CN111668814B - Bus fault removing method and device, computer equipment and storage medium - Google Patents
Bus fault removing method and device, computer equipment and storage medium Download PDFInfo
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- CN111668814B CN111668814B CN202010475219.2A CN202010475219A CN111668814B CN 111668814 B CN111668814 B CN 111668814B CN 202010475219 A CN202010475219 A CN 202010475219A CN 111668814 B CN111668814 B CN 111668814B
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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
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
Abstract
The application relates to a bus fault removing method, a bus fault removing device, computer equipment and a storage medium. According to the embodiment of the application, when the operation mode of the bus is split operation, the spare power automatic switching device is actively locked, so that the condition that when the fault signal of the bus is consistent with the action starting signal of the spare power automatic switching device, the spare power automatic switching device acts and is combined with the fault sub-bus, and unsafe accidents are caused is avoided. The bus fault removing method solves the technical problem that the safety of an existing bus fault removing system is low in the prior art, and achieves the technical effect of improving the safety of the bus fault removing system.
Description
Technical Field
The present application relates to the field of electrical equipment technologies, and in particular, to a method and an apparatus for removing a bus fault, a computer device, and a storage medium.
Background
The bus is a hub for electric energy transmission in the transformer substation, is an extremely important power device in the transformer substation, generally forms a local system with the circuit breaker and the bus protection device, and when the bus breaks down, the bus protection device can rapidly move to cut off each circuit breaker connected with the bus so as to isolate fault points and reduce the shutdown range of the device.
At present, for a bus fault, a standby power supply automatic switching device (referred to as a standby automatic switching device for short) is generally arranged in a transformer substation to act to recover the bus voltage so as to reduce the influence caused by the bus voltage loss. However, when the bus fault meets a certain condition, the spare power automatic switching device can act and be combined with the bus fault, so that the sectional breaker is exploded, and even the safety of the total station power equipment is directly threatened. Therefore, the safety of the current bus fault removal system is low.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a bus fault clearing method, apparatus, computer device and storage medium.
A bus fault removing method is applied to a substation system and comprises the following steps:
determining bus differential current according to current of each interval node of a bus in a transformer substation, wherein the bus differential current is vector sum of current of each interval node of a multi-section main bus;
determining bus voltage drop according to the initial voltage and the working voltage at two ends of the bus, wherein the bus voltage drop is used for representing the voltage drop of the bus;
determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
if the bus fails, determining the operation mode of the bus, wherein the operation mode comprises parallel operation and split operation;
if the operation mode of the buses is parallel operation, controlling bus protection equipment to cut off a circuit breaker connected with a fault primary-secondary line so as to remove the fault of the buses;
and if the operation mode of the bus is split operation, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking a spare power automatic switching device to remove the fault of the bus.
In one embodiment, if the operation mode of the bus is split operation, controlling the bus protection device to cut off a circuit breaker connected to the faulty main bus and lock a backup power automatic switching device to remove the fault of the bus includes:
if the operation mode of the bus is split operation, determining the fault type of the fault, wherein the fault type comprises the following steps: single section bus fault and double section bus fault;
if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus;
and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, if the fault type is a double-section bus fault, controlling the bus protection device to cut off a circuit breaker connected to the faulty main bus and to lock the backup power automatic switching device to remove the fault of the bus includes:
and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary and secondary lines in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, if the operation mode of the bus is parallel operation, controlling the bus protection device to cut off the circuit breaker connected to the failed primary and secondary lines to remove the fault of the bus includes:
if the operation mode of the buses is parallel operation, determining whether the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker;
controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus;
and if the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker, the spare power automatic switching device is not locked.
In one embodiment, the method further comprises the following steps:
and if the bus is in the maintenance state, locking the spare power automatic switching device.
In one embodiment, the backup power automatic switching locking circuit comprises:
a spare power automatic switching device;
one end of the sectional control switch is electrically connected with the negative electrode end of the spare power automatic switching device;
one end of the bus protection equipment is electrically connected with the other end of the sectional control switch;
and the first outlet pressing plate is connected between the positive terminal of the spare power automatic switching device and the other end of the bus protection equipment in series.
In one embodiment, the backup power automatic switching locking circuit comprises:
a spare power automatic switching device;
one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device;
the bus protection equipment is connected in series between the positive terminal of the spare power automatic switching device and the other end of the sectional control switch;
and the second outlet pressing plate is connected with the bus protection equipment in parallel.
