CN117937392A - Busbar acceleration protection device based on switching value mode - Google Patents
Busbar acceleration protection device based on switching value mode Download PDFInfo
- Publication number
- CN117937392A CN117937392A CN202311702485.4A CN202311702485A CN117937392A CN 117937392 A CN117937392 A CN 117937392A CN 202311702485 A CN202311702485 A CN 202311702485A CN 117937392 A CN117937392 A CN 117937392A
- Authority
- CN
- China
- Prior art keywords
- protection
- switching value
- busbar
- load
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 33
- 230000009471 action Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 3
- 206010000369 Accident Diseases 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a busbar acceleration protection device based on a switching value mode, which comprises a medium-voltage system busbar and an acceleration protection device, wherein the medium-voltage system busbar is respectively connected with a working power supply and a motor load through a circuit, and is respectively provided with a working power supply incoming line switch and a load power supply switch on a connecting circuit.
Description
Technical Field
The invention relates to a busbar acceleration protection device based on a switching value mode, and belongs to the technical field of relay protection and safety automatic devices.
Background
The medium-voltage bus of the power plant has more load intervals, and at present, a multi-interval bus difference protection meeting the requirements is not put into application cases. To increase the bus bar fault removal speed, it is conventional practice to use arc protection as the main protection, but arc protection is susceptible to the operating environment and the reliability of operation is not high. In order to improve the operation reliability of the medium-voltage bus, many power generation enterprises have taken the arc protection out of operation, and use time-limited current quick-break protection as the main protection of bus faults. The short-circuit current level of the medium-voltage bus in the power plant is higher, the inter-phase short circuit has great influence on the dynamic stability and the thermal stability of the bus, and severe events such as burning loss of equipment such as the bus and a switch can be caused, even fire accidents are caused, and the fault equipment needs to be repaired for a plurality of months, so that the lack of main protection with high action speed is very unfavorable for the safe and stable operation of the system.
From the demand of realizing the quick main protection of medium-voltage buses, a plurality of equipment manufacturers are in related technical attack, which shows that the station end has urgent demands on the technology, but the prior patent achievements cannot solve the practical problems, the closest to the solution is a CSC-150A type bus protection device developed by Beijing Fangzhi Hengbao automatic share limited company, the maximum three-phase differential access units are 24, and the differential protection is formed by adopting a ratio braking differential criterion, but the practical use requirements on site are still not met in terms of the usable interval, and even if the development is successful, the processing and the calculation of sampling data at a large amount of intervals are also problems to be discussed. From the actual demand of the user side, along with the continuous development of the power grid scale, in the increasingly strong electric power market competition, the improvement of the reliability and the stability of the power supply equipment is increasingly valued by the power plant. At present, the fault of the medium-voltage bus of the power plant cannot realize quick action, and the protection of other equipment basically realizes full-line quick action, such as: differential protection of the generator-transformer group, differential protection of the main transformer, differential protection of the factory transformer, differential connection of feeder guide wires, and the like.
In summary, a busbar acceleration protection device based on a switching value mode is designed, so that the above problems are overcome.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the busbar acceleration protection device based on the switching value mode, which has the advantages of simple structure, practicality, convenience, high reliability and strong stability, is not limited by the number of busbar load intervals in principle, solves the technical problem that the medium-voltage busbar fault has no rapid main protection, and improves the safety and stability of the operation of the medium-voltage busbar in a power plant.
The invention is realized by the following technical scheme: the utility model provides a busbar acceleration protection device based on switching value mode, includes middling pressure system busbar and the acceleration protection device who is connected with middling pressure system busbar, and this middling pressure system busbar is connected with working power supply and motor load respectively through the circuit to be provided with working power supply inlet wire switch and load switch on working power supply and motor load and the connecting wire of middling pressure system busbar respectively, acceleration protection device comprises working inlet wire switch microcomputer protection, load switch microcomputer protection, switching value collection busbar and switching value signal acquisition module, wherein the one end of load switch microcomputer protection links to each other with switching value collection busbar through the circuit, and its other end is connected with load power supply switch through the circuit for overload short-circuit's fault protection, and the one end of working inlet wire switch microcomputer protection links to each other with working power supply inlet wire switch through the circuit, and switching value signal acquisition module links to each other with switching value collection busbar, and this switching value collection busbar is used for gathering the front end locking signal that load switch microcomputer protection put forward.
