CN114755611A - Sound wave-based detection method and device for turn-to-turn short circuit of oil-paper insulation transformer - Google Patents
Sound wave-based detection method and device for 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 method and a device for detecting turn-to-turn short circuit of an oil-paper insulation transformer based on sound waves, wherein the method comprises the steps of arranging a sound wave transmitting device on one side of a winding of the transformer and arranging a sound wave receiving device 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 and the height of the windings; configuring an acoustic wave emission mode; based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device; receiving the acoustic wave signals with the acoustic wave receiving devices of the group for a second time period; filtering a peak signal in a target peak range in the sound wave signal to obtain a signal to be detected; and judging that the winding has turn-to-turn short circuit when the preset threshold value is exceeded. The method executes sound wave emission in a corresponding mode and receives the detection signal at the receiving end, so that whether turn-to-turn short circuit exists 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 sound wave-based turn-to-turn short circuit detection method and device for an oil-paper insulation transformer.
Background
With the rapid development of national economy, the scale of the power grid is rapidly enlarged, and the power transformation equipment is used as the core and hub of energy transmission in the power grid and must ensure continuous, stable and reliable operation to avoid major faults of the power grid. An oil-immersed transformer in a transformer device is the core of a transformer substation, bears large-capacity electric energy conversion and transmission, and safe and reliable operation of the transformer substation is the basis of normal and stable operation of a power grid.
In the prior art, the basic configuration of the transformer relay protection device is current quick-break protection and overcurrent protection. However, after the current protection operation, it can be determined only that the transformer has failed. However, it is impossible to determine whether or not the turn-to-turn short circuit occurs without disassembling the transformer, and further, to determine the specific position of the turn-to-turn short circuit.
Disclosure of Invention
The embodiment of the invention provides a sound wave-based detection method and device for turn-to-turn short circuit of an oil-paper insulation transformer, which can judge turn-to-turn short circuit faults without disassembling an oil-immersed transformer, and can judge specific positions of the turn-to-turn faults in some examples.
The embodiment of the invention provides a sound wave-based turn-to-turn short circuit detection method for an oil-paper insulated transformer, wherein the transformer comprises a plurality of windings and comprises the following steps:
arranging an acoustic wave transmitting device on one side of the winding of the transformer, and arranging an acoustic wave receiving device on the other side of the winding, wherein an acoustic wave detection passage covering the winding is formed on the basis of a group of acoustic wave transmitting devices and acoustic wave receiving devices, and the acoustic wave detection passage and the winding direction of the transformer have a set included angle;
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 windings based on the winding transformation ratio of the transformer and the capacity of the transformer, and determining the environmental temperature of the current test environment;
configuring sound wave transmitting modes, wherein different sound wave transmitting modes have corresponding sound wave transmitting parameters, and the sound wave transmitting parameters of different wire diameters, different winding heights and different environmental temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection path under the condition of no fault;
based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device;
Receiving the sound wave signals with a second time length by utilizing the sound wave receiving devices of the group, wherein the second time length is longer than the first time length;
filtering a peak signal in a target peak range in the sound wave signal to obtain a signal to be detected;
and judging whether the peak value of the signal to be detected exceeds a preset threshold value or not, and judging that the turn-to-turn short circuit exists in the winding under the condition that the peak value of the signal to be detected exceeds the preset threshold value.
In some embodiments, the comparison is based on acoustic signals received at each of the plurality of windings, or on acoustic signals respectively received at a plurality of locations of the plurality of windings, to determine a fault-free acoustic detection path, an
The target peak range is determined with the acoustic wave signal received by the non-faulty acoustic wave detection path as a background signal.
In some embodiments, transmitting the acoustic wave signal for the first predetermined duration to the top winding with the acoustic wave transmitting device is performed simultaneously with receiving the acoustic wave signal for the second predetermined duration with the acoustic wave receiving devices of the group;
the transformer turn-to-turn short circuit detection positioning method further comprises the following steps:
and determining the propagation speed of the acoustic wave signal in the winding based on the initial position of the acoustic wave signal received by the fault-free acoustic wave detection passage in the time axis corresponding to the second time length.
In some embodiments, in the case that it is determined that there is a turn-to-turn short circuit in the winding, the transformer turn-to-turn short circuit detection and location method further includes: and determining the position of the turn-to-turn short circuit according to the position of the initial position of the signal to be detected in the time axis corresponding to the second time length.
