CN114050555A - Post-protection acceleration in-situ feeder automation fault processing method and system - Google Patents
Post-protection acceleration in-situ feeder automation fault processing method and system Download PDFInfo
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- CN114050555A CN114050555A CN202111241540.5A CN202111241540A CN114050555A CN 114050555 A CN114050555 A CN 114050555A CN 202111241540 A CN202111241540 A CN 202111241540A CN 114050555 A CN114050555 A CN 114050555A
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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 and a system for accelerating in-situ feeder automation fault processing after protection, wherein the method comprises the following steps: when a fault of a power distribution network line is detected, the transformer substation outgoing line protection device performs tripping, and the distribution feeder line terminal performs voltage loss brake separation; after the fault is confirmed to be removed, the substation outgoing line protection device executes reclosing, and the distribution feeder terminal executes incoming call closing; and after the distribution feeder terminal is switched on, performing accelerated detection after protection within Y time delay. The system comprises: the system comprises a transformer substation outgoing line protection module, a transformer substation outgoing line reclosing module and a feeder line terminal fault protection module. The invention can solve the problems that the traditional relay protection technology in the existing power distribution network fault isolation technology loses selectivity, the in-situ feeder automatic fault isolation and power restoration are carried out, the construction cost is increased by depending on communication or the communication unit time consumption is not depended on, the timely fault isolation and power restoration are provided for the transformer substation equipment, and the safe use of the transformer substation equipment is ensured.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a method and a system for automatically processing a post-protection accelerated in-situ feeder fault.
Background
The automatic construction of power distribution of state net company clearly points out that the automatic construction of power distribution should be promoted comprehensively, promotes the automatic application level of power distribution, constantly improves distribution network power supply reliability, power supply quality and efficiency benefit. The power distribution network line is used as a power transmission terminal line, has the characteristics of multiple sections, multiple branches, short transmission distance and the like, and loses the protection selectivity on the power distribution network line by the traditional relay protection technology.
At present, the field of power distribution networks mainly realizes fault isolation and power restoration of power distribution network lines through a feeder automation technology. The feeder automation technology is divided into two types of centralized feeder automation and local feeder automation, the centralized feeder automation depends on the communication cooperation of a feeder terminal and a power distribution main station, and once communication abnormity occurs, the whole power distribution network is out of protection; the on-site feeder line automation is divided into a recloser type feeder line and an intelligent distributed feeder line, when a permanent fault occurs in a line, the recloser type on-site feeder line automation needs to protect multiple tripping and reclosing actions and the switching on and off of each switch of a distribution network line through a substation outgoing line, the fault isolation consumes long time, and multiple impacts are caused to users and electric equipment; intelligent distributed in-place feeder automation also relies on communication between feeder terminals.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method and a system for accelerating post-protection local feeder automation fault processing, which can solve the problems that the traditional relay protection technology in the existing power distribution network fault isolation technology loses selectivity, and local feeder automation fault isolation and power restoration are performed, or communication is relied on to increase the construction cost, or communication is not relied on the unit consumption time of communication.
In a first aspect, an embodiment of the present invention provides a method for accelerated fault handling for in-place feeder automation after protection, where the method includes:
when a fault of a power distribution network line is detected, the outgoing line protection device of the transformer substation performs tripping, and the distribution feeder terminal performs voltage loss brake separation.
After the fault is confirmed to be removed, the substation outgoing line protection device executes reclosing, and the distribution feeder terminal executes incoming call closing.
And after the distribution feeder terminal is switched on, performing accelerated detection after protection within Y time delay.
In combination with the first aspect, the embodiments of the present invention provide a first possible implementation manner of the first aspect, wherein,
when detecting that distribution network line breaks down, the tripping operation is carried out to the protection device that is qualified for the next round of competitions of transformer substation, and the decompression separating brake is carried out to distribution feeder terminal, includes:
if the feeder terminal detects the fault for the first time, the switch tripping is not executed.
And if each feeder line terminal on the distribution network line detects that the two sides are in voltage loss, executing switch tripping. .
