CN109861181A - A kind of relay protecting method for eliminating segmentation and busbar breaker dead-zone fault - Google Patents
A kind of relay protecting method for eliminating segmentation and busbar breaker dead-zone fault Download PDFInfo
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Abstract
The invention discloses a kind of relay protecting methods for eliminating segmentation and busbar breaker dead-zone fault, applied to transmission and distribution networks for a kind of elimination segmentation or the relay protection of busbar breaker dead-zone fault for electric substation's single-trunk segmental wiring or double bus scheme.Precision maneuver of the present invention cuts off failure.The present invention program is suitable for: (1) 110kV electric substation 110kV sectionalized single busbar connection primary connection circuit；(2) 220kV electric substation 110kV double-bus primary connection circuit；(3) 220kV electric substation 110kV sectionalized single busbar connection primary connection circuit.
Description
Technical field
The present invention relates to a kind of relay protecting methods for eliminating segmentation and busbar breaker dead-zone fault, belong to electrical power distribution
Electric network control technology field.
Background technique
Using single-trunk segmental wiring or double bus scheme electric substation, usually only in section switch or busbar breaker
Side install current transformer, this resulted in section switch or busbar breaker there are dead-zone fault (section switch or
Failure between busbar breaker and section switch or the current transformer of busbar breaker).Section switch or mother are disconnected
There are dead-zone faults for road device, and the failure removal can be made difficult.Currently, being directed to section switch or busbar breaker dead-zone fault
The universal method of use is " envelope CT scheme ": bus differential protection action jumps non-faulting section bus breaker, section switch or mother
Behind breaker dead zone, section switch or busbar breaker dead-zone fault are judged, exit section switch or busbar breaker
Current Transformer Secondary electric current participates in the small difference element differential current computing of faulty section bus.The present invention will propose that one kind is used for electric substation
The elimination segmentation of single-trunk segmental wiring or double bus scheme or the Protection Technology scheme of busbar breaker dead-zone fault.
Summary of the invention
The purpose of the present invention is to provide a kind of relay protecting methods for eliminating segmentation and busbar breaker dead-zone fault, answer
It is disconnected for a kind of elimination segmentation (mother) for electric substation's single-trunk segmental wiring or double bus scheme for transmission and distribution networks
The relay protection of road device dead-zone fault.
The purpose of the present invention is achieved by the following technical programs:
A kind of relay protecting method for eliminating segmentation and busbar breaker dead-zone fault, comprising:
1. the control that bus differential protection action jumps I section of bus breaker 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；
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；
1.3 barring conditions 3:
1.3.1 T time clearing signal is exported:
(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；
It after above-mentioned (1)-(7) condition all meets, is delayed after the t1 time, bus differential protection action jumps I section of bus breaker；
1.4 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 (1)-(5) all meet, bus differential protection action jumps I section of bus breaker；
2. the control that bus differential protection action jumps II section of bus breaker 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；
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；
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 (1)-(5) all meet, bus differential protection action jumps I section of bus breaker；
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；
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；
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.
The purpose of the present invention can also be further realized by following technical measures:
The aforementioned relay protecting method for eliminating segmentation and busbar breaker dead-zone fault, the output open hour T take
200-300 milliseconds；T1 takes 20-40 milliseconds.
Aforementioned elimination is segmented and the relay protecting method of busbar breaker dead-zone fault, related protection in barring condition 1,2
Adjusting and require it is as follows:
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
The maximum short circuit of this protection is flowed through in electric substation or 110kV outlet route in electric substation's maximum transformer, when low-voltage bus bar short circuit
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；
The phase current element of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines takes the phase current of A phase, B phase, C phase；
The phase current element and zero-sequence current component requirement band directional element of No. 1 electric power incoming line or No. 2 electric power incoming lines, direction
Element is directed toward: being directed toward bus by route.
The aforementioned relay protecting method for eliminating segmentation and busbar breaker dead-zone fault, higher level substation source side route are protected
Shield configuration and adjusting require as follows:
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；
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.
Prepared auto restart is installed in 110kV electric substation or the side 220kV substation 110kV, and the requirement of bus differential protection locking prepared auto restart is:
I section of bus differential protection is latched No. 1 electric power incoming line breaker 1DL and section switch 3DL；II section of bus differential protection be latched No. 2 power supplys into
Line breaker 2DL and section switch 3DL.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention can be in various operations using the scheme that electric substation eliminates segmentation (mother) breaker dead-zone fault
Under mode, in segmentation (mother) dead-zone fault, 110kV bus differential protection can precision maneuver, cut off failure.
