CN116430279A - Method and device for evaluating turn-to-turn short circuit fault of transformer - Google Patents
Method and device for evaluating turn-to-turn short circuit fault of transformer Download PDFInfo
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- G—PHYSICS
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Abstract
The invention relates to the technical field of transformers, in particular to a method and a device for evaluating turn-to-turn short circuit faults of a transformer, wherein the method comprises the following steps: disassembly inspection is carried out on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position; establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer; simulating the failed transformer based on a transformer short-circuit turn-to-turn short circuit simulation test jumper board; and verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result. According to the invention, a preliminary conclusion of the occurrence of faults of the transformer is obtained through disassembly inspection, and the simulation is carried out by combining a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer with a simulation test jumper board for the short-circuit turn-to-turn short circuit of the transformer, so that a final conclusion of the faults is obtained, and the evaluation and diagnosis efficiency of the transformer when the turn-to-turn short circuit faults occur is improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for evaluating turn-to-turn short circuit faults of a transformer.
Background
At present, with the rapid development of science and technology in China, the electricity consumption is greatly increased, the large-scale development of a digital power grid is also indispensable for adapting to electricity consumption conditions, with the development of the digital power grid, the informatization, the automation and the intellectualization in the aspects of power generation and power transmission are basically realized in China, but a large development space still exists in the aspects of power distribution and power consumption.
When a large-scale access digital power grid is carried out on a large power load, and voltage fluctuation of a power transmission line is large, a transformer is prone to faults, and faults related to the transformer generally comprise inter-phase short circuits, single-phase-to-phase short circuits, inter-turn short circuits and the like. One of the most common types of faults is inter-turn short circuit faults, which are common internal insulation faults of transformers, and for large transformers, the number of inter-turn short circuit faults is up to 60% -70% of the faults of the power system. The early diagnosis and preventive measures for exposing the turn-to-turn insulation of the transformer at such a high fault rate are limited, and in fact, the electric quantity change of the winding end part after the occurrence of the mild turn-to-turn short circuit in the operation of the field transformer is small, relay protection equipment is difficult to effectively identify and cut off the fault, so that the fault is converted into a more serious fault from the turn-to-turn short circuit. Therefore, the calculation and simulation of the turn-to-turn short circuit of the transformer winding are still the research emphasis of the relay protection and fault analysis of the current transformer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method and a device for evaluating turn-to-turn short circuit faults of a transformer.
The invention provides a method for evaluating an inter-short circuit fault of a transformer, which comprises the following steps:
disassembly inspection is carried out on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position;
establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain simulation results;
simulating the failed transformer based on a transformer short-circuit turn-to-turn short circuit simulation test jumper board to obtain a simulation result;
and verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
Further, the disassembly inspection of the failed transformer is performed, and the preliminary conclusion of the failure type and the failure position includes:
and disassembling the failed transformer, checking the appearance of the failed transformer and the internal winding coil, preliminarily judging whether the failure type is inter-turn short circuit failure, and determining the failure position.
Further, the simulating the failed transformer based on the mathematical model for transformer turn-to-turn short circuit fault assessment includes:
calculating a transformation ratio coefficient when the transformer with the fault has turn-to-turn short circuit fault;
calculating a correction coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the relation coefficient of the inductance of each winding of the failed transformer;
and calculating a loop voltage equation set of the failed transformer based on the transformation ratio coefficient and the correction coefficient, and obtaining voltage data of the failed transformer.
Further, the calculating the transformation ratio coefficient when the failed transformer has the turn-to-turn short circuit fault comprises:
and calculating the transformation ratio coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the turn number parameters of the primary side winding and the secondary side winding of the failed transformer.
Further, the calculating the correction coefficient when the turn-to-turn short circuit fault occurs on the transformer based on the relation coefficient of the inductance of each winding of the transformer comprises:
and calculating a correction coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the leakage inductance coefficient of the failed transformer and the inductance relation coefficient of the primary side winding and the secondary side winding.
Further, the simulating the failed transformer based on the mathematical model for transformer turn-to-turn short circuit fault assessment further comprises:
calculating phase winding current of a primary side winding when the transformer with the fault has turn-to-turn short circuit fault;
calculating an equivalent current of the non-shorted partial winding based on the phase winding current of the primary winding;
calculating a phase winding current group of a secondary side winding based on the equivalent current of the non-shorted partial winding;
and obtaining current data of the failed transformer based on the phase winding current group of the secondary side winding.
