CN101478177B - Safe automatic control method suitable for transforming plant main transformer tripping - Google Patents
Safe automatic control method suitable for transforming plant main transformer tripping Download PDFInfo
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Abstract
The invention discloses a safety automatic control method suitable for a main transformer of a transformer station during the tripping process. The method is characterized in that on the transformer stations with three and more running main transformers, the buses at the high-voltage sides of the main transformers run in parallel, and the buses at the middle and low voltage sides of the main transformers run in parallel; after the electrical characteristics of the main transformers and the buses meet the charging conditions of spare power automatic switching, the spare power automatic switching is enabled, and if the main transformers trip at the moment through detection, the spare power automatic switching of the transformer station is realized according to the running modes of the main transformers and the bus-tie circuit breakers or the section switches at the medium-voltage sides or the low-voltage sides of the main transformers; and when the electrical characteristics of the main transformers and the buses meet the discharging conditions of spare power automatic switching, the spare power automatic switching of the transformer station is locked. The invention has the advantages that the method can effectively solve the problems of capacity release of the main transformers of the transformer station and the reliability of power supply of the transformer station during the process of trip fault of the main transformers.
Description
Technical field
The invention belongs to power automation technology control field, be particularly related to a kind of safe automatic control method that is applicable to the transformer station of three and three above main transformer operations, promptly after the tripping operation of operation main transformer, realize hauling oneself willingly into of power supply in particular by closing main transformer medium voltage side or low-pressure side bus connection switch or block switch.
Background technology
Along with continuous development economic and society, the user to the demand of electric power also in continuous growth, reliability requirement to power supply is also more and more higher simultaneously, therefore just require electric power system when improving constantly power supply reliability, constantly to increase the power transmission and distribution ability of transformer station, improve the power transmission and distribution ability at present two kinds of schemes are generally arranged: the one, newly-built electric substation, the 2nd, in the transformer station that has moved, increase an equipment for power transmission and distribution.And newly-built substation location difficulty, the transmission of electricity corridor is subjected to the influence of topography bigger, and expense is also higher, therefore improves the power transmission and distribution ability by increasing main transformer platform number and relevant equipment for power transmission and distribution in operation transformer station, and is both economical comparatively speaking feasible.Theoretically, main transformer platform number from one two increase to three so that more how after, the transmission capacity surface of primary equipment sees it is to have improved greatly, but whether system can safely and steadily run also will to consider to break down afterwards by main transformer from operational mode, therefore after increasing main transformer platform number, also there is certain problem, the one, load transfer is to remaining the serious overload that causes main transformer on the main transformer after faults such as one or more main transformer tripping operation, the 2nd, when mesolow side fanout operation, after if the main transformer on one section bus hinders full jumping for some reason, directly do not cause user's dead electricity if do not take to close bus connection switch measure meeting, therefore in actual moving process, newly-increased main transformer capacity is incomplete discharging also.
Below, the 220kV transformer station that moves with three main transformers is the example explanation, as shown in Figure 1, at present, the typical operation modes of three transformers operations transformer station of 220kV transformer station is as follows:
Normal operating mode: three main transformers move simultaneously, and 220kV bus bus connection switch is closing the position, are the paired running mode; 110kV bus bus connection switch is the fanout operation mode in a minute position; #1 main transformer, #3 main transformer run on the 220kV positive bus-bar in three main transformers, and the #2 main transformer runs on 220kV and pays bus.As a main transformer maintenance time, promptly two main transformer operational modes, this moment, 220kV bus connection switch and 110kV bus connection switch all closed the position, were the paired running mode.
The following problem of transformer station's ubiquity on operational mode of existing this many main transformer operations: 1) can not effectively solve three and three transforming plant main transformer power transformation capacity release problems that above main transformer moves; 2) can not effectively solve the overload and the load sharing problem of residue main transformer after the transforming plant main transformer fault of the above main transformer operation of three and three; 3) can not effectively solve the problem of the power supply reliability after the main transformer fault of the above main transformer operation of three and three transformer station.
