CN106207985B - Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method - Google Patents
Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method Download PDFInfo
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- CN106207985B CN106207985B CN201610770911.1A CN201610770911A CN106207985B CN 106207985 B CN106207985 B CN 106207985B CN 201610770911 A CN201610770911 A CN 201610770911A CN 106207985 B CN106207985 B CN 106207985B
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Abstract
The invention discloses a kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protections to be latched spare power automatic switching method; for 110kV sectionalized single busbar connection primary connection circuits; configure 110kV bus differential protectings and the protection of 110kV electric power incoming lines; it realizes 110kV bus differential protectings and assistant criteria is used as using electric power incoming line protection; prepared auto restart is latched to 110kV bus-bar faults, to meet live service requirement.The present invention can correctly act locking prepared auto restart action using the scheme of electric substation's 110kV bus differential protections locking prepared auto restart under the various methods of operation and close a floodgate when each 110kV bus-bar faults; it prevents prepared auto restart accidentally from throwing on faulty equipment, is conducive to power network safety operation.The present invention can accidentally can not be closed a floodgate under the various methods of operation when 110kV outlets failure, improve power grid power supply reliability in the action of locking prepared auto restart using the scheme of electric substation's 110kV bus differential protections locking prepared auto restart.Logic of the present invention is simple and practicable.
Description
Technical field
The present invention relates to the single-trunk segmental wiring 110kV bus differential protections lockings that a kind of inlet wire of substation protects subsidiary discriminant
The relay protecting method of prepared auto restart, the invention belongs to power transmission and distribution network control technology fields.
Background technology
At present since single-trunk segmental wiring 110kV electric substations do not install special 110kV bus differential protectings, so
It is protected using 110kV electric power incoming lines (referred to as standby to be latched 110kV automatic throw-in equipment of emergency power supplies as 110kV bus protections
It hauls oneself willingly into).110kV incoming relay-protections locking 110kV prepared auto restart schemes have the following problems：1. for I section of busbar of 110kV or 110kV
When II section of busbar has outlet circuit, in outlet line failure, 110kV electric power incoming lines protection protection can not judge be
110kV line faults or 110kV bus-bar faults；2. when two bus runs of electric power incoming line band all the way, sent out in any busbar
The protection of 110kV electric power incoming lines can not judge II section of bus-bar fault of I section of bus-bar fault of 110kV or 110kV under raw fault condition.
Above-mentioned two problems are that 110kV electric power incoming line protection blocking 110kV prepared auto restarts have more insoluble problem, and use
110kV bus differential protections locking prepared auto restart can overcome the above problem.But single-trunk segmental wiring 110kV electric substations install 110kV
After bus differential protection, how it to be latched prepared auto restart, is the new issue that relay protection staff faces.The present invention will propose that one kind is directed to
Inlet wire of substation protects the relay protection of the 110kV single-trunk segmental wiring 110kV bus differential protections locking prepared auto restart of subsidiary discriminant
Technical solution.
Invention content
The purpose of the present invention is to provide a kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protections to be latched prepared auto restart
Method configures 110kV bus differential protectings and the protection of 110kV electric power incoming lines for 110kV sectionalized single busbar connection primary connection circuits,
Realization 110kV bus differential protectings simultaneously use electric power incoming line protection to be used as assistant criteria, to the locking of 110kV bus-bar faults for certainly
It throws, to meet live 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 differential protection action jump I
Section busbar breaker is latched the control condition that No. 1 power circuit breaker closes a floodgate simultaneously：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
Bus differential protection action jumps II section of busbar breaker control condition that No. 2 power circuit breakers of locking close a floodgate simultaneously：
Meet condition 1：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition is satisfied by, bus differential protection action jumps II section of busbar breaker and is latched No. 2 power circuit breakers simultaneously
It closes a floodgate；
Or meet condition 2：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position.
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 2 power circuit breakers conjunctions simultaneously
Lock；
Bus differential protection action is latched the control condition that section switch closes a floodgate：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 incoming relay-protection actions；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 3：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 4：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 5：
(1) the big differential relay action of the female differences of 110kV；
(2) I section of busbar compound voltage lockout of 110kV is open or II section of busbar compound voltage lockout of 110kV opens；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously.
