CN109064060A - A kind of excitation surge current leads to the appraisal procedure of protective relaying maloperation risk - Google Patents
A kind of excitation surge current leads to the appraisal procedure of protective relaying maloperation risk Download PDFInfo
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Abstract
A kind of excitation surge current leads to the appraisal procedure of protective relaying maloperation risk; the following steps are included: to specified operating condition and in the case of each parameter information has completely; the complete protection model of parameter, calculating transformer zero-sequenceprotection malfunction risk probability are established according to topological zero-sequence network combination design parameter；In the case where lacking single parameter information when transformer puts into operation, the protection model of single parameter information missing is established, zero-sequenceprotection malfunction risk probability when single parameter missing is calculated；When transformer puts into operation; when the parameter of missing is double parameters or more; many reference amounts missing protection model is established, i-th section of zero-sequenceprotection malfunction probability under every group of remanent magnetism parameter is calculated, in conjunction with the aggregative weighted probability of lower the acquired zero-sequenceprotection malfunction risk assessment of different groups of remanent magnetism parameters.According to the transformer zero-sequenceprotection malfunction risk probability being calculated, judge whether transformer can put into operation.The present invention, which solves assessment transformer air-drop, leads to malfunction risk problem.
Description
Technical field
The invention belongs to tranformer protection technical field, the malfunction for tranformer protection that is applied particularly in failure information system
Risk assessment scheme.
Background technique
In recent years, constantly putting into operation with intelligent substation, the application practice experience deficiency and support system of new technology are still
It does not improve and brings new challenge to its electrical secondary system.Since high pressure built-in transformer has the characteristics of limiting short-circuit current, no
Break the application that puts it in intelligent substation, however when it puts into operation generates the more slow excitation surge current of amplitude greater attenuation has drawn
The event for sending out zero-sequence current protection malfunction a lot of, threatens the safe and stable operation of power grid.It naturally, if can be from system level pair
Risk that this kind of protective device faces carries out " active " assessment, gives certain risk warning, can for create substation or
The air-drop of substation transformer of having put into operation provides corresponding instruction to evade such malfunction event, and that improves electrical secondary system can
By property.
Existing relay protection methods of risk assessment usually utilizes advanced Real-time Measuring Technique by theory of risk assessment method
It is included in the probability of happening for going risk assessment to pass through forecasting risk event in electric network reliability index, analysis quantifies what it may cause
Loss is influenced, determines the ability for bearing risk.In terms of protective device state reliability assessment, mainly there is Markov Model about Forecasting
Method, Fault Tree Analysis and Monte Carlo Analogue Method etc..These current research methods, are being applied to inrush current of transformer to protection
Influence and countermeasure scene when, belong to mostly monomer-type it is " passive " analysis and reply.Not only need to have certain lists
The factor data of aspect is as precondition, and there is no considerations to influence the multifactor of generation of shoving, and does not account for more when certain
When a little factor non-availability, how " active " to be carried out to the risk that this kind of protective device faces from system level and assessed, and give one
Fixed risk warning, has certain limitation and incompleteness.
Summary of the invention
Lead to malfunction risk problem to solve complete assessment transformer air-drop, the invention discloses a kind of excitation surge currents to cause
The appraisal procedure of protective relaying maloperation risk can be obtained specifically based on the parametric data actually grasped using derivation and simulation calculation
False protection probability devise different false protection probability and solve and according to each parameter completeness of generation of shoving is influenced
Method, while giving corresponding malfunction risk indicator.
The present invention specifically uses following technical scheme.