And the stand-by power supply scheme of the transformer station of present three and three above main transformer operations is one-sided standby modes of two standby main transformers of main transformer, be that the positive female 110kV of being equipped with of 110kV pays the maternal formula, this mode course of action is as follows: after running on two main transformers of 220kV positive bus-bar and tripping simultaneously, the 110kV prepared auto restart is failure to actuate, the positive female decompression of 110kV causes user's power failure.When running on main transformer tripping operation of 220kV positive bus-bar, the 110kV prepared auto restart is failure to actuate, can cause remaining the serious overload of operation main transformer, to sum up this automatic closing scheme one is to bring loss to the user, the 2nd, can cause a power supply unit to resemble the badly damaged of main transformer etc., therefore must take certain measure, improve the 110kV standby power supply device, the power supply that comes the assurance system reliably to continue.
In view of the foregoing,,, guarantee the stability and the reliability of system, proposed a kind of safe automatic control method that adopts automatic closing in order further to improve the transmission of electric energy power of main transformer at the transformer station of three and three above main transformer operations.
Summary of the invention
Purpose of the present invention: for the transforming plant main transformer power transformation capacity that solves the above main transformer operation of three and three discharges the power supply reliability that the transformer station of problem and three and the operation of above transformer occurs and the overload problem of main transformer when the tripping operation fault takes place main transformer.
For this reason, of the present inventionly proposed a kind of transforming plant main transformer safe automatic control method in when tripping operation that is applicable to: in the transformer stations of three and three above main transformer operations, the main transformer high-voltage side bus is that paired running, main transformer mesolow side bus are fanout operation;
After the electrical characteristic of main transformer and bus satisfies the charge condition of automatic closing, open automatic closing, and if detected the main transformer tripping operation this moment, then close the bus connection switch or the block switch of main transformer medium voltage side or low-pressure side bus, realize the automatic closing of transformer station according to the operational mode of main transformer;
When the electrical characteristic that detects main transformer and bus satisfies the discharging condition of automatic closing, the automatic closing of locking transformer station.
Further, after female connection is closed in the action of main transformer tripping operation automatic closing, when the load transfer of tripping operation main transformer comes,, start the overload detection off-load to residue operation main transformer if main transformer high-pressure side power reaches overpower startup value; Start the back after if main transformer high-pressure side power reaches the overload operating value, through action delay, the connection that transships is cut, the medium voltage side of excision main transformer or low-pressure side load.
The charge condition of automatic closing method of the present invention:
1) main transformer medium voltage side or low-pressure side bus double-bus fanout operation or sectionalized single busbar connection operation;
2) main transformer high-pressure side positive bus-bar has the main transformer operation;
3) pay the main transformer high-pressure side the main transformer operation on the bus;
4) bus connection switch of main transformer medium voltage side or low-pressure side bus or block switch are in a minute position;
5) two of main transformer medium voltage side or low-pressure side sections buses all have pressure;
6) no any discharging condition satisfies.
7) through the automatic closing charging interval;
The discharging condition of automatic closing method of the present invention:
1) two sections buses of main transformer medium voltage side or low-pressure side all do not have pressure, discharge after discharge time;
2) two sections bus bus connection switches of main transformer medium voltage side or low-pressure side are closing the position, immediately discharge;
3) hand is jumped main transformer high-pressure side or mesolow side switch, immediately discharge;
4) receive locking automatic closing signal after, immediately the discharge;
5) withdraw from the hard pressing plate or the soft pressing plate of automatic closing function, immediately discharge;
Two sections buses of described main transformer medium voltage side or low-pressure side are the bus connection switch that will close after the automatic closing action or the bus at block switch place;
The course of action of automatic closing method of the present invention:
1) at positive bus-bar in more than two or two main transformer when operation, arranged, when detecting and a main transformer tripping operation only being arranged, through tripping operation time-delay, the medium voltage side of this main transformer of tripping or low-side switch, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side again;
2) when paying bus main transformer operation more than two or two arranged, when detecting and a main transformer tripping operation only being arranged, through tripping operation time-delay, the medium voltage side of this main transformer of tripping or low-side switch, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side again;
3) when detecting the main transformer that runs on positive bus-bar and all trip, through the tripping operation time-delay, tripping runs on the medium voltage side or the low-side switch of positive bus-bar main transformer, detect positive bus-bar voltage again and be lower than nothing pressure threshold, paying busbar voltage simultaneously is higher than the pressure threshold is arranged, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side;
4) when detecting when running on the main transformer of paying bus and all tripping, through the tripping operation time-delay, tripping runs on the medium voltage side or the low-side switch of paying the bus main transformer, detect a pair busbar voltage again and be lower than nothing pressure threshold, positive bus-bar voltage is higher than simultaneously the pressure threshold, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side.