In combination with the first aspect, the embodiments of the present invention provide a second possible implementation manner of the first aspect, wherein,
after confirming that the fault is removed, the substation outgoing line protection device executes reclosing, and the distribution feeder terminal executes incoming call closing, and the method comprises the following steps:
if the current switch on the power distribution network line is positioned in the branch position, and the feeder line terminal detects that any side has pressure, and the time is more than or equal to X delay, the current switch is superposed.
And if the current switch on the power distribution network line is positioned in the branch position and the feeder line terminal detects that any side has pressure and the time is less than X delay, memorizing the reverse incoming call locking and not executing the superposition of the current switch.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where after the distribution feeder terminal is switched on, performing accelerated detection after protection within a Y delay includes:
after the switch is switched on, if the Y delay inner feeder terminal detects a fault, the switch is switched off in an accelerated mode after protection.
After the switch is switched on, if the Y delay inner feeder terminal does not detect the fault, the memory is locked for protection and then accelerated, and the memory is used for acceleration after the fault is detected again and the protection is not executed.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where a time X set by a substation outgoing line reclosing delay time is shorter than a time Y set by a feeder terminal fault protection delay time.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the post-protection acceleration includes overcurrent acceleration, zero-current acceleration, and zero-voltage acceleration, which are protection functions capable of correctly identifying an inter-phase short circuit and a ground fault.
In a second aspect, an embodiment of the present invention further provides a post-protection accelerated in-situ feeder automation fault handling system, where the system includes:
and the transformer substation outgoing line protection module is used for tripping the transformer substation outgoing line protection device when detecting that a power distribution network line fails, switching off under a loss of voltage at a power distribution feeder terminal, not executing switching-on and switching-off if the feeder terminal detects the failure for the first time, and executing switching-on and switching-off if the feeder terminals detect loss of voltage at two sides on the power distribution network line.
The transformer substation outgoing line reclosing module is used for confirming that after a fault is removed, the transformer substation outgoing line protection device executes reclosing, the power distribution feeder terminal executes incoming call closing, if the current switch on the power distribution network line is positioned at a separating position, and the feeder terminal detects that any side has pressure, time is more than or equal to X delay, the current switch is reclosed, if the current switch on the power distribution network line is positioned at a separating position, and the feeder terminal detects that any side has pressure, and time is less than X delay, reverse incoming call locking is memorized, and reclosing of the current switch is not executed.
And the feeder terminal fault protection module is used for performing accelerated detection after Y-delay internal protection after the power distribution feeder terminal is switched on, switching off the switch after protection if the Y-delay internal feeder terminal detects a fault after the switch is switched on, and accelerating after memory locking protection if the Y-delay internal feeder terminal does not detect a fault after the switch is switched on, and accelerating after the Y-delay internal feeder terminal detects no protection after the fault is detected again.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor, when executing the computer program, implements the post-protection accelerated in-place feeder automation fault handling method as described above.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the post-protection accelerated in-place feeder automation fault handling method as described above.
The embodiment of the invention has the beneficial effects that:
the invention provides a post-protection accelerated in-situ feeder automatic fault processing method and a post-protection accelerated in-situ feeder automatic fault processing system, which can solve the problems that the traditional relay protection technology in the existing power distribution network fault isolation technology loses selectivity, in-situ feeder automatic fault isolation and power restoration are carried out, or the construction cost is increased by depending on communication or the time consumption of communication is not depended on, provide timely fault isolation and power restoration for transformer substation equipment, and ensure the safe use of the transformer substation equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a method for accelerated in-situ feeder automation fault handling after protection in accordance with the present invention;
FIG. 2 is a schematic diagram of the transient fault isolation and power restoration process of the present invention;
FIG. 3 is a schematic diagram of the permanent fault isolation and power restoration process according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
Referring to fig. 1, a first embodiment of the present invention provides a method for accelerated post-protection in-place feeder automation fault handling, including:
when a fault of a power distribution network line is detected, the outgoing line protection device of the transformer substation performs tripping, and the distribution feeder terminal performs voltage loss brake separation.
After the fault is confirmed to be removed, the substation outgoing line protection device executes reclosing, and the distribution feeder terminal executes incoming call closing.
And after the distribution feeder terminal is switched on, performing accelerated detection after protection within Y time delay.
