CN116203463A - Transformer fault detection method, device, computer equipment and storage medium - Google Patents
Transformer fault detection method, device, computer equipment and storage medium Download PDFInfo
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- CN116203463A CN116203463A CN202310456298.6A CN202310456298A CN116203463A CN 116203463 A CN116203463 A CN 116203463A CN 202310456298 A CN202310456298 A CN 202310456298A CN 116203463 A CN116203463 A CN 116203463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention relates to the field of transformers, and in particular, to a method and apparatus for detecting a transformer fault, a computer device, and a storage medium. The method comprises the following steps: calculating whether the ratio of the first turns to the second turns is equal to the ratio of the first negative sequence component current to the second negative sequence component current; if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And (3) with
Obtaining a target ratio; judging whether the target ratio is within a range of [0.1,3); if yes, obtaining the oil in the transformer oil in the first shell and the second shell
And (3) with
Obtaining a first ratio and a second ratio; and comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has short circuit fault according to the comparison result. The problem that whether the faults of the existing transformer are caused by winding short circuit or not is difficult to detect is solved.
Description
Technical Field
The present invention relates to the field of transformers, and in particular, to a method and apparatus for detecting a transformer fault, a computer device, and a storage medium.
Background
The transformer is a device for changing an ac voltage by using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil and an iron core. In electrical equipment and wireless circuits, it is often used as a step-up voltage, a matching impedance, a safety isolation, etc. In a generator, an electrical potential is induced in the coil, whether the coil is moved through a magnetic field or a magnetic field is moved through a stationary coil. In both cases, the value of the magnetic flux is unchanged, but the amount of the magnetic flux crossing the coil varies, which is the principle of mutual induction. A transformer is a device that converts voltage, current and impedance using electromagnetic mutual induction. The transformer may fail, but it is difficult to detect if a winding short circuit is causing.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a transformer fault detection method, a device, computer equipment and a storage medium, and aims to solve the problem that whether the faults of the existing transformer are winding short circuits or not are difficult to detect.
The technical scheme provided by the invention is as follows:
a method of transformer fault detection, the method comprising:
a first shell and a second shell are respectively sleeved on a low-voltage side winding and a high-voltage side winding of a first transformer, and a plurality of through holes are formed in the first shell and the second shell;
acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And->
Obtaining a target ratio;
judging whether the target ratio is within a range of [0.1,3);
if yes, obtaining the transformer oil in the first shell and the second shell
And->
Obtaining a first ratio and a second ratio;
and comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has short circuit fault according to a comparison result.
Preferably, the step of comparing the first ratio with the second ratio and determining that the low-voltage side winding or the high-voltage side winding has a short-circuit fault according to the comparison result includes:
if the first ratio is larger than the second ratio, judging that the low-voltage side winding has short circuit fault;
and if the first ratio is smaller than the second ratio, judging that the high-voltage side winding has short circuit fault.
Preferably, the step of comparing the first ratio with the second ratio and determining that the low-voltage side winding and the high-voltage side winding have a short-circuit fault according to the comparison result includes:
and if the first ratio is equal to the second ratio, judging that the low-voltage side winding and the high-voltage side winding have short circuit faults.
Preferably, after the step of comparing the magnitude of the first ratio with the magnitude of the second ratio and judging that the low-voltage side winding or/and the high-voltage side winding has a short-circuit fault according to the comparison result, the method comprises the following steps:
evacuating transformer oil in the first transformer;
reinjecting new transformer oil into the first transformer;
after a first preset time of operation of the first transformer, obtaining new transformer oil in the first shell and the second shell
And->
Obtaining a new first ratio and a new second ratio;
comparing the magnitude of the new first ratio with the magnitude of the new second ratio to obtain a new comparison result;
judging whether the new comparison result is consistent with the previous comparison result;
if yes, the result of judging that the short circuit fault occurs in the low-voltage side winding or/and the high-voltage side winding is kept.