So-called main transformer tripping operation be meant this main transformer uprise or become in electric parameters declare tripping operation and detect in the change or uprise any one TWJ and just be judged to main transformer and trip into 1.
Automatic closing action of the present invention back main transformer overload detection method:
After automatic closing closed bus connection switch or block switch, tripping operation main transformer load transfer came to remaining operation main transformer, if this moment, main transformer high-pressure side power reached overpower startup value, started the overload detection off-load; After main transformer high-pressure side power reached the overload operating value after overload started, and, excise the medium voltage side or the low-pressure side load of main transformer according to the pre-set cutting load of wanting, thereby eliminate the overload of main transformer through action delay.Herein, " main transformer high-pressure side power reaches overpower startup value " is the overpower entry condition, and " after main transformer high-pressure side power reaches the overload operating value, and through action delay " is overload connection and cuts operation condition.Wherein:
Overload overpower entry condition is:
In the following formula, i gets 1,2 ... n, Pi are every main transformer high-pressure side performance number, and Pzdqdi is the starting power definite value, and Tzdqdi is for starting the time-delay definite value, and t is a time counter;
Must satisfy the then starting element action of above 2 formulas simultaneously for residue operation main transformer.
The overload connection is cut operation condition and is:
In the following formula, i gets 1,2 ... n, Pi are every main transformer high-pressure side realtime power value, and Pizdj is an i main transformer j wheel overload operating value, and t is a time counter, and Tizdj is an i main transformer j wheel action delay definite value;
After starting for residue main transformer overload, must satisfy above 2 formulas simultaneously and the main transformer tripping operation is arranged and mesolow side bus connection switch when closing, the element that transships moves.
On the method for cutting load, by inverse time lag principle adjust action and time-delay definite value, the operating value that promptly transships is high more, the overload action delay is short more, cuts for fear of the mistake of load during the overload action, is divided into Pyatyi excision load according to different overload degree.
The invention has the beneficial effects as follows:
(1), can effectively solve the problem of the power supply reliability after release, load sharing problem and the main transformer fault of three and three above main transformer operation transforming plant main transformer power transformation capacity owing to adopted two functions that are equipped with of the stand-by power supply after the main transformer tripping operation fault;
(2), can effectively solve the overload problem of residue main transformer after the main transformer fault because overload detection and the Load Alleviation Function that also is provided with main transformer behind female connection or the block switch closed in main transformer standby power supply device action.
Description of drawings
Fig. 1 is existing a kind of 220kV transformer station three transformer operational modes structural representation;
Fig. 2 is the system configuration schematic diagram of an embodiment of the present invention;
Fig. 3 is the automatic switching device of standby power supply logic diagram of an embodiment of the present invention;
Fig. 4 cuts schematic diagram for the overload connection of an embodiment of the present invention.
Embodiment
Fig. 1 is the typical wiring mode sketch of the transformer station of present three main transformers operation, and 1# main transformer and 3# main transformer run on positive mother, and the 2# main transformer runs on pays mother; The 220kV bus connection switch is for closing the position, paired running; The 110kV bus connection switch is for dividing position, fanout operation.
Fig. 2 is the apparatus system configuration of automatic closing method embodiment, and implement device is main frame and slave distributed arrangement.Main frame carries out the computing of stand-by power supply scheme main body logic; Slave is mainly gathered the running status of main transformer, comprises that three-phase voltage, electric current, power and the throwing of main transformer high-pressure side, mesolow side stops and tripped condition, and carries out the tripping operation outlet order that main frame sends.Simultaneously, main frame is also supported the communication function with transformer station's information management system, is convenient to implement the ruuning situation of checkout gear.
