CN109861180A - Anti- section switch dead-zone fault bus differential protection is latched prepared auto restart guard method - Google Patents
Anti- section switch dead-zone fault bus differential protection is latched prepared auto restart guard method Download PDFInfo
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Abstract
The invention discloses a kind of anti-section switch dead-zone fault bus differential protections to be latched prepared auto restart guard method; solve the prior art either I section of bus-bar fault or II section of bus-bar fault; it is latched prepared auto restart, i.e., no the technical issues of using blocking scheme, whole station is be easy to cause all to have a power failure.The present invention can correctly act locking prepared auto restart movement using the scheme of electric substation 110kV bus differential protection locking prepared auto restart under the various methods of operation, when each 110kV bus-bar fault and close a floodgate; it prevents prepared auto restart accidentally from throwing on faulty equipment, is conducive to power network safety operation.In segmentation (mother) dead-zone fault, 110kV bus differential protection can precision maneuver, cut off failure.The present invention can accidentally can not be closed a floodgate under the various methods of operation when 110kV outlet failure using the scheme of electric substation 110kV bus differential protection locking prepared auto restart, improve power grid power supply reliability in the movement of locking prepared auto restart.
Description
Technical field
The present invention relates to a kind of anti-section switch dead-zone fault bus differential protections to be latched prepared auto restart guard method, belongs to electric power
Transmission and distribution networks control technology field.
Background technique
The side 110kV single-trunk segmental wiring electric substation 110kV at present, protection blocking 110kV alternate power autocast dress
Setting (abbreviation prepared auto restart) has 2 kinds of methods: (1) being protected using 110kV electric power incoming line；(2) 110kV bus differential protecting is used.
110kV is had the following problems using incoming relay-protection locking 110kV prepared auto restart scheme: 1, for I section of bus of 110kV or 110kV II
When section bus has outlet route, in outlet line failure, the protection protection of 110kV electric power incoming line can not judge it is 110kV
Line fault or 110kV bus-bar fault；2, it when two bus operations of electric power incoming line band all the way, breaks down in any bus
In the case of 110kV electric power incoming line protection can not judge II section of bus-bar fault of I section of bus-bar fault of 110kV or 110kV；Above-mentioned two
A problem is that 110kV electric power incoming line protection blocking 110kV prepared auto restart has more insoluble problem.Using 110kV bus
Differential protection is latched 110kV prepared auto restart scheme as 110kV bus protection and has the following problems: according to Q/GDW 10767-
2015 regulations realize locking prepared auto restart using 110kV bus differential protection, only export 1 pair of tripping contact to prepared auto restart.This is done so that
The 110kV prepared auto restart scheme of 110kV bus differential protecting locking at present exists: either I section of bus-bar fault or II section of bus event
Barrier, has been latched prepared auto restart, i.e., without using blocking scheme, whole station is be easy to cause all to have a power failure.The present invention will propose one
Kind is standby certainly for the 110kV bus differential protection locking of the 110kV single-trunk segmental wiring of the anti-section switch dead-zone fault of electric substation
The Protection Technology scheme of throwing.
Summary of the invention
The purpose of the present invention is to provide a kind of anti-section switch dead-zone fault bus differential protections to be latched prepared auto restart protection side
Method solves the prior art either I section of bus-bar fault or II section of bus-bar fault, has been latched prepared auto restart, i.e. not use pair
The technical issues of answering lock-out scheme, whole station be easy to cause all to have a power failure.