In combination with the first aspect, the embodiments of the present invention provide a first possible implementation manner of the first aspect, wherein,
when detecting that distribution network line breaks down, the tripping operation is carried out to the protection device that is qualified for the next round of competitions of transformer substation, and the decompression separating brake is carried out to distribution feeder terminal, includes:
if the feeder terminal detects the fault for the first time, the switch tripping is not executed.
And if each feeder line terminal on the distribution network line detects that the two sides are in voltage loss, executing switch tripping.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where after the fault is determined to be removed, the substation outgoing line protection device performs reclosing, and the distribution feeder terminal performs incoming call closing, including:
if the current switch on the power distribution network line is positioned in the branch position, and the feeder line terminal detects that any side has pressure, and the time is more than or equal to X delay, the current switch is superposed.
And if the current switch on the power distribution network line is positioned in the branch position and the feeder line terminal detects that any side has pressure and the time is less than X delay, memorizing the reverse incoming call locking and not executing the superposition of the current switch.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where after the distribution feeder terminal is switched on, performing accelerated detection after protection within a Y delay includes:
after the switch is switched on, if the Y delay inner feeder terminal detects a fault, the switch is switched off in an accelerated mode after protection.
After the switch is switched on, if the Y delay inner feeder terminal does not detect the fault, the memory is locked for protection and then accelerated, and the memory is used for acceleration after the fault is detected again and the protection is not executed.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where a time X set by a substation outgoing line reclosing delay time is shorter than a time Y set by a feeder terminal fault protection delay time.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the post-protection acceleration includes overcurrent acceleration, zero-current acceleration, and zero-voltage acceleration, which are protection functions capable of correctly identifying an inter-phase short circuit and a ground fault.
The process of isolating and recovering power supply aiming at transient faults is shown in fig. 2, wherein CB1 and CB2 are outgoing line switches of a transformer substation 1 and a transformer substation 2 respectively, and the switch type is a circuit breaker; f001, F002, F003, F101 and F102 are section switches, and the switch type is a circuit breaker; l1 is a tie switch, and the switch type is a breaker; the closing delays of the F001, the F002, the F003, the F101 and the F102 are all X, the acceleration delays after the locking protection are all Y, and Y is smaller than X; the power-losing switching-off delay of F001, F002, F003, F101 and F102 is Z, and Z is less than the reclosing time of CB 1; the acceleration delay after the protection of F001, F002, F003, F101 and F102 is less than the delay of the protection action of CB 1; and the delay S of the L1 on-off interconnection switch is greater than (CB1 reclosing time + 3X).
In Step1, when the distribution network line normally runs, CB1, CB2, F001, F002, F003, F101 and F102 are all in a closed state, and connection L1 is in an open state.
In Step2, transient faults occur between sections F002 and F003, the CB1, the F001 and the F002 all feel the faults at the time, the CB1 is tripped out by the protection of the outgoing line 1 of the transformer substation in a delayed mode, after the voltage loss of the two sides is detected, the switches of the F001, the F002 and the F003 are tripped out after the Z delay, and the transient faults are cut off at the time; f101 and F102 keep the closing state, and the communication L1 detects that one side is not pressed, starts S delay timing and prepares to close.
In Step3, after the CB1 confirms that the switch is tripped, the switch is switched on through reclosing delay CB1, at the moment, one side of F001 feels pressure, and the switch is switched on through X delay, so that F001 is switched on, and similarly, the power supply recovery of a non-fault area is finished when the same switching-on logic as that of F001 is executed by F002 and F003; when the contact L1 detects that the two sides have pressure, the S delay timing is stopped, and the opening state is kept.
Through the action processes of Step2 and Step3, the power distribution network system completes the removal of the transient fault and the restoration of power supply.
The invention aims at the permanent fault isolation and power supply recovery processes, as shown in fig. 3, CB1 and CB2 are respectively outgoing line switches of a transformer substation 1 and a transformer substation 2, and the switch type is a breaker; f001, F002, F003, F101 and F102 are section switches, and the switch type is a circuit breaker; l1 is a tie switch, and the switch type is a breaker; the closing delays of the F001, the F002, the F003, the F101 and the F102 are all X, the acceleration delays after the locking protection are all Y, and Y is smaller than X; the power-losing switching-off delay of F001, F002, F003, F101 and F102 is Z, and Z is less than the reclosing time of CB 1; the acceleration delay after the protection of F001, F002, F003, F101 and F102 is less than the delay of the protection action of CB 1; and the delay S of the L1 on-off interconnection switch is greater than (CB1 reclosing time + 3X).
