CN114755611B - Acoustic wave-based method and device for detecting turn-to-turn short circuit of oil paper insulation transformer - Google Patents
Acoustic wave-based method and device for detecting turn-to-turn short circuit of oil paper insulation transformer Download PDFInfo
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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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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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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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- 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
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- 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
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Abstract
The invention discloses a sound wave-based method and a sound wave-based device for detecting turn-to-turn short circuit of an oil paper insulation transformer, wherein a sound wave transmitting device is arranged on one side of a winding of the transformer, and a sound wave receiving device is arranged on the other side of the winding; determining the wire diameter of a low-voltage side winding of the transformer, the wire diameter of a high-voltage side winding of the transformer and the height of the winding; configuring an acoustic wave emission mode; transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode; receiving acoustic signals of a second duration with the acoustic receiving devices of the group; filtering peak signals in a target peak range in the sound wave signals to obtain signals to be detected; and under the condition that the preset threshold value is exceeded, judging that the winding has an inter-turn short circuit. According to the method, sound wave transmission is performed in the corresponding mode, and the detection signal is received at the receiving end, so that whether turn-to-turn short circuits exist in each winding of the transformer can be judged.
Description
Technical Field
The invention relates to the technical field of transformer fault detection, in particular to a method and a device for detecting turn-to-turn short circuit of an oil paper insulation transformer based on sound waves.
Background
With the rapid development of national economy, the power grid scale is rapidly enlarged, and the power transformation equipment is used as a core and a hub for energy transmission in the power grid, so that continuous, stable and reliable operation of the power transformation equipment is required to be ensured so as to prevent major faults of the power grid. The oil immersed transformer in the power transformation equipment is the core of a transformer substation, and carries high-capacity electric energy conversion and transmission, and safe and reliable operation is the basis of normal and stable operation of a power grid, and once the oil immersed transformer breaks down, the power grid in the whole area is paralyzed, and the power supply reliability and the safety are seriously jeopardized.
In the prior art, the basic configuration of a transformer relay protection device is current quick-break protection and overcurrent protection. However, after the current protection operation, it can only be determined that the transformer has failed. However, without disassembling the transformer, it is impossible to determine whether an inter-turn short circuit has occurred or not, and it is further impossible to determine the specific location of the inter-turn short circuit fault.
Disclosure of Invention
The embodiment of the invention provides a sound wave-based method and a sound wave-based device for detecting inter-turn short circuits of an oil paper insulating transformer, which can judge inter-turn short circuit faults without disassembling an oil immersed transformer, and can judge specific positions of the inter-turn faults in some examples.
The embodiment of the invention provides an acoustic wave-based method for detecting turn-to-turn short circuit of an oil paper insulation transformer, wherein the transformer comprises a plurality of windings and comprises the following steps:
a sound wave transmitting device is arranged on one side of the winding of the transformer, a sound wave receiving device is arranged on the other side of the winding, a sound wave detection passage covering the winding is formed based on a group of sound wave transmitting devices and sound wave receiving devices, and a set included angle is formed between the sound wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding based on the winding transformation ratio and the transformer capacity of the transformer, and determining the environmental temperature of the current test environment;
configuring sound wave emission modes, wherein different sound wave emission modes have corresponding sound wave emission parameters, and the sound wave emission parameters of different wire diameters, different winding heights and different environment temperatures are different, so that sound wave signals received by a sound wave receiving device have similar signal peaks after passing through a similar sound wave detection passage under the condition of no faults;
transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode;
receiving acoustic signals of a second duration by using the acoustic receiving devices of the group, wherein the second duration is longer than the first duration;
filtering peak signals in a target peak range in the sound wave signals to obtain signals to be detected;
judging whether the peak value of the signal to be detected exceeds a preset threshold value, and judging that the winding has inter-turn short circuit under the condition that the peak value exceeds the preset threshold value.
In some embodiments, the comparison is made based on acoustic signals received at each winding, or the comparison is made based on acoustic signals received at a plurality of positions of the winding, respectively, to determine a fault-free acoustic detection path, an
The target peak range is determined with the acoustic wave signal received by the fault-free acoustic wave detection path as a background signal.