A kind of excitation surge current leads to the appraisal procedure of protective relaying maloperation risk, which is characterized in that the appraisal procedure packet
Include following steps:
Step 1: acquisition transformer parameter information and the integrality for combining actual operating mode verifying parameter information, if ginseng
Amount information completely then enters step 2, otherwise enters step 3；
Step 2: in system with effectively earthed neutral, under transformer during no-load closing and the complete situation of each parameter information,
The complete tranformer protection model of parameter is established according to topological zero-sequence network, judges transformer zero-sequenceprotection malfunction risk probability；
Step 3: in system with effectively earthed neutral, when transformer during no-load closing, judge whether to lack single parameter information,
If yes then enter step 4,5 are otherwise entered step；
Step 4: in the case where lacking single parameter information, establishing the protection model of transformer list parameter information missing, meter
Calculate zero-sequenceprotection malfunction risk probability；
Step 5: when the parameter of missing is double parameters or more, establishing transformer many reference amounts missing protection model, calculate
Transformer zero-sequenceprotection malfunction risk probability；
Step 6: the transformer zero-sequenceprotection malfunction risk probability being calculated according to step 2,4,5 judges according to following table
Whether transformer can put into operation:
The present invention further comprises following preferred embodiment:
In step 1, the parameter information in practical risk assessment includes system voltage, switching angle, iron core remanent magnetism, transformer
Capacity, transformer connection mode, core material, system impedance, when above-mentioned parameter information is completely complete, it is believed that parameter information is complete
It is whole；When scarce one item missing and the above parameter information, then it is assumed that parameter information is imperfect.
In step 2, the tranformer protection model calculating transformer zero-sequenceprotection malfunction risk probability complete based on parameter
Including the following contents:
2.1 acquire the fundametal compoment I that transformer primary side zero sequence is shoved by Fourier decompositionμ0；
2.2 obtain its peak I in the way of difference or derivation0M；
2.3 i-th sections of zero-sequence current protections meet formulaWhen, then the probability of this section of false protection is set as PWL.i=
1, on the contrary its probability is PWL.i=0；Wherein, I0set.iThe setting current of i-th section of zero-sequence current protection, tiFor the adjusting of this section protection
Time, τ are damping time constant.
In step 4, the protection model based on transformer list parameter information missing calculates zero-sequenceprotection malfunction risk probability
Including the following contents:
4.1, which calculate zero sequence according to Given information, shoves fundamental wave attenuation constantWherein, RsIt is equivalent for system
Resistance, LsFor system equivalent inductance, Rσ、LσRespectively transformer first winding ohmic leakage and leakage inductance, Rm、LmRespectively transformer
Equivalent excitation resistance and equivalent magnetizing inductance；
4.2 utilize the setting current I of each section of zero-sequence current protection0set.iWith adjusting actuation time ti, counter to release each section of protection
The minimum zero sequence fundamental wave peak value of movementWherein, I0set.iFor the adjusting electricity of i-th section of zero-sequence current protection
Stream, tiFor the setting time of this section protection, τ is damping time constant；
4.3 determine the combined floodgate limiting angle α of zero-sequenceprotection malfunctioniL、αiRAnd corresponding combined floodgate siding-to-siding block length | | αi| |, it closes a floodgate
Limiting angle passes throughIt determines, it is contemplated that there may be more in a cycle
A combined floodgate limiting angle, combined floodgate siding-to-siding block length are defined as | | αi| |=αiR-αiL, α in formulaiL、αiRFor adjacent two combined floodgates limiting angle, and
αiL< αiR；Wherein, I0M(αi) it is switching angle αiWhen i-th section of zero-sequence current peak value, I0M(αiL) when being the switching angle of minimum limit value
I-th section of zero-sequence current peak value, I0M(αiR) be threshold limit value switching angle when i-th section of zero-sequence current peak value.；
4.4 determine the minimum combined floodgate period alpha of zero-sequence current fundamental wave peak valueTmin=min { αT1、αT2……}；I0M(α)=I0M
(α+αT)；Wherein, αTminIndicate that the minimum of zero-sequence current fundamental wave peak value closes a floodgate the period, αT1、αT2... respectively indicate zero-sequence current
Each switching angle period of fundamental wave peak value, I0MThe zero-sequence current peak value that (α) is switching angle when being α；αTFor zero-sequence current fundamental wave peak
The switching angle period of value.