The purpose of the present invention is achieved by the following technical programs:
A kind of anti-section switch dead-zone fault bus differential protection locking prepared auto restart guard method, comprising:
1. bus differential protection action jumps I section of bus breaker and is latched the control that No. 1 power circuit breaker closes a floodgate simultaneously are as follows:
1.1 barring conditions 1
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of I section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
1.2 barring conditions 2
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of I section of bus of the 110kV without segmented current；
(3) the big differential relay movement of the female difference of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
1.3 barring conditions 3
1.3.1 exporting T time clearing signal
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
When above-mentioned (1)-(3) condition whole satisfaction, T time clearing signal is exported；
1.3.2 barring condition:
(1) when (1)-(3) condition either condition of above-mentioned 1.3.1 is unsatisfactory for, i.e. the female poor II section of bus of 110kV it is small it is differential after
Electric appliance or 110kV II section of bus composite voltage element of female big differential relay or 110kV of difference, become returning from acting originally；
(2) there is output T time clearing signal；
(3) when section switch becomes open position from closing position；
(4) the small differential relay of the female poor II section of bus of the 110kV without segmented current is not operating；
(5) I section of bus compound voltage lockout of 110kV is open；
(6) the big differential relay movement of the female difference of 110kV；
(7) the phase current element for being segmented CT is more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, after delay t1 delay, bus differential protection action is jumped I section of bus breaker and is latched simultaneously
No. 1 power circuit breaker closes a floodgate；
1.3 barring conditions 4
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) prepared auto restart starts No. 1 electric power incoming line breaker 1DL and closes a floodgate；
(4) No. 1 electric power incoming line breaker 1DL become closing position from open position；
(5) No. 1 electric power incoming line phase current elements are more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker simultaneously
It closes a floodgate；
2. bus differential protection action jumps II section of bus breaker and is latched the control that No. 2 power circuit breakers close a floodgate simultaneously are as follows:
2.1 barring conditions 1
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 2 power circuit breakers conjunctions simultaneously
Lock；
2.2 barring conditions 2
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV without segmented current；
(3) the big differential relay movement of the female difference of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 2 power circuit breakers conjunctions simultaneously
Lock；
2.3 barring conditions 3
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) prepared auto restart starts No. 2 electric power incoming line breaker 2DL and closes a floodgate；
(4) No. 2 electric power incoming line breaker 2DL become closing position from open position；
(5) No. 2 electric power incoming line phase current elements are more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker simultaneously
It closes a floodgate；
3. bus differential protection action is latched the control that section switch closes a floodgate are as follows:
3.1 barring conditions 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) the female poor small differential relay movement of I section of bus of the 110kV containing segmented current；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
3.2 barring conditions 2:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
3.3 barring conditions 3:
(1) the big differential relay movement of the female difference of 110kV；
(2) I section of bus compound voltage lockout of 110kV is open or II section of bus compound voltage lockout of 110kV is open；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously.
The purpose of the present invention can also be further realized by following technical measures:
Aforementioned anti-section switch dead-zone fault bus differential protection is latched prepared auto restart guard method, wherein output open hour T
Take 200-300 milliseconds；T1 takes 20-40 milliseconds.
Aforementioned anti-section switch dead-zone fault bus differential protection is latched prepared auto restart guard method, correlation in barring condition 1,2
The adjusting and requirement of protection are as follows:
1. in barring condition 1,2, the phase current element definite value of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines is by escaping
The maximum for flowing through this protection in this electric substation or 110kV outlet route in electric substation's maximum transformer, when low-voltage bus bar short circuit is short
Road current calibration:
(1) in formula,Most for electric substation in this electric substation under system maximum operational mode or 110kV outlet route
The maximum short circuit current of this protection, K are flowed through in big transformer, when low-voltage bus bar short circuitkFor safety factor, 1.3-1.5 is taken；
The zero-sequence current component definite value of segmentation or No. 1 electric power incoming line presses the small mode 110kV bus singlephase earth fault of system
There is >=1.5 times of sensitivity adjusting:
(2) in formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, takes 1.5；
2. the phase current that the phase current element of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines takes A phase, B phase, C phase；
The phase current element and zero-sequence current component requirement band directional element of No. 3.1 electric power incoming lines or No. 2 electric power incoming lines, side
It is directed toward to element: bus is directed toward by route.
Aforementioned anti-section switch dead-zone fault bus differential protection is latched prepared auto restart guard method, higher level substation power supply side line
Road relaying configuration and adjusting require as follows:
1. higher level substation source side route protection configuration requirement
Power circuit configuration fibre-optic current differential protection, I section~III section of phase spacing protection and the ground connection of higher level substation
I section~III section of distance protection, I section~III section of zero-sequence current protection and reclosing；
When the power circuit is≤short-term road of 5km when, the power circuit of higher level substation must configure and adjust optical fiber
Current differential protection.