Further, the transformer based on the transformer short-circuit inter-turn short circuit simulation test jumper board simulates the failed transformer comprises:
and accessing the transformer short-circuit inter-turn short-circuit simulation test jumper board into an internal coil winding of a second transformer, changing the number of turns of the transformer short-circuit inter-turn short-circuit simulation test jumper board accessed into the internal coil winding of the second transformer, recording and analyzing voltage data, and obtaining an inter-turn short-circuit fault voltage simulation result of the second transformer.
Further, the transformer based on the transformer short-circuit inter-turn short circuit simulation test jumper board simulates the failed transformer further comprises:
and connecting the transformer short-circuit inter-turn short-circuit simulation test jumper board to a switch of an internal coil winding of the second transformer, repeatedly shorting and disconnecting the switch, recording and analyzing current data, and obtaining an inter-turn short-circuit fault current simulation result of the second transformer.
Further, the verifying the preliminary conclusion of the fault type and the fault location based on the simulation result and the simulation result includes:
verifying voltage data of the failed transformer based on a turn-to-turn short circuit fault voltage simulation result of the second transformer;
verifying current data of the failed transformer based on a turn-to-turn short circuit fault current simulation result of the second transformer;
and verifying the accuracy of the preliminary conclusion of the fault type and the fault position, and obtaining the final conclusion of the fault type and the fault position of the fault-occurring transformer.
The invention also provides a transformer turn-to-turn short circuit fault assessment device, which comprises:
the disassembly checking module is used for performing disassembly checking on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position;
the simulation module is used for establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain a simulation result;
the simulation module is used for simulating the failed transformer based on the transformer short-circuit inter-turn short circuit simulation test jumper board to obtain a simulation result;
and the verification module is used for verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
According to the invention, through disassembly inspection, a preliminary conclusion of the fault type and the fault position of the transformer with faults is obtained, and a preliminary judgment result of the faults of the transformer is obtained through analysis; the method comprises the steps of carrying out simulation based on a mathematical model of transformer inter-turn short circuit fault evaluation, obtaining working parameters of the failed transformer when the inter-turn short circuit fault occurs through calculating voltage data and current data of the failed transformer, simulating normal working states of the failed transformer based on a transformer short-circuit inter-turn short circuit simulation test jumper plate, obtaining the working parameters of the failed transformer when the failed transformer normally works, analyzing and comparing the working parameters of the failed transformer when the normal work and the inter-turn short circuit fault occur, verifying a preliminary judging result of the failure of the transformer, obtaining a final conclusion of the failure of the transformer, and improving evaluation and diagnosis efficiency when the inter-turn short circuit fault occurs to the transformer.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of transformer turn-to-turn short fault assessment in an embodiment of the invention;
FIG. 2 is a flow chart of simulation based on a mathematical model of transformer turn-to-turn short circuit voltage transformation ratio estimation in an embodiment of the invention;
FIG. 3 is a flow chart of simulation based on a mathematical model of transformer inter-turn short circuit current transient evaluation in an embodiment of the invention;
FIG. 4 is a flow chart of verifying preliminary conclusions about the fault type and fault location in an embodiment of the invention;
fig. 5 is a schematic diagram of a transformer turn-to-turn short fault evaluation apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, it should be understood that terms such as "comprises" or "comprising," etc., are intended to indicate the presence of features, numbers, steps, acts, components, portions, or combinations thereof disclosed in the present specification, and are not intended to exclude the possibility that one or more other features, numbers, steps, acts, components, portions, or combinations thereof are present or added.
In addition, it should be noted that, without conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
The embodiment of the invention relates to a method for evaluating turn-to-turn short circuit faults of a transformer, which comprises the following steps: disassembly inspection is carried out on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position; establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain simulation results; simulating the failed transformer based on a transformer short-circuit turn-to-turn short circuit simulation test jumper board to obtain a simulation result; and verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
In an alternative implementation manner of the present embodiment, as shown in fig. 1, fig. 1 shows a flowchart for evaluating a turn-to-turn short circuit fault of a transformer in an embodiment of the present invention, including the following steps:
s101, carrying out disassembly inspection on a transformer with a fault to obtain a preliminary conclusion of the fault type and the fault position;
in an alternative implementation of this embodiment, the failed transformer is disassembled, and the appearance of the failed transformer and the internal winding coil are checked, and whether the failure type is an inter-turn short circuit failure is primarily determined, and the failure location is determined.
