CN113258545B - In-situ feeder automation method and system based on multi-stage time step difference protection - Google Patents
In-situ feeder automation method and system based on multi-stage time step difference protection Download PDFInfo
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- CN113258545B CN113258545B CN202110402453.7A CN202110402453A CN113258545B CN 113258545 B CN113258545 B CN 113258545B CN 202110402453 A CN202110402453 A CN 202110402453A CN 113258545 B CN113258545 B CN 113258545B
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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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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention discloses a local feeder automation method and a local feeder automation system based on multi-stage time step difference protection, wherein the method comprises the following steps: setting a level difference protection time delay for each section switch on the line, and when a fault occurs, opening the section switch of the section where the fault signal is detected according to the protection time delay; reclosing the opened section switch according to the set reclosing time delay, and locking quick-break protection after the upstream section switch of the opened section switch confirms that no fault exists after Y time of reclosing; if the fault is superposed when the section switch which is already opened is reclosed, then the section switch is accelerated and protected and then the section switch is closed; if the fault does not occur when the switched-off section switch is reclosed, the switching-on is not carried out, the next-stage section switch is electrified to delay the switching-on and is reclosed in the fault, and then the switching-on is locked after the switching-off is accelerated and protected. The invention greatly reduces the power failure area of the upstream non-fault area of the fault point, thereby reducing the tripping times.
Description
Technical Field
The invention relates to a feeder automation method of a power system, in particular to an in-situ feeder automation method and system based on multi-stage time step difference protection.
Background
With the development of urbanization and the promotion of new rural electrification, urban and rural power distribution networks gradually show the characteristics of various distribution lines, complex network structures and high network failure rate. In order to accelerate the processing speed of the faults of the power distribution network and improve the power supply reliability, feeder automation with the fault self-healing function is more and more put into use. The feeder automation can be divided into two types in the large aspect, namely a centralized type and an in-place type, wherein the in-place type can be deployed quickly without a master station system, and therefore the in-place type feeder automation is preferentially adopted when the distribution automation construction is deployed. At present, various in-situ feeder automation technologies exist at home and abroad, including in-situ superposition feeder automation which does not depend on communication, such as voltage time type, voltage current type, self-adaptive synthesis type, distributed feeder automation which depends on communication and the like, the distributed feeder automation has higher requirements on fault information transmission although fault processing is controlled at the second level, and the reliability and the construction cost of a communication channel restrict the popularization and the application of the mode no matter based on an optical fiber network or a wireless network. The in-situ reclosing feeder automation is widely applied to urban and rural power grids without depending on communication.
The in-situ reclosing type feeder automation can realize the section positioning and isolation of phase-to-phase faults and earth faults, and a certain research result is achieved in the aspects of fixed value self-adaptive setting and accurate positioning. However, the in-situ reclosing type feeder automation relies on the sequential reclosing of the section switches to have the following two problems: (1) When the fault is processed, the switching-on and switching-off times of the upstream switch of the fault point are more, and the power failure of the upstream non-fault area of the fault point is short. (2) The X time limit and the Y time limit are 7s/5s, and the fault processing time is longer. If the upstream section switch closest to the fault point is in trip protection and other section switches upstream of the fault point are not in trip when a fault occurs, short power failure in a non-fault area upstream of the fault point can be well avoided, and the switching-on and switching-off times of partial section switches are reduced. Therefore, there is a need to develop a new feeder automation method and system for power distribution network to solve the above problems and reduce the power outage interval and range, thereby improving the reliability of power supply.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an in-situ feeder automation method based on multi-stage time difference protection, which can reduce the power failure area of a non-fault area at the upstream of a fault point in a larger range, reduce the trip times, quickly isolate and remove faults and improve the reliability of power supply.
The invention also provides an in-situ feeder automation system based on the multi-stage time step difference protection.
According to the first aspect of the invention, the local feeder automation method based on multi-stage time step difference protection comprises the following steps: setting a level difference protection time delay for each section switch on the line, and when a fault occurs, opening the section switch of the section where the fault signal is detected according to the protection time delay; reclosing the opened section switch according to the set reclosing time delay, and locking quick-break protection after the upstream section switch of the opened section switch confirms that no fault exists after Y time of reclosing; if the fault is superposed when the section switch which is already opened is reclosed, then the section switch is accelerated and protected and then the section switch is closed; if the fault does not occur when the switched-off section switch is reclosed, the switching-on is not carried out, the next-stage section switch is electrified to delay the switching-on and is reclosed in the fault, and then the switching-on is locked after the acceleration protection.