In some embodiments, transmitting the acoustic wave for the first predetermined duration to the winding with the acoustic wave transmitting device is concurrent with receiving the acoustic wave signal for the second duration with the acoustic wave receiving device of the group;
the method for detecting and positioning the turn-to-turn short circuit of the transformer further comprises the following steps:
and determining the propagation speed of the sound wave signal in the winding based on the starting position of the sound wave signal received by the fault-free sound wave detection path in the time axis corresponding to the second time length.
In some embodiments, in the case that it is determined that the winding has an inter-turn short circuit, the method for detecting and positioning an inter-turn short circuit of the transformer further includes: and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration.
In some embodiments, in an initial case, the acoustic wave detection path is perpendicular to a winding direction of the transformer, and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration includes:
determining a difference value between the starting time of the second duration and the starting time of the signal to be detected;
the location of the turn-to-turn short circuit is determined based on the product of the difference and the determined propagation velocity of the acoustic wave signal in the winding.
In some embodiments, after determining the location of the inter-turn short, the transformer inter-turn short detection positioning method further comprises:
changing the receiving angle of the sound wave receiving device according to a preset angle interval, and repeatedly receiving sound wave signals;
and determining the degree of the turn-to-turn short circuit based on the sound wave signal received by the sound wave receiving device after the receiving angle is changed.
In some embodiments, determining the degree of the turn-to-turn short circuit based on the acoustic wave signal received by the acoustic wave receiving device after the change in the receiving angle includes:
when the condition that the signal to be detected corresponding to the turn-to-turn short circuit cannot be received is determined, the angle change amount of the sound wave receiving device based on the initial state;
and determining the width of the turn-to-turn short circuit fault according to the distance between the determined turn-to-turn short circuit position and the acoustic wave receiving device in the initial state, the angle change amount of the acoustic wave receiving device and the moving amount of the acoustic wave receiving device.
The embodiment of the invention provides an acoustic wave-based turn-to-turn short circuit detection device of an oilpaper insulation transformer, wherein the transformer comprises a plurality of windings, a controller, an acoustic wave transmitting device and an acoustic wave receiving device, and the device comprises the following components:
a sound wave transmitting device is arranged on one side of the winding of the transformer, a sound wave receiving device is arranged on the other side of the winding, a sound wave detection passage covering the winding is formed based on a group of sound wave transmitting devices and sound wave receiving devices, and a set included angle is formed between the sound wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding based on the winding transformation ratio and the transformer capacity of the transformer, and determining the environmental temperature of the current test environment;
the controller is utilized to configure sound wave emission modes, different sound wave emission modes have corresponding sound wave emission parameters, wherein the sound wave emission parameters of different wire diameters, different winding heights and different environment temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peaks after passing through a similar sound wave detection passage under the condition of no faults; the method comprises the steps of,
transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode;
receiving acoustic signals of a second duration by using the acoustic receiving devices of the group, wherein the second duration is longer than the first duration;
filtering peak signals in a target peak range in the sound wave signals by using the controller to obtain signals to be detected;
judging whether the peak value of the signal to be detected exceeds a preset threshold value, and judging that the winding has inter-turn short circuit under the condition that the peak value exceeds the preset threshold value.
The embodiment of the invention provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the sound wave-based turn-to-turn short circuit detection method of the oil paper insulation transformer in the embodiments of the application when being executed by a processor.
The embodiment of the invention utilizes the configuration of the sound wave emission mode, executes sound wave emission in the corresponding mode, and receives the detection signal at the receiving end, thereby judging whether each winding of the transformer has the turn-to-turn short circuit or not, and in some examples, judging the specific position of the turn-to-turn short circuit.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a basic flowchart of a method for detecting and positioning an inter-turn short circuit of an oil immersed transformer according to this embodiment.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The embodiment of the invention provides an oil paper insulation transformer turn-to-turn short circuit detection method based on sound waves. As shown in fig. 1, the method for detecting and positioning the turn-to-turn short circuit of the transformer comprises the following steps:
in step S101, an acoustic wave transmitting device is disposed on one side of the winding of the transformer, and an acoustic wave receiving device is disposed on the other side of the winding, and an acoustic wave detection path covering the winding is formed based on a set of acoustic wave transmitting devices and acoustic wave receiving devices, and the acoustic wave detection path has a set included angle with the winding direction of the transformer. The specific sound wave transmitting device and the sound wave receiving device which form the sound wave detection path can be opposite, so that the sound wave receiving device can be ensured to correctly receive the sound wave signals. The acoustic wave transmitting device and the acoustic wave receiving device can be arranged before the transformer is put into operation. For the transformer windings of the oil immersed transformer, no air gap exists between the transformer windings, the windings of the windings are tightly arranged after the insulating paper is coated, in the example, the whole winding is considered, an acoustic wave transmitting device is arranged on one side of the winding, and an acoustic wave receiving device is arranged on the other side of the winding, so that the signal peak value of the fault signal can be improved.