4.5 utilize 4.3,4.4 obtained combined floodgate siding-to-siding block lengths | | αi| | and the minimum of zero-sequence current fundamental wave peak value closes
Lock period alphaTmin, calculate zero-sequenceprotection malfunction risk probability:
In steps of 5, protection model calculating transformer zero-sequenceprotection malfunction risk probability is lacked according to transformer many reference amounts
Including the following contents:
Difference group iron core remanent magnetism parameter when n group transformer drops is chosen, using every group of iron core remanent magnetism as known parameter, according to
Only the risk assessment probability under the unknown single parameter information missing scene of switching angle solves, and is calculated under every group of remanent magnetism parameter the
I sections of zero-sequenceprotection malfunction probability are PWL(X).i, in conjunction with lower the acquired zero-sequenceprotection malfunction risk assessment of different groups of remanent magnetism parameters
Aggregative weighted probability are as follows:
In formula, JXWeight by acquiring zero-sequenceprotection malfunction risk under same group of remanent magnetism parameter, difference group zero-sequenceprotection
The weight of malfunction probability is identical, andPWL(X).iIndicate the lower i-th section of zero-sequenceprotection malfunction probability of Group X remanent magnetism parameter.
In steps of 5, transformer drop when difference iron core remanent magnetism parameter be this transformer history drop data or other
Transformer drops data.
The invention has the following advantages:
The present invention is aiming at the problem that air-drop of high pressure built-in transformer leads to zero-sequence current protection malfunction, from system level research
It counts and shoves the zero-sequence current protection risk assessment of influence, be not directed to improve availability risk assessment models under scene of shoving blind
The deficiency in area.Consider to influence to shove the multifactor of generation and can non-fully obtain, this patent proposes a kind of meter and parameter completeness
Malfunction probability calculation model.When parameter information lacks non-availability, the data in grid equipment Condition Monitoring Data library are utilized
Supplement calculation, and distribute corresponding weight and obtain aggregative weighted malfunction probability, and give a specific point risk on this basis and refer to
Mark and suggestion for operation.
Detailed description of the invention
Fig. 1 is the flow diagram for the appraisal procedure that excitation surge current of the present invention leads to protective relaying maloperation risk.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawings of the specification.
As shown in Fig. 1, the invention discloses the appraisal procedure that a kind of excitation surge current leads to protective relaying maloperation risk, institutes
State appraisal procedure specifically includes the following steps:
Step 1: verification information integrality.
Practical risk assessment in each parameter information (system parameters such as switching angle, remanent magnetism, method of operation) integrality not
It can guarantee, this step verifies the integrity degree of information, to enter subsequent different malfunction risk probability computing module.?
When transformer puts into operation, it is related to system voltage, switching angle, iron core remanent magnetism, transformer capacity, transformer connection mode, iron core material
Information integrated degree is divided into that parameter is complete, single parameter according to the deletion condition of parameter by the parameter informations such as material, system impedance
Missing, many reference amounts lack three kinds of situations, and respectively enter step 2,3,4 carry out protection model calculate.Wherein system voltage, transformation
Device capacity, transformer connection mode, core material and system impedance parameter information be easy to get, switching angle and iron core remanent magnetism are
Common is not easy determining parameter information.
Step 2: in system with effectively earthed neutral, under transformer during no-load closing and the complete situation of each parameter information,
The complete tranformer protection model of parameter is established according to topological zero-sequence network, judges transformer zero-sequenceprotection malfunction risk probability；
2.1 acquire the fundametal compoment I that zero sequence is shoved by Fourier decompositionμ0Original signal
For respective harmonic superposition, in formulaFor base after function decomposition
This angular frequency；N is the number of Fourier space, a when n is 1n cos(nΩt)+bnSin (n Ω t), using fft algorithm to original
Fundametal compoment I can be obtained in the decomposition of beginning current signal Iμ0。
2.2 obtain its peak I in the way of difference or derivation0M。
2.3 i-th sections of zero-sequence current protections meet formulaWhen, then the probability of this section of false protection is set as PWL.i=
1, on the contrary its probability is PWL.i=0；Wherein, I0set.iThe setting current of i-th section of zero-sequence current protection, tiFor the adjusting of this section protection
Time, τ are damping time constant.
Step 3: in system with effectively earthed neutral, when transformer during no-load closing, judge whether to lack single parameter information,
If yes then enter step 4,5 are otherwise entered step；
Step 4: in the case where lacking single parameter information, establishing the protection model of single parameter information missing, calculate zero sequence and protect
Protect malfunction risk probability.4.1, which calculate zero sequence according to Given information, shoves fundamental wave attenuation constantRsFor system etc.