A bus bar fault clearing apparatus, the apparatus comprising:
the bus differential current determining module is used for determining bus differential current according to the current of each interval node of a bus in the transformer substation, and the bus differential current refers to the vector sum of the currents of each interval node of a plurality of sections of sub-buses;
the bus voltage drop determining module is used for determining bus voltage drop according to initial voltage and working voltage at two ends of the bus, wherein the bus voltage drop is used for representing the voltage drop of the bus;
the fault bus determining module is used for determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
the operation mode determining module is used for determining the operation mode of the bus if the bus fails, wherein the operation mode comprises parallel operation and split operation;
the first fault removal module is used for controlling the bus protection equipment to cut off a circuit breaker connected with a fault primary-secondary line if the operation mode of the buses is parallel operation so as to remove the fault of the buses;
and the second fault removal module is used for controlling the bus protection equipment to cut off a circuit breaker connected with the fault main bus and lock the spare power automatic switching device if the operation mode of the bus is split operation so as to remove the fault of the bus.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method as described above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as set forth above.
The embodiment of the application provides a bus fault removing method, when a bus breaks down, the operation mode of the bus is judged firstly, a circuit breaker connected with a fault primary-secondary line is cut off, and the spare power automatic switching device is locked to remove the fault of the bus. According to the embodiment of the application, when the operation mode of the bus is split operation, the spare power automatic switching device is actively locked, so that the condition that when the fault signal of the bus is consistent with the action starting signal of the spare power automatic switching device, the spare power automatic switching device acts and is combined with the fault sub-bus, and unsafe accidents are caused is avoided. The bus fault removing method solves the technical problem that an existing bus fault removing system is low in safety in the prior art, and achieves the technical effect of improving safety of the bus fault removing system.
Drawings
FIG. 1 is a diagram of an exemplary implementation of a bus fault removal method;
FIG. 2 is a schematic flow chart diagram of a bus fault clearing method in one embodiment;
FIG. 3 is a schematic flow chart diagram of a bus fault clearing method in one embodiment;
FIG. 4 is a schematic flow chart diagram of a bus fault clearing method in one embodiment;
FIG. 5 is a schematic diagram of an embodiment of a backup power automatic switching locking circuit;
FIG. 6 is a schematic diagram of a backup automatic switching lockout circuit according to one embodiment;
fig. 7 is a block diagram of a bus bar fault removing apparatus according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, a bus fault clearing method provided in the embodiment of the present application may be applied to a computer device, and an internal structure diagram of the computer device may be as shown in fig. 1. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a bus bar fault clearing method.
Referring to fig. 2, an embodiment of the present application provides a bus fault removing method, which may be applied to a substation system, where the substation system includes a bus, a backup automatic switching locking device, a backup automatic switching locking circuit, a bus protection device, and the like, which are electrically connected to each other. The bus comprises a plurality of sections of sub-buses, the plurality of sections of sub-buses are electrically connected, and circuit breakers are arranged at connecting nodes of the plurality of sections of sub-buses. The transformer substation system can be a 110KV transformer substation, and can also be a 10KV transformer substation. The following embodiments illustrate the case where the method is applied to the computer device in fig. 1 for performing bus fault removal, and include the following steps:
s100, determining a bus differential current according to the current of each interval node of a bus in the transformer substation, wherein the bus differential current is the vector sum of the currents of each interval node of a plurality of sections of main and auxiliary lines.
The bus is a junction for the electric energy circulation of the transformer substation and is an extremely important power device in the transformer substation, and the bus is generally connected with a bus protection device and a spare power automatic switching device. The bus is generally divided into a plurality of interval nodes, including the multisection sub-bus, electric connection between the multisection sub-bus, can carry out electric connection through circuit breaker etc. between the multisection sub-bus, the circuit breaker is used for control right the bus carries out the segmentation protection. The interval node may refer to an electrical connection point between the multi-segment sub-buses, and may also include an electrical connection point between the bus and other electrical equipment, such as a high-voltage side circuit breaker. The bus differential current is the vector sum of the current of each interval node of the bus and is used for representing the current state of the bus in the operation process. The current of each interval node of the bus can be collected through an ammeter, a current transformer and the like, and then is transmitted to the computer equipment for analysis and calculation to obtain the bus differential current. In this embodiment, the current obtaining method and the current collecting path of each interval node of the bus are not limited at all, and may be specifically selected according to actual conditions.