Specifically, for a large transformer, the probability of occurrence of an inter-turn short circuit fault is high, in this step, the failed transformer is disassembled, and the appearance and the internal winding coil thereof are primarily checked, so as to primarily determine whether the fault type of the failed transformer is an inter-turn short circuit fault, and meanwhile, the fault position is checked.
More, if an inter-turn short circuit fault occurs, the damaged part is generally a high-voltage winding coil inside the transformer, and when the high-voltage winding coil is in short circuit, the high-voltage winding coil generally causes ground short circuit breakdown, inter-cake disorder breakdown and inter-turn short circuit breakdown, which are generally large-area discharge ablation marks caused by the short circuit, and the damaged position is likely to occur at the upper part or the lower part of the high-voltage winding coil, so that disassembly inspection of the transformer with the fault is necessary, a preliminary conclusion of the fault cause can be provided, and the diagnosis efficiency is improved.
S102, establishing a mathematical model for transformer inter-turn short circuit fault evaluation, and simulating the failed transformer based on the mathematical model for transformer inter-turn short circuit fault evaluation to obtain a simulation result;
in an optional implementation manner of this embodiment, the transformer inter-turn short circuit fault assessment mathematical model includes two parts, namely a transformer inter-turn short circuit voltage transformation ratio assessment mathematical model and a transformer inter-turn short circuit current transient assessment mathematical model, where the failed transformer is simulated based on the transformer inter-turn short circuit voltage transformation ratio assessment mathematical model and the transformer inter-turn short circuit current transient assessment mathematical model, respectively, to obtain a simulation result.
In an optional implementation manner of this embodiment, the failed transformer is simulated based on a mathematical model for evaluating a turn-to-turn short circuit voltage-to-transformation ratio of the transformer, so as to obtain a simulation result.
Specifically, when a turn-to-turn short circuit fault occurs in the winding coil inside the transformer, the winding coil causing the short circuit is equivalent to a parallel mode, and the number of turns of the winding coil is reduced, so that the voltage of the transformer is changed.
Specifically, as shown in fig. 2, fig. 2 shows a flow chart for simulation based on a mathematical model for transformer turn-to-turn short circuit voltage transformation ratio evaluation in the embodiment of the invention, which comprises the following steps:
s201, calculating a transformation ratio coefficient when the transformer with the fault has turn-to-turn short circuit fault;
in an alternative implementation of this embodiment, the transformation ratio coefficient when the failed transformer has a turn-to-turn short circuit fault is calculated based on the number of turns parameters of the primary and secondary windings of the failed transformer.
Specifically, the calculation formula of the transformation ratio coefficient when the turn-to-turn short circuit fault occurs in the transformer is as follows:
wherein k is ab To change ratio of short-circuited partial winding to non-short-circuited partial winding, k a2 K is the transformation ratio of the secondary side winding to the non-short circuit part winding b2 N is the transformation ratio of the secondary side winding and the short circuit part winding 1 N is the number of turns of the primary winding 2 The number of turns of the secondary winding is k is the transformation ratio of the transformer in normal operation, and x is the ratio of the number of turns of the short-circuit line of the primary winding to the total number of turns, and x is more than 0 and less than 1.
Specifically, when the transformer has turn-to-turn short circuit fault, if the number of turns of the short circuit part is small, the winding of the non-short circuit part also has the function of supporting alternating voltage, and compared with the normal operation, the number of turns of the effective winding is reduced, so that the transformation ratio of the short circuit part and the non-short circuit part in the secondary side winding and the primary side winding is changed.
S202, calculating a correction coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the relation coefficient of the inductance of each winding of the failed transformer;
in an alternative implementation manner of the present embodiment, the correction coefficient when the turn-to-turn short circuit fault occurs in the failed transformer is calculated based on the leakage inductance coefficient of the failed transformer and the inductance relationship coefficient of the primary side winding and the secondary side winding.