2. the adjusting of higher level substation source side route protection requires
It wherein deactivates for I section of zero-sequence current, I section of phase spacing protection, I section of ground distance and II section of phase spacing protection connect
The adjusting of II section of ground distance, II section of zero-sequence current requires as follows:
(1) I section of phase spacing, I section of ground distance protection
It is adjusted by this line end failure is escaped:
Zzd≤KKZL (3)
(3) K in formulaKFor safety factor, 0.7~0.8 is taken；
I section of phase spacing, I section of the ground distance delay protected are 0s；
When the power circuit is≤short-term road of 5km when, I section of phase spacing, I section of ground distance protection can not whole stopping at fixed time
With defencive function is served as by the fibre-optic current differential protection of configuration complete fibre function；
(2) II section of phase spacing, II section of ground distance protection
By escape on this electric substation or 110kV outlet route in electric substation's maximum transformer, low-voltage bus bar short circuit Shi Benbao
The minimum measurement impedance setting of shield:
Zzd≤KKZL+KKbZb (4)
(4) K in formulaK、KKbFor safety factor, 0.7~0.8, Z is takenLFor line impedance, ZbFor transformer impedance；
II section of phase spacing, II section of the ground distance delay protected are 0.3s；
(3) II section of zero-sequence current
There is enough sensitivity to adjust by this line end failure:
(5) in formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, takes 1.5；
The delay of II section of zero-sequence current protection is 0.3s；
It is adjusted by above-mentioned requirements, I section of phase spacing protection and I section of ground distance of protection protection scope are route route
70%~80%, II section of phase spacing protection, II section of ground distance protection, II section of zero-sequence current of protection scope are that this route is complete
Portion, and the high-voltage winding part of junior's route or main transformer is protruded into, it is delayed as 0.3s.
Compared with prior art, the beneficial effects of the present invention are: the present invention is standby using the locking of electric substation 110kV bus differential protection
Locking prepared auto restart movement can be correctly acted when can be under the various methods of operation, each 110kV bus-bar fault from the scheme of throwing
It closes a floodgate, prevents prepared auto restart accidentally from throwing on faulty equipment, be conducive to power network safety operation.In segmentation (mother) dead-zone fault
When, 110kV bus differential protection can precision maneuver, cut off failure.The present invention is latched prepared auto restart using electric substation 110kV bus differential protection
Scheme can under the various methods of operation when 110kV outlet failure, can not accidentally locking prepared auto restart movement close a floodgate, improve electricity
Net power supply reliability.The present invention is latched the scheme of prepared auto restart using electric substation 110kV bus differential protection, and logic is simple and easy.This hair
Bright scheme is useful in: (1) there was only that the female poor branch of two power supplys has power supply and outlet branch, transformer branch do not have power supply；(2) two electricity
The female poor branch in source has power supply, and outlet branch, transformer branch also have power supply.
Detailed description of the invention
Fig. 1 is that 110kV bus differential protecting is latched prepared auto restart schematic diagram；
Fig. 2 is 110kV electric substation sectionalized single busbar connection primary connection circuit figure；
Fig. 3 is 220kV electric substation 110kV double-bus (sectionalized single busbar connection) primary connection circuit figure；
Symbol description is as follows in Fig. 1:
Indicate logical AND relationship, i.e., when input condition all meets, output is effective；
Indicate logic or relationship, i.e., input condition is any when meeting, and output is effective；
It is expressed as opposite with input signal；
Indicate 300ms pulse output.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Figure 1,110kV bus differential protecting is latched prepared auto restart schematic diagram.
As shown in Fig. 2, transmission and distribution networks applied by method of the invention are electric substation's sectionalized single busbar connection primary connection circuit
Grid.It include: No. 1 power supply female poor spacing devices, No. 2 power supplys in the 110kV system primary connection circuit of the transmission and distribution networks
Female difference spacing devices are separately connected II section of I section of bus of 110kV, 110kV bus；Have between I section of bus of 110kV and II section of bus point
Section breaker 3DL, and it is serially connected with segmented current mutual inductor (hereinafter referred to as CT)；No. 1 power supply female poor spacing devices, No. 2 power supply mothers
Poor spacing devices have female poor breaker 1DL, 2DL, and are serially connected with CT1, CT2；In addition, I section of bus of 110kV and II section of bus are connected to
110kV bus-bar potential transformer, I section of bus of 110kV are further connected with No. 1 transformer branch, No. 2 transformer branches, No. 1 110kV and go out
Line branch and 110kV voltage transformer (hereinafter referred to as PT) and 110kV bus arrester；II section of bus of 110kV is further connected with No. 3 changes
Depressor branch, No. 2 110kV outlet branches and 110kV PT2 and 110kV bus arrester.
