CN112688281A - Regional bus protection system and method for power distribution network - Google Patents
Regional bus protection system and method for power distribution network Download PDFInfo
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- CN112688281A CN112688281A CN202011571484.7A CN202011571484A CN112688281A CN 112688281 A CN112688281 A CN 112688281A CN 202011571484 A CN202011571484 A CN 202011571484A CN 112688281 A CN112688281 A CN 112688281A
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Abstract
A regional bus protection system of a power distribution network is divided into a next-stage station and a previous-stage station, wherein the next-stage station is a switching station/power distribution room, and a protection, measurement and control integrated device and a regional bus protection device are arranged in the switching station/power distribution room; a comprehensive bus protection device is configured at the upper-level station; the protection, measurement and control integrated device completes the traditional functions of current and voltage sampling, position signal acquisition, protection and control of an outlet and the like; and the regional bus protection device is additionally arranged in the switching station/power distribution room, and the regional bus protection device firstly has the principle and the function of conventional bus protection, and can reliably act on various types of faults in a protection area and cannot act on faults outside the protection area. The invention enhances the protection selectivity of the series power supply circuit so as to meet the requirements of reliability, selectivity, sensitivity and quick action of relay protection, reduce the fault power failure range and improve the power supply reliability.
Description
Technical Field
The invention belongs to analysis of a protection principle of a power distribution network, and particularly relates to research of a regional bus protection principle of a switching station/power distribution room applicable to voltage classes of 35kV and below.
Background
The relay protection of a 3 kV-110 kV power grid generally follows a far backup principle, wherein a single-side power supply line of a 35kV or below power grid is generally provided with three-section type overcurrent protection, and a composite voltage locking element is additionally arranged if necessary. When the setting calculation is difficult to simultaneously meet the requirements of selectivity, sensitivity and quick-break performance, the sensitivity coefficient needs to be ensured to meet the standard requirement, and the quick-break protection can be operated without selection, but the automatic reclosing is used for repairing.
For a series power supply line, the action time of power supply side protection is too long according to a stepwise matching principle, when a switching station matched with and constructed by a newly-built urban house is connected with a power supply from an electric power system, the unified management of a power grid company is required, in order to avoid the problem that the action time of system side protection is too long, the delay of power supply inlet wire overcurrent protection of the switching station is required to be very short, even only 0.3s, all inlet wires and outlet wires of the switching station and a subordinate power distribution room are cable lines and have short distance, reclosing is not thrown, the protection setting matching is difficult, and the problem that one point of fault jumps to one line exists in the series power supply line.
Disclosure of Invention
The invention mainly solves the technical problem of protection setting matching of a distribution line terminal switching station and a lower-level distribution room, and provides a novel distribution network regional bus protection system and a method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a regional bus protection system of a power distribution network is divided into a next-stage station and a previous-stage station, wherein the next-stage station is a switching station/power distribution room, and a protection, measurement and control integrated device and a regional bus protection device are arranged in the switching station/power distribution room; a comprehensive bus protection device is configured at the upper-level station;
the protection, measurement and control integrated device completes the traditional functions of current and voltage sampling, position signal acquisition, protection and control of an outlet and the like; and the regional bus protection device is additionally arranged in the switching station/power distribution room, and the regional bus protection device firstly has the principle and the function of conventional bus protection, and can reliably act on various types of faults in a protection area and cannot act on faults outside the protection area.
In the communication setting, two optical interfaces are respectively added on a conventional protection, measurement and control integrated device and a bus protection device, so that the communication between the regional bus protection device and the protection, measurement and control integrated device is realized, and meanwhile, the communication between the regional bus protection device of the next-stage station and the comprehensive bus protection device of the previous-stage station is realized.
