CN107895939B - Method for developing feeder terminal of power distribution network supporting open communication - Google Patents
Method for developing feeder terminal of power distribution network supporting open communication Download PDFInfo
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- CN107895939B CN107895939B CN201711144687.6A CN201711144687A CN107895939B CN 107895939 B CN107895939 B CN 107895939B CN 201711144687 A CN201711144687 A CN 201711144687A CN 107895939 B CN107895939 B CN 107895939B
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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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Abstract
The invention discloses a method for developing a feeder terminal of a power distribution network supporting open communication, which comprises a centralized relay protection method, wherein a system is detected to obtain a fault total signal and a split-phase signal; judging whether the automatic resetting time is reached or not, and judging whether a fault tripping function can be put into operation or not; transmitting a protection tripping signal and a separate command, checking the current and judging whether the switch is opened or not; if the switching-on is performed, a reclosing signal is obtained, the fault current is detected, if not, the switching-on is finished, and if yes, a switching-off command is sent; if the current judgment switch is disconnected, ending; if the current judges that the switch is closed, a switch tripping failure signal is sent out, and the task is ended. The advantages are that: the method can rapidly judge and jump the switch, and cut off the corresponding fault line; the fault can be quickly removed, and the power supply of the whole circuit can be recovered; the overcurrent protection function and the reclosing function can be flexibly switched on/off, and the overcurrent detection time limit and the reclosing waiting time can be flexibly configured according to the needs.
Description
Technical Field
The invention relates to a method for developing a feeder terminal of a power distribution network supporting open communication.
Background
With the deep advancement of smart grid construction and the rapid development of the power industry, the requirements of users on power supply quality and power supply reliability are higher and higher, and the power departments are required to provide safe, economical, reliable and high-quality electric energy. The intelligent power distribution network is an important ring in the construction of the intelligent power grid, integrates the modern computer technology and the communication network technology, and carries out remote real-time monitoring, coordination and control on equipment on the power distribution network, which is a necessary trend of the modern development of the power system. The current distribution system is developed to an open, integrated and integrated comprehensive automation direction, so that the running reliability and efficiency of the distribution network are improved, the power supply quality is improved, the labor intensity is reduced, the capability of the existing equipment is fully utilized, the power failure time is shortened, the power failure area is reduced, and the like, and considerable economic and social benefits are brought to the power supply system.
For centralized relay protection, when a line fails, the line needs to be rapidly judged and the switch is tripped, and the failed line is cut off to restore power supply.
Disclosure of Invention
The invention aims to provide a method for developing a feeder terminal of a power distribution network supporting open communication, which can effectively solve the problem that the existing centralized relay protection needs to quickly cut off a fault line.
In order to solve the technical problems, the invention is realized by the following technical scheme: the development method of the feeder terminal of the power distribution network supporting open communication comprises a centralized relay protection method, which sequentially comprises the following steps:
step one: detecting whether the line current i is greater than a set value Tk or not, and detecting whether the fault time t1 is greater than the set value Tk or not at the same time, and acquiring a fault total signal and a split-phase signal;
step two: judging whether the automatic resetting time is reached or not, and judging whether a fault tripping function can be put into operation or not;
step three: acquiring a fault total signal and a split-phase signal, wherein the automatic reset time is up, and the fault tripping function can be put in, sends a protection tripping signal and a separate command, and checks whether the current judges whether the switch is opened or not;
step four: if the current judges that the switch is closed, the tripping failure of the switch is sent out, and the automatic resetting time input is ended; if the current judging switch is a switching-off switch, switching-on and switching-off functions are input, and switching-off time t2> Ty;
step five: obtaining a reclosing signal, sending a switching command, judging whether fault current is detected again within the time t which is less than or equal to 500ms after the command is sent, if not, ending, and returning to the step one after automatically resetting the time; if yes, accelerating tripping, sending a switch-off command, checking current and judging whether the switch is switched off or not;
step six: if the current judging switch is switched off, ending, and returning to the step one after automatically resetting the time; and if the current judges that the switch is closed, a switch tripping failure signal is sent out, the task is ended, and after the time is automatically reset, the step I is returned.
Compared with the prior art, the invention has the advantages that: when faults such as short circuit occur to the circuit, the circuit can be rapidly judged and the switch is jumped, and the corresponding fault circuit is cut off; when the line has transient faults, the faults can be rapidly removed and the power supply of the whole line can be recovered by configuring a reclosing function; the overcurrent protection function and the reclosing function can be flexibly switched on/off, and the overcurrent detection time limit and the reclosing waiting time can be flexibly configured according to the needs.
Drawings
Fig. 1 is a flow chart of a centralized relay protection method in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1, in an embodiment of the invention, the method for developing a feeder terminal of a power distribution network supporting open communication includes a centralized relay protection method, which sequentially includes the following steps:
step one: detecting whether the line current i is greater than a set value Tk or not, and detecting whether the fault time t1 is greater than the set value Tk or not at the same time, and acquiring a fault total signal and a split-phase signal;
step two: judging whether the automatic resetting time is reached or not, and judging whether a fault tripping function can be put into operation or not;
step three: acquiring a fault total signal and a split-phase signal, wherein the automatic reset time is up, and the fault tripping function can be put in, sends a protection tripping signal and a separate command, and checks whether the current judges whether the switch is opened or not;
step four: if the current judges that the switch is closed, the tripping failure of the switch is sent out, and the automatic resetting time input is ended; if the current judging switch is a switching-off switch, switching-on and switching-off functions are input, and switching-off time t2> Ty;
step five: obtaining a reclosing signal, sending a switching command, judging whether fault current is detected again within the time t which is less than or equal to 500ms after the command is sent, if not, ending, and returning to the step one after automatically resetting the time; if yes, accelerating tripping, sending a switch-off command, checking current and judging whether the switch is switched off or not;
step six: if the current judging switch is switched off, ending, and returning to the step one after automatically resetting the time; and if the current judges that the switch is closed, a switch tripping failure signal is sent out, the task is ended, and after the time is automatically reset, the step I is returned.
