CN117269829A - Method and system for identifying turn-to-turn short circuit faults of dry type air-core reactor - Google Patents
Method and system for identifying turn-to-turn short circuit faults of dry type air-core reactor Download PDFInfo
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Abstract
The invention discloses a method and a system for identifying turn-to-turn short circuit faults of a dry type air-core reactor, wherein the method comprises the following steps: judging a fault factor of the turn-to-turn short circuit fault of the dry air-core reactor by utilizing the equivalent resistance and the effective power structure of the dry air-core reactor, wherein the fault factor has an amplifying function on a detection signal of the turn-to-turn fault; and carrying out on-line detection on turn-to-turn short circuit faults of the dry type air core reactor by utilizing the fault factors. The method for identifying the inter-turn short circuit faults of the dry air reactor provided by the invention utilizes the equivalent resistance and the active power structure to judge the fault factor of the inter-turn short circuit faults of the dry air reactor, and the fault factor can amplify the detection signals of the inter-turn faults, so that the fault factor can be used for carrying out on-line monitoring and identification on the inter-turn short circuit faults in the dry air reactor, and meanwhile, the method also has higher identification sensitivity on slight inter-turn faults, and improves the accuracy and reliability of the inter-turn short circuit fault detection.
Description
Technical Field
The invention belongs to the technical field of reactor fault detection, and particularly relates to a method and a system for identifying turn-to-turn short circuit faults of a dry type air-core reactor.
Background
The dry type air core reactor has the advantages of simple structure, good linearity, low cost and the like, and is widely used in a power grid. Because of reasons such as local overheating, poor heat dissipation, dendritic discharge and the like during operation, turn-to-turn short circuit faults of the reactor are easy to occur, and accidents frequently occur, the working state of the reactor needs to be monitored in real time, and accidents are avoided.
The monitoring technology of the dry type air-core reactor mainly comprises an electric quantity monitoring method, a smoke sensing monitoring method and a temperature sensing monitoring method. The smoke sensing monitoring method and the temperature sensing monitoring method are greatly influenced by the environment, and signals cannot be detected in time at the initial stage of failure; the electric quantity monitoring method is a direct detection method, is easy to install and is not influenced by the structure of the reactor, however, the sensitivity of the method is low, and therefore, the electric signals need to be subjected to differentiation processing. Currently, several electrical quantity monitoring methods are relatively common, including: (1) The fault signal is amplified through the overvoltage at the moment of switching the reactor, and the method is not suitable for the situation that turn-to-turn short circuit occurs during operation, namely real-time monitoring cannot be realized; (2) Judging the turn-to-turn fault short circuit by increasing the fault signal of the frequency amplification turn-to-turn short circuit or by the signal difference of traveling wave reflection, wherein the two modes are only suitable for maintenance monitoring after disassembly and cannot realize on-line monitoring; (3) By installing the coupling device at the end part of the reactor, whether the impulse frequency response curve deviates or not is observed to judge faults, but the device is difficult to install for the reactor with the rain hat, and the application range is limited; (4) And the equivalent resistance or active power is used for directly judging the direct fault short circuit, and the two modes have low sensitivity for identifying weak faults, so that the reliability and the accuracy of fault monitoring are affected.
Disclosure of Invention
In order to solve the problems that the existing electrical quantity monitoring method is low in identification sensitivity or cannot realize on-line monitoring, the invention provides a method and a system for identifying turn-to-turn short circuit faults of a dry air-core reactor.
The invention is realized by the following technical scheme:
a method for identifying turn-to-turn short circuit faults of a dry type air-core reactor comprises the following steps:
judging a fault factor of the turn-to-turn short circuit fault of the dry air-core reactor by utilizing the equivalent resistance and the effective power structure of the dry air-core reactor, wherein the fault factor has an amplifying function on a detection signal of the turn-to-turn fault;
and carrying out on-line detection on turn-to-turn short circuit faults of the dry type air core reactor by utilizing the fault factors.
The existing air-core reactor turn-to-turn short circuit fault detection technology based on electric quantity has low sensitivity in identifying slight faults among the turns inside the dry-type air-core reactor or cannot be monitored on line. The method for identifying the inter-turn short circuit faults of the dry air-core reactor utilizes the equivalent resistance and the active power structure to judge the fault factors of the inter-turn short circuit faults of the dry air-core reactor, and the fault factors can amplify detection signals of the inter-turn faults, so that the fault factors can be used for carrying out on-line monitoring and identification on the inter-turn short circuit faults in the dry air-core reactor, meanwhile, the method also has higher identification sensitivity on slight inter-turn faults, and the accuracy and reliability of the inter-turn short circuit fault detection are improved.