A protection method for a regional bus of a power distribution network based on the system is used for carrying out regional division on the power distribution network, and the protection method comprises the following steps:
the regional bus protection device collects all incoming/outgoing line cabinet currents, bus voltages, switch position signals and protection fixed values in the region to judge whether a fault range is the region or not and distinguish bus faults and outgoing line faults; and the incoming/outgoing line cabinets in the area are adjusted and matched according to the level difference, and the internal fault of the lower-level area is locked for the protection of the upper-level area.
The incoming/outgoing line cabinets in the area are matched in a level difference mode, and before the protection, measurement and control integrated device performs protection action, a tripping-allowed signal sent by an area type bus protection device needs to be received; the regional bus protection device distinguishes bus faults and outlet faults: firstly, when the regional bus protection device judges that the fault range is bus fault, an outlet trips and sends a trip-permitting signal to a protection, measurement and control integrated device in a region; when the regional bus protection device judges that the fault range is an outlet fault, a tripping-allowed signal is sent to the protection, measurement and control integrated device of the fault line, and a locking signal is sent to the comprehensive bus protection device of the previous station, so that the protection, the measurement and control integrated device of the previous station is ensured to be reliable and does not act.
According to the technical scheme, the distribution network is divided into areas, protection is carried out according to the areas, the incoming/outgoing line cabinets in the areas are adjusted and matched according to the level difference, faults in lower-level areas are locked to protect the upper-level areas, and the traditional series power supply line is adjusted and matched step by step. Therefore, the selectivity of the protection of the series power supply circuit is enhanced, the reliability, selectivity, sensitivity and quick action required by relay protection are met, the fault power failure range is reduced, and the power supply reliability is improved.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic wiring diagram of a system side and a user side switching station of a 10kV switching station.
Fig. 3 is a wiring schematic of a utility power distribution room and a residential power distribution room.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Therefore, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention, on the basis of which all other embodiments, obtained by a person of ordinary skill in the art without inventive faculty, fall within the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the regional bus protection system for a power distribution network is divided into a next station and a previous station. The next-level station is a switching station/power distribution room, and a protection, measurement and control integrated device and a regional bus protection device are arranged in the switching station/power distribution room; and the comprehensive bus protection device is configured at the upper-level station.
When the system is set, a switching station or a power distribution room is divided into a protection area, 1 set of protection, measurement and control integrated device is configured at each wire inlet/outlet interval of the switching station/the power distribution room according to the conventional method, and the protection, measurement and control integrated device completes the traditional functions of current and voltage sampling, position signal acquisition, protection and control outlet and the like; and the regional bus protection device is additionally arranged in the switching station/power distribution room, and the regional bus protection device firstly has the principle and the function of conventional bus protection, and can reliably act on various types of faults in a protection area and cannot act on faults outside the protection area. The power distribution room and the previous-stage station are divided into areas through the area type bus protection device, and the protection coordination of incoming and outgoing lines in the areas and the linkage locking between the upper-stage area and the lower-stage area are achieved.
In the communication setting, two optical interfaces are respectively added on a conventional protection, measurement and control integrated device and a bus protection device, so that the communication between the regional bus protection device and the protection, measurement and control integrated device is realized, and meanwhile, the communication between the regional bus protection device at the next-level station and the comprehensive bus protection device at the previous-level station is realized, so that the point-to-point communication is realized, and the communication reliability is guaranteed.
The regional bus protection device collects the voltage of each section of bus of the switching station/power distribution room, communicates with the protection measurement and control integrated device of each interval through the optical interface, collects the current, the switch position, the protection action signal and the protection constant value of each interval, and transmits opening or closing information.
A protection method of a regional bus of a power distribution network is used for carrying out regional division on the power distribution network, and the protection method comprises the following steps:
the regional bus protection device collects all incoming/outgoing line cabinet currents, bus voltages, switch position signals and protection fixed values in the region to judge whether a fault range is the region or not and distinguish bus faults and outgoing line faults; and the incoming/outgoing line cabinets in the area are adjusted and matched according to the level difference, and the internal fault of the lower-level area is locked for the protection of the upper-level area.
