CN113224734B - Implementation method and terminal for auxiliary protection of line - Google Patents
Implementation method and terminal for auxiliary protection of line Download PDFInfo
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- CN113224734B CN113224734B CN202110491823.9A CN202110491823A CN113224734B CN 113224734 B CN113224734 B CN 113224734B CN 202110491823 A CN202110491823 A CN 202110491823A CN 113224734 B CN113224734 B CN 113224734B
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- protection
- target interval
- interval
- line
- overcurrent protection
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004590 computer program Methods 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims 1
- 230000006870 function Effects 0.000 description 14
- 230000002159 abnormal effect Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a method for realizing line auxiliary protection and a terminal, wherein corresponding overcurrent protection is added for each interval in the bus differential protection, and then the corresponding overcurrent protection of the target interval is started when the target interval of the line auxiliary protection is needed to be put into the bus differential protection in judgment, so as to play a role in line protection for the target interval; the primary equipment connected with the target interval can continue to operate under the protection condition without power failure caused by losing the protection of the line protection device, and the expanded line fault accident caused by the unprotected operation of the equipment is prevented.
Description
Technical Field
The invention relates to the field of relay protection profession, in particular to a method and a terminal for realizing auxiliary protection of a circuit.
Background
The line protection device is mainly used for protection measurement and control of line interval units of various voltage levels, has perfect protection, measurement, control and communication monitoring functions, provides a complete solution for protection and control of transformer substations, power plants, high-low voltage distribution and station power systems, and can effectively ensure safe and stable operation of a power grid.
One of the drawbacks of current line protection devices in practical use is: when the line protection device is locked, abnormal or out of operation, the primary equipment also needs to be powered off, otherwise, the protection function is lost. Because if the line protection device does not protect the primary equipment and the transmission line is still running, the line fault is easily tripped to the main transformer in an override mode, which not only does not meet the rule requirement, but also can enlarge the power failure range. Moreover, if in this case, a primary equipment power outage causes unnecessary power outage to the power plant or the user or affects the power supply reliability, causing unnecessary loss of load or the power plant may lose the power generation amount, etc.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the implementation method and the terminal for the auxiliary protection of the line are provided, so that power failure is not required when the primary equipment exits from the line protection device, and the reliability of power supply is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for realizing auxiliary protection of a line comprises the following steps:
s1, adding corresponding overcurrent protection for each interval in the bus differential protection;
s2, judging whether a target interval needing to be put into line auxiliary protection exists in the bus differential protection, if so, executing a step S3, otherwise, returning to continue executing the step S2;
and S3, enabling the overcurrent protection corresponding to the target interval, and playing a role in protecting the line for the target interval.
In order to solve the technical problems, the invention adopts another technical scheme that:
the implementation terminal of the circuit auxiliary protection comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes each step in the implementation method of the circuit auxiliary protection when executing the computer program.
In summary, the beneficial effects of the invention are as follows: the method and the terminal for realizing the auxiliary protection of the line are provided, the overcurrent protection is added to each interval of the bus differential protection, when the protection of the line protection device is lost at the target interval, the overcurrent protection is used for protecting the line at the target interval, so that primary equipment connected with the target interval can continue to operate under the protection condition without power failure caused by losing the protection of the line protection device, and the expanded line fault accident caused by the unprotected operation of the equipment is prevented.
Drawings
Fig. 1 is a schematic diagram of steps of a method for implementing line auxiliary protection according to an embodiment of the present invention;
fig. 2 is a logic diagram of a protection function of a method for implementing line auxiliary protection according to an embodiment of the present invention;
fig. 3 is a system block diagram of a terminal for implementing line auxiliary protection according to an embodiment of the present invention.
Description of the reference numerals:
1. a terminal for realizing auxiliary protection of a line; 2. a processor; 3. a memory.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 2, a method for implementing auxiliary protection of a line includes the following steps:
s1, adding corresponding overcurrent protection for each interval in the bus differential protection;
s2, judging whether a target interval needing to be put into line auxiliary protection exists in the bus differential protection, if so, executing a step S3, otherwise, returning to continue executing the step S2;
and S3, enabling the overcurrent protection corresponding to the target interval, and playing a role in protecting the line for the target interval.