As a preferred embodiment, the fault factor of the present configuration is expressed as:
PLF＝((P sc /P N ) 2 +(R sc /R N ) 2 )/2
wherein P is sc And P N Active power under turn-to-turn short circuit fault and normal condition respectively; r is R sc And R is N Respectively turn-to-turn short circuit fault and equivalent resistance under normal condition.
In order to further improve the recognition sensitivity of the inter-turn short circuit faults, the invention optimizes the constructed fault factors so as to further improve the reliability and accuracy of inter-turn fault detection.
As a preferred embodiment, the method of the present invention further comprises:
optimizing the constructed fault factors, wherein the optimized fault factors are expressed as:
PLF A ＝(R sc /R N ) 2
wherein R is sc And R is N Respectively turn-to-turn short circuit fault and equivalent resistance under normal condition.
As a preferred embodiment, the method of the present invention further comprises:
optimizing the constructed fault factors, wherein the optimized fault factors are expressed as:
PLF(a)＝(R sc /R N ) a
＝(1+(R sc -R N )/R N ) a
＝(1+X R ) a
wherein a is the coefficient of the fault factor, X R ＝(R sc -R N )/R N 。
In the present invention, as a preferred embodiment, the same X R Since the larger the value of a is, the larger the value of PLF (a) is, and the higher the recognition sensitivity is, a slight fault is determined by increasing the coefficient a of the fault factor at the initial stage of the local turn-to-turn short circuit fault.
Although the larger the coefficient a is, the larger the value of PLF (a) is, the higher the sensitivity of judging a slight failure is, but the larger the influence of the end electric quantity fluctuation is, the larger the risk of erroneous judgment is. Therefore, the optimization selection of the coefficient of the fault factor is also needed, and the high sensitivity and the low misjudgment risk are both considered, so that the reliability and the accuracy of fault detection are further ensured. Thus, as a preferred embodiment, the method of the present invention further comprises:
according to the principle of no misoperation and the principle of no rejection, the optimal value of the coefficient a of the fault factor is determined by utilizing the simulation calculation of the factory design parameters of the dry type air core reactor;
wherein, the principle of no misoperation: the value of the coefficient a should meet the fluctuation range of the fault factor obtained by simulation in the fault-free state and fluctuates in a preset range, so that the fault-free state is not recognized as an inter-turn short circuit fault state; the preset range is a reference value + -threshold value, wherein the reference value is a value of a fault factor obtained by simulation when no fault exists, and the threshold value is 2% -15%;
principle of non-movement: the value of the coefficient a should meet the requirement that the turn-to-turn short circuit fault can be identified under the condition that the turn-to-turn short circuit fault of the transition resistance is determined by utilizing the factory design parameters of the dry type air-core reactor, namely, the fault factor obtained through simulation fluctuates outside a preset range;
the optimal value of the coefficient a is a value which meets the principle of no misoperation and the principle of no refusal.
As a preferred embodiment, the invention utilizes the fault factor to detect the turn-to-turn short circuit fault of the dry air reactor on line, and specifically comprises the following steps:
collecting the electric quantity of the end part of the dry type air-core reactor in real time during operation;
obtaining a fault factor according to the electrical quantity acquired in real time;
and when the calculated fault factor exceeds a preset range, judging that the inter-turn short circuit fault exists in the dry type air-core reactor.
In a second aspect, the present invention provides a system for identifying turn-to-turn short circuit faults of a dry air-core reactor, the system comprising:
the fault factor construction unit is used for judging the fault factor of the turn-to-turn short circuit fault of the dry type air-core reactor by utilizing the equivalent resistance and the active power construction of the dry type air-core reactor, and the fault factor has an amplifying effect on the detection signal of the turn-to-turn fault;
and the online detection unit is used for carrying out online detection on the turn-to-turn short circuit fault of the dry type air core reactor by utilizing the fault factor.
In a third aspect, the invention proposes an electronic device comprising a memory storing a computer program and a processor implementing the steps of the method of the invention when the processor executes the computer program.
