CN104332965B - A kind of method for determining the high limit coefficient of singlephase earth fault identification - Google Patents
A kind of method for determining the high limit coefficient of singlephase earth fault identification Download PDFInfo
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- CN104332965B CN104332965B CN201410545479.7A CN201410545479A CN104332965B CN 104332965 B CN104332965 B CN 104332965B CN 201410545479 A CN201410545479 A CN 201410545479A CN 104332965 B CN104332965 B CN 104332965B
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Abstract
The present invention relates to a kind of method for determining the high limit coefficient of singlephase earth fault identification, methods described the described method comprises the following steps suitable for transmission line of electricity of the overload with the singlephase earth fault identification through small transition resistance：Transmission line of electricity normal operation and its phase voltage cosine component through the protection installation place under small transition resistance singlephase earth fault are determined respectively；It is determined that high limit coefficient D selection principle；It is determined that high limit coefficient D selection range；The high limit coefficient D of verification reliability and sensitivity.Methods described can ensure through reliability during sensitivity and overload during small transition resistance singlephase earth fault.The selection and verification of high limit coefficient are realized inside line protection, are adjusted without outside.
Description
Technical field：
The present invention relates to a kind of method for determining the high limit coefficient of singlephase earth fault identification, a kind of overload is more particularly to
With determining method through the high limit coefficient of small transition resistance singlephase earth fault identification.
Background technology：
In power system transmission line, when transmission line of electricity is in overload state, the measurement impedance of protection installation place can
III sections of active regions of distance protection can be entered, protection misoperation is caused, large area can be caused under accident scope, serious conditions by expanding
Power outage.At present, distance protection should be all based on what impedance plane was analyzed to the measure of overload, by being manually set
Load restraining line can not solve distance protection misoperation under serious Overload, while the influence distance protection of load restraining line
Resistance to transition resistance ability.Compared with impedance plane, overload reaction is generator rotor angle on voltage plane, by protecting more than the voltage of installation place
String component can represent in the case of the size of generator rotor angle, failure that protection installation place voltage cosine component reacts the size of transition resistance,
Circuit overload and failure can be recognized using voltage cosine component.
The criterion for recognizing overload and phase-to phase fault using phase voltage cosine component is Wherein definite value
How D chooses D, the performance for criterion is significant as the important parameter for distinguishing overload and singlephase earth fault,
Patent No. ZL200910273065.2 patent of invention discloses what is adjusted according to peak load when escaping normal operation
Technical scheme, wherein span 0.6~0.8, but when through small transition resistance singlephase earth faultIt is smaller, D's
Value is also smaller.Therefore need to provide a kind of overload with limiting coefficient determination side through the identification of small transition resistance singlephase earth fault is high
Method, to solve the above mentioned problem of prior art presence.
The content of the invention：
It is an object of the invention to provide a kind of method for determining the high limit coefficient of singlephase earth fault identification, this method can be protected
Demonstrate,prove through reliability during sensitivity and overload during small transition resistance singlephase earth fault.
To achieve the above object, the present invention uses following technical scheme：One kind determines the high limit system of singlephase earth fault identification
Several methods, methods described is suitable for transmission line of electricity of the overload with the singlephase earth fault identification through small transition resistance, institute
The method of stating comprises the following steps：
(1) determine that transmission line of electricity normal operation is pacified with it through the protection under small transition resistance singlephase earth fault respectively
Phase voltage cosine component at dress；
(2) high limit coefficient D selection principle is determined；
(3) high limit coefficient D selection range is determined；
(4) high limit coefficient D reliability and sensitivity is verified.
The method for the high limit coefficient of a kind of determination singlephase earth fault identification that the present invention is provided, described in the step (1)
Normal operation includes Overload；When under the normal operation, the phase voltage cosine of the protection installation place
Component is more than 0.707 times this side power supply phase potential.