The purpose of the present invention can also be further realized by following technical measures：
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively that the inlet wire on the incoming relay-protection and No. 2 lead-in circuit breaker CT being mounted on No. 1 lead-in circuit breaker CT is protected
Shield at least configures one section of direction phase distance protection, one section of direction ground distance protection, one section of direction zero-sequence current protection；On
The direction for stating protection directional element 110kV busbares are directed toward by 110kV circuits.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively that the inlet wire on the incoming relay-protection and No. 2 lead-in circuit breaker CT being mounted on No. 1 lead-in circuit breaker CT is protected
Shield at least configures one section of direction phase current protection, one section of direction zero-sequence current protection；The direction of above-mentioned protection directional element by
110kV circuits are directed toward 110kV busbares.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method, and wherein phase spacing is protected
Shield, ground distance protection fixed value adjusting method are：
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；
Wherein phase current protection fixed value adjusting method be：
Phase current protect definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, low pressure
The maximum short circuit current that this protection is flowed through when 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；
Wherein direction zero-sequence current fixed value adjusting method is：
Direction zero-sequence current definite value has >=1.5 times by 110kV busbar singlephase earth faults under system minimum operational mode
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 incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method, No. 1 electric power incoming line
Protection and No. 2 electric power incoming line guard time definite values take 0.05-0.10 seconds.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention can be under the various methods of operation respectively using the scheme of electric substation's 110kV bus differential protections locking prepared auto restart
Correctly the action of action locking prepared auto restart is closed a floodgate when 110kV bus-bar faults, is prevented prepared auto restart accidentally from throwing on faulty equipment, is conducive to
Power network safety operation.
2. the present invention can be under the various methods of operation using the scheme of electric substation's 110kV bus differential protections locking prepared auto restart
When 110kV outlet failures, it can not accidentally the action of locking prepared auto restart close a floodgate, improve power grid power supply reliability.
3. logic of the present invention 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 primary connection circuit figures；
Fig. 3 is that 110kV bus differential protectings 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.
Specific implementation mode
The present invention is applied to 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.
The application conditions of technical solution of the present invention are：The female poor branch of only two power supplys has a power supply and outlet branch, transformer
Branch does not have power supply.
The invention will be further described in the following with reference to the drawings and specific embodiments.
The transmission and distribution networks that the method for the present invention is applied are electric substation 110kV sectionalized single busbar connection primary connection circuit system networks
Network.As shown in Figure 1, 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 3DL, and is serially connected with segmented current mutual inductor 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；In addition, I section of busbar of 110kV and II section of busbar connect respectively
Have bus-bar potential transformer PT1, PT2, I section of busbar of 110kV be further connected with No. 1 transformer branch, No. 2 transformer branches, No. 1
110kV outlet branches；II section of busbar of 110kV is further connected with No. 3 transformer branches, No. 2 110kV outlet branches.Fig. 2 becomes for 220kV
Electric institute 110kV double-bus primary connection circuit figure, can also apply the technical scheme of the present invention.
For above-mentioned 110kV sectionalized single busbar connections primary connection circuit electricity is used since the 110kV side bus of configuration is protected
The female poor breaker in source protects the bus-bar fault lock-out scheme to 110kV prepared auto restarts, and is sentenced as auxiliary using electric power incoming line protection
According to.As shown in figure 3, being latched prepared auto restart schematic diagram for 110kV bus differential protectings.The incoming relay-protection subsidiary discriminant list of the present invention is female
Line is segmented bus differential protection and is latched spare power automatic switching method, and bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker simultaneously
The control condition of combined floodgate is：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker conjunction simultaneously
Lock；
Bus differential protection action jumps II section of busbar breaker control condition that No. 2 power circuit breakers of locking close a floodgate simultaneously：
Meet condition 1：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition is satisfied by, bus differential protection action jumps II section of busbar breaker and is latched No. 2 power circuit breakers simultaneously
It closes a floodgate；
Or meet condition 2：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position.
