CN106998061B - A kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting method - Google Patents
A kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting method Download PDFInfo
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- CN106998061B CN106998061B CN201710190869.0A CN201710190869A CN106998061B CN 106998061 B CN106998061 B CN 106998061B CN 201710190869 A CN201710190869 A CN 201710190869A CN 106998061 B CN106998061 B CN 106998061B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 230000035945 sensitivity Effects 0.000 claims description 11
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
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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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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Abstract
A kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting method, 2 block switches are arranged on 10kV route backbone, 6 kilometers of route is greater than to wherein length, are protected using three-level protective configuration to route.The route distance of three step switch is no less than 2km；The setting position of the second level, third level switch on backbone selects near three branch position of backbone；Protection fixed value adjusting is carried out to first order switch, second level switch and third level switch respectively again, and reclosing is configured.The present invention is on the 10kV radial supply line that 110kV and 220kV powers; it is proposed the three-level protective configuration for being suitable for such route and fixed value adjusting method; and the route of protection definite values at different levels is adjusted according to the above setting method; the complete protection cooperation of line sectionalizing may be implemented; in failure; it is substantially reduced fault coverage, and reclosing is cooperated to be arranged, fault-free region can be restored in the shortest possible time.
Description
Technical field
The present invention relates to a kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting methods, belong to power circuit and match
Set technical field.
Background technique
10 KV line of single supply refers to that only side is connected to substation, and the other side is outside through outlet switch from substation
Extend 10 KV line of power supply.In order to reduce scope of power outage in failure, O&M department generally can be in 10 kilovolts of lines of single supply
Block switch is set, but in practical application, traffic department only carries out adaptive setting to outlet switch, and right on the backbone on road
In block switch definite value there is no unified method carry out adaptive setting, make block switch usually can not be effective with outlet switch
Cooperation, when breaking down on 10kV distribution line, block switch trips simultaneously with substation exit switch, and block switch can not
The effect realized Fault Isolation, reduce scope of power outage.
To improve the mutual cooperation water that 10 kilovolts of distribution lines improve the protections such as outlet switch, block switch and branch switch
It is flat, route protection efficiency of movement is farthest improved, distribution line trip-out rate is reduced, reduces fault outage range, further
Reliability of Power Supplying Net Work is improved, for the 10kV radial supply line that 110kV and 220kV powers, is proposed a kind of suitable for such line
The three-level protective configuration on road and fixed value adjusting method are very necessary.
Summary of the invention
The object of the present invention is to improve outlet switch, block switch and branch switch to improve 10 kilovolts of distribution lines
It waits the mutual cooperation of protections horizontal, farthest improves route protection efficiency of movement, reduce distribution line trip-out rate, reduce event
Hinder scope of power outage, further increase Reliability of Power Supplying Net Work, proposes that a kind of 10 KV line of single supply protection three-level configures and determines
It is worth setting method.
Technical scheme is as follows: a kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting method,
2 block switches are set on 10kV route backbone, 6 kilometers of route is greater than to wherein length, is configured using three-level protective
Route is protected；The route distance of three step switch is no less than 2km；What the second level, the third level on backbone switched sets
Seated position selects near three branch position of backbone；Again respectively to the first order switch, the second level switch and the third level switch into
Row protection fixed value adjusting, and reclosing is configured.