In step S102, the wire diameter of the low-voltage side winding and the wire diameter of the high-voltage side winding of the transformer and the height of the winding are determined based on the winding transformation ratio of the transformer and the transformer capacity, and the ambient temperature of the current test environment is determined. The winding transformation ratio and the transformer capacity of the specific transformer can be obtained by inquiring a transformer nameplate, and can be tested in advance according to the transformation ratio and the capacity of the transformer, and a relation table is prepared, so that the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding under the conventional copper material are determined. In the example, the influence of the ambient temperature on the propagation speed of the sound wave in the conductor is further considered, so that the accuracy of positioning the turn-to-turn short circuit fault position can be further ensured.
In step S103, the acoustic wave transmitting modes are configured, and the different acoustic wave transmitting modes have corresponding acoustic wave transmitting parameters, wherein the acoustic wave transmitting parameters of different wire diameters, different winding heights and different ambient temperatures are different, so that the acoustic wave signals received by the acoustic wave receiving device have similar signal peaks after passing through a similar acoustic wave detection path without faults. In this example, the acoustic wave may be a conventional acoustic wave, the ultrasonic wave and the like may be specifically determined according to actual needs, and specific acoustic wave emission parameters may be obtained in advance by testing in an experimental environment, where in general, the winding wire of the low-voltage side transformer is thicker than the high-voltage side winding, and the wire of the high-voltage side winding is longer than the low-voltage side winding. The sound wave signal after configuration can be attenuated to a set amplitude interval under the condition of passing through a fault-free sound wave detection path. Specifically, a plurality of acoustic wave detection paths may be provided on the same item, for example, a plurality of acoustic wave transmitting devices and acoustic wave receiving devices may be arranged on the same item of winding at specified distance intervals, so that the whole winding can be covered, and a plurality of acoustic wave signals can be received based on the item of winding. The set amplitude interval in this embodiment may be a narrow-range amplitude interval, and setting the narrow-range amplitude interval may only pay attention to the detected signal from the acoustic wave detection path during the signal processing, shield the acoustic wave signal possibly from the conductor propagation, and facilitate the subsequent signal processing. The method can obtain the sound wave configuration modes under various voltage levels after a small number of tests, thereby applying the method to various scenes to execute the test of turn-to-turn short circuit faults. And the complexity of the process of performing signal processing in the later stage can be greatly reduced by configuring the acoustic wave emission mode, without considering errors caused by factors such as ambient temperature and the like.
In step S104, based on the configured acoustic wave emission mode, an acoustic wave with a first preset duration is emitted to the winding by using the acoustic wave emission device, and at the same time, an acoustic wave signal with a second duration is received by using the acoustic wave receiving devices of the group, where the second duration is longer than the first duration. Specifically, an acoustic wave transmitting device is used for transmitting acoustic waves of a first preset duration to an acoustic wave detection path of the winding. The testing mode of utilizing the sound wave can be even in the transformer operation process, according to appointed time interval to the transformer transmission sound wave signal to accomplish the detection, thereby realize electrified online operation monitoring. In this example, the manner of transmitting the sound wave of the first preset duration is not limited, for example, the first preset duration may be divided into a plurality of sub-time periods, and a small-section sound wave signal is transmitted in each sub-time period. The present example refers to an acoustic wave receiving device that turns on the acoustic wave detection path at the same time to receive an acoustic wave signal. In subsequent signal processing, specific positioning of the turn-to-turn short circuit fault can be achieved according to the moment when the acoustic wave signal starts to be received.
