CN114362374A - Method and system for preventing contact switch from being switched on after active load shedding of distribution network - Google Patents
Method and system for preventing contact switch from being switched on after active load shedding of distribution network Download PDFInfo
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- CN114362374A CN114362374A CN202210255580.3A CN202210255580A CN114362374A CN 114362374 A CN114362374 A CN 114362374A CN 202210255580 A CN202210255580 A CN 202210255580A CN 114362374 A CN114362374 A CN 114362374A
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a method and a system for preventing contact switch closing after active load shedding of a distribution network, relating to the technical field of distribution network load shedding, judging whether the current load shedding is active load shedding or not according to automatically acquired bus three-phase voltage, outgoing line switch information, action signals of a safety automatic device and hand-open switch information, and sending a locking instruction to a corresponding self-healing contact switch when the current load shedding is determined to be active load shedding, so that the self-healing contact switch is enabled to be closed to have a delayed closing function, the automatic identification of the active load shedding and the delayed closing function of the automatic locking contact switch are realized, the participation of a dispatcher is not needed, the complete switching is realized, the problem that the contact switch closing after the active load shedding is prevented in the prior art is solved that the contact switch is remotely controlled by the dispatcher to be opened, the workload of the dispatcher is increased, and the dispatcher cannot be ensured not to miss the contact switch, the two grounding systems of the power distribution network run in parallel, the protection sensitivity is reduced, and the technical problem of running risk of the power grid is increased.
Description
Technical Field
The invention relates to the technical field of distribution network load shedding, in particular to a method and a system for preventing a contact switch from being switched on after active load shedding of a distribution network.
Background
The distribution network feeder automation technology can realize the functions of positioning and isolating a fault section and automatically recovering power of a non-fault section, greatly improves the power supply reliability of a distribution network, reduces the power failure time of a user, and reduces the power failure range, thereby being widely popularized and applied.
The voltage time type distribution network automation terminal can realize fault location, isolation and self-healing without depending on a main station through voltage-loss delay switching-off, incoming call delay switching-on and single-side power-loss delay switching-on of the interconnection switch, and has the characteristics of simplicity, high efficiency and easiness in popularization, so that the voltage time type distribution network automation technology is most widely applied. In the existing voltage time type distribution network automation technology, because the interconnection switch only has a unilateral power loss delay switching-on function, and the function locking or function quitting of the voltage loss setting is not caused aiming at the active load shedding, the interconnection switch can not lock the delay switching-on when the load shedding is carried out actively, the power supply can be recovered through the interconnection switch when the load shedding is carried out actively, the' switching-on to the greatest extent can not be realized, and great hidden danger is brought to the safe operation of a distribution network. The existing method is that after the load is actively cut off, the connection switch is disconnected by a dispatcher in a remote control mode, and the connection switch is prevented from being switched on in a delayed mode. Such operation has increased dispatcher's work load on the one hand, and on the other hand can't guarantee that the dispatcher can not miss and cut the contact switch, causes two ground connection systems of distribution network and moves side by side, and protection sensitivity descends, has increased the electric wire netting operation risk.
Disclosure of Invention
The invention provides a method and a system for preventing contact switches from being switched on after active load shedding of a distribution network, which are used for solving the technical problems that the workload of a dispatcher is increased, the dispatcher cannot be guaranteed not to switch on the contact switches in a missed mode, two grounding systems of the distribution network run in parallel, the protection sensitivity is reduced, and the running risk of the power grid is increased in the conventional method for preventing contact switches from being switched on after active load shedding.
In view of this, the first aspect of the present invention provides a method for preventing a tie switch from being switched on after an active load shedding of a distribution network, including:
collecting bus three-phase voltage with preset voltage level, outgoing line switch information, action signals of a safety automatic device and hand-operated switch information through a master station;
judging whether bus voltage loss occurs to a bus with a preset voltage level according to the bus three-phase voltage, if so, triggering a first active load shedding judgment rule, judging whether the bus voltage loss is caused by active load shedding according to an action signal and hand-operated switch-off information of a safety automatic device, if so, judging that the bus voltage loss is caused by active load shedding, and sending a locking instruction to an outgoing line self-healing contact switch connected with the voltage-losing bus so that the outgoing line self-healing contact switch has a closing delay switching-on function;
or judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal of the safety automatic device and the hand opening switch information, and if so, sending a locking instruction to an outgoing self-healing interconnection switch connected with the voltage-loss bus so that the outgoing self-healing interconnection switch closes the delayed closing function.