Preferably, after the step of judging whether the new comparison result and the previous comparison result remain identical, it includes:
and if not, executing the step of acquiring the first current of the low-voltage side winding and the second current of the high-voltage side winding again and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current.
Preferably, after the step of determining that the short-circuit fault occurs in the low-voltage side winding if the first ratio is greater than the second ratio, the method includes:
obtaining the transformer oil in the first shell every second preset time
And->
Is a ratio of (2);
generating an early warning distribution diagram by the difference value of the current ratio and the last ratio;
judging whether a graph of the continuous three-time difference value in the early warning distribution graph is in an ascending trend or not;
if yes, sending out an early warning signal.
Preferably, after the step of generating the early warning distribution map by the difference between the current ratio and the last ratio, the method includes:
judging whether any difference value in the early warning distribution diagram is larger than a preset threshold value or not;
if yes, sending out an early warning signal.
The invention also provides a transformer fault detection device, which comprises:
the high-voltage side winding and the low-voltage side winding of the first transformer are respectively sleeved with a first shell and a second shell, and a plurality of through holes are formed in the first shell and the second shell;
a first acquisition module for acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
the processing module is used for acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
a calculation module for calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
a second acquisition module for acquiring the transformer oil in the first transformer and outside the first and second housings if not
And->
Obtaining a target ratio;
a judging module, configured to judge whether the target ratio is within a range of [0.1,3);
a third obtaining module, configured to obtain, if yes, oil in the first shell and oil in the transformer in the second shell
And->
Obtaining a first ratio and a second ratio;
and the fault judging module is used for comparing the first ratio with the second ratio and judging whether the low-voltage side winding or/and the high-voltage side winding have short circuit faults according to the comparison result.
The invention also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of any of the methods described above when the processor executes the computer program.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of the preceding claims.
According to the technical scheme, the invention has the beneficial effects that: the through hole of the first shell can enable transformer oil to flow in the first shell, the transformer oil near the low-voltage side winding can be slowed down to flow outwards in a certain extent by the first shell, the transformer oil can flow in the second shell by the through hole of the second shell, the transformer oil near the high-voltage side winding can be slowed down to flow outwards in a certain extent by the second shell, if the ratio of the first turns to the second turns is not equal to the ratio of the first negative sequence component current to the second negative sequence component current, and the target ratio is in a range, the winding of the first transformer can be judged to have a short circuit fault through double verification, and then whether the low-voltage side winding or the high-voltage side winding has a short circuit fault is judged according to the size of the first ratio and the second ratio, so that the problem that whether the fault of the existing transformer is the winding short circuit is difficult to detect is solved.
Drawings
FIG. 1 is a flow chart of transformer fault detection provided by an embodiment of the invention;
FIG. 2 is a functional block diagram of transformer fault detection provided by an embodiment of the present invention;
fig. 3 is a schematic block diagram of a computer device to which an embodiment of the present invention is applied.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting a transformer fault, where the method includes:
step S101, a first shell and a second shell are respectively sleeved on a low-voltage side winding and a high-voltage side winding of a first transformer, and a plurality of through holes are formed in the first shell and the second shell.
The low-voltage side winding is provided with the first shell, and the first shell is provided with a plurality of through holes, so that transformer oil can flow into the low-voltage side winding in the first shell, and the transformer oil flowing away of a low-voltage side winding accessory is slowed down to a certain extent.
The second shell is arranged on the high-voltage side winding, and the second shell is provided with a plurality of through holes, so that transformer oil can flow into the high-voltage side winding in the second shell, and the transformer oil flowing away of the high-voltage side winding accessories is slowed down to a certain extent.
Step S102, obtaining a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding.
The model of the first transformer is obtained, and the number of turns of the low-voltage side winding and the number of turns of the high-voltage side winding corresponding to the model of the first transformer can be known according to production information of manufacturers, so that the first number of turns and the second number of turns are obtained.
