CN111682509A - Power transmission line protection system and protection configuration method - Google Patents
Power transmission line protection system and protection configuration method Download PDFInfo
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- CN111682509A CN111682509A CN202010304322.0A CN202010304322A CN111682509A CN 111682509 A CN111682509 A CN 111682509A CN 202010304322 A CN202010304322 A CN 202010304322A CN 111682509 A CN111682509 A CN 111682509A
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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
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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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
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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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
- H02H7/261—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 involving signal transmission between at least two stations
Abstract
The invention relates to a power transmission line protection system and a protection configuration method, wherein a main protection and a backup protection are configured in a power transmission line, wherein the backup protection is only configured with a distance II section protection, when the main protection fails, the distance II section protection is put into operation, when the main protection fails, the distance II section protection is directly put into operation no matter what kind of fault occurs to the power transmission line, and especially when the fault is a far-end fault of a line, the distance I section is not involved in the backup protection any more, so that the following can be avoided: move earlier apart from I section, set for the time delay and arrive the back, just move apart from II sections, can reduce the trouble excision time to a great extent, realize the quick excision of trouble.
Description
Technical Field
The invention relates to a power transmission line protection system and a protection configuration method.
Background
The main protection of the high-voltage transmission line configuration is generally pilot protection, and the distance protection is used as backup protection. In general, the pilot protection is pilot fiber differential protection, and the distance protection is three-stage distance protection or two-stage distance protection. The distance I section in the distance protection is subjected to fixed value setting according to the range of 80% of the line, the distance II section requires sensitivity to the protection of the tail end of the line, and the distance I section is matched with the distance protection of the next-level line through time delay of 0.5s-1 s. In actual operation, when a main protection fault of a line is caused due to some reasons, such as a problem occurs in a pilot optical fiber channel, a protection function cannot be realized, namely, double-set differential protection in pilot protection exits, when a line has a fault, backup protection is put into use, the fault is removed by a near fault side distance I section protection and a far fault side distance II section protection action respectively, the near fault side distance I section protection action is removed, and then a corresponding time limit is delayed, and the fault is removed by the far fault side distance II section protection action.
However, when the main protection cannot play a role in protection, and when a far-end fault of a line is removed, the distance ii section protection in the backup protection has a certain setting time (i.e., a certain time delay action), which is usually over 500ms, and under the effect of the setting time, the fault removal time of the backup protection is too long, so that rapid removal of the fault cannot be achieved.
Disclosure of Invention
The invention aims to provide a power transmission line protection system and a protection configuration method, which are used for solving the problem that the fault cannot be quickly removed.
In order to achieve the above object, a scheme of the present invention includes a power transmission line protection system including:
the main protection device is used for configuring main protection, and the main protection comprises two redundantly configured in-place level protections;
the station domain protection device is used for configuring station domain protection, and the station domain protection comprises distance II section protection;
and when the main protection fails, the station area protection is put into distance II section protection.
Has the advantages that: the station territory protection is only apart from II section protections, and when main protection became invalid, apart from II section protections and drop into, so, when main protection became invalid, no matter what kind of trouble takes place for transmission line, directly drop into the action apart from II section protections, especially when the trouble is circuit distal end trouble, no longer relate to apart from I section in the backup protection, just no longer adopt: the distance protection strategy that the distance I section acts first and the distance II section acts after the set delay arrives can reduce the fault removal time to a great extent and realize the quick removal of the fault.
Further, in order to reliably obtain the protection function state of the main protection, the main protection device is connected with the backup protection device through a communication network, and the backup protection device can obtain the protection function state of the main protection through the communication network.
Furthermore, in order to more conveniently realize the protection function state of the main protection of the station domain protection acquisition, the communication network is a station control layer network.
Further, when the protection function states of the local level protection of the dual redundant configurations are all lost, the main protection is judged to be invalid.
Further, in order to improve the protection reliability of the main protection, the in-situ level protection is longitudinal optical fiber differential protection.
Further, the setting time of the distance II section protection is 150 ms.
The invention also provides a power transmission line protection configuration method, wherein the power transmission line is configured with main protection and station area protection, and the main protection comprises double redundant local-level protection; the station area protection comprises distance II section protection; and when the main protection fails, the distance II section protection in the backup protection is put into.
Has the advantages that: the station territory protection is only apart from II section protections, and when main protection became invalid, apart from II section protections and drop into, so, when main protection became invalid, no matter what kind of trouble takes place for transmission line, directly drop into the action apart from II section protections, especially when the trouble is circuit distal end trouble, no longer relate to apart from I section in the backup protection, just no longer adopt: the distance protection strategy that the distance I section acts first and the distance II section acts after the set delay arrives can reduce the fault removal time to a great extent and realize the quick removal of the fault.
And further, monitoring the protection function state of the main protection through a station control layer network.
Further, when the protection function states of the local level protection of the dual redundancy configuration are all lost, the main protection is judged to be invalid.
Further, the setting time of the distance II section protection is 150 ms.