It is once main that method of the invention applies also for the 110kV of 220kV electric substation shown in Fig. 3 double-bus (sectionalized single busbar connection)
Wiring.
For above-mentioned 110kV sectionalized single busbar connection primary connection circuit, it is configured with 110kV bus differential protecting, how to be realized
110kV bus differential protecting is to the bus-bar fault lock-out scheme of 110kV prepared auto restart, to meet live service requirement.Based on this, originally
Invention provides anti-section switch dead-zone fault 110kV bus differential protection locking prepared auto restart guard method.
The embodiment (by taking Fig. 2 as an example) of the method for the present invention is given below:
1, No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL operations, section switch 3DL stand-by heat
1.1 I section of 110kV bus-bar faults
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL operations, section switch 3DL stand-by heat are segmented
Breaker 3DL open position.When I section of bus-bar fault of 110kV, due in II section of protection scope of higher level's power circuit distance,
So II section of the power circuit distance protection of higher level No. 2 starts, could be acted after 0.3s；Simultaneously when I section of bus-bar fault of 110kV,
(segmented current is exited I in open position, female difference to small differential relay of the I section of bus of 110kV without segmented current by segmentation
Section bus small difference element differential current computing), I section of big differential relay starting of the female difference of 110kV, 110kV bus compound voltage lockout
Condition is open, i.e., bus differential protection action jumps breaker on I section of bus and is latched section switch 3DL combined floodgate simultaneously.
When I section of bus-bar fault of 110kV, I section of big differential relay starting of the female difference of 110kV, 110kV bus compound electric are pressed off
Bolt part is open, i.e., bus differential protection action locking section switch 3DL closes a floodgate.
1.2 II section of 110kV bus-bar faults
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL operations, section switch 3DL stand-by heat are segmented
Breaker 3DL open position.When II section of bus-bar fault of 110kV, due to starting in the II section of protection of higher level's power circuit distance,
It could be acted after 0.3s；Simultaneously when II section of bus-bar fault of 110kV, II section of bus of 110kV without segmented current it is small it is differential after
Electric appliance (segmented current is exited the small difference element differential current computing of II section of bus in open position, female difference by segmentation), 110kV are female
II section of poor big differential relay starting, 110kV bus compound voltage lockout condition are open, i.e., bus differential protection action jumps II section of bus
Upper breaker is latched section switch 3DL combined floodgate simultaneously.
When II section of bus-bar fault of 110kV, II section of big differential relay starting of the female difference of 110kV, 110kV bus composite voltage
Barring condition is open, i.e., bus differential protection action locking section switch 3DL closes a floodgate.
Outlet line fault on 1.3 I section of 110kV buses
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL operations, section switch 3DL stand-by heat are segmented
Breaker 3DL open position.When outlet route (or transformer) failure on I section of bus of 110kV, corresponding protection starting is jumped
Lock, and the big differential relay of 110kV bus differential protection is reflected as external area error so not will start, therefore 110 will not be latched for certainly
It throws.
Outlet line fault on 1.4 II section of 110kV buses
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breakers run 2DL, section switch 3DL stand-by heat is segmented
Breaker 3DL open position.When outlet route (or transformer) failure on II section of bus of 110kV, corresponding protection starting is jumped
Lock, and the big differential relay of 110kV bus differential protection is reflected as external area error so not will start, therefore 110 will not be latched for certainly
It throws.
It breaks down between 1.5 section switches and segmentation CT
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL operations, section switch 3DL stand-by heat are segmented
Breaker 3DL open position.It breaks down when between section switch 3DL and segmentation CT, since segmentation CT is located at I section of 110kV
Bus bar side is equivalent to I section of bus-bar fault of 110kV, since bus differential protection has differentiation section switch 3DL in open position, certainly
It is dynamic that segmented current is not involved in I section of bus of 110kV or the small difference element spill current calculating of II section of bus of 110kV, so 110kV I
Small differential relay, 110kV female difference greatly differential relay starting, 110kV I section bus compound electric of the section bus without segmented current
Press barring condition open, I section of bus bus differential protection action of 110kV jumps breaker on I section of bus and be latched section switch conjunction simultaneously
Lock guarantees the power supply of II section of bus of 110kV.