In step S105, peak signals within the target peak range in the acoustic wave signal are filtered to obtain a signal to be detected. In this example, two peak ranges may be designed, including a first target peak range and a second target peak range, for filtering out the acoustic wave peak signal from the conductor transmission and the acoustic wave peak signal from the acoustic wave detection path, respectively, and due to the presence of oiled paper, two different attenuations may exist compared to the case of propagation in the conductor only, especially for the case of a short length of the low-side winding wire, the attenuation from the conductor may be lower than the attenuation from the acoustic wave detection path. In this example, after filtering out the peak signal in the target peak range in the acoustic signal, a possible fault signal may be obtained. The acoustic wave signal passes through the fault location where the inter-turn short circuit fault exists, and as the conductor is in contact with the conductor and other turns have oilpaper insulation, diffraction effects occur at the fault location, and in this example, the signal within the target peak range is filtered, so that the signal to be detected can be determined.
In step S106, it is determined whether the peak value of the signal to be detected exceeds a preset threshold value, and if the peak value exceeds the preset threshold value, it is determined that an inter-turn short circuit exists in the winding. The specific range of the preset threshold may be determined in a retest environment in this example. And if the signal peak value of the signal to be detected exceeds a preset threshold value, judging that the turn-to-turn short circuit fault exists in the acoustic wave detection path of the winding.
The embodiment of the invention utilizes the configuration of the sound wave emission mode, executes sound wave emission in the corresponding mode, and receives the detection signal at the receiving end, thereby judging whether each winding of the oil-immersed transformer has turn-to-turn short circuit or not. In some examples, the specific location of the turn-to-turn short may also be determined, thereby guiding maintenance work on the transformer.
In some embodiments, the comparison is made based on acoustic signals received at each winding, or the comparison is made based on acoustic signals received at a plurality of positions of the winding, respectively, to determine a fault-free acoustic detection path, an
The target peak range is determined with the acoustic wave signal received by the fault-free acoustic wave detection path as a background signal.
In particular, for the first target peak range, it may be obtained in such a manner that, in the case where all the acoustic wave detection paths of the item winding determine that the item winding has no fault, the first target peak range is determined based on the acoustic wave signal received in the second time period range, and the first target peak range may be applied to a corresponding side, such as a low-voltage side winding or a high-voltage side winding.
For the second target peak range, it may be obtained in such a manner that, in the case where the plurality of acoustic wave detection paths of the winding perform pair analysis to determine that there is no fault, the second target peak range may be determined with the acoustic wave signal received by the fault-free acoustic wave detection path as a background signal. The determined second target peak range may likewise be applied to a corresponding side, for example a low-side winding or a high-side winding.
In some embodiments, transmitting the acoustic wave for the first predetermined duration to the winding with the acoustic wave transmitting device is concurrent with receiving the acoustic wave signal for the second duration with the acoustic wave receiving device of the group. The term "simultaneously" in this embodiment means that the sound wave transmitting device transmits sound waves and the sound wave receiving device receives sound waves simultaneously. In this example, the method for detecting and positioning a turn-to-turn short circuit of a transformer further includes: and determining the propagation speed of the sound wave signal in the winding based on the starting position of the sound wave signal received by the fault-free sound wave detection path in the time axis corresponding to the second time length. The method further includes determining a propagation speed in the winding based on a starting position of the acoustic wave signal received by the fault-free acoustic wave detection path on a time axis corresponding to the second time period, for example, determining a first time difference from when the acoustic wave signal starts to be received to when the acoustic wave signal starts to be received on the time axis of the second time period, and determining the propagation speed of the acoustic wave signal in the winding based on the height of the winding and the first time difference.
In some embodiments, in the case that it is determined that the winding has an inter-turn short circuit, the method for detecting and positioning an inter-turn short circuit of the transformer further includes: and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration. Specifically, on the basis of determining the propagation speed of the acoustic wave signal in the winding, the position of the turn-to-turn short circuit can be determined according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration.
In some embodiments, in an initial case, the acoustic wave detection path is perpendicular to a winding direction of the transformer, and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration includes:
determining a difference value between the starting time of the second duration and the starting time of the signal to be detected;
the location of the turn-to-turn short circuit is determined based on the product of the difference and the determined propagation velocity of the acoustic wave signal in the winding.
In this specific example, the position where the turn-to-turn short circuit occurs is taken as a sound source, so that the position of the turn-to-turn short circuit can be determined based on a second time difference between the starting position of the signal to be detected and the starting time of the second duration.