The first order switch protection fixed value adjusting is as follows:
First order switch setting three-stage overcurrent protection, overcurrent I sections of investment, II sections of overcurrent and III sections of overcurrent；Three times
Definite value is respectively set to 0s, 0.4s, 0.6s；
I sections of current ration I of overcurrentczIBy escape the first order switch to the second level switch setting at failure maximum current it is whole
It is fixed, it may be assumed that
IczI≥Kk*Icf.max(3)
Wherein: IczIFor I sections of current rations of outlet switch overcurrent；KkFor safety factor, 1.3 are taken；Icf.max(3)For maximum fortune
The three phase short circuit fault electric current of first order switch setting, I under line modecf.max(3)As following formula calculates:
Wherein: ZxtminFor the equivalent impedance that higher level's power supply system is switched to the first order under maximum mode；ZcfIt is first and second
Grade switch room line impedance minimum value；
Failure minimum current check at outlet switch under minimum mode is pressed in I sections of sensitivity of overcurrent, it may be assumed that
Wherein: Ic.min(2)For two-phase short-circuit fault electric current at outlet switch under minimum operational mode；
KlmFor sensitivity coefficient, 1.0 are taken；When sensitivity is less than 1.0, it can adjust block switch and position be set, to ensure
Sensitivity is not less than 1.0；Ic.min(2)It calculates according to the following formula:
ZxtmaxThe equivalent impedance switched for higher level's power supply system under minimum mode to the first order；
II sections of current ration I of overcurrentczIIIt switchs by the first order is escaped to the maximum fault current adjusting at third level switch,
That is:
IczII≥Kk*Icff.max(3)
Wherein: IczIIFor II sections of current rations of first order switch over-current；KkFor safety factor, 1.3 are taken；Icff.max(3)For most
Three phase short circuit fault electric current under the big method of operation at the setting of third level switch, Icff.max(3)Calculate such as following formula:
Wherein: ZxtminFor the equivalent impedance that higher level's power supply system is switched to the first order under maximum mode；ZcffIt is first and third
Grade switch room line impedance minimum value；
III sections of definite value I of overcurrentczIIIAccording to route maximum load current adjusting of hiding, it may be assumed that
IczIII≥Kk*Iav.max
Wherein: KkFor safety factor, 1.3 are taken；
Iav.maxFor the route maximum load current in annual running mode.
The second level switch protection fixed value adjusting is as follows:
The protection setting two-part protection of second level switch, I sections and overcurrent II sections of overcurrent, time definite value is respectively 0.2s,
0.4s；
II sections of switch over-current I sections of the second level, overcurrent current rations are respectively according to no more than II sections of first order switch over-current, mistake
Flow 0.9 times of adjusting of III sections of current rations；That is:
IfzI≤Kp*IczII
IfzII≤Kp*IczIII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzI、IfzIII sections, II sections electric currents of overcurrent of respectively second level switch are fixed
Value；IczII、IczIIIFor II sections, III sections current rations of overcurrent of first order switch.
The third level switch protection fixed value adjusting is as follows:
Third level switch protection is arranged two-part and protects, and I sections and overcurrent II sections of overcurrent, time definite value is respectively 0s, 0.2s；
Overcurrent I sections of current ration adjusting, II sections of overcurrent are respectively according to no more than I sections of second level switch over-current, II sections of overcurrent
0.9 times of adjusting of current ration；That is:
IfzzI≤Kp*IfzI
IfzzII≤Kp*IfzII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzzI、IfzzIII sections, II sections electric currents of overcurrent of respectively third level switch are fixed
Value；IfzI、IfzIIRespectively I sections, II sections current rations of overcurrent of second level switch.
The reclosing is configured as follows:
To the route of three-level protective configuration, there is the switch of reclosing function, reclosing should be put into, reclosing should match step by step
Set, when failure leads to first order switch trip, below two class protection also tripping, reclosing successively weighs sequentially in time
It closes, the first order protects reclosure time that 2.6s is arranged, and the second level protects reclosing that 4s, third level protection setting 6s is arranged.
The invention has the advantages that the present invention on the 10kV radial supply line that 110kV and 220kV powers, proposes to fit
Three-level protective configuration and fixed value adjusting method for such route, and protection definite values at different levels are adjusted according to the above setting method
The complete protection cooperation of line sectionalizing may be implemented in route, in failure, is substantially reduced fault coverage, and reclosing is cooperated to set
It sets, fault-free region can be restored in the shortest possible time.And according to the action situation of three-level protective, it is easy to Judging fault hair
Radix Rehmanniae point significantly facilitates trouble shoot, shortens trouble shooting time.Above-described three-level protective configuration and fixed value adjusting side
Method, the time that the system of taking full advantage of can be given is differential, in the case where same failure rate, improves system most possibly
Power supply reliability improves the power supply capacity of 10 KV line.