In a fourth aspect, the invention proposes a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to the invention.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention judges the fault factor of the inter-turn short circuit fault in the dry type air core reactor by utilizing the equivalent resistance and the active power structure, and the fault factor can amplify the detection signal of the inter-turn fault in the dry type air core reactor, so that the fault factor can be used for carrying out on-line monitoring and identification on the inter-turn short circuit fault in the dry type air core reactor, and meanwhile, the invention has higher identification sensitivity on slight inter-turn faults and improves the accuracy and reliability of the inter-turn short circuit fault detection;
2. the invention optimizes the constructed fault factors to further improve the reliability and accuracy of the inter-turn fault detection, and sets the coefficient of the fault factors, and the larger the coefficient is, the higher the identification sensitivity is, so that the slight fault can be effectively identified by increasing the coefficient of the fault factors at the initial stage of the local inter-turn short circuit fault;
3. the invention also carries out optimization selection on the coefficient of the fault factor, thereby improving the fault recognition sensitivity, avoiding increasing the risk of error judgment caused by the influence of the fluctuation of the electric quantity of the end part and further ensuring the reliability and the accuracy of fault detection.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic flow chart of a method according to an embodiment of the invention;
FIG. 2 is a system schematic block diagram of an embodiment of the present invention;
fig. 3 is a diagram of an equivalent circuit of a turn-to-turn short circuit fault of a dry air reactor;
FIG. 4 is a graph showing the variation of the fault factor with the index a obtained by the simulation test;
fig. 5 is a graph showing the change of the fault factor with time at an index a=3;
fig. 6 is a graph showing the change of the fault factor with time at an index a=5;
fig. 7 is a graph showing the change of the fault factor with time at an index a=10.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
the existing air-core reactor turn-to-turn short circuit fault detection technology based on electric quantity has low sensitivity in identifying slight faults among the turns inside the dry-type air-core reactor or cannot be monitored on line. Based on the above, the embodiment provides a method for identifying turn-to-turn short circuit faults of a dry type air-core reactor.
From the existing research results, it is known that: in the initial period of the inter-turn fault of the reactor, during the partial inter-turn short circuit fault, an insulating material is not completely damaged, a transition resistance exists in partial contact between short circuit ring wires, the short circuit ring current is large, the partial temperature is high, the change of the electric quantity (such as current, voltage, active power, reactive power and power factor) at the end part of the dry type air-core reactor is not obvious, the insulating layer is further aged, the short circuit ring wires are completely contacted, after the complete inter-turn short circuit fault occurs, the change of the electric quantity at the end part is increased compared with the prior art, but the bus current and the equivalent inductance are almost unchanged, and the equivalent resistance and the active power are obviously increased, so that the embodiment judges the fault factor of the inter-turn short circuit fault through the equivalent resistance and the active power structure, and amplifies the detection signal of the inter-turn fault by utilizing the fault factor, and can be used for carrying out on-line monitoring and identification on the inter-turn short circuit fault inside the dry type air-core reactor, and has higher identification sensitivity on the inter-turn slight fault, and improves the accuracy and reliability of inter-turn short circuit fault detection.
As shown in fig. 1, the fault identification method provided in this embodiment specifically includes the following steps:
and step 1, judging a fault factor of the turn-to-turn short circuit fault of the dry type air-core reactor by utilizing an equivalent resistance and active power structure of the dry type air-core reactor, wherein the fault factor has an amplifying function on a detection signal of the turn-to-turn fault.
And 2, carrying out on-line detection on turn-to-turn short circuit faults of the dry type air-core reactor by using fault factors.
According to the method, the fault factor of the turn-to-turn short circuit fault of the dry air reactor is judged by utilizing the equivalent resistor and the active power structure, the fault factor has an amplifying function on the detection signal of the turn-to-turn fault, the turn-to-turn weak fault signal can be effectively identified, the identification sensitivity is improved, and the reliability and the accuracy of fault monitoring are ensured.
In an alternative embodiment, the fault factor of the construction is specifically:
PLF＝((P sc /P N ) 2 +(R sc /R N ) 2 )/2 (1)
wherein P is sc And P N Active power under turn-to-turn short circuit fault and normal condition respectively; r is R sc And R is N Respectively turn-to-turn short circuit fault and equivalent resistance under normal condition.
