CN106207985A - Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method - Google Patents
Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method Download PDFInfo
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Abstract
The invention discloses a kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method; for 110kV sectionalized single busbar connection primary connection circuit; configuration 110kV bus differential protecting and the protection of 110kV electric power incoming line; realize 110kV bus differential protecting and use electric power incoming line to protect as assistant criteria; to 110kV bus-bar fault locking prepared auto restart, with satisfied on-the-spot service requirement.The present invention use electric substation 110kV bus differential protection locking prepared auto restart scheme can under the various methods of operation during each 110kV bus-bar fault correct operation locking prepared auto restart action close a floodgate; prevent prepared auto restart from missing from throwing on faulty equipment, beneficially power network safety operation.The present invention uses the scheme of electric substation 110kV bus differential protection locking prepared auto restart can be under the various methods of operation during 110kV outlet fault, it is possible to does not misses locking prepared auto restart action and closes a floodgate, improves electrical network power supply reliability.Logic of the present invention is simple.
Description
Technical field
The present invention relates to the single-trunk segmental wiring 110kV bus differential protection locking of a kind of inlet wire of substation protection subsidiary discriminant
The relay protecting method of prepared auto restart, the invention belongs to power transmission and distribution network control technology field.
Background technology
At present do not install special 110kV bus differential protecting due to single-trunk segmental wiring 110kV electric substation, so
Use the protection of 110kV electric power incoming line to carry out locking 110kV automatic throw-in equipment of emergency power supply as 110kV bus protection and (be called for short standby
Haul oneself willingly into).110kV incoming relay-protection locking 110kV prepared auto restart scheme there is problems in that 1. for I section of bus of 110kV or 110kV
When II section of bus has outlet circuit, when outlet line failure, 110kV electric power incoming line protection protection cannot judge be
110kV line fault or 110kV bus-bar fault；2., when two buses of a road electric power incoming line band run, send out at arbitrary bus
Under raw failure condition, the protection of 110kV electric power incoming line cannot judge I section of bus-bar fault of 110kV or II section of bus-bar fault of 110kV.
Above-mentioned two problems is that 110kV electric power incoming line protection blocking 110kV prepared auto restart exists the problem being relatively difficult to solve, and uses
110kV bus differential protection locking prepared auto restart can overcome the problems referred to above.But single-trunk segmental wiring 110kV electric substation installing 110kV
After bus differential protection, how locking prepared auto restart, is the new problem that faces of relay protection staff.The present invention will propose a kind of for
The relay protection of the 110kV single-trunk segmental wiring 110kV bus differential protection locking prepared auto restart of inlet wire of substation protection subsidiary discriminant
Technical scheme.
Summary of the invention
It is an object of the invention to provide a kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking prepared auto restart
Method, for 110kV sectionalized single busbar connection primary connection circuit, configuration 110kV bus differential protecting and the protection of 110kV electric power incoming line,
Realize 110kV bus differential protecting and use electric power incoming line to protect as assistant criteria, standby certainly to 110kV bus-bar fault locking
Throw, with satisfied on-the-spot service requirement.
The purpose of the present invention is achieved by the following technical programs:
A kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, bus bar differential prptection operation jumps I
The control condition that section bus chopper No. 1 power circuit breaker of locking simultaneously closes a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed
Lock；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed
Lock；
Bus bar differential prptection operation jumps the control condition of No. 2 power circuit breakers combined floodgates of II section of bus chopper locking simultaneously:
Meet condition 1:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition is satisfied by, bus bar differential prptection operation jumps II section of bus chopper No. 2 power circuit breakers of locking simultaneously
Close a floodgate；
Or meet condition 2:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position.
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 2 power circuit breakers of locking simultaneously and is closed
Lock；
The control condition that bus bar differential prptection operation locking section switch closes a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 incoming relay-protection actions；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 3:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 4:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 5:
(1) the big balanced relay action of mother's 110kV difference；
(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 bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate.
