CN104917161B - Adaptive distance protection method - Google Patents
Adaptive distance protection method Download PDFInfo
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- CN104917161B CN104917161B CN201510342896.6A CN201510342896A CN104917161B CN 104917161 B CN104917161 B CN 104917161B CN 201510342896 A CN201510342896 A CN 201510342896A CN 104917161 B CN104917161 B CN 104917161B
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- range distance
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Abstract
The invention discloses adaptive distance protection method, following steps：After system jam, fault current voltage, fault transient component, system line impedance ratio SIR are calculated in real time；According to step 1 result of calculation, calculate and owe range distance element measurement error；According to step 2 result of calculation, dynamic, which adjusts, owes range distance element movement scope；According to step 1 result of calculation, calculate and owe range distance element movement confusion region；According to step 4 result of calculation, dynamic, which adjusts, owes the range distance element movement stabilization time；According to step 3 and step 5 result of calculation, whether judging distance logic meets, if meeting operation condition, owes the outlet of range distance protection act.The present invention solves the problems, such as that perplex power system industry owes range distance protection on how short could put into of circuit; it can ensure that when the protection of deficient range distance is applied to any circuit all without surmounting; fixed value adjusting person works burden is greatly alleviated, improves system operation reliability.
Description
Technical field
The present invention relates to a kind of deficient range distance protection act scope and the technology of action stabilization time adjustment, more particularly to
A kind of adaptive distance protection technology.
Background technology
Distance protection is the feature using short-circuit moment voltage, electric current while change, is pacified by calculating trouble point to protection
Fill the distance in place and act.Owe range distance protection and be generally no-delay action element, it is therefore an objective to this line failure
When quick acting, and offside bus-bar fault or subordinate's line fault akinesia, due to measurement error, in order to prevent owing scope
Distance protection surmount malfunction, owe that range distance protection is general to adjust for the 80%~90% of total track length, but for being
Unite circuit bigger impedance ratio SIR, especially while the circuit that fault current is especially small, during troubles inside the sample space false voltage and
Fault current very little, distance protection relative error is larger, and external area error may cause to owe surmounting for range distance protection, therefore
In practical application, when circuit very in short-term, owe range distance protection typically to exit.
But how long circuit could put into deficient range distance protection actuallyHome and abroad leads to without explicitly stated at present
Way is simply to determine whether that putting into deficient range distance protects according to line length, and line length is usually rule of thumb
It is determined that.In fact, owing the problem of range distance protection is applied to more long transmission lines on earth, system fixed value adjusting people not only annoying
Member, or even connect protection producer and also be difficult to demonstrate, when causing to break down in real system running, separate line is owed
The situation of range distance malfunction.
It is well known that the measurement error of protection device distancing element is relevant with input current, voltage swing, different SIR
It is related to the fault measuring voltage of fault moment protection device, different system impedance sizes determines the fault measuring of protection device
Electric current, therefore examine and owe range distance protection error, the length of circuit should be considered, consider system impedance and circuit again
Impedanoe ratio, for big system, even if very short circuit, distance protection can be also applicable, and for mini system, though circuit compared with
It is long, also not necessarily it is applicable.
The starting stage that failure occurs, due to high fdrequency component, the influence of attenuating dc component, low frequency component, after failure
Short time internal fault measurement impedance possibility is less than normal, causes to owe that action may be surmounted during distance protection possibility external area error, but with
The passage of time, fault transient component content can be less and less, also less and less so as to be influenceed caused by the measurement adjusted the distance.
For distance protection equipment, if can be according to the steady-state error characteristic and transient error characteristic of itself, dynamic adjusts
Owe range distance protection act scope and action stabilization time, it is ensured that owe range distance and protect under short-term road applicable cases not
It can surmount, will greatly mitigate fixed value adjusting person works' burden, improve system operation reliability.
Based on this problem, patent of the present invention is improved existing deficient range distance protection technique, and this programme is thus
Produce.