Detailed description of the invention
Fig. 1 is 1110kV (220kV) substation's 10kV line sectionalizing switch setting schematic diagram.
Specific embodiment
A specific embodiment of the invention is as shown in Figure 1.
It is as follows that the present embodiment defines backbone, branch line and switch at different levels:
Backbone: 10kV route is since substation's outlet switch, along the path in each channel to each end, length longest
The line definitions that are passed through of path be backbone.
Branch line: what is separated from backbone on 10kV route extends to the conducting wire of direction least significant end to other directions
Part.
First order switch (protection): 10kV route is connected to the switch i.e. outlet switch of substation bus bar, referred to as the of route
Level-one switch, the protection of the switch are known as first order protection
Second level switch (protection): it is set along first block switch or branch line of current direction on 10kV route main line
Set and first block switch branch switch identical with power transformation distance between sites, the referred to as second level switch.The protection of the switch
Referred to as the second level is protected.
Third level switch (protection): it is set along second block switch or branch line of current direction on 10kV route main line
Set and second block switch branch switch identical with power transformation distance between sites, the referred to as second level switch.The protection of the switch
Referred to as the second level is protected.
Relaying configuration of the present embodiment to 10kV route main trunk line:
2 block switches are set on 10kV route backbone, and distribution network protection is divided into three-level protective, the route of three step switch
Distance no less than 2km.
The setting position of the second level, third level switch on backbone selects near three branch position of backbone (because opening
Pass is typically mounted at shaft tower, it is impossible to just at three branches) or can be by all fronts load substantially trisection, and synthesis is examined
Consider branch line situation to optimize and revise, the block switch of selection should meet technical requirements.
Between first and second grade of switch when You great branch, and the first order switchs to the length of big branches end and is greater than first
Grade, the length of second level switch room, then length is closest at the length between the first secondary switch on the branched line, setting
One switch, which is also second level switch protection.Equally, between second and third grade switch when You great branch, and the first order
It switchs to the length of big branches end greater than the length between the first order, three step switch, then length is closest on the branched line
At the length of first and third grade of switch room, a switch is set, which is also third level switch protection.
The present embodiment is to first order switch protection fixed value adjusting:
First order switch setting three-stage overcurrent protection, overcurrent I sections of investment, II sections of overcurrent and III sections of overcurrent.Three times
Definite value is respectively set to 0s, 0.4s, 0.6s.
I sections of current ration I of overcurrentczIBy escape the first order switch to the second level switch setting at failure maximum current it is whole
It is fixed, it may be assumed that
IczI≥Kk*Icf.max(3)
Wherein: IczIFor I sections of current rations of outlet switch overcurrent；KkFor safety factor, 1.3 are taken；Icf.max(3)For maximum fortune
The three phase short circuit fault electric current of first order switch setting, I under line modecf.max(3)As following formula calculates:
Wherein: ZxtminFor equivalent impedance (the minimum system resistance that higher level's power supply system is switched to the first order under maximum mode
It is anti-)；ZcfFor first and second grade of switch room line impedance minimum value.
Failure minimum current check at outlet switch under minimum mode is pressed in I sections of sensitivity of overcurrent, it may be assumed that
Wherein: Ic.min(2)For two-phase short-circuit fault electric current at outlet switch under minimum operational mode；
KlmFor sensitivity coefficient, 1.0 are taken.When sensitivity is less than 1.0, it can adjust block switch and position be set, to ensure
Sensitivity is not less than 1.0, Ic.min(2)It calculates according to the following formula:
ZxtmaxThe equivalent impedance (maximum system impedance) switched for higher level's power supply system under minimum mode to the first order
II sections of current ration I of overcurrentczIIIt switchs by the first order is escaped to the maximum fault current adjusting at third level switch,
That is:
IczII≥Kk*Icff.max(3)
Wherein: IczIIFor II sections of current rations of first order switch over-current；KkFor safety factor, 1.3 are taken；Icff.max(3)For most
Three-phase shortcircuit under the big method of operation at the setting of third level switch (if thering are multiple third level to switch, with equivalent impedance maximum)
Fault current, Icff.max(3)Calculate such as following formula:
Wherein: ZxtminFor equivalent impedance (the minimum system resistance that higher level's power supply system is switched to the first order under maximum mode
It is anti-)；ZcffFor first and third grade of switch room line impedance minimum value.