According to some embodiments of the invention, the method further comprises: the method for fault detection specifically comprises the following steps: for an interphase short-circuit fault, based on a set interphase overcurrent setting value, each section switch detects interphase overcurrent and combines a time level difference, a first opening with a small time limit value is defined, and a section where a fault point is located is positioned; or for single-phase earth faults, a transient zero-mode line selection or zero-sequence overcurrent protection function is put into use, a line where a fault point is located is selected by a transient zero-mode line selection method or zero-sequence overcurrent is detected, and a section where the fault point is located by combining time level difference.
According to some embodiments of the invention, the method further comprises: performing line configuration, including: installing circuit breaker equipment at each section of the feeder line; or a main line is provided with a breaker, and a branch or tail line is provided with a load switch.
According to some embodiments of the invention, the method further comprises: after the line has an interphase short circuit fault, if the fault point is a transient fault, the upstream switch has a reclosing function, the upstream switch has no fault after being reclosed, and the downstream switch sequentially receives an electric closing to restore power supply; if the fault point is a permanent fault, the upstream switch is coincided to the fault after being coincided, the forward closing is locked after the rear acceleration protection tripping operation, and the downstream switch responds to the short residual voltage of the fault section and locks the reverse closing when the downstream line is restored to supply power.
According to some embodiments of the invention, the method further comprises: after a single-phase earth fault occurs to a line, determining whether to block and switch on or not by detecting whether zero voltage exists in Y time or not after each section switch is switched on; if zero voltage exists after the switch is closed, the switch is opened and closed, otherwise, the switch is not closed.
According to some embodiments of the invention, the method further comprises: for a mode in which a line is configured to install a breaker on a main line, and a branch or end line is installed with a load switch, a line switch downstream of the breaker, which is set to 0 second in time, is configured as a load switch having a feeder protection function of a voltage-time type or a voltage-current-time type or an adaptive type.
According to some embodiments of the present invention, if a section of the section load switch is failed, the circuit breaker with the upstream time set to 0 second performs fault removal and isolation based on voltage-time type or voltage current-time type or adaptive comprehensive type logic by 2 reclosings in cooperation with each section load switch downstream.
According to some embodiments of the invention, the method further comprises: when the override trip occurs, the section switch of the current stage of the fault point is superposed after X time limit delay after the power supply side is electrified, and if fault information is detected within Y time limit after the switch-on, the switch-off is carried out and the forward switch-on is locked; and the next stage of section switch detects residual voltage within X time limit, keeps opening and locks reverse closing.
According to some embodiments of the invention, the method further comprises: after the fault point is cut off, the power supply is switched on by the interconnection point switch, and the line power supply of the non-fault section is recovered after the section switches are switched on by the incoming power supply.
An in-situ feeder automation system based on multi-stage time step difference protection according to a second aspect embodiment of the present invention comprises: a primary switch with rapid on-off capability; the secondary terminal equipment has the functions of multi-stage time difference, post acceleration protection and voltage-time type local feeder automation; the primary switch and the secondary terminal device are adapted to perform the method according to any of the embodiments of the first aspect of the invention.
The embodiment of the invention has the following beneficial effects: the invention breaks through the bottleneck that the traditional feeder switch has poor consistency of breaking capacity and can not realize multi-stage difference matching, combines with a closing quick-break feeder automation mode, and provides a new local feeder automation method realized based on the multi-stage difference protection and the traditional feeder protection. The feeder protection of multistage time difference can be realized by utilizing the high-reliability rapid opening and closing characteristics of the magnetic control switch, the power failure area of the upstream non-fault area of the fault point is reduced to a large extent, and then the tripping times are reduced. Meanwhile, considering that the problem of override tripping possibly exists when multistage time step difference is matched with each sectional switch, each sectional switch has voltage-time type protection logic after being switched off after voltage loss, the incoming call is switched on after a fault, the switching-off is accelerated and protected and the reclosing is locked, and a downstream switch of a fault section detects that the residual voltage of a line is locked and the switching-off can still completely isolate the fault section. Thus, even if there is a step-by-step trip problem, the fault section can be correctly isolated without enlarging the fault section. Moreover, the method solves the problem of difficult fault location of multiple sections of a long line, obviously shortens the automatic protection time of the in-situ feeder, further shortens the fault processing and isolating time, and has higher practicability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a line configuration and a time level difference configuration according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of fault zone isolation according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of fault zone isolation according to a first embodiment of the present invention.