The method for the high limit coefficient of a kind of determination singlephase earth fault identification that the present invention is provided, when defeated in the step (1)
When electric line is through small transition resistance singlephase earth fault, the phase voltage cosine component of the protection installation place is less than 0.707 times
This side power supply phase potential.
A kind of method for another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, it is described through small
Transition resistance singlephase earth fault is with load identical criterion：
Wherein, C is the lower bound coefficient of criterion, and U is the phase voltage of protection installation place,For protection installation place phase voltage and phase
The angle of electric current, D limits coefficient for the high of criterion.
A kind of method for another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, the step
(2) selection principle in is：When ensureing Overload, the criterion safety factor is more than on the premise of 1, improves as far as possible
Sensitivity coefficient through criterion during small transition resistance singlephase earth fault.
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided,
Phase voltage cosine component/D of the safety factor=overload；
Phase voltage cosine components of the sensitivity coefficient=D/ through small transition resistance singlephase earth fault.
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, minimum institute
State safety factor=0.707/D.
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, its feature exists
In：Range of choice in the step (3) is：Phase voltage cosine component/D of the overload>1；
The minimum high limit coefficient D of safety factor correspondence<0.707.
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, is normally being transported
During market condition, the reliability in the step (4) is according to the high limit of phase voltage cosine component D ' verifications of actual measurement protection installation place
Number D reliabilities；The safety factor calculation formula is=D '/D, and the safety factor should be greater than 1；
When the safety factor is less than 1, reducing high limit coefficient D makes the safety factor be more than 1.
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, works as power transmission line
When road is occurred through small transition resistance single-phase earthing, the sensitivity in the step (4) protects the phase voltage of installation place according to actual measurement
Cosine component D " is verified；The sensitivity coefficient calculation formula is=D/D ".
A kind of method for the another preferred high limit coefficient of determination singlephase earth fault identification that the present invention is provided, the high limit
The selection and verification of coefficient are realized by the inside of line protection, are adjusted without outside.
With immediate prior art ratio, the present invention, which provides technical scheme, has following excellent effect
1st, the invention provides high through small transition resistance singlephase earth fault and overload identical criterion based on voltage plane
Limit coefficient Tuning；
2nd, the invention provides high through small transition resistance singlephase earth fault and overload identical criterion based on voltage plane
Limit coefficient reliability check addition；
3rd, the invention provides high through small transition resistance singlephase earth fault and overload identical criterion based on voltage plane
Limit Coefficient Sensitivity check addition；
4th, present invention can ensure that through reliability during sensitivity and overload during small transition resistance singlephase earth fault；
5th, the selection and verification of high limit coefficient of the invention are realized inside device, are adjusted without outside；
6th, the sensitivity of the present invention criterion when reliability and failure of criterion when can take into account overload simultaneously.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Embodiment
With reference to embodiment, the invention will be described in further detail.
Embodiment 1：
As shown in figure 1, a kind of method for determining the high limit coefficient of singlephase earth fault identification of the invention of this example, methods described is fitted
For overload with the transmission line of electricity of the singlephase earth fault identification through small transition resistance, the described method comprises the following steps：
(1) determine transmission line of electricity normal operation and transmission line of electricity through under small transition resistance singlephase earth fault respectively
Protect the phase voltage cosine component of installation place；
(2) high limit coefficient D selection principle is determined；
(3) high limit coefficient D selection range is determined；
(4) high limit coefficient D reliability and sensitivity is verified.
Transmission line of electricity normal operation includes Overload in the step (1)；When in the normal operation
Under, the phase voltage cosine component of the protection installation place is more than the power supply phase potential of 0.707 times of this side.
When in the step (1) transmission line of electricity through small transition resistance singlephase earth fault, the phase of the protection installation place
Voltage cosine component is less than the power supply phase potential of 0.707 times of this side.
It is described to be through small transition resistance singlephase earth fault and load identical criterion：
Wherein, C is the lower bound coefficient of criterion, and U is the phase voltage of protection installation place,For protection installation place phase voltage and phase
The angle of electric current, D is high limit coefficient.