As preferable: the medium voltage system bus is connected with a standby power supply through a line, and a standby power supply inlet wire switch is arranged on the line, the standby power supply inlet wire switch is connected with one end of the standby inlet wire switch microcomputer protection through the line, and the other end of the standby inlet wire switch microcomputer protection is connected with the signal acquisition module through the line.
As preferable: the motor load consists of at least one medium-voltage motor load and at least one low-voltage system load, and the medium-voltage motor load and the low-voltage system load are arranged in parallel.
As preferable: the switching value signal acquisition module has an on-off action voltage of 55% -70% of rated direct current power supply voltage, and the action power is not lower than 5W, so that misoperation locking caused by external factor interference is prevented.
As preferable: the front end locking signal of the load switch microcomputer protection switch adopts a current quick-break protection starting signal without delay.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the technical problem that the multi-interval medium-voltage bus of the power generation enterprise has no rapid and reliable main protection, accelerates the fault removal time of the bus, ensures the operation safety of the bus and the switch equipment, and can effectively prevent fire accidents caused by short circuit faults of the bus. The method has the characteristics of simplicity, reliability, strong operability, low transformation cost and the like in the implementation mode, is very suitable for power plants or other power enterprises with more bus intervals, and has good popularization prospect.
(2) The invention mainly aims at optimizing and upgrading the existing microcomputer protection device, plays the functions of the existing microcomputer protection device to the maximum use, realizes deep diving, has low requirements on the configuration of protection hardware, does not need to collect and operate a large amount of data compared with the traditional multi-interval analog differential protection, and is easier to realize in principle.
(3) The invention maintains the setting configuration of the original switch protection, even if the newly added bus acceleration protection fails due to various problems, the action behavior of other overcurrent protection is not influenced, the fault removal still has selectivity, the accident range is prevented from being enlarged, the multiple guarantee function is provided, and the safety and the reliability of bus operation are improved to the maximum extent.
The invention relates to a medium-voltage bus acceleration protection based on a switching value mode, which is mainly used for solving the technical problem that a multi-interval medium-voltage bus is not subjected to rapid fault removal main protection. On the premise of not changing the protection configuration of the original medium-voltage bus power supply inlet wire switch, logic optimization is carried out on the basis of the protection configuration, and a current quick-break acceleration protection is additionally configured to serve as a quick main protection for the medium-voltage bus faults. The protection is blocked by an external switching quantity, which is used to distinguish between internal faults of the bus and external faults of the bus. Therefore, the protection does not need to be matched with microcomputer protection of a bus load switch in a time setting manner, so that the fault can be removed by accelerating action when the internal fault of the bus occurs, and the bus is reliably locked when the external fault occurs. The method has the characteristics of simple and reliable implementation mode, strong operability, low transformation cost and the like, is suitable for power plants or other power enterprises with more bus intervals, and has good popularization prospect.
Drawings
Fig. 1 is a schematic wiring diagram of the present invention.
Fig. 2 is a logic diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples below in order to more clearly understand the objects, technical solutions and advantages of the present invention to those skilled in the art.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," "transverse," "vertical," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the present invention, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the invention.