III sections of definite value I of overcurrentczIIIAccording to route maximum load current adjusting of hiding, it may be assumed that
IczIII≥Kk*Iav.max
Wherein: KkFor safety factor, 1.3 are taken；
Iav.maxFor the route maximum load current in annual running mode, can be inquired according to route history log
It arrives.
The present embodiment is to second level switch protection fixed value adjusting:
The protection setting two-part protection of second level switch, I sections and overcurrent II sections of overcurrent, time definite value is respectively 0.2s,
0.4s。
II sections of switch over-current I sections of the second level, overcurrent current rations are respectively according to no more than II sections of first order switch over-current, mistake
Flow 0.9 times of adjusting of III sections of current rations；That is:
IfzI≤Kp*IczII
IfzII≤Kp*IczIII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzI、IfzIII sections, II sections electric currents of overcurrent of respectively second level switch are fixed
Value；IczII、IczIIIFor II sections, III sections current rations of overcurrent of first order switch.
The present embodiment is to third level switch protection fixed value adjusting:
Third level switch protection is arranged two-part and protects, and I sections and overcurrent II sections of overcurrent, time definite value is respectively 0s, 0.2s.
Overcurrent I sections of current ration adjusting, II sections of overcurrent are respectively according to no more than I sections of second level switch over-current, II sections of overcurrent
0.9 times of adjusting of current ration；That is:
IfzzI≤Kp*IfzI
IfzzII≤Kp*IfzII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzzI、IfzzIII sections, II sections electric currents of overcurrent of respectively third level switch are fixed
Value；IfzI、IfzIIRespectively I sections, II sections current rations of overcurrent of second level switch.
Reclosing is arranged in the present embodiment:
To the route of three-level protective configuration, there is the switch of reclosing function, reclosing should be put into, reclosing should match step by step
Set, when failure leads to first order switch trip, below two class protection also tripping, reclosing successively weighs sequentially in time
It closes, the first order protects reclosure time that 2.6s is arranged, and the second level protects reclosing that 4s, third level protection setting 6s is arranged.
Protection of the present embodiment to keypoint part:
For on backbone and branch line, there are potential faults points phenomena such as more, big motor load, history Frequent trip
According to the actual situation the regular tap of no-delay definite value is arranged in its front end, route where current ration is set as it is most in position
0.9 times of latter end protective current definite value；Fastp-acting fuse can also be installed, blowout current is set as the fuse rear end institute on-load
1.3 times of corresponding electric currents of total capacity.
Claims (2)
1. a kind of 10 KV line of single supply protection three-level configuration and fixed value adjusting method, which is characterized in that the method exists
2 block switches are set on 10kV route backbone, 6 kilometers of route is greater than to wherein length, using three-level protective configuration pair
Route is protected；The route distance of three step switch is no less than 2km；The setting of the second level, third level switch on backbone
Position selects near three branch position of backbone；First order switch, second level switch and third level switch are carried out respectively again
Fixed value adjusting is protected, and reclosing is configured；
It is characterized in that, the first order switch protection fixed value adjusting is as follows:
First order switch setting three-stage overcurrent protection, overcurrent I sections of investment, II sections of overcurrent and III sections of overcurrent；Three sections of time definite values
It is respectively set to 0s, 0.4s, 0.6s；
I sections of current ration I of overcurrentczIIt switchs by the first order is escaped to the failure maximum current adjusting at the switch setting of the second level,
That is:
IczI≥Kk*Icf.max(3)
Wherein: IczIFor I sections of current rations of outlet switch overcurrent；KkFor safety factor, 1.3 are taken；Icf.max(3)For maximum operation side
The three phase short circuit fault electric current of first order switch setting, I under formulacf.max(3)As following formula calculates:
Wherein: ZxtminFor the equivalent impedance that higher level's power supply system is switched to the first order under maximum mode；ZcfIt is switched for first and second grade