Among the figure, analog quantity is input as the three-phase voltage and the electric current of main transformer high-pressure side, mesolow side; Switching value is input as the closing position signal contact or the trip position signal contact of the switch of main transformer high-pressure side, mesolow side; Switching value is output as tripping operation contact of jumping main transformer mesolow side switch and the combined floodgate contact that closes bus connection switch or block switch.
Fig. 3 is the automatic switching device of standby power supply logic diagram of automatic closing method embodiment.Symbol definition among the figure:
The highest phase voltage of U1:#1 main transformer medium voltage side;
The highest phase voltage of U2:#2 main transformer medium voltage side;
The highest phase voltage of U3:#3 main transformer medium voltage side;
Uwyzd: bus does not have the compression set value;
Uyyzd: bus has the compression set value;
Ttzd: the time-delay definite value of saltus step depressor medium voltage side switch;
Thzd: the time-delay definite value of closing the female connection of transformer medium voltage side;
STBBS: hand is jumped the throwing of not locking prepared auto restart function and is moved back control word;
Position, TWJx:x main transformer medium voltage side tripping operation back;
KKJ1, KKJ2, KKJ3 are position behind the combined floodgate of #1 main transformer, #2 main transformer, #3 main transformer;
Tbztcd: the charging interval of automatic closing;
Uqdzd: stand-by power supply low voltage starting definite value;
Ttzmc: the action connection point closing time that stand-by power supply is jumped main transformer medium voltage side switch or closed the female connection of main transformer medium voltage side;
Main transformer tripping operation: the high-pressure side of main transformer or the tripping operation of medium voltage side;
Main transformer trips simultaneously: the trip time of two main transformers is not more than 5 seconds at interval and then is judged to tripping operation simultaneously.
A. the charge condition of automatic closing is in this 220kV transformer station:
1) operation of #1 main transformer or #3 main transformer is in the change of #1 main transformer or #3 main transformer or uprises operation on the 220kV positive bus-bar;
2) 220kV pay on the bus operation of #2 main transformer be the #2 main transformer uprise or become in operation;
3) mother 110kV to be associated in the branch position be the female connection of 110kV TWJ=1;
4) two sections buses of 110kV have all that to press be U1 or U3 〉=Uyyzd and U2 〉=Uyyzd;
5) no stand-by power supply discharging condition described below satisfies;
6) through the prepared auto restart charging interval;
After above condition satisfied, the automatic switching device of standby power supply charging was finished, open automatic closing function.
B. the discharging condition of automatic closing is in this 220kV transformer station:
1) two sections buses of 110kV all do not have pressure, time-delay 15s discharge.
2) mother 110kV is associated in and closes discharge immediately behind the position;
3) the hand saltus step high or become in switch promptly device collect behind the combined floodgate of switch discharge immediately behind position KKJ1 or KKJ2 or the KKJ3=0;
4) other outside block signals discharge after resembling bus differential protecting, malfunctioning switch contact or main transformer backup protection action connection point immediately;
5) withdrawing from hard pressing plate of prepared auto restart function or soft pressing plate discharges immediately.