S200, determining bus voltage drop according to the initial voltage and the working voltage of the two ends of the bus, wherein the bus voltage drop is used for representing the voltage drop of the bus.
The bus voltage drop refers to the voltage reduction of the bus before and after operation, namely the difference between the initial voltage and the operating voltage, and the bus voltage drop refers to the voltage reduction of the bus and is used for representing the voltage state of the bus in the operation process. The initial voltage of the bus is the voltage when the bus is just started to work, and can also be understood as the voltage when the bus is in a normal working state. The working voltage refers to the voltage collected by the bus in the working state, namely the voltage of the bus in the operation process, and the working voltage is used for representing the voltage of the bus in the operation state. The initial voltage and the working voltage can be collected according to devices such as a voltmeter and a voltage transformer, and the collection or acquisition mode of the initial voltage and the working voltage of the bus is not particularly limited in this embodiment and can be specifically selected according to actual conditions.
S300, determining whether the bus has a fault according to the bus differential flow and the bus voltage drop.
The bus fault refers to a fault that a bus and a lead directly connected with the bus are short-circuited, and the bus fault is characterized in that: such as a loss of voltage, a decrease in voltage, a loss of current, i.e. a decrease in the bus voltage, an increase in the supply interval current, etc. In this embodiment, the bus differential current is used to represent a current state of the bus in an operation process, and the bus voltage drop is used to represent a voltage state of the bus in the operation process. Therefore, the operation state of the bus can be considered from two dimensions of voltage and current through the bus differential flow and the bus voltage drop, and when any parameter of the bus differential flow and the bus voltage drop exceeds a preset range, the bus can be judged to have a fault. Similarly, when the two parameters of the bus differential flow and the bus voltage drop are both in the preset range, the bus is proved to be normal.
S400, if the bus fails, determining the operation mode of the bus, wherein the operation mode comprises parallel operation and split operation.
The operation modes of the bus are divided into two types: parallel operation and split operation. For example, when the multi-segment sub-bus is two segments of the sub-bus, the parallel operation means that circuit breakers (hereinafter referred to as segmented circuit breakers) on two segments of the sub-bus connection point are in a closed position, and the two segments of the sub-bus are connected in series. The split operation means that the split circuit breaker between the two sub-buses is in a jump position, and the two sub-buses operate independently without mutual interference.
And S500, if the operation mode of the buses is parallel operation, controlling the bus protection equipment to cut off the circuit breaker connected with the fault primary-secondary line so as to remove the fault of the buses.
When the operation mode of the bus is determined to be parallel operation, namely the segmented circuit breakers are in closed positions, the multiple segments of the primary and secondary lines are connected in series, and each segment of the primary and secondary line is connected with a power line, namely, when the operation mode of the bus is parallel operation, the power lines are connected in parallel. That is, when any segment of the sub-main bus has a fault, for example, the voltage is reduced, the voltages of the sub-buses at the two ends of the segmented circuit breaker are reduced at the same time, and the short-circuit current flows through the multi-segment sub-bus, that is, through the whole segment of the bus. When any section of the primary and secondary lines have faults, the bus protection equipment electrically connected with the bus receives fault signals from the secondary buses to start, instantly start, actively disconnect the circuit breaker connected with the failed secondary buses, and cut off the circuit breaker connected with the bus so as to remove the faults of the bus, and the rest of the primary and secondary lines work normally. Meanwhile, the bus protection equipment is automatically switched into a normal standby power supply line of the sub-bus, the voltage of the sub-bus in normal operation is recovered, the power load loss is reduced, and the influence of line faults is reduced. At this time, the fault primary-secondary line is cut off, one side of two ends of the segmented circuit breaker has voltage, and the other side of the segmented circuit breaker has no voltage, so that the discharge logic of the automatic backup power switching device is met, and therefore the automatic backup power switching device does not act, and locking or other actions on the automatic backup power switching device are not needed. Therefore, when the operation mode of the bus is parallel operation, the fault problem does not need to be considered as long as the bus protection equipment is connected.
S600, if the operation mode of the bus is split operation, the bus protection equipment is controlled to cut off a circuit breaker connected with the fault primary-secondary line, and a spare power automatic switching device is locked to cut off the fault of the bus.
