CN106169740A - 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method - Google Patents

110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method Download PDF

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Publication number
CN106169740A
CN106169740A CN201610763259.0A CN201610763259A CN106169740A CN 106169740 A CN106169740 A CN 106169740A CN 201610763259 A CN201610763259 A CN 201610763259A CN 106169740 A CN106169740 A CN 106169740A
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China
Prior art keywords
protection
section
bus
outlet
prepared auto
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CN201610763259.0A
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CN106169740B (en
Inventor
汤大海
陈永明
李静
曹斌
孙东杰
马海薇
陈燕
丁国华
施伟成
潘书燕
王寅丞
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Zhenjiang Power Supply Company State Grid Jiangsu Electric Power Co
Nari Technology Co Ltd
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Zhenjiang Power Supply Company State Grid Jiangsu Electric Power Co
Nari Technology Co Ltd
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Priority to CN201610763259.0A priority Critical patent/CN106169740B/en
Publication of CN106169740A publication Critical patent/CN106169740A/en
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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
    • 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
    • H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices

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  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a kind of 10kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, give the incoming relay-protection action locking prepared auto restart control condition that No. 1 power circuit breaker closes a floodgate, the control condition of No. 2 power circuit breakers combined floodgates of incoming relay-protection action locking prepared auto restart, the control condition of incoming relay-protection action locking prepared auto restart section switch combined floodgate.The present invention can occur correct operation during various 110kV bus-bar fault under the various methods of operation, and locking prepared auto restart closes a floodgate, and prevents prepared auto restart from missing from throwing on faulty equipment, beneficially power network safety operation；Under the various methods of operation, when there is 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；Technical scheme logic is simple.

Description

110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method
Technical field
The present invention relates to a kind of 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, belong to Power transmission and distribution network control technology field.
Background technology
Owing to electric substation's 110kV single-trunk segmental wiring does not install special 110kV bus differential protecting, so using 110kV incoming relay-protection carrys out locking 110kV automatic throw-in equipment of emergency power supply (abbreviation prepared auto restart) as 110kV bus protection. 110kV incoming relay-protection locking 110kV prepared auto restart Normal practice is: I section of bus-bar fault by No. 1 electric power incoming line protection blocking, II section Bus-bar fault is by No. 2 electric power incoming line protection blockings；No. 1 electric power incoming line protection, No. 2 electric power incoming line protection act and sectionalised protection close The combined floodgate of lock section switch.When such way has an outlet circuit for I section of bus of 110kV or II section of bus of 110kV the most not Adapt to because during outlet line failure, 110kV electric power incoming line protection cannot judge 110kV outlet fault or 110kV bus-bar fault.Therefore, the present invention proposes a kind of to close for electric substation 110kV single-trunk segmental wiring 110kV incoming relay-protection The Protection Technology scheme of lock prepared auto restart.
Summary of the invention
It is an object of the invention to provide a kind of 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protection Method, is applied to electric substation 110kV sectionalized single busbar connection primary connection circuit grid, and this main electrical scheme grid only has two power supplys Inlet wire branch road has power supply and outlet branch road, transformer branch do not have power supply, and the present invention can occur respectively under the various methods of operation Correct operation when planting 110kV bus-bar fault, locking prepared auto restart closes a floodgate, and prevents prepared auto restart by mistake from throwing on faulty equipment, works as generation During 110kV outlet fault, it is possible to do not miss locking prepared auto restart action and close a floodgate, to improve electrical network power supply reliability.