Optionally, the first active load shedding determination rule is:
the method comprises the steps of obtaining the switch-on state of a first-level power supply link on a voltage-loss bus, judging whether a safety automatic device action signal or a hand-off switch signal exists or not if any switch of the first-level power supply link on the voltage-loss bus is in a switch-off state, and judging that the voltage-loss bus is caused by active load shedding if the switch-on state is judged.
Optionally, the second active load shedding determination rule is:
and judging whether the outgoing switch is in a switching-off state or not by a safety automatic device action signal or a hand-operated switch-off signal, if so, judging that the switching-off of the outgoing switch is caused by active load switching-off.
Optionally, the bus of the preset voltage class is a 10kV bus or a 20kV bus.
Optionally, a topology tracing method is adopted to judge whether bus voltage loss occurs to the bus with the preset voltage level.
The second aspect of the application provides a join in marriage system that net prevented contact switch combined floodgate after initiatively cutting load, includes:
the information acquisition module is used for acquiring bus three-phase voltage with a preset voltage level, outgoing line switch information, an action signal of the safety automatic device and hand-operated switch information through the master station;
the first action module is used for judging whether bus voltage loss occurs to a bus with a preset voltage level according to the bus three-phase voltage, if so, triggering a first active load shedding judgment rule, judging whether the bus voltage loss is caused by active load shedding according to an action signal and hand-operated switch information of the safety automatic device, if so, judging that the bus voltage loss is caused by active load shedding, and sending a locking instruction to an outgoing line self-healing interconnection switch connected with the voltage-losing bus so that the outgoing line self-healing interconnection switch can be closed for delaying switching on;
and the second action module is used for judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal and hand opening and closing information of the safety automatic device, and if so, sending a locking instruction to an outgoing self-healing interconnection switch connected with the voltage-loss bus so that the outgoing self-healing interconnection switch can close the delayed closing function.
Optionally, the first action module is specifically configured to:
whether bus voltage loss occurs to a bus with a preset voltage level is judged according to the bus three-phase voltage, if yes, the switch closing state of a last-stage power supply link of the voltage-loss bus is obtained, if any switch of the last-stage power supply link of the voltage-loss bus is in a switching-off state, whether a safety automatic device action signal or a hand-operated switch signal exists at the moment is judged, if yes, the bus voltage loss is judged to be caused by active load switching, a locking instruction is sent to an outgoing line self-healing contact switch connected with the voltage-loss bus, and the outgoing line self-healing contact switch is enabled to be closed to delay the switching-on function.
Optionally, the second action module is specifically configured to:
and judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, judging whether a safety automatic device action signal or a hand opening switch signal exists when the outgoing switch is in the opening state, if so, judging that the opening of the outgoing switch is caused by active load switching, and sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch can close a delayed closing function.
Optionally, the bus of the preset voltage class is a 10kV bus or a 20kV bus.
Optionally, a topology tracing method is adopted to judge whether bus voltage loss occurs to the bus with the preset voltage level.
According to the technical scheme, the method and the system for preventing the contact switch from being switched on after the active load shedding of the distribution network have the following advantages:
the invention provides a method and a system for preventing contact switch closing after active load shedding of a distribution network, which judge whether the current shedding load is the active shedding load or not according to automatically acquired bus three-phase voltage, outgoing line switch information, action signals of a safety automatic device and hand-opening switch information, and send a locking instruction to a corresponding self-healing contact switch when the active shedding load is confirmed, so that the self-healing contact switch is enabled to close a delayed closing function, the automatic identification of the active shedding load and the delayed closing function of the automatic locking contact switch are realized, the dispatcher does not need to participate, the complete switching is realized, the problem that the existing method for preventing contact switch closing after the active shedding load is to remotely control the contact switch through the dispatcher, the workload of the dispatcher is increased, the dispatcher cannot be ensured not to miss-switch the contact switch, and two grounding systems are caused to run in parallel is solved, the protection sensitivity is reduced, and the technical problem of power grid operation risk is increased.
Meanwhile, the method and the system for preventing the contact switch from being switched on after the active load shedding of the distribution network, which are provided by the invention, can be realized only by modifying the judgment logics of the automatic terminal and the main station, do not need to increase hardware configuration, and are easy to realize.