In an alternative embodiment, the fault identification method further includes, after the constructing the fault factor step: optimizing the constructed fault factors once to obtain optimized fault factors; and carrying out online detection by using the optimized fault factors. Specifically, the original fault factor is shown in formula (1), if the turn-to-turn short circuit fault and the bus current under normal condition are respectively recorded as I sc And I N P is then sc ＝I sc 2 R sc ，P N ＝I N 2 R N . The bus current basically has no change after the turn-to-turn short circuit fault of the dry air reactor, namely I sc /I N 1, where I sc And I N Bus currents under turn-to-turn short circuit fault and normal conditions, respectively, so the original fault factor can be approximated as:
PLF＝(((I sc 2 R sc )/(I N 2 R N )) 2 +(R sc /R N ) 2 )/2
＝(((I sc /I N ) 4 +1)(R sc /R N ) 2 )/2
≈(R sc /R N ) 2
the optimized fault factor may be expressed as:
PLF A ＝(R sc /R N ) 2 (2)
in an alternative embodiment, the fault identification method further includes, after the constructing the fault factor step: performing secondary optimization on the constructed fault factors to obtain optimized fault factors; determining the optimal parameters of the optimized fault factors by using a noise analysis method; and carrying out online detection by utilizing the fault factors for determining the optimal parameters. Specifically, the original fault factor is shown in formula (1), the original fault factor is optimized once to obtain the fault factor shown in formula (2), and the early fault transition resistance of the dry air reactor is considered to be larger, PLF and PLF A The change value is not obvious, i.e., the recognition sensitivity is to be further improved, and therefore, the PLF represented by the formula (2) A Performing secondary optimization, and performing PLF A Taking a from the index of (a) yields the fault factor PLF (a), denoted PLF (a) as:
wherein X is R ＝(R sc -R N )/R N The taylor expansion of PLF (a) is:
as can be seen from formula (4), the same X R In this case, the larger the value of a is, the larger the value of PLF (a) is, and the higher the recognition sensitivity is, so that in the initial stage of the local turn-to-turn short circuit fault, the slight fault can be judged by increasing the index (coefficient) a of the fault factor.
Although the larger the index a, the larger the value of PLF (a) and the higher the sensitivity of judging a slight failure, the larger the influence of the end electric quantity fluctuation, the larger the risk of erroneous judgment. Therefore, the value of the index a of the fault factor is determined by utilizing the simulation calculation of the factory design parameters of the dry type air-core reactor according to the principle of no misoperation and no rejection of the identification method, the optimal value of the index a is obtained, the fault identification sensitivity is ensured, the misjudgment risk is reduced, and the detection accuracy and reliability are further improved.
Wherein, the principle of no misoperation: in the absence of faults, i.e. R sc ＝R N PLF (a) (or PLF and PLF) A ) The value of (2) is 1, and is set as a reference value; meanwhile, under the influence of the end electric quantity, the value of PLF (a) can fluctuate, the threshold value for judging faults is set to be 2% -15%, under the influence of the end electric quantity of the dry type air-core reactor, the fault factor is identified as fault-free (namely normal) as long as fluctuating within a preset range (a reference value + -threshold value range), the normal state is not identified as an inter-turn short circuit fault state, and therefore the value of index a is required to meet the fluctuation range of the fault factor when the fault-free is met; the threshold value can be determined according to the end electric quantity fluctuation and the mutual inductance parameter, and preferably, the threshold value adopted in the embodiment is 10%, namely the value of the index a should ensure that the fault factor under the fault-free condition obtained by simulation is smaller than or equal to 1.1 and larger than or equal to 0.9.
Principle of non-movement: the value of the index a should meet the requirement that the turn-to-turn short circuit fault can be accurately identified under the condition that the turn-to-turn short circuit fault of the transition resistance (10-100 omega is preferable) is determined by utilizing the factory design parameters of the dry type air-core reactor; that is, when the threshold value is set to be 10%, and the value of the fault factor at the time of simulation without fault is set to be 1 as a reference value, the fault factor at the time of fault obtained by simulation is greater than 1.1 or less than 0.9.
The optimal value of the index a is a value which simultaneously meets the principle of no misoperation and the principle of no refusal.
In the actual detection process, the electric quantity of the end part of the dry type air-core reactor during operation is collected in real time; obtaining a fault factor according to the electrical quantity acquired in real time; and when the calculated fault factor exceeds a preset range, judging that the inter-turn short circuit fault exists in the dry type air-core reactor.
Based on the same technical conception as the fault identification method, the embodiment also provides a dry type air-core reactor turn-to-turn short circuit fault identification system, and particularly as shown in fig. 2, the system comprises:
and the fault factor construction unit utilizes the equivalent resistance and the active power of the dry air-core reactor to construct and judge the fault factor of the turn-to-turn short circuit fault of the dry air-core reactor, and the fault factor has amplification effect on the detection signal of the turn-to-turn fault.
And the online detection unit is used for online detecting the turn-to-turn short circuit fault of the dry air reactor by utilizing the fault factor.