Imitate resistance, LsFor system equivalent inductance, Rσ、LσRespectively transformer first winding ohmic leakage and leakage inductance, Rm、LmRespectively transformation
The equivalent excitation resistance of device and equivalent magnetizing inductance.
4.2 utilize the setting current I of each section of zero-sequence current protection0set.iWith adjusting actuation time ti, counter to release each section of protection
The minimum zero sequence fundamental wave peak value of movementWherein, I0set.iFor the adjusting electricity of i-th section of zero-sequence current protection
Stream, tiFor the setting time of this section protection, τ is damping time constant.
4.3 determine the combined floodgate limiting angle α of zero-sequenceprotection malfunctioniL、αiRAnd corresponding combined floodgate siding-to-siding block length | | αi||.It closes a floodgate
Limiting angle can pass throughIt determines.In view of there may be multiple in a cycle
Combined floodgate limiting angle, combined floodgate siding-to-siding block length are defined as | | αi| |=αiR-αiL, α in formulaiL、αiRFor adjacent two combined floodgates limiting angle, and αiL
< αiR；Wherein, I0M (αi) it is switching angle αiWhen i-th section of zero-sequence current peak value, I0M(αiL) when being the switching angle of minimum limit value
I-th section of zero-sequence current peak value, I0M(αiR) be threshold limit value switching angle when i-th section of zero-sequence current peak value.
4.4 determine the minimum combined floodgate period alpha of zero-sequence current fundamental wave peak valueTmin=min { αT1、αT2L }: I0M(α)=I0M(α+
αT).Wherein, αTminIndicate that the minimum of zero-sequence current fundamental wave peak value closes a floodgate the period, αT1、αT2... respectively indicate zero-sequence current fundamental wave
Each switching angle period of peak value, I0MThe zero-sequence current peak value that (α) is switching angle when being α,αTFor zero-sequence current fundamental wave peak value
The switching angle period.
4.5 is obtained using 4.3,4.4 | | αi| | and αTmin, calculate zero-sequenceprotection malfunction risk probability:
Step 5: when the parameter of missing is double parameters or more, establishing transformer many reference amounts missing protection model, calculate
Transformer zero-sequenceprotection malfunction risk probability.
Typically different remanent magnetism parameter when choosing the air-drop of n group transformer (can for this transformer history air-drop data or other
Transformer drops data), every group of remanent magnetism as known parameter and is substituted into relevant calculation, only switching angle is unknown in repetition (1)
Risk assessment probability under single parameter information missing scene solves, i-th section of zero-sequenceprotection malfunction under every group of remanent magnetism parameter of gained
Probability is PWL(X).i.In conjunction with the aggregative weighted probability of lower the acquired zero-sequenceprotection malfunction risk assessment of different groups of remanent magnetism parameters are as follows:
In formula, JXWeight by acquiring zero-sequenceprotection malfunction risk under same group of remanent magnetism parameter, different section zero-sequenceprotections
The weight of malfunction probability is identical, andPWL(X).iIndicate the lower i-th section of zero-sequenceprotection malfunction probability of Group X remanent magnetism parameter.
Step 6: the transformer zero-sequenceprotection malfunction risk probability being calculated according to step 2,4,5 judges according to following table
Whether transformer can put into operation.
The different malfunction probability of table 1 correspond to risk assessment
For malfunction probability is the operation of 0 parameter completeness, has been subjected to simulation calculation inverting reasoning and obtain transformation
Device air-drop not will lead to zero-sequence current protection malfunction；It is Deletional for parameter of the malfunction probability in (0,0.2) section operation and
Speech, transformer air-drop have smaller risk to lead to zero-sequence current protection malfunction, since risk is smaller, can also carry out the throwing of transformer
Fortune.And for malfunction probability for the Deletional operation of parameter in (0.2,0.7) and (0.7,1.0) section, transformer air-drop has
Medium and high risk leads to zero-sequence current protection malfunction, it is proposed that does not put into operation to transformer.The parameter for being 1 for malfunction probability
For the operation of completeness, zero-sequence current protection malfunction at this time whether has been that deterministic case is certain to malfunction, and risk reaches most
High level.