Between line impedance minimum value；
Failure minimum current check at outlet switch under minimum mode is pressed in I sections of sensitivity of overcurrent, it may be assumed that
Wherein: Ic.min(2)For two-phase short-circuit fault electric current at outlet switch under minimum operational mode；
KlmFor sensitivity coefficient, 1.0 are taken；When sensitivity is less than 1.0, it can adjust block switch and position be set, it is sensitive to ensure
Degree is not less than 1.0；Ic.min(2)It calculates according to the following formula:
ZxtmaxThe equivalent impedance switched for higher level's power supply system under minimum mode to the first order；
II sections of current ration I of overcurrentczIIIt switchs by the first order is escaped to the maximum fault current adjusting at third level switch, it may be assumed that
IczII≥Kk*Icff.max(3)
Wherein: IczIIFor II sections of current rations of first order switch over-current；KkFor safety factor, 1.3 are taken；Icff.max(3)For maximum fortune
Three phase short circuit fault electric current under line mode at the setting of third level switch, Icff.max(3)Calculate such as following formula:
Wherein: ZxtminFor the equivalent impedance that higher level's power supply system is switched to the first order under maximum mode；ZcffIt is opened for first and third grade
Line impedance minimum value between pass；
III sections of definite value I of overcurrentczIIIAccording to route maximum load current adjusting of hiding, it may be assumed that
IczIII≥Kk*Iav.max
Wherein: KkFor safety factor, 1.3 are taken；
Iav.maxFor the route maximum load current in annual running mode；
The second level switch protection fixed value adjusting is as follows:
The protection setting two-part protection of second level switch, I sections and overcurrent II sections of overcurrent, time definite value is respectively 0.2s, 0.4s；
II sections of switch over-current I sections of the second level, overcurrent current rations are respectively according to no more than II sections of first order switch over-current, overcurrent
0.9 times of adjusting of III sections of current rations；That is:
IfzI≤Kp*IczII
IfzII≤Kp*IczIII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzI、IfzIIRespectively I sections, II sections current rations of overcurrent of second level switch；
IczII、IczIIIFor II sections, III sections current rations of overcurrent of first order switch；
The third level switch protection fixed value adjusting is as follows:
Third level switch protection is arranged two-part and protects, and I sections and overcurrent II sections of overcurrent, time definite value is respectively 0s, 0.2s；
Overcurrent I sections of current ration adjusting, II sections of overcurrent are respectively according to no more than II sections of I sections of second level switch over-current, overcurrent electric currents
0.9 times of adjusting of definite value；That is:
IfzzI≤Kp*IfzI
IfzzII≤Kp*IfzII
Wherein: KpFor cooperation coefficient, 0.9 is taken；IfzzI、IfzzIIRespectively I sections, II sections current rations of overcurrent of third level switch；
IfzI、IfzIIRespectively I sections, II sections current rations of overcurrent of second level switch.
2. 10 KV line of a kind of single supply protection three-level configuration according to claim 1 and fixed value adjusting method, special
Sign is that the reclosing is configured as follows:
To the route of three-level protective configuration, there is the switch of reclosing function, reclosing should be put into, reclosing should configure step by step,
When failure leads to first order switch trip, below two class protection also tripping, reclosing is successively overlapped sequentially in time,
The first order protects reclosure time that 2.6s is arranged, and the second level protects reclosing that 4s, third level protection setting 6s is arranged.
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| CN108448547A (en) * | 2018-04-17 | 2018-08-24 | 南京信息工程大学 | A distribution network line protection configuration and setting calculation method |
| CN109670654B (en) * | 2019-01-09 | 2022-08-16 | 国网江西省电力有限公司电力科学研究院 | Method for automatically identifying rationality of protection setting value of distribution network line |
| CN110247371A (en) * | 2019-04-30 | 2019-09-17 | 上海宏力达信息技术股份有限公司 | The configuration method of multi-stage vacuum breaker on a kind of power distribution network |
| CN111049113B (en) * | 2020-01-03 | 2022-03-22 | 国网上海市电力公司 | Adaptive setting method of 35KV distribution network setting based on centralized master station architecture |
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