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 2 power circuit breakers conjunctions simultaneously
Lock；
Bus differential protection action is latched the control condition that section switch closes a floodgate：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 incoming relay-protection actions；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 3：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 4：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 5：
(1) the big differential relay action of the female differences of 110kV；
(2) I section of busbar compound voltage lockout of 110kV is open or II section of busbar compound voltage lockout of 110kV opens；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively that the inlet wire on the incoming relay-protection and No. 2 lead-in circuit breaker CT being mounted on No. 1 lead-in circuit breaker CT is protected
Shield at least configures one section of direction phase distance protection, one section of direction ground distance protection, one section of direction zero-sequence current protection；On
The direction for stating protection directional element 110kV busbares are directed toward by 110kV circuits.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method, No. 1 incoming relay-protection,
No. 2 incoming relay-protections are respectively that the inlet wire on the incoming relay-protection and No. 2 lead-in circuit breaker CT being mounted on No. 1 lead-in circuit breaker CT is protected
Shield at least configures one section of direction phase current protection, one section of direction zero-sequence current protection；The direction of above-mentioned protection directional element by
110kV circuits are directed toward 110kV busbares.
Aforementioned incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method, and wherein phase spacing is protected
Shield, ground distance protection fixed value adjusting method are：
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；
Wherein phase current protection fixed value adjusting method be：
Phase current protect definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, low pressure
The maximum short circuit current that this protection is flowed through when 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；
Wherein direction zero-sequence current fixed value adjusting method is：
Direction zero-sequence current definite value has >=1.5 times by 110kV busbar singlephase earth faults under system minimum operational mode
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 incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method, No. 1 electric power incoming line
Protection and No. 2 electric power incoming line guard time definite values take 0.05-0.10 seconds.
The work operational process of the embodiment (by taking Fig. 2 as an example) of the method for the present invention is given below：
1. when No. 1 power circuit breaker, 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, I section of big differential relay startup of the female difference of No. 1 incoming relay-protection, 110kV, 110kV busbar
Compound voltage lockout condition opens, and bus differential protection action jumps I section of busbar breaker and is latched section switch combined floodgate simultaneously.
Or when I section of bus-bar fault of 110kV, I section of big differential relay startup of the female differences of 110kV, 110kV busbar composite voltage
Barring condition opens, and bus differential protection action is latched section switch and closes 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, II section of big differential relay startup of the female difference of No. 2 incoming relay-protections, 110kV, 110kV mother
Line compound voltage lockout condition opens, and bus differential protection action jumps II section of busbar breaker and is latched section switch combined floodgate simultaneously.
Or when II section of bus-bar fault of 110kV, II section of big differential relay startup of the female differences of 110kV, 110kV busbar compound electric
Barring condition is pressed to open, bus differential protection action is latched section switch and closes 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, the big differential relay of 110kV bus differential protections is reflected as
External area error is so will not start, therefore will not be latched 110 prepared auto restarts.
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, the big differential relay reflection of 110kV bus differential protections
For external area error so will not start, therefore 110 prepared auto restarts will not be latched.
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, so, the big differential relay of the female difference of No. 1 incoming relay-protection, 110kV starts, I section of busbar of 110kV is compound
Voltage blocking condition opens, and bus differential protection action jumps I section of busbar breaker and is latched section switch combined floodgate simultaneously.
2. when No. 1 power circuit breaker, section switch are run, 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, small differential relay, the 110kV of I section of busbar meter of 110kV and segmented current are female
Poor big differential relay starts, I section of busbar compound voltage lockout condition of 110kV opens, and bus differential protection action jumps I section of busbar open circuit
Device and section switch close a floodgate；In the case due to female difference, it is not latched the closing circuit of No. 2 power circuit breakers of prepared auto restart,
So prepared auto restart still can start No. 2 power circuit breakers and close a floodgate, II section of busbar prepared auto restart of 110kV is made to be supplied to No. 2 electric power incoming lines
Electricity.
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, small differential relay, the 110kV of II section of busbar meter of 110kV and segmented current
Female big differential relay of difference starts, II section of busbar compound voltage lockout condition of 110kV opens, and bus differential protection action jumps II section of busbar
Breaker, section switch, while it being latched the combined floodgate that prepared auto restart starts No. 2 power circuit breakers, it ensure that I section of busbar of 110kV
Power supply.
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, the big differential relay of 110kV bus differential protections is anti-
Reflecting will not start for external area error is all, therefore will not be latched 110 prepared auto restarts.
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, the big differential relay of 110kV bus differential protections
It is reflected as that external area error is all to be started, therefore 110 prepared auto restarts will not be latched.