FIG. 4 is a schematic diagram of fault zone isolation according to a second embodiment of the present invention.
Fig. 5 is a schematic diagram of fault zone isolation according to a third embodiment of the present invention.
Fig. 6 is a schematic flow chart of a fault isolation method according to an embodiment of 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, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiment of the invention provides a novel local feeder automation method based on multistage time step difference protection and voltage-time logic coordination, aiming at the problems that a local reclosing type feeder automation model is complex in fixed value setting, more in switching-on and switching-off times and short power failure exists in a non-fault area at the upstream of a fault point in a multi-section multi-connection network. Although the embodiments of the present invention only describe the method of coordinating voltage-time type logic based on multi-stage time difference protection, it is within the scope of the present invention to employ the local feeder automation mode such as time difference and voltage-current-time type or adaptive synthesis type.
The equipment of the system of the embodiment of the invention adopts a primary switch with quick switching-on and switching-off capability and secondary terminal equipment with multistage time difference, post acceleration protection, voltage-time type and other local feeder automation functions. Wherein X and Y time reference engineering in the voltage-time type function applies constant value setting.
According to the embodiment of the invention, the feeder protection of multi-stage time difference is realized through the high-reliability rapid opening and closing characteristic of the magnetic control switch, the power failure area of the upstream non-fault area of the fault point is reduced to a large extent, and the tripping frequency is further reduced.
Referring to fig. 2, after a fault occurs in a line, an upstream switch Ku in a fault section detects that the fault is delayed and then is switched off, and a downstream switch is switched off due to the fact that the upstream switch is switched off and the line is subjected to voltage loss. If the fault point is a transient fault, the Ku is not in fault after superposition, and the downstream switch is sequentially switched on to recover power supply; if the fault point is a permanent fault, the Ku is closed after superposition to the fault and is locked and closed after tripping by the rear acceleration protection, and the Kd is locked and closed when the power supply of the opposite side line is recovered due to the detection of short-time residual voltage of the fault section, so that the fault section is cut off and isolated.
Referring to fig. 1, when a line fails, each switch of the feeder line detects the failure and locates the section where the failure point is located in combination with the time step difference. As shown in fig. 1, since the action delay requirement of the outgoing line switch CB1 is not more than 0.3s, and the step difference is not less than 50ms, the step number is configured to 5, and the protection delay is set for each of the section switches according to the sequence of the section switches, BRK1 is 0.2s, BRK2 is 0.15s, BRK3 is 0.1s, BRK4 is 0.05s, and BRK5 is 0s. Taking fig. 1 as an example, when a fault occurs between BRK4 and BRK5, since the protection delay time of BRK4 is 0.05s, BRK4 is tripped after 0.05s of the fault occurrence, so that the fault point is located between BRK4 and BRK 5.
Particularly, the embodiment of the invention detects the line fault by setting an interphase overcurrent setting value and putting in a transient zero-mode line selection or zero-sequence overcurrent protection function. If the line has an interphase short circuit fault, each section switch of the feeder line detects interphase overcurrent and combines with time level difference, and when the time limit value is small, the section where the fault point is located is firstly switched off; if the line has single-phase earth fault, the fault detection method of each section switch of the feeder line adopts a transient zero-mode line selection method to select the line where the fault is located or detect zero-sequence overcurrent, and then the section where the fault point is located is positioned by matching with time level difference.
The fault removing and isolating method provided by the embodiment of the invention is suitable for different circuit configuration modes, and comprises the steps of installing circuit breaker complete equipment with quick switching-on and switching-off capacity at each subsection (full circuit breaker subsection mode), or only installing a circuit breaker on a main line, and installing a load switch on a branch or tail end line (circuit breaker and load switch subsection mode). When the line configuration mode is the full-circuit breaker section mode, the fault section is determined by setting the time level difference, and the switch at the current level of the fault point is reclosed and locked after being opened, so that fault removal and isolation are realized.