The purpose of the present invention can also be realized further by techniques below measure:
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and the guarantor of the inlet wire on No. 2 lead-in circuit breaker CT
Protect, at least a section of direction phase distance protection, a section of direction ground distance protection, one section of direction zero-sequence current protection of configuration；On
110kV bus is pointed to by 110kV circuit in the direction stating protection directional element.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and the guarantor of the inlet wire on No. 2 lead-in circuit breaker CT
Protect, at least a section of direction phase current protection, one section of direction zero-sequence current protection of configuration；The direction of above-mentioned protection directional element by
110kV circuit points to 110kV bus.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, wherein phase spacing is protected
Protect, ground distance protection fixed value adjusting method is:
Phase distance protection, ground distance protection definite value are by escaping on this electric substation or 110kV outlet circuit electric substation
In big transformator, low-voltage bus bar short circuit time this protection minimum measurement impedance setting:
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, typically take 0.7-0.8, ZLFor line impedance；When the parameter taking this electric substation
Z during calculatingLIt is 0；ZbFor transformer impedance；
Wherein phase current protection fixed value adjusting method is:
Phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low pressure
The maximum short circuit current flowing through this protection during busbar short-circuit is adjusted:
In above formula,Maximum for electric substation in this electric substation under system maximum operational mode or 110kV outlet circuit
In transformator, low-voltage bus bar short circuit time flow through the maximum short circuit current of this protection, KkFor safety factor, typically take 1.3-1.5；
Wherein direction zero-sequence current fixed value adjusting method is:
Direction zero-sequence current definite value has >=1.5 times by 110kV bus singlephase earth fault under system minimum operational mode
Sensitivity is adjusted:
In above formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, typically takes 1.5.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 electric power incoming line
Protection and No. 2 electric power incoming line guard time definite values take the 0.05-0.10 second.
Compared with prior art, the invention has the beneficial effects as follows:
1. the present invention uses the scheme of electric substation 110kV bus differential protection locking prepared auto restart can be each under the various methods of operation
During 110kV bus-bar fault, correct operation locking prepared auto restart action is closed a floodgate, and prevents prepared auto restart by mistake from throwing on faulty equipment, is conducive to
Power network safety operation.
2. the present invention uses the scheme of electric substation 110kV bus differential protection locking prepared auto restart can be under the various methods of operation
During 110kV outlet fault, it is possible to do not miss locking prepared auto restart action and close a floodgate, improve electrical network power supply reliability.
Logic the most of the present invention is simple.
Accompanying drawing explanation
Fig. 1 is 110kV electric substation sectionalized single busbar connection primary connection circuit figure；
Fig. 2 is 220kV electric substation 110kV double-bus primary connection circuit figure；
Fig. 3 is 110kV bus differential protecting locking prepared auto restart schematic diagram；
In figure, symbol description is as follows:
Representing logical AND relation, when i.e. initial conditions all meets, output is effectively；
Representing logic or relation, i.e. initial conditions are arbitrary when meeting, output is effectively.
Detailed description of the invention
The present invention is 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.
The application conditions of technical solution of the present invention is: only two power supply mothers difference branch roads have a power supply and outlet branch road, transformator
Branch road does not has power supply.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
The transmission and distribution networks that the method for the present invention is applied is electric substation 110kV sectionalized single busbar connection primary connection circuit system network
Network.As it is shown in figure 1, the 110kV system primary connection circuit of this transmission and distribution networks includes: No. 1 electric power incoming line spacing devices, No. 2
Electric power incoming line spacing devices connects I section of bus of 110kV, II section of bus of 110kV respectively；Between I section of bus of 110kV and II section of bus
There is section switch 3DL, and be serially connected with segmented current transformer CT；No. 1 electric power incoming line spacing devices, No. 2 electric power incoming line intervals
Equipment is lead-in circuit breaker 1DL, 2DL, and is serially connected with CT1, CT2 respectively；Additionally, I section of bus of 110kV and II section of bus connect respectively
Have bus-bar potential transformer PT1, PT2, I section of bus of 110kV be further connected with No. 1 transformer branch, No. 2 transformer branch, No. 1
110kV outlet branch road；II section of bus of 110kV is further connected with No. 3 transformer branch, No. 2 110kV outlet branch roads.Fig. 2 is that 220kV becomes
Electricity institute 110kV double-bus primary connection circuit figure, it is possible to application technical scheme.