Specifically, the incoming/outgoing line cabinets in the area are matched in level difference, and before protection action, the protection, measurement and control integrated device needs to receive an allowable tripping signal sent by the area type bus protection device, so that compared with the traditional protection, a logic condition is added. The regional bus protection device distinguishes and applies bus faults and outlet faults: firstly, when the regional bus protection device judges that the fault range is bus fault, an outlet trips and sends a trip-permitting signal to a protection, measurement and control integrated device in a region; when the regional bus protection device judges that the fault range is an outlet fault, a tripping-allowed signal is sent to the protection, measurement and control integrated device of the fault line, and a locking signal is sent to the comprehensive bus protection device of the previous station, so that the protection, the measurement and control integrated device of the previous station is ensured to be reliable and does not act.
Fig. 2 and 3 are schematic wiring diagrams of the overall system of the present invention. When a metallic short circuit occurs at the point d1, the protection, measurement and control integrated device installed on the H3 cabinet and the H1 cabinet of the 2# residential power distribution room and the H6 cabinet and the H10 cabinet of the 10kV switching station at the user side detect a fault current, the protection is started reliably, and as the H10 cabinet of the 10kV switching station is set to be 0.3s according to the requirements of a power supply company, the protection of the 4 cabinets cannot be matched through a setting value and time delay, the selectivity is lost, and the selectivity cannot be increased through a direction protection and composite voltage locking element. The reclosing is not thrown, and the influence caused by the loss of selectivity of the reclosing device cannot be compensated.
The following judgments can be made with the zone bus protection device of # 2 residential power distribution room: the differential current is smaller than the action current, and is an out-of-range fault; h1 cabinet current break amount is larger than the set value; the H3 cabinet current break amount is larger than the set value and the amplitude is larger than the overcurrent protection set value. When the conditions are met, the fault range can be judged to be the fault of the outgoing line side of the power distribution room H3 cabinet, a trip allowing signal is sent to the H3 cabinet protection device through the communication interface, and the trip allowing signal is not sent to the H1 cabinet protection device; and sending a locking tripping signal to the regional bus protection device of the 10kV switching station at the user side, wherein after receiving the locking tripping signal, the regional bus protection device of the switching station does not send a tripping allowing signal to the protection devices of the H6 and H10 cabinets.
Other cooperation descriptions:
1. failure fails to be handled by removal. After the H3 cabinet protection device receives the trip-permitting signal, the trip-permitting signal is output after meeting the relevant conditions of action value, time delay and the like, and the protection action signal is sent to a regional bus protection device, and the bus protection device judges that the fault is reliably removed when detecting that the fault current of the H3 and H1 cabinets disappears, otherwise, the fault is not removed, and sends the trip-permitting signal to the H1 cabinet protection device and removes the blocking trip-out signal of the power distribution room and the upper-level switching station;
2. handling of communication failures and device failures. When the regional bus protection device is in self-checking failure, a tripping allowing signal is sent to other protection devices of the switching station/power distribution room, and a locking tripping signal is not sent to an upper-level switching station; when the protection device of each interval detects a communication fault, the trip-allowed locking condition of the device is released;
3. when the regional bus protection device judges that a fault occurs in a protection region, a tripping command and a tripping allowing signal are sent to all in-out line cabinet protection devices of a power distribution room or a switching station in the region, and a blocking tripping signal is not sent to an upper-level switching station;
4. setting the incoming and outgoing line protection delay in each area: the time limit over-current delay of the incoming cabinet can be set to 0.3s, and the time limit over-current delay of the outgoing cabinet can be set to 0.15 s.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, however, as long as there is no contradiction between the combinations of the technical features, the combinations of the technical features should be considered as being within the scope described in the present specification, and when the combinations of the technical features are contradictory or cannot be realized, the combinations of the technical features should be considered as not being present, and the combinations of the technical features are not within the scope of the claims. Also, it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the spirit of the principles of the invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (4)
1. The utility model provides a regional type generating line protection system of distribution network, this system divide into next level station institute and last level station institute, its characterized in that: the next-stage station is a switching station/power distribution room, and a protection, measurement and control integrated device and a regional bus protection device are arranged in the switching station/power distribution room; a comprehensive bus protection device is configured at the upper-level station;
the protection, measurement and control integrated device completes the traditional functions of current and voltage sampling, position signal acquisition, protection and control of an outlet and the like; and the regional bus protection device is additionally arranged in the switching station/power distribution room, and the regional bus protection device firstly has the principle and the function of conventional bus protection, and can reliably act on various types of faults in a protection area and cannot act on faults outside the protection area.
