CN110926673A - Device for measuring short circuit force of power transformer - Google Patents
Device for measuring short circuit force of power transformer Download PDFInfo
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- CN110926673A CN110926673A CN201911216331.8A CN201911216331A CN110926673A CN 110926673 A CN110926673 A CN 110926673A CN 201911216331 A CN201911216331 A CN 201911216331A CN 110926673 A CN110926673 A CN 110926673A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0052—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to impact
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Abstract
The invention discloses a device for measuring the short-circuit force of a power transformer, which relates to the technical field of power transformer measurement, and comprises: a transformer; the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape; the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire; and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire. The technical problem that the transformer winding is easy to damage due to insufficient short-circuit resistance caused by impact of short-circuit force in the prior art is solved, the technical effects that the cost is low, data of axial force and radial force in the winding can be accurately and reliably measured, calculation software of related transformer winding short-circuit force is finally corrected, and the capability of the transformer winding for bearing short-circuit accidents is improved are achieved.
Description
Technical Field
The invention relates to the technical field of power transformer measurement, in particular to a device for measuring the short-circuit force of a power transformer.
Background
At present, the voltage grade of the power system is continuously improved, and the system capacity and the single capacity of a transformer are also continuously increased. Under the condition that the short-circuit impedance of the transformer is certain, the threat of the short-circuit electromagnetic force to the transformer is more serious. The operation practice of the power department in China shows that no matter the transformer produced by domestic manufacturers or imported transformers purchased from foreign countries have accidents of damage caused by insufficient short-circuit resistance of windings under the impact of short-circuit force. Therefore, in order to ensure safe and reliable operation of the transformer, it is necessary to try to improve the ability of the transformer windings to withstand short circuit events. The improvement of short-circuit resistance of the transformer winding is still a technical problem worthy of deep research and serious treatment for transformer manufacturing enterprises of various countries at present.
Another important reason is that the price requirements of power transformers, especially distribution transformers, are very strict when the local grid companies bid for purchase, and the manufacturer has a very low profit or even higher than the production cost when meeting the purchase price, which requires that the production cost of the transformers is reduced as much as possible while meeting the short-circuit tolerance of the transformers.
However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the above prior art has at least the following technical problems:
in the prior art, if the profit of the transformer is met and the cost is reduced, the short-circuit resistance of the transformer winding is not enough and the transformer winding is damaged easily during a short-circuit test; if the short-circuit test of the transformer is satisfied, the profit is very thin and even loss is generated due to cost reasons.
Disclosure of Invention
The embodiment of the invention provides a device for measuring the short-circuit force of a power transformer, which is used for solving the technical problem that the short-circuit force impact easily causes the accident that the short-circuit resistance of a transformer winding is not enough and the transformer winding is damaged in the prior art, and achieves the technical effects that the cost is low, the data of the axial force and the radial force in the winding can be accurately and reliably measured, the calculation software of the short-circuit force of the related transformer winding is finally corrected, and the capability of the transformer winding for bearing the short-circuit accident is improved.
The embodiment of the invention provides a device for measuring the short-circuit force of a power transformer, which comprises: a transformer; the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape; the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire; and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire.
Preferably, the piezoelectric film sensor is arranged at the position of a nail on the upper part of a winding of the transformer, below a coil end part or a middle coil block and between turns of an outer winding wire.
Preferably, the periphery of the piezoelectric film sensor is coated by an aluminum foil or a copper foil, and the piezoelectric film sensor is connected with a shielding net in the shielding wire after being compacted.
Preferably, the aluminum foil or the copper foil is disposed between the insulating tape and the piezoelectric thin film sensor.
Preferably, the piezoelectric film sensor is fixed on the transformer by using a polyimide tape and an electrical insulating tape.
Preferably, the oscilloscope and the processing unit are both powered by batteries.
Preferably, the insulation distance between the oscilloscope and the processing unit relative to the ground is more than one meter.
Preferably, the insulation wrapping mode of the piezoelectric film sensor is adjusted according to the voltage grade and the insulation grade of the transformer.