According to the method and the system for preventing the contact switch from being switched on after active load shedding of the distribution network, only the existing communication relation between the terminal and the main station is needed, the communication relation between the transformer substation and the contact switch automation terminal and the distributed main station are not needed, investment is saved, and maintenance is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for preventing a contact switch from being switched on after active load shedding of a distribution network according to the present invention;
fig. 2 is a logic block diagram of a method for preventing a contact switch from being switched on after an active load shedding of a distribution network, provided by the invention;
fig. 3 is a schematic structural diagram of a system for preventing a tie switch from being switched on after an active load shedding of a distribution network, provided by the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The power dispatching automation system comprises: the system capable of directly providing data acquisition and monitoring service for normal operation of the power grid mainly comprises the following functions: the system has the advantages of multiple functions of real-time database management, data acquisition, information processing, report generation, safety management, historical library management, statistical calculation, historical trend, alarm processing, web browsing, accident recall, event sequence recording, dispatcher simulation training and the like.
The safety automatic device comprises: automatic protection devices for preventing power system from losing stability and avoiding large-area power failure accidents of the power system, such as automatic reclosing device, power system stability control device, automatic power system disconnection device, automatic load reduction device according to frequency (voltage) and the like.
For easy understanding, please refer to fig. 1 and fig. 2, the present invention provides an embodiment of a method for preventing a tie switch from being closed after an active load shedding of a distribution network, including:
It should be noted that the dispatching automation master station, i.e., the power dispatching automation system workstation, collects the three-phase voltage of the bus with the preset voltage class (10 kV or 20 kV), the outgoing line switch information (such as the switch position and state), the action signal of the safety automation device, and the hand-open switch information (such as the switch position and state).
And 103, judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal and hand opening switch information of the safety automatic device, and if so, sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch can be closed to delay the closing function.
It should be noted that, in the present invention, whether load shedding of the power distribution network is active load shedding is judged by two aspects, namely, whether a bus is under voltage and whether an outgoing line switch is opened, and whether the bus is under voltage and whether the outgoing line switch is opened respectively and correspondingly use a first active load shedding judgment rule and a second active load shedding judgment rule. Specifically, when the bus with the preset voltage level is judged to have bus voltage loss according to the bus three-phase voltage, whether all switches of a previous-stage power supply link of the voltage-loss bus are in the switching-on position or not is judged, if all switches of the previous-stage power supply link of the voltage-loss bus are in the switching-on position, the fact that the bus voltage loss is caused by the voltage loss of a previous-stage power supply is indicated, at the moment, the self-healing switch can normally act, and the locking delay switching-on function is not needed. If any switch of the upper-level power supply link of the voltage-loss bus is at the switching-off position, judging whether a safety automatic device action signal or a hand-off signal exists or not, if the safety automatic device action signal or the hand-off signal exists, judging that the bus voltage loss is caused by active load switching, sending a locking instruction to an outgoing line self-healing interconnection switch connected with the bus to enable the interconnection switch to have a locking delay switching-on function, and if the safety automatic device action signal or the hand-off signal does not exist, judging that a superior fault or a switch is tripped illegally, enabling the self-healing switch to normally act, and not needing the locking delay switching-on function. When the outgoing switch is judged to be in a switching-off state according to the outgoing switch information, whether a safety automatic device action signal or a hand-operated switch opening signal exists or not is directly judged, if yes, whether the outgoing switch switching-off is caused by active load switching-off is judged, a locking instruction is sent to a self-healing interconnection switch of a line connected with the outgoing switch, the self-healing interconnection switch is enabled to close a delayed switching-on function, if not, a fault or switch tripping is judged, the self-healing switch can normally act, and the delayed switching-on function does not need to be locked.
In one embodiment, a topology tracking method is adopted to judge whether bus voltage loss or outlet switch opening occurs in buses with preset voltage levels. According to a topology tracking method, whether the bus is in voltage loss or whether the outgoing line switch is in brake-off is judged according to the collected bus three-phase voltage and the outgoing line switch information.
The method for preventing the contact switch from closing after active load shedding of the distribution network provided by the invention judges whether the current shedding load is the active load shedding according to the automatically acquired bus three-phase voltage, the outgoing line switch information, the action signal of a safety automatic device and the hand-opening switch information, and sends a closing instruction to the corresponding self-healing contact switch when the current shedding load is determined to be the active load shedding load, so that the self-healing contact switch is closed and delayed to close, the automatic identification of the active load shedding and the delayed to close function of the automatic closing contact switch are realized, the aim of completely closing is fulfilled without the participation of a dispatcher, the problem that the contact switch is closed after the active load shedding is solved, the workload of the dispatcher is increased, the dispatcher cannot be ensured not to miss the closing of the contact switch, and two grounding systems of the distribution network run in parallel is solved, the protection sensitivity is reduced, and the technical problem of power grid operation risk is increased.
