CN109980615A - Eliminate section switch and busbar breaker dead-zone fault relay protecting method - Google Patents
Eliminate section switch and busbar breaker dead-zone fault relay protecting method Download PDFInfo
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- CN109980615A CN109980615A CN201910261115.9A CN201910261115A CN109980615A CN 109980615 A CN109980615 A CN 109980615A CN 201910261115 A CN201910261115 A CN 201910261115A CN 109980615 A CN109980615 A CN 109980615A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The invention discloses a kind of elimination section switch and busbar breaker dead-zone fault relay protecting methods; it can be applied to transmission and distribution networks, the elimination segmentation or the relay protection of busbar breaker dead-zone fault of the single-trunk segmental wiring or double bus scheme of section switch first jumped for electric substation.The present invention eliminates the scheme of segmentation or busbar breaker dead-zone fault using electric substation 110kV bus differential protection; it can be when the various methods of operation issue estranged section or bus tie dead zone failure; bus differential protection can correctly act excision faulty section bus; it can guarantee that non-faulting bus remains to continue to run; conducive to power network safety operation, power grid power supply reliability is improved.Logic of the present invention is simple and easy.The present invention program is suitable for 110kV electric substation 110kV sectionalized single busbar connection primary connection circuit；220kV electric substation 110kV double-bus primary connection circuit；220kV electric substation 110kV sectionalized single busbar connection primary connection circuit.
Description
Technical field
The present invention relates to a kind of elimination section switch and busbar breaker dead-zone fault relay protecting methods, belong to electric power
Transmission and distribution networks 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 section switch and busbar breaker dead-zone fault relay protecting method of single-trunk segmental wiring or double bus scheme.
Summary of the invention
The purpose of the present invention is to provide a kind of elimination section switch and busbar breaker dead-zone fault relay protection sides
Method can be applied to transmission and distribution networks, and the single-trunk segmental wiring or double bus scheme of section switch are first jumped for electric substation
Elimination segmentation or busbar breaker dead-zone fault relay protection.
The purpose of the present invention is achieved by the following technical programs:
A kind of elimination section switch and busbar breaker dead-zone fault relay protecting method, 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 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；
1.2 barring conditions 2:
1.2.1 T time clearing signal condition 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；
1.2.2 barring condition:
(1) when (1)-(3) condition either condition of above-mentioned 1.2.1 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 3DL 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 elements being segmented are more than setting valve or zero-sequence current component element is more than setting valve；
After above-mentioned condition all meets, after delay time t1, bus differential protection action jumps I section of bus breaker；
Output open hour T takes 200-300 milliseconds；Delay t1 takes 20-40 milliseconds.
1.3 barring conditions 3:
(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；
The phase current element of (5) No. 1 electric power incoming lines is 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. 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 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；
2.1 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) 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；
The phase current element of (5) No. 2 electric power incoming lines is 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；
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) 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 section switch and is latched section switch combined floodgate simultaneously；
3.3 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) 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；
3.4 barring conditions 4:
(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 section switch and is latched section switch combined floodgate simultaneously；
3.5 barring conditions 5:
(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 elimination section switch and busbar breaker dead-zone fault relay protecting method, wherein in barring condition 1,2
The adjusting and requirement of correlation 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 elimination section switch and busbar breaker dead-zone fault relay protecting method, wherein higher level substation power supply
Side line road relaying configuration and adjusting require:
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.
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 eliminates the scheme of segmentation (mother) breaker dead-zone fault, energy using electric substation 110kV bus differential protection
Enough when the various methods of operation issue estranged section of (mother) dead-zone fault, bus differential protection can correctly act excision faulty section
Bus can guarantee that non-faulting bus remains to continue to run, be conducive to power network safety operation, and it is reliable to improve power grid power supply
Property.
2. the present invention, using the scheme of electric substation 110kV bus differential protection locking prepared auto restart, logic is simple and easy.
3. the present invention program is useful in: (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.
It is as shown in Figure 1 elimination section switch and busbar breaker dead-zone fault relay protecting method 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.
As shown in figure 3, it is can also be applied to 220kV electric substation 110kV double-bus primary connection circuit (or single busbar point
Section) primary master connects.
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.Differentiate that segmented current is not involved in by section switch 3DL automatically in quartile since bus differential protection has
I section of bus of 110kV or the small difference element spill current of II section of bus of 110kV calculate, and send out when between section switch 3DL and segmentation CT
Raw failure is equivalent to I section of bus-bar fault of 110kV, so I section of bus of 110kV is not since segmentation CT is located at I section of bus bar side of 110kV
I section of big differential relay starting of the female difference of small differential relay, 110kV containing segmented current, 110kV bus compound voltage lockout item
Part is open, and I section of bus bus differential protection action of 110kV jumps I section of bus breaker and be latched section switch 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, and bus differential protection action is latched section switch 3DL and 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, 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 points
Section breaker；In the case due to the female difference of 110kV, it is not latched the closing circuit of No. 2 power circuit breakers of prepared auto restart, so,
Prepared auto restart still will start No. 2 power circuit breakers and close a floodgate, and II section of bus prepared auto restart of 110kV is made to power to No. 2 electric power incoming lines, guarantee
The power supply of II section of bus of 110kV.