In practical situations, for some reasons, the current-stage switch after a fault occurs is not successfully and rapidly switched off, so that the previous-stage switch is tripped out in a stepped manner, each sectional switch has voltage-time type protection logic after being switched off after voltage loss, incoming call switching-on is switched on after the fault, the protection switching-off is accelerated and the reclosing is locked, and the next-stage switch in a fault section can still completely isolate the fault section when detecting that the line residual voltage is locked and switched off. In this embodiment, for the override trip problem, the post-acceleration protection switching-off function is put into operation on the upstream switch of the current stage, so as to avoid expanding the fault section.
Particularly, if a single-phase earth fault occurs to the line, the upstream switch Ku of the fault section is switched off after detecting the fault delay, and the downstream switch is switched off due to the voltage loss of the line caused by the switching off of the upstream switch. After each section switch is switched on (including superposition and incoming call switching on), whether the section switch is switched on or not is selected by detecting whether zero voltage exists in Y time, if the section switch is switched on, the section switch is switched off and switched on in a locking way, and if the section switch is switched on, the section switch is not switched on in a locking way.
Referring to fig. 1, in some embodiments, since there are many long feeder line segments and setting time step difference numbers and there are long branch lines, the action delay of the outgoing switch at this time cannot exceed 3s, and the step difference is not smaller than 50ms, so the number of steps is at most 5, and the full breaker segment mode cannot be used for the line. The line configuration mode is therefore a circuit breaker and load switch sectionalisation mode. A fast breaker downstream line switch with a time setting of 0 seconds is configured as a load switch with a voltage-time type feeder protection function. If the sectional load switches have faults, the circuit breaker with the upstream time set to be 0 second adopts voltage-time type logic to realize local removal and isolation of the faults by matching 2 reclosures with each of the downstream sectional load switches. The load switch can also be configured to have a voltage-current time type feeder protection function or an adaptive comprehensive type feeder protection function.
After the fault point is cut off, the power supply is switched on by the interconnection point switch, and the line power supply of the non-fault section is recovered after the section switches are switched on by the incoming power supply.
The invention will be further explained by taking the magnetic pole switch complete set as an example in combination with the attached drawings.
Fig. 1 is a schematic diagram of a feeder line system, where the requirement of the action delay of a substation outlet breaker is set to be not more than 0.3s, and a level difference protection delay can be obtained by taking a level difference of 5 as an example:
CB1:t＝0.3s；BRK1:t＝0.2s；BRK2:t＝0.15s；BRK3:t＝0.1s；BRK4:t＝0.05s；BRK5:t＝0s；
setting the X time to be 5s and the Y time to be 3S by all the switch controllers;
the case takes an interphase short circuit fault as an example, the non-voltage automatic switching-off time is 50ms, and the voltage time type reclosing delay time value is 100ms.
The first situation is as follows: referring to fig. 3, the fault is located at the circuit breaker sectional point, and each circuit breaker and the load switch work normally to isolate the fault correctly.
BRK5 has no fault signal, BRK 1-BRK 4 receive the fault signal, configure BRK4 to act first according to the level difference, the action time delay is 50ms, and reclose in the trouble 100ms after separating brake, accelerate the tripping operation after detecting the fault current, and lock, finish the fault isolation finally. In this embodiment, because the BRK4 of the current stage circuit breaker in the fault section is tripped by a quick break successfully, the circuit breaker is reclosed according to the set reclosing delay, and the upstream circuit breaker is locked for quick break protection after confirming that no fault occurs after Y time of reclosing, thereby completing fault isolation.
Case two: referring to fig. 4, the fault is located at the circuit breaker sectional point, and BRK3 trips beyond BRK4, and can still correctly cut off and isolate the fault section.
BRK5 has no fault signal, BRK 1-BRK 4 receive the fault signal, configure BRK4 to act first according to the level difference, but when there is no action for some reason, BRK3 acts, the action time delay is 100ms, BRK4 opens the brake automatically after detecting the no-voltage signal for 50ms, and locks the level difference protection, accelerates the protection after opening; BRK3 recloses 100ms after separating brake, and does not coincide to the trouble, does not carry out the shutting, BRK4 automatic switching-on after the incoming telegram X time, because of coincident in the trouble in the Y time, shutting forward switching-on after the back acceleration separating brake, BKR5 detects that there is the residual voltage on the power supply side, shutting reverse switching-on when the load side incoming telegram. Therefore, fault isolation is finally completed, and the problem that the fault area is expanded cannot be caused even if BRK4 level difference protection does not act under the logic, so that the power supply reliability is improved.