Selection principle in the step (2) is：When ensureing Overload, the criterion safety factor is more than 1
Under the premise of, the sensitivity coefficient through criterion during small transition resistance singlephase earth fault is improved as far as possible.
The safety factor is：Phase voltage cosine component/D of safety factor=overload；
The sensitivity coefficient is：Phase voltage cosine components of the sensitivity coefficient=D/ through small transition resistance singlephase earth fault.
Minimum safety factor=the 0.707/D.
Range of choice in the step (3) is：Phase voltage cosine component/D of the overload>1；
The minimum high limit coefficient D of safety factor correspondence<0.707.
In normal operation, the reliability in the step (4) protects the phase voltage cosine of installation place according to actual measurement
The high limit coefficient D reliabilities of component D ' verifications；The safety factor calculation formula is=D '/D, and the safety factor should be greater than 1；
When the safety factor is less than 1, reducing high limit coefficient D makes the safety factor be more than 1.
When transmission line of electricity occurs through small transition resistance single-phase earthing, the sensitivity in the step (4) is protected according to actual measurement
Protect the phase voltage cosine component D " verifications of installation place；The sensitivity coefficient calculation formula is=D/D ".
The selection and verification of the high limit coefficient are realized by the inside of line protection, are adjusted without outside.
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.5；
(2) high limit coefficient D minimum safety factor is 0.707/0.5=1.414, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.5=1.7, meets overload
Voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.5/0.2=
2.5。
Embodiment 2：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.7；
(2) high limit coefficient D minimum safety factor is 0.707/0.7=1.01, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.7=1.21, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.7/0.2=
3.5。
Embodiment 3：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.706；
(2) high limit coefficient D minimum safety factor is 0.707/0.706=1.001, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.706=1.204, is met
Load voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.706/0.2
=3.53.
Embodiment 4：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.6；
(2) high limit coefficient D minimum safety factor is 0.707/0.6=1.18, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.6=1.42, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.6/0.2=
3。
Embodiment 5：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.59；
(2) high limit coefficient D minimum safety factor is 0.707/0.59=1.198, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.59=1.44, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.59/0.2
=2.95.
Embodiment 6：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.45；
(2) high limit coefficient D minimum safety factor is 0.707/0.45=1.57, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.45=1.89, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.2 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.45/0.2
=2.25.
Embodiment 7：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.1；
(2) high limit coefficient D minimum safety factor is 0.707/0.1=7.07, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.1=8.5, meets overload
Voltage between phases cosine component/D>1；
(4) if through D "=0.05 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.1/0.05
=2.
Embodiment 8：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.2；
(2) high limit coefficient D minimum safety factor is 0.707/0.2=3.535, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.2=4.25, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.05 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.2/0.05
=4.
Embodiment 9：
(1) according to the minimum high limit coefficient D of safety factor correspondence of overload<0.707；High limit coefficient should meet 0.707>D, example
Such as select D=0.35；
(2) high limit coefficient D minimum safety factor is 0.707/0.35=2.02, meets high limit coefficient selection principle；
(3) if D '=0.85 during actual motion, high limit coefficient D safety factor is 0.85/0.35=2.43, meets negative
Lotus voltage between phases cosine component/D>1；
(4) if through D "=0.05 during small transition resistance singlephase earth fault, high limit coefficient D sensitivity coefficient is 0.35/
0.05=7.
The present patent application is more than 0.707pu feature according to phase voltage cosine component during overload, from criterion during overload
Reliability and two aspects of sensitivity through criterion during small transition resistance earth fault, it is proposed that based on voltage plane through small mistake
Cross resistance eutral grounding failure and the high limit coefficient D setting methods of overload identical criterion, the reliability of criterion when ensureing overload
On the premise of improve the sensitivity through criterion during small transition resistance earth fault as far as possible, the definite value is by line protection
Inside realize, and when can take into account overload simultaneously the reliability of criterion and through during small transition resistance earth fault criterion it is sensitive
Property.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field with reference to above-described embodiment although should be understood：Still can be to embodiment of the invention
Modify or equivalent substitution, these any modifications or equivalent substitution without departing from spirit and scope of the invention, in Shen
Within claims of the invention that please be pending.