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
Breaker 3DL tripping, after section switch 3DL tripping, section switch 3DL becomes open position, 110kV II from closing position
The section II section of bus compound voltage lockout element of small differential relay, 110kV of bus containing segmented current becomes returning from acting,
Small differential relay akinesia of the II section of bus of 110kV containing segmented current, the big differential relay of the female difference of 110kV still starts,
The phase current element movement or zero-sequence current component of segmentation act, and I section of bus compound voltage lockout condition of 110kV opens these
After condition is all satisfied, it is delayed after t1, breaker on I section of bus of bus differential protection action tripping 110kV, while being latched prepared auto restart 1
The combined floodgate of power circuit breaker.
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 points
Section breaker, ensure that II section of bus of 110kV continues to power.
After 110kV section switch tripping, I section of bus-bar fault of 110kV disappears, but I section of bus bus differential protection of 110kV is corresponding
Small differential relay without segmented current and big differential relay do not act, so No. 1 power supply of prepared auto restart cannot be latched
The combined floodgate of breaker 1D.The combined floodgate of No. 1 power circuit breaker 1DL of prepared auto restart action launching is on fault bus, due in higher level's electricity
In II section of protection scope of source route distance, so II section of the power circuit distance protection of higher level No. 2 starts, it could be acted after 0.3s；
Simultaneously when I section of bus-bar fault of 110kV, small differential relay, 110kV female difference of the I section of bus of 110kV without segmented current is big poor
I section of motor type relay starting, 110kV bus compound voltage lockout condition are open, and bus differential protection action jumps breaker on I section of bus,
Cut 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 movement, I section of bus compound voltage lockout of 110kV is open, the big differential relay of the female difference of 110kV acts again, No. 1 power supply
Incoming breaker 1DL becomes closing position, No. 1 electric power incoming line phase current more than setting valve or zero-sequence current from open position
After these conditions of setting valve are all satisfied, I section of bus breaker of bus differential protection action tripping 110kV cuts off failure.
4. No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL, section switch 3DL run, 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 110kV section switch, ensure that II section of bus of 110kV continues to supply
Electricity.
After 110kV section switch tripping, I section of bus-bar fault of 110kV is not eliminated,.After 110kV section switch tripping
In open position, due in II section of protection scope of higher level's power circuit distance, so No. 2 power circuit distances II of higher level
Section protection starts, and could act after 0.3s；Small differential relay, 110kV of the I section of bus of 110kV without segmented current are female at this time
I section of poor big differential relay starting, 110kV bus compound voltage lockout condition are open, and bus differential protection action is jumped to break on I section of bus
Road device 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 can be applied to 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 elimination section switch and busbar breaker dead-zone fault relay protecting method 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 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；
1.2 barring conditions 2:
1.2.1 T time clearing signal condition 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；
1.2.2 barring condition:
(1) when (1)-(3) condition either condition of above-mentioned 1.2.1 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 3DL 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 elements being segmented are more than setting valve or zero-sequence current component element is more than setting valve；
After above-mentioned condition all meets, after delay time t1, bus differential protection action jumps I section of bus breaker；
1.3 barring conditions 3:
(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；
The phase current element of (5) No. 1 electric power incoming lines is 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. 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 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；
2.1 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) 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；
The phase current element of (5) No. 2 electric power incoming lines is 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；
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) 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 section switch and is latched section switch combined floodgate simultaneously；
3.3 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) 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；
3.4 barring conditions 4:
(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 section switch and is latched section switch combined floodgate simultaneously；
3.5 barring conditions 5:
(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. eliminating section switch and busbar breaker dead-zone fault relay protecting method, feature as described in claim 1
It is, the output open hour T takes 200-300 milliseconds；Delay t1 takes 20-40 milliseconds.
3. eliminating section switch and busbar breaker dead-zone fault relay protecting method, feature as described in claim 1
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. eliminating section switch and busbar breaker dead-zone fault relay protecting method, feature as described in claim 1
It is, wherein the configuration of higher level substation source side route protection and adjusting require:
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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111856213A (en) * | 2020-08-05 | 2020-10-30 | 云南电网有限责任公司红河供电局 | Fault positioning method for looped network operation |
| 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 |
| CN117081014A (en) * | 2023-10-13 | 2023-11-17 | 云南电力试验研究院(集团)有限公司 | Bus compound ratio differential protection method and device |
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| JPH01157218A (en) * | 1987-12-11 | 1989-06-20 | Meidensha Corp | Protecting system of electric power system |
| CN101557101A (en) * | 2008-10-14 | 2009-10-14 | 吴宏斌 | Relay protection method for eliminating failure in transformer dead zone |
| CN106207985A (en) * | 2016-08-29 | 2016-12-07 | 国网江苏省电力公司镇江供电公司 | Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method |
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| JPH01157218A (en) * | 1987-12-11 | 1989-06-20 | Meidensha Corp | Protecting system of electric power system |
| CN101557101A (en) * | 2008-10-14 | 2009-10-14 | 吴宏斌 | Relay protection method for eliminating failure in transformer dead zone |
| CN106207985A (en) * | 2016-08-29 | 2016-12-07 | 国网江苏省电力公司镇江供电公司 | Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111856213A (en) * | 2020-08-05 | 2020-10-30 | 云南电网有限责任公司红河供电局 | Fault positioning method for looped network operation |
| 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 |
| 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 |
| CN117081014A (en) * | 2023-10-13 | 2023-11-17 | 云南电力试验研究院(集团)有限公司 | Bus compound ratio differential protection method and device |
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