The content of the invention
The purpose of the present invention is：When being applied to short-term road for existing deficient range distance protection, only rely on artificial judgment its
Input condition, cause to owe range distance protection miscarrying it is fashionable may bring surmount malfunction problem, there is provided adaptive distance is protected
Maintaining method.This method in real time dynamically adjust owe range distance protection act scope and action the stabilization time, it is ensured that owe scope away from
It is used for any circuit all without surmounting from protection, alleviates fixed value adjusting person works burden, improving system operation can
By property.
In order to reach above-mentioned purpose, the technical scheme is that：Adaptive distance protection method, it is characterised in that including
Following steps：
(1) after system jam, fault current voltage, fault transient component, system line impedance ratio are calculated in real time
SIR；
(2) according to step 1 result of calculation, calculate and owe range distance element measurement error；
(3) according to step 2 result of calculation, dynamic, which adjusts, owes range distance element movement scope；
(4) according to step 1 result of calculation, calculate and owe range distance element movement confusion region；
(5) according to step 4 result of calculation, dynamic, which adjusts, owes the range distance element movement stabilization time；
(6) according to step 3 and step 5 result of calculation, whether judging distance logic meets, if meeting operation condition, owes
Range distance protection act exports.
Further, the fault transient component in the step (1) includes failure high fdrequency component, failure attenuating dc component
And content of the fault transient component in fault current voltage.
Further, the system line impedance ratio SIR in the step (1) is that this ground voltage that protector measuring arrives becomes
Change amount and the ratio of line drop variable quantity.
Further, in the step (3), by calculating the ratio of fault current and system line impedance ratio SIR, multiplied by
The definite value protected with the deficient range distance before adjustment, the definite value of the deficient range distance element after being adjusted；The deficient scope away from
Definite value from element is to owe range distance element movement scope.
Further, in the step (4), the content of nonstoichiometric oxide and attenuating dc component is first calculated, multiplied by be
The result of multiplication, is then multiplied by number with the definite value that deficient range distance is protected, and acquired results are to owe range distance element movement
Confusion region.
Further, in the step (5), if fault measuring impedance falls in deficient range distance element movement confusion region,
Range distance protection is then owed through deferred action, dynamically to adjust the deficient range distance element movement stabilization time.
The present invention is after system jam, computing system impedance ratio SIR, fault current voltage, the failure of fault moment
The content of high fdrequency component, failure attenuating dc component and fault transient component in fault current voltage.According to being calculated
Fault current voltage, calculate line impedance than SIR, SIR is the local voltage variety and circuit pressure that protector measuring arrives
The ratio of variable quantity drops.Fault current and SIR ratio are calculated, deficient range distance protection definite value is multiplied by, realizes and owe range distance
The dynamic adjustment of protection act scope.The content of nonstoichiometric oxide and attenuating dc component is calculated, is multiplied by certain coefficient, it is tied
The definite value that fruit is protected with deficient range distance is multiplied, and its result is confusion region.If fault measuring impedance falls in action fuzzy region,
Range distance protection act is then owed through acting the stabilization time, if fault measuring impedance is in the range of acting characteristic but is not acting
In confusion region, then range distance protection act is owed without the additional act stabilization time.Adjust and be delayed stabilization by limits
If the deficient range distance protection of time adjustment meets distance protection action logic, distance protection action outlet is owed.
The invention has the advantages that range distance protection act scope and action stabilization time are owed by adjust automatically,
Solving the problems, such as to perplex power system industry could put into deficient range distance and protect on how short circuit is, can ensure that deficient scope away from
All without surmounting when being applied to any circuit from protection, greatly alleviate fixed value adjusting person works and bear, improve system
Operational reliability.
Brief description of the drawings
Fig. 1 is to owe range distance protection act delay confusion region schematic diagram.