When the operation mode of the bus is split operation, the two sub buses are independent and do not influence each other. When any one of the sub-buses is in fault, the bus protection equipment electrically connected with the bus receives a fault signal from the sub-bus to start and instantly start, and delays to disconnect the breaker connected with the sub-bus in fault and cut off the breaker connected with the bus so as to cut off the fault of the bus. After the spare power automatic switching device receives the circuit breaker jump position signal, the spare power automatic switching device is locked and is in an open position, so that the phenomenon that the accident is enlarged due to the fact that the sectionalized circuit breaker is closed to the bus fault by the spare power automatic switching device after the bus protection equipment cuts off the fault is avoided, and the safety of the transformer substation system is improved.
The embodiment of the application provides a bus fault removing method, when a bus breaks down, the running mode of the bus is judged firstly, a circuit breaker connected with a fault primary-secondary line is cut off, and a spare power automatic switching device is locked to remove the fault of the bus. According to the embodiment of the application, when the operation mode of the bus is split operation, the spare power automatic switching device is actively locked, so that the condition that when the fault signal of the bus is consistent with the action starting signal of the spare power automatic switching device, the action of the spare power automatic switching device is combined with the action starting signal of the fault sub-bus, and unsafe accidents are caused is avoided. The bus fault removing method solves the technical problem that an existing bus fault removing system is low in safety in the prior art, and achieves the technical effect of improving safety of the bus fault removing system.
Referring to fig. 3, in one embodiment, step S600 includes:
s610, if the operation mode of the bus is the split operation, determining the fault type of the fault, wherein the fault type comprises the following steps: single section bus fault and double section bus fault.
As described above, the bus fault refers to a fault in which a short circuit occurs in the bus and a conductor directly connected to the bus, and the bus fault is characterized by: such as a loss of voltage, a decrease in voltage, a loss of current, i.e. a decrease in the bus voltage, an increase in the supply interval current, etc. The bus comprises a plurality of sections of the bus, and the sub-buses are connected through the section circuit breakers. The bus is connected with one or more power cords, for example, when the power cord is one, connect in arbitrary section sub-bus, when the power cord is many, the power cord can distribute in segmentation circuit breaker's same side, also can distribute in segmentation circuit breaker's both sides. The single-section bus fault refers to that the primary and secondary lines on one side of the segmented circuit breaker are in fault, and the double-section bus fault refers to that the secondary buses on two sides of the segmented circuit breaker are in fault.
And S620, if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus.
When the fault is a single-section bus fault, the fault means that only one of the sub-buses on both sides of the sectionalizer has the fault. When the fault type is the single-section bus fault, the action logic of the spare power automatic switching device is not met, namely the spare power automatic switching device does not act, and when the spare power automatic switching device does not act, the fault accident is not expanded, so that the spare power automatic switching device does not need to be actively locked. Therefore, when the fault type is the single-section bus fault, the spare power automatic switching device does not need to be locked, and the fault can be cut off only by the action of the bus protection equipment for cutting off the circuit breaker connected with the fault main-sub line.
And S630, if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
When the fault type is a double-section bus fault, the fault type means that the sub buses positioned at two sides of the segmented circuit breaker have faults, and the action logic of the spare power automatic switching device is met, so that after the bus protection equipment acts, the spare power automatic switching device can act on a circuit breaker of a spare power line, and the spare power automatic switching device is combined with the fault sub bus. In this case, the short-circuit current generated by the faulty sub-bus may flow through the transformer of the previous stage voltage, and the transformer may be burned out in a serious case. Therefore, when the fault type is a double-section bus fault, the backup automatic switching device needs to be locked.
In one embodiment, step S630 includes: and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus. The delay time may be determined according to an actual situation, and may be, for example, 3500ms, and the like, and the embodiment is not particularly limited.
Referring to fig. 4, in one embodiment, step S500 includes:
and S510, if the operation mode of the buses is parallel operation, determining whether the fault sub-bus and the power line are positioned on the same side of the sectional circuit breaker.
Only one on the generating line power supply line, perhaps only one when power supply line moves, when arbitrary section when the primary and secondary line breaks down, be located the sectionalized circuit breaker both sides the sub-generating line loses voltage simultaneously, generating line protective equipment action cut off with the circuit breaker that trouble primary and secondary line is connected, for example the sectionalized circuit breaker.