When I section of bus-bar fault of 110kV, I section of big differential relay starting of the female difference of 110kV, 110kV bus compound electric are pressed off
Bolt part is open, i.e., bus differential protection action locking section switch 3DL closes a floodgate.
2, No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker 2DL stand-by heats
2.1 I section of 110kV bus-bar faults
Because No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker 2DL stand-by heats, i.e. No. 2 electricity
Source breaker 2DL open position.When I section of bus-bar fault of 110kV, due in II section of protection scope of higher level's power circuit distance
It is interior, so II section of the power circuit distance protection of higher level No. 1 starts, could be acted after 0.3s；Work as I section of bus-bar fault of 110kV simultaneously
When, small differential relay, 110kV female difference greatly differential relay starting, 110kV I section mother of the I section of bus of 110kV containing segmented current
Line compound voltage lockout condition is open, and bus differential protection action jumps breaker and 110kV section switch on I section of bus of 110kV
3DL；In the case due to female difference, it is not latched the closing circuit of No. 2 power circuit breakers of prepared auto restart, so, prepared auto restart is still
It will start No. 2 power circuit breaker 2DL to close a floodgate, II section of bus load prepared auto restart of 110kV made to power to No. 2 electric power incoming lines.
2.2 II section of 110kV bus-bar faults
Because No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker 2DL stand-by heats, i.e. No. 2 electricity
Source breaker 2DL open position.When II section of bus-bar fault of 110kV, small differential relay of the II section of bus of 110kV containing segmented current
II section of big differential relay starting of the female difference of device, 110kV, 110kV bus compound voltage lockout condition are open, II section of bus of 110kV
Bus differential protection action jumps breaker and 110kV section switch on II section of bus of 110kV, ensure that the confession of I section of bus of 110kV
Electricity；Due to the bus differential protection action of II section of bus of 110kV, so the closing circuit of locking No. 2 power circuit breakers of prepared auto restart, institute
With prepared auto restart not will start No. 2 power circuit breaker 2DL and close a floodgate.
Outlet line fault on 2.3 I section of 110kV buses
Because No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker 2DL stand-by heats, i.e. No. 2 electricity
Source breaker 2DL open position.When outlet route (or transformer) failure on I section of bus of 110kV, corresponding protection starting is jumped
Lock, and the big differential relay of 110kV bus differential protection is reflected as that external area error is all not to be will start, thus will not be latched 110 it is standby from
It throws.
Outlet line fault on 2.4 II section of 110kV buses
Because No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power supplys
Breaker 2DL open position.When outlet route (or transformer) failure on II section of bus of 110kV, corresponding protection starting is jumped
Lock, and the big differential relay of 110kV bus differential protection is reflected as that external area error is all not to be will start, thus will not be latched 110 it is standby from
It throws.
It breaks down between 2.5 section switch 3DL and segmentation CT
Because No. 1 power circuit breaker 1DL, section switch 3DL are run, No. 2 power circuit breaker 2DL stand-by heats, i.e. No. 2 electricity
Source breaker 2DL open position.It breaks down when between section switch 3DL and segmentation CT, since segmentation CT is located at 110kV I
Section bus bar side, is equivalent to II section of bus-bar fault of 110kV, due in II section of protection scope of higher level's power circuit distance, or more
II section of the power circuit distance protection of grade 1 starts, and could act after 0.3s；II section of bus of 110kV is containing the small of segmented current simultaneously
II section of big differential relay starting of the female difference of differential relay, 110kV, 110kV bus compound voltage lockout condition are open, and female difference is protected
Breaker and 110kV section switch on II section of bus of 110kV are jumped in shield movement；Since the bus differential protection of II section of bus of 110kV is dynamic
Make, so the closing circuit of locking No. 2 power circuit breakers of prepared auto restart, so, prepared auto restart not will start No. 2 power circuit breaker 2DL
It closes a floodgate.
After 110kV section switch tripping, become I section of bus-bar fault of 110kV, I section of bus of 110kV is without segmented current
I section of big differential relay starting of the female difference of small differential relay, 110kV, 110kV bus compound voltage lockout condition are open, female poor
I section of bus breaker of protection act tripping 110kV cuts off failure.