Drawings
FIG. 1 is a schematic diagram of a power system topology provided by the present invention;
the system comprises a transformer substation, a substation area protection device, a first transformer substation, a second transformer substation, a first bus, a substation area protection device, a second transformer substation and a second bus, wherein 1 is the first transformer substation, 2 is the first bus, 3 is the substation area protection device, 4 is the second transformer substation, and 5 is the second bus.
Detailed Description
The embodiment of the transmission line protection system comprises:
as shown in fig. 1, the present embodiment provides an electric power system including: the system comprises a first transformer substation 1, a first bus 2, a station area protection device 3, a first transmission line L1, a second transmission line L2, a second transformer substation 4 and a second bus 5. The first substation 1 and the second substation 4 are connected through a first transmission line L1 and a second transmission line L2, and the station domain protection device 3 is installed in the first substation 1.
The power transmission line protection system of the power system comprises a main protection device and a station area protection device. The main protection device is configured with a main protection, the main protection comprises two redundantly configured in-situ level protections, and here, the in-situ level protections are tandem optical fiber differential protections, and of course, other tandem protections or other types of protections are also possible. As shown in fig. 1, the tandem optical fiber differential protection is a double protection, and for the first power transmission line L1, the tandem optical fiber differential protection includes an L1 line protection a and an L1 line protection B, which are respectively disposed on two sides of the first power transmission line L1.
And the station area protection device is only configured with distance II section protection. In this embodiment, the station domain protection is configured in the station domain protection device 3, that is, the station domain protection device 3 includes a judgment logic related to distance ii segment protection, and a distance ii segment protection element for implementing distance ii segment protection is provided inside the station domain protection device, so that the station domain protection device 3 is a backup protection device. The station area protection means 3 are therefore only concerned with distance ii protection. The distance II section protection in the station domain protection device 3 can be directly put into use without setting a delay value, or can be set with an independently set delay value, the delay value can be set according to actual needs, of course, the value of the delay value is small, namely the delay is short, the delay setting is shortened to 150ms on the basis of the distance II section protection time constant value, and the exit is operated within 200ms when a fault occurs. The station domain protection serves as a backup protection for the protection system, and therefore is a non-delayed or short-delayed distance protection.
The station domain protection device 3 is connected with a station domain network (also called a substation automation network), the station control layer network is a communication network, specifically a double star network, and comprises a station control layer A network (MMSA) and a station control layer B network (MMSB), the L1 line protection A, L1 line protection B and the station domain protection device 3 are both connected to the double star network, so that the station domain protection device 3 can communicate with the L1 line protection A and the L1 line protection B, and further the acquisition of the protection function states of the L1 line protection A and the L1 line protection B can be conveniently realized. Meanwhile, the station area protection device 3 also collects current information and voltage information of the first power transmission line L1 for fault diagnosis. As described above, the station area protection device 3 only implements backup protection for the first power transmission line L1, and then only one distance ii section protection is involved in the station area protection device 3. Of course, the station area protection device 3 may also implement backup protection of all the power transmission lines, and accordingly, the station area protection device 3 may be configured with distance ii sections of protection having the same number as the power transmission lines, and each distance ii section of protection corresponds to one power transmission line to implement backup protection of the corresponding power transmission line. Then, the station domain protection device 3 collects the protection function states of the double protection of each power transmission line through a station domain layer network, the communication protocol adopts a GOOSE message in 61850, and the station domain protection device 3 collects the protection function states of the double protection through a station control layer GOOSE. The protection function state meets the Q/GDW11010 relay protection information specification, and the protection function state of the double protection output is consistent with the actual state of the protection function. In addition, the station area protection device 3 also collects current information and voltage information of each transmission line, for example, current information and voltage information of all transmission lines on a bus can be collected through a bus.
Therefore, the station domain protection device 3 collects the protection function state of the double protection of each transmission line through the station domain layer network. Whether the main protection fails or not is judged by detecting the protection effective state or the locking state of the double-set protection, such as: when the protection function states of the double protection of a certain transmission line are all lost, namely the main protection is failed, the differential effective protection state of the double protection is 0, and the locking main protection state is 1. Then, if the station area protection device 3 detects that the main protection of a certain power transmission line is failed, the corresponding distance ii section protection in the station area protection device 3 is put into operation. Then, the station area protection device 3 collects current information and voltage information of the power transmission line, and when the power transmission line breaks down, the distance II section protection is directly put into operation. Because there is not I section of distance protection, just also avoid appearing: the distance I section acts first, and the distance II section acts after the set delay arrives. Especially when a far-end fault of a line occurs, the protection is directly operated at a distance of II sections, the far-end fault is removed, the fault removing time can be shortened to a great extent, and the fault can be rapidly removed.
In the above embodiment, the station domain protection device 3 communicates with the pilot optical fiber differential protection through the station domain layer network to obtain the protection function state of the pilot optical fiber differential protection. The reliability of data acquisition can be improved by using the station domain network, and as another embodiment, the station domain protection device 3 does not use a communication network such as the station domain network to acquire data information, but uses a conventional communication line to perform communication connection with the pilot optical fiber differential protection. The distance ii protection need not be provided in the station area protection device 3, but in other devices, such as the control system of the substation itself, i.e. the backup protection device is part of the control system.