Preferably, the pressing length and the pressing force of the piezoelectric film sensor are adjusted according to the voltage grade and the insulation grade of the transformer.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a device for measuring the short-circuit force of a power transformer, which comprises: a transformer; the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape; the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire; and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire. The technical problem that the transformer winding is easy to damage due to insufficient short-circuit resistance caused by impact of short-circuit force in the prior art is solved, the technical effects that the cost is low, data of axial force and radial force in the winding can be accurately and reliably measured, calculation software of related transformer winding short-circuit force is finally corrected, and the capability of the transformer winding for bearing short-circuit accidents is improved are achieved.
2. The periphery of the piezoelectric film sensor is coated by the aluminum foil or the copper foil, and the piezoelectric film sensor is connected with the shielding net in the shielding wire after being compacted. The technical effect of overcoming the defect that the piezoelectric film is greatly influenced by electromagnetic interference is further achieved.
3. According to the invention, the oscilloscope and the processing unit are both powered by batteries, so that the technical effect of avoiding the impact on the measuring device when the transformer winding is in short circuit is further achieved.
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
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for measuring a short-circuit force of a power transformer according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sensor mounting of an apparatus for measuring axial short circuit force in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sensor parameter calculation process according to an embodiment of the present invention.
Description of reference numerals: 1-a piezoelectric thin film sensor; 2-an oscilloscope; 3-a processing unit; l1-sensor insertion depth; l2-sensor insulation length; l3-distance of sensor installation from outer coil; f-the pressing force of the sensor.
Detailed Description
The embodiment of the invention provides a device for measuring a short-circuit force of a power transformer, which solves the technical problem that in the prior art, due to the impact of the short-circuit force, the transformer winding is easy to be damaged due to insufficient short-circuit resistance.
The technical scheme in the embodiment of the invention has the following overall structure: a transformer; the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape; the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire; and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire. The technical effects of low cost, accurate and reliable measurement of the data of the axial force and the radial force in the winding, final correction of the calculation software of the short-circuit force of the related transformer winding and improvement of the capability of the transformer winding to bear the short-circuit accident are achieved
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present embodiment provides an apparatus for measuring a short-circuit force of a power transformer, including:
a transformer; the piezoelectric film sensor 1 is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor 1 is fixed on the transformer through an insulating adhesive tape;
specifically, when current passes through the transformer winding, electromagnetic mechanical force is generated in the winding due to the action of the current and the leakage magnetic field, the magnitude of the electromagnetic mechanical force is determined by the product of the flux density of the leakage magnetic field and the current of the lead, and the direction of the force is determined by the left-hand rule. The forces acting on the wires are small when the transformer is operating under normal load. When sudden short circuit occurs, the maximum short circuit current is 25-30 times of the rated current or even more; the electromagnetic forces generated between the windings during a short circuit are proportional to the square of the short circuit current, so that the mechanical forces during a short circuit will be roughly hundreds of times or even more than those during normal operation, e and the forces are generated very rapidly, and the circuit breaker has no time to break the circuit in such a very short time. Therefore, the winding is deformed under the action of a huge short-circuit electromagnetic force, so that the piezoelectric film sensor 1 is stressed and then generates a corresponding electric signal.
The oscilloscope 2 is used for acquiring the electric signals, and the oscilloscope 2 is connected with the piezoelectric film sensor 1 through a shielding wire;
specifically, the oscilloscope 2 is configured to read an electrical signal sent by the piezoelectric thin film sensor 1, and further send the electrical signal to the processing unit 3, and the oscilloscope 2 is connected to the piezoelectric thin film sensor 1 and the processing unit 3 through shielded wires, respectively.
And the processing unit 3 is used for processing the electric signals, and the processing unit 3 is connected with the oscilloscope 2 through a shielded wire.
Further, the oscilloscope 2 and the processing unit 3 are both powered by batteries.
Further, the insulation distance between the oscilloscope 2 and the processing unit 3 relative to the ground is more than one meter.