Specifically, the calculation formula of the correction coefficient when the turn-to-turn short circuit fault occurs in the transformer is as follows:
σ ab ＝[x(1-x)] 2 σ 12 、
wherein sigma 12 Is the leakage inductance of the transformer, M 12 Is the mutual inductance of the primary side winding and the secondary side winding, L 1 Is self-inductance of the primary winding without fault, L 2 Is the self-inductance of the secondary winding, sigma ab Leakage magnetic coefficient M when turn-to-turn short circuit fault occurs to transformer ab Is the mutual inductance between the non-short-circuited partial winding and the short-circuited partial winding, L a Is the self-inductance of the partial winding without short circuit, L b For self-inductance of short-circuited partial windings, M a2 Is the mutual inductance between the non-short-circuited partial winding and the secondary side winding, M b2 For mutual inductance of the short-circuited partial winding and the secondary side winding, N a For partial winding turns not shorted, N b For short-circuiting part of winding turns, r x Is the magnetic resistance of the transformer core.
Specifically, when the transformer has an inter-turn short circuit fault, the distribution of the leakage magnetic field around the winding of the internal coil is changed, and the change of the distribution of the leakage magnetic field affects the voltage, so that the leakage magnetic coefficient of the transformer after the inter-turn short circuit fault needs to be corrected.
The correction coefficient is calculated here, which is advantageous for improving the accuracy of calculating the voltage data of the transformer.
And S203, calculating a loop voltage equation set of the failed transformer based on the transformation ratio coefficient and the correction coefficient, and obtaining voltage data of the failed transformer.
In an alternative implementation manner of this embodiment, the failed transformer may equivalently be regarded as a three-winding transformer from a normal two-winding transformer, and the calculation formula of the loop voltage equation set of the failed transformer is as follows:
r a ＝(1-x)r 1 、
r b ＝xr 1 、
U 1 ＝r a I a +jwL a I a +jwM a2 I 2 +jwM ab I b 、
0＝r 2 I 2 +jwM a2 I a +jwL 2 I 2 +jwM b2 I b +Z L I 2 、
0＝r b I b +jwM ab I a +jwM b2 I 2 +jwL b I b ，
wherein r is a As a resistive component of the non-shorted partial winding, r b For short-circuiting the resistive component of a partial winding, r 1 U, which is the resistance of the primary winding 1 For primary side voltage, I a For partial winding current without short circuit, I b To short circuit part of the winding current, I 2 For secondary side winding current, Z L For load impedance, w is angular frequency.
Specifically, the transformation ratio coefficient obtained in step S201 is combined with the correction coefficient obtained in step S202, so as to obtain the loop voltage equation set of the failed transformer at this time.
In an alternative implementation manner of the present embodiment, the failed transformer is simulated based on a mathematical model for evaluating turn-to-turn short circuit current transients of the transformer, so as to obtain a simulation result.
Specifically, when an inter-turn short circuit fault occurs in the coil of the internal winding of the transformer, the voltage of the transformer is changed, and when a short circuit occurs in part of the coil windings, namely the total resistance is changed, the current of the transformer is changed in a transient manner.
Specifically, as shown in fig. 3, fig. 3 shows a flow chart for simulation based on a mathematical model for transformer turn-to-turn short circuit current transient evaluation in an embodiment of the invention, which includes the following steps:
s301, calculating phase winding current of a primary side winding when the transformer with the fault has turn-to-turn short circuit fault;
in an alternative implementation manner of this embodiment, when the transformer has an inter-turn short circuit fault, the short-circuited partial winding and the non-short-circuited partial winding are regarded as two different power supplies with internal resistances, and the sum of the electric potentials of the primary winding is no longer 0, and a loop current will appear, and the loop current of the primary winding, that is, the phase winding current of the primary winding, and the current flowing through the short-circuited partial winding can be obtained, where the calculation formula includes:
wherein I is 1 Phase winding current for primary winding, I b′ For short-circuiting the current of part of the windings, E a Is the electromotive force of the partial winding which is not short-circuited, E b For short-circuiting the electromotive force of part of the windings, E 1 The electromotive force of the primary winding is that x is the ratio of the number of short-circuit turns to the total number of turns of the primary winding, x is more than 0 and less than 1, Z L Is the load impedance.