For above-mentioned 110kV sectionalized single busbar connection primary connection circuit, due to the 110kV side bus protection of configuration, have employed electricity
The source mother difference breaker protection bus-bar fault lock-out scheme to 110kV prepared auto restart, and use electric power incoming line protection to sentence as auxiliary
According to.As it is shown on figure 3, be 110kV bus differential protecting locking prepared auto restart schematic diagram.The incoming relay-protection subsidiary discriminant list of the present invention is female
Line segmentation bus differential protection locking spare power automatic switching method, bus bar differential prptection operation jumps I section of bus chopper No. 1 power circuit breaker of locking simultaneously
The control condition closed a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed
Lock；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed
Lock；
Bus bar differential prptection operation jumps the control condition of No. 2 power circuit breakers combined floodgates of II section of bus chopper locking simultaneously:
Meet condition 1:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition is satisfied by, bus bar differential prptection operation jumps II section of bus chopper No. 2 power circuit breakers of locking simultaneously
Close a floodgate；
Or meet condition 2:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position.
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 2 power circuit breakers of locking simultaneously and is closed
Lock；
The control condition that bus bar differential prptection operation locking section switch closes a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 incoming relay-protection actions；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 3:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 4:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 5:
(1) the big balanced relay action of mother's 110kV difference；
(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 bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and the guarantor of the inlet wire on No. 2 lead-in circuit breaker CT
Protect, at least a section of direction phase distance protection, a section of direction ground distance protection, one section of direction zero-sequence current protection of configuration；On
110kV bus is pointed to by 110kV circuit in the direction stating protection directional element.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and the guarantor of the inlet wire on No. 2 lead-in circuit breaker CT
Protect, at least a section of direction phase current protection, one section of direction zero-sequence current protection of configuration；The direction of above-mentioned protection directional element by
110kV circuit points to 110kV bus.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, wherein phase spacing is protected
Protect, ground distance protection fixed value adjusting method is:
Phase distance protection, ground distance protection definite value are by escaping on this electric substation or 110kV outlet circuit electric substation
In big transformator, low-voltage bus bar short circuit time this protection minimum measurement impedance setting:
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, typically take 0.7-0.8, ZLFor line impedance；When the parameter taking this electric substation
Z during calculatingLIt is 0；ZbFor transformer impedance；
Wherein phase current protection fixed value adjusting method is:
Phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low pressure
The maximum short circuit current flowing through this protection during busbar short-circuit is adjusted:
In above formula,Maximum for electric substation in this electric substation under system maximum operational mode or 110kV outlet circuit
In transformator, low-voltage bus bar short circuit time flow through the maximum short circuit current of this protection, KkFor safety factor, typically take 1.3-1.5；
Wherein direction zero-sequence current fixed value adjusting method is:
Direction zero-sequence current definite value has >=1.5 times by 110kV bus singlephase earth fault under system minimum operational mode
Sensitivity is adjusted:
In above formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, typically takes 1.5.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, described No. 1 electric power incoming line
Protection and No. 2 electric power incoming line guard time definite values take the 0.05-0.10 second.
The work running of the embodiment (by Fig. 2 as a example by) of the inventive method be given below:
1. run when No. 1 power circuit breaker, No. 2 power circuit breakers, section switch stand-by heat:
1.1110kV I section of bus-bar fault
Because No. 1 power circuit breaker, No. 2 power circuit breakers run, section switch stand-by heat, i.e. section switch separating brake
Position.When I section of bus-bar fault of 110kV, No. 1 incoming relay-protection, the big balanced relay startup of mother's 110kV difference, I section of bus of 110kV
Compound voltage lockout condition is open, and bus bar differential prptection operation is jumped I section of bus chopper locking section switch simultaneously and closed a floodgate.
Or when I section of bus-bar fault of 110kV, mother's 110kV big balanced relay of difference starts, I section of bus composite voltage of 110kV
Barring condition is open, and bus bar differential prptection operation locking section switch closes a floodgate.