C. the course of action of automatic closing is in this 220kV transformer station:
1.1: three main transformers of mode all move, the 1# of positive female operation, 3# main transformer are when only having the tripping operation of #1 main transformer, the 110kV that device detects #2 main transformer operation pays busbar voltage and is higher than bus the compression set value is arranged, then through the medium voltage side switch of the time-delay definite value tripping # 1 of saltus step depressor medium voltage side switch main transformer, isolate accident point, when device collects the medium voltage side trip position of #1 main transformer, confirm the #1 main transformer become in after the tripping, close the 110kV bus connection switch through the time-delay of closing a floodgate again;
1.2: three main transformers of mode all move, the 1# of positive female operation, 3# main transformer are when only having the tripping operation of #3 main transformer, the 110kV that device detects #2 main transformer operation pays busbar voltage and is higher than bus the compression set value is arranged, then through the medium voltage side switch of the time-delay definite value tripping #3 of saltus step depressor medium voltage side switch main transformer, isolate accident point, when device collects the medium voltage side trip position of #3 main transformer, confirm the #3 main transformer become in after the tripping, close the 110kV bus connection switch through the time-delay of closing a floodgate again;
2: three main transformers of mode all move, the 1# of positive female operation, when the 3# main transformer trips simultaneously, the 110kV that device detects #2 main transformer operation pays busbar voltage and is higher than bus the compression set value is arranged, and the 110kV positive bus-bar is lower than bus does not have the compression set value, then through the time-delay definite value tripping # 1 of saltus step depressor medium voltage side switch and the medium voltage side switch of #3 main transformer, isolate accident point, collect the medium voltage side trip position of #1 and #3 main transformer when device, after the tripping, close the 110kV bus connection switch through the time-delay of closing a floodgate again in the change of affirmation # 1 and #3 main transformer;
3: three main transformers of mode all move, when paying the 2# main transformer lock of female operation, the 110kV that device detects #2 main transformer operation pays busbar voltage and is lower than bus and does not have the compression set value, and the 110kV positive bus-bar is lower than bus and is higher than bus the compression set value is arranged, then switch in the change of the time-delay definite value tripping 2# of saltus step depressor medium voltage side switch main transformer is isolated accident point, collects the medium voltage side trip position of #2 main transformer when device, during becoming, affirmation #2 main transformer after the tripping, closes the 110kV bus connection switch through the time-delay of closing a floodgate again.
Accompanying drawing 4 is cut the logic diagram of function for the overload connection of automatic closing method embodiment.
Transshipping with the #1 main transformer among the figure is that example describes, the differentiation logic of #2 main transformer overload changes P1 into P2, Pqdzd1 changes Pqdzd2 into, P1zd1, P2zd1, P3zd1, P4zd1, P5zd1 change P1zd2, P2zd2, P3zd2, P4zd2, P5zd2 into, T1zd1, T2zd1, T3zd1, T4zd1, T5zd1 change T1zd2, T2zd2, T3zd2, T4zd2, T5zd2 into, and the throwings at different levels of transshipping are moved back control word and changed #2 into and transship that control word is moved back in throwings at different levels, the action message changes #2 action messages at different levels into and gets final product.
The differentiation logic of #3 main transformer overload changes P1 into P3, Pqdzd1 changes Pqdzd3 into, P1zd1, P2zd1, P3zd1, P4zd1, P5zd1 change P1zd3, P2zd3, P3zd3, P4zd3, P5zd3 into, T1zd1, T2zd1, T3zd1, T4zd1, T5zd1 change T1zd3, T2zd3, T3zd3, T4zd3, T5zd3 into, and the throwings at different levels of transshipping are moved back control word and changed #3 into and transship that control word is moved back in throwings at different levels, the action message changes #3 action messages at different levels into and gets final product.
Among the figure:
The power that gather in real time P1:#1 main transformer high-pressure side
P1zd1:#1 main transformer overload one is taken turns the operating power definite value
T1zd1:#1 main transformer overload one is taken turns the action delay definite value
P2zd1:#1 main transformer overload two is taken turns the operating power definite value
T2zd1:#1 main transformer overload two is taken turns the action delay definite value
P3zd1:#1 main transformer overload three-wheel operating power definite value
T3zd1:#1 main transformer overload three-wheel action delay definite value
P4zd1:#1 main transformer overload four-wheel operating power definite value
T4zd1:#1 main transformer overload four-wheel action delay definite value
P5zd1:#1 main transformer overload five is taken turns the operating power definite value
T5zd1:#1 main transformer overload five is taken turns the action delay definite value
#1 change overload connection is cut one-level input～#1 change overload connection and cut the Pyatyi input: control word is moved back in the throwing of overload functions at different levels.
Main transformer overload overpower entry condition is:
In the following formula, i gets 1,2 ... n, Pi are every transformer high-voltage side performance number, and Pzdqdi is the starting power definite value, and Tzdqdi is for starting the time-delay definite value, and t is a time counter;
Must satisfy the then starting element action of above 2 formulas simultaneously for residue operation main transformer.