The purpose of the present invention is achieved by the following technical programs:
A kind of 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, incoming relay-protection action is closed The control condition that lock No. 1 power circuit breaker of prepared auto restart closes a floodgate is:
1) there is no the block signal of outlet protection act on I section of bus of 110kV；Outlet protection act on I section of bus of 110kV Block signal condition be: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
The control condition that No. 2 power circuit breakers of incoming relay-protection action locking prepared auto restart close a floodgate is:
1) there is no outlet protection act block signal on II section of bus of 110kV；Outlet protection act on II section of bus of 110kV Block signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 2 power circuit breakers of locking prepared auto restart and close a floodgate；
The control condition that incoming relay-protection action locking prepared auto restart section switch closes a floodgate has 3, is respectively as follows:
Barring condition 1:
1) there is no outlet protection act block signal on I section of bus of 110kV；On I section of bus of 110kV, outlet protection act closes Lock signal condition is: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 2:
1) there is no outlet protection act block signal on II section of bus of 110kV；Outlet protection act on II section of bus of 110kV Block signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 3:
1) section switch protection act, delay time t；
2) section switch is at open position；
After above-mentioned condition meets and the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
On I section of bus of described 110kV, outlet protection includes that outlet branch protection on I section of bus of 110kV, transformer differential are protected Protect and transformator 110kV side back-up protection；On II section of bus of 110kV, outlet protection includes outlet branch road on II section of bus of 110kV Protection, transformer differential protection and transformator 110kV side back-up protection；
Described No. 1 electric power incoming line protection, No. 2 electric power incoming line protections are for by phase distance protection, ground distance protection, direction Zero-sequence current protection is constituted.
The purpose of the present invention can also be realized further by techniques below measure:
Aforementioned 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, described No. 1 electric power incoming line Protection, No. 2 electric power incoming line protections are for being made up of phase current protection, direction zero-sequence current protection.
Aforementioned 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, wherein No. 1 electric power incoming line Protection and No. 2 electric power incoming line protection fixed value adjustings are as follows:
1) phase distance protection, ground distance protection fixed value adjusting:
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；
2) direction zero-sequence current fixed value adjusting:
Direction zero-sequence current definite value has the >=spirit of 1.5 times by system minimum operational mode 110kV bus singlephase earth fault Sensitivity is adjusted:
I z d ≤ I k . m i n ( 1 ) / K l m
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 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, wherein No. 1 electric power incoming line Protection and No. 2 electric power incoming line protection fixed value adjustings are as follows:
1) phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low The maximum short circuit current flowing through this protection during pressure busbar short-circuit is adjusted:
I z d ≥ K l m I k . m a x ( 3 )
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；
2) direction zero-sequence current fixed value adjusting:
Direction zero-sequence current definite value has the >=spirit of 1.5 times by system minimum operational mode 110kV bus singlephase earth fault Sensitivity is adjusted:
I z d ≤ I k . m i n ( 1 ) / K l m
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 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, for preventing electric power incoming line Protection and outlet protection act are vied each other and are caused protection locking prepared auto restart action by mistake to close a floodgate, and wherein delay time t takes 30 milliseconds.
Aforementioned 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, wherein No. 1 electric power incoming line Protection and No. 2 electric power incoming line guard time definite values take 0.05 second.
Compared with prior art, the invention has the beneficial effects as follows:
1. the present invention can occur correct operation during various 110kV bus-bar fault under the various methods of operation, and locking is standby certainly Cater to lock, prevent prepared auto restart from missing from throwing on faulty equipment, beneficially power network safety operation；
2. the present invention is under the various methods of operation, when there is 110kV outlet fault, it is possible to does not miss locking prepared auto restart action and closes Lock, improves electrical network power supply reliability；
3. technical scheme logic 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 (sectionalized single busbar connection) primary connection circuit figure；
Fig. 3 is 110kV incoming relay-protection 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；
-represent delay time t millisecond；
It is expressed as contrary with input signal.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
This programme 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.
Once lead as it is shown in figure 1, the transmission and distribution networks that the method for the present invention is applied is electric substation's 110kV sectionalized single busbar connection Wiring system network.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, and be serially connected with segmented current transformer (hereinafter referred to as CT)；No. 1 electric power incoming line spacing devices, No. 2 power supplys enter Line spacing devices has lead-in circuit breaker, and is serially connected with CT；Additionally, I section of bus of 110kV and section bus are connected to 110kV busbar voltage Transformer, I section of bus of 110kV is further connected with No. 1 transformer branch, No. 2 transformer branch, No. 1 110kV outlet branch road and 110kV Voltage transformer (hereinafter referred to as PT)；II section of bus of 110kV be further connected with No. 3 transformer branch, No. 2 110kV outlet branch roads and 110kV PT.220kV electric substation 110kV double-bus (sectionalized single busbar connection) master that the technical program can also be used for as shown in Figure 2 connects Line.
For above-mentioned 110kV sectionalized single busbar connection primary connection circuit, due to the 110kV side bus protection being configured without, use The electric power incoming line breaker protection bus-bar fault lock-out scheme to 110kV prepared auto restart, the program for 110kV I section of bus or 110kV cannot adapt to when II section of bus has outlet circuit, because during outlet line failure, 110kV electric power incoming line is protected Protect and cannot judge 110kV line fault or 110kV bus-bar fault.It is necessary to propose a kind of new for single-trunk segmental wiring The Protection Technology scheme of 110kV electric substation 110kV incoming relay-protection locking prepared auto restart meets on-the-spot service requirement.Such as Fig. 3 Showing 110kV incoming relay-protection locking prepared auto restart schematic diagram, the 110kV single-trunk segmental wiring incoming relay-protection locking of the present invention is standby Hauling oneself willingly into relay protecting method, the control condition that No. 1 power circuit breaker of incoming relay-protection action locking prepared auto restart closes a floodgate is:
1) there is no the block signal of outlet protection act on I section of bus of 110kV；Outlet protection act on I section of bus of 110kV Block signal condition be: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
The control condition that No. 2 power circuit breakers of incoming relay-protection action locking prepared auto restart close a floodgate is:
1) there is no outlet protection act block signal on II section of bus of 110kV；Outlet protection act on II section of bus of 110kV Block signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 2 power circuit breakers of locking prepared auto restart and close a floodgate；
The control condition that incoming relay-protection action locking prepared auto restart section switch closes a floodgate has 3, is respectively as follows:
Barring condition 1:
1) there is no outlet protection act block signal on I section of bus of 110kV；On I section of bus of 110kV, outlet protection act closes Lock signal condition is: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 2:
1) there is no outlet protection act block signal on II section of bus of 110kV；Outlet protection act on II section of bus of 110kV Block signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 3:
1) section switch protection act, delay time t；
2) section switch is at open position；
After above-mentioned condition meets and the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
On I section of bus of described 110kV outlet protection mean outlet protection on I section of bus of 110kV, transformer differential protection and Transformator 110kV side back-up protection；On II section of bus of 110kV, outlet protection means outlet protection, transformation on II section of bus of 110kV Device differential protection and transformator 110kV side back-up protection；
Described No. 1 electric power incoming line protection, No. 2 electric power incoming line protections are for by phase distance protection, ground distance protection, direction Zero-sequence current protection is constituted, or is made up of phase current protection, direction zero-sequence current protection.
No. 1 electric power incoming line protection and No. 2 electric power incoming line protection fixed value adjustings are as follows:
1) phase distance protection, ground distance protection fixed value adjusting:
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；
2) direction zero-sequence current fixed value adjusting:
Direction zero-sequence current definite value has the >=spirit of 1.5 times by system minimum operational mode 110kV bus singlephase earth fault Sensitivity is adjusted:
I z d ≤ I k . m i n ( 1 ) / K l m
In above formula formula, I k . m i n ( 1 ) For 110kV bus single-phase short circuit current, K under system minimum operational modelmFor sensitive system Number, typically takes 1.5.
3) phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low The maximum short circuit current flowing through this protection during pressure busbar short-circuit is adjusted:
I z d ≥ K l m I k . m a x ( 3 )
In above formula, I k . m a x ( 3 ) 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；
Cause protection locking prepared auto restart action by mistake to close a floodgate for preventing electric power incoming line protection from vying each other with outlet protection act, Wherein delay time t takes 30 milliseconds.Described No. 1 electric power incoming line protection and No. 2 electric power incoming line guard time definite values take 0.05 second.
The specific embodiment of the inventive method and protection act process and implementation result be given below:
No. 1.1 power circuit breakers, No. 2 power circuit breakers run, 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, the protection of No. 1 electric power incoming line start and on I section of bus of 110kV outlet protection do not start I section of bus compound voltage lockout condition of (on II section of bus of 110kV, outlet protects not faults not start), 110kV is open, After the time delay t time, start locking prepared auto restart section switch close 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 power protections start and on II section of bus of 110kV outlet protection do not start II section of bus compound voltage lockout condition of (on I section of bus of 110kV, outlet protects not faults not start), 110kV is open, After the time delay t time, start locking prepared auto restart section switch close 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, outlet protection act on I section of bus of 110kV, locking The combined floodgate of 110 prepared auto restart action launching section switches.
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, outlet protection act on II section of bus of 110kV, closes Lock the combined floodgate of 110 prepared auto restart action launching section switches.
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, No. 1 electric power incoming line protection all starts with section switch protection；No. 1 power protection starts and 110kV On I section of bus, outlet protection does not starts (on II section of bus of 110kV, outlet protects not faults not start), I section of mother of 110kV Line compound voltage lockout condition is open, or section switch protection start after after the time delay t time, locking 110kV prepared auto restart moves Make to start the combined floodgate of section switch.
No. 2.1 power circuit breakers, section switches run, 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, No. 1 power protection start and on I section of bus of 110kV outlet protection do not start I section of bus compound voltage lockout condition of (on II section of bus of 110kV, outlet protects not faults not start), 110kV is open, After the time delay t time, start No. 2 power circuit breakers of locking prepared auto restart close a floodgate.
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, No. 1 power protection start and on I section of bus of 110kV outlet protection do not start I section of bus compound voltage lockout condition of (on II section of bus of 110kV, outlet protects not faults not start), 110kV is open, After the time delay t time, start No. 2 power circuit breakers of locking prepared auto restart close a floodgate.
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, outlet protection act on I section of bus of 110kV, The locking combined floodgate of 110kV No. 2 power circuit breakers of prepared auto restart action launching.
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, on II section of bus of 110kV, outlet protection is dynamic To make simultaneously section switch be closing position, the locking combined floodgate of 110 No. 2 power circuit breakers of prepared auto restart action launching.
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 I section of bus-bar fault of 110kV, No. 1 electric power incoming line protection all starts with section switch protection；No. 1 power protection starts and 110kV On I section of bus, outlet protection does not starts (on II section of bus of 110kV, outlet protects not faults not start), I section of mother of 110kV Line compound voltage lockout condition is open, or section switch protection start after after the time delay t time, locking 110 prepared auto restart actions Start the combined floodgate of section switch.
No. 3.2 power circuit breakers, section switches run, 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, No. 2 power protections start and on II section of bus of 110kV outlet protection do not open Dynamic (on I section of bus of 110kV, outlet protects not faults not start), II section of bus compound voltage lockout condition of 110kV are opened Put, after the time delay t time, start No. 1 power circuit breaker of locking prepared auto restart close a floodgate.
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, No. 2 power protections start and outlet protection, 110kV on II section of bus of 110kV On I section of bus, outlet protection does not starts, II section of bus compound voltage lockout condition of 110kV opens, and starts after the time delay t time No. 1 power circuit breaker of locking prepared auto restart closes a floodgate.
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, outlet protection act on I section of bus of 110kV Section switch is closing position simultaneously, the locking combined floodgate of 110 No. 1 power circuit breakers of prepared auto restart action launching.
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, on II section of bus of 110kV, outlet protection is dynamic Make, the locking combined floodgate of 110 No. 1 power circuit breakers of prepared auto restart action launching.
Break down between 3.5 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 I section of bus-bar fault of 110kV, No. 2 electric power incoming line protections all start with section switch protection；No. 2 power protections start and 110kV On II section of bus, outlet protection does not starts (on I section of bus of 110kV, outlet protects not faults not start), 110kV II section Bus compound voltage lockout condition is open, or section switch protection start after after the time delay t time, locking 110 prepared auto restarts move Make to start the combined floodgate of section switch.
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. a 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method, it is characterised in that inlet wire is protected The control condition protecting No. 1 power circuit breaker combined floodgate of action locking prepared auto restart is:
1) there is no the block signal of outlet protection act on I section of bus of 110kV；Outlet protection act on I section of bus of 110kV Block signal condition is: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
The control condition that No. 2 power circuit breakers of incoming relay-protection action locking prepared auto restart close a floodgate is:
1) there is no outlet protection act block signal on II section of bus of 110kV；On II section of bus of 110kV, outlet protection act closes Lock signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start No. 2 power circuit breakers of locking prepared auto restart and close a floodgate；
The control condition that incoming relay-protection action locking prepared auto restart section switch closes a floodgate has 3, is respectively as follows:
Barring condition 1:
1) there is no outlet protection act block signal on I section of bus of 110kV；Outlet protection act locking on I section of bus of 110kV Signal conditioning is: (1) section switch is at closing position；(2) outlet protection act on I section of bus of 110kV；
2) II section of bus compound voltage lockout of 110kV is open；
3) No. 2 electric power incoming line protection act；
4) on II section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 2:
1) there is no outlet protection act block signal on II section of bus of 110kV；On II section of bus of 110kV, outlet protection act closes Lock signal condition is: (1) section switch is at closing position；(2) outlet protection act on II section of bus of 110kV；
2) I section of bus compound voltage lockout of 110kV is open；
3) No. 1 electric power incoming line protection act；
4) on I section of bus of 110kV, outlet protection is not operating；
Above-mentioned 1) when-4) condition is satisfied by, delay time t；
5) section switch is at open position；
When above-mentioned condition 5) meet and after the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
Barring condition 3:
1) section switch protection act, delay time t；
2) section switch is at open position；
After above-mentioned condition meets and the delay time t time arrives, start locking prepared auto restart section switch and close a floodgate；
On I section of bus of described 110kV, outlet protection includes outlet branch protection, transformer differential protection on I section of bus of 110kV With transformator 110kV side back-up protection；On II section of bus of 110kV, outlet protection includes outlet branch road on II section of bus of 110kV Protection, transformer differential protection and transformator 110kV side back-up protection；
Described No. 1 electric power incoming line protection, No. 2 electric power incoming line protections are for by phase distance protection, ground distance protection, direction zero sequence Current protection is constituted.
2. 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method as claimed in claim 1, it is special Levying and be, described No. 1 electric power incoming line protection, No. 2 electric power incoming line protections are for by phase current protection, direction zero-sequence current protection structure Become.
3. 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting 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 protection fixed value adjustings are as follows:
1) phase distance protection, ground distance protection fixed value adjusting:
Phase distance protection, ground distance protection definite value become by escaping electric substation's maximum on this electric substation or 110kV outlet circuit In depressor, low-voltage bus bar short circuit time the minimum impedance setting of measuring of this protection:
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；
2) direction zero-sequence current fixed value adjusting:
Direction zero-sequence current definite value has the >=sensitivity of 1.5 times by system minimum operational mode 110kV bus singlephase earth fault Adjust:
I z d ≤ I k . min ( 1 ) / K l m
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.
4. 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method as claimed in claim 2, it is special Levying and be, described No. 1 electric power incoming line protection and No. 2 electric power incoming line protection fixed value adjustings are as follows:
1) phase current protection definite value by escaping on this electric substation or 110kV outlet circuit in electric substation's maximum transformator, low pressure female The maximum short circuit current flowing through this protection during line short circuit is adjusted:
I z d ≥ K l m I k . m a x ( 3 )
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；
2) direction zero-sequence current fixed value adjusting:
Direction zero-sequence current definite value has the >=sensitivity of 1.5 times by system minimum operational mode 110kV bus singlephase earth fault Adjust:
I z d ≤ I k . m i n ( 1 ) / K l m
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. 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method as claimed in claim 1 or 2, its Being characterised by, described delay time t takes 30 milliseconds.
6. 110kV single-trunk segmental wiring incoming relay-protection locking prepared auto restart relay protecting method as claimed in claim 1 or 2, its Being characterised by, described No. 1 electric power incoming line protection and No. 2 electric power incoming line guard time definite values take 0.05 second.
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