In an alternative embodiment, the system further comprises:
the optimizing unit is used for carrying out primary or secondary optimization on the constructed fault factors, further improving the fault recognition sensitivity, reducing risks such as misjudgment and the like, and guaranteeing the accuracy and reliability of detection.
Example 2:
in this embodiment, the bkdeckl-20000/35 dry air-core reactor is taken as an example to perform simulation verification on the fault identification method provided in the above embodiment, and the process is specifically as follows:
(1) And establishing an equivalent circuit model of the dry type air-core reactor.
The dry air-core reactor is formed by arranging a plurality of layers of envelopes in parallel, each envelope is formed by connecting a plurality of layers of coils in parallel, and an equivalent circuit when the turn-to-turn short circuit fault state occurs in the nth layer of coils is shown in figure 3. In the figure, I i 、R i And L i Respectively representing the branch current, the direct current resistance and the self inductance of the ith layer of coil; i n+1 、R n+1 And L n+1 Respectively representing the induction current, the direct current resistance and the self inductance of the short circuit ring; r is R f Represents insulation resistance; m is M ij Representing mutual inductance of the ith and jth layers of coils; m is M i(n+1) Representing mutual inductance of the ith layer coil and the short circuit ring; i represents bus current; u represents the terminal voltage.
The turn-to-turn short circuit fault of the local contact of the short circuit ring wire is recorded as a local turn-to-turn short circuit fault; the short circuit ring wire is connected completelyThe turn-to-turn short circuit fault at the time of touch is called as a complete turn-to-turn short circuit fault. R when complete turn-to-turn short circuit fault f =0; r when partial turn-to-turn short circuit fault f ≠0。
The equivalent circuit equation can be expressed as:
(R+jωM)I＝U (5)
wherein,
R＝diag(R 1 ,R 2 ,…,R n +R f ,R n+1 +R f ) (6)
I＝[I 1 ,I 2 ,…,I n ,I n+1 ] T (8)
U＝[U 1 ,U 2 ,…,U n ,U n+1 ] T (9)
in U n+1 =0, indicating the induced voltage of the shorting ring.
(2) And obtaining relevant parameters of the BKDCKL-20000/35 type reactor.
The obtained relevant parameters of the dry type air reactor comprise: rated capacity is 20000kvar, rated voltage is 35kV, rated frequency is 50Hz, rated reactance is 20Ω, and DC resistance is 0.04 Ω.
(3) And performing simulation test.
Substituting the related parameters of the dry type air reactor into an equivalent circuit in MATLAB, and taking R f When=5, 8, 10Ω, the equations (5) - (9) were found by simulation, and the change curve of PLF (a) with a was obtained as shown in fig. 4. As can be seen from the figure, the larger a is, the larger PLF (a) is, and the more slight faults at different transition resistance values can be distinguished, so that the fault can be judged by increasing the index a of the fault factor at the initial stage of the local turn-to-turn short circuit fault.
(4) And (3) considering a simulation test of the influence of the electric parameter fluctuation of the power grid, and determining the optimal value of the index a.
The electric power system has fluctuation in operation, and the electric parameters are not stable. Thus providing electricityAfter the reactor runs for 2 seconds, a slight turn-to-turn short circuit fault occurs, R is taken f The time-dependent change of the fault factor when a=100 Ω, a=3, 5, 10 is shown in fig. 5 to 7. As can be seen from the graph, the malfunction factor is abnormal when the reactor runs for 2s, and deviates from the normal fluctuation range, namely, the turn-to-turn short circuit fault of the reactor can be effectively identified by using the fault factor provided in the embodiment 1. Although the larger the value of a, the higher the sensitivity of the failure factor as a failure evaluation index. However, due to system fluctuation, the fault factor is easy to exceed the limit in the normal working state, as in fig. 6-7, and the value of some fault factors in the normal state exceeds the normal fluctuation range, so that erroneous judgment can be caused. Therefore, the value of a for the fault factor should be selected in conjunction with noise analysis. For the reactor under study, when a=3, the fault factor will not generate erroneous judgment and the fault signal is obvious, as shown in fig. 5, so in this embodiment, a=3 may be selected as the optimal parameter of the fault factor, so as to improve the fault recognition sensitivity, reduce the risk of erroneous judgment, and ensure the reliability and stability of fault detection.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The method for identifying the turn-to-turn short circuit fault of the dry type air-core reactor is characterized by comprising the following steps of:
judging a fault factor of the turn-to-turn short circuit fault of the dry air-core reactor by utilizing the equivalent resistance and the effective power structure of the dry air-core reactor, wherein the fault factor has an amplifying function on a detection signal of the turn-to-turn fault;
and carrying out on-line detection on turn-to-turn short circuit faults of the dry type air core reactor by utilizing the fault factors.