Although a specific embodiment of the invention is described in detail and is described in conjunction with Figure of description, ability
Field technique personnel are it should be understood that embodiment of above is only the preferred embodiments of the invention, and explanation is intended merely to help in detail
Reader is helped to more fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on of the invention
Any improvement or modification made by spirit should all be fallen within the scope and spirit of the invention.
Claims (6)
1. the appraisal procedure that a kind of excitation surge current leads to protective relaying maloperation risk, which is characterized in that the appraisal procedure includes
Following steps:
Step 1: acquisition transformer parameter information and the integrality for combining actual operating mode verifying parameter information, if parameter is believed
Breath completely then enters step 2, otherwise enters step 3；
Step 2: in system with effectively earthed neutral, under transformer during no-load closing and the complete situation of each parameter information, according to
Topological zero-sequence network establishes the complete tranformer protection model of parameter, judges transformer zero-sequenceprotection malfunction risk probability；
Step 3: in system with effectively earthed neutral, when transformer during no-load closing, judge whether to lack single parameter information, if
It is to enter step 4, otherwise enters step 5；
Step 4: in the case where lacking single parameter information, establishing the protection model of transformer list parameter information missing, calculate zero
Sequence false protection risk probability；
Step 5: when the parameter of missing is double parameters or more, establishing transformer many reference amounts missing protection model, calculate transformation
Device zero-sequenceprotection malfunction risk probability；
Step 6: the transformer zero-sequenceprotection malfunction risk probability being calculated according to step 2,4,5 judges transformation according to following table
Whether device can put into operation:
2. the appraisal procedure that excitation surge current according to claim 1 leads to protective relaying maloperation risk, it is characterised in that:
In step 1, the parameter information in practical risk assessment includes system voltage, switching angle, iron core remanent magnetism, transformer appearance
Amount, transformer connection mode, core material, system impedance, when above-mentioned parameter information is completely complete, it is believed that parameter information is complete
It is whole；When scarce one item missing and the above parameter information, then it is assumed that parameter information is imperfect.
3. the appraisal procedure that excitation surge current according to claim 1 leads to protective relaying maloperation risk, it is characterised in that:
In step 2, include based on the complete tranformer protection model calculating transformer zero-sequenceprotection malfunction risk probability of parameter
The following contents:
2.1 acquire the fundametal compoment I that transformer primary side zero sequence is shoved by Fourier decompositionμ0；
2.2 obtain its peak I in the way of difference or derivation0M；
2.3 i-th sections of zero-sequence current protections meet formulaWhen, then the probability of this section of false protection is set as PWL.i=1, instead
Its probability be PWL.i=0；Wherein, I0set.iThe setting current of i-th section of zero-sequence current protection, tiFor this section protection adjusting when
Between, τ is damping time constant.
4. the appraisal procedure that excitation surge current according to claim 1 leads to protective relaying maloperation risk, it is characterised in that:
In step 4, the protection model based on transformer list parameter information missing calculates zero-sequenceprotection malfunction risk probability
The following contents:
4.1, which calculate zero sequence according to Given information, shoves fundamental wave attenuation constantWherein, RsFor system equivalent resistance,
LsFor system equivalent inductance, Rσ、LσRespectively transformer first winding ohmic leakage and leakage inductance, Rm、LmRespectively transformer is equivalent
Excitation resistance and equivalent magnetizing inductance；
4.2 utilize the setting current I of each section of zero-sequence current protection0set.iWith adjusting actuation time ti, counter to release each section of protection act
Minimum zero sequence fundamental wave peak valueWherein, I0set.iFor the setting current of i-th section of zero-sequence current protection, ti
For the setting time of this section protection, τ is damping time constant；
4.3 determine the combined floodgate limiting angle α of zero-sequenceprotection malfunctioniL、αiRAnd corresponding combined floodgate siding-to-siding block length | | αi| |, the combined floodgate limit
Angle passes throughIt determines, it is contemplated that there may be multiple conjunctions in a cycle
Lock limiting angle, combined floodgate siding-to-siding block length are defined as | | αi| |=αiR-αiL, α in formulaiL、αiRFor adjacent two combined floodgates limiting angle, and αiL<
αiR；Wherein, I0M(αi) it is switching angle αiWhen i-th section of zero-sequence current peak value, I0M(αiL) when being the switching angle of minimum limit value the
I sections of zero-sequence current peak values, I0M(αiR) be threshold limit value switching angle when i-th section of zero-sequence current peak value.