Specifically, the electrical signal generated by the piezoelectric thin film sensor 1 is read by the oscilloscope 2, and finally post-processed by the processing unit 3, and if the voltage amplitude exceeds the range of the oscilloscope 1, signal attenuation is required at this time, and corresponding restoration is performed until the processing unit 3 processes the signal. In addition, the processing unit 3 and the oscilloscope 2 should be powered by batteries as much as possible, so that the potential of the whole measuring system is the same as the potential of the measured point, thereby further avoiding the impact on the measuring system when the transformer winding is short-circuited.
Further, the piezoelectric film sensor 1 is arranged at a nail pressing position on the upper portion of a winding of the transformer, below a winding end portion or a middle inter-cake cushion block and at an inter-cake turn position of an outer winding wire.
Furthermore, the periphery of the piezoelectric film sensor 1 is wrapped by an aluminum foil or a copper foil, and is connected with a shielding net in the shielding wire after being compacted.
Further, the aluminum foil or the copper foil is disposed between the insulating tape and the piezoelectric film sensor 1.
Further, the piezoelectric film sensor 1 is fixed on the transformer by using a polyimide tape and an electrical insulating tape.
Furthermore, the insulation wrapping mode of the piezoelectric film sensor is adjusted according to the voltage grade and the insulation grade of the transformer.
Furthermore, the pressing length and the pressing force of the piezoelectric film sensor are adjusted according to the voltage grade and the insulation grade of the transformer.
Specifically, the piezoelectric film sensor 1 is connected to a shielded wire after being insulated by a polyimide tape, and then fixed between the transformer winding measurement points by an aluminum foil or a copper foil and an electrical insulating tape. The piezoelectric film sensor 1 is made of PVDF material, and is fixed on the transformer through a polyimide adhesive tape and a high-voltage electrical insulating adhesive tape, and the inside of the insulating adhesive tape is shielded by an aluminum foil. The piezoelectric film (PVDF), namely, the polyvinylidene fluoride high-molecular piezoelectric heat exchange energy material has the characteristics of wide frequency response, large dynamic range, high force-electricity conversion sensitivity, high mechanical property strength, easy matching of acoustic impedance and the like, has the advantages of light weight, softness, no brittleness, impact resistance, difficulty in being polluted by water and chemical articles, easiness in processing sheets with different shapes and areas and the like, and is easy to be subjected to electromagnetic interference, so that the periphery of the piezoelectric film sensor 1 needs to be wrapped with an aluminum foil or a copper foil to shield part of noise waves, the defect that the piezoelectric film is greatly influenced by the electromagnetic interference can be overcome, and the piezoelectric film sensor 1 is mainly distributed at the pressing nail position on the upper part of a winding of a transformer, the end part of an outer winding or under a middle inter-cake cushion block and the inter-cake turn position of the end part of the outer winding. The sensor and the shielding wire need to use an aluminum foil or a copper foil to completely wrap the connecting part, and then are fixed by an electrical insulating tape.
Furthermore, the piezoelectric film sensor 1 is wrapped in insulation in different thicknesses, different lengths and different modes according to the transformer products with different voltage grades and different insulation grades, namely, the piezoelectric film sensor 1 for acquiring data adopts insulation wrapping modes in different thicknesses, different lengths and different modes according to the transformers with different voltage grades and different insulation grades; the piezoelectric film sensor 1 for collecting data adopts different pressing lengths and pressing forces according to transformers with different voltage grades and insulation grades.
Further, as shown in fig. 2 and 3, after the voltage level, the insulation level and the coil structure parameter are input and program calculation is performed, the wrapping thickness, the wrapping length, the pre-tightening force and the creepage distance of the sensor can be correspondingly output, which includes: the insertion depth L1 of the sensor, the wrapping insulation length L2 of the sensor, the minimum distance L3 between the sensor and the outer coil and the pretightening force F of the sensor, namely, the interturn voltage, the intertidal voltage and the end electric field intensity can be calculated through the program flow, and the parameters of the insulation thickness, the insulation length and the like of the sensor are all based on the calculation result of the program.