Meanwhile, the method for preventing the distribution network from switching on after active load shedding by contacting with the switch can be realized only by modifying the judgment logics of the automatic terminal and the main station, does not need to increase hardware configuration, and is easy to realize.
According to the method for preventing the contact switch from being switched on after active load shedding of the distribution network, only the existing communication relation between the terminal and the main station is needed, the communication relation between the transformer substation and the contact switch automation terminal and the distributed main station are not needed, investment is saved, and maintenance is facilitated.
For easy understanding, please refer to fig. 2 and fig. 3, the present invention provides an embodiment of a system for preventing a tie switch from closing after an active load shedding of a distribution network, including:
the information acquisition module is used for acquiring bus three-phase voltage with a preset voltage level, outgoing line switch information, an action signal of the safety automatic device and hand-operated switch information through the master station;
the first action module is used for judging whether bus voltage loss occurs to a bus with a preset voltage level according to the bus three-phase voltage, if so, triggering a first active load shedding judgment rule, judging whether the bus voltage loss is caused by active load shedding according to an action signal and hand-operated switch information of the safety automatic device, if so, judging that the bus voltage loss is caused by active load shedding, and sending a locking instruction to an outgoing line self-healing interconnection switch connected with the voltage-losing bus so that the outgoing line self-healing interconnection switch can be closed for delaying switching on;
and the second action module is used for judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal and hand opening and closing information of the safety automatic device, and if so, sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch closes a delayed closing function.
The first action module is specifically configured to:
whether bus voltage loss occurs to a bus with a preset voltage level is judged according to the bus three-phase voltage, if yes, the switch closing state of a last-stage power supply link of the voltage-loss bus is obtained, if any switch of the last-stage power supply link of the voltage-loss bus is in a switching-off state, whether a safety automatic device action signal or a hand-operated switch signal exists at the moment is judged, if yes, the bus voltage loss is judged to be caused by active load switching, a locking instruction is sent to an outgoing line self-healing contact switch connected with the voltage-loss bus, and the outgoing line self-healing contact switch is enabled to be closed to delay the switching-on function.
The second action module is specifically configured to:
and judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, judging whether a safety automatic device action signal or a hand opening switch signal exists when the outgoing switch is in the opening state, if so, judging that the opening of the outgoing switch is caused by active load switching, and sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch can close a delayed closing function.
The bus with the preset voltage level is a 10kV bus or a 20kV bus.
And judging whether the bus with the preset voltage level has bus voltage loss by adopting a topology tracking method.
The system for preventing the contact switch from closing after active load shedding of the distribution network, provided by the invention, judges whether the current shedding load is the active load shedding according to the automatically acquired bus three-phase voltage, the outgoing line switch information, the action signal of a safety automatic device and the hand-opening switch information, and sends a locking instruction to the corresponding self-healing contact switch when the current shedding load is determined to be the active load shedding load, so that the self-healing contact switch is enabled to close the delayed closing function, the automatic identification of the active load shedding load and the delayed closing function of the automatic locking contact switch are realized, the aim of completely cutting is fulfilled without the participation of a dispatcher, the problem that the contact switch is closed after the active load shedding is solved, the workload of the dispatcher is increased, the dispatcher cannot be ensured not to miss the contact switch, and the two grounding systems of the distribution network run in parallel is solved, the protection sensitivity is reduced, and the technical problem of power grid operation risk is increased.
Meanwhile, the system for preventing the distribution network from contacting the switch to be switched on after the active load shedding is provided by the invention can be realized only by modifying the judgment logics of the automatic terminal and the main station, does not need to increase hardware configuration and is easy to realize.
The system for preventing the contact switch from being switched on after active load shedding of the distribution network, provided by the invention, only needs to use the existing communication relation between the terminal and the main station, does not need to establish the communication relation between the transformer substation and the contact switch automation terminal and a distributed main station, saves investment and is convenient to maintain.