2. The power distribution network area bus protection system of claim 1, wherein: in the communication setting, two optical interfaces are respectively added on a conventional protection, measurement and control integrated device and a bus protection device, so that the communication between the regional bus protection device and the protection, measurement and control integrated device is realized, and meanwhile, the communication between the regional bus protection device of the next-stage station and the comprehensive bus protection device of the previous-stage station is realized.
3. A protection method for a regional bus of a power distribution network based on the system of claim 1 is used for carrying out regional division on the power distribution network, and comprises the following steps:
the regional bus protection device collects all incoming/outgoing line cabinet currents, bus voltages, switch position signals and protection fixed values in the region to judge whether a fault range is the region or not and distinguish bus faults and outgoing line faults; and the incoming/outgoing line cabinets in the area are adjusted and matched according to the level difference, and the internal fault of the lower-level area is locked for the protection of the upper-level area.
4. The method for protecting the regional bus of the power distribution network according to claim 3, wherein: the incoming/outgoing line cabinets in the area are matched in a level difference mode, and before the protection, measurement and control integrated device performs protection action, a tripping-allowed signal sent by an area type bus protection device needs to be received; the regional bus protection device distinguishes bus faults and outlet faults: firstly, when the regional bus protection device judges that the fault range is bus fault, an outlet trips and sends a trip-permitting signal to a protection, measurement and control integrated device in a region; when the regional bus protection device judges that the fault range is an outlet fault, a tripping-allowed signal is sent to the protection, measurement and control integrated device of the fault line, and a locking signal is sent to the comprehensive bus protection device of the previous station, so that the protection, the measurement and control integrated device of the previous station is ensured to be reliable and does not act.
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| CN202011571484.7A CN112688281A (en) | 2020-12-27 | 2020-12-27 | Regional bus protection system and method for power distribution network |
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| CN202011571484.7A CN112688281A (en) | 2020-12-27 | 2020-12-27 | Regional bus protection system and method for power distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346461A (en) * | 2021-06-01 | 2021-09-03 | 南京征途信息技术有限公司 | Automatic power recovery method based on power distribution internet of things gateway |
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|---|---|---|---|---|
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN103887879A (en) * | 2014-03-25 | 2014-06-25 | 广州供电局有限公司 | Petal type power distribution network protection control system |
| CN205791493U (en) * | 2016-06-28 | 2016-12-07 | 国网江苏省电力公司无锡供电公司 | Distribution website institute integrated form relay protection system |
| CN109510192A (en) * | 2018-11-16 | 2019-03-22 | 深圳供电局有限公司 | Power distribution network and self-healing method thereof |
-
2020
- 2020-12-27 CN CN202011571484.7A patent/CN112688281A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN103887879A (en) * | 2014-03-25 | 2014-06-25 | 广州供电局有限公司 | Petal type power distribution network protection control system |
| CN205791493U (en) * | 2016-06-28 | 2016-12-07 | 国网江苏省电力公司无锡供电公司 | Distribution website institute integrated form relay protection system |
| CN109510192A (en) * | 2018-11-16 | 2019-03-22 | 深圳供电局有限公司 | Power distribution network and self-healing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346461A (en) * | 2021-06-01 | 2021-09-03 | 南京征途信息技术有限公司 | Automatic power recovery method based on power distribution internet of things gateway |
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