For example: the model of the transformer to be tested is S13-800/10, the capacity is 800kVA, the high voltage is 10kV voltage level, the continuous winding, the wire gauge of the lead wire is 0.45-2.5X7.5, the number of turns of the coil is 499, the number of segments is 46, the average number of turns of each segment is 10.85, the average oil passage is 3mm, the inner diameter of the coil is 302mm, the outer diameter is 376mm, the height of the coil is 510mm, and the insulation level is A level; after the program inputs relevant parameters, the following parameters are obtained through calculation:
the sensor insertion depth L1 is 20 mm;
the binding insulation length L2 of the sensor is 200 mm;
the minimum distance L3 between the sensor and the outer coil is 50 mm;
the pretightening force F of the sensor is 2 MPa.
Therefore, the device overcomes the defect that the piezoelectric film is greatly influenced by electromagnetic interference, can accurately and reliably measure the data of the axial force and the radial force in the winding, and finally corrects the calculation software of the short-circuit force of the related transformer winding, thereby improving the technical effect of the capability of the transformer winding for bearing the short-circuit accident.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a device for measuring the short-circuit force of a power transformer, which comprises: a transformer; the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape; the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire; and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire. The technical problem that the transformer winding is easy to damage due to insufficient short-circuit resistance caused by impact of short-circuit force in the prior art is solved, the technical effects that the cost is low, data of axial force and radial force in the winding can be accurately and reliably measured, calculation software of related transformer winding short-circuit force is finally corrected, and the capability of the transformer winding for bearing short-circuit accidents is improved are achieved.
2. The periphery of the piezoelectric film sensor is coated by the aluminum foil or the copper foil, and the piezoelectric film sensor is connected with the shielding net in the shielding wire after being compacted. The technical effect of overcoming the defect that the piezoelectric film is greatly influenced by electromagnetic interference is further achieved.
3. According to the invention, the oscilloscope and the processing unit are both powered by batteries, so that the technical effect of avoiding the impact on the measuring device when the transformer winding is in short circuit is further achieved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (9)
1. An apparatus for measuring short circuit force of a power transformer, the apparatus comprising:
a transformer;
the piezoelectric film sensor is used for acquiring stress data among a plurality of windings of the transformer and generating an electric signal, and the piezoelectric film sensor is fixed on the transformer through an insulating adhesive tape;
the oscilloscope is used for acquiring the electric signal and is connected with the piezoelectric film sensor through a shielding wire;
and the processing unit is used for processing the electric signals and is connected with the oscilloscope through a shielding wire.
2. The apparatus of claim 1, wherein the piezoelectric film sensor is disposed at an upper winding tack, below an end or middle pancake spacer, and between outer winding coil turns of the transformer.
3. The device of claim 1, wherein the periphery of the piezoelectric film sensor is covered by an aluminum foil or a copper foil, and the piezoelectric film sensor is connected with the shielding net in the shielding wire after being compacted.
4. The apparatus of claim 3, wherein the aluminum or copper foil is disposed between the insulating tape and the piezoelectric film sensor.
5. The apparatus of claim 1, wherein the piezoelectric film sensor is fixed to the transformer using a polyimide tape and an electrical insulating tape.
6. The apparatus of claim 1, wherein the oscilloscope and the processing unit are both battery powered.
7. The apparatus of claim 1, wherein the oscilloscope is isolated from the processing unit by an isolation distance of greater than one meter from ground.
8. The apparatus of claim 1, wherein the insulation pack of the piezoelectric film sensor is adjusted according to a voltage level and an insulation level of the transformer.
9. The apparatus of claim 1, wherein the pressing length and the pressing force of the piezoelectric film sensor are adjusted according to a voltage level and an insulation level of the transformer.
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| CN201911216331.8A CN110926673A (en) | 2019-12-02 | 2019-12-02 | Device for measuring short circuit force of power transformer |
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| CN201911216331.8A CN110926673A (en) | 2019-12-02 | 2019-12-02 | Device for measuring short circuit force of power transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781534A (en) * | 2020-06-04 | 2020-10-16 | 湖南大学 | Method and device for testing short-circuit resistance of transformer |
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