The invention will be described in detail below with reference to the attached drawings: as shown in fig. 1, a busbar acceleration protection device based on switching value mode includes a medium voltage system busbar 1 and an acceleration protection device connected with the medium voltage system busbar 1, where the medium voltage system busbar 1 is connected with a working power supply 2 and a motor load 3 respectively through lines, and a working power supply inlet switch 4 and a load power switch 5 are respectively arranged on the connecting lines of the working power supply 2 and the motor load 3 and the medium voltage system busbar 1, and is characterized in that: the acceleration protection device consists of a working incoming line switch microcomputer protection 6, a load switch microcomputer protection 7, a switching value acquisition busbar 8 and a switching value signal acquisition module 9, wherein one end of the load switch microcomputer protection 7 is connected with the switching value acquisition busbar 9 through a circuit, the other end of the load switch microcomputer protection 7 is connected with the load power switch 5 through a circuit for overload short-circuit fault protection, one end of the working incoming line switch microcomputer protection 6 is connected with the working power incoming line switch 4 through a circuit, the other end of the working incoming line switch microcomputer protection 6 is connected with the switching value signal acquisition module 9, the switching value signal acquisition module 9 is connected with the switching value acquisition busbar 8 through a circuit, and the switching value acquisition busbar 8 is used for summarizing front end locking signals opened by the load switch microcomputer protection 7.
The medium voltage system bus 1 is connected with a standby power supply 10 through a line, and is provided with a standby power supply inlet switch 11, the standby power supply inlet switch 11 is connected with one end of a standby inlet switch microcomputer protection 12 through a line, and the other end of the standby inlet switch microcomputer protection 12 is connected with a switching value signal acquisition module 9 through a line.
The switching value signal acquisition module 9 acquires and analyzes the front end locking signal, judges whether the load is a fault, if so, judges that the load is out-of-zone fault, locks the working power supply inlet wire switch and the standby power supply inlet wire switch, and otherwise, does not work.
The motor load 3 is composed of at least one medium-voltage motor load 13 and at least one low-voltage system load 14, and the medium-voltage motor load 13 and the low-voltage system load 14 are arranged in parallel.
The switching value signal acquisition module 9 has an on-off action voltage of 55% -70% of the rated direct current power supply voltage, and the action power is not lower than 5W, so that misoperation locking caused by external factor interference is prevented. The front end locking signal of the load switch microcomputer protection 7 adopts a current quick-break protection starting signal without delay.
The invention carries out logic optimization on the basis of the original medium-voltage bus power supply inlet wire switch protection configuration without changing the same, and additionally configures a current quick-break acceleration protection as a quick main protection for the medium-voltage bus faults. The protection is blocked by an external switching value, and the switching value is used for distinguishing internal faults of the bus from external faults of the bus, so that the time for cutting off faults of the medium-voltage bus in the power plant is greatly shortened.
The working principle of the invention is as follows:
The invention maintains the microcomputer protection configuration mode of the original medium-voltage bus power supply inlet switch, optimizes the logic thereof on the basis of the protection device, and newly adds a current quick-break acceleration protection I >, wherein the protection is locked by external opening and closing conditions. When the medium-voltage bus normally operates, the newly-increased current quick-break acceleration protection is in a locking state; when the external switching-in contact is logic '1', and the starting signal of the time-limited quick-break protection I > of the incoming line switch is logic '1', judging that the external switching-in contact is out of the area fault, and locking the newly-increased current quick-break protection; when the external switching-in contact is logic '0', and the starting signal of the time-limited quick-break protection I > of the incoming line switch is logic '1', judging that the bus is in fault, opening the newly-increased current quick-break protection, and accelerating the action to cut off the bus fault. Therefore, the current quick-break protection is not matched with microcomputer protection of the bus load switch in time in principle, so that the fault of the medium-voltage bus can be cut off in an accelerating way, and the bus acceleration protection based on a switching value mode is realized. The schematic diagram and the logic schematic diagram are respectively shown in fig. 1 and fig. 2. It should be noted that, in order to ensure the stable and reliable exit of the rapid-break acceleration protection of the newly-increased current, a short delay of a cycle needs to be added, so as to avoid the problem of data acquisition delay.