2. The method for identifying turn-to-turn short circuit faults of dry air reactors according to claim 1, wherein the constructed fault factors are expressed as:
PLF＝((P sc /P N ) 2 +(R sc /R N ) 2 )/2
wherein P is sc And P N Active power under turn-to-turn short circuit fault and normal condition respectively; r is R sc And R is N Respectively turn-to-turn short circuit fault and equivalent resistance under normal condition.
3. The method for identifying turn-to-turn short circuit faults of a dry air reactor according to claim 1, further comprising:
optimizing the constructed fault factors, wherein the optimized fault factors are expressed as:
PLF A ＝(R sc /R N ) 2
wherein R is sc And R is N Respectively turn-to-turn short circuit fault and equivalent resistance under normal condition.
4. The method for identifying turn-to-turn short circuit faults of a dry air reactor according to claim 1, further comprising:
optimizing the constructed fault factors, wherein the optimized fault factors are expressed as:
PLF(a)＝(R sc /R N ) a
＝(1+(R sc -R N )/R N ) a
＝(1+X R ) a
wherein a is the coefficient of the fault factor, X R ＝(R sc -R N )/R N 。
5. The method for identifying turn-to-turn short circuit faults of dry air reactor as claimed in claim 4 and characterized in that same X R When a is larger, PLF (a) is larger, and recognition sensitivity is higher, so that local turn-to-turn short circuit is causedIn the early stage of the fault, the slight fault is judged by increasing the coefficient a of the fault factor.
6. The method for identifying a turn-to-turn short circuit fault of a dry air reactor of claim 4, further comprising:
according to the principle of no misoperation and the principle of no rejection, the optimal value of the coefficient a of the fault factor is determined by utilizing the simulation calculation of the factory design parameters of the dry type air core reactor;
wherein, the principle of no misoperation: the value of the coefficient a should meet the fluctuation range of the fault factor obtained by simulation in the fault-free state and fluctuates in a preset range, so that the fault-free state is not recognized as an inter-turn short circuit fault state; the preset range is a reference value + -threshold value, wherein the reference value is a value of a fault factor obtained by simulation when no fault exists, and the threshold value is 2% -15%;
principle of non-movement: the value of the coefficient a should meet the requirement that the turn-to-turn short circuit fault can be identified under the condition that the turn-to-turn short circuit fault of the transition resistance is determined by utilizing the factory design parameters of the dry type air-core reactor, namely, the fault factor obtained through simulation fluctuates outside a preset range;
the optimal value of the coefficient a is a value which meets the principle of no misoperation and the principle of no refusal.
7. The method for identifying the turn-to-turn short circuit fault of the dry air reactor according to claim 1, wherein the method is characterized in that the turn-to-turn short circuit fault of the dry air reactor is detected on line by using a fault factor, and specifically comprises the following steps:
collecting the electric quantity of the end part of the dry type air-core reactor in real time during operation;
obtaining a fault factor according to the electrical quantity acquired in real time;
and when the calculated fault factor exceeds a preset range, judging that the inter-turn short circuit fault exists in the dry type air-core reactor.
8. A dry air reactor turn-to-turn short circuit fault identification system, comprising:
the fault factor construction unit is used for judging the fault factor of the turn-to-turn short circuit fault of the dry type air-core reactor by utilizing the equivalent resistance and the active power construction of the dry type air-core reactor, and the fault factor has an amplifying effect on the detection signal of the turn-to-turn fault;
and the online detection unit is used for carrying out online detection on the turn-to-turn short circuit fault of the dry type air core reactor by utilizing the fault factor.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of claims 1-7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665648A (en) * | 2024-02-02 | 2024-03-08 | 国网安徽省电力有限公司电力科学研究院 | Single-phase grounding fault identification method and device |
| CN117665648B (en) * | 2024-02-02 | 2024-04-19 | 国网安徽省电力有限公司电力科学研究院 | Single-phase grounding fault identification method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665648A (en) * | 2024-02-02 | 2024-03-08 | 国网安徽省电力有限公司电力科学研究院 | Single-phase grounding fault identification method and device |
| CN117665648B (en) * | 2024-02-02 | 2024-04-19 | 国网安徽省电力有限公司电力科学研究院 | Single-phase grounding fault identification method and device |
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