Main transformer overload connection is cut operation condition and is:
In the following formula, i gets 1,2 ... n, Pi are every transformer high-voltage side performance number, and Pizdj is an i main transformer j wheel overload operating value, and t is a time counter, and Tizdj is an i main transformer j wheel action delay definite value;
After starting for residue main transformer overload, must satisfy above 2 formulas simultaneously and main transformer tripping operation and bus connection switch TWJ=0 are arranged is that 110kV is that paired running then transships the element action, but loads according to pre-set cutting load circuit excision.
If the 110kV bus connection switch is in and closes the position when main transformer normally overhauls, automatic closing discharge this moment, the automatic closing function withdraws from, and has designed single female operation pressing plate in the example, and explanation 110kV paired running transships the TWJ that no longer detects the 110kV bus connection switch at this moment when dropping into this pressing plate.
For example: it is that 200MW, action delay are that 30S, action outlet definite value are for excising load 01 line and 07 line of loading that the power definite value is taken turns in #1 main transformer overload startup definite value 180MW, action one, after detecting the tripping operation of #3 main transformer, because #1 and #3 main transformer move on one section bus, #3 main transformer load is certain to transfer on the #1 main transformer, after the female connection of 110kV is closed in the automatic closing action, if #1 main transformer high-pressure side power during greater than 200MW the device overload start, start main transformer high-pressure side, back power continue 30S greater than 200MW after device overload action excision load 01 line and load 07 line.
Claims (8)
1. one kind is applicable to the safe automatic control method when transforming plant main transformer trips, and it is characterized in that: in the transformer stations of three and three above main transformer operations, the main transformer high-voltage side bus is that paired running, main transformer mesolow side bus are fanout operation; After the electrical characteristic of main transformer and bus satisfies the charge condition of automatic closing, open automatic closing, and if detected the main transformer tripping operation this moment, then close the bus connection switch or the block switch of main transformer medium voltage side or main transformer low-pressure side bus, realize the automatic closing of transformer station according to the operational mode of main transformer; When the electrical characteristic that detects main transformer and bus satisfies the discharging condition of automatic closing, the automatic closing of locking transformer station.
2. safe automatic control method according to claim 1 is characterized in that the charge condition of described automatic closing is:
1) operation of main transformer medium voltage side or low-pressure side bus double-bus or sectionalized single busbar connection operation;
2) main transformer high-pressure side positive bus-bar has the main transformer operation;
3) pay the main transformer high-pressure side the main transformer operation on the bus;
4) bus connection switch of main transformer medium voltage side or low-pressure side bus or block switch are in a minute position;
5) two of main transformer medium voltage side or low-pressure side sections buses all have pressure;
6) through the automatic closing charging interval.
3. safe automatic control method according to claim 1 is characterized in that the discharging condition of described automatic closing is:
1) two sections buses of main transformer medium voltage side or low-pressure side all do not have pressure, discharge after discharge time;
2) two sections bus bus connection switches of main transformer medium voltage side or low-pressure side are closing the position, immediately discharge;
3) hand is jumped main transformer high-pressure side or mesolow side switch, immediately discharge;
4) receive locking automatic closing signal after, immediately the discharge;
5) withdraw from the hard pressing plate or the soft pressing plate of automatic closing function, immediately discharge;
The bus of described main transformer medium voltage side or low-pressure side is the bus that automatic closing will close bus connection switch or block switch.
4. safe automatic control method according to claim 1 is characterized in that, when all main transformers all move, and automatic closing charges, and described open automatic closing comprises the steps:
1) at positive bus-bar in more than two or two main transformer when operation, arranged, when detecting and a main transformer tripping operation only being arranged, through tripping operation time-delay, the medium voltage side of this main transformer of tripping or low-side switch, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side again;
2) when paying bus main transformer operation more than two or two arranged, when detecting and a main transformer tripping operation only being arranged, through tripping operation time-delay, the medium voltage side of this main transformer of tripping or low-side switch, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side again;
3) when detecting the main transformer that runs on positive bus-bar and all trip, through the tripping operation time-delay, tripping runs on the medium voltage side or the low-side switch of positive bus-bar main transformer, detect positive bus-bar voltage again and be lower than nothing pressure threshold, paying busbar voltage simultaneously is higher than the pressure threshold is arranged, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side;
4) when detecting when running on the main transformer of paying bus and all tripping, through the tripping operation time-delay, tripping runs on the medium voltage side or the low-side switch of paying the bus main transformer, detect a pair busbar voltage again and be lower than nothing pressure threshold, positive bus-bar voltage is higher than simultaneously the pressure threshold, through the time-delay of closing a floodgate, close the medium voltage side of main transformer or the bus connection switch or the block switch of two sections buses of low-pressure side.