Step S103, obtaining a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current.
The current of the low-voltage side winding is detected, and then the current is converted into a negative sequence component current to obtain a first negative sequence component current, specifically, discrete fourier transform and fortiscue transform are performed to extract a negative sequence component. And similarly, detecting the current of the high-voltage side winding, and converting the current into a negative sequence component current to obtain a first negative sequence component current.
Step S104, calculating whether the ratio of the first turns to the second turns is equal to the ratio of the first negative sequence component current to the second negative sequence component current.
The ratio of the first turns to the second turns is calculated, then the ratio of the first negative sequence component current to the second negative sequence component current is calculated, whether the ratio of the first negative sequence component current to the second negative sequence component current is equal or not is judged, and if the ratio of the first negative sequence component current to the second negative sequence component current is unequal, turn-to-turn short circuit fault of the low-voltage side winding or/and the high-voltage side winding of the first transformer is indicated.
Step S105, if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And->
To obtain a target ratio.
To further verify that the above-mentioned turn-to-turn short circuit fault is correct, the transformer oil in the first transformer and not in the first and second casings is obtained
And->
And obtaining a target ratio, and verifying whether the turn-to-turn short circuit fault is correct or not according to the fact that whether the target ratio is within a range of [0.1,3 ].
Step S106, judging whether the target ratio is in the range of [0.1,3 ].
And if the target ratio is within [0.1,3), executing the next step, otherwise, executing the step S103 again, and if the target ratio is not within [0.1,3) in the step S106, the actual number of turns of the low-voltage side winding and the actual number of turns of the high-voltage side winding are inconsistent with the obtained number of turns of the low-voltage side winding and the obtained number of turns of the high-voltage side winding, and sending an alarm signal.
Step S107, if yes, obtaining transformer oil in the first shell and the second shell
And (3) with
A first ratio and a second ratio are obtained.
Due to a certain delay in the flow of transformer oil in the first and second housing, if a short-circuit fault occurs in the low-side winding or/and the high-side winding, the transformer oil in the first and/or second housing
And->
Ratio of (2) to the first housing or and +.>
And->
The ratio of (2) is not the same.
And S108, comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has a short circuit fault according to a comparison result.
And judging whether the low-voltage side winding or the high-voltage side winding has short circuit faults according to the first ratio and the second ratio.
The through hole of the first shell can enable transformer oil to flow in the first shell, the transformer oil near the low-voltage side winding can be slowed down to flow outwards in a certain extent by the first shell, the transformer oil can flow in the second shell by the through hole of the second shell, the transformer oil near the high-voltage side winding can be slowed down to flow outwards in a certain extent by the second shell, if the ratio of the first turns to the second turns is not equal to the ratio of the first negative sequence component current to the second negative sequence component current, and the target ratio is in a range, the winding of the first transformer can be judged to have a short circuit fault through double verification, and then whether the low-voltage side winding or the high-voltage side winding has a short circuit fault is judged according to the size of the first ratio and the second ratio, so that the problem that whether the fault of the existing transformer is the winding short circuit is difficult to detect is solved.
In some embodiments, a first opening and closing mechanism is further provided in the first housing, by which the through hole in the first housing is opened or closed. The second housing is also provided with a second opening and closing mechanism by which the through hole in the second housing is opened or closed. The through holes of the first shell and the second shell are in an open state most of the time, and the transformer oil in the first shell and the transformer oil in the second shell are required to be obtained
And->
The through holes of the first housing and the second housing are closed by the first opening and closing mechanism and the second opening and closing mechanism.
In the present embodiment, in step S108, it includes:
if the first ratio is larger than the second ratio, judging that the low-voltage side winding has short circuit fault;
and if the first ratio is smaller than the second ratio, judging that the high-voltage side winding has short circuit fault.
