CN106169740B - 110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method - Google Patents
110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method Download PDFInfo
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- CN106169740B CN106169740B CN201610763259.0A CN201610763259A CN106169740B CN 106169740 B CN106169740 B CN 106169740B CN 201610763259 A CN201610763259 A CN 201610763259A CN 106169740 B CN106169740 B CN 106169740B
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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
- H02H7/22—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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Abstract
The invention discloses a kind of 110kV single-trunk segmental wirings incoming relay-protections to be latched prepared auto restart relay protecting method, gives the control condition that the incoming relay-protection control condition that action locking No. 1 power circuit breaker of prepared auto restart closes a floodgate, the control condition that incoming relay-protection action locking No. 2 power circuit breakers of prepared auto restart close a floodgate, incoming relay-protection action locking prepared auto restart section switch close a floodgate.The present invention can occur correctly acting when various 110kV bus-bar faults under the various methods of operation, and locking prepared auto restart closes a floodgate, and prevents prepared auto restart accidentally from throwing on faulty equipment, is conducive to power network safety operation；Under the various methods of operation, when 110kV outlet failures occur, it can not accidentally the action of locking prepared auto restart close a floodgate, improve power grid power supply reliability；Technical scheme of the present invention logic is simple and practicable.
Description
Technical field
The present invention relates to a kind of 110kV single-trunk segmental wirings incoming relay-protections to be latched prepared auto restart relay protecting method, belongs to
Power transmission and distribution network control technology field.
Background technology
Since electric substation's 110kV single-trunk segmental wirings do not install special 110kV bus differential protectings, so using
110kV incoming relay-protections are latched 110kV automatic throw-in equipment of emergency power supplies (abbreviation prepared auto restart) as 110kV bus protections.
110kV incoming relay-protections are latched 110kV prepared auto restart Normal practices：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 acts and sectionalised protection close
Lock the combined floodgate of section switch.When such way has an outlet circuit for II section of busbar of I section of busbar of 110kV or 110kV just not
Adapt to because when outlet line failure, the protection of 110kV electric power incoming lines can not judge 110kV outlets failure or
110kV bus-bar faults.Therefore, the present invention proposes that one kind is closed for electric substation 110kV single-trunk segmental wiring 110kV incoming relay-protections
Lock the Protection Technology scheme of prepared auto restart.
Invention content
The purpose of the present invention is to provide a kind of 110kV single-trunk segmental wirings incoming relay-protections to be latched prepared auto restart relay protection
Method, is applied to electric substation 110kV sectionalized single busbar connection primary connection circuit grids, which only has two power supplys
Inlet wire branch has power supply and outlet branch, transformer branch do not have power supply, the present invention that can occur under the various methods of operation respectively
It is correctly acted when kind 110kV bus-bar faults, locking prepared auto restart closes a floodgate, and prevents prepared auto restart accidentally from throwing on faulty equipment, works as generation
When 110kV outlet failures, can not accidentally the action of locking prepared auto restart it close a floodgate, to improve power grid power supply reliability.
The purpose of the present invention is achieved by the following technical programs：
A kind of 110kV single-trunk segmental wirings incoming relay-protection locking prepared auto restart relay protecting method, incoming relay-protection action are closed
Locking the control condition that No. 1 power circuit breaker of prepared auto restart closes a floodgate is：
1) without the block signal of outlet protection act on I section of busbar of 110kV；Outlet protection act on I section of busbar of 110kV
Block signal condition be：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
Incoming relay-protection action is latched the control condition that No. 2 power circuit breakers of prepared auto restart close a floodgate：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act on II section of busbar of 110kV
Block signal condition is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are in open position；
When above-mentioned condition 5) meet and the delay time t times to after, 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, respectively：
Barring condition 1：
1) there is no outlet protection act block signal on I section of busbar of 110kV；Outlet protection act closes on I section of busbar of 110kV
Lock signal condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 2：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act on II section of busbar of 110kV
Block signal condition is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 3：
1) section switch protection act, delay time t；
2) section switch is in open position；
When above-mentioned condition meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Outlet protection includes outlet branch protection on I section of busbar of 110kV, transformer differential guarantor on I section of busbar of the 110kV
Shield and transformer 110kV side back-up protections；Outlet protection includes outlet branch on II section of busbar of 110kV on II section of busbar of 110kV
Protection, transformer differential protection and transformer 110kV side back-up protections；
No. 1 electric power incoming line protection, No. 2 electric power incoming line protections is by phase distance protection, ground distance protection, directions
Zero-sequence current protection is constituted.