2, the present invention is latched the scheme of prepared auto restart using electric substation 110kV bus differential protection, and logic is simple and easy.
3, the present invention program is suitable for: (1) 110kV electric substation 110kV sectionalized single busbar connection primary connection circuit；(2) 220kV becomes
Electric institute 110kV double-bus primary connection circuit；(3) 220kV electric substation 110kV sectionalized single busbar connection primary connection circuit.
Detailed description of the invention
Fig. 1 is to eliminate bus tie dead zone failure 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, eliminating bus tie dead zone failure schematic diagram for the present invention.
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.
Single-trunk segmental wiring or double bus scheme electric substation are used for above-mentioned, how to eliminate section switch or mother
There are dead-zone faults for breaker, to meet live service requirement.
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, segmentation open circuit
It breaks down between device 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, segmentation open circuit
It breaks down between device 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.
3, No. 2 power circuit breaker 2DL, section switch 3DL are run, No. 1 power circuit breaker 1DL stand-by heat, segmentation open circuit
It breaks down between device 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.
4, No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL, section switch 3DL operation, section switch with point
It breaks down between section CT
Because No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL, section switch 3DL are run.Work as section switch
It breaks down between 3DL and segmentation CT, since segmentation CT is located at I section of bus bar side of 110kV, is equivalent to II section of bus-bar fault of 110kV,
Small differential relay, 110kV female difference greatly differential relay starting, 110kV II section bus of the II section of bus of 110kV containing segmented current
Compound voltage lockout condition is open, and bus differential protection action jumps breaker and 110kV section switch on II section of bus of 110kV.
After 110kV section switch tripping, I section of bus-bar fault of 110kV is not eliminated.Due in higher level's power circuit distance
In II section of protection scope, so II section of the power circuit distance protection of higher level No. 2 starts, it could be acted after 0.3s；Work as 110kV simultaneously
When I section of bus-bar fault, since 110kV section switch is in open position, I section of bus of 110kV is small without segmented current
I 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 on I section of bus is jumped in shield movement, 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.
Technical solution of the present invention meets following primary connection circuit:
(1) 110kV electric substation 110kV sectionalized single busbar connection primary connection circuit；
(2) 220kV electric substation 110kV double-bus primary connection circuit；
(3) 220kV electric substation 110kV sectionalized single busbar connection primary connection circuit.(as shown in Figure 3)
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 relay protecting method for eliminating segmentation and busbar breaker dead-zone fault characterized by comprising
1. the control that bus differential protection action jumps I section of bus breaker 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；
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；
1.3 barring conditions 3:
1.3.1 T time clearing signal is exported:
(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；
It after above-mentioned (1)-(7) condition all meets, is delayed after the t1 time, bus differential protection action jumps I section of bus breaker；
1.4 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 (1)-(5) all meet, bus differential protection action jumps I section of bus breaker；
2. the control that bus differential protection action jumps II section of bus breaker 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；
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；
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 (1)-(5) all meet, bus differential protection action jumps I section of bus breaker；
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；
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；
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.
2. the relay protecting method as described in claim 1 for eliminating segmentation and busbar breaker dead-zone fault, which is characterized in that
The output open hour T takes 200-300 milliseconds；T1 takes 20-40 milliseconds.
3. the relay protecting method as described in claim 1 for eliminating segmentation and busbar breaker dead-zone fault, which is characterized in that
The related adjusting protected and requirement are as follows in barring condition 1,2:
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 power transformation
Or 110kV outlet route on the maximum short circuit current of this protection is flowed through in electric substation's maximum transformer, when low-voltage bus bar short circuit
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；
The phase current element of segmentation or No. 1 electric power incoming line or No. 2 electric power incoming lines takes the phase current of A phase, B phase, C phase；
The phase current element and zero-sequence current component requirement band directional element of No. 1 electric power incoming line or No. 2 electric power incoming lines, directional element
It is directed toward: bus is directed toward by route.
4. the relay protecting method as described in claim 1 for eliminating segmentation and busbar breaker dead-zone fault, which is characterized in that
The configuration of higher level substation source side route protection and adjusting require as follows:
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；
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；Phase spacing II
Section, 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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| CN112467703A (en) * | 2020-11-16 | 2021-03-09 | 国网河南省电力公司焦作供电公司 | Bus-tie dead zone protection device suitable for 110KV network characteristics |
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