5. according to each described safe automatic control method of claim 1 to 4, it is characterized in that, after automatic closing closes bus connection switch or block switch, when tripping operation main transformer load transfer comes to remaining operation main transformer: when main transformer high-pressure side power satisfies the overpower entry condition, start the overload detection off-load; After power satisfied overload connection in main transformer high-pressure side is cut operation condition, the medium voltage side of excision main transformer or low-pressure side load.
6. safe automatic control method according to claim 5 is characterized in that, described overpower entry condition is:
|Pi|≥Pzdqdi
t≥Tzdqdi
In the following formula, i gets 1,2 ... n, Pi are every main transformer high-pressure side performance number, and Pzdqdi is an overpower startup value, and Tzdqdi is for starting the time-delay definite value, and t is a time counter;
Must satisfy the then starting element action of above 2 formulas simultaneously for residue operation main transformer, start the overload detection Load Alleviation Function.
7. safe automatic control method according to claim 5 is characterized in that, described overload connection is cut operation condition and is:
|Pi|≥Pjzdi
t≥Tjzdi
In the following formula, i gets 1,2 ... n, Pi are every main transformer high-pressure side performance number, and Pjzdi is an i main transformer j wheel operating power value, and t is a time counter, and Tjzdi is an i main transformer j wheel action delay definite value;
After starting for residue main transformer overload, must satisfy above 2 formulas simultaneously and the main transformer tripping operation be arranged and mesolow side bus connection switch then transships the element action when closing, excise the medium voltage side or the low-pressure side of main transformer and load.
8. safe automatic control method according to claim 7 is characterized in that, described overload connection is cut action branch Pyatyi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100953321A CN101478177B (en) | 2009-01-08 | 2009-01-08 | Safe automatic control method suitable for transforming plant main transformer tripping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100953321A CN101478177B (en) | 2009-01-08 | 2009-01-08 | Safe automatic control method suitable for transforming plant main transformer tripping |
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| CN102593861B (en) * | 2012-01-19 | 2014-06-11 | 山东科汇电力自动化股份有限公司 | Intelligent comprehensive control method for distribution transformers |
| CN103326460A (en) * | 2012-03-23 | 2013-09-25 | 鹤岗电业局 | Remote stability control method and device |
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| CN103490502B (en) * | 2013-08-23 | 2015-05-13 | 湖南骏泰浆纸有限责任公司 | Control method for intelligent automatic bus transfer equipment |
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| CN104730957B (en) * | 2015-03-16 | 2017-07-18 | 国网山西省电力公司电力科学研究院 | The Direct Recognition system for state of moving back is thrown in the differential protection of intelligent substation transmission line of electricity |
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| CN107508278B (en) * | 2017-08-02 | 2021-01-19 | 国网上海市电力公司 | Backup power switching method without line voltage |
| CN112467703B (en) * | 2020-11-16 | 2024-02-09 | 国网河南省电力公司焦作供电公司 | Bus-tie dead zone protection device suitable for 110 kilovolt network characteristics |
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Inventor after: Ying Kang Inventor after: Yang Yijun Inventor after: Huang Wuhao Inventor after: Ling Fang Inventor after: Xu Xianghai Inventor after: Xia Shangxue Inventor before: Ying Kang Inventor before: Yang Yijun Inventor before: Huang Wuhao Inventor before: Ling Fang Inventor before: Xu Xianghai |
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Effective date of registration: 20130114 Address after: 310009 No. 219, Jianguo Middle Road, Hangzhou, Zhejiang Patentee after: Hangzhou Electric Power Bureau Patentee after: State Grid Corporation of China Address before: 310009 No. 219, Jianguo Middle Road, Hangzhou, Zhejiang Patentee before: Hangzhou Electric Power Bureau |