In some embodiments, in an initial situation, the acoustic wave detection path is perpendicular to a winding direction of the transformer, and determining a position of the turn-to-turn short circuit according to a position of a starting position of the to-be-detected signal in a time axis corresponding to the second time period includes:
determining a difference value between the starting time of the second time length and the starting time of the to-be-detected signal;
and determining the position of the turn-to-turn short circuit based on the product of the difference value and the determined propagation speed of the sound wave signal in the winding.
In some embodiments, after determining the location of the turn-to-turn short, the transformer turn-to-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 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 of the receiving angle includes:
determining the angle change quantity of the acoustic wave receiving device based on the initial state when the signal to be detected corresponding to the turn-to-turn short circuit cannot be received and extracted;
and determining the width of the turn-to-turn short circuit fault according to the distance from the determined position of the turn-to-turn short circuit to the sound wave receiving device in the initial state, the angle change amount of the sound wave receiving device and the movement amount of the sound wave receiving device.
The embodiment of the invention provides an oil paper insulation transformer turn-to-turn short circuit detection device based on sound waves, wherein the transformer comprises a plurality of windings, a controller, a sound wave transmitting device and a sound wave receiving device, and the device comprises:
arranging an acoustic wave transmitting device on one side of the winding of the transformer, and arranging an acoustic wave receiving device on the other side of the winding, wherein an acoustic wave detection passage covering the winding is formed on the basis of a group of acoustic wave transmitting devices and acoustic wave receiving devices, and the acoustic wave detection passage and the winding direction of the transformer have a set included angle;
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 windings based on the winding transformation ratio of the transformer and the capacity of the transformer, and determining the environmental temperature of the current test environment;
Configuring sound wave transmitting modes by using the controller, wherein different sound wave transmitting modes have corresponding sound wave transmitting parameters, and the sound wave transmitting parameters of different wire diameters, different winding heights and different environmental temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection path under the condition of no fault; and the number of the first and second groups,
based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device;
receiving the sound wave signals with a second time length by utilizing the sound wave receiving devices of the group, wherein the second time length is longer than the first time length;
filtering a peak signal in a target peak range in the sound wave signal by using the controller to obtain a signal to be detected;
and judging whether the peak value of the signal to be detected exceeds a preset threshold value or not, and judging that the turn-to-turn short circuit exists in the winding under the condition that the peak value of the signal to be detected 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 when the computer program is executed by a processor, the steps of the sound wave-based detection method for turn-to-turn short circuit of the oil-paper insulation transformer are realized.
The embodiment of the invention utilizes the configuration of the sound wave transmitting mode, executes sound wave transmission in the corresponding mode, and receives the detection signal at the receiving end, thereby judging whether the windings of the transformer have turn-to-turn short circuit or not, and in some examples, the specific position of the turn-to-turn short circuit can be judged.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
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 refer to like parts throughout the drawings. In the drawings:
fig. 1 is a basic flowchart of a turn-to-turn short circuit detection and positioning method for an oil immersed transformer in 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 transformer turn-to-turn short circuit detection and positioning method of the present application includes the following steps:
in step S101, an acoustic wave emitting 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 the acoustic wave emitting device and the acoustic wave receiving device, and the acoustic wave detection path has a set angle with the winding direction of the transformer. The sound wave emitting 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 signal. The sound emitting means and the sound receiving means can be arranged before the transformer is put into operation. For the situation that no air gap exists between transformer windings of the oil-immersed transformer and the windings of the turns coated with the insulating paper are arranged closely, in the example, the whole windings are taken into consideration, the sound wave emitting device is arranged on one side of the winding, and the sound 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 windings are determined based on the winding transformation ratio and the transformer capacity of the transformer, and the ambient temperature of the current test environment is determined. The specific transformer winding transformation ratio and the specific transformer capacity can be obtained by inquiring a transformer nameplate, the transformation ratio and the specific capacity of the transformer can be tested in advance according to the transformation ratio and the specific capacity of the transformer, and a relation table is prepared, so that the wire diameter of a transformer low-voltage side winding, the wire diameter of a transformer high-voltage side winding and the height of the windings under the conventional copper material are determined. The influence of the environmental temperature on the propagation speed of the sound wave in the conductor is further considered in the example, so that the accuracy of positioning the turn-to-turn short circuit fault position can be further ensured.