Case three: referring to fig. 5, the fault is located at the sectional point of the load switch, and each breaker and the load switch work normally to isolate the fault correctly.
The BRK 1-BRK 5 receive fault signals, act in a 0ms time delay mode according to configuration BRK5, after BRK5 acts, FS1 and FS2 automatically open a brake after a voltage-free signal is detected for 50ms, BRK5 automatically recloses a brake after the brake is opened for 100ms, FS1 recloses a fault after BRK5 recloses for X time, at the moment, BRK5 detects the fault open brake again, FS1 and FS2 respectively implement forward locking and reverse locking and closing according to signal characteristics when the fault is last time closed, FS1 loses the voltage and opens the brake after BRK5 opens the brake for 50ms, BRK5 recloses for 2 times set after the opening time is repeated, power supply of a non-fault section between BRK5 and FS1 is recovered, FS2 reversely locks after the power supply of a contact switch is switched, the fault section between FS1 and FS2 is isolated, the whole process is finished, and the purpose of isolating the fault area by using a non-breaker type switch is achieved.
Referring to fig. 6, in some embodiments, a fault isolation method includes the steps of: fault detection is carried out, if the section has faults, the switch (the section switch which is the nearest and adjacent to the upstream of the fault point) at the current stage is tripped out quickly; if the quick-break tripping of the switch at the current stage is successful, the downstream switch at the fault point is subjected to voltage loss tripping, the switch at the previous stage is closed and locked for quick break, and the switch at the current stage is overlapped; if the switch of the current stage is superposed to a fault, then the post-acceleration protection tripping is carried out and the switch is closed in a locking way, the fault point is close to the downstream switch to be closed in a locking way, and other switches at the downstream of the fault point are switched to supply power and to be closed in a switching way; if the switch of the current stage is not superposed to a fault, the switch is not locked, and the downstream switch is switched on in a delayed manner when power is supplied.
If the quick-break tripping of the switch at the current stage is unsuccessful, the switch at the previous stage (namely the nearest sectional switch at the upstream of the switch at the current stage) is subjected to quick-break tripping, and the switch at the current stage and the switch at the downstream stage are subjected to voltage loss tripping; then the upper-stage switch is closed and quickly disconnected and then is overlapped; the switch of this stage is switched on in a delayed way when the power is on; if the switch-on of the switch of the current stage is not coincident to a fault, the switch-on is not locked, and the power-on delay switch-on of the downstream switch is carried out; if the switch-on of the switch at the current stage is coincident to a fault, the switch-on is locked after the post-acceleration protection tripping; and then, the fault point is close to the downstream switch to be locked and switched on, and other switches at the downstream of the fault point are switched to supply power and switched on.
The method and the system of the embodiment of the invention can realize the feeder protection of multi-stage time difference by utilizing the high-reliability rapid opening and closing characteristic of the magnetic control switch, reduce the power failure area of the upstream non-fault area of the fault point to a larger extent and further reduce the tripping times. Meanwhile, considering that the problem of override tripping possibly exists when multistage time step difference is matched with each sectional switch, each sectional switch has voltage-time type protection logic after being switched off after voltage loss, the incoming call is switched on after a fault, the switching-off is accelerated and protected and the reclosing is locked, and a downstream switch of a fault section detects that the residual voltage of a line is locked and the switching-off can still completely isolate the fault section. Thus, even if there is a step-by-step trip problem, the fault section can be correctly isolated without enlarging the fault section. In addition, the embodiment of the invention solves the problem of difficult positioning of the multi-section fault of the long line, obviously shortens the automatic protection time of the local feeder, further improves the fault processing time and has high practicability.