From the above description, the beneficial effects of the invention are as follows: the method and the terminal for realizing the auxiliary protection of the line are provided, the overcurrent protection is added to each interval of the bus differential protection, when the protection of the line protection device is lost at the target interval, the overcurrent protection is used for protecting the line at the target interval, so that primary equipment connected with the target interval can continue to operate under the protection condition without power failure caused by losing the protection of the line protection device, and the expanded line fault accident caused by the unprotected operation of the equipment is prevented.
Further, each compartment has a control word and a pressure plate corresponding to its overcurrent protection;
the enabling the overcurrent protection corresponding to the target interval comprises the following steps: and simultaneously inputting a control word and a pressing plate corresponding to the overcurrent protection corresponding to the target interval so as to enable the overcurrent protection corresponding to the target interval.
From the above description, it can be seen that, in the above specific implementation process of the over-current protection, the over-current protection is put into or withdrawn through the corresponding control word and the pressing plate, which does not affect the self-function of the bus differential protection, and the mode of putting into or withdrawing is simple and convenient, and the integrity of the over-current protection function can be ensured.
Further, the line protection function for the target interval is specifically as follows:
collecting the current and the bus voltage of the target interval;
judging whether the overcurrent protection corresponding to the target interval acts according to the current and the bus voltage, if so, executing the overcurrent protection to trip and disconnect the target interval, otherwise, returning to execute the step of collecting the current and the bus voltage of the target interval.
From the above description, it can be seen that, the collected current and bus voltage of the target interval are used as the basis for judging whether the overcurrent protection is performed, after the collected data of the target interval is found to meet the action execution condition of a certain overcurrent protection, that is, the target interval has a line fault, the action is immediately performed, the connection relationship between the target interval and the bus is timely disconnected, the line fault of the target interval is prevented from exceeding the level and tripping to the main transformer, and the power failure accident range is enlarged, so as to realize the line protection function.
Further, before the protecting the target interval, the method further comprises the steps of:
judging whether an interval starting element of the overcurrent protection corresponding to the target interval is started or not, and if yes, playing a role in protecting a circuit for the target interval; otherwise, returning to execute the step of judging whether the over-current protection interval starting element corresponding to the interval is started or not.
As is apparent from the above description, after the interval overcurrent auxiliary protection is embedded in the bus bar protection, a protection process in the overcurrent protection, that is, a fault handling process, is performed on the target interval if and only if the start condition of the interval start element of the overcurrent protection is reached and started. The interval starting element can timely reflect the fault or abnormal condition of the target interval, so that the protection function can be timely implemented when the fault occurs.
Further, the step S3 further includes the following steps:
setting the setting value of the interval starting element to be a preset multiple of the minimum overcurrent setting value of the overcurrent protection.
As is clear from the above description, setting the setting value of the interval starting element for the over-current protection can increase the starting sensitivity of the interval starting element, thereby accelerating the reaction speed of the over-current protection to the failure of the target interval and performing more reliable ground protection on the target interval.
Further, the over-current protection comprises at least one of double-voltage direction over-current protection and zero sequence direction over-current protection.
As can be seen from the above description, at least one of the overvoltage protection in the double-voltage direction and the overcurrent protection in the zero-sequence direction corresponding to each interval is added to the differential protection. The overvoltage protection in the overvoltage direction is overcurrent protection adopting composite voltage blocking, can perform protection action when a short circuit fault occurs in a spacing line, and can prevent protection misoperation caused by the condition that some non-faults but current rises instantaneously and the voltage is not large, so that the reliability of protection operation is improved. The zero sequence direction overcurrent protection is the overcurrent protection formed by utilizing zero sequence current generated when the ground fault occurs on the transmission line, and can reflect the interval ground fault and implement protection; the reliability is further improved by adopting various overcurrent protection modes.
Further, the double-voltage direction overcurrent protection and the zero sequence direction overcurrent protection are two-section or three-section overcurrent protection.
From the above description, both the overvoltage protection in the double-voltage direction and the overcurrent protection in the zero sequence direction can be provided with multi-stage protection. The protection of different sections is set with different setting values and has different time delays, so that the reliability, selectivity, rapidity and sensitivity of the overcurrent protection can be increased.
Further, the step S1 specifically includes:
and embedding an overcurrent protection program corresponding to each interval in the bus differential protection, wherein the overcurrent protection program and the bus differential protection share hardware equipment.
From the above description, it is known that the program for implementing the overcurrent protection function is added to the bus differential protection by embedding, without adding an additional current transformer loop, a voltage transformer loop, a trip outlet loop and a protection device, and without increasing the equipment cost.