Or after II section of bus differential protection starting of 110kV, T time clearing signal is on the one hand exported, on the other hand starting segmentation is disconnected
Road device 3DL tripping, after section switch 3DL tripping, section switch 3DL becomes open position from closing position, and II section of 110kV
The II section of bus compound voltage lockout element of small differential relay, 110kV of bus containing segmented current becomes returning from acting,
II section of bus of 110kV is free of the small differential relay akinesia of segmented current, and the big differential relay of the female difference of 110kV still opens
Dynamic, segmentation phase current element movement or zero-sequence current component movement, I section of bus compound voltage lockout condition of 110kV open this
After several conditions are all satisfied, it is delayed after t1, breaker on I section of bus of bus differential protection action tripping 110kV.
At this point, whole station loses power supply.
3, No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat
3.1 I section of 110kV bus-bar faults
Because No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, i.e. No. 1 electricity
Source breaker 1DL open position.When I section of bus-bar fault of 110kV, due in II section of protection scope of higher level's power circuit distance
It is interior, so II section of the power circuit distance protection of higher level No. 2 starts, could be acted after 0.3s；Work as I section of bus-bar fault of 110kV simultaneously
When, small differential relay, 110kV female difference greatly differential relay starting, 110kV I section mother of the I section of bus of 110kV containing segmented current
Line compound voltage lockout condition is open, and I section of bus bus differential protection action of 110kV jumps breaker and 110kV on I section of bus of 110kV
Section switch 3DL ensure that the power supply of II section of bus of 110kV；After 110kV section switch 3DL tripping, due to I section of 110kV
Bus bus differential protection action has been latched the combined floodgate that prepared auto restart starts No. 1 power circuit breaker 1DL.
3.2 II section of 110kV bus-bar faults
Because No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, i.e. No. 1 electricity
Source breaker 1DL open position.When II section of bus-bar fault of 110kV, due to being opened in II section of the power circuit distance protection of higher level No. 2
It is dynamic, it could be acted after 0.3s；Simultaneously when II section of bus-bar fault of 110kV, II section of bus of 110kV containing segmented current it is small it is differential after
II section of big differential relay starting of the female difference of electric appliance, 110kV, 110kV bus compound voltage lockout condition are open, and bus differential protection is dynamic
Make, II section of bus bus differential protection action of 110kV jumps breaker and 110kV section switch 3DL on II section of bus of 110kV；Due to
Female difference in the case, is not latched the closing circuit of No. 1 power circuit breaker 1DL of prepared auto restart, so, prepared auto restart still will start
No. 1 power circuit breaker 1DL closes a floodgate, and I section of bus prepared auto restart of 110kV is made to power to No. 1 electric power incoming line.
Outlet line fault on 3.3 I section of 110kV buses
Because No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, i.e. No. 1 electricity
Source breaker 1DL open position.When outlet route (or transformer) failure on I section of bus of 110kV, corresponding protection starting is jumped
Lock, and the big differential relay of 110kV bus differential protection is reflected as that external area error is all not to be will start, thus will not be latched 110 it is standby from
It throws.
Outlet line fault on 3.4 II section of 110kV buses
Because No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, i.e. No. 1 electricity
Source breaker 1DL open position.When outlet route (or transformer) failure on II section of bus of 110kV, corresponding protection starting
Tripping, and the big differential relay of 110kV bus differential protection is reflected as that external area error is all not to be will start, therefore it is standby to be latched 110
From throwing.
It breaks down between 3.5 section switches and segmentation CT
Because No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, i.e. No. 1 electricity
Source breaker 1DL open position.It breaks down when between section switch 3DL and segmentation CT, since segmentation CT is located at 110kV I
Section bus bar side, is equivalent to II section of bus-bar fault of 110kV, small differential relay, 110kV of the II section of bus of 110kV containing segmented current
Female big differential relay of difference starts, II section of bus compound voltage lockout condition of 110kV is open, and bus differential protection action jumps 110kV II
Breaker and 110kV section switch on section bus.
After 110kV section switch tripping, I section of bus-bar fault of 110kV disappears, but I section of bus bus differential protection of 110kV cannot
Movement, so the combined floodgate of No. 1 power circuit breaker 1DL of prepared auto restart cannot be latched.No. 1 power circuit breaker 1DL of prepared auto restart action launching
Combined floodgate on fault bus, due in II section of protection scope of higher level's power circuit distance, thus No. 2 power circuits of higher level away from
From II section protection starts, and could act after 0.3s；Simultaneously when I section of bus-bar fault of 110kV, I section of bus of 110kV is without segmentation electricity
I section of big differential relay starting of the female difference of small differential relay, 110kV of stream, 110kV bus compound voltage lockout condition are open,
Bus differential protection action jumps breaker on I section of bus, cuts off failure.