4.4 determine the minimum combined floodgate period alpha of zero-sequence current fundamental wave peak valueTmin=min { αT1、αT2……}；I0M(α)=I0M(α+
αT)；Wherein, αTminIndicate that the minimum of zero-sequence current fundamental wave peak value closes a floodgate the period, αT1、αT2... respectively indicate zero-sequence current fundamental wave
Each switching angle period of peak value, I0MThe zero-sequence current peak value that (α) is switching angle when being α, αTFor zero-sequence current fundamental wave peak value
The switching angle period.
4.5 utilize 4.3,4.4 obtained combined floodgate siding-to-siding block lengths | | αi| | and the minimum of zero-sequence current fundamental wave peak value closes a floodgate the period
αTmin, calculate zero-sequenceprotection malfunction risk probability:
5. the appraisal procedure that excitation surge current according to claim 1 leads to protective relaying maloperation risk, it is characterised in that:
In steps of 5, lacking protection model calculating transformer zero-sequenceprotection malfunction risk probability according to transformer many reference amounts includes
The following contents:
Difference group iron core remanent magnetism parameter when n group transformer drops is chosen, using every group of iron core remanent magnetism as known parameter, according to only closing
Risk assessment probability under the unknown single parameter information missing scene in lock angle solves, and is calculated lower i-th section of every group of remanent magnetism parameter
Zero-sequenceprotection malfunction probability is PWL(X).i, in conjunction with the synthesis of lower the acquired zero-sequenceprotection malfunction risk assessment of different groups of remanent magnetism parameters
Probability-weighted are as follows:
In formula, JXWeight by acquiring zero-sequenceprotection malfunction risk under same group of remanent magnetism parameter, difference group zero-sequenceprotection malfunction are general
The weight of rate is identical, andPWL(X).iIndicate the lower i-th section of zero-sequenceprotection malfunction probability of Group X remanent magnetism parameter.
6. the appraisal procedure that excitation surge current according to claim 5 leads to protective relaying maloperation risk, it is characterised in that:
In steps of 5, difference iron core remanent magnetism parameter is that this transformer history drops data or other transformations when transformer drops
Device drops data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265972A (en) * | 2019-06-14 | 2019-09-20 | 华中科技大学 | A kind of zero-sequence current protection setting method |
| CN112508313A (en) * | 2019-08-28 | 2021-03-16 | 北京科东电力控制系统有限责任公司 | Method, device and system for evaluating operation sequence of recoverable equipment after fault |
| CN117686757A (en) * | 2023-12-07 | 2024-03-12 | 浙江万昌电力设备有限公司 | Intelligent early warning method and system for outdoor power metering box |
| CN117686757B (en) * | 2023-12-07 | 2024-06-11 | 浙江万昌电力设备有限公司 | Intelligent early warning method and system for outdoor power metering box |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265972A (en) * | 2019-06-14 | 2019-09-20 | 华中科技大学 | A kind of zero-sequence current protection setting method |
| CN110265972B (en) * | 2019-06-14 | 2020-10-16 | 华中科技大学 | Zero-sequence current protection setting method |
| CN112508313A (en) * | 2019-08-28 | 2021-03-16 | 北京科东电力控制系统有限责任公司 | Method, device and system for evaluating operation sequence of recoverable equipment after fault |
| CN112508313B (en) * | 2019-08-28 | 2022-09-09 | 北京科东电力控制系统有限责任公司 | Method, device and system for evaluating operation sequence of recoverable equipment after fault |
| CN117686757A (en) * | 2023-12-07 | 2024-03-12 | 浙江万昌电力设备有限公司 | Intelligent early warning method and system for outdoor power metering box |
| CN117686757B (en) * | 2023-12-07 | 2024-06-11 | 浙江万昌电力设备有限公司 | Intelligent early warning method and system for outdoor power metering box |
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