes the current differential of two test points, can position the failure in bridge arm region, when failure is happened at upper bridge arm,
Two test points can have prodigious difference, and protection act, outside generation area, the electric current of two test points is equal, and protection is not
Action, failure are happened between two test points, and direct current protecting can just act, and be happened at outside two test point regions, and direct current is protected
Shield will not act, to realize the selectivity of protection.Bridge arm overcurrent protection and valve direct current overcurrent protection do not have selectivity, mainly
For protecting equipment, equipment over-voltage and over-current is prevented, the maximum value of obtaining current when basic principle, for example, valve direct current overcurrent protection takes
Must be the maximum value of some test point, when the duration that maximum value is continued above predetermined current threshold is more than the action judgement time
When, non-selective direct current protecting can act, and in any area fault, which may all act, therefore not have selection
Property.
When some current conversion station breaks down, non-faulting current conversion station may experience larger failure electrical quantity, to
So that the non-selective direct current protecting of non-faulting current conversion station acts, lead to three station full cut-ofves.The embodiment of the present invention in order to avoid
The situation determines this change of current by the way that the action in the selective direct current protecting of the direct current protecting device of this current conversion station is arranged first
Whether be failure current conversion station, when it is failure current conversion station to determine this current conversion station, the dc circuit breaker for controlling this current conversion station disconnects if standing,
And it is short by communicating the transmission of other current conversion stations into multi-terminal direct current transmission system direct current protecting definite value between the station between current conversion station
When switching command so that according to the direct current protecting definite value, switching command improves itself to other current conversion stations in preset duration in short-term
The action of non-selective direct current protecting of direct current protecting device judge the time, original definite value is restored to after the short time, for hiding
The interference for crossing electrical quantity during failure, avoids non-faulting station protection act stoppage in transit current conversion station, to ensure non-faulting current conversion station after
Continuous even running, i.e., when single current conversion station breaks down, non-faulting current conversion station can escape the fluctuation of electrical quantity during failure,
Continue held stationary operation.
In a kind of optional embodiment, the non-selective direct current protecting for improving the direct current protecting device of itself
The action judgement time is specially to improve the action judgement time that non-selective direct current protecting acts to t1；Wherein t1 meets t2<
t1<t3；When t2 is that failure station selectivity direct current protecting actuation time, dc circuit breaker tripping time and failure electrical quantity are restored
Between the sum of three；T3 is equipment tolerance time.T1, which is more than t2, can make non-faulting current conversion station hide the electrical of failure current conversion station
Interference, t1, which is less than t3, to be damaged to avoid equipment.
In a kind of optional embodiment, maximum of the non-selective direct current protecting in a test point of current conversion station
The duration that electric current is continued above predetermined current threshold acts when being more than the action judgement time.
In a kind of optional embodiment, the non-selective direct current protecting includes the overcurrent protection of valve direct current, direct current
Unbalance protection, DC fields is pressed to be grounded overcurrent protection.
In a kind of optional embodiment, the current difference of two test point of the selectivity direct current protecting in current conversion station
Value acts when being more than predetermined current difference threshold.
Referring to Fig. 2, the direct current protecting definite value that it is multi-terminal direct current transmission system provided in an embodiment of the present invention is cut in short-term
The structure diagram of changing device.
The device includes：
Breakdown judge module 1, for by the way that the selective direct current protecting in the direct current protecting device of this current conversion station is arranged
It acts to determine whether this current conversion station is failure current conversion station；
Protection act module 2, for when it is failure current conversion station to determine this current conversion station, controlling the direct current interruption of this current conversion station
Device disconnects isolated fault region, and other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value and switch in short-term
Order so that switching command improves the direct current of itself to other current conversion stations in preset duration in short-term according to the direct current protecting definite value
The action of the non-selective direct current protecting of protective device judges the time.
In a kind of optional embodiment, the action of the non-selective direct current protecting for improving its direct current protecting device
The judgement time is specially to improve the action judgement time that non-selective direct current protecting acts to t1；Wherein t1 meets t2<t1<
t3；T2 is failure station selectivity direct current protecting actuation time, dc circuit breaker tripping time and failure electrical quantity recovery time
The sum of three；T3 is equipment tolerance time.