In step S103, sound wave emitting modes are configured, and different sound wave emitting modes have corresponding sound wave emitting parameters, where the sound wave emitting parameters of different wire diameters, different winding heights, and different ambient temperatures are different, so that the sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection path under the condition of no fault. In this example, the sound wave may be a conventional sound wave, the ultrasonic wave, and the like may be specifically determined according to actual needs, and the specific sound wave emission parameters may be obtained in advance through a test environment, 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 acoustic wave signal after being configured can be attenuated to a set amplitude interval under the condition that the acoustic wave signal passes through the fault-free acoustic wave detection passage. Specifically, a plurality of acoustic wave detection paths may be provided on the same item, for example, a plurality of acoustic wave emitting devices and acoustic wave receiving devices may be arranged on the same item of winding at specified distance intervals, so that the entire winding can be covered and a plurality of acoustic wave signals can be received based on the item of winding. The set amplitude interval referred to in this embodiment may be a narrow-range amplitude interval, and the setting of the narrow-range amplitude interval may focus only on the detected signal from the acoustic wave detection path in the signal processing process, shield the acoustic wave signal that may be propagated from the conductor, and facilitate the subsequent signal processing process. The sound wave configuration modes under various voltage levels can be obtained after a small amount of tests are performed by using the method, so that the method is applied to testing turn-to-turn short circuit faults under various scenes. And the complexity of the process of performing signal processing in the later period can be greatly reduced by configuring the sound wave transmitting mode without considering errors caused by factors such as environmental temperature and the like.
In step S104, based on the configured acoustic wave transmitting mode, the acoustic wave transmitting device transmits an acoustic wave to the winding for a first preset time period, and the acoustic wave receiving devices of the group receive an acoustic wave signal for a second time period, where the second time period is longer than the first time period. Specifically, the sound wave emitting device is used for emitting sound waves for a first preset time period to the sound wave detection passage of the winding. The testing mode of utilizing the sound wave can be at need not disassembling the transformer, even in the transformer operation process, according to appointed time interval to the transformer transmission sound wave signal to accomplish and detect, thereby realize electrified on-line operation monitoring. In this example, the manner of transmitting the sound wave of the first preset time duration is not limited, for example, the first preset time duration may be divided into a plurality of sub-time durations, and a small segment of sound wave signal is transmitted in each sub-time duration, so that the signal within the second preset time duration may be subjected to signal enhancement in subsequent signal processing, thereby facilitating signal filtering and the like in a later period. In this example, the acoustic wave receiving device of the acoustic wave detection path is turned on at the same time to receive the acoustic wave signal. In subsequent signal processing, the turn-to-turn short circuit fault can be specifically positioned according to the moment of starting to receive the sound wave signal.
In step S105, a peak signal in a target peak range in the acoustic wave signal is filtered out to obtain a to-be-detected signal. In this example, two peak ranges may be designed, for example, a first target peak range and a second target peak range, for filtering out the peak acoustic signal transmitted from the conductor and the peak acoustic signal from the acoustic detection path, respectively, because of the presence of the oilpaper, there may be two different attenuations compared to the case of only propagating in the conductor, especially for the case of the low-voltage side winding wire with a short length, the attenuation from the conductor may be lower than the attenuation from the acoustic detection path. In this example, after the peak signal within the target peak range in the acoustic wave signal is filtered, the possible fault signal can be obtained. The acoustic signal passes through a fault position with a turn-to-turn short circuit fault, and due to the fact that a conductor is in contact with the conductor and oil paper insulation is arranged between other turns, diffraction effect occurs at the fault position, in the example, the signal in the target peak value range is filtered, and therefore the signal to be detected can be determined.
In step S106, it is determined whether the peak value of the to-be-detected signal exceeds a preset threshold, and if the peak value exceeds the preset threshold, it is determined that the winding has a turn-to-turn short circuit. The specific range of the preset threshold may be determined in the present example in a retest environment. 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 sound wave detection path of the winding.
The method is a nondestructive detection method, and can obtain corresponding detection results without disassembling the transformer winding. In some examples, the specific position of the turn-to-turn short circuit can be judged, so that the maintenance work of the transformer can be guided.
In some embodiments, the comparison is based on acoustic signals received at each of the windings, or on acoustic signals received at a plurality of locations 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 non-faulty acoustic wave detection path as a background signal.