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
The big differential relay of the female difference of small differential relay, 110kV of II section of bus-bar fault of 110kV, II section of busbar meter of 110kV and segmented current
Device starts, II section of busbar compound voltage lockout condition of 110kV opens, and bus differential protection action jumps II section of busbar breaker and segmentation is disconnected
Road device, while being latched the combined floodgate that prepared auto restart starts No. 2 power circuit breakers.After section switch tripping, failure still remains, at this time
No. 1 incoming relay-protection and the big differential relay of the female differences of 110kV start, I section of busbar compound voltage lockout condition of 110kV opens, female poor
Protection act jumps I section of busbar breaker.
3. when No. 2 power circuit breakers, section switch are run, No. 1 power circuit breaker stand-by heat
3.1110kV I section of bus-bar fault
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, small differential relay, the 110kV of I section of busbar meter of 110kV and segmented current are female
Poor big differential relay starts, I section of busbar compound voltage lockout condition of 110kV opens, and bus differential protection action jumps I section of busbar open circuit
Device and section switch close a floodgate, while being latched the combined floodgate that prepared auto restart starts No. 1 power circuit breaker, ensure that II section of mother of 110kV
The power supply of line.
3.2 II 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 II section of bus-bar fault of 110kV, when II section of bus-bar fault of 110kV, II section of busbar meter of 110kV and segmentation electricity
The big differential relay of the female difference of small differential relay, 110kV of stream starts, II section of busbar compound voltage lockout condition of 110kV opens,
Bus differential protection action jumps II section of busbar breaker, section switch；In the case due to female difference, prepared auto restart 1 it is not latched
The closing circuit of power circuit breaker, so, prepared auto restart still can start No. 1 power circuit breaker and close a floodgate, and keep II section of busbar of 110kV standby
It powers from No. 1 electric power incoming line is thrown into.
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, the big differential relay of 110kV bus differential protections is anti-
Reflecting will not start for external area error is all, therefore will not be latched 110 prepared auto restarts.
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, the big differential relay of 110kV bus differential protections
It is reflected as that external area error is all to be started, therefore 110 prepared auto restarts will not be latched.
It breaks down between 3.5 section switches and segmentation CT
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.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
The big differential relay of the female difference of small differential relay, 110kV of II section of bus-bar fault of 110kV, II section of busbar meter of 110kV and segmented current
Device starts, II section of busbar compound voltage lockout condition of 110kV opens, and bus differential protection action jumps II section of busbar breaker and segmentation is disconnected
Road device.At this point, since bus differential protection action at this time is not latched the combined floodgate of No. 1 power circuit breaker of prepared auto restart, therefore No. 1 electric power incoming line is disconnected
Road device closes a floodgate, and I section of busbar of 110kV is powered from No. 1 electric power incoming line is thrown into, but fault point still remains, after section switch tripping,
No. 2 electric power incoming line protections and the big differential relay of the female differences of 110kV start, I section of busbar compound voltage lockout condition of 110kV opens,
Bus differential protection acts I section of busbar breaker of tripping again.
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 (6)
1. a kind of incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method, which is characterized in that female difference is protected
I section of busbar breaker control condition that No. 1 power circuit breaker of locking closes a floodgate simultaneously is jumped in shield action：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker combined floodgate simultaneously；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 1 power circuit breaker combined floodgate simultaneously；
Bus differential protection action jumps II section of busbar breaker control condition that No. 2 power circuit breakers of locking close a floodgate simultaneously：
Meet condition 1：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition is satisfied by, bus differential protection action jumps II section of busbar breaker and is latched No. 2 power circuit breakers combined floodgates simultaneously；
Or meet condition 2：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action jumps I section of busbar breaker and is latched No. 2 power circuit breakers combined floodgates simultaneously；
Bus differential protection action is latched the control condition that section switch closes a floodgate：
Meet condition 1：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor I section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 2：
(1) I section of busbar compound voltage lockout of 110kV opens；
(2) No. 1 incoming relay-protection actions；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action is latched section switch and closes a floodgate；
Or meet condition 3：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) the big differential relay action of the female differences of 110kV；
(3) the small differential relay action of the female poor II section of busbar score sections of 110kV or mother CT electric currents；
(4) section switch is in closing position；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously；
Or meet condition 4：
(1) II section of busbar compound voltage lockout of 110kV opens；
(2) No. 2 electric power incoming line protection acts；
(3) the big differential relay action of the female differences of 110kV；
(4) section switch is in open position；
After above-mentioned condition meets, bus differential protection action is latched section switch and closes a floodgate；
Or meet condition 5：
(1) the big differential relay action of the female differences of 110kV；
(2) I section of busbar compound voltage lockout of 110kV is open or II section of busbar compound voltage lockout of 110kV opens；
After above-mentioned condition meets, bus differential protection action jumps section switch and is latched section switch combined floodgate simultaneously.
2. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection as described in claim 1 is latched spare power automatic switching method, special
Sign is that No. 1 incoming relay-protection, No. 2 incoming relay-protections are respectively the incoming relay-protection and 2 being mounted on No. 1 lead-in circuit breaker CT
Incoming relay-protection on number lead-in circuit breaker CT, at least configure one section of direction phase distance protection, one section of direction ground distance protection,
One section of direction zero-sequence current protection；The direction of above-mentioned protection directional element 110kV busbares are directed toward by 110kV circuits.
3. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection as described in claim 1 is latched spare power automatic switching method, special
Sign is that No. 1 incoming relay-protection, No. 2 incoming relay-protections are respectively the incoming relay-protection and 2 being mounted on No. 1 lead-in circuit breaker CT
Incoming relay-protection on number lead-in circuit breaker CT at least configures one section of direction phase current protection, one section of direction zero-sequence current protection；On
The direction for stating protection directional element 110kV busbares are directed toward by 110kV circuits.
4. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection as claimed in claim 2 is latched spare power automatic switching method, special
Sign is that the direction phase distance protection, direction ground distance protection fixed value adjusting method are：
Direction phase distance protection, direction ground distance protection definite value are by escaping power transformation on this electric substation or 110kV outlet circuits
This protection minimum measures impedance setting in the maximum transformer of institute, when low-voltage bus bar short circuit：
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；
The direction zero-sequence current fixed value adjusting method is：
Direction zero-sequence current definite value has >=1.5 times sensitive by 110kV busbar singlephase earth faults under system minimum operational mode
Degree is adjusted：
In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, take
1.5。
5. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection as claimed in claim 3 is latched spare power automatic switching method, special
Sign is that the direction phase current protection fixed value adjusting method is：
Direction phase current protection definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, low pressure
The maximum short circuit current that this protection is flowed through when 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 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；
The direction zero-sequence current fixed value adjusting method is：
Direction zero-sequence current definite value has >=1.5 times sensitive by 110kV busbar singlephase earth faults under system minimum operational mode
Degree is adjusted：
In above formula,For 110kV busbares single-phase short circuit current, K under system minimum operational modelmFor sensitivity coefficient, take
1.5。
6. incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection as described in claim 1 is latched spare power automatic switching method, special
Sign is that the time definite value of No. 1 electric power incoming line protection and the protection of No. 2 electric power incoming lines takes 0.05-0.1 seconds.
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| CN109739113B (en) * | 2018-12-30 | 2021-06-22 | 国网北京市电力公司 | Control system, method, storage medium, and processor |
| CN110542827B (en) * | 2019-01-31 | 2020-08-07 | 华北电力大学 | Method and system for judging fault direction of power distribution network containing inverter type power supply |
| CN109861180B (en) * | 2019-04-02 | 2020-10-16 | 国网江苏省电力有限公司镇江供电分公司 | Bus differential protection locking spare power automatic switching protection method for preventing dead zone fault of sectional breaker |
| CN109861181B (en) * | 2019-04-02 | 2020-10-16 | 国网江苏省电力有限公司镇江供电分公司 | Relay protection method for eliminating dead zone faults of sectional and bus-coupled circuit breakers |
| CN109980615B (en) * | 2019-04-02 | 2020-12-01 | 国网江苏省电力有限公司镇江供电分公司 | Relay protection method for eliminating dead zone faults of sectional circuit breaker and bus-tie circuit breaker |
| CN112952993B (en) * | 2021-04-14 | 2023-11-17 | 东方电气(成都)工程设计咨询有限公司 | Dual-power supply spare power automatic switching loop control method based on relay lap joint |
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