Further, before the step S3, the method further includes:
and judging whether the differential starting element of the female differential protection is started, if so, executing the female differential protection, otherwise, executing the step S3.
As is apparent from the above description, the differential protection has priority over the overcurrent protection, that is, when the differential start-up element of the differential protection is started, the differential protection is preferentially performed regardless of whether the start-up element of the overcurrent protection is started or not. Compared with the interval, the bus-bar main transformer has a more important position in the whole power supply network, and when the bus-bar main transformer is abnormal, the bus-bar main transformer is protected preferentially, so that the loss caused by power supply faults can be reduced to the minimum in time and the range of fault influence can be reduced to be small.
Referring to fig. 3, a circuit-assisted protection implementation terminal 1 includes a memory 3, a processor 2, and a computer program stored in the memory 3 and capable of running on the processor 2, where the processor 2 implements each step in the above-mentioned circuit-assisted protection implementation method when executing the computer program.
From the above description, the beneficial effects of the invention are as follows: the method and the terminal for realizing the auxiliary protection of the line are provided, the overcurrent protection is added to each interval of the bus differential protection, when the protection of the line protection device is lost at the target interval, the overcurrent protection is used for protecting the line at the target interval, so that primary equipment connected with the target interval can continue to operate under the protection condition without power failure caused by losing the protection of the line protection device, and the expanded line fault accident caused by the unprotected operation of the equipment is prevented.
Referring to fig. 1 and 2, a first embodiment of the invention is as follows:
a method for realizing line auxiliary protection, as shown in figure 1, comprises the following steps:
s1, adding corresponding overcurrent protection for each interval in the bus differential protection;
in this embodiment, step S1 is specifically performed by embedding the overcurrent protection program corresponding to each interval in the bus differential protection. And, the overcurrent protection program and the bus differential protection share the hardware equipment. In other words, the embodiment does not need to add any extra hardware cost such as a current transformer loop, a voltage transformer loop, a tripping outlet and the like; wherein, the differential protection may be 110kV differential protection.
Also, as shown in fig. 2, in the present embodiment, the overcurrent protection is divided into two types: one is the overvoltage protection in the back pressure direction; the other is zero sequence direction overcurrent protection. Specifically, the double-voltage direction overcurrent protection and the zero sequence direction overcurrent protection are two-section or three-section overcurrent protection. In other equivalent embodiments, the over-current protection may be other over-current protection with a line protection function, and the number of protection segments may be changed according to actual situations.
S2, judging whether a target interval needing to be put into line auxiliary protection exists in the bus differential protection, if so, executing a step S3, otherwise, returning to continue executing the step S2;
in the running process of the power grid, after the line protection of the interval connecting the primary equipment is withdrawn, the corresponding primary equipment is required to be powered off. If the primary equipment fails in this case, the power loss of the power plant is caused, which brings inconvenience to the user and affects the reliability of power supply. In this case, if the primary equipment continues to operate, the primary equipment is liable to trip out of order when a line fault occurs, and the power outage range is widened, resulting in a larger loss.
S3, enabling overcurrent protection corresponding to the target interval, and playing a role in protecting the target interval.
In this embodiment, after the occurrence of the above situation is determined, the overcurrent protection corresponding to the target interval is enabled, so that the primary equipment connected to the target interval can continue to operate under the condition of protection without power failure caused by loss of protection of the line protection device, and an enlarged line fault accident caused by unprotected operation of the equipment is prevented. Specifically, each compartment has a control word and a pressure plate corresponding to its over-current protection. In addition, as shown in fig. 2, in this embodiment, by simultaneously inputting the control word corresponding to the overcurrent protection corresponding to the target interval and the pressing plate including the soft pressing plate and the hard pressing plate, the overcurrent protection corresponding to the target interval is started, and the input and the exit modes are simple, so that the integrity of the overcurrent protection function is ensured.
In addition, in the present embodiment, before executing step S3, it is further determined whether the differential start-up element of the differential protection is started, if so, the differential protection is executed, otherwise, step S3 is executed. Although the bus differential protection is added with corresponding overcurrent protection for each interval, when the target interval and the bus differential main transformer have abnormal conditions at the same time, the bus differential protection needs to be preferentially executed so as to minimize the loss caused by power supply faults and reduce the range of fault influence.