And S520, controlling the bus protection equipment to cut off a breaker connected with the fault primary-secondary line so as to cut off the fault of the bus.
When a signal that the bus has a fault is received, the bus protection equipment and the bus operate in a split mode to act the same, the circuit breaker connected with the fault primary-secondary line is cut off, the whole bus is totally subjected to voltage loss, the spare power automatic switching device is combined with the circuit breaker on the spare power line, and the voltage on the non-fault primary-secondary line is recovered.
And S530, if the fault sub-bus and the power line are positioned at the same side of the sectional breaker, the spare power automatic switching device is not locked.
When the bus protection equipment cuts off the segmented circuit breaker and the circuit breaker connected with the fault primary and secondary lines when only one power line on the bus runs, and when the fault secondary bus is the bus section hung on the power line, once the bus protection equipment acts, the whole bus is totally subjected to voltage loss, the spare power automatic switching device is combined with the circuit breaker on the spare power line, and the voltage on the non-fault primary and secondary lines is recovered.
When the fault sub-bus is not the bus hooked by the power line, after the bus protection equipment acts, the fault sub-bus is cut off and isolated, the non-fault sub-bus continues to operate, and the action logic of the spare power automatic switching device is not met, so that the spare power automatic switching device does not act, and the spare power automatic switching device does not need to be locked.
In one embodiment, the bus fault clearing method further includes: and if the bus is in the maintenance state, locking the spare power automatic switching device.
When the bus is overhauled, signals such as short-circuit current and the like are inevitably generated on the bus, and when the electric signal generated on the bus is consistent with the action signal of the spare power automatic switching device, the spare power automatic switching device can act and is put into the bus. Therefore, in order to avoid the backup automatic switching device from malfunctioning to cause a line fault, the backup automatic switching device should be locked to improve the operation safety when the bus is repaired.
Referring to fig. 5, in an embodiment, the backup power automatic switching locking circuit 20 includes: the automatic bus transfer device comprises a spare power automatic switching device 21, a sectional control switch 22, a bus bar protection device 23 and a first outlet pressing plate 24.
The backup power automatic switching locking loop 20 is an additional backup power automatic switching total locking open loop, and can lock the backup power automatic switching device 21 after the bus protection equipment 23 works. The spare power automatic switching device 21 is a protection device in an electric power system and is fully called a microcomputer circuit spare power automatic switching protection device, a core part of the spare power automatic switching device 21 adopts a high-performance single chip microcomputer, and the spare power automatic switching device comprises a CPU module, a relay module, an alternating current power supply module, a man-machine conversation module and the like, and has the advantages of being strong in anti-interference performance, stable, reliable, convenient to use and the like. The backup power automatic switching device 21 is used for switching into the bus to provide a function of a backup power supply for the bus when the bus fails in the backup power automatic switching locking circuit 20. In this embodiment, the types and the like of the backup power automatic switching device 21 are not selected at all, and only the bus protection function needs to be realized.
One end of the sectional control switch 22 is electrically connected with the negative end of the backup power automatic switching device 21, and the other end is connected with the bus protection device 23. The section control switch 22 may include a section breaker connecting two sections of the sub-buses, and switches on two sides of the bus, and the like, for controlling connection and disconnection between the sub-buses and connection and disconnection between the spaced nodes in different sections, and facilitating monitoring of operation states of different sub-bus nodes. Meanwhile, the section control switch 22 can be replaced by a voltage transformer or a current transformer, and the like, and meanwhile, the monitoring of the bus operation state can also be met.
One end of the bus bar protection device 23 is electrically connected with the other end of the section control switch 22. The bus bar protection device 23 may be specifically selected and designed according to actual conditions, and is mainly used for protecting the bus bar when the bus bar fails. For example, bus differential protection, bus-coupled charging protection, and the like can be used.
The first outlet pressing plate 24 is connected in series between the positive terminal of the backup power automatic switching device 21 and the other end of the bus bar protection device 23. The first outlet pressing plate 24 is used for providing an operating point, the bus bar protection device 23 and the section control switch 22 are electrically connected with the bus bar, and the work of the bus bar protection device 23 and the operation of the section control switch 22 are controlled by the state signal of the bus bar. The first outlet pressing plate 24 is provided in the embodiment, so as to provide a control point for the backup power automatic switching locking loop 20, so that a worker can conveniently control the backup power automatic switching locking loop. For example: the switches of the bus protection equipment 23 and all the switches in the segment control switch 22 are all in a closed position, when the automatic bus transfer device 21 needs to be manually controlled, the automatic bus transfer device 21 can be opened and closed only by pressing the first outlet pressing plate 24, and the automatic bus transfer device is simple to operate and high in safety.