And a full-industrial-level high-speed dual-core CPU with a main frequency as high as 400M is adopted, and an embedded real-time multi-task operating system is adopted to rapidly and comprehensively sample, detect and identify faults of a distribution line. The device is designed in a standardized way, so that the complexity of hardware is greatly simplified, and the reliability of the hardware is improved.
Each line has the protection functions of overcurrent protection, overload protection, zero sequence current protection, reclosing and the like, so that the faults of branch lines can be effectively removed, and the power failure range is reduced. And the distributed FA functionality may be configured by guard latency.
The overcurrent protection device is designed with an overcurrent relay protection function and a one-time reclosing function, wherein the overcurrent relay protection function is associated with a low-voltage locking function, namely when the overcurrent protection function needs to be realized, the low-voltage locking function needs to be correspondingly input and a low-voltage locking fixed value is set. The overcurrent relay protection function is applied to branch lines, demarcation points or line end switches. When faults such as short circuit occur on the circuit, the circuit can be rapidly distinguished and the switch is jumped, and the corresponding fault circuit is cut off. When the line has transient faults, the faults can be removed rapidly by configuring a reclosing function, and the power supply of the whole line can be recovered. The overcurrent protection function and the reclosing function can be flexibly switched on/off, and the overcurrent detection time limit and the reclosing waiting time can be flexibly configured according to the needs.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (1)
1. The development method of the feeder terminal of the power distribution network supporting open communication is characterized by comprising the following steps of: the protection method of the centralized relay comprises the following steps in sequence:
step one: detecting whether the line current i is greater than a set value Tk or not, and detecting whether the fault time t1 is greater than the set value Tk or not at the same time, and acquiring a fault total signal and a split-phase signal;
step two: judging whether the automatic resetting time is reached or not, and judging whether a fault tripping function can be put into operation or not;
step three: acquiring a fault total signal and a split-phase signal, wherein the automatic reset time is up, and the fault tripping function can be put in, sends a protection tripping signal and a separate command, and checks whether the current judges whether the switch is opened or not;
step four: if the current judges that the switch is closed, the tripping failure of the switch is sent out, and the automatic resetting time input is ended; if the current judging switch is a switching-off switch, switching-on and switching-off functions are input, and switching-off time t2> Ty;
step five: obtaining a reclosing signal, sending a switching command, judging whether fault current is detected again within the time t which is less than or equal to 500ms after the command is sent, if not, ending, and returning to the step one after automatically resetting the time; if yes, accelerating tripping, sending a switch-off command, checking current and judging whether the switch is switched off or not;
step six: if the current judging switch is switched off, ending, and returning to the step one after automatically resetting the time; and if the current judges that the switch is closed, a switch tripping failure signal is sent out, the task is ended, and after the time is automatically reset, the step I is returned.
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| CN201711144687.6A CN107895939B (en) | 2017-11-17 | 2017-11-17 | Method for developing feeder terminal of power distribution network supporting open communication |
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| CN201711144687.6A CN107895939B (en) | 2017-11-17 | 2017-11-17 | Method for developing feeder terminal of power distribution network supporting open communication |
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| CN107895939A CN107895939A (en) | 2018-04-10 |
| CN107895939B true CN107895939B (en) | 2023-04-21 |
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| CN114776571B (en) * | 2021-06-18 | 2023-11-14 | 上海华电电力发展有限公司望亭发电分公司 | Pump protection and verification system and method |
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| CN201029200Y (en) * | 2006-07-21 | 2008-02-27 | 北京四方华能电气设备有限公司 | Intelligent demarcation load switch |
| CN101572403A (en) * | 2009-06-10 | 2009-11-04 | 山东大学 | Fast current protection method with channel applicable to distribution networks containing DGs |
| CN102611082A (en) * | 2011-11-29 | 2012-07-25 | 陕西电力科学研究院 | Self-adaptive feeder neighborhood interactive fault-tolerant relay protection method for power distribution network |
| CN102904228A (en) * | 2012-10-17 | 2013-01-30 | 南京因泰莱配电自动化设备有限公司 | Protection method and protection device of power distribution network |
| CN104767182A (en) * | 2015-01-20 | 2015-07-08 | 国家电网公司 | Fault processing method for overhead line type power distribution network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003070151A (en) * | 2001-08-27 | 2003-03-07 | Toshiba Corp | Protective relay |
| US8159362B2 (en) * | 2005-10-18 | 2012-04-17 | Schweitzer Engineering Laboratories, Inc. | Method of detecting faults using graduated fault detection levels |
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| CN201029200Y (en) * | 2006-07-21 | 2008-02-27 | 北京四方华能电气设备有限公司 | Intelligent demarcation load switch |
| CN101572403A (en) * | 2009-06-10 | 2009-11-04 | 山东大学 | Fast current protection method with channel applicable to distribution networks containing DGs |
| CN102611082A (en) * | 2011-11-29 | 2012-07-25 | 陕西电力科学研究院 | Self-adaptive feeder neighborhood interactive fault-tolerant relay protection method for power distribution network |
| CN102904228A (en) * | 2012-10-17 | 2013-01-30 | 南京因泰莱配电自动化设备有限公司 | Protection method and protection device of power distribution network |
| CN104767182A (en) * | 2015-01-20 | 2015-07-08 | 国家电网公司 | Fault processing method for overhead line type power distribution network |
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