In a kind of optional embodiment, maximum of the non-selective direct current protecting in a test point of current conversion station
The duration that electric current is continued above predetermined current threshold acts when being more than the action judgement time.
In a kind of optional embodiment, the non-selective direct current protecting includes the overcurrent protection of valve direct current, direct current
Unbalance protection, DC fields is pressed to be grounded overcurrent protection.
In a kind of optional embodiment, the current difference of two test point of the selectivity direct current protecting in current conversion station
Value acts when being more than predetermined current difference threshold.
It should be noted that the direct current protecting definite value of the multi-terminal direct current transmission system of embodiment of the present invention switching device in short-term
All method and steps for executing the direct current protecting definite value of above-mentioned multi-terminal direct current transmission system switching method in short-term, the work of the two
Make principle and advantageous effect corresponds, thus repeats no more.
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separating component
The unit of explanation may or may not be physically separated, and the component shown as unit can be or can also
It is not physical unit, you can be located at a place, or may be distributed over multiple network units.It can be according to actual
It needs that some or all of module therein is selected to achieve the purpose of the solution of this embodiment.
Compared with the prior art, the advantageous effect of the embodiment of the present invention is：An embodiment of the present invention provides a kind of multiterminal
The direct current protecting definite value of DC transmission system switching method and device in short-term, first by the way that the direct current protecting in this current conversion station is arranged
The action of the selective direct current protecting of device determines whether this current conversion station is failure current conversion station, when determining that this current conversion station is failure
When current conversion station, the dc circuit breaker for controlling this current conversion station disconnects, and defeated to multiterminal element by being communicated between the station between current conversion station
Other current conversion stations in electric system send direct current protecting definite value switching command in short-term so that other current conversion stations are protected according to the direct current
Shield definite value in short-term switching command improved in preset duration the direct current protecting device of itself non-selective direct current protecting action
Judge the time, original definite value to be restored to after the short time, for the interference of electrical quantity during escaping failure, non-faulting station is avoided to protect
Stoppage in transit current conversion station is acted, to ensure that non-faulting current conversion station continues even running, i.e., when single current conversion station breaks down, non-event
Barrier current conversion station can escape the fluctuation of electrical quantity during failure, continue held stationary operation.
It is the preferred embodiment of the present invention above, it is noted that for those skilled in the art,
Various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as this hair
Bright protection domain.
Claims (10)
1. a kind of direct current protecting definite value of multi-terminal direct current transmission system switching method in short-term, which is characterized in that including：
Whether this current conversion station is determined by the way that the action in the selective direct current protecting of the direct current protecting device of this current conversion station is arranged
For failure current conversion station；
When it is failure current conversion station to determine this current conversion station, the dc circuit breaker for controlling this current conversion station disconnects isolated fault region, and
Other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value switching command in short-term so that other current conversion station roots
According to the direct current protecting definite value, switching command improves the non-selective straight of the direct current protecting device of itself in preset duration in short-term
The action of stream protection judges the time.
2. the direct current protecting definite value of multi-terminal direct current transmission system as described in claim 1 switching method in short-term, which is characterized in that
The action judgement time of the non-selective direct current protecting for improving the direct current protecting device of itself is specially will be non-selective straight
The action judgement time of stream protection act improves to t1；Wherein t1 meets t2<t1<t3；T2 is failure station selectivity direct current protecting
The sum of actuation time, dc circuit breaker tripping time and failure electrical quantity recovery time three；T3 is equipment tolerance time.
3. the direct current protecting definite value of multi-terminal direct current transmission system as described in claim 1 switching method in short-term, described non-selection
Property direct current protecting be continued above in the maximum current of a test point of current conversion station predetermined current threshold duration be more than it is described dynamic
Judge acts when the time.
4. switching method, feature exist the direct current protecting definite value of the multi-terminal direct current transmission system as described in claim 1 or 3 in short-term
In the non-selective direct current protecting includes the overcurrent protection of valve direct current, DC voltage unbalance protection, DC fields ground connection overcurrent guarantor
Shield.
5. the direct current protecting definite value of multi-terminal direct current transmission system as described in claim 1 switching method in short-term, which is characterized in that
When the current differential of two test point of the selectivity direct current protecting in current conversion station is more than predetermined current difference threshold and meet
It is acted when certain delay.