Referring to fig. 2, a second embodiment of the present invention is as follows:
the implementation method of the auxiliary line protection needs to perform the following steps before the line protection function is performed on the target interval on the basis of the first embodiment:
after the overcurrent protection corresponding to the target interval is started, setting the setting value of the interval starting element to be a preset multiple of the minimum overcurrent setting value of the overcurrent protection. Specifically, the preset multiple is preferably 0.9 times. In other equivalent embodiments, other preset multiples can be set according to practical situations. The setting value of the interval starting element influences the starting sensitivity of the interval starting element, and the interval starting element can be prevented from being started by mistake due to the fact that some non-line faults exist.
Further, judging whether an interval starting element of the overcurrent protection corresponding to the target interval is started or not, and if yes, playing a role in protecting the target interval; otherwise, after a certain time delay, the whole group is reset, and the step of executing the judgment of whether the interval starting element of the overcurrent protection corresponding to the interval is started or not is returned.
In this embodiment, after the overcurrent protection is put into the bus bar protection, the protection process in the overcurrent protection, that is, the failure handling process, is performed on the target interval if and only if the start condition of the interval start element of the overcurrent protection is reached and started. The interval starting element can timely reflect the fault or abnormal condition of the target interval, so that the protection function can be timely implemented when the fault occurs.
As shown in fig. 2, the specific process of playing a role in protecting the line for the target interval is as follows:
first, the current and bus voltage of the target interval are collected. Specifically, the target interval may be determined by the position of the busbar side blade that is connected to the busbar differential protection.
Then, judging whether the overcurrent protection corresponding to the target interval acts or not according to the current and the bus voltage;
and finally, if the overcurrent protection needs to act, the overcurrent protection executes the action to trip and disconnect the target interval, otherwise, the step of collecting the current and the bus voltage of the target interval is returned to be executed.
Referring to fig. 3, a third embodiment of the present invention is as follows:
as shown in fig. 3, a line auxiliary protection implementation terminal 1 includes a memory 3, a processor 2, and a computer program stored in the memory 3 and capable of running on the processor 2, where the processor 2 implements a line auxiliary protection implementation method according to the first or second embodiment when executing the computer program.
In summary, the invention discloses a method and a terminal for implementing auxiliary protection of a circuit, wherein the method and the terminal correspondingly increase the overcurrent protection at each interval of the busbar protection by throwing a control word and a pressing plate, and the overcurrent protection comprises at least one of the overvoltage protection in the double-voltage direction and the overcurrent protection in the zero sequence direction; when the protection of the line protection device is lost at the target interval, the overcurrent protection is used for protecting the line at the target interval, the value of the current and the like at the target interval is collected to serve as a judging basis for judging whether the tripping protection is needed to be continued, and the sensitivity of an interval starting element of the overcurrent protection is adjusted to increase the reliability of the overcurrent protection, so that primary equipment connected with the target interval can continue to operate under the condition of protection without power failure caused by losing the protection of the line protection device, and the amplified line fault accident caused by the unprotected operation of the equipment is prevented; compared with the existing protection method which only depends on the line protection device, by adding the overcurrent auxiliary protection function in the bus differential protection, the overcurrent protection of the corresponding interval during the withdrawal of the line protection device is added by means of the overcurrent auxiliary protection function, an overcurrent protection program and bus differential protection shared hardware equipment is further arranged, no additional hardware facilities are needed, safety guarantee is provided for each interval of the bus differential protection, load loss of a user and power generation capacity loss of a power plant are reduced, and the reliability of power supply is improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant technical field, are included in the scope of the present invention.
Claims (10)
1. The implementation method of the circuit auxiliary protection is characterized by comprising the following steps:
s1, adding corresponding overcurrent protection for each interval in the bus differential protection;
s2, judging whether a target interval for line overcurrent protection to be put into exists in the bus differential protection, wherein a line protection device at the target interval exits from operation, if yes, executing a step S3, otherwise, returning to continue executing the step S2;
and S3, enabling the overcurrent protection corresponding to the target interval, and playing a role in protecting the line for the target interval.
2. The method of claim 1, wherein each of the spacers has a control word and a platen corresponding to its over-current protection;
the enabling the overcurrent protection corresponding to the target interval comprises the following steps: and simultaneously inputting a control word and a pressing plate corresponding to the overcurrent protection corresponding to the target interval so as to enable the overcurrent protection corresponding to the target interval.