The purpose of the present invention can also be further realized by following technical measures：
Aforementioned 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, No. 1 electric power incoming line
Protection, No. 2 electric power incoming line protections are to be made of phase current protection, direction zero-sequence current protection.
Aforementioned 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, wherein No. 1 electric power incoming line
Protection and No. 2 electric power incoming lines protect fixed value adjusting 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 circuits electric substation most
This protection is minimum in big transformer, when low-voltage bus bar short circuit measures impedance setting：
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, 0.7-0.8, Z are generally takenLFor line impedance；When the parameter for taking this electric substation
Z when calculatingLIt is 0；ZbFor transformer impedance；
2) direction zero-sequence current fixed value adjusting：
Direction zero-sequence current definite value is had >=1.5 times of spirit by system minimum operational mode 110kV busbar singlephase earth faults
Sensitivity is adjusted：
In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, generally takes 1.5.
Aforementioned 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, wherein No. 1 electric power incoming line
Protection and No. 2 electric power incoming lines protect fixed value adjusting as follows：
1) phase current protection definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, it is low
The maximum short circuit current that this protection is flowed through when pressing busbar short-circuit is adjusted：
In above formula,It is maximum for electric substation in this electric substation under system maximum operational mode or 110kV outlet circuits
The maximum short circuit current of this protection, K are flowed through in transformer, when low-voltage bus bar short circuitkFor safety factor, 1.3-1.5 is generally taken；
2) direction zero-sequence current fixed value adjusting：
Direction zero-sequence current definite value is had >=1.5 times of spirit by system minimum operational mode 110kV busbar singlephase earth faults
Sensitivity is adjusted：
In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, generally takes 1.5.
Aforementioned 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, to prevent electric power incoming line
Protection is vied each other with outlet protection act causes to protect accidentally locking prepared auto restart action to be closed a floodgate, and wherein delay time t takes 30 milliseconds.
Aforementioned 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, wherein No. 1 electric power incoming line
The time definite value of protection and the protection of No. 2 electric power incoming lines takes 0.05 second.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention can occur correctly acting when various 110kV bus-bar faults under the various methods of operation, locking is standby certainly
Cater to lock, prevents prepared auto restart accidentally from throwing on faulty equipment, be conducive to power network safety operation；
2. the present invention is under the various methods of operation, when 110kV outlet failures occur, can not accidentally the action of locking prepared auto restart close
Lock improves power grid power supply reliability；
3. technical scheme of the present invention logic is simple and practicable.
Description of the drawings
Fig. 1 is 110kV electric substations sectionalized single busbar connection primary connection circuit figure；
Fig. 2 is 220kV electric substations 110kV double-bus (sectionalized single busbar connection) primary connection circuit figure；
Fig. 3 is that 110kV incoming relay-protections are latched prepared auto restart schematic diagram.
Symbol description is as follows in figure：
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；
Indicate t milliseconds of delay time；
It is expressed as opposite with input signal.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
This programme meets following primary connection circuit：
(1) 110kV electric substations 110kV sectionalized single busbar connection primary connection circuits；
(2) 220kV electric substations 110kV double-bus primary connection circuits；
(3) 220kV electric substations 110kV sectionalized single busbar connection primary connection circuits.