1.2110kV II section of bus-bar fault
Because No. 1 power circuit breaker, No. 2 power circuit breakers run, section switch stand-by heat, i.e. section switch separating brake
Position.When II section of bus-bar fault of 110kV, No. 2 incoming relay-protections, the big balanced relay startup of mother's 110kV difference, II section of mother of 110kV
Line compound voltage lockout condition is open, and bus bar differential prptection operation is jumped II section of bus chopper locking section switch simultaneously and closed a floodgate.
Or when II section of bus-bar fault of 110kV, mother's 110kV big balanced relay of difference starts, II section of bus compound electric of 110kV
Pressure barring condition is open, and bus bar differential prptection operation locking section switch closes a floodgate.
Outlet line fault on I section of bus of 1.3110kV
Because No. 1 power circuit breaker, No. 2 power circuit breakers run, section switch stand-by heat, i.e. section switch separating brake
Position.When outlet circuit (or transformator) fault on I section of bus of 110kV, the big balanced relay of 110kV bus differential protection is reflected as
External area error, therefore will not locking 110 prepared auto restarts so will not start.
Outlet line fault on II section of bus of 1.4110kV
Because No. 1 power circuit breaker, No. 2 power circuit breakers run, section switch stand-by heat, i.e. section switch separating brake
Position.When outlet circuit (or transformator) fault on II section of bus of 110kV, the big balanced relay of 110kV bus differential protection reflects
For external area error so will not start, therefore will not locking 110 prepared auto restarts.
Break down between 1.5 section switches and segmentation CT
Because No. 1 power circuit breaker, No. 2 power circuit breakers run, section switch stand-by heat, i.e. section switch separating brake
Position.Break down between section switch and segmentation CT, owing to segmentation CT is positioned at I section of bus bar side of 110kV, be equivalent to
I section of bus-bar fault of 110kV, so, No. 1 incoming relay-protection, the big balanced relay startup of mother's 110kV difference, I section of bus of 110kV are combined
Voltage blocking condition is open, and bus bar differential prptection operation is jumped I section of bus chopper locking section switch simultaneously and closed a floodgate.
2. run when No. 1 power circuit breaker, section switch, No. 2 power circuit breaker stand-by heats
2.1110kV I section of bus-bar fault
Because No. 1 power circuit breaker, section switch run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When I section of bus-bar fault of 110kV, I section of bus meter of 110kV and the little balanced relay of segmented current, 110kV mother
The big balanced relay of difference starts, I section of bus compound voltage lockout condition of 110kV is open, and bus bar differential prptection operation jumps I section of bus open circuit
Device and section switch close a floodgate；Due to mother's difference in the case, there is no the closing circuit of No. 2 power circuit breakers of locking prepared auto restart,
So, prepared auto restart still can start No. 2 power circuit breakers and close a floodgate, and makes 110kV II section of bus prepared auto restart to No. 2 electric power incoming line supply
Electricity.
2.2110kV II section of bus-bar fault
Because No. 1 power circuit breaker, section switch run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When II section of bus-bar fault of 110kV, II section of bus meter of 110kV and the little balanced relay of segmented current, 110kV
The big balanced relay of female difference starts, II section of bus compound voltage lockout condition of 110kV is open, and bus bar differential prptection operation jumps II section of bus
Chopper, section switch, the prepared auto restart of locking simultaneously starts the combined floodgate of No. 2 power circuit breakers, it is ensured that 110kV I section of bus
Power supply.
Outlet line fault on I section of bus of 2.3110kV
Because No. 1 power circuit breaker, section switch run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When outlet circuit (or transformator) fault on I section of bus of 110kV, the big balanced relay of 110kV bus differential protection is anti-
Reflect and will not start for external area error is all, therefore will not locking 110 prepared auto restarts.
Outlet line fault on II section of bus of 2.4110kV
Because No. 1 power circuit breaker, section switch run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When outlet circuit (or transformator) fault on II section of bus of 110kV, the big balanced relay of 110kV bus differential protection
It is reflected as that external area error is all will not be started, therefore will not locking 110 prepared auto restarts.
Break down between 2.5 section switches and segmentation CT
Because No. 1 power circuit breaker, section switch run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.Break down between section switch and segmentation CT, owing to segmentation CT is positioned at I section of bus bar side of 110kV, be equivalent to
II section of bus-bar fault of 110kV, II section of bus meter of 110kV and the little balanced relay of segmented current, mother's 110kV big differential relay of difference
Device starts, II section of bus compound voltage lockout condition of 110kV is open, and bus bar differential prptection operation jumps II section of bus chopper and segmentation is broken
Road device, locking prepared auto restart starts the combined floodgate of No. 2 power circuit breakers simultaneously.After section switch tripping, fault still exists, now
No. 1 incoming relay-protection and mother's 110kV big balanced relay of difference start, I section of bus compound voltage lockout condition of 110kV is open, female poor
Protection act jumps I section of bus chopper.
3. run when No. 2 power circuit breakers, section switch, No. 1 power circuit breaker stand-by heat
3.1110kV I section of bus-bar fault
Because No. 2 power circuit breakers, section switches run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When I section of bus-bar fault of 110kV, I section of bus meter of 110kV and the little balanced relay of segmented current, 110kV mother
The big balanced relay of difference starts, I section of bus compound voltage lockout condition of 110kV is open, and bus bar differential prptection operation jumps I section of bus open circuit
Device and section switch close a floodgate, and the prepared auto restart of locking simultaneously starts the combined floodgate of No. 1 power circuit breaker, it is ensured that II section of mother of 110kV
The power supply of line.
3.2110kV II section of bus-bar fault
Because No. 2 power circuit breakers, section switches run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When II section of bus-bar fault of 110kV, when II section of bus-bar fault of 110kV, II section of bus meter of 110kV and Segmented electrical
The little balanced relay of stream, mother's 110kV big balanced relay of difference start, II section of bus compound voltage lockout condition of 110kV is open,
Bus bar differential prptection operation jumps II section of bus chopper, section switch；Due to mother's difference in the case, there is no locking prepared auto restart 1
The closing circuit of power circuit breaker, so, prepared auto restart still can start No. 1 power circuit breaker and close a floodgate, and makes II section of bus of 110kV standby
Power from throwing into No. 1 electric power incoming line.
Outlet line fault on I section of bus of 3.3110kV
Because No. 2 power circuit breakers, section switches run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When outlet circuit (or transformator) fault on I section of bus of 110kV, the big balanced relay of 110kV bus differential protection is anti-
Reflect and will not start for external area error is all, therefore will not locking 110 prepared auto restarts.
Outlet line fault on II section of bus of 3.4110kV
Because No. 2 power circuit breakers, section switches run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When outlet circuit (or transformator) fault on II section of bus of 110kV, the big balanced relay of 110kV bus differential protection
It is reflected as that external area error is all will not be started, therefore will not locking 110 prepared auto restarts.
Break down between 3.5 section switches and segmentation CT
Because No. 2 power circuit breakers, section switches run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.Break down between section switch and segmentation CT, owing to segmentation CT is positioned at I section of bus bar side of 110kV, be equivalent to
II section of bus-bar fault of 110kV, II section of bus meter of 110kV and the little balanced relay of segmented current, mother's 110kV big differential relay of difference
Device starts, II section of bus compound voltage lockout condition of 110kV is open, and bus bar differential prptection operation jumps II section of bus chopper and segmentation is broken
Road device.Now, due to the combined floodgate of now bus bar differential prptection operation not locking No. 1 power circuit breaker of prepared auto restart, therefore No. 1 electric power incoming line breaks
Road device closes a floodgate, and I section of bus of 110kV is certainly thrown into No. 1 electric power incoming line and powered, but trouble point still exists, after section switch tripping,
No. 2 electric power incoming line protections and mother's 110kV big balanced relay of difference start, I section of bus compound voltage lockout condition of 110kV is open,
Bus differential protection I section of bus chopper of action tripping again.
In addition to the implementation, the present invention can also have other embodiments, all employing equivalents or equivalent transformation shape
The technical scheme become, all falls within the protection domain of application claims.