Specifically, the first target peak range may be obtained in such a manner that, in the case where all the acoustic wave detection paths of the item of winding determine that the item of winding is faulted ineffectively, the first target peak range is determined based on the acoustic wave signal received in the second time length range, and the first target peak range may be applied to the corresponding side, such as the low-voltage side winding or the high-voltage side winding.
For the second target peak range, it can be obtained by analyzing the plurality of acoustic wave detection paths of the winding to determine that there is no fault, and then determining the second target peak range by using 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 the corresponding side, for example the low-side winding or the high-side winding.
In some embodiments, transmitting the acoustic wave signal for the first predetermined duration to the top winding with the acoustic wave transmitting device is performed simultaneously with receiving the acoustic wave signal for the second predetermined duration with the acoustic wave receiving devices of the group. The term "simultaneously" in this embodiment means that the sound wave transmitting means transmits the sound wave and the sound wave receiving means receives the sound wave simultaneously. In this example, the transformer turn-to-turn short circuit detection and positioning method further includes: and determining the propagation speed of the acoustic wave signal in the winding based on the starting position of the acoustic wave signal received by the fault-free acoustic wave detection passage in the time axis corresponding to the second time length. In the present example, the propagation speed in the winding is further determined based on the starting position of the acoustic wave signal received by the fault-free acoustic wave detection path in the time axis corresponding to the second time period, for example, a first time difference from the beginning of receiving the acoustic wave signal to the receiving of the acoustic wave signal is determined in the time axis of the second time period, and based on the height of the winding and the first time difference, the propagation speed of the acoustic wave signal in the winding can be determined.
In some embodiments, in the case that it is determined that there is a turn-to-turn short circuit in the winding, the transformer turn-to-turn short circuit detection and location method further includes: and determining the position of the turn-to-turn short circuit according to the position of the initial position of the signal to be detected in the time axis corresponding to the second time length. Specifically, the position of the turn-to-turn short circuit may be determined according to the position of the starting position of the signal to be detected in the time axis corresponding to the second time duration on the basis of the determination of the propagation speed of the acoustic wave signal in the winding.
In some embodiments, in an initial situation, the acoustic wave detection path is perpendicular to a winding direction of the transformer, and determining a position of the turn-to-turn short circuit according to a position of a starting position of the to-be-detected signal in a time axis corresponding to the second time period includes:
determining a difference value between the starting time of the second time length and the starting time of the signal to be detected;
and determining the position of the turn-to-turn short circuit based on the product of the difference value and the determined propagation speed of the sound wave signal in the winding.
In the present embodiment, the position of the inter-turn short circuit is used as the sound source, so that the position of the inter-turn short circuit can be determined based on the second time difference between the starting position of the signal to be detected and the starting time of the second time length.
In some embodiments, after determining the location of the turn-to-turn short, the transformer turn-to-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. In particular, on the basis of the arrangement of a plurality of sound wave receiving devices and sound wave transmitting devices at intervals of the winding. Further in this example, the angular interval may be non-fixed, e.g. graduated, 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 emitting device of the sound wave detection passage can be repeatedly used for emitting the sound wave signal, and the sound wave receiving device of other sound wave detection passages in a certain range from left to right of the sound wave receiving device of the sound wave detection passage can be repeatedly used for receiving the sound wave signal. In some cases where there is a turn-to-turn short fault, several acoustic wave receiving devices adjacent to the acoustic wave receiving device of the acoustic wave detection path are utilized in this example to receive the acoustic wave signal corresponding to the fault.
And 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. In the present example, the degree of the failure can be determined by using the diffraction phenomenon of the acoustic wave, whether or not the acoustic wave receiving apparatus after the change of the reception angle can receive the acoustic wave signal of the failure position. In some examples, the degree of turn-to-turn faults can be directly identified by the angle change of the sound wave receiving device, and the degree of turn-to-turn short circuit faults can be identified, so that the overhaul reference can be visually provided for follow-up overhaul personnel, and 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 of the receiving angle includes:
and when the to-be-detected signal corresponding to the turn-to-turn short circuit cannot be received and extracted, determining the angle change quantity of the acoustic wave receiving device based on the initial state. Specifically, the initial state referred to in this example is also the sound wave receiving device of the sound wave detection path having the turn-to-turn short circuit fault, and then the position of the corresponding sound wave receiving device when the to-be-detected signal corresponding to the turn-to-turn short circuit cannot be received and extracted is determined, and the distance from the sound wave receiving device to the initial position can be determined according to the position of the sound wave receiving device. Since the acoustic wave detection path for detecting a failure is perpendicular to the winding direction of the winding, the amount of change in the angle thereof with respect to the failure 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 from the determined position of the turn-to-turn short circuit to the sound wave receiving device in the initial state, the angle change amount of the sound wave receiving device and the movement amount of the sound wave receiving device.