While specific embodiments have been given above, the present invention is not limited to the specific topology of the power system shown in fig. 1, and the basic idea of the present invention is to provide a transmission line protection system, which includes: the main protection device is provided with main protection, the backup protection device is only provided with distance II section protection, and when the main protection fails, the distance II section protection is put into use. The above embodiments are merely illustrative of the protection system by way of the power system shown in fig. 1. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
The embodiment of the power transmission line protection configuration method comprises the following steps:
the embodiment provides a power transmission line protection configuration method, wherein a main protection and a backup protection are configured in a power transmission line, wherein the backup protection is only configured with a distance II section protection, and when the main protection fails, the distance II section protection is put into use. Since the above embodiment of the power transmission line protection system has described the implementation process of the power transmission line protection configuration method in detail, this embodiment is not specifically described again.
Claims (10)
1. A transmission line protection system, comprising:
the main protection device is used for configuring main protection, and the main protection comprises two redundantly configured in-place level protections;
the station domain protection device is used for configuring station domain protection, and the station domain protection comprises distance II section protection;
and when the main protection fails, the station area protection is put into distance II section protection.
2. The protection system of claim 1, wherein the main protection device is connected to the station area protection device via a communication network, and the station area protection device is capable of obtaining the protection function status of the main protection via the communication network.
3. The electrical transmission line protection system of claim 2, wherein the communication network is a station level network.
4. The protection system for power transmission lines according to claim 1, characterized in that when the status of the primary protection function of the two redundantly configured on-site level protections is lost, the primary protection is determined to be invalid.
5. The transmission line protection system of claim 1, wherein the on-ground primary protection is a tandem fiber differential protection.
6. The transmission line protection system according to claim 1, wherein the setting time of the distance II section protection can be independently set and can be set to 150 ms.
7. A power transmission line protection configuration method is characterized in that a main protection and a station domain protection are configured in a power transmission line, wherein the main protection comprises two on-site level protections which are redundantly arranged; the station area protection comprises distance II section protection;
and when the main protection fails, the distance II section protection in the backup protection is put into.
8. The method according to claim 7, wherein the state of the protection function of the primary protection is monitored by a station level network.
9. The method according to claim 8, wherein when the protection function status of the in-situ level protection of the dual redundant configurations is lost, the primary protection is determined to be invalid.
10. The transmission line protection configuration method according to claim 7, wherein the setting time of the distance II section protection can be independently set and can be set to 150 ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010304322.0A CN111682509A (en) | 2020-04-17 | 2020-04-17 | Power transmission line protection system and protection configuration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010304322.0A CN111682509A (en) | 2020-04-17 | 2020-04-17 | Power transmission line protection system and protection configuration method |
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| CN111682509A true CN111682509A (en) | 2020-09-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621217A (en) * | 2009-08-18 | 2010-01-06 | 北京四方继保自动化股份有限公司 | Protection system for area electric network data sharing |
| CN102496916A (en) * | 2011-11-30 | 2012-06-13 | 中国南方电网有限责任公司 | Switch failure protection method using electric network wide area information |
| CN108963994A (en) * | 2018-08-13 | 2018-12-07 | 三峡大学 | A kind of transmission line of electricity optical-fibre channel acceleration distant place back-up protection method |
| US20190280476A1 (en) * | 2018-03-07 | 2019-09-12 | Southern States, Llc | Direction-to-fault and zone-based distance-to-fault electric power sectionalizer systems |
| CN110912090A (en) * | 2019-11-27 | 2020-03-24 | 电子科技大学 | Rapid intervention method for backup protection of electric power system distance II section |
-
2020
- 2020-04-17 CN CN202010304322.0A patent/CN111682509A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621217A (en) * | 2009-08-18 | 2010-01-06 | 北京四方继保自动化股份有限公司 | Protection system for area electric network data sharing |
| CN102496916A (en) * | 2011-11-30 | 2012-06-13 | 中国南方电网有限责任公司 | Switch failure protection method using electric network wide area information |
| US20190280476A1 (en) * | 2018-03-07 | 2019-09-12 | Southern States, Llc | Direction-to-fault and zone-based distance-to-fault electric power sectionalizer systems |
| CN108963994A (en) * | 2018-08-13 | 2018-12-07 | 三峡大学 | A kind of transmission line of electricity optical-fibre channel acceleration distant place back-up protection method |
| CN110912090A (en) * | 2019-11-27 | 2020-03-24 | 电子科技大学 | Rapid intervention method for backup protection of electric power system distance II section |
Non-Patent Citations (1)
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| 王增超: "智能变电站站域保护构建模式", 《电力系统及其自动化学报》 * |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20201014 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: XJ Group Corp. Applicant after: XJ ELECTRIC Co.,Ltd. Applicant after: XUCHANG XUJI SOFTWARE TECHNOLOGY Co.,Ltd. Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute Applicant after: STATE GRID CORPORATION OF CHINA Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: XJ Group Corp. Applicant before: XJ ELECTRIC Co.,Ltd. Applicant before: XUCHANG XUJI SOFTWARE TECHNOLOGY Co.,Ltd. Applicant before: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Applicant before: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute |
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Application publication date: 20200918 |
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