Claims (6)
1. an incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, it is characterised in that female difference is protected
Protecting the control condition that the while that I section of bus chopper being jumped in action, No. 1 power circuit breaker of locking closes a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed a floodgate；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 1 power circuit breaker of locking simultaneously and is closed a floodgate；
Bus bar differential prptection operation jumps the control condition of No. 2 power circuit breakers combined floodgates of II section of bus chopper locking simultaneously:
Meet condition 1:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition is satisfied by, bus bar differential prptection operation is jumped II section of bus chopper No. 2 power circuit breakers of locking simultaneously and is closed a floodgate；
Or meet condition 2:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position.
After above-mentioned condition meets, bus bar differential prptection operation is jumped I section of bus chopper No. 2 power circuit breakers of locking simultaneously and is closed a floodgate；
The control condition that bus bar differential prptection operation locking section switch closes a floodgate is:
Meet condition 1:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from I section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 2:
(1) I section of bus compound voltage lockout of 110kV is open；
(2) No. 1 incoming relay-protection actions；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 3:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) the big balanced relay action of mother's 110kV difference；
(3) mother 110kV differs from II section of bus score section or the little balanced relay action of mother CT electric current；
(4) section switch is at closing position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 4:
(1) II section of bus compound voltage lockout of 110kV is open；
(2) No. 2 electric power incoming line protection act；
(3) the big balanced relay action of mother's 110kV difference；
(4) section switch is at open position；
After above-mentioned condition meets, bus bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate；
Or meet condition 5:
(1) the big balanced relay action of mother's 110kV difference；
(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 bar differential prptection operation is jumped section switch locking section switch simultaneously and is closed a floodgate.
2. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method as claimed in claim 1, it is special
Levying and be, described No. 1 incoming relay-protection, No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and 2
Incoming relay-protection on number lead-in circuit breaker CT, at least one section of direction phase distance protection of configuration, one section of direction ground distance protection,
One section of direction zero-sequence current protection；110kV bus is pointed to by 110kV circuit in the direction of above-mentioned protection directional element.
3. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method as claimed in claim 1, it is special
Levying and be, described No. 1 incoming relay-protection, No. 2 incoming relay-protections are respectively arranged on the incoming relay-protection on No. 1 lead-in circuit breaker CT and 2
Incoming relay-protection on number lead-in circuit breaker CT, at least a section of direction phase current protection, one section of direction zero-sequence current protection of configuration；On
110kV bus is pointed to by 110kV circuit in the direction stating protection directional element.
4. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method as claimed in claim 2, it is special
Levying and be, described direction phase distance protection, direction ground distance protection fixed value adjusting method be:
Direction phase distance protection, direction ground distance protection definite value are by escaping power transformation on this electric substation or 110kV outlet circuit
In the maximum transformator of institute, low-voltage bus bar short circuit time this protection minimum measurement impedance setting:
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, typically take 0.7-0.8, ZLFor line impedance；When the parameter taking this electric substation calculates
Time ZLIt is 0；ZbFor transformer impedance；
Described direction zero-sequence current fixed value adjusting method is:
Direction zero-sequence current definite value has >=1.5 times sensitive by 110kV bus singlephase earth fault under system minimum operational mode
Degree is adjusted:
In above formula formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, one
As take 1.5.
5. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method as claimed in claim 3, it is special
Levying and be, described direction phase current protection fixed value adjusting method is:
Direction phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low pressure
The maximum short circuit current flowing through this protection during busbar short-circuit is adjusted:
In above formula,For electric substation's maximum transformation in this electric substation under system maximum operational mode or 110kV outlet circuit
In device, low-voltage bus bar short circuit time flow through the maximum short circuit current of this protection, KkFor safety factor, typically take 1.3-1.5；
Described direction zero-sequence current fixed value adjusting method is:
Direction zero-sequence current definite value has >=1.5 times sensitive by 110kV bus singlephase earth fault under system minimum operational mode
Degree is adjusted:
In above formula,For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, typically
Take 1.5.
6. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method as claimed in claim 1, it is special
Levying and be, described No. 1 electric power incoming line protection and No. 2 electric power incoming line guard time definite values take the 0.05-0.1 second.
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