Although specific embodiments have been described herein, those of ordinary skill in the art will recognize that many other modifications or alternative embodiments are equally within the scope of this disclosure. For example, any of the functions and/or processing capabilities described in connection with a particular device or component may be performed by any other device or component. In addition, while various illustrative implementations and architectures have been described in accordance with embodiments of the present disclosure, those of ordinary skill in the art will recognize that many other modifications of the illustrative implementations and architectures described herein are also within the scope of the present disclosure.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A method for local feeder automation based on multi-level temporal difference protection, comprising:
setting a level difference protection time delay for each section switch on the line, and when a fault occurs, opening the section switch of the section where the fault signal is detected according to the protection time delay; reclosing the opened section switch according to the set reclosing time delay, and locking quick-break protection after the upstream section switch of the opened section switch confirms that no fault exists after the reclosing time is set;
if the fault is superposed when the section switch which is already opened is reclosed, then the section switch is accelerated and protected and then the section switch is closed;
if the fault is not superposed during reclosing of the section switch which is already opened, the locking is not carried out, the next-stage section switch is electrified to delay the closing and is superposed on the fault, and then the closing is locked after the opening is accelerated and protected;
the method further comprises the following steps: after the interphase short-circuit fault occurs in the line,
if the fault point is a transient fault, the upstream switch has a reclosing function, the upstream switch has no fault after being superposed, and the downstream switch is sequentially powered on to recover power supply;
if the fault point is a permanent fault, the upstream switch is superposed to the fault after superposition, the forward closing is locked after tripping by the rear acceleration protection, and the reverse closing is locked when the downstream switch responds to the short residual voltage of the fault section and recovers power supply of the downstream line.
2. The multi-stage temporal level difference protection based in-situ feeder automation method of claim 1, further comprising: the method for fault detection specifically comprises the following steps:
for the interphase short-circuit fault, based on a set interphase overcurrent setting value, each section switch detects interphase overcurrent and combines with time level difference, and a section where a fault point is located is positioned by first separating brake with a small time limit value; or
And for single-phase earth faults, a transient zero-mode line selection or zero-sequence overcurrent protection function is put into use, a line where a fault point is located is selected by a transient zero-mode line selection method or zero-sequence overcurrent is detected, and a section where the fault point is located is positioned by combining time level difference.
3. The multi-stage temporal level difference protection-based in-situ feeder automation method of claim 1, further comprising: performing line configuration, including:
installing circuit breaker equipment at each subsection of the feeder line; or
A breaker is installed on a main line, and a load switch is installed on a branch line or a tail line.
4. The multi-stage temporal level difference protection based in-situ feeder automation method of claim 1, further comprising: after a single-phase earth fault occurs to a line, determining whether to block and switch on or not by detecting whether zero voltage exists in Y time or not after each section switch is switched on; if zero voltage exists after the switch is closed, the switch is opened and closed, otherwise, the switch is not closed.
5. The multi-stage temporal level difference protection based in-situ feeder automation method of claim 3, further comprising: for a mode in which a line is configured to install a breaker on a main line, and a branch or end line is installed with a load switch, a line switch downstream of the breaker, which is set to 0 second in time, is configured as a load switch having a feeder protection function of a voltage-time type or a voltage-current-time type or an adaptive type.
6. The multi-stage temporal level difference protection based in-situ feeder automation method of claim 5, further comprising: if the subsection load switch section has a fault, the circuit breaker with the upstream time set to be 0 second carries out fault removal and isolation through 2 reclosings and matching with each subsection load switch at the downstream based on voltage-time type or voltage current-time type or self-adaptive comprehensive logic.
7. The multi-stage temporal level difference protection-based in-situ feeder automation method of claim 1, further comprising:
when the override trip occurs, the section switch of the current stage of the fault point is superposed after X time limit delay after the power supply side is electrified, and if fault information is detected within Y time limit after the switch-on, the switch-off is carried out and the forward switch-on is locked; and the next stage of section switch detects residual voltage within X time limit, keeps opening and locks reverse closing.
8. The multi-stage temporal level difference protection-based in-situ feeder automation method of claim 1, further comprising: after the fault point is cut off, the power supply is switched on by the interconnection point switch, and the line power supply of the non-fault section is recovered after the section switches are switched on by the incoming power supply.
9. An in-situ feeder automation system based on multi-level temporal level difference protection, comprising:
a primary switch with rapid on-off capability;
the secondary terminal equipment has the functions of multi-stage time difference, post acceleration protection and voltage-time type local feeder automation;
the primary switch and the secondary terminal device are configured to perform the method of any one of claims 1 to 8.
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| CN202110402453.7A CN113258545B (en) | 2021-04-14 | 2021-04-14 | In-situ feeder automation method and system based on multi-stage time step difference protection |
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| CN113629672B (en) * | 2021-08-30 | 2023-10-10 | 福建省宏科电力科技有限公司 | Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network |
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