S302, calculating equivalent current of a non-short-circuited partial winding based on phase winding current of the primary side winding;
in an alternative implementation manner of this embodiment, when a turn-to-turn short circuit fault occurs in a primary winding, an equivalent current of a non-short circuit part winding and a short circuit part winding is configured according to a phase winding current of the primary winding, and a calculation formula includes:
wherein I is a For the winding current of the non-shorted partial winding, I b Is the winding current of the short-circuited partial winding.
S303, calculating a phase winding current group of a secondary side winding based on the equivalent current of the non-short-circuited partial winding;
in an optional implementation manner of this embodiment, the secondary side winding corresponds to the primary side winding with the turn-to-turn short circuit fault, and is equivalent to an un-shorted part winding and a shorted part winding of the secondary side winding, and a calculation formula of a phase winding current set of the secondary side winding is as follows:
wherein I is 2a Phase winding current equivalent to non-shorted portion of secondary side winding, I 2b Phase winding current equivalent to short-circuited portion of secondary side winding, N 1 N is the number of turns of the primary winding 2 Is the number of turns of the secondary winding.
And S304, obtaining current data of the failed transformer based on the phase winding current of the secondary side winding.
In an alternative implementation manner of this embodiment, the calculation formula of the equivalent current of the secondary side winding includes:
wherein I is 2′ Is wound on the secondary sideEquivalent current, F 2′ Is magnetomotive force of the secondary winding.
More, the calculation formula of the phase winding current of the secondary side winding includes:
s103, simulating the failed transformer based on a transformer short-circuit turn-to-turn short circuit simulation test jumper board to obtain a simulation result;
in an optional implementation manner of this embodiment, the transformer short-circuit inter-turn short-circuit simulation test jumper board is connected to the internal coil winding of the second transformer, the number of turns of the transformer short-circuit inter-turn short-circuit simulation test jumper board connected to the internal coil winding of the second transformer is changed, and voltage data is recorded and analyzed to obtain an inter-turn short-circuit fault voltage simulation result of the second transformer.
Specifically, the transformer short-circuit inter-turn short-circuit simulation test jumper board is connected to an internal coil winding of a second transformer, the number of turns of the transformer short-circuit inter-turn short-circuit simulation test jumper board is gradually reduced, voltage data of a primary side winding and a secondary side winding of the second transformer are recorded, and voltage change curves of coil windings with different numbers of short-circuits of the second transformer are obtained through analysis.
It should be noted that the second transformer and the failed transformer are the same type of transformer.
More, the voltage data of the primary side winding and the secondary side winding are sampled synchronously in real time, so that errors generated by voltage fluctuation of a power grid can be simulated and counteracted.
In an optional implementation manner of this embodiment, the transformer short-circuit inter-turn short-circuit simulation test jumper board is connected to a switch of an internal coil winding of the second transformer, repeated short-circuit and disconnection are performed on the switch, current data are recorded and analyzed, and a inter-turn short-circuit fault current simulation result of the second transformer is obtained.
Specifically, the transformer short-circuit inter-turn short circuit simulation test jumper board is connected to a switch of an internal coil winding of a second transformer, repeated short circuit and disconnection are carried out on the switch, current can generate mutation at the moment, current mutation signal data at each moment are recorded, and the current fluctuation amplitude when the inter-turn short circuit fault of the second transformer occurs is obtained through analysis.
The second transformer with the same type as the transformer with the fault is adopted for simulation, so that a relatively accurate simulation result is obtained, and a basis is provided for verifying the accuracy of the preliminary conclusion.
And S104, verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
In an alternative implementation of the present embodiment, as shown in fig. 4, fig. 4 shows a flowchart for verifying the preliminary conclusion of the fault type and the fault location in the embodiment of the present invention, including the following steps:
s401, verifying voltage data of the failed transformer based on a turn-to-turn short circuit fault voltage simulation result of the second transformer;
the voltage change curve of the turn-to-turn short circuit fault voltage simulation result of the second transformer is verified to verify the accuracy of the loop voltage equation set of the failed transformer obtained in step S203.