The first ratio is compared with the second ratio, and if the first ratio is large, the short-circuit fault is considered to occur in the low-voltage side winding, and otherwise, the short-circuit fault is considered to occur in the high-voltage side winding.
In the present embodiment, in step S108, it includes:
and if the first ratio is equal to the second ratio, judging that the low-voltage side winding and the high-voltage side winding have short circuit faults.
If the first ratio is equal to the second ratio, then both the low side winding and the high side winding are considered to have a short circuit fault.
In the present embodiment, after step S108, it includes:
evacuating transformer oil in the first transformer;
reinjecting new transformer oil into the first transformer;
after a first preset time of operation of the first transformer, obtaining new transformer oil in the first shell and the second shell
And->
Obtaining a new first ratio and a new second ratio;
comparing the magnitude of the new first ratio with the magnitude of the new second ratio to obtain a new comparison result;
judging whether the new comparison result is consistent with the previous comparison result;
if yes, the result of judging that the short circuit fault occurs in the low-voltage side winding or/and the high-voltage side winding is kept.
In order to avoid the problem of transformer oil, the transformer oil in the first transformer is emptied, including the transformer oil in the first shell and the transformer oil in the second shell are also emptied, new transformer oil is injected into the first transformer again, a new comparison result is obtained according to the comparison of the new first ratio and the new second ratio, the new comparison result is consistent with the previous comparison result, and then the result of short circuit fault is judged before being maintained. For example, a new comparison result is that the new first ratio is greater than the new second ratio, and a previous comparison result is that the first ratio is greater than the second ratio, then it is considered to be consistent.
In this embodiment, after the step of determining whether the new comparison result and the previous comparison result remain identical, it includes:
and if not, executing the step of acquiring the first current of the low-voltage side winding and the second current of the high-voltage side winding again and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current.
If the new comparison result is not consistent with the previous comparison result, the steps of taking the first current of the low-side winding and the second current of the high-side winding, and converting into the first negative sequence component current and the second negative sequence component current need to be performed again.
In this embodiment, after the step of determining that the short-circuit fault occurs in the low-voltage side winding if the first ratio is greater than the second ratio, the method includes:
obtaining the transformer oil in the first shell every second preset time
And->
Is a ratio of (2);
generating an early warning distribution diagram by the difference value of the current ratio and the last ratio;
judging whether a graph of the continuous three-time difference value in the early warning distribution graph is in an ascending trend or not;
if yes, sending out an early warning signal.
Recording the difference value of the ratio of each time and the ratio of the last time, generating an early warning distribution diagram according to the difference value, and if the difference value is increased three times, indicating that the short circuit fault of the low-voltage side winding is more and more serious, and sending an early warning signal.
In this embodiment, after the step of generating the early warning distribution map from the difference between the current ratio and the last ratio, the method includes:
judging whether any difference value in the early warning distribution diagram is larger than a preset threshold value or not;
if yes, sending out an early warning signal.
And comparing the difference value of each time with a preset threshold value, if the difference value is larger than the preset threshold value, indicating that the short-circuit fault of the low-voltage side winding is serious, and sending out an early warning signal.
As shown in fig. 2, an embodiment of the present invention proposes a transformer fault detection device 1, where the device 1 includes a housing module 11, a first obtaining module 12, a processing module 13, a calculating module 14, a second obtaining module 15, a judging module 16, a third obtaining module 17, and a fault judging module 18.
The sleeving module 11 is used for sleeving a first shell and a second shell on a low-voltage side winding and a high-voltage side winding of the first transformer respectively, and the first shell and the second shell are provided with a plurality of through holes.
The low-voltage side winding is provided with the first shell, and the first shell is provided with a plurality of through holes, so that transformer oil can flow into the low-voltage side winding in the first shell, and the transformer oil flowing away of a low-voltage side winding accessory is slowed down to a certain extent.