In some embodiments, after determining the location of the inter-turn short, the transformer inter-turn short detection positioning method further comprises:
and changing the receiving angle of the sound wave receiving device according to a preset angle interval, and repeatedly receiving the sound wave signals. Specifically, the method is based on the fact that a plurality of sound wave receiving devices and sound wave transmitting devices are arranged at intervals on the winding. Further in this example, the angular interval may be non-fixed, e.g., gradual, or fixed. The corresponding angle interval can be determined according to the distance of the interval arrangement, after the turn-to-turn short circuit of the sound wave detection passage is determined, the sound wave transmitting device of the sound wave detection passage can be repeatedly utilized to transmit sound wave signals, and the sound wave signals are repeatedly received by the sound wave receiving devices of other sound wave detection passages within a certain range on the left and right sides of the sound wave receiving device of the sound wave detection passage. In some cases where there is an inter-turn short circuit fault, the acoustic wave signal corresponding to the fault is received in this example with several acoustic wave receiving devices adjacent to the acoustic wave receiving device of the acoustic wave detection path.
And determining the degree of the turn-to-turn short circuit based on the sound wave signal received by the sound wave receiving device after the receiving angle is changed. In this example, the degree of the fault can be determined by using the diffraction phenomenon of the sound wave, and whether the sound wave receiving apparatus with the changed receiving angle can receive the sound wave signal of the fault position. In some examples, the degree of the turn-to-turn fault can be identified directly by utilizing the angle change of the acoustic wave receiving device, and overhaul references can be intuitively provided for subsequent overhauling staff by identifying the degree of the turn-to-turn short circuit fault, so that the overhaul and maintenance efficiency of the transformer is improved.
In some embodiments, determining the degree of the turn-to-turn short circuit based on the acoustic wave signal received by the acoustic wave receiving device after the change in the receiving angle includes:
and when the condition that the signal to be detected corresponding to the turn-to-turn short circuit is not received is determined, the sound wave receiving device is based on the angle change amount of the initial state. In the specific initial state, that is, the acoustic wave receiving device of the acoustic wave detection path with the turn-to-turn short circuit fault is detected, then the position of the corresponding acoustic wave receiving device is determined when the signal to be detected corresponding to the turn-to-turn short circuit cannot be received, and the distance from the acoustic wave receiving device to the initial position can be determined according to the position of the acoustic wave receiving device. Since the acoustic wave detection path that detects the fault is perpendicular to the winding direction of the winding, the amount of change in the angle between it and the fault point can also be determined based on the position.
And determining the width of the turn-to-turn short circuit fault according to the distance between the determined turn-to-turn short circuit position and the acoustic wave receiving device in the initial state, the angle change amount of the acoustic wave receiving device and the moving amount of the acoustic wave receiving device.
In this specific example, a trapezoid-like structure may be formed according to the angle change amount of the acoustic wave receiving device, the movement amount of the acoustic wave receiving device, and the width of the turn-to-turn short circuit fault. Based on the determined winding height and the position of the inter-turn short circuit, the height of the trapezoid structure can be determined, and further, the width of the inter-turn short circuit fault can be calculated according to the long side (namely the moving amount of the sound wave receiving device) and the corresponding angle.
In summary, the method can realize detection and positioning of the turn-to-turn short circuit fault of the transformer under the condition of not disassembling the transformer, and can be used for on-line turn-to-turn short circuit fault monitoring of the oil immersed transformer in some practical application scenes, so that the fault can be found at the initial stage of the fault, and the operation reliability of the transformer is improved. Meanwhile, the method can further judge the degree of turn-to-turn short circuit faults, provide clear fault indication for later maintenance personnel, and improve the working efficiency of the maintenance personnel.