S402, verifying current data of the failed transformer based on a turn-to-turn short circuit fault current simulation result of the second transformer;
the current fluctuation amplitude of the turn-to-turn short circuit fault current simulation result of the second transformer is used for verifying the accuracy of the phase winding current of the secondary side winding of the failed transformer obtained in the step S304.
S403, verifying the accuracy of the preliminary conclusion of the fault type and the fault position, and obtaining the final conclusion of the fault type and the fault position of the fault-occurring transformer.
In an optional implementation manner of this embodiment, in combination with the turn-to-turn short circuit fault voltage simulation result and the current simulation result of the second transformer and the voltage and current data of the faulty transformer, the accuracy of the preliminary conclusion of the fault type and the fault location is verified, whether the fault is a turn-to-turn short circuit fault is determined, and a final conclusion of the fault type and the fault location of the faulty transformer is obtained.
In summary, the embodiment of the invention provides a method for evaluating turn-to-turn short circuit faults of a transformer, which obtains the preliminary conclusion of the fault type and the fault position of the transformer with faults through disassembly inspection, and analyzes and obtains the preliminary judgment result of the faults of the transformer; the method comprises the steps of carrying out simulation based on a mathematical model of transformer inter-turn short circuit fault evaluation, obtaining working parameters of the failed transformer when the inter-turn short circuit fault occurs through calculating voltage data and current data of the failed transformer, simulating normal working states of the failed transformer based on a transformer short-circuit inter-turn short circuit simulation test jumper plate, obtaining the working parameters of the failed transformer when the failed transformer normally works, analyzing and comparing the working parameters of the failed transformer when the normal work and the inter-turn short circuit fault occur, verifying a preliminary judging result of the failure of the transformer, obtaining a final conclusion of the failure of the transformer, and improving evaluation and diagnosis efficiency when the inter-turn short circuit fault occurs to the transformer.
Example two
The embodiment of the invention also relates to a transformer turn-to-turn short circuit fault evaluation device, as shown in fig. 5, fig. 5 shows a schematic diagram of the transformer turn-to-turn short circuit fault evaluation device in the embodiment of the invention, and the device comprises:
and the disassembly checking module 10 is used for performing disassembly checking on the transformer with faults to obtain a preliminary conclusion of the fault type and the fault position.
Specifically, the failed transformer is disassembled, the appearance of the failed transformer and the internal winding coil are checked, whether the failure type is inter-turn short circuit failure or not is primarily judged, and the failure position is determined.
And the simulation module 20 is used for establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain simulation results.
Specifically, the simulation module 20 includes a voltage simulation module 21 and a current simulation module 22, where the voltage simulation module 21 is used to run a transformer inter-turn short circuit voltage-to-transformation ratio estimation mathematical model, and the current simulation module 22 is used to run a transformer inter-turn short circuit current transient estimation mathematical model.
And the simulation module 30 is used for simulating the failed transformer based on the transformer short-circuit inter-turn short circuit simulation test jumper board to obtain a simulation result.
Specifically, the analog module 30 includes a voltage analog module 31 and a current analog module 32.
In an optional implementation manner of this embodiment, the voltage simulation module 31 accesses the transformer short-circuit inter-turn short-circuit simulation test jumper board to the internal coil winding of the second transformer, changes the number of turns of the internal coil winding of the second transformer accessed to the transformer short-circuit inter-turn short-circuit simulation test jumper board, records and analyzes voltage data, and obtains the inter-turn short-circuit fault voltage simulation result of the second transformer. Specifically, the transformer short-circuit inter-turn short-circuit simulation test jumper board is connected to an internal coil winding of a second transformer, the number of turns of the transformer short-circuit inter-turn short-circuit simulation test jumper board is gradually reduced, voltage data of a primary side winding and a secondary side winding of the second transformer are recorded, and voltage change curves of coil windings with different numbers of short-circuits of the second transformer are obtained through analysis.
It should be noted that the second transformer and the failed transformer are the same type of transformer.
In an alternative implementation manner of this embodiment, the current simulation module 32 inserts the transformer short-circuit inter-turn short-circuit simulation test jumper board onto a switch of an internal coil winding of the second transformer, and repeatedly short-circuits and opens the switch, records and analyzes current data, thereby obtaining an inter-turn short-circuit fault current simulation result of the second transformer.