The second shell is arranged on the high-voltage side winding, and the second shell is provided with a plurality of through holes, so that transformer oil can flow into the high-voltage side winding in the second shell, and the transformer oil flowing away of the high-voltage side winding accessories is slowed down to a certain extent.
A first acquisition module 12 for acquiring a first number of turns of the low-side winding and a second number of turns of the high-side winding.
The model of the first transformer is obtained, and the number of turns of the low-voltage side winding and the number of turns of the high-voltage side winding corresponding to the model of the first transformer can be known according to production information of manufacturers, so that the first number of turns and the second number of turns are obtained.
The processing module 13 is configured to obtain a first current of the low-voltage side winding and a second current of the high-voltage side winding, and convert the first current and the second current into a first negative sequence component current and a second negative sequence component current.
The current of the low-voltage side winding is detected, and then the current is converted into a negative sequence component current to obtain a first negative sequence component current, specifically, discrete fourier transform and fortiscue transform are performed to extract a negative sequence component. And similarly, detecting the current of the high-voltage side winding, and converting the current into a negative sequence component current to obtain a first negative sequence component current.
A calculating module 14, configured to calculate whether the ratio of the first number of turns to the second number of turns is equal to the ratio of the first negative sequence component current to the second negative sequence component current.
The ratio of the first turns to the second turns is calculated, then the ratio of the first negative sequence component current to the second negative sequence component current is calculated, whether the ratio of the first negative sequence component current to the second negative sequence component current is equal or not is judged, and if the ratio of the first negative sequence component current to the second negative sequence component current is unequal, turn-to-turn short circuit fault of the low-voltage side winding or/and the high-voltage side winding of the first transformer is indicated.
A second obtaining module 15 for obtaining transformer oil in the first transformer and outside the first and second casings if not
And->
To obtain a target ratio.
To further verify that the above-mentioned turn-to-turn short circuit fault is correct, the transformer oil in the first transformer and not in the first and second casings is obtained
And->
And obtaining a target ratio, and verifying whether the turn-to-turn short circuit fault is correct or not according to the fact that whether the target ratio is within a range of [0.1,3 ].
A determination module 16 for determining whether the target ratio is within [0.1,3).
And if the target ratio is within [0.1,3), executing the next step, otherwise, executing the step S103 again, and if the target ratio is not within [0.1,3) in the step S106, the actual number of turns of the low-voltage side winding and the actual number of turns of the high-voltage side winding are inconsistent with the obtained number of turns of the low-voltage side winding and the obtained number of turns of the high-voltage side winding, and sending an alarm signal.
A third obtaining module 17, configured to obtain, if yes, the transformer oil in the first housing and the second housing
And->
A first ratio and a second ratio are obtained.
Due to a certain delay in the flow of transformer oil in the first and second housing, if a short-circuit fault occurs in the low-side winding or/and the high-side winding, the transformer oil in the first and/or second housing
And->
Ratio of (2) to the first housing or and +.>
And->
The ratio of (2) is not the same.
The fault judging module 18 is configured to compare the first ratio with the second ratio, and judge that a short circuit fault occurs in the low-voltage side winding or/and the high-voltage side winding according to a comparison result.
And judging whether the low-voltage side winding or the high-voltage side winding has short circuit faults according to the first ratio and the second ratio.
The through hole of the first shell can enable transformer oil to flow in the first shell, the transformer oil near the low-voltage side winding can be slowed down to flow outwards in a certain extent by the first shell, the transformer oil can flow in the second shell by the through hole of the second shell, the transformer oil near the high-voltage side winding can be slowed down to flow outwards in a certain extent by the second shell, if the ratio of the first turns to the second turns is not equal to the ratio of the first negative sequence component current to the second negative sequence component current, and the target ratio is in a range, the winding of the first transformer can be judged to have a short circuit fault through double verification, and then whether the low-voltage side winding or the high-voltage side winding has a short circuit fault is judged according to the size of the first ratio and the second ratio, so that the problem that whether the fault of the existing transformer is the winding short circuit is difficult to detect is solved.