Or No. 1 power circuit breaker 1DL of prepared auto restart action launching closes a floodgate, but closes a floodgate when on I section of bus of failure, at this point,
Prepared auto restart start No. 1 power circuit breaker 1DL closes a floodgate, I section of bus compound voltage lockout of 110kV is open, the female difference of 110kV it is big it is differential after
Electric appliance acts again, No. 1 electric power incoming line breaker 1DL is from open position becomes closing position, No. 1 electric power incoming line phase current is more than
Setting valve or zero-sequence current are more than I section of bus open circuit of bus differential protection action tripping 110kV after these conditions of setting valve are all satisfied
Device cuts off failure.
At this point, whole station loses power supply.
In addition to the implementation, the present invention can also have other embodiments, all to use equivalent substitution or equivalent transformation shape
At technical solution, be all fallen within the protection domain of application claims.
Claims (4)
1. a kind of anti-section switch dead-zone fault bus differential protection is latched prepared auto restart guard method characterized by comprising
1. bus differential protection action jumps I section of bus breaker and is latched the control that No. 1 power circuit breaker closes a floodgate simultaneously are as follows:
1.1 barring conditions 1
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of I section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker combined floodgate simultaneously；
1.2 barring conditions 2
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of I section of bus of the 110kV without segmented current；
(3) the big differential relay movement of the female difference of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 1 power circuit breaker combined floodgate simultaneously；
1.3 barring conditions 3
1.3.1 exporting T time clearing signal
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
When above-mentioned (1)-(3) condition whole satisfaction, T time clearing signal is exported；
1.3.2 barring condition:
(1) when (1)-(3) condition either condition of above-mentioned 1.3.1 is unsatisfactory for, i.e. the small differential relay of the 110kV poor II section of bus of mother
Or 110kV II section of bus composite voltage element of female big differential relay or 110kV of difference, become returning from acting originally；
(2) there is output T time clearing signal；
(3) when section switch becomes open position from closing position；
(4) the small differential relay of the female poor II section of bus of the 110kV without segmented current is not operating；
(5) I section of bus compound voltage lockout of 110kV is open；
(6) the big differential relay movement of the female difference of 110kV；
(7) the phase current element for being segmented CT is more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, after delay t1 delay, bus differential protection action jumps I section of bus breaker and is latched No. 1 simultaneously
Power circuit breaker closes a floodgate；
1.3 barring conditions 4
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) prepared auto restart starts No. 1 electric power incoming line breaker 1DL and closes a floodgate；
(4) No. 1 electric power incoming line breaker 1DL become closing position from open position；
(5) No. 1 electric power incoming line phase current elements are more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, bus differential protection action jumps I section of bus breaker, and No. 1 power circuit breaker of locking is closed simultaneously
Lock；
2. bus differential protection action jumps II section of bus breaker and is latched the control that No. 2 power circuit breakers close a floodgate simultaneously are as follows:
2.1 barring conditions 1
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
(3) the big differential relay movement of the female difference of 110kV；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 2 power circuit breakers combined floodgates simultaneously；
2.2 barring conditions 2
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the female poor small differential relay movement of II section of bus of the 110kV without segmented current；
(3) the big differential relay movement of the female difference of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of bus breaker and is latched No. 2 power circuit breakers combined floodgates simultaneously；
2.3 barring conditions 3
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) prepared auto restart starts No. 2 electric power incoming line breaker 2DL and closes a floodgate；
(4) No. 2 electric power incoming line breaker 2DL become closing position from open position；
(5) No. 2 electric power incoming line phase current elements are more than setting valve or zero-sequence current component is more than setting valve；
After above-mentioned condition all meets, bus differential protection action jumps I section of bus breaker, and No. 1 power circuit breaker of locking is closed simultaneously
Lock；
3. bus differential protection action is latched the control that section switch closes a floodgate are as follows:
3.1 barring conditions 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) the female poor small differential relay movement of I section of bus of the 110kV containing segmented current；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
3.2 barring conditions 2:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big differential relay movement of the female difference of 110kV；
(3) the female poor small differential relay movement of II section of bus of the 110kV containing segmented current；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
3.3 barring conditions 3:
(1) the big differential relay movement of the female difference of 110kV；
(2) I section of bus compound voltage lockout of 110kV is open or II section of bus compound voltage lockout of 110kV is open；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously.