A trapezoid-like structure can 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 in the specific example. The height of the trapezoidal structure can be determined by making a difference according to the determined winding height and the turn-to-turn short circuit position, and the width of the turn-to-turn short circuit fault can be calculated according to the long side (namely the movement amount of the sound wave receiving device) and the corresponding angle.
In summary, the method can realize the detection and the 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 monitoring the on-line turn-to-turn short circuit fault 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 oil paper insulation transformer turn-to-turn short circuit detection device based on sound waves, wherein the transformer comprises a plurality of windings, a controller, a sound wave transmitting device and a sound wave receiving device, and the device comprises:
arranging an acoustic wave transmitting device on one side of the winding of the transformer, and arranging an acoustic wave receiving device on the other side of the winding, wherein an acoustic wave detection passage covering the winding is formed on the basis of a group of acoustic wave transmitting devices and acoustic wave receiving devices, and a set included angle is formed between the acoustic wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding of the transformer, the wire diameter of a high-voltage side winding and the height of the windings based on the winding transformation ratio of the transformer and the capacity of the transformer, and determining the environmental temperature of the current testing environment;
Configuring sound wave transmitting modes by using the controller, wherein different sound wave transmitting modes have corresponding sound wave transmitting parameters, and the sound wave transmitting parameters of different wire diameters, different winding heights and different environmental temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection path under the condition of no fault; and (c) a second step of,
based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device;
receiving the sound wave signals with a second time length by utilizing the sound wave receiving devices of the group, wherein the second time length is longer than the first time length;
filtering a peak signal in a target peak range in the sound wave signal by using the controller to obtain a signal to be detected;
and judging whether the peak value of the signal to be detected exceeds a preset threshold value or not, and judging that the turn-to-turn short circuit exists in the winding under the condition that the peak value of the signal to be detected 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 when the computer program is executed by a processor, the steps of the sound wave-based detection method for turn-to-turn short circuit of the oil-paper insulation transformer are realized.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure having equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the 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 versions 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 foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, the subject matter of the present disclosure may lie in less than all 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 each other 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 equivalents of the invention which are within the spirit and scope of the disclosure may occur to persons skilled in the art and are considered to be within the scope of the invention.
Claims (9)
1. A method for detecting turn-to-turn short circuit of an oil-paper insulation transformer based on sound waves, wherein the transformer comprises a plurality of windings, and is characterized by comprising the following steps:
arranging an acoustic wave transmitting device on one side of the winding of the transformer, and arranging an acoustic wave receiving device on the other side of the winding, wherein an acoustic wave detection passage covering the winding is formed on the basis of a group of acoustic wave transmitting devices and acoustic wave receiving devices, and a set included angle is formed between the acoustic wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding of the transformer, the wire diameter of a high-voltage side winding and the height of the windings based on the winding transformation ratio of the transformer and the capacity of the transformer, and determining the environmental temperature of the current testing environment;
configuring sound wave transmitting modes, wherein different sound wave transmitting modes have corresponding sound wave transmitting parameters, and sound wave transmitting parameters of different wire diameters, different winding heights and different environmental temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection passage under the condition of no fault;
Based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device;
receiving the sound wave signals with a second time length by utilizing the sound wave receiving devices of the group, wherein the second time length is longer than the first time length;
filtering a peak signal in a target peak range in the sound wave signal to obtain a signal to be detected;
and judging whether the peak value of the signal to be detected exceeds a preset threshold value or not, and judging that the turn-to-turn short circuit exists in the winding under the condition that the peak value of the signal to be detected exceeds the preset threshold value.
2. The method according to claim 1, wherein the comparison is performed based on the received acoustic signals at each winding or based on the received acoustic signals at multiple locations of the winding to determine a fault-free acoustic detection path, and
the target peak range is determined with the acoustic wave signal received by the non-faulty acoustic wave detection path as a background signal.