In some embodiments, a first opening and closing mechanism is further provided in the first housing, by which the through hole in the first housing is opened or closed. The second housing is also provided with a second opening and closing mechanism by which the through hole in the second housing is opened or closed. The through holes of the first shell and the second shell are in an open state most of the time, and the transformer oil in the first shell and the transformer oil in the second shell are required to be obtained
And->
The through holes of the first housing and the second housing are closed by the first opening and closing mechanism and the second opening and closing mechanism.
In the present embodiment, the failure determination module 18 includes:
the first sub-judging module is used for judging that the low-voltage side winding has short-circuit faults if the first ratio is larger than the second ratio;
and the second sub-judging module is used for judging that the high-voltage side winding has short circuit fault if the first ratio is smaller than the second ratio.
The first ratio is compared with the second ratio, and if the first ratio is large, the short-circuit fault is considered to occur in the low-voltage side winding, and otherwise, the short-circuit fault is considered to occur in the high-voltage side winding.
In the present embodiment, the failure determination module 18 includes:
and the third sub-judging module is used for judging that the short-circuit fault occurs between the low-voltage side winding and the high-voltage side winding if the first ratio is equal to the second ratio.
If the first ratio is equal to the second ratio, then both the low side winding and the high side winding are considered to have a short circuit fault.
In this embodiment, the apparatus 1 includes:
the emptying module is used for emptying the transformer oil in the first transformer;
the injection module is used for reinjecting new transformer oil into the first transformer;
a fourth obtaining module for obtaining new transformer oil in the first shell and the second shell after the first transformer operates for a first preset time
And->
Obtaining a new first ratio and a new second ratio;
the comparison module is used for comparing the new first ratio with the new second ratio to obtain a new comparison result;
the first judging module is used for judging whether the new comparison result is consistent with the previous comparison result or not;
and the result identification module is used for maintaining the previous result of judging that the low-voltage side winding or/and the high-voltage side winding has a short circuit fault if the result is yes.
In order to avoid the problem of transformer oil, the transformer oil in the first transformer is emptied, including the transformer oil in the first shell and the transformer oil in the second shell are also emptied, new transformer oil is injected into the first transformer again, a new comparison result is obtained according to the comparison of the new first ratio and the new second ratio, the new comparison result is consistent with the previous comparison result, and then the result of short circuit fault is judged before being maintained. For example, a new comparison result is that the new first ratio is greater than the new second ratio, and a previous comparison result is that the first ratio is greater than the second ratio, then it is considered to be consistent.
In this embodiment, the apparatus 1 includes:
and the repeated execution module is used for executing the steps of acquiring the first current of the low-voltage side winding and the second current of the high-voltage side winding again and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current if not.
If the new comparison result is not consistent with the previous comparison result, the steps of taking the first current of the low-side winding and the second current of the high-side winding, and converting into the first negative sequence component current and the second negative sequence component current need to be performed again.
In this embodiment, the apparatus 1 includes:
a fifth obtaining module, configured to obtain the transformer oil in the first housing at intervals of a second preset time
And->
Is a ratio of (2);
the generation module is used for generating an early warning distribution diagram from the difference value of the current ratio and the last ratio;
the second judging module is used for judging whether the graph of the continuous three-time difference value in the early warning distribution graph is in an ascending trend or not;
and the first early warning module is used for sending out early warning signals if yes.
Recording the difference value of the ratio of each time and the ratio of the last time, generating an early warning distribution diagram according to the difference value, and if the difference value is increased three times, indicating that the short circuit fault of the low-voltage side winding is more and more serious, and sending an early warning signal.
In this embodiment, the apparatus 1 includes:
the third judging module is used for judging whether any difference value in the early warning distribution diagram is larger than a preset threshold value or not;
and the second early warning module is used for sending out an early warning signal if the first early warning module is used for sending out the early warning signal.