The external opening and closing locking contact of the newly added current quick-break acceleration protection is output by a switching value signal acquisition module, the switching value locking contact opened by the switching value signal acquisition module is defined as an external locking contact in the figure 2, and when the switching value signal acquisition module is opened to be logic '1', an instantaneous opening and closing locking signal is sent to the microcomputer protection opening end of the original bus inlet wire switch to serve as a logic condition for locking the newly added current quick-break acceleration protection. When the switching value signal acquisition module is switched in to be logic '0', the signal acquisition module does not output a locking signal and is used as a logic condition for opening the newly added current quick-break acceleration protection.
The switching value signal acquisition module is connected with the switching value acquisition busbar, and when the busbar is at high potential, namely logic 1, the switching value signal acquisition module is switched on; when the busbar is at low potential, namely logic 0, the switching value signal acquisition module is started to be false.
The switching value collection busbar is used for summarizing front-end locking signals which are protected by all load switch microcomputers. When any load switch microcomputer protects the opening and closing locking signal, the small bus is at high potential, namely logic 1, and the opening and closing of the switching value signal acquisition module is true.
The front end locking signal protected by the load switch microcomputer is a current quick-break protection starting signal without delay, and the self-starting of the motor, the feedback current of the bus fault motor and the feedback current of the fault motor outside the bus area can be avoided because the current quick-break protection current fixed value is generally set larger, so that the false emission of the front end locking signal is effectively prevented. When a short circuit fault occurs to the load, namely, a fault outside the bus area occurs, the starting signal is sent out instantaneously, and the front end locking signal is logic '1'. It should be pointed out that all load switch microcomputer protection needs to be configured with a delay-free current quick-break protection starting signal output point, and is special for locking and opening bus acceleration protection.
In order to improve the reliability of the protection action, the invention reserves the original configuration function of the protection of the incoming line switch, prevents the acceleration protection refusal action of the newly added bus and enlarges the fault range, and can cut off the fault by the originally configured time-limited quick-break overcurrent or the overcurrent protection I > action of the incoming line switch at the moment, thereby comprehensively improving the operation reliability of the bus. For ease of understanding, fig. 2 is provided as a logic diagram of the present invention.
The invention is suitable for multi-interval medium voltage buses, and solves the technical problem that the multi-interval medium voltage buses of power generation enterprises are not provided with rapid and reliable main protection.
In terms of project feasibility, only the protection logic is needed to optimize, the switching values capable of judging the 'in-area' and the 'out-of-area' are introduced for locking, and a signal acquisition device is added.
In terms of operation and maintenance management, the bus acceleration protection based on the switching value mode is high in reliability, a large amount of current analog signals are not required to be introduced, the problems of short circuit and open circuit of a CT secondary circuit are avoided, and maintenance work is convenient.
In the aspect of application scenes, the project is suitable for all medium-voltage buses, is not influenced by the number of the using intervals, and has wide application range and good application prospect.
The specific embodiments described herein are merely illustrative of the principles and functions of the present invention, and are not meant to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.
Claims (5)
1. The utility model provides a busbar protection device that accelerates based on switching value mode, includes middling pressure system busbar (1) and is connected with middling pressure system busbar (1) acceleration protection device, and this middling pressure system busbar (1) are connected with working power supply (2) and motor load (3) respectively through the circuit to be provided with working power supply inlet wire switch (4) and load switch (5) respectively on working power supply (2) and motor load (3) and the connecting wire of middling pressure system busbar (1), its characterized in that: the acceleration protection device consists of a working inlet wire switch microcomputer protection (6), a load switch microcomputer protection (7), a switching value collection busbar (8) and a switching value signal collection module (9), wherein one end of the load switch microcomputer protection (7) is connected with the switching value collection busbar (9) through a circuit, the other end of the load switch microcomputer protection is connected with a load power switch (5) through a circuit and used for overload short-circuit fault protection, one end of the working inlet wire switch microcomputer protection (6) is connected with the working power inlet wire switch (4) through a circuit, the other end of the working inlet wire switch microcomputer protection is connected with the switching value signal collection module (9), the switching value signal collection module (9) is connected with the switching value collection busbar (8) through a circuit, and the switching value collection busbar (8) is used for summarizing front end locking signals opened by the load switch microcomputer protection (7).