Referring to fig. 6, in an embodiment, the backup power automatic switching locking circuit 20 includes: the backup power automatic switching device 21, the sectionalizing control switch 22, the bus bar protection device 23, and the second outlet pressing plate 2524. The backup power automatic switching device 21, the sectionalizing control switch 22, the bus bar protection device 23, and the second outlet pressing plate 25 are all the same as the backup power automatic switching device 21, the sectionalizing control switch 22, the bus bar protection device 23, and the first outlet pressing plate 24 in the above embodiments, and different from the above embodiments, the connection relationship among the backup power automatic switching device 21, the sectionalizing control switch 22, the bus bar protection device 23, and the second outlet pressing plate 25 is as follows:
one end of the sectional control switch 22 is electrically connected with the negative end of the automatic bus transfer device 21, the bus protection device 23 is connected in series between the positive end of the automatic bus transfer device 21 and the other end of the sectional control switch 22, and the second outlet pressing plate 25 is connected in parallel with the bus protection device 23. Part of the backup automatic switching devices 21 lack a master function of locking and are opened, but have a backup automatic switching function, so locking the backup automatic switching devices 21 can adopt a mode of exiting the backup automatic switching function, the principle is similar to that of adding a locking circuit, the difference is that the logic of exiting the backup automatic switching devices 21 is completely opposite, the exit of the backup automatic switching function circuit needs a dynamic disconnection point applying bus protection action, that is, the second outlet pressing plate 25 is connected in parallel with the bus protection device 23, and when the bus protection action is performed, the bus protection device 23 can realize locking of the backup automatic switching devices 21 by disconnecting the backup automatic switching function opening circuit through disconnecting the second outlet pressing plate 25.
It should be understood that, although the steps in the flowchart are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in the figures may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution of the steps or stages is not necessarily sequential, but may be performed alternately or in alternation with other steps or at least some of the other steps or stages.
Referring to fig. 7, an embodiment of the present application provides a bus bar fault clearing apparatus 10, including: the bus differential flow determining module 100, the bus voltage drop determining module 200, the fault bus determining module 300, the operation mode determining module 400, the first fault removing module 500 and the second fault removing module 600.
The bus differential current determining module 100 is configured to determine a bus differential current according to a current of each interval node of a bus in a substation, where the bus differential current is a vector sum of currents of each interval node of multiple segments of sub-buses;
the bus voltage drop determining module 200 is configured to determine a bus voltage drop according to an initial voltage and a working voltage at two ends of the bus, where the bus voltage drop is used to represent a voltage drop amount of the bus;
the faulty bus determining module 300 is configured to determine whether the bus has a fault according to the bus differential flow and the bus voltage drop;
the operation mode determining module 400 is configured to determine an operation mode of the bus if the bus fails, where the operation mode includes parallel operation and split operation;
the first fault removing module 500 is configured to control the bus protection device to cut off the circuit breaker connected to the faulty primary-secondary line if the operation mode of the bus is parallel operation, so as to remove the fault of the bus;
the second fault removing module 600 is configured to control the bus protection device to cut off a circuit breaker connected to the faulty main and sub-bus and lock the backup automatic switching device if the operation mode of the bus is split operation, so as to remove the fault of the bus.
In an embodiment, the second fault removing module 600 is further configured to determine a fault type of the fault if the operation mode of the bus is split-column operation, where the fault type includes: single section bus fault and double section bus fault; if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus; and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
In an embodiment, the second fault removing module 600 is further configured to, if the fault type is a double-section bus fault, control the bus protection device to delay and cut off a circuit breaker connected to the faulty main bus and the secondary bus, and lock the backup automatic switching device, so as to remove the fault of the bus.
In one embodiment, the first fault removing module 500 is further configured to determine whether the fault sub-bus and the power line are on the same side of the sectionalizing circuit breaker if the bus runs in parallel; controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus; and if the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker, the spare power automatic switching device is not locked.