And comparing the difference value of each time with a preset threshold value, if the difference value is larger than the preset threshold value, indicating that the short-circuit fault of the low-voltage side winding is serious, and sending out an early warning signal.
As shown in fig. 3, in an embodiment of the present invention, a computer device is further provided, where the computer device may be a server, and the internal structure of the computer device may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the computer is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data such as a model of the transformer fault detection method. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a transformer fault detection method.
The processor executes the steps of the transformer fault detection method: a first shell and a second shell are respectively sleeved on a low-voltage side winding and a high-voltage side winding of a first transformer, and a plurality of through holes are formed in the first shell and the second shell;
acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And->
Obtaining a target ratio;
judging whether the target ratio is within a range of [0.1,3);
if yes, obtaining the transformer oil in the first shell and the second shell
And->
Obtaining a first ratio and a second ratio;
and comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has short circuit fault according to a comparison result.
It will be appreciated by those skilled in the art that the architecture shown in fig. 3 is merely a block diagram of a portion of the architecture in connection with the present inventive arrangements and is not intended to limit the computer devices to which the present inventive arrangements are applicable.
According to the computer equipment provided by the embodiment of the invention, the through hole of the first shell can enable transformer oil to flow in the first shell, the first shell also slows down the outward flow of transformer oil near the low-voltage side winding to a certain extent, and similarly, the through hole of the second shell can enable transformer oil to flow in the second shell, the second shell also slows down the outward flow of transformer oil near the high-voltage side winding to a certain extent, if the ratio of the first turns to the second turns is not equal to the ratio of the first negative sequence component current to the second negative sequence component current, and the target ratio is within a range, the short circuit fault of the winding of the first transformer can be known through double verification, and then whether the short circuit fault of the low-voltage side winding or the high-voltage side winding occurs is judged according to the size of the first ratio and the second ratio, so that the problem that whether the short circuit fault of the existing transformer is caused by the winding is difficult to detect is solved.
An embodiment of the present invention further provides a computer readable storage medium having a computer program stored thereon, where the computer program when executed by a processor implements a method for detecting a transformer fault, specifically: a first shell and a second shell are respectively sleeved on a low-voltage side winding and a high-voltage side winding of a first transformer, and a plurality of through holes are formed in the first shell and the second shell;
acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And->
Obtaining a target ratio;
judging whether the target ratio is within a range of [0.1,3);
if yes, obtaining the transformer oil in the first shell and the second shell
And->
Obtaining a first ratio and a second ratio;
and comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has short circuit fault according to a comparison result.
According to the storage medium provided by the embodiment of the invention, the through hole of the first shell can enable the transformer oil to flow in the first shell, the transformer oil near the low-voltage side winding can be slowed down to flow outwards in a certain extent by the first shell, the transformer oil near the high-voltage side winding can be slowed down to flow outwards in a certain extent by the through hole of the second shell, if the ratio of the first turns to the second turns is not equal to the ratio of the first negative sequence component current to the second negative sequence component current, and the target ratio is within a range, the short circuit fault of the winding of the first transformer can be known through double verification, and then whether the short circuit fault occurs in the low-voltage side winding or the high-voltage side winding is judged according to the size of the first ratio and the second ratio, so that the problem that whether the short circuit fault of the existing transformer is caused by the winding is difficult to detect is solved.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided by the present invention and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A method for detecting a transformer fault, the method comprising:
a first shell and a second shell are respectively sleeved on a low-voltage side winding and a high-voltage side winding of a first transformer, and a plurality of through holes are formed in the first shell and the second shell;
acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
if not, obtaining transformer oil in the first transformer and outside the first shell and the second shell
And->
Obtaining a target ratio;
judging whether the target ratio is within a range of [0.1,3);
if yes, obtaining the transformer oil in the first shell and the second shell
And->
Obtaining a first ratio and a second ratio;
and comparing the first ratio with the second ratio, and judging that the low-voltage side winding or/and the high-voltage side winding has short circuit fault according to a comparison result.