3. The method for detecting turn-to-turn short circuit of an acoustic-wave-based paper oil-insulated transformer according to claim 2, characterized in that the transmitting of the acoustic wave with a first preset duration to the winding by the acoustic wave transmitting device and the receiving of the acoustic wave with a second duration by the group of acoustic wave receiving devices are performed simultaneously;
The transformer turn-to-turn short circuit detection positioning method further comprises the following steps:
and determining the propagation speed of the acoustic wave signal in the winding based on the initial position of the acoustic wave signal received by the fault-free acoustic wave detection passage in the time axis corresponding to the second time length.
4. The method for detecting turn-to-turn short circuit of oil-paper insulation transformer based on acoustic wave according to claim 3, wherein when turn-to-turn short circuit of the winding is judged, the method for detecting and positioning turn-to-turn short circuit of transformer further comprises: and determining the position of the turn-to-turn short circuit according to the position of the initial position of the signal to be detected in the time axis corresponding to the second time length.
5. The method for detecting turn-to-turn short circuit of oil-paper insulated transformer based on acoustic wave according to claim 4, wherein in the initial condition, the acoustic wave detection path is perpendicular to the winding direction of the transformer, and determining the position of turn-to-turn short circuit according to the position of the initial position of the signal to be detected in the time axis corresponding to the second time period comprises:
determining a difference value between the starting time of the second time length and the starting time of the signal to be detected;
and determining the position of the turn-to-turn short circuit based on the product of the difference value and the determined propagation speed of the sound wave signal in the winding.
6. The acoustic wave based detection method for the turn-to-turn short circuit of the oil-paper insulated transformer according to claim 5, wherein after the position of the turn-to-turn short circuit is determined, the detection and positioning method for the turn-to-turn short circuit of the transformer 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 turn-to-turn short circuit based on the sound wave signal received by the sound wave receiving device after the receiving angle is changed.
7. The method for detecting turn-to-turn short circuit of an oil-paper insulated transformer based on sound waves according to claim 6, wherein the step of determining the degree of turn-to-turn short circuit based on the sound wave signals received by the sound wave receiving device after the receiving angle is changed comprises the following steps:
determining the angle change quantity of the acoustic wave receiving device based on the initial state when the signal to be detected corresponding to the turn-to-turn short circuit cannot be received and extracted;
and determining the width of the turn-to-turn short circuit fault according to the distance from the determined position of the turn-to-turn short circuit to the sound wave receiving device in the initial state, the angle change amount of the sound wave receiving device and the movement amount of the sound wave receiving device.
8. The utility model provides an oil paper insulation transformer turn-to-turn short circuit detection device based on sound wave, the transformer includes multinomial winding, its characterized in that, controller, sound wave emitter and sound wave receiver include:
Arranging an acoustic wave transmitting device on one side of the winding of the transformer, and arranging an acoustic wave receiving device on the other side of the winding, wherein an acoustic wave detection passage covering the winding is formed on the basis of a group of acoustic wave transmitting devices and acoustic wave receiving devices, and a set included angle is formed between the acoustic wave detection passage and the winding direction of the transformer;
determining the wire diameter of a low-voltage side winding of the transformer, the wire diameter of a high-voltage side winding and the height of the windings based on the winding transformation ratio of the transformer and the capacity of the transformer, and determining the environmental temperature of the current testing environment;
configuring sound wave transmitting modes by using the controller, wherein different sound wave transmitting modes have corresponding sound wave transmitting parameters, and the sound wave transmitting parameters of different wire diameters, different winding heights and different environmental temperatures are different, so that sound wave signals received by the sound wave receiving device have similar signal peak values after passing through a similar sound wave detection path under the condition of no fault; and (c) a second step of,
based on the configured sound wave transmitting mode, transmitting sound waves of a first preset time length to the winding by using a sound wave transmitting device;
receiving the sound wave signals with a second time length by utilizing the sound wave receiving devices of the group, wherein the second time length is longer than the first time length;
Filtering a peak signal in a target peak range in the sound wave signal by using the controller to obtain a signal to be detected;
and judging whether the peak value of the signal to be detected exceeds a preset threshold value or not, and judging that the turn-to-turn short circuit exists in the winding under the condition that the peak value of the signal to be detected exceeds the preset threshold value.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the acoustic wave-based oil-and-paper insulated transformer inter-turn short detection method according to any one of claims 1 to 7.
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