In one embodiment, the bus bar fault clearing device 10 is further configured to lock the backup power automatic switching device if the bus bar is in a maintenance state.
In one embodiment, the backup power automatic switching locking loop comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device; one end of the bus protection equipment is electrically connected with the other end of the sectional control switch; and the first outlet pressing plate is connected between the positive end of the spare power automatic switching device and the other end of the bus protection equipment in series.
In one embodiment, the backup power automatic switching locking loop comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device; the bus protection equipment is connected in series between the positive terminal of the spare power automatic switching device and the other end of the sectional control switch; and the second outlet pressing plate is connected with the bus protection equipment in parallel.
For specific limitations of the bus bar fault clearing device 10, reference may be made to the above limitations of the bus bar fault clearing method, which will not be described herein again. The modules in the bus bar fault clearing device 10 described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, there is provided a computer device comprising: the system comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the following steps when executing the computer program:
determining bus differential current according to current of each interval node of a bus in a transformer substation, wherein the bus differential current is vector sum of current of each interval node of a multi-section main bus;
determining bus voltage drop according to the initial voltage and the working voltage at the two ends of the bus, wherein the bus voltage drop is used for representing the voltage reduction of the bus;
determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
if the bus fails, determining the operation mode of the bus, wherein the operation mode comprises parallel operation and split operation;
if the operation mode of the buses is parallel operation, controlling bus protection equipment to cut off a circuit breaker connected with a fault primary-secondary line so as to remove the fault of the buses;
and if the operation mode of the bus is split operation, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking a spare power automatic switching device to cut off the fault of the bus.
In one embodiment, the processor, when executing the computer program, further implements: if the operation mode of the bus is split operation, determining the fault type of the fault, wherein the fault type comprises the following steps: single section bus fault and double section bus fault; if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus; and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, the processor, when executing the computer program, further implements: and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, the processor, when executing the computer program, further implements: if the operation mode of the buses is parallel operation, determining whether the fault sub-bus and the power line are positioned at the same side of the segmented circuit breaker; controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus; and if the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker, the spare power automatic switching device is not locked.
In one embodiment, the processor, when executing the computer program, further implements: and if the bus is in the maintenance state, locking the spare power automatic switching device.
In one embodiment, the processor, when executing the computer program, further implements: the spare power automatic switching locking circuit comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device; one end of the bus protection equipment is electrically connected with the other end of the sectional control switch; and the first outlet pressing plate is connected between the positive end of the spare power automatic switching device and the other end of the bus protection equipment in series.
In one embodiment, the processor, when executing the computer program, further implements: the spare power automatic switching locking circuit comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device; the bus protection equipment is connected in series between the positive terminal of the spare power automatic switching device and the other end of the sectional control switch; and the second outlet pressing plate is connected with the bus protection equipment in parallel.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
determining bus differential current according to current of each interval node of a bus in a transformer substation, wherein the bus differential current is vector sum of current of each interval node of a multi-section main bus;
determining bus voltage drop according to the initial voltage and the working voltage at the two ends of the bus, wherein the bus voltage drop is used for representing the voltage reduction of the bus;
determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
if the bus fails, determining the operation mode of the bus, wherein the operation mode comprises parallel operation and split operation;
if the operation mode of the buses is parallel operation, controlling bus protection equipment to cut off a circuit breaker connected with a fault primary-secondary line so as to remove the fault of the buses;
and if the operation mode of the bus is split operation, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking a spare power automatic switching device to cut off the fault of the bus.
In one embodiment, the computer program when executed by the processor further implements: if the operation mode of the bus is split operation, determining the fault type of the fault, wherein the fault type comprises the following steps: single section bus fault and double section bus fault; if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus; and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, the computer program when executed by the processor further implements: and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus.
In one embodiment, the computer program when executed by the processor further implements: if the operation mode of the buses is parallel operation, determining whether the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker; controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus; and if the fault sub-bus and the power line are positioned at the same side of the sectional circuit breaker, the spare power automatic switching device is not locked.
In one embodiment, the computer program when executed by the processor further implements: and if the bus is in the maintenance state, locking the spare power automatic switching device.
In one embodiment, the computer program when executed by the processor further implements: the spare power automatic switching locking circuit comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device; one end of the bus protection equipment is electrically connected with the other end of the sectional control switch; and the first outlet pressing plate is connected between the positive end of the spare power automatic switching device and the other end of the bus protection equipment in series.