2. The transformer fault detection method according to claim 1, wherein the step of comparing the magnitudes of the first ratio and the second ratio and judging that the short-circuit fault occurs in the low-voltage side winding or the high-voltage side winding according to the comparison result comprises:
if the first ratio is larger than the second ratio, judging that the low-voltage side winding has short circuit fault;
and if the first ratio is smaller than the second ratio, judging that the high-voltage side winding has short circuit fault.
3. The method according to claim 1, wherein the step of comparing the magnitudes of the first ratio and the second ratio and judging that the short-circuit fault occurs between the low-voltage side winding and the high-voltage side winding according to the comparison result comprises:
and if the first ratio is equal to the second ratio, judging that the low-voltage side winding and the high-voltage side winding have short circuit faults.
4. The transformer fault detection method according to claim 1, wherein after the step of comparing the magnitudes of the first ratio and the second ratio and judging that the low-voltage side winding or/and the high-voltage side winding has a short-circuit fault according to the comparison result, comprising:
evacuating transformer oil in the first transformer;
reinjecting new transformer oil into the first transformer;
after a first preset time of operation of the first transformer, obtaining new transformer oil in the first shell and the second shell
And->
Obtaining a new first ratio and a new second ratio;
comparing the magnitude of the new first ratio with the magnitude of the new second ratio to obtain a new comparison result;
judging whether the new comparison result is consistent with the previous comparison result;
if yes, the result of judging that the short circuit fault occurs in the low-voltage side winding or/and the high-voltage side winding is kept.
5. The transformer fault detection method according to claim 4, wherein after the step of judging whether the new comparison result is consistent with the previous comparison result, comprising:
and if not, executing the step of acquiring the first current of the low-voltage side winding and the second current of the high-voltage side winding again and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current.
6. The transformer fault detection method according to claim 2, wherein after the step of determining that the low-side winding has a short-circuit fault if the first ratio is greater than the second ratio, comprising:
obtaining the transformer oil in the first shell every second preset time
And->
Is a ratio of (2);
generating an early warning distribution diagram by the difference value of the current ratio and the last ratio;
judging whether a graph of the continuous three-time difference value in the early warning distribution graph is in an ascending trend or not;
if yes, sending out an early warning signal.
7. The transformer fault detection method according to claim 6, wherein after the step of generating the early warning profile from the difference between the current ratio and the last ratio, the method comprises:
judging whether any difference value in the early warning distribution diagram is larger than a preset threshold value or not;
if yes, sending out an early warning signal.
8. A transformer fault detection device, the device comprising:
the high-voltage side winding and the low-voltage side winding of the first transformer are respectively sleeved with a first shell and a second shell, and a plurality of through holes are formed in the first shell and the second shell;
a first acquisition module for acquiring a first number of turns of the low-voltage side winding and a second number of turns of the high-voltage side winding;
the processing module is used for acquiring a first current of the low-voltage side winding and a second current of the high-voltage side winding, and converting the first current and the second current into a first negative sequence component current and a second negative sequence component current;
a calculation module for calculating whether a ratio of the first number of turns to the second number of turns is equal to a ratio of the first negative sequence component current to the second negative sequence component current;
a second acquisition module for acquiring the transformer oil in the first transformer and outside the first and second housings if not
And->
Obtaining a target ratio;
a judging module, configured to judge whether the target ratio is within a range of [0.1,3);
a third obtaining module, configured to obtain, if yes, oil in the first shell and oil in the transformer in the second shell
And->
Obtaining a first ratio and a second ratio;
and the fault judging module is used for comparing the first ratio with the second ratio and judging whether the low-voltage side winding or/and the high-voltage side winding have short circuit faults according to the comparison result.
9. A computer 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 to 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 of any of claims 1 to 7.
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