The embodiment of the invention provides an acoustic wave-based turn-to-turn short circuit detection device of an oilpaper insulation transformer, wherein the transformer comprises a plurality of windings, a controller, an acoustic wave transmitting device and an acoustic wave receiving device, and the device comprises the following components:
a sound wave transmitting device is arranged on one side of the winding of the transformer, a sound wave receiving device is arranged on the other side of the winding, a sound wave detection passage covering the winding is formed based on a group of sound wave transmitting devices and sound wave receiving devices, and a set included angle is formed between the sound wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding based on the winding transformation ratio and the transformer capacity of the transformer, and determining the environmental temperature of the current test environment;
the controller is utilized to configure sound wave emission modes, different sound wave emission modes have corresponding sound wave emission parameters, wherein the sound wave emission parameters of different wire diameters, different winding heights and different environment temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peaks after passing through a similar sound wave detection passage under the condition of no faults; the method comprises the steps of,
transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode;
receiving acoustic signals of a second duration by using the acoustic receiving devices of the group, wherein the second duration is longer than the first duration;
filtering peak signals in a target peak range in the sound wave signals by using the controller to obtain signals to be detected;
judging whether the peak value of the signal to be detected exceeds a preset threshold value, and judging that the winding has inter-turn short circuit under the condition that the peak value exceeds the preset threshold value.
The embodiment of the invention provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the sound wave-based turn-to-turn short circuit detection method of the oil paper insulation transformer in the embodiments of the application when being executed by a processor.
Furthermore, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of the various embodiments across schemes), adaptations or alterations based on the present disclosure. Elements in the claims are to be construed broadly based on the language employed in the claims and are not limited to examples described in the present specification or during the practice of the present application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above detailed description, various features may be grouped together to streamline the disclosure. This is not to be interpreted as an intention that the disclosed features not being claimed are essential to any claim. Rather, the disclosed subject matter may include less than all of the features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with one another in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present disclosure, and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of parts may be made by those skilled in the art, which modifications and equivalents are intended to be within the spirit and scope of the present disclosure.
Claims (3)
1. The method for detecting the turn-to-turn short circuit of the oil paper insulating transformer based on the sound waves is characterized by comprising the following steps of:
a sound wave transmitting device is arranged on one side of the winding of the transformer, a sound wave receiving device is arranged on the other side of the winding, a sound wave detection passage covering the winding is formed based on a group of sound wave transmitting devices and sound wave receiving devices, and a set included angle is formed between the sound wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding based on the winding transformation ratio and the transformer capacity of the transformer, and determining the environmental temperature of the current test environment;
configuring sound wave emission modes, wherein different sound wave emission modes have corresponding sound wave emission parameters, and the sound wave emission parameters of different wire diameters, different winding heights and different environment temperatures are different, so that sound wave signals received by a sound wave receiving device have similar signal peaks after passing through a similar sound wave detection passage under the condition of no faults;
transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode;
receiving acoustic signals with a second time length by using the acoustic receiving devices of the group, wherein the second time length is longer than the first preset time length;
filtering peak signals in a target peak range in the sound wave signals to obtain signals to be detected;
judging whether the peak value of the signal to be detected exceeds a preset threshold value, and judging that the winding has turn-to-turn short circuit under the condition that the peak value exceeds the preset threshold value;
comparing the sound wave signals received by each winding or respectively receiving the sound wave signals at a plurality of positions of each winding to determine a fault-free sound wave detection path, and determining a target peak range by taking the sound wave signals received by the fault-free sound wave detection path as background signals;
transmitting sound waves of a first preset duration to the winding by using the sound wave transmitting device, and receiving sound wave signals of a second duration by using the sound wave receiving devices of the group;
the method for detecting and positioning the turn-to-turn short circuit of the transformer further comprises the following steps:
determining the propagation speed of the sound wave signal in the winding based on the initial position of the sound wave signal received by the fault-free sound wave detection path in a time axis corresponding to the second time length;
under the condition that the winding is judged to have inter-turn short circuit, the method for detecting and positioning the inter-turn short circuit of the transformer further comprises the following steps: determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration;
under the initial condition, the acoustic wave detection path is perpendicular to the winding direction of the transformer, and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration comprises:
determining a difference value between the starting time of the second duration and the starting time of the signal to be detected;
determining a location of an inter-turn short circuit based on a product of the difference and the determined propagation velocity of the acoustic wave signal in the winding;
after determining the position of the turn-to-turn short circuit, the transformer turn-to-turn short circuit detection positioning method further comprises the following steps:
changing the receiving angle of the sound wave receiving device according to a preset angle interval, and repeatedly receiving sound wave signals;
determining the degree of turn-to-turn short circuit based on the sound wave signal received by the sound wave receiving device after the receiving angle is changed;
based on the acoustic wave signal received by the acoustic wave receiving device after the receiving angle is changed, determining the degree of the turn-to-turn short circuit includes:
when the condition that the signal to be detected corresponding to the turn-to-turn short circuit cannot be received is determined, the angle change amount of the sound wave receiving device based on the initial state;
and determining the width of the turn-to-turn short circuit fault according to the distance between the determined turn-to-turn short circuit position and the acoustic wave receiving device in the initial state, the angle change amount of the acoustic wave receiving device and the moving amount of the acoustic wave receiving device.