Claims (3)
1. a kind of method of the high limit coefficient of determination singlephase earth fault identification, methods described is applied to overload and through small transition electricity
In the transmission line of electricity of the singlephase earth fault identification of resistance, it is characterised in that：It the described method comprises the following steps：
(1) determine transmission line of electricity normal operation with it through the protection installation place under small transition resistance singlephase earth fault respectively
Phase voltage cosine component；
Normal operation described in the step (1) includes Overload；It is described to protect when under the normal operation
Protect the power supply phase potential of this side of the phase voltage cosine component more than 0.707 times of installation place；
When in the step (1) transmission line of electricity through small transition resistance singlephase earth fault, the phase voltage of the protection installation place
Cosine component is less than 0.707 times of power supply phase potential；
(2) high limit coefficient D selection principle is determined；
It is through small transition resistance singlephase earth fault and load identical criterion：
Wherein, C is the lower bound coefficient of criterion, and U is the phase voltage of protection installation place,For protection installation place phase voltage and phase current
Angle, D for criterion high limit coefficient；
Phase voltage cosine component/D during the criterion safety factor=overload；
Phase voltage cosine components of the sensitivity coefficient=D/ of the criterion through small transition resistance singlephase earth fault；
Selection principle in the step (2) is：When ensureing Overload, the criterion safety factor is more than 1 premise
Under, the sensitivity coefficient through criterion during small transition resistance singlephase earth fault is improved as far as possible；
(3) high limit coefficient D selection range is determined；
Range of choice in the step (3) is：Phase voltage cosine component/D of the overload>1；
The minimum high limit coefficient D of safety factor correspondence<0.707；
(4) high limit coefficient D reliability and sensitivity is verified；
In normal operation, the reliability in the step (4) protects the phase voltage cosine component of installation place according to actual measurement
The high limit coefficient D reliabilities of D ' verifications；The safety factor calculation formula is=D '/D, and the safety factor should be greater than 1；
When the safety factor is less than 1, reducing high limit coefficient D makes the safety factor be more than 1；
When transmission line of electricity occurs through small transition resistance single-phase earthing, the sensitivity in the step (4) is according to actual measurement protection peace
Phase voltage cosine component D " verifications at dress；The sensitivity coefficient calculation formula is=D/D ".
2. a kind of method for determining the high limit coefficient of singlephase earth fault identification as claimed in claim 1, it is characterised in that：It is minimum
The safety factor=0.707/D.
3. a kind of method of the high limit coefficient of determination singlephase earth fault identification as described in claim 1 any one, its feature
It is：The selection and verification of the high limit coefficient are realized by the inside of line protection, are adjusted without outside.
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| US7697252B2 (en) * | 2007-08-15 | 2010-04-13 | Leviton Manufacturing Company, Inc. | Overvoltage device with enhanced surge suppression |
| WO2011113199A1 (en) * | 2010-03-17 | 2011-09-22 | 南京南瑞继保电气有限公司 | Method of phase-to-phase distance protection for preventing mal-operation during overload |
| CN103296657B (en) * | 2013-05-19 | 2016-08-03 | 国家电网公司 | Overload faulty action preventing and the line single-phase earth fault distance protection method of resistance to high resistant |
| CN103698647B (en) * | 2013-12-23 | 2016-06-22 | 广东电网公司茂名供电局 | A kind of automatic testing method of Single-phase Earth Fault of Power System |
| CN103872666B (en) * | 2014-03-26 | 2016-02-24 | 国家电网公司 | A kind of load based on voltage plane and single phase ground fault recognition methods |
| CN104037742A (en) * | 2014-07-09 | 2014-09-10 | 国家电网公司 | Extra-high voltage alternating current transmission line protection method |
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