In Step1, when the distribution network line normally runs, CB1, CB2, F001, F002, F003, F101 and F102 are all in a closed state, and connection L1 is in an open state.
In Step2, a permanent fault occurs between the sections F002 and F003, the CB1, the F001 and the F002 all feel the fault at the moment, the CB1 is tripped out by the protection of the outgoing line 1 of the transformer substation in a delayed way, the F001, the F002 and the F003 trip out respective switches after Z delay after the voltage loss of the two sides is detected, and the isolation of a fault area is primarily completed at the moment; f101 and F102 keep the closing state, and the communication L1 detects that one side is not pressed, starts S delay timing and prepares to close.
In Step3, after the CB1 confirms that the switch is tripped, the switch is switched on through reclosing delay CB1, at the moment, pressure is sensed on one side F001, and the switch is switched on through X delay; f002 side is pressed after F001 is switched on, and F002 is switched on after X time delay; f101 and F102 are kept in a closing state, and the communication L1 continues S delay timing to prepare for closing.
In Step4, after F002 is switched on, both F001 and F002 detect faults, but the time after the F001 switch is switched on exceeds Y delay, so that the F001 feeder terminal performs acceleration after locking protection, and the F001 switch keeps a switching-on state; when the F002 feeder terminal detects a fault and the time of the F002 switch after closing is less than Y delay, the F002 switch is tripped by the accelerated action after protection, and the reverse incoming call locking is memorized; f101 and F102 are kept in a closing state, and the communication L1 continues S delay timing to prepare for closing.
In Step5, after S delay, the communication L1 closes the L1 switch, and power supply to the non-fault area between L1 and F003 is recovered; at the moment, the feeder line terminal at the F003 does not execute the incoming call closing logic due to the fact that the incoming call is locked in a reverse direction by memory; a fault region between F002 and F003 is achieved.
Through the action processes of Step2, Step3, Step4 and Step5, the power distribution network system completes isolation of the permanent fault area between F002 and F003 and restoration of power supply of the non-fault area between L1 and F003.
A second embodiment of the present invention provides a post-protection accelerated in-place feeder automation fault handling system, comprising:
the transformer substation outgoing line protection module is used for tripping the transformer substation outgoing line protection device when detecting that a power distribution network line has a fault, and switching off under a loss of voltage at a power distribution feeder terminal;
the transformer substation outgoing line reclosing module is used for confirming that after the fault is removed, the transformer substation outgoing line protection device executes reclosing, the power distribution feeder terminal executes incoming call closing, if the current switch on the power distribution network line is positioned at a separating position and the feeder terminal detects that any side has pressure, and the time is more than or equal to X delay, the current switch is reclosed, and if the current switch on the power distribution network line is positioned at a separating position and the feeder terminal detects that any side has pressure and the time is less than X delay, reverse incoming call locking is memorized and the current switch is not reclosed;
and the feeder terminal fault protection module is used for performing accelerated detection after Y-delay internal protection after the power distribution feeder terminal is switched on, switching off the switch after protection if the Y-delay internal feeder terminal detects a fault after the switch is switched on, and accelerating after memory locking protection if the Y-delay internal feeder terminal does not detect a fault after the switch is switched on, and accelerating after the Y-delay internal feeder terminal detects no protection after the fault is detected again.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor, when executing the computer program, implements the post-protection accelerated in-place feeder automation fault handling method as described above.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the post-protection accelerated in-place feeder automation fault handling method as described above.
The embodiment of the invention aims to protect a post-protection accelerated in-situ feeder automation fault processing method and a post-protection accelerated in-situ feeder automation fault processing system, and has the following effects:
the invention can solve the problems that the traditional relay protection technology in the existing power distribution network fault isolation technology loses selectivity, the in-situ feeder automatic fault isolation and power restoration are carried out, the construction cost is increased by depending on communication or the communication unit time consumption is not depended on, the timely fault isolation and power restoration are provided for the transformer substation equipment, and the safe use of the transformer substation equipment is ensured.