The principle of the system for preventing the contact switch from being switched on after the active load shedding by the distribution network provided by the invention is the same as that of the method for preventing the contact switch from being switched on after the active load shedding by the distribution network in the method for preventing the contact switch from being switched on after the active load shedding by the distribution network, so that the same technical effect can be obtained, and the detailed description is omitted.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for preventing a contact switch from being switched on after active load shedding of a distribution network is characterized by comprising the following steps:
collecting bus three-phase voltage with preset voltage level, outgoing line switch information, action signals of a safety automatic device and hand-operated switch information through a master station;
judging whether bus voltage loss occurs to a bus with a preset voltage level according to the bus three-phase voltage, if so, triggering a first active load shedding judgment rule, judging whether the bus voltage loss is caused by active load shedding according to an action signal and hand-operated switch-off information of a safety automatic device, if so, judging that the bus voltage loss is caused by active load shedding, and sending a locking instruction to an outgoing line self-healing contact switch connected with the voltage-losing bus so that the outgoing line self-healing contact switch has a closing delay switching-on function;
or judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal of the safety automatic device and the hand opening switch information, and if so, sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch can close the delayed closing function.
2. The method for preventing the contact switch from being switched on after the active load shedding of the distribution network according to claim 1, wherein the first active load shedding judgment rule is as follows:
the method comprises the steps of obtaining the switch-on state of a first-level power supply link on a voltage-loss bus, judging whether a safety automatic device action signal or a hand-off switch signal exists or not if any switch of the first-level power supply link on the voltage-loss bus is in a switch-off state, and judging that the voltage-loss bus is caused by active load shedding if the switch-on state is judged.
3. The method for preventing the closing of the interconnection switch after the active load shedding of the distribution network according to claim 1 or 2, wherein the second active load shedding judgment rule is as follows:
and judging whether the outgoing switch is in a switching-off state or not by a safety automatic device action signal or a hand-operated switch-off signal, if so, judging that the switching-off of the outgoing switch is caused by active load switching-off.
4. The method for preventing closing of a tie switch after active load shedding of a distribution network according to claim 1, wherein a bus with a preset voltage level is a 10kV bus or a 20kV bus.
5. The method for preventing the contact switch from being switched on after the active load shedding of the distribution network according to claim 1, wherein a topology tracking method is adopted to judge whether the bus with a preset voltage level has bus voltage loss.
6. The utility model provides a join in marriage system that net prevented contact switch combined floodgate after initiatively cutting load which characterized in that includes:
the information acquisition module is used for acquiring bus three-phase voltage with a preset voltage level, outgoing line switch information, an action signal of the safety automatic device and hand-operated switch information through the master station;
the first action module is used for judging whether bus voltage loss occurs to a bus with a preset voltage level according to the bus three-phase voltage, if so, triggering a first active load shedding judgment rule, judging whether the bus voltage loss is caused by active load shedding according to an action signal and hand-operated switch information of the safety automatic device, if so, judging that the bus voltage loss is caused by active load shedding, and sending a locking instruction to an outgoing line self-healing interconnection switch connected with the voltage-losing bus so that the outgoing line self-healing interconnection switch can be closed for delaying switching on;
and the second action module is used for judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, triggering a second active load switching judgment rule, judging whether the outgoing switch is caused by active load switching according to an action signal and hand opening and closing information of the safety automatic device, and if so, sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch closes a delayed closing function.
7. The system for preventing the contact switch from being switched on after the active load shedding is performed on the distribution network according to claim 6, wherein the first action module is specifically configured to:
whether bus voltage loss occurs to a bus with a preset voltage level is judged according to the bus three-phase voltage, if yes, the switch closing state of a last-stage power supply link of the voltage-loss bus is obtained, if any switch of the last-stage power supply link of the voltage-loss bus is in a switching-off state, whether a safety automatic device action signal or a hand-operated switch signal exists at the moment is judged, if yes, the bus voltage loss is judged to be caused by active load switching, a locking instruction is sent to an outgoing line self-healing contact switch connected with the voltage-loss bus, and the outgoing line self-healing contact switch is enabled to be closed to delay the switching-on function.
8. The system for preventing the contact switch from being switched on after the active load shedding is performed on the distribution network according to claim 6 or 7, wherein the second action module is specifically configured to:
and judging whether the outgoing switch is changed from a closing state to an opening state according to the outgoing switch information, if so, judging whether a safety automatic device action signal or a hand opening switch signal exists when the outgoing switch is in the opening state, if so, judging that the opening of the outgoing switch is caused by active load switching, and sending a locking instruction to a self-healing interconnection switch of a line connected with the outgoing switch so that the self-healing interconnection switch can close a delayed closing function.
9. The system for preventing closing of a tie switch after active load shedding of a distribution network according to claim 6, wherein the bus with the preset voltage level is a 10kV bus or a 20kV bus.
10. The system for preventing the contact switch from being switched on after the active load shedding of the distribution network is carried out according to claim 6, wherein a topology tracking method is adopted to judge whether the bus voltage of the bus with the preset voltage level is lost.
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