Fig. 2 is adaptive distance protection logic.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is to the present invention below according to accompanying drawing
It is further elaborated.It should be appreciated that specific implementation described herein does not limit this only to explain the present invention
Invention.
Embodiment 1
Referring to Fig. 1 and Fig. 2, this adaptive distance protection method, comprise the following steps：
(1) after system jam, fault current voltage, fault transient component, system line impedance ratio are calculated in real time
SIR；
(2) according to step 1 result of calculation, calculate and owe range distance element measurement error；
(3) according to step 2 result of calculation, dynamic, which adjusts, owes range distance element movement scope；
(4) according to step 1 result of calculation, calculate and owe range distance element movement confusion region；
(5) according to step 4 result of calculation, dynamic, which adjusts, owes the range distance element movement stabilization time；
(6) according to step 3 and step 5 result of calculation, whether judging distance logic meets, if meeting operation condition, owes
Range distance protection act exports.
Preferably, the fault transient component in the step (1) includes failure high fdrequency component, failure decaying dc
The content of component and fault transient component in fault current voltage.System line impedance ratio SIR in the step (1) is
The ratio of the local voltage variety that protector measuring arrives and line drop variable quantity.In the step (3), by calculating event
Hinder electric current and system line impedance ratio SIR ratio, multiplied by the definite value protected with the deficient range distance before adjustment, after being adjusted
Deficient range distance element definite value；The definite value of the deficient range distance element is to owe range distance element movement scope.Institute
State in step (4), first calculate the content of nonstoichiometric oxide and attenuating dc component, multiplied by with coefficient, then by the result of multiplication
It is multiplied with the definite value of deficient range distance protection, acquired results are to owe range distance element movement confusion region.The step (5)
In, if fault measuring impedance falls in deficient range distance element movement confusion region, owe range distance and protect through deferred action, with
Dynamic, which adjusts, owes the range distance element movement stabilization time.
Fig. 1 is to owe range distance protection act delay confusion region schematic diagram.If transient state component is obvious, confusion region scope compared with
Greatly, otherwise smaller, merely exemplary herein, other distance protection acting characteristics implement.Z in figureZDTo owe range distance
Protect definite value, ZadjFor the deficient range distance protection act scope after adjustment.Fig. 2 is the signal of adaptive distance protection logic step
Figure, detailed adaptive range distance protection realize that step is as follows：
1. after system jam, computing system impedance ratio SIR, fault current voltage, the high fdrequency component of fault moment
And the transient state component such as attenuating dc component value；The calculating of system impedance ratio be based on failure before and after voltage variety, electric current
Variable quantity and deficient range distance protection fixed value calculation obtain；The fault transient component of fault moment, which calculates, includes the high frequency division of failure
The calculating of amount and failure attenuating dc component, while also include fault transient component the cubage in fault component.
2. according to the fault current voltage, fault transient component value, the SIR that are calculated, calculate and owe the survey of range distance element
Measure error amount, on the basis of original protection definite value, dynamic, which adjusts, in real time owes range distance protection act scope, SIR it is bigger therefore
Barrier electric current is smaller, and protection act scope is smaller.
3. according to distancing element measurement error size, range distance element movement scope is owed in adjustment in real time, avoids event outside area
Barrier owes range distance element and surmounts malfunction.Z in Fig. 1adjDeficient range distance protection act scope after as adjusting.
4. the fault transient component after occurring according to failure, the content of nonstoichiometric oxide and attenuating dc component is calculated, from
And distancing element action fuzzy region is calculated, over time, nonstoichiometric oxide and attenuating dc component content slowly reduce,
Confusion region slowly reduces.Shaded area is to owe range distance protection act delay confusion region in Fig. 1.
5. if fault measuring impedance falls in action fuzzy region, protection act continues on through stabilization delay, if fault measuring
Impedance is not in the range of acting characteristic but in action fuzzy region, then when owing range distance protection act without additional act stabilization
Between.