2. The switching mode based bus acceleration protection device of claim 1, wherein: the medium voltage system bus (1) is connected with a standby power supply (10) through a line, a standby power supply inlet wire switch (11) is arranged on the line, the standby power supply inlet wire switch (11) is connected with one end of a standby inlet wire switch microcomputer protection (12) through the line, and the other end of the standby inlet wire switch microcomputer protection (12) is connected with a switching value signal acquisition module (9) through the line.
3. The switching mode based bus acceleration protection device of claim 1, wherein: the motor load (3) consists of at least one medium-voltage motor load (13) and at least one low-voltage system load (14), and the medium-voltage motor load (13) and the low-voltage system load (14) are arranged in parallel.
4. The switching mode based bus acceleration protection device of claim 2, wherein: the switching value signal acquisition module (9) has an on-off action voltage of 55% -70% of the rated direct current power supply voltage, and the action power is not lower than 5W, so that misoperation locking caused by external factor interference is prevented.
5. The switching mode based bus acceleration protection device of claim 1, wherein: the front end locking signal which is opened by the load switch microcomputer protection (7) adopts a current quick-break protection starting signal without delay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311702485.4A CN117937392A (en) | 2023-12-12 | 2023-12-12 | Busbar acceleration protection device based on switching value mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311702485.4A CN117937392A (en) | 2023-12-12 | 2023-12-12 | Busbar acceleration protection device based on switching value mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117937392A true CN117937392A (en) | 2024-04-26 |
Family
ID=90758265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311702485.4A Pending CN117937392A (en) | 2023-12-12 | 2023-12-12 | Busbar acceleration protection device based on switching value mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117937392A (en) |
-
2023
- 2023-12-12 CN CN202311702485.4A patent/CN117937392A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102270836B (en) | Wide-area over-current protection method and system for power distribution network | |
| CN109617026B (en) | Ultrahigh-speed protection method for earth fault of direct-current power grid converter station | |
| CN110829393A (en) | Current-limiting hybrid direct-current circuit breaker with active protection function and control method | |
| CN111865669A (en) | Intelligent decision making system and method for power grid fault recovery | |
| CN201601481U (en) | Arc light protecting device | |
| CN106684822A (en) | Transformer dead-zone fault protection method and breaker failure protection method | |
| CN202649381U (en) | GOOSE-based small-current grounding route selection system of intelligent transformer substation | |
| CN202586308U (en) | Comprehensive grounding protective device for microcomputer | |
| Jing et al. | Review on DC distribution network protection technology with distributed power supply | |
| CN113572193B (en) | Distributed power island operation state identification method, fusion terminal and system | |
| CN112968431B (en) | Automatic processing system for fault of CAN bus optical fiber internet +10KV feeder line | |
| CN116780488B (en) | New energy power station grounding protection system, method, electronic equipment and storage medium | |
| CN221530976U (en) | Bus acceleration protection device based on switching value mode | |
| CN107026433B (en) | Rapid protection system and method for current collection circuit of new energy power station | |
| CN110752664A (en) | Dual-power-supply fast switching device | |
| CN117937392A (en) | Busbar acceleration protection device based on switching value mode | |
| CN110896247A (en) | Automatic control system of bus coupler switch | |
| CN114285371A (en) | High-reliability intelligent monitoring communication combiner box and method for photovoltaic power generation system | |
| CN114825286A (en) | Method and system for quickly cutting off direct-current power distribution network | |
| CN109861179B (en) | Bus protection voltage switching method suitable for hand-in-hand power supply mode | |
| CN210669520U (en) | Current-limiting hybrid direct-current circuit breaker with active protection function | |
| CN110416977B (en) | Bus protection module for locking ground signal | |
| CN111313377B (en) | Station domain protection method and device integrating centralized reclosure | |
| CN201015166Y (en) | Signal lightning protection type automatic reclosed switch | |
| CN111211542A (en) | Fusion type power transmission line fault isolation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |