CN118213955A - Main transformer protection method and system based on operation mode in hand-in-hand power supply mode - Google Patents
Main transformer protection method and system based on operation mode in hand-in-hand power supply mode Download PDFInfo
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Abstract
The application provides a main transformer protection method and a system based on an operation mode in a hand-in-hand power supply mode, and the method and the system relate to the field of relay protection of power systems and comprise the following steps of automatically inputting corresponding main transformer protection functions according to the state of a main transformer breaker; when the main transformer has a failure fault or a dead zone fault, the line breaker is correctly and selectively tripped according to the operation mode, and the fault is removed; after the two faults trip the incoming line breaker, the automatic backup switching function of the corresponding transformer substation is selectively locked by utilizing the GOOSE signal according to the operation mode, and reclosing protection and incoming line closing can be correctly locked. The application has the advantages that: the application can correctly identify the incoming line power supply, instantly disconnect the power supply to cut off faults, selectively lock the spare power automatic switching function and reclosing protection of corresponding stations, avoid secondary power receiving of fault points and enlarge the accident range.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and particularly relates to a main transformer protection method and system based on an operation mode in a hand-in-hand power supply mode.
Background
The hand-in-hand power supply mode means that the transformer substation only needs to be connected with one line of incoming power supply from the local power grid, and the other line of incoming power supply is connected with the adjacent station through the connecting line, so that two adjacent transformer substations connected with the connecting line are mutually standby power supplies.
Under ideal conditions, the two-way incoming line circuit breakers of the main supply mode transformer substation are in the combined position, the non-tie line incoming line circuit breakers of the standby supply mode transformer substation are in the separated position, the tie line incoming line circuit breakers are in the combined position, and the main supply mode transformer substation supplies power to the standby supply mode transformer substation through the tie line.
When the tripping of the main transformer circuit breaker in operation fails, or the spare main transformer in split position has dead zone fault, the power circuit breaker at the front end of the main transformer circuit breaker can be correctly tripped, the spare automatic switching start of the corresponding transformer substation and the reclosing of the line incoming circuit breaker of the connecting line are locked according to the operation mode, and the secondary power receiving of a fault point is prevented, so that the fault range is widened.
The problems are that:
Problem 1: when the main transformer circuit breaker of the transformer substation has a failure fault or dead zone fault, the power supply is required to be correctly cut off, and the power circuit breaker of the transformer substation can be changed according to the power supply mode and the position of the connecting line;
Problem 2: when a power supply at the front end of a fault main transformer of a main supply mode transformer substation, namely a non-interconnecting line incoming circuit breaker is disconnected, the interconnecting line is out of voltage, and the interconnecting line incoming circuit breaker of the main supply mode transformer substation can generate reclosing actions due to voltage-losing tripping, the power supply of a standby supply mode transformer substation, namely the interconnecting line incoming circuit breaker is out of voltage, so that the standby supply mode transformer substation can start the automatic switching of the interconnecting line, power is supplied to the main supply transformer substation through the interconnecting line, and a fault point can be subjected to secondary power receiving, so that the non-interconnecting line incoming circuit breaker connected with a local electric network of the standby supply mode transformer substation trips;
Problem 3: when the power supply at the front end of the main transformer of the fault of the standby mode transformer substation, namely the connecting line incoming circuit breaker is disconnected, if the fault is a failure action, the states of the two main transformer circuit breakers are kept unchanged, and the hidden danger of the standby power supply of the standby mode transformer substation, namely the non-connecting line incoming circuit breaker, is caused by error combination for recovering the power supply, and even if the fault is a dead zone action, the standby power supply should not be combined.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a main transformer protection method and a main transformer protection system based on an operation mode in a hand-in-hand power supply mode, which can correctly and selectively trip a line-in breaker according to the operation mode, cut off faults, selectively lock the spare power automatic switching function of a corresponding transformer substation by using a GOOSE signal, and correctly lock reclosing protection and line-in closing.
The invention adopts the following technical scheme:
The main transformer protection method based on the operation mode of the hand-in-hand power supply mode is characterized in that two line-in-line circuit breakers of a main power supply mode transformer substation are in a combined position and are connected with a standby power supply mode transformer substation through a connecting line, the connecting line-in-line circuit breakers of the standby power supply mode transformer substation are in the combined position, and the non-connecting line-in-line circuit breakers are in the separated position; characterized in that the method comprises the following steps:
according to the running state, a main transformer circuit breaker in the transformer substation automatically inputs a corresponding main transformer protection function;
When the main transformer has a failure fault or a dead zone fault, the line breaker is selectively tripped according to the operation mode of the transformer substation, and the fault is removed;
After the incoming line circuit breaker is tripped, the automatic backup power switching function of the corresponding transformer substation is selectively locked by utilizing the GOOSE signal according to the operation mode of the transformer substation, and reclosing protection and incoming line closing are correctly locked.
The invention further includes the following preferred embodiments.
The running state of the main transformer circuit breaker refers to two states that the main transformer circuit breaker is in a split state or the main transformer circuit breaker is in a combined state.
Further, the method comprises the steps of,
When the main transformer circuit breaker is in the combination position, the main transformer circuit breaker is automatically put into failure protection;
when the main transformer circuit breaker is in the split position, the dead zone protection of the main transformer circuit breaker is automatically put into operation.
Further, the method comprises the steps of,
When the main transformer circuit breaker generates a failure fault, the main transformer circuit breaker generates a failure protection action, wherein the failure fault refers to the failure fault when the main transformer circuit breaker is still in a closing position after the main transformer circuit breaker is tripped in the protection action, and the failure fault is generated;
when the main transformer circuit breaker generates a dead zone fault, the dead zone protection action is performed, wherein the dead zone fault refers to the situation that when a section of line between the main transformer circuit breaker and a corresponding current transformer in the direction of the power side fails, the current flowing through the current transformer is larger than a dead zone overcurrent fixed value, and the fault current keeping time exceeds the dead zone protection time limit, and then the dead zone fault occurs.
Further, the method comprises the steps of,
The operation mode of the transformer substation comprises a combination of a power supply mode and a tie line position, wherein the power supply mode is divided into a main power supply mode and a standby power supply mode, and the tie line position is divided into a tie line 1# inlet wire and a tie line 2# inlet wire.
Further, the method comprises the steps of,
When the main power supply mode transformer substation is in the failure protection action of the main power transformer circuit breaker at the combined position or in the dead zone protection action of the main power transformer circuit breaker at the separated position, the main power supply mode transformer substation is disconnected from the main power supply mode transformer substation, namely a non-connecting line incoming circuit breaker of the main power supply mode transformer substation; and simultaneously, sending a GOOSE signal to a neighboring station standby mode transformer station connected by the connecting wire so as to lock the standby power mode transformer station connecting wire standby automatic switching device, and locking the reclosing of the main power mode transformer station connecting wire breaker by the GOOSE signal.
Further, the method comprises the steps of,
When the main transformer circuit breaker of the standby mode transformer substation is in the combined position and fails to protect the action, or the main transformer circuit breaker of the separated position is in the dead zone protecting action, the contact line incoming circuit breaker of the standby mode transformer substation is tripped; and simultaneously, a GOOSE signal is sent out to lock the local station to close the non-tie line incoming circuit breaker of the ready-to-supply mode transformer substation.
Further, the method comprises the steps of,
The substation operation mode comprises the following steps:
Main supply mode + tie 1# inlet wire, standby supply mode + tie 1# inlet wire, main supply mode + tie 2# inlet wire, standby supply mode + tie 2# inlet wire.
Further, the method comprises the steps of,
When the main transformer has failure or dead zone faults, the operation mode of the transformer substation is judged, when the operation mode is a main supply mode and a contact line 1# inlet wire, the contact line 1# inlet wire breaker is jumped, when the operation mode is a standby supply mode and a contact line 1# inlet wire, the contact line 1# inlet wire breaker is jumped, when the operation mode is a main supply mode and a contact line 2# inlet wire, the contact line 1# inlet wire breaker is jumped, and when the operation mode is a standby supply mode and a contact line 2# inlet wire, the contact line 2# inlet wire breaker is jumped.
Further, the method comprises the steps of,
When the operation mode of the transformer substation is a main supply mode and a contact line 1# incoming line, locking a contact line spare power automatic switching of a neighboring station, namely a spare supply mode transformer substation; when the operation mode of the transformer substation is a standby mode and a connecting line 1# incoming line, closing the 2# incoming line of the transformer substation; when the operation mode of the transformer substation is a main supply mode and a contact line 2# incoming line, locking the contact line automatic switching of the transformer substation in a standby supply mode when the adjacent station is locked; and when the operation mode of the transformer substation is the standby mode and the connecting line 2# incoming line, closing the 1# incoming line of the station.
Further, the method comprises the steps of,
When the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
The application simultaneously requests to protect a main transformer protection system based on an operation mode by utilizing a hand-in power supply mode of the main transformer protection method, which comprises a substation operation mode judging module, a main transformer breaker state judging and protecting control module and a wire inlet breaker control module; the method is characterized in that:
The substation operation mode judging module judges the operation mode of the substation according to the switching state of the two-way incoming line circuit breaker and the connecting line position pressing plate;
the state judgment and protection control module of the main transformer circuit breaker automatically inputs corresponding main transformer protection functions according to the running state of the main transformer circuit breaker;
When the main transformer circuit breaker fails or has dead zone faults, the incoming circuit breaker control module selectively breaks the incoming circuit breaker according to the operation mode of the transformer substation, removes faults, selectively locks the spare power automatic switching function of the corresponding transformer substation by using the GOOSE signal, and correctly locks reclosing protection and incoming closing.
Further, the method comprises the steps of,
The substation operation mode comprises the following steps: a main supply mode, a connecting line 1# inlet wire, a standby supply mode, a connecting line 1# inlet wire, a main supply mode, a connecting line 2# inlet wire and a standby supply mode, and a connecting line 2# inlet wire;
The main supply mode is that two line-incoming circuit breakers of a transformer substation are in a combined position and are connected with a standby supply mode transformer substation through a connecting line, and the standby supply mode is that the connecting line-incoming circuit breakers of the transformer substation are in a combined position and the non-connecting line-incoming circuit breakers are in a separated position.
Further, the method comprises the steps of,
When the state judgment and protection control module of the main transformer circuit breaker judges that the main transformer circuit breaker is in the closing position, the main transformer circuit breaker is automatically put into failure protection;
and when the state judgment and protection control module judges that the main transformer circuit breaker is in the split state, the dead zone protection of the main transformer circuit breaker is automatically thrown in.
Further, the method comprises the steps of,
The incoming line circuit breaker control module comprises an incoming line circuit breaker tripping selection unit and an incoming line circuit breaker latching selection unit;
The wire inlet breaker tripping unit is used for selectively tripping the wire inlet breaker according to the operation mode of the transformer substation and cutting off faults;
And the incoming line breaker selection locking unit is used for selectively locking the spare power automatic switching function of the corresponding transformer substation by utilizing the GOOSE signal according to the operation mode of the transformer substation after the incoming line breaker is tripped, and correctly locking reclosing protection and incoming line closing.
Further, the method comprises the steps of,
After the main transformer has a failure fault or a dead zone fault,
When the operation mode is a main supply mode and the connecting line 1# is in line, the line incoming breaker is a trip unit trip 2# line incoming breaker;
when the operation mode is the standby mode and the interconnection line 1# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 1# wire inlet circuit breaker;
When the operation mode is a main supply mode and the connecting line is 2# incoming line, the incoming line breaker is a trip unit trip 1# incoming line breaker;
when the operation mode is the standby mode and the interconnection line 2# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 2# wire inlet circuit breaker.
Further, the method comprises the steps of,
When the operation mode of the transformer substation is a main supply mode and a connecting line 1# incoming line is adopted, the incoming line breaker selects a locking unit to lock a connecting line spare power automatic switching of a transformer substation in a spare supply mode when a neighboring station is locked;
When the operation mode of the transformer substation is a standby mode and a connecting line 1# incoming line is connected, the incoming line breaker selects a locking unit to lock the 2# incoming line of the station to be closed;
When the operation mode of the transformer substation is a main supply mode and a connecting line 2# incoming line, the incoming line breaker selects a locking unit to lock a neighboring station, namely the automatic switching of the connecting line of the transformer substation in a standby supply mode;
When the operation mode of the transformer substation is the standby mode and the connecting line 2# incoming line is connected, the incoming line breaker selects the locking unit to lock the 1# incoming line of the station to be closed.
Further, the method comprises the steps of,
When the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
The application also protects a computer system, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and is characterized in that the processor realizes the steps of the main transformer protection method based on the running mode of the hand-in-hand power supply mode when executing the computer program.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the main transformer protection method of the above-mentioned hand-in-hand power supply mode based on an operation mode.
Compared with the prior art, the application has the following advantages:
1) The incoming line power supply can be correctly identified, and the power supply is instantaneously disconnected to cut off faults.
2) When the main transformer fails, the spare power automatic switching function and reclosing protection of the corresponding station can be selectively locked, and the secondary power receiving of the failure point is avoided, so that the accident range is enlarged.
3) The invention can be realized by upgrading the program of the existing protection device without adding new equipment.
Drawings
Fig. 1 is a schematic diagram of a hand-in-hand power supply mode substation using a tie line 1# incoming line;
fig. 2 is a schematic diagram of a hand-in-hand power supply mode substation using a tie line #2 incoming line;
Fig. 3 is a schematic flow chart of a main transformer protection method based on an operation mode in the hand-in-hand power supply mode of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are within the scope of the present application.
As shown in fig. 3, the application discloses a main transformer protection method based on a hand-in-hand power supply mode, wherein two incoming line breakers of a main power supply mode transformer substation are in a combined position and are connected with a standby power supply mode transformer substation through a connecting wire, the connecting wire incoming line breakers of the standby power supply mode transformer substation are in the combined position, and the non-connecting wire incoming line breakers are in a separated position; the method comprises the following steps:
According to the state, a main transformer circuit breaker in the transformer substation automatically inputs a corresponding main transformer protection function;
The main transformer circuit breaker state refers to two states of the main transformer circuit breaker in a split state or the main transformer circuit breaker in a combined state. When the main transformer circuit breaker is in the combination position, the main transformer circuit breaker is automatically put into failure protection; when the main transformer circuit breaker is in the split position, the dead zone protection of the main transformer circuit breaker is automatically put into operation.
When the main transformer circuit breaker generates a failure fault, the main transformer circuit breaker generates a failure protection action, wherein the failure fault refers to the failure fault when the main transformer circuit breaker is still in a closing position after the main transformer circuit breaker is tripped in the protection action, and the failure fault is generated;
when the main transformer circuit breaker generates a dead zone fault, the dead zone protection action is performed, wherein the dead zone fault refers to the situation that when a section of line between the main transformer circuit breaker and a corresponding current transformer in the direction of the power side fails, the current flowing through the current transformer is larger than a dead zone overcurrent fixed value, and the fault current keeping time exceeds the dead zone protection time limit, and then the dead zone fault occurs.
When the main transformer has a failure fault or a dead zone fault, the line breaker is selectively tripped according to the operation mode of the transformer substation, and the fault is removed;
After the incoming line power supply is disconnected, the automatic backup power switching function of the corresponding transformer substation is selectively locked by utilizing the GOOSE signal according to the operation mode of the transformer substation, and reclosing protection and incoming line closing are correctly locked.
The operation mode of the transformer substation comprises a combination condition of a power supply mode and a connecting line position, wherein the power supply mode is divided into a main power supply mode transformer substation and a standby power supply mode transformer substation, and the connecting line position is divided into a connecting line 1# inlet wire and a connecting line 2# inlet wire.
In the preferred embodiment of the present invention, as shown in fig. 1 and fig. 2, four cases of a main supply mode+a tie line 1# incoming line, a standby supply mode+a tie line 1# incoming line, a main supply mode+a tie line 2# incoming line, and a standby supply mode+a tie line 2# incoming line are shown.
When the main power supply mode transformer substation is in the failure protection action of the main power transformer circuit breaker at the closing position or in the dead zone protection action of the main power transformer circuit breaker at the dividing position, the non-contact line incoming circuit breaker of the main power supply mode transformer substation is tripped; and simultaneously, sending a GOOSE signal to a standby mode transformer substation connected through the connecting wire so as to lock the standby automatic switching of the connecting wire of the standby mode transformer substation, and locking the reclosing of the line-incoming circuit breaker of the connecting wire of the main mode transformer substation through the GOOSE signal.
When the main transformer circuit breaker of the standby mode transformer substation is in the combined position and fails to protect the action, or the main transformer circuit breaker of the separated position is in the dead zone protecting action, the contact line incoming circuit breaker of the standby mode transformer substation is tripped; and simultaneously, a GOOSE signal is sent out to lock the local station to close the non-tie line incoming circuit breaker of the ready-to-supply mode transformer substation.
With the drawings 1 and 2, when the main transformer has a failure fault or a dead zone fault, the operation mode of the transformer substation is judged, when the operation mode is a main supply mode and a contact line 1# inlet wire is jumped, a 2# inlet wire breaker is jumped, when the operation mode is a standby supply mode and a contact line 1# inlet wire is jumped, a contact line 1# inlet wire breaker is jumped, when the operation mode is a main supply mode and a contact line 2# inlet wire is jumped, a 1# inlet wire breaker is jumped, and when the operation mode is a standby supply mode and a contact line 2# inlet wire is jumped, a contact line 2# inlet wire breaker is jumped.
When the operation mode of the substation is a main supply mode and a contact line 1# incoming line, locking a contact line spare power automatic switching of a neighboring station-i.e. a spare supply mode substation; when the operation mode of the substation is a standby mode and a connecting line 1# incoming line, closing the 2# incoming line of the substation; when the operation mode of the substation is a main supply mode and a contact line 2# incoming line, locking the contact line spare power automatic switching of the substation in a spare power supply mode of the adjacent station; and when the operation mode of the substation is the standby mode and the connecting line 2# incoming line, closing the 1# incoming line of the substation.
When the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
The application discloses a main transformer protection system based on an operation mode by utilizing a hand-in-hand power supply mode of the main transformer protection method.
And the substation operation mode judging module judges the operation mode of the substation according to the switching state of the two-way incoming line circuit breaker and the connecting line position pressing plate.
The substation operation mode comprises the following steps: a main supply mode, a connecting line 1# inlet wire, a standby supply mode, a connecting line 1# inlet wire, a main supply mode, a connecting line 2# inlet wire and a standby supply mode, and a connecting line 2# inlet wire;
The main supply mode is that two line-incoming circuit breakers of a transformer substation are in a combined position and are connected with a standby supply mode transformer substation through a connecting line, and the standby supply mode is that the connecting line-incoming circuit breakers of the transformer substation are in a combined position and the non-connecting line-incoming circuit breakers are in a separated position.
The state judgment and protection control module of the main transformer circuit breaker automatically inputs corresponding main transformer protection functions according to the running state of the main transformer circuit breaker; when the state judgment and protection control module judges that the main transformer circuit breaker is in the closing position, the main transformer circuit breaker is put into failure protection;
and when the state judgment and protection control module judges that the main transformer circuit breaker is in the split state, the dead zone protection of the main transformer circuit breaker is put into.
When the main transformer circuit breaker fails or has dead zone faults, the incoming circuit breaker control module selectively breaks the incoming circuit breaker according to the operation mode of the transformer substation, removes faults, selectively locks the spare power automatic switching function of the corresponding transformer substation by using the GOOSE signal, and correctly locks reclosing protection and incoming closing.
The incoming line circuit breaker control module comprises an incoming line circuit breaker tripping selection unit and an incoming line circuit breaker latching selection unit;
The wire inlet breaker tripping unit is used for selectively tripping the wire inlet breaker according to the operation mode of the transformer substation and cutting off faults;
And the incoming line breaker selection locking unit is used for selectively locking the spare power automatic switching function of the corresponding transformer substation by utilizing the GOOSE signal according to the operation mode of the transformer substation after the incoming line breaker is tripped, and correctly locking reclosing protection and incoming line closing.
After the main transformer has a failure fault or a dead zone fault,
When the operation mode is a main supply mode and the connecting line 1# is in line, the line incoming breaker is a trip unit trip 2# line incoming breaker;
when the operation mode is the standby mode and the interconnection line 1# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 1# wire inlet circuit breaker;
When the operation mode is a main supply mode and the connecting line is 2# incoming line, the incoming line breaker is a trip unit trip 1# incoming line breaker;
when the operation mode is the standby mode and the interconnection line 2# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 2# wire inlet circuit breaker.
When the operation mode of the transformer substation is a main supply mode and a connecting line 1# incoming line is adopted, the incoming line breaker selects a locking unit to lock a connecting line spare power automatic switching of a transformer substation in a spare supply mode when a neighboring station is locked;
When the operation mode of the transformer substation is a standby mode and a connecting line 1# incoming line is connected, the incoming line breaker selects a locking unit to lock the 2# incoming line of the station to be closed;
When the operation mode of the transformer substation is a main supply mode and a connecting line 2# incoming line, the incoming line breaker selects a locking unit to lock a neighboring station, namely the automatic switching of the connecting line of the transformer substation in a standby supply mode;
When the operation mode of the transformer substation is the standby mode and the connecting line 2# incoming line is connected, the incoming line breaker selects the locking unit to lock the 1# incoming line of the station to be closed.
When the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
Description of the preferred embodiments
The invention will be further described with reference to the transformer substation a of fig. 1 and 2, and the transformer substation B of fig. 1 and 2 may be implemented with reference to the transformer substation a, since the main wiring is the same as that of the transformer substation a, and this patent is not described in any way. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of the present invention.
As shown in fig. 1, for the substation a, two cases of the main supply mode+the tie line 1# line and the backup supply mode+the tie line 1# line were studied.
Case 1: main power supply mode + tie line 1# inlet wire
When the No. 2 transformer is put into operation, at the moment, 2QF, 7QF and 8QF of the transformer substation A are combined, 1QF is separated, then 2QF failure protection and 1QF dead zone protection are automatically put into operation, when 2QF failure fault or 1QF dead zone fault occurs, at the moment, a power supply breaker of the transformer substation A, namely the No. 2 wire inlet breaker 8QF, is instantaneously tripped, and GOOSE signals are synchronously sent to blocking tie-line spare power switches of adjacent transformer substation B to prevent the transformer substation B from losing voltage to start 7QF and 8QF of the tie-line spare power switching transformer substation B, and meanwhile, the tie-line wire inlet breaker 7QF of the transformer substation A is blocked through the GOOSE signals to reclose.
Similarly, when the No. 1 transformer is put into operation, at the moment, 1QF, 7QF and 8QF of the transformer substation A are combined, 2QF is separated, 1QF failure protection is carried out, 2QF dead zone protection is automatically put into operation, when 1QF fails or 2QF fails, at the moment, a power supply breaker of the transformer substation A is instantaneously tripped, the 2# wire inlet breaker 8QF synchronously sends GOOSE signals to the blocking tie-line spare power switch of the adjacent transformer substation B, so that 7QF and 8QF of the tie-line spare power switch substation B are prevented from being started by the step-down of the transformer substation B, and meanwhile, 7QF reclosing of the tie-line wire inlet breaker of the transformer substation A is blocked by the GOOSE signals.
Case 2: standby mode + tie line 1# incoming line
When the No. 2 transformer is put into operation, 2QF and 7QF of the transformer substation A are at the same time separated, 1QF and 8QF are separated, then 2QF failure protection and 1QF dead zone protection are automatically put into operation, when 2QF failure fault or 1QF dead zone fault occurs, the power circuit breaker of the transformer substation A, namely the connecting line 1# incoming circuit breaker 7QF, is instantaneously tripped, GOOSE signals are synchronously sent to lock the standby power supply of the transformer substation A, namely 8QF for closing, and the connecting line incoming circuit breaker 7QF of the transformer substation A is not out of voltage, so that reclosing condition does not occur, and reclosing locking signals are not needed.
Similarly, if the No.1 transformer is put into operation, at the moment, the 1QF and 7QF of the transformer substation A are in position, the 2QF and 8QF are in position, then the 1QF failure protection and the 2QF dead zone protection are automatically put into operation, when the 1QF failure or the 2QF dead zone failure occurs, the power circuit breaker of the transformer substation A, namely the connecting line 1# incoming circuit breaker 7QF, is instantaneously tripped, and a GOOSE signal is synchronously sent to lock the standby power supply of the transformer substation A, namely the 8QF is closed, and the reclosing condition does not occur because the 7QF of the network circuit breaker of the transformer substation A is not out of voltage, so that a reclosing locking signal is not needed.
As shown in fig. 2, the two cases of the main supply mode + the tie line 2# incoming line and the backup supply mode + the tie line 2# incoming line are studied with the substation a as an implementation object.
Case 3: main power supply mode + tie line 2# incoming line
When the No. 2 transformer is put into operation, at the moment, 2QF, 7QF and 8QF of the transformer substation A are combined, 1QF is separated, then 2QF failure protection and 1QF dead zone protection are automatically put into operation, when 2QF failure fault or 1QF dead zone fault occurs, at the moment, a power supply breaker of the transformer substation A, namely a No. 1 wire inlet breaker 7QF, is instantaneously tripped, and GOOSE signals are synchronously sent to blocking tie-line spare power switches of adjacent transformer substation B to prevent the transformer substation B from losing voltage to start 7QF and 8QF of the tie-line spare power switching transformer substation B, and meanwhile, the tie-line wire inlet breaker 8QF of the transformer substation A is blocked through the GOOSE signals to reclose.
Similarly, when the No. 1 transformer is put into operation, at the moment, 1QF, 7QF and 8QF of the transformer substation A are combined, 2QF is separated, 1QF failure protection is carried out, 2QF dead zone protection is automatically put into operation, when 1QF fails or 2QF fails, the power circuit breaker of the transformer substation A is instantaneously tripped at the moment, the No. 1 wire inlet circuit breaker 7QF synchronously sends GOOSE signals to the blocking tie-line spare power switch of the adjacent transformer substation B to prevent the step-down starting of 7QF and 8QF of the tie-line spare power switch substation B of the transformer substation B, and meanwhile, the tie-line wire inlet circuit breaker 8QF of the transformer substation A is reclosed through the GOOSE signals.
Case 4: standby mode + tie line 2# incoming line
When the No. 2 transformer is put into operation, 2QF and 8QF of the transformer substation A are at the same time separated, 1QF and 7QF are separated, then 2QF failure protection and 1QF dead zone protection are automatically put into operation, when 2QF failure fault or 1QF dead zone fault occurs, the power circuit breaker of the transformer substation A, namely the connecting line 2# incoming circuit breaker 8QF, is instantaneously tripped, GOOSE signals are synchronously sent to lock the standby power supply of the transformer substation A, namely 7QF for closing, and the connecting line incoming circuit breaker 8QF of the transformer substation A is not out of voltage, so that reclosing condition does not occur, and reclosing locking signals are not needed.
Similarly, if the No. 1 transformer is put into operation, at this moment, the 1QF and 8QF of the transformer substation A are combined, the 2QF and 7QF are separated, then the failure protection of the 1QF and the dead zone protection of the 2QF are automatically put into operation, when the 1QF has failure fault or the 2QF has dead zone fault, the power circuit breaker of the transformer substation A, namely the connecting line 2# incoming circuit breaker 8QF, is instantaneously tripped, and a GOOSE signal is synchronously sent to lock the standby power supply of the transformer substation A, namely 7QF for closing, and the reclosing condition does not occur because the 8QF of the network circuit breaker of the transformer substation A is not out of voltage, so that a reclosing locking signal is not needed.
The present disclosure may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as SMALLTALK, C ++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (20)
1. The main transformer protection method based on the operation mode of the hand-in-hand power supply mode is characterized in that two line-in-line circuit breakers of a main power supply mode transformer substation are in a combined position and are connected with a standby power supply mode transformer substation through a connecting line, the connecting line-in-line circuit breakers of the standby power supply mode transformer substation are in the combined position, and the non-connecting line-in-line circuit breakers are in the separated position; characterized in that the method comprises the following steps:
according to the running state, a main transformer circuit breaker in the transformer substation automatically inputs a corresponding main transformer protection function;
When the main transformer has a failure fault or a dead zone fault, the line breaker is selectively tripped according to the operation mode of the transformer substation, and the fault is removed;
After the incoming line circuit breaker is tripped, the automatic backup power switching function of the corresponding transformer substation is selectively locked by utilizing the GOOSE signal according to the operation mode of the transformer substation, and reclosing protection and incoming line closing are correctly locked.
2. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 1, wherein the main transformer protection method is characterized in that:
The running state of the main transformer circuit breaker refers to two states that the main transformer circuit breaker is in a split state or the main transformer circuit breaker is in a combined state.
3. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 1, wherein the main transformer protection method is characterized in that:
when the main transformer circuit breaker is in the combination position, the main transformer circuit breaker is automatically put into failure protection;
when the main transformer circuit breaker is in the split position, the dead zone protection of the main transformer circuit breaker is automatically put into operation.
4. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 3, wherein the main transformer protection method is characterized in that:
When the main transformer circuit breaker generates a failure fault, the main transformer circuit breaker generates a failure protection action, wherein the failure fault refers to the failure fault when the main transformer circuit breaker is still in a closing position after the main transformer circuit breaker is tripped in the protection action, and the failure fault is generated;
when the main transformer circuit breaker generates a dead zone fault, the dead zone protection action is performed, wherein the dead zone fault refers to the situation that when a section of line between the main transformer circuit breaker and a corresponding current transformer in the direction of the power side fails, the current flowing through the current transformer is larger than a dead zone overcurrent fixed value, and the fault current keeping time exceeds the dead zone protection time limit, and then the dead zone fault occurs.
5. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 1, wherein the main transformer protection method is characterized in that:
The operation mode of the transformer substation comprises a combination of a power supply mode and a tie line position, wherein the power supply mode is divided into a main power supply mode and a standby power supply mode, and the tie line position is divided into a tie line 1# inlet wire and a tie line 2# inlet wire.
6. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 5, wherein the main transformer protection method is characterized in that:
When the main power supply mode transformer substation is in the failure protection action of the main power transformer circuit breaker at the combined position or in the dead zone protection action of the main power transformer circuit breaker at the separated position, the main power supply mode transformer substation is disconnected from the main power supply mode transformer substation, namely a non-connecting line incoming circuit breaker of the main power supply mode transformer substation; and simultaneously, sending a GOOSE signal to a neighboring station standby mode transformer station connected by the connecting wire so as to lock the standby power mode transformer station connecting wire standby automatic switching device, and locking the reclosing of the main power mode transformer station connecting wire breaker by the GOOSE signal.
7. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 6, wherein the main transformer protection method is characterized in that:
when the main transformer circuit breaker of the standby mode transformer substation is in the combined position and fails to protect the action, or the main transformer circuit breaker of the separated position is in the dead zone protecting action, the contact line incoming circuit breaker of the standby mode transformer substation is tripped; and simultaneously, a GOOSE signal is sent out to lock the local station to close the non-tie line incoming circuit breaker of the ready-to-supply mode transformer substation.
8. The main transformer protection method based on the operation mode for the hand-in-hand power supply mode according to claim 5, wherein the main transformer protection method is characterized in that:
the substation operation mode comprises the following steps:
Main supply mode + tie 1# inlet wire, standby supply mode + tie 1# inlet wire, main supply mode + tie 2# inlet wire, standby supply mode + tie 2# inlet wire.
9. The main transformer protection method based on the operation mode of the hand-in-hand power supply mode according to claim 8, wherein the main transformer protection method is characterized in that:
When the main transformer has failure or dead zone faults, the operation mode of the transformer substation is judged, when the operation mode is a main supply mode and a contact line 1# inlet wire, the contact line 1# inlet wire breaker is jumped, when the operation mode is a standby supply mode and a contact line 1# inlet wire, the contact line 1# inlet wire breaker is jumped, when the operation mode is a main supply mode and a contact line 2# inlet wire, the contact line 1# inlet wire breaker is jumped, and when the operation mode is a standby supply mode and a contact line 2# inlet wire, the contact line 2# inlet wire breaker is jumped.
10. The main transformer protection method based on the operation mode of the hand-in-hand power supply mode according to claim 9, wherein the main transformer protection method is characterized in that:
When the operation mode of the transformer substation is a main supply mode and a contact line 1# incoming line, locking a contact line spare power automatic switching of a neighboring station, namely a spare supply mode transformer substation; when the operation mode of the transformer substation is a standby mode and a connecting line 1# incoming line, closing the 2# incoming line of the transformer substation; when the operation mode of the transformer substation is a main supply mode and a contact line 2# incoming line, locking the contact line automatic switching of the transformer substation in a standby supply mode when the adjacent station is locked; and when the operation mode of the transformer substation is the standby mode and the connecting line 2# incoming line, closing the 1# incoming line of the station.
11. The main transformer protection method based on the operation mode of the hand-in-hand power supply mode according to claim 10, wherein the main transformer protection method is characterized in that:
when the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
12. A main transformer protection system based on an operation mode by using a hand-in-hand power supply mode of the main transformer protection method according to any one of claims 1-11, comprising a substation operation mode judging module, a main transformer breaker state judging and protecting control module and a line incoming breaker control module; the method is characterized in that:
The substation operation mode judging module judges the operation mode of the substation according to the switching state of the two-way incoming line circuit breaker and the connecting line position pressing plate;
the state judgment and protection control module of the main transformer circuit breaker automatically inputs corresponding main transformer protection functions according to the running state of the main transformer circuit breaker;
When the main transformer circuit breaker fails or has dead zone faults, the incoming circuit breaker control module selectively breaks the incoming circuit breaker according to the operation mode of the transformer substation, removes faults, selectively locks the spare power automatic switching function of the corresponding transformer substation by using the GOOSE signal, and correctly locks reclosing protection and incoming closing.
13. The main transformer protection system based on the operation mode of the hand-in-hand power supply mode according to claim 12, wherein:
The substation operation mode comprises the following steps: a main supply mode, a connecting line 1# inlet wire, a standby supply mode, a connecting line 1# inlet wire, a main supply mode, a connecting line 2# inlet wire and a standby supply mode, and a connecting line 2# inlet wire;
The main supply mode is that two line-incoming circuit breakers of a transformer substation are in a combined position and are connected with a standby supply mode transformer substation through a connecting line, and the standby supply mode is that the connecting line-incoming circuit breakers of the transformer substation are in a combined position and the non-connecting line-incoming circuit breakers are in a separated position.
14. The main transformer protection system based on the operation mode of the hand-in-hand power supply mode according to claim 13, wherein:
When the state judgment and protection control module of the main transformer circuit breaker judges that the main transformer circuit breaker is in the closing position, the main transformer circuit breaker is automatically put into failure protection;
and when the state judgment and protection control module judges that the main transformer circuit breaker is in the split state, the dead zone protection of the main transformer circuit breaker is automatically thrown in.
15. The main transformer protection system based on the operation mode of the hand-in-hand power supply mode according to claim 14, wherein:
The incoming line circuit breaker control module comprises an incoming line circuit breaker tripping selection unit and an incoming line circuit breaker latching selection unit;
The wire inlet breaker tripping unit is used for selectively tripping the wire inlet breaker according to the operation mode of the transformer substation and cutting off faults;
And the incoming line breaker selection locking unit is used for selectively locking the spare power automatic switching function of the corresponding transformer substation by utilizing the GOOSE signal according to the operation mode of the transformer substation after the incoming line breaker is tripped, and correctly locking reclosing protection and incoming line closing.
16. The main transformer protection system based on the operation mode according to claim 15, wherein:
After the main transformer has a failure fault or a dead zone fault,
When the operation mode is a main supply mode and the connecting line 1# is in line, the line incoming breaker is a trip unit trip 2# line incoming breaker;
when the operation mode is the standby mode and the interconnection line 1# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 1# wire inlet circuit breaker;
When the operation mode is a main supply mode and the connecting line is 2# incoming line, the incoming line breaker is a trip unit trip 1# incoming line breaker;
when the operation mode is the standby mode and the interconnection line 2# is in, the wire inlet circuit breaker selects the tripping unit to trip the interconnection line 2# wire inlet circuit breaker.
17. The main transformer protection system based on the operation mode according to claim 16, wherein:
When the operation mode of the transformer substation is a main supply mode and a connecting line 1# incoming line is adopted, the incoming line breaker selects a locking unit to lock a connecting line spare power automatic switching of a transformer substation in a spare supply mode when a neighboring station is locked;
When the operation mode of the transformer substation is a standby mode and a connecting line 1# incoming line is connected, the incoming line breaker selects a locking unit to lock the 2# incoming line of the station to be closed;
When the operation mode of the transformer substation is a main supply mode and a connecting line 2# incoming line, the incoming line breaker selects a locking unit to lock a neighboring station, namely the automatic switching of the connecting line of the transformer substation in a standby supply mode;
When the operation mode of the transformer substation is the standby mode and the connecting line 2# incoming line is connected, the incoming line breaker selects the locking unit to lock the 1# incoming line of the station to be closed.
18. The main transformer protection system based on the operation mode according to claim 17, wherein:
when the main supply mode transformer substation locks the spare power automatic switching of the adjacent station connecting line, the synchronous locking of the incoming line circuit breaker of the connecting line of the transformer substation is reclosed.
19. A computer system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of claims 1 to 11 when the computer program is executed by the processor.
20. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of claims 1 to 11.
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| CN202410368113.0A CN118213955A (en) | 2024-03-28 | 2024-03-28 | Main transformer protection method and system based on operation mode in hand-in-hand power supply mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410368113.0A CN118213955A (en) | 2024-03-28 | 2024-03-28 | Main transformer protection method and system based on operation mode in hand-in-hand power supply mode |
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