2. An acoustic wave-based oil paper insulation transformer turn-to-turn short circuit detection device, the transformer comprises a plurality of windings, and is characterized in that a controller, an acoustic wave emission device and an acoustic wave receiving device comprise:
a sound wave transmitting device is arranged on one side of the winding of the transformer, a sound wave receiving device is arranged on the other side of the winding, a sound wave detection passage covering the winding is formed based on a group of sound wave transmitting devices and sound wave receiving devices, and a set included angle is formed between the sound wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding and the wire diameter of a high-voltage side winding of the transformer and the height of the winding based on the winding transformation ratio and the transformer capacity of the transformer, and determining the environmental temperature of the current test environment;
the controller is utilized to configure sound wave emission modes, different sound wave emission modes have corresponding sound wave emission parameters, wherein the sound wave emission parameters of different wire diameters, different winding heights and different environment temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peaks after passing through a similar sound wave detection passage under the condition of no faults; the method comprises the steps of,
transmitting sound waves of a first preset duration to the winding by utilizing a sound wave transmitting device based on the configured sound wave transmitting mode;
receiving acoustic signals with a second time length by using the acoustic receiving devices of the group, wherein the second time length is longer than the first preset time length;
filtering peak signals in a target peak range in the sound wave signals by using the controller to obtain signals to be detected;
judging whether the peak value of the signal to be detected exceeds a preset threshold value, and judging that the winding has turn-to-turn short circuit under the condition that the peak value exceeds the preset threshold value;
comparing the sound wave signals received by each winding or respectively receiving the sound wave signals at a plurality of positions of each winding to determine a fault-free sound wave detection path, and determining a target peak range by taking the sound wave signals received by the fault-free sound wave detection path as background signals;
transmitting sound waves of a first preset duration to the winding by using the sound wave transmitting device, and receiving sound wave signals of a second duration by using the sound wave receiving devices of the group;
the method for detecting and positioning the turn-to-turn short circuit of the transformer further comprises the following steps:
determining the propagation speed of the sound wave signal in the winding based on the initial position of the sound wave signal received by the fault-free sound wave detection path in a time axis corresponding to the second time length;
under the condition that the winding is judged to have inter-turn short circuit, the method for detecting and positioning the inter-turn short circuit of the transformer further comprises the following steps: determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration;
under the initial condition, the acoustic wave detection path is perpendicular to the winding direction of the transformer, and determining the position of the turn-to-turn short circuit according to the position of the starting position of the signal to be detected in the time axis corresponding to the second duration comprises:
determining a difference value between the starting time of the second duration and the starting time of the signal to be detected;
determining a location of an inter-turn short circuit based on a product of the difference and the determined propagation velocity of the acoustic wave signal in the winding;
after determining the position of the turn-to-turn short circuit, the transformer turn-to-turn short circuit detection positioning method further comprises the following steps:
changing the receiving angle of the sound wave receiving device according to a preset angle interval, and repeatedly receiving sound wave signals;
determining the degree of turn-to-turn short circuit based on the sound wave signal received by the sound wave receiving device after the receiving angle is changed;
based on the acoustic wave signal received by the acoustic wave receiving device after the receiving angle is changed, determining the degree of the turn-to-turn short circuit includes:
when the condition that the signal to be detected corresponding to the turn-to-turn short circuit cannot be received is determined, the angle change amount of the sound wave receiving device based on the initial state;
and determining the width of the turn-to-turn short circuit fault according to the distance between the determined turn-to-turn short circuit position and the acoustic wave receiving device in the initial state, the angle change amount of the acoustic wave receiving device and the moving amount of the acoustic wave receiving device.
3. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the sound wave based oil-paper insulation transformer turn-to-turn short detection method according to claim 1.
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