Specifically, the transformer short-circuit inter-turn short circuit simulation test jumper board is connected to a switch of an internal coil winding of a second transformer, repeated short circuit and disconnection are carried out on the switch, current can generate mutation at the moment, current mutation signal data at each moment are recorded, and the current fluctuation amplitude when the inter-turn short circuit fault of the second transformer occurs is obtained through analysis.
And a verification module 40, configured to verify the preliminary conclusion of the fault type and the fault location based on the simulation result and the simulation result.
It should be noted that the transformer turn-to-turn short circuit fault evaluation device is used for executing the method for evaluating the transformer turn-to-turn short circuit fault.
In summary, the embodiment of the invention provides a transformer turn-to-turn short circuit fault evaluation device, which is used for executing a method for evaluating the transformer turn-to-turn short circuit fault, obtaining a preliminary conclusion of the fault type and the fault position of a faulty transformer through disassembly inspection, and analyzing to obtain a preliminary judgment result of the fault of the transformer; the method comprises the steps of carrying out simulation based on a mathematical model of transformer inter-turn short circuit fault evaluation, obtaining working parameters of the failed transformer when the inter-turn short circuit fault occurs through calculating voltage data and current data of the failed transformer, simulating normal working states of the failed transformer based on a transformer short-circuit inter-turn short circuit simulation test jumper plate, obtaining the working parameters of the failed transformer when the failed transformer normally works, analyzing and comparing the working parameters of the failed transformer when the normal work and the inter-turn short circuit fault occur, verifying a preliminary judging result of the failure of the transformer, obtaining a final conclusion of the failure of the transformer, and improving evaluation and diagnosis efficiency when the inter-turn short circuit fault occurs to the transformer.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
In addition, the foregoing has described in detail embodiments of the present invention, the principles and embodiments of the present invention have been described herein with reference to specific examples, the foregoing examples being provided to facilitate the understanding of the method of the present invention and the core idea thereof; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. A method for transformer turn-to-turn short circuit fault assessment, the method comprising:
disassembly inspection is carried out on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position;
establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain simulation results;
simulating the failed transformer based on a transformer short-circuit turn-to-turn short circuit simulation test jumper board to obtain a simulation result;
and verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
2. The method for transformer turn-to-turn short circuit fault assessment according to claim 1, wherein said performing a disassembly inspection of the failed transformer to arrive at a preliminary conclusion of the fault type and fault location comprises:
and disassembling the failed transformer, checking the appearance of the failed transformer and the internal winding coil, preliminarily judging whether the failure type is inter-turn short circuit failure, and determining the failure position.
3. The method of transformer inter-turn short circuit fault assessment according to claim 1, wherein said simulating the failed transformer based on the transformer inter-turn short circuit fault assessment mathematical model comprises:
calculating a transformation ratio coefficient when the transformer with the fault has turn-to-turn short circuit fault;
calculating a correction coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the relation coefficient of the inductance of each winding of the failed transformer;
and calculating a loop voltage equation set of the failed transformer based on the transformation ratio coefficient and the correction coefficient, and obtaining voltage data of the failed transformer.
4. A method of transformer turn-to-turn short fault assessment as claimed in claim 3 wherein said calculating a transformation ratio coefficient for said failed transformer when a turn-to-turn short fault occurs comprises:
and calculating the transformation ratio coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the turn number parameters of the primary side winding and the secondary side winding of the failed transformer.
5. The method for evaluating a turn-to-turn short circuit fault of a transformer according to claim 4, wherein calculating a correction factor for the occurrence of the turn-to-turn short circuit fault of the transformer based on the relationship factor of the inductances of the windings of the transformer comprises:
and calculating a correction coefficient when the turn-to-turn short circuit fault occurs to the failed transformer based on the leakage inductance coefficient of the failed transformer and the inductance relation coefficient of the primary side winding and the secondary side winding.