2. anti-section switch dead-zone fault bus differential protection as described in claim 1 is latched prepared auto restart guard method, feature
It is, wherein output open hour T takes 200-300 milliseconds；T1 takes 20-40 milliseconds.
3. anti-section switch dead-zone fault bus differential protection as described in claim 1 is latched prepared auto restart guard method, feature
It is, the related adjusting protected and requirement are as follows in barring condition 1,2:
1. in barring condition 1,2, the phase current element definite value of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines is by escaping this change
The maximum short-circuit electric of this protection is flowed through in electric institute or 110kV outlet route in electric substation's maximum transformer, when low-voltage bus bar short circuit
Stream adjusting:
(1) in formula,For electric substation's maximum transformation in this electric substation under system maximum operational mode or 110kV outlet route
The maximum short circuit current of this protection, K are flowed through in device, when low-voltage bus bar short circuitkFor safety factor, 1.3-1.5 is taken；
The zero-sequence current component definite value of segmentation or No. 1 electric power incoming line has by the small mode 110kV bus singlephase earth fault of system >=
1.5 times of sensitivity adjusting:
(2) in formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, take
1.5；
2. the phase current that the phase current element of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines takes A phase, B phase, C phase；
The phase current element and zero-sequence current component requirement band directional element of No. 3.1 electric power incoming lines or No. 2 electric power incoming lines, direction member
Part is directed toward: being directed toward bus by route.
4. anti-section switch dead-zone fault bus differential protection as described in claim 1 is latched prepared auto restart guard method, feature
It is, the configuration of higher level substation source side route protection and adjusting requirement are as follows:
1. higher level substation source side route protection configuration requirement
Power circuit configuration fibre-optic current differential protection, I section~III section of phase spacing protection and the ground distance I of higher level substation
Section~III section of protection, I section~III section of zero-sequence current protection and reclosing；
When the power circuit is≤short-term road of 5km when, the power circuit of higher level substation must configure and adjust fibre-optic current
Differential protection.
2. the adjusting of higher level substation source side route protection requires
Wherein I section of zero-sequence current deactivate, I section of phase spacing protection, I section of ground distance and II section of phase spacing protection, be grounded away from
Adjusting from II section, II section of zero-sequence current requires as follows:
(1) I section of phase spacing, I section of ground distance protection
It is adjusted by this line end failure is escaped:
Zzd≤KKZL (3)
(3) K in formulaKFor safety factor, 0.7~0.8 is taken；
I section of phase spacing, I section of the ground distance delay protected are 0s；
When the power circuit is≤short-term road of 5km when, I section of phase spacing, I section of ground distance protection deactivate when can not adjust,
Its defencive function is served as by the fibre-optic current differential protection of configuration complete fibre function；
(2) II section of phase spacing, II section of ground distance protection
By escape on this electric substation or 110kV outlet route in electric substation's maximum transformer, low-voltage bus bar short circuit when this protection most
Small measurement impedance setting:
Zzd≤KKZL+KKbZb (4)
(4) K in formulaK、KKbFor safety factor, 0.7~0.8, Z is takenLFor line impedance, ZbFor transformer impedance；
II section of phase spacing, II section of the ground distance delay protected are 0.3s；
(3) II section of zero-sequence current
There is enough sensitivity to adjust by this line end failure:
(5) in formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, take
1.5；
The delay of II section of zero-sequence current protection is 0.3s；
It is adjusted by above-mentioned requirements, I section of phase spacing protection and I section of ground distance of protection protection scope are the 70% of route route
~80%, II section of phase spacing protection, II section of ground distance protection, II section of zero-sequence current of protection scope are that this route is whole,
And the high-voltage winding part of junior's route or main transformer is protruded into, it is delayed as 0.3s.
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| CN201910261119.7A CN109861180B (en) | 2019-04-02 | 2019-04-02 | Bus differential protection locking spare power automatic switching protection method for preventing dead zone fault of sectional breaker |
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