3. The method for implementing line auxiliary protection according to claim 1, wherein the acting as line protection for the target interval is specifically:
collecting the current and the bus voltage of the target interval;
judging whether the overcurrent protection corresponding to the target interval acts according to the current and the bus voltage, if so, executing the overcurrent protection to trip and disconnect the target interval, otherwise, returning to execute the step of collecting the current and the bus voltage of the target interval.
4. A method of implementing line assist protection as recited in claim 3 wherein said acting as line protection for said target interval further comprises the step of:
judging whether an interval starting element of the overcurrent protection corresponding to the target interval is started or not, and if yes, playing a role in protecting a circuit for the target interval; otherwise, returning to execute the step of judging whether the over-current protection interval starting element corresponding to the interval is started or not.
5. The method for implementing line auxiliary protection according to claim 4, wherein the step S3 further comprises the steps of:
setting the setting value of the interval starting element to be a preset multiple of the minimum overcurrent setting value of the overcurrent protection.
6. The method according to any one of claims 1 to 5, wherein the over-current protection includes at least one of a back-voltage direction over-current protection and a zero-sequence direction over-current protection.
7. The method according to claim 6, wherein the step-up direction overcurrent protection and the zero sequence direction overcurrent protection are two-stage or three-stage overcurrent protection.
8. The method for implementing line auxiliary protection according to claim 1, wherein the step S1 is specifically:
and embedding an overcurrent protection program corresponding to each interval in the bus differential protection, wherein the overcurrent protection program and the bus differential protection share hardware equipment.
9. The method for implementing line auxiliary protection according to claim 1, wherein the step S3 further comprises:
and judging whether the differential starting element of the female differential protection is started, if so, executing the female differential protection, otherwise, executing the step S3.
10. A line auxiliary protection implementing terminal, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of a line auxiliary protection implementing method according to any one of claims 1 to 9 when the computer program is executed by the processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110491823.9A CN113224734B (en) | 2021-05-06 | 2021-05-06 | Implementation method and terminal for auxiliary protection of line |
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| CN202110491823.9A CN113224734B (en) | 2021-05-06 | 2021-05-06 | Implementation method and terminal for auxiliary protection of line |
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| CN113224734B true CN113224734B (en) | 2024-02-20 |
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| CN114498540B (en) * | 2022-02-07 | 2024-03-19 | 华能铜川照金煤电有限公司 | Auxiliary protection online setting and control method for power distribution system for factory |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203151085U (en) * | 2013-01-25 | 2013-08-21 | 上海山源电子电气科技发展有限公司 | Coal mine power distribution network intelligent protection system |
| CN103683218A (en) * | 2013-12-18 | 2014-03-26 | 南京国电南自电网自动化有限公司 | Distributed bus protection device based on HSR |
| CN104362599A (en) * | 2014-11-13 | 2015-02-18 | 国家电网公司 | Method for protecting low-voltage bus of intelligent substation |
| CN110311359A (en) * | 2019-06-05 | 2019-10-08 | 许继集团有限公司 | A kind of DC distribution net networking protection system |
| CN110556794A (en) * | 2019-09-12 | 2019-12-10 | 中国南方电网有限责任公司超高压输电公司柳州局 | Bus bar protection configuration method of multi-end hybrid direct current system |
| CN111900696A (en) * | 2020-07-15 | 2020-11-06 | 中国人民解放军海军工程大学 | Shore power relay protection system and method for AC-DC coexistence power supply |
-
2021
- 2021-05-06 CN CN202110491823.9A patent/CN113224734B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203151085U (en) * | 2013-01-25 | 2013-08-21 | 上海山源电子电气科技发展有限公司 | Coal mine power distribution network intelligent protection system |
| CN103683218A (en) * | 2013-12-18 | 2014-03-26 | 南京国电南自电网自动化有限公司 | Distributed bus protection device based on HSR |
| CN104362599A (en) * | 2014-11-13 | 2015-02-18 | 国家电网公司 | Method for protecting low-voltage bus of intelligent substation |
| CN110311359A (en) * | 2019-06-05 | 2019-10-08 | 许继集团有限公司 | A kind of DC distribution net networking protection system |
| CN110556794A (en) * | 2019-09-12 | 2019-12-10 | 中国南方电网有限责任公司超高压输电公司柳州局 | Bus bar protection configuration method of multi-end hybrid direct current system |
| CN111900696A (en) * | 2020-07-15 | 2020-11-06 | 中国人民解放军海军工程大学 | Shore power relay protection system and method for AC-DC coexistence power supply |
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