6. a kind of direct current protecting definite value of multi-terminal direct current transmission system switching device in short-term, which is characterized in that including：
Breakdown judge module, for by the action in the selective direct current protecting of the direct current protecting device of this current conversion station is set come
Determine whether this current conversion station is failure current conversion station；
Protection act module, the dc circuit breaker for when it is failure current conversion station to determine this current conversion station, controlling this current conversion station are disconnected
Isolated fault region is opened, and other current conversion stations into multi-terminal direct current transmission system send direct current protecting definite value and switch life in short-term
It enables so that according to the direct current protecting definite value, switching command improves the direct current guarantor of itself to other current conversion stations in preset duration in short-term
The action of the non-selective direct current protecting of protection unit judges the time.
7. the direct current protecting definite value of multi-terminal direct current transmission system as claimed in claim 6 switching device in short-term, which is characterized in that
The action judgement time of the non-selective direct current protecting for improving its direct current protecting device is specially to protect non-selective direct current
The action judgement time of shield action improves to t1；Wherein t1 meets t2<t1<t3；T2 acts for failure station selectivity direct current protecting
The sum of time, dc circuit breaker tripping time and failure electrical quantity recovery time three；T3 is equipment tolerance time.
8. the direct current protecting definite value of multi-terminal direct current transmission system as claimed in claim 6 switching device in short-term, described non-selection
Property direct current protecting be continued above in the maximum current of a test point of current conversion station predetermined current threshold duration be more than it is described dynamic
Judge acts when the time.
9. switching device, feature exist the direct current protecting definite value of the multi-terminal direct current transmission system as described in claim 6 or 8 in short-term
In the non-selective direct current protecting includes the overcurrent protection of valve direct current, DC voltage unbalance protection, DC fields ground connection overcurrent guarantor
Shield.
10. switching device, feature exist the direct current protecting definite value of multi-terminal direct current transmission system as claimed in claim 6 in short-term
In the current differential of two test point of the selectivity direct current protecting in current conversion station occurs when being more than predetermined current difference threshold
Action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249219.3A CN108376976A (en) | 2018-03-23 | 2018-03-23 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249219.3A CN108376976A (en) | 2018-03-23 | 2018-03-23 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
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| Publication Number | Publication Date |
|---|---|
| CN108376976A true CN108376976A (en) | 2018-08-07 |
Family
ID=63019180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810249219.3A Pending CN108376976A (en) | 2018-03-23 | 2018-03-23 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
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| CN (1) | CN108376976A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109038518A (en) * | 2018-08-20 | 2018-12-18 | 南方电网科学研究院有限责任公司 | A kind of fixed value adjusting and movement fitting method of multiterminal element route protection |
| CN110912174A (en) * | 2019-12-02 | 2020-03-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method and device for stopping multi-terminal direct-current power transmission system under communication fault |
| CN111416378A (en) * | 2020-04-21 | 2020-07-14 | 南方电网科学研究院有限责任公司 | Switching control method, device, terminal and medium for converting metal return wire into earth return wire |
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| CN106684841A (en) * | 2017-02-03 | 2017-05-17 | 许继电气股份有限公司 | Flexible direct-current grid system direct-current short-circuit fault protection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106684841A (en) * | 2017-02-03 | 2017-05-17 | 许继电气股份有限公司 | Flexible direct-current grid system direct-current short-circuit fault protection method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038518A (en) * | 2018-08-20 | 2018-12-18 | 南方电网科学研究院有限责任公司 | A kind of fixed value adjusting and movement fitting method of multiterminal element route protection |
| CN110912174A (en) * | 2019-12-02 | 2020-03-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method and device for stopping multi-terminal direct-current power transmission system under communication fault |
| CN111416378A (en) * | 2020-04-21 | 2020-07-14 | 南方电网科学研究院有限责任公司 | Switching control method, device, terminal and medium for converting metal return wire into earth return wire |
| CN111416378B (en) * | 2020-04-21 | 2022-02-15 | 南方电网科学研究院有限责任公司 | Switching control method, device, terminal and medium for converting metal return wire into earth return wire |
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