6. The method of transformer inter-turn short circuit fault assessment according to claim 5, wherein said simulating the failed transformer based on the transformer inter-turn short circuit fault assessment mathematical model further comprises:
calculating phase winding current of a primary side winding when the transformer with the fault has turn-to-turn short circuit fault;
calculating an equivalent current of the non-shorted partial winding based on the phase winding current of the primary winding;
calculating a phase winding current group of a secondary side winding based on the equivalent current of the non-shorted partial winding;
and obtaining current data of the failed transformer based on the phase winding current group of the secondary side winding.
7. The method of transformer turn-to-turn short circuit fault assessment according to claim 6, wherein said simulating the failed transformer based on the transformer short-to-turn short circuit simulation test jumper plate comprises:
and accessing the transformer short-circuit inter-turn short-circuit simulation test jumper board into an internal coil winding of a second transformer, changing the number of turns of the transformer short-circuit inter-turn short-circuit simulation test jumper board accessed into the internal coil winding of the second transformer, recording and analyzing voltage data, and obtaining an inter-turn short-circuit fault voltage simulation result of the second transformer.
8. The method of transformer inter-turn short circuit fault assessment according to claim 7, wherein the simulating the failed transformer based on the transformer short-turn short circuit simulation test jumper plate further comprises:
and connecting the transformer short-circuit inter-turn short-circuit simulation test jumper board to a switch of an internal coil winding of the second transformer, repeatedly shorting and disconnecting the switch, recording and analyzing current data, and obtaining an inter-turn short-circuit fault current simulation result of the second transformer.
9. The method of transformer turn-to-turn short circuit fault assessment according to claim 8, wherein said verifying preliminary conclusions about the fault type and fault location based on the simulation results and simulation results comprises:
verifying voltage data of the failed transformer based on a turn-to-turn short circuit fault voltage simulation result of the second transformer;
verifying current data of the failed transformer based on a turn-to-turn short circuit fault current simulation result of the second transformer;
and verifying the accuracy of the preliminary conclusion of the fault type and the fault position, and obtaining the final conclusion of the fault type and the fault position of the fault-occurring transformer.
10. An apparatus for evaluating turn-to-turn short circuit faults of a transformer, the apparatus comprising:
the disassembly checking module is used for performing disassembly checking on the transformer with the fault to obtain a preliminary conclusion of the fault type and the fault position;
the simulation module is used for establishing a mathematical model for evaluating the turn-to-turn short circuit faults of the transformer, and simulating the transformer with faults based on the mathematical model for evaluating the turn-to-turn short circuit faults of the transformer to obtain a simulation result;
the simulation module is used for simulating the failed transformer based on the transformer short-circuit inter-turn short circuit simulation test jumper board to obtain a simulation result;
and the verification module is used for verifying the preliminary conclusion of the fault type and the fault position based on the simulation result and the simulation result.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247208A (en) * | 2017-07-20 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of transformer shorted-turn fault location positioning method |
| US20220129603A1 (en) * | 2020-10-27 | 2022-04-28 | University Of South Carolina | Motor winding insulation diagnosis and prognosis using resistance simulation method |
| CN114417574A (en) * | 2021-12-29 | 2022-04-29 | 广东电网有限责任公司 | Method and device for calculating severity of turn-to-turn short circuit |
| CA3192703A1 (en) * | 2020-10-28 | 2022-05-05 | Ying ZUO | Online monitoring and compensation of stator inter-turn short circuit fault in permanent magnet synchronous machines |
| CN115459353A (en) * | 2022-10-19 | 2022-12-09 | 中南大学 | Unified analysis method for contribution of short-circuit current in full-stage of double-fed wind power fault ride-through |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247208A (en) * | 2017-07-20 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of transformer shorted-turn fault location positioning method |
| US20220129603A1 (en) * | 2020-10-27 | 2022-04-28 | University Of South Carolina | Motor winding insulation diagnosis and prognosis using resistance simulation method |
| CA3192703A1 (en) * | 2020-10-28 | 2022-05-05 | Ying ZUO | Online monitoring and compensation of stator inter-turn short circuit fault in permanent magnet synchronous machines |
| CN114417574A (en) * | 2021-12-29 | 2022-04-29 | 广东电网有限责任公司 | Method and device for calculating severity of turn-to-turn short circuit |
| CN115459353A (en) * | 2022-10-19 | 2022-12-09 | 中南大学 | Unified analysis method for contribution of short-circuit current in full-stage of double-fed wind power fault ride-through |
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