The computer program product of the method and the apparatus for accelerating automatic fault handling of an in-place feeder after protection provided by the embodiments of the present invention includes a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method in the foregoing method embodiments, and specific implementations may refer to the method embodiments and are not described herein again.
Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, and the like, and when a computer program on the storage medium is run, the method for accelerating the in-situ feeder automation fault processing after protection can be executed, so that the method can provide timely fault isolation and power restoration for the substation equipment, and ensure the safe use of the substation equipment.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A post-protection accelerated in-situ feeder automation fault handling method is characterized by comprising the following steps:
when a fault of a power distribution network line is detected, the transformer substation outgoing line protection device performs tripping, and the distribution feeder line terminal performs voltage loss brake separation;
after the fault is confirmed to be removed, the substation outgoing line protection device executes reclosing, and the distribution feeder terminal executes incoming call closing;
and after the distribution feeder terminal is switched on, performing accelerated detection after protection within Y time delay.
2. The post-protection accelerated in-place feeder automation fault handling method according to claim 1, wherein when a fault is detected in a distribution network line, a substation outlet protection device performs tripping, and a distribution feeder terminal performs voltage-loss tripping, comprising:
if the feeder line terminal detects the fault for the first time, the switch tripping is not executed;
and if each feeder line terminal on the distribution network line detects that the two sides are in voltage loss, executing switch tripping.
3. The post-protection accelerated in-situ feeder automation fault handling method of claim 1, wherein after the confirmed fault is removed, a substation outgoing line protection device performs reclosing, and a distribution feeder terminal performs incoming call closing, comprising:
if the current switch on the power distribution network line is positioned separately, and the feeder line terminal detects that any side has pressure, and the time is more than or equal to X delay, then the current switch is superposed;
and if the current switch on the power distribution network line is positioned in the branch position and the feeder line terminal detects that any side has pressure and the time is less than X delay, memorizing the reverse incoming call locking and not executing the superposition of the current switch.
4. The post-protection accelerated in-place feeder automation fault handling method of claim 3, wherein performing post-protection accelerated detection within a Y-delay after the distribution feeder terminal is switched on comprises:
after the switch is switched on, if the Y delay inner feeder terminal detects a fault, the switch is switched off in an accelerated manner after protection;
after the switch is switched on, if the Y delay inner feeder terminal does not detect the fault, the memory is locked for protection and then accelerated, and the memory is used for acceleration after the fault is detected again and the protection is not executed.
5. The post-protection accelerated in-place feeder automation fault handling method of claim 4,
the time X set by the substation outgoing line reclosing delay is shorter than the time Y set by the feeder terminal fault protection delay.
6. The post-protection acceleration in-place feeder automation fault handling method of claim 4, wherein the post-protection acceleration comprises over-current acceleration, zero-current acceleration, and zero-voltage acceleration.
7. A post-protection accelerated in-place feeder automation fault handling system, comprising:
the transformer substation outgoing line protection module is used for tripping the transformer substation outgoing line protection device when detecting that a power distribution network line has a fault, and switching off under a loss of voltage at a power distribution feeder terminal;
the transformer substation outgoing line reclosing module is used for confirming that after the fault is removed, the transformer substation outgoing line protection device executes reclosing, the power distribution feeder terminal executes incoming call closing, if the current switch on the power distribution network line is positioned at a separating position and the feeder terminal detects that any side has pressure, and the time is more than or equal to X delay, the current switch is reclosed, and if the current switch on the power distribution network line is positioned at a separating position and the feeder terminal detects that any side has pressure and the time is less than X delay, reverse incoming call locking is memorized and the current switch is not reclosed;
and the feeder terminal fault protection module is used for performing accelerated detection after Y-delay internal protection after the power distribution feeder terminal is switched on, switching off the switch after protection if the Y-delay internal feeder terminal detects a fault after the switch is switched on, and accelerating after memory locking protection if the Y-delay internal feeder terminal does not detect a fault after the switch is switched on, and accelerating after the Y-delay internal feeder terminal detects no protection after the fault is detected again.
8. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the post-protection accelerated in-place feeder automation fault handling method of any one of claims 1 to 6.
9. A computer-readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the post-protection accelerated in-place feeder automation fault handling method of any of claims 1 to 6.
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