It is once led as shown in Figure 1, the transmission and distribution networks that the method for the present invention is applied are electric substation's 110kV sectionalized single busbar connections
Wiring system network.The 110kV system primary connection circuits of the transmission and distribution networks include：No. 1 electric power incoming line spacing devices, No. 2
Electric power incoming line spacing devices are separately connected II section of I section of busbar of 110kV, 110kV busbar；Between I section of busbar of 110kV and II section of busbar
There is section switch, and is serially connected with segmented current mutual inductor (hereinafter referred to as CT)；No. 1 electric power incoming line spacing devices, No. 2 power supplys into
Line spacing devices have lead-in circuit breaker, and are serially connected with CT；In addition, I section of busbar of 110kV and section busbar are connected to 110kV busbar voltages
Mutual inductor, I section of busbar of 110kV are further connected with No. 1 transformer branch, No. 2 transformer branches, No. 1 110kV outlets branch and 110kV
Voltage transformer (hereinafter referred to as PT)；II section of busbar of 110kV be further connected with No. 3 transformer branches, No. 2 110kV outlets branches and
110kV PT.The technical program can also be used for 220kV electric substations 110kV double-bus (sectionalized single busbar connection) master as shown in Figure 2 and connect
Line.
It is used due to the 110kV side bus protection not configured for above-mentioned 110kV sectionalized single busbar connections primary connection circuit
The protection of electric power incoming line breaker to the bus-bar fault lock-out schemes of 110kV prepared auto restarts, the program for 110kV I section of busbar or
II section of busbar of 110kV has and cannot be adapted to when outlet circuit, because when outlet line failure, 110kV electric power incoming lines are protected
Shield can not judge 110kV line faults or 110kV bus-bar faults.It is necessary to propose a kind of new to be directed to single-trunk segmental wiring
110kV electric substations 110kV incoming relay-protections are latched the Protection Technology scheme of prepared auto restart to meet live service requirement.Such as Fig. 3
It is shown 110kV incoming relay-protections locking prepared auto restart schematic diagram, 110kV single-trunk segmental wiring incoming relay-protections of the invention locking is standby
Relay protecting method is hauled oneself willingly into, the control condition that incoming relay-protection action locking No. 1 power circuit breaker of prepared auto restart closes a floodgate is：
1) without the block signal of outlet protection act on I section of busbar of 110kV；Outlet protection act on I section of busbar of 110kV
Block signal condition be：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
Incoming relay-protection action is latched the control condition that No. 2 power circuit breakers of prepared auto restart close a floodgate：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act on II section of busbar of 110kV
Block signal condition is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are in open position；
When above-mentioned condition 5) meet and the delay time t times to after, 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, respectively：
Barring condition 1：
1) there is no outlet protection act block signal on I section of busbar of 110kV；Outlet protection act closes on I section of busbar of 110kV
Lock signal condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 2：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act on II section of busbar of 110kV
Block signal condition is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 3：
1) section switch protection act, delay time t；
2) section switch is in open position；
When above-mentioned condition meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
On I section of busbar of the 110kV outlet protection mean outlet protection on I section of busbar of 110kV, transformer differential protection and
Transformer 110kV side back-up protections；Outlet protection means outlet protection, transformation on II section of busbar of 110kV on II section of busbar of 110kV
Device differential protection and transformer 110kV side back-up protections；
No. 1 electric power incoming line protection, No. 2 electric power incoming line protections is by phase distance protection, ground distance protection, directions
Zero-sequence current protection is constituted, or is made of phase current protection, direction zero-sequence current protection.
No. 1 electric power incoming line protection and No. 2 electric power incoming lines protect fixed value adjusting 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 circuits electric substation most
This protection is minimum in big transformer, when low-voltage bus bar short circuit measures impedance setting：
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, 0.7-0.8, Z are generally takenLFor line impedance；When the parameter for taking this electric substation
Z when calculatingLIt is 0；ZbFor transformer impedance；
2) direction zero-sequence current fixed value adjusting：
Direction zero-sequence current definite value is had >=1.5 times of spirit by system minimum operational mode 110kV busbar singlephase earth faults
Sensitivity is adjusted：
In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitive system
Number, generally takes 1.5.
3) phase current protection definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, it is low
The maximum short circuit current that this protection is flowed through when pressing busbar short-circuit is adjusted：
In above formula,It is maximum for electric substation in this electric substation under system maximum operational mode or 110kV outlet circuits
The maximum short circuit current of this protection, K are flowed through in transformer, when low-voltage bus bar short circuitkFor safety factor, 1.3-1.5 is generally taken；
Cause to protect accidentally locking prepared auto restart action to be closed a floodgate to prevent electric power incoming line protection from vying each other with outlet protection act,
Wherein delay time t takes 30 milliseconds.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 and protection act process and implementation result of the method for the present invention is given below：
No. 1.1 power circuit breakers, No. 2 power circuit breaker operations, section switch stand-by heat
1.1 I section of 110kV bus-bar faults
Because of No. 1 power circuit breaker, No. 2 power circuit breaker operations, 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 busbar of 110kV outlet protection do not start
I section of (faults do not start yet for outlet protection on II section of busbar of 110kV), 110kV busbar compound voltage lockout condition open,
Start locking prepared auto restart section switch after the t times that are delayed to close a floodgate.
1.2 II section of 110kV bus-bar faults
Because of No. 1 power circuit breaker, No. 2 power circuit breaker operations, 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 busbar of 110kV outlet protection do not start
II section of (faults do not start yet for outlet protection on I section of busbar of 110kV), 110kV busbar compound voltage lockout condition open,
Start locking prepared auto restart section switch after the t times that are delayed to close a floodgate.
Outlet line fault on 1.3 I section of 110kV busbares
Because of No. 1 power circuit breaker, No. 2 power circuit breaker operations, section switch stand-by heat, i.e. section switch separating brake
Position.When outlet circuit (or transformer) failure on I section of busbar of 110kV, outlet protection act on I section of busbar of 110kV, locking
The combined floodgates of 110 prepared auto restart action launching section switches.
Outlet line fault on 1.4 II section of 110kV busbares
Because of No. 1 power circuit breaker, No. 2 power circuit breaker operations, section switch stand-by heat, i.e. section switch separating brake
Position.When outlet circuit (or transformer) failure on II section of busbar of 110kV, outlet protection act on II section of busbar of 110kV closes
The combined floodgate of 110 prepared auto restart action launching section switches is locked.
It breaks down between 1.5 section switches and segmentation CT
Because of No. 1 power circuit breaker, No. 2 power circuit breaker operations, section switch stand-by heat, i.e. section switch separating brake
Position.It breaks down when between section switch and segmentation CT, since segmentation CT is located at I section of bus bar side of 110kV, is equivalent to
I section of bus-bar fault of 110kV, No. 1 electric power incoming line protection start with section switch protection；No. 1 power protection starts and 110kV
Outlet protection does not start I section of (faults do not start yet for outlet protection on II section of busbar of 110kV), 110kV mother on I section of busbar
Line compound voltage lockout condition opens or section switch is protected after starting and is delayed after the t times, and it is dynamic to be latched 110kV prepared auto restarts
Make the combined floodgate of startup section switch.
No. 2.1 power circuit breakers, section switch operation, No. 2 power circuit breaker stand-by heats
2.1 I section of 110kV bus-bar faults
Because No. 1 power circuit breaker, section switch are 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 busbar of 110kV outlet protection do not start
I section of (faults do not start yet for outlet protection on II section of busbar of 110kV), 110kV busbar compound voltage lockout condition open,
Start locking No. 2 power circuit breakers of prepared auto restart after the t times that are delayed to close a floodgate.
2.2 II section of 110kV bus-bar faults
Because No. 1 power circuit breaker, section switch are 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 busbar of 110kV outlet protection do not start
I section of (faults do not start yet for outlet protection on II section of busbar of 110kV), 110kV busbar compound voltage lockout condition open,
Start locking No. 2 power circuit breakers of prepared auto restart after the t times that are delayed to close a floodgate.
Outlet line fault on 2.3 I section of 110kV busbares
Because No. 1 power circuit breaker, section switch are run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When outlet circuit (or transformer) failure on I section of busbar of 110kV, outlet protection act on I section of busbar of 110kV,
It has been latched the combined floodgate of 110kV prepared auto restarts No. 2 power circuit breakers of action launching.
Outlet line fault on 2.4 II section of 110kV busbares
Because No. 1 power circuit breaker, section switch are run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.When outlet circuit (or transformer) failure on II section of busbar of 110kV, outlet protection is dynamic on II section of busbar of 110kV
It is closing position to make section switch simultaneously, has been latched the combined floodgate of 110 No. 2 power circuit breakers of prepared auto restart action launching.
It breaks down between 2.5 section switches and segmentation CT
Because No. 1 power circuit breaker, section switch are run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.It breaks down when between section switch and segmentation CT, since segmentation CT is located at I section of bus bar side of 110kV, is equivalent to
I section of bus-bar fault of 110kV, No. 1 electric power incoming line protection start with section switch protection；No. 1 power protection starts and 110kV
Outlet protection does not start I section of (faults do not start yet for outlet protection on II section of busbar of 110kV), 110kV mother on I section of busbar
Line compound voltage lockout condition opens or section switch is protected after starting and is delayed after the t times, has been latched the action of 110 prepared auto restarts
Start the combined floodgate of section switch.
No. 3.2 power circuit breakers, section switch operation, No. 1 power circuit breaker stand-by heat
3.1 I section of 110kV bus-bar faults
Because No. 2 power circuit breakers, section switch are 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 busbar of 110kV outlet protection also do not open
II section of dynamic (faults do not start yet for outlet protection on I section of busbar of 110kV), 110kV busbar compound voltage lockout condition are opened
It puts, starts locking No. 1 power circuit breaker of prepared auto restart after the t times that are delayed and close a floodgate.
3.2 II section of bus-bar fault of 110kV
Because No. 2 power circuit breakers, section switch are 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 busbar of 110kV
Outlet protection does not start on I section of busbar, II section of busbar compound voltage lockout condition of 110kV opens, and starts after being delayed the t times
No. 1 power circuit breaker of prepared auto restart is latched to close a floodgate.
Outlet line fault on 3.3 I section of 110kV busbares
Because No. 2 power circuit breakers, section switch are run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When outlet circuit (or transformer) failure on I section of busbar of 110kV, outlet protection act on I section of busbar of 110kV
Section switch is closing position simultaneously, has been latched the combined floodgate of 110 No. 1 power circuit breakers of prepared auto restart action launching.
Outlet line fault on 3.4 II section of 110kV busbares
Because No. 2 power circuit breakers, section switch are run, No. 1 power circuit breaker stand-by heat, i.e. No. 1 power circuit breaker
Open position.When outlet circuit (or transformer) failure on II section of busbar of 110kV, outlet protection is dynamic on II section of busbar of 110kV
Make, has been latched the combined floodgate of 110 No. 1 power circuit breakers of prepared auto restart action launching.
It breaks down between 3.5 section switches and segmentation CT
Because No. 1 power circuit breaker, section switch are run, No. 2 power circuit breaker stand-by heats, i.e. No. 2 power circuit breakers
Open position.It breaks down when between section switch and segmentation CT, since segmentation CT is located at I section of bus bar side of 110kV, is equivalent to
I section of bus-bar fault of 110kV, No. 2 electric power incoming line protections start with section switch protection；No. 2 power protections start and 110kV
Outlet protection does not start (faults do not start yet for outlet protection on I section of busbar of 110kV), II section of 110kV on II section of busbar
Busbar compound voltage lockout condition opens or section switch is protected after starting and is delayed after the t times, and it is dynamic to be latched 110 prepared auto restarts
Make the combined floodgate of startup section switch.
In addition to the implementation, the present invention can also have other embodiment, 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 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, which is characterized in that inlet wire is protected
Shield action is latched the control condition that No. 1 power circuit breaker of prepared auto restart closes a floodgate：
1) without the block signal of outlet protection act on I section of busbar of 110kV；Outlet protection act closes on I section of busbar of 110kV
Lock signal condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 1 power circuit breaker is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；
Incoming relay-protection action is latched the control condition that No. 2 power circuit breakers of prepared auto restart close a floodgate：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act is latched on II section of busbar of 110kV
Signal conditioning is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) No. 2 power circuit breakers are in open position；
When above-mentioned condition 5) meet and the delay time t times to after, 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, respectively：
Barring condition 1：
1) there is no outlet protection act block signal on I section of busbar of 110kV；Outlet protection act locking letter on I section of busbar of 110kV
Number condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；
2) II section of busbar compound voltage lockout of 110kV opens；
3) No. 2 electric power incoming line protection acts；
4) outlet protection is not operating on II section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 2：
1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act is latched on II section of busbar of 110kV
Signal conditioning is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；
2) I section of busbar compound voltage lockout of 110kV opens；
3) No. 1 electric power incoming line protection act；
4) outlet protection is not operating on I section of busbar of 110kV；
Above-mentioned 1) -4) when condition is satisfied by, delay time t；
5) section switch is in open position；
When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
Barring condition 3：
1) section switch protection act, delay time t；
2) section switch is in open position；
When above-mentioned condition meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；
On I section of busbar of the 110kV outlet protection include outlet branch protection on I section of busbar of 110kV, transformer differential protection and
Transformer 110kV side back-up protections；On II section of busbar of 110kV outlet protection include outlet branch protection on II section of busbar of 110kV,
Transformer differential protection and transformer 110kV side back-up protections；
No. 1 electric power incoming line protection, No. 2 electric power incoming line protections is by phase distance protection, ground distance protection, direction zero sequences
Current protection is constituted, or is made of phase current protection, direction zero-sequence current protection.
2. 110kV single-trunk segmental wirings incoming relay-protection as described in claim 1 is latched prepared auto restart relay protecting method, special
Sign is that No. 1 electric power incoming line protection and No. 2 electric power incoming lines protect fixed value adjusting as follows：
1) phase distance protection, ground distance protection fixed value adjusting：
Phase distance protection, ground distance protection definite value become by electric substation's maximum on this electric substation or 110kV outlet circuits is escaped
This protection is minimum in depressor, when low-voltage bus bar short circuit measures impedance setting：
Zzd≤KKZL+KKbZb
K in above formulaK、KKbFor safety factor, 0.7-0.8, Z are takenLFor line impedance；The Z when the parameter for taking this electric substation calculatesL
It is 0；ZbFor transformer impedance；
2) direction zero-sequence current fixed value adjusting：
Direction zero-sequence current definite value is had >=1.5 times of sensitivity by system minimum operational mode 110kV busbar singlephase earth faults
It adjusts：
In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, take
1.5；
3) phase current protection definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, low pressure it is female
The maximum short circuit current that this protection is flowed through when line 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 circuits
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.
3. 110kV single-trunk segmental wirings incoming relay-protection as claimed in claim 1 or 2 is latched prepared auto restart relay protecting method,
It is characterized in that, the delay time t takes 30 milliseconds.
4. 110kV single-trunk segmental wirings incoming relay-protection as claimed in claim 1 or 2 is latched prepared auto restart relay protecting method,
It is characterized in that, the time definite value of No. 1 electric power incoming line protection and the protection of No. 2 electric power incoming lines takes 0.05 second.
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| CN201610763259.0A CN106169740B (en) | 2016-08-29 | 2016-08-29 | 110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method |
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| CN201610763259.0A CN106169740B (en) | 2016-08-29 | 2016-08-29 | 110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method |
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