6. if the deficient range distance protection for the stabilization time adjustment that adjusts and be delayed by limits meets that distance protection is moved
Make logic, then distance protection action outlet.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (3)
1. adaptive distance protection method, it is characterised in that comprise the following steps：
(1) after system jam, fault current, false voltage, fault transient component, system line impedance ratio are calculated in real time
SIR；
(2) calculate and owe range distance element measurement error：Fault current is calculated with system line impedance ratio SIR ratio as deficient
Range distance element measurement error；
(3) dynamic, which adjusts, owes range distance element movement scope：Deficient range distance element measurement error is multiplied by deficient before adjustment
The definite value of range distance protection, the definite value of the deficient range distance element after being adjusted；The definite value of the deficient range distance element
As owe range distance element movement scope；
(4) calculate and owe range distance element movement confusion region：Nonstoichiometric oxide and decaying dc are calculated according to fault transient component
The content of component, multiplied by with coefficient, then the result of multiplication is multiplied with the definite value that the deficient range distance before adjustment is protected, gained
As a result it is to owe range distance element movement confusion region；
(5) dynamic, which adjusts, owes the range distance element movement stabilization time：If fault measuring impedance falls in deficient range distance element
Action fuzzy region, then range distance protection is owed through deferred action, if fault measuring impedance is in the range of acting characteristic but does not exist
In action fuzzy region, then range distance protection act is owed without the additional act stabilization time, dynamically to adjust deficient range distance member
Part acts the stabilization time；
(6) when according to the deficient range distance element movement scope after adjustment and the deficient range distance element movement stabilization after adjustment
Between, whether judging distance logic meets, if meeting operation condition, owes the outlet of range distance protection act.
2. adaptive distance protection method as claimed in claim 1, it is characterised in that：Fault transient in the step (1)
Component includes failure high fdrequency component, failure attenuating dc component and fault transient component in fault current, false voltage
Content.
3. adaptive distance protection method as claimed in claim 1, it is characterised in that：System line in the step (1)
Impedance ratio SIR is the ratio of local voltage variety and line drop variable quantity that protector measuring arrives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342896.6A CN104917161B (en) | 2015-06-18 | 2015-06-18 | Adaptive distance protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342896.6A CN104917161B (en) | 2015-06-18 | 2015-06-18 | Adaptive distance protection method |
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| CN104917161A CN104917161A (en) | 2015-09-16 |
| CN104917161B true CN104917161B (en) | 2018-01-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018227466A1 (en) * | 2017-06-15 | 2018-12-20 | Abb Schweiz Ag | Method for detecting fault in power transmission line and protection system using the same |
| CN107732879B (en) * | 2017-10-13 | 2019-02-22 | 南京南瑞继保电气有限公司 | A kind of deficient range rapid protection system and method for half wavelength line |
| CN109617027B (en) * | 2018-12-11 | 2020-07-31 | 华北电力大学 | High-frequency sudden-change distance protection method for flexible direct-current power distribution system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064538A (en) * | 2010-12-15 | 2011-05-18 | 国网电力科学研究院 | Realization method of variable distance relay automatically adapting to system line impedance ratio |
| CN103296651A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Interphase fault distance protecting method for overload maloperation-preventive and anti-high-resistance lines |
| CN104716636A (en) * | 2015-03-11 | 2015-06-17 | 国电南瑞科技股份有限公司 | Method for protecting distance protection III section against malfunction caused by overload |
-
2015
- 2015-06-18 CN CN201510342896.6A patent/CN104917161B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064538A (en) * | 2010-12-15 | 2011-05-18 | 国网电力科学研究院 | Realization method of variable distance relay automatically adapting to system line impedance ratio |
| CN103296651A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Interphase fault distance protecting method for overload maloperation-preventive and anti-high-resistance lines |
| CN104716636A (en) * | 2015-03-11 | 2015-06-17 | 国电南瑞科技股份有限公司 | Method for protecting distance protection III section against malfunction caused by overload |
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