In one embodiment, the computer program when executed by the processor further implements: the spare power automatic switching locking circuit comprises: a spare power automatic switching device; one end of the sectional control switch is electrically connected with the negative electrode end of the spare power automatic switching device; the bus protection equipment is connected in series between the positive electrode end of the spare power automatic switching device and the other end of the sectional control switch; and the second outlet pressing plate is connected with the bus protection equipment in parallel.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A bus fault removing method is applied to a substation system and comprises the following steps:
determining bus differential current according to current of each interval node of a bus in a transformer substation, wherein the bus differential current is vector sum of current of each interval node of a multi-section main bus;
determining bus voltage drop according to the initial voltage and the working voltage at the two ends of the bus, wherein the bus voltage drop is used for representing the voltage reduction of the bus;
determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
if the bus fails, determining the operation mode of the bus, wherein the operation mode comprises parallel operation and split operation;
if the operation mode of the buses is parallel operation, determining whether the fault sub-bus and the power line are positioned at the same side of the segmented circuit breaker; controlling bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus; if the fault sub-bus and the power line are positioned at the same side of the segmented circuit breaker, the spare power automatic switching device is not locked;
if the operation mode of the bus is split operation, determining the fault type of the fault, wherein the fault type comprises the following steps: single section bus fault and double section bus fault; if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus; and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary and secondary lines, and locking the spare power automatic switching device to remove the fault of the bus.
2. The method for removing the bus fault according to claim 1, wherein if the fault type is a double-section bus fault, controlling the bus protection device to cut off a circuit breaker connected to the faulty main bus and to lock the backup automatic switching device to remove the fault of the bus comprises:
and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus.
3. The bus bar fault clearing method according to claim 1, further comprising:
and if the bus is in the maintenance state, locking the spare power automatic switching device.
4. The bus bar fault clearing method according to claim 1, wherein the blocking circuit of the backup power automatic switching device comprises:
a spare power automatic switching device;
one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device;
one end of the bus protection equipment is electrically connected with the other end of the sectional control switch;
and the first outlet pressing plate is connected between the positive end of the spare power automatic switching device and the other end of the bus protection equipment in series.
5. The bus bar fault clearing method according to claim 1, wherein the blocking circuit of the backup power automatic switching device comprises:
a spare power automatic switching device;
one end of the sectional control switch is electrically connected with the negative end of the spare power automatic switching device;
the bus protection equipment is connected in series between the positive terminal of the spare power automatic switching device and the other end of the sectional control switch;
and the second outlet pressing plate is connected with the bus protection equipment in parallel.
6. A bus bar fault clearing apparatus, the apparatus comprising:
the bus differential current determining module is used for determining bus differential current according to current of each interval node of a bus in the transformer substation, and the bus differential current refers to vector sum of current of each interval node of a plurality of sections of main and secondary lines;
the bus voltage drop determining module is used for determining bus voltage drop according to initial voltage and working voltage at two ends of the bus, wherein the bus voltage drop is used for representing the voltage drop of the bus;
the fault bus determining module is used for determining whether the bus has a fault according to the bus differential flow and the bus voltage drop;
the operation mode determining module is used for determining the operation mode of the bus if the bus fails, wherein the operation mode comprises parallel operation and split operation;
the first fault removing module is used for determining whether the fault sub-bus and the power line are positioned on the same side of the sectional circuit breaker or not if the operation mode of the buses is parallel operation; controlling bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to cut off the fault of the bus; if the fault sub-bus and the power line are positioned at the same side of the segmented circuit breaker, the spare power automatic switching device is not locked;
the second fault removing module is configured to determine a fault type of the fault if the operation mode of the bus is split operation, where the fault type includes: single section bus fault and double section bus fault; if the fault type is the single-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line so as to remove the fault of the bus; and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line, and locking the spare power automatic switching device to remove the fault of the bus.
7. The apparatus of claim 6, wherein the second fault removal module is further configured to:
and if the fault type is a double-section bus fault, controlling the bus protection equipment to cut off a circuit breaker connected with the fault primary-secondary line in a delayed manner, and locking the spare power automatic switching device to remove the fault of the bus.
8. The apparatus of claim 6, wherein the apparatus is further configured to: and if the bus is in the maintenance state, locking the spare power automatic switching device.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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