CN213660189U - Novel dry-type test transformer - Google Patents
Novel dry-type test transformer Download PDFInfo
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- CN213660189U CN213660189U CN202022886008.6U CN202022886008U CN213660189U CN 213660189 U CN213660189 U CN 213660189U CN 202022886008 U CN202022886008 U CN 202022886008U CN 213660189 U CN213660189 U CN 213660189U
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- shielding layer
- voltage coil
- control box
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- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 239000003822 epoxy resin Substances 0.000 claims abstract description 10
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 16
- 230000036961 partial effect Effects 0.000 abstract description 14
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000002238 attenuated effect Effects 0.000 abstract description 5
- 230000002829 reductive effect Effects 0.000 description 9
- 238000010125 resin casting Methods 0.000 description 8
- 230000005672 electromagnetic field Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model provides a novel dry-type testing transformer, which belongs to the technical field of transformers and comprises a control box, universal wheels are fixedly arranged at four corners of the lower end of the control box, a plurality of radiating grooves are arranged on the right side wall of the upper end of the control box, the upper ends of the radiating grooves are fixedly connected with a handle through nuts, a base is fixedly arranged at the lower end of the inner part of the control box, epoxy resin pouring bodies are respectively arranged at the outer sides of a low-voltage coil and a high-voltage coil, the shapes of an inner shielding layer and an outer shielding layer are open annular cylinder shapes, the heights of the inner shielding layer and the outer shielding layer are consistent with the heights of the low-voltage coil and the high-voltage coil, one winding of the low-voltage coil and the high-voltage coil is connected in a triangular shape, high-frequency signals from a power supply side can be attenuated through the isolation transformer, but low, the stability and the accuracy of the partial discharge measurement of the dry-type transformer are improved.
Description
Technical Field
The utility model belongs to the technical field of the transformer, concretely relates to novel dry-type testing transformer.
Background
The dry test transformers should be subjected to partial discharge measurements with a maximum value of 10pC for the partial discharge level. The measurement process of the partial discharge of the dry-type transformer has a plurality of interference factors, wherein the interference from the test power supply is one of the interference factors, the interference from the test power supply comprises the switching operation of a power supply network, the discharge of a generator set, a voltage regulator and an intermediate transformer, the high-voltage corona and the point discharge of a test loop, the multipoint grounding of a grounding system, the poor contact of a current-carrying joint, a radio emission signal and the like, these interference signals can be coupled and introduced into the tested transformer by the test power circuit, and are mistaken for the discharge pulse of the transformer, sometimes the interference partial discharge amount is multiplied, this will affect the stability and accuracy of the partial discharge measurement of the dry-type transformer, even if some interfering signals are greater than the partial discharge level of the dry-type transformer, making the measurement impossible, in addition, the existing dry-type test transformer generates a large amount of heat in the test process and is inconvenient to dissipate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a novel dry-type test transformer aims at solving among the prior art this kind of isolation transformer self and does not produce partial discharge to can come the high frequency signal of power supply side through this isolation transformer decay, nevertheless can let the test voltage and the electric current of low frequency pass through the problem.
In order to achieve the above object, the utility model provides a following technical scheme: a novel dry-type test transformer comprises a control box, universal wheels are fixedly mounted at four corners of the lower end of the control box, a plurality of radiating grooves are formed in the right side wall of the upper end of the control box, the upper ends of the radiating grooves are fixedly connected with a handle through nuts, a base is fixedly mounted at the lower end of the inner portion of the control box, an iron core is fixedly connected to the upper end of the base, a low-voltage coil and a high-voltage coil which correspond to each other are arranged in the circumferential direction of the iron core from inside to outside, epoxy resin casting bodies are respectively arranged on the outer sides of the low-voltage coil and the high-voltage coil, an inner shielding layer is arranged on the circumference between the low-voltage coil and the iron core, an outer shielding layer is arranged on the circumference between the low-voltage coil and the high-voltage coil, the inner shielding layer and the outer shielding layer are in, one winding of the low-voltage coil and the high-voltage coil is in triangular connection, and the high-voltage coil is light in weight, small in size, attractive in appearance, stable in performance, convenient to use and carry, safe and reliable.
As an optimization of the present invention, the upper and lower clamping members have upper iron yokes fixedly mounted on the inner sides thereof, and the upper and lower clamping members have high-voltage terminals fixedly mounted on the outer surfaces thereof.
As an optimization of the utility model, the outside surface of outer shielding layer is equipped with the joint, the inboard fixed mounting of outer shielding layer has the cooling air flue.
As an optimization, the base upper end has the cushion through bolt threaded connection, the upper end of cushion is equipped with the gasket.
Preferably, the designed value of the magnetic flux density of the iron core is below the saturation point, and the iron core is mounted on the base.
As an optimization of the utility model, internal shield layer and outer shielding layer are the metal forming, internal shield layer and outer shielding layer all ground connection.
As an optimization, one deck rubber insulation layer has been laid to the interior bottom of control box, and is fixed through the mode that bonds between rubber insulation layer and the control box.
Compared with the prior art, the beneficial effects of the utility model are that:
1. when the voltage of the isolation transformer is lower than the rated voltage of the isolation transformer, partial discharge is not generated by the isolation transformer when the voltage of the isolation transformer is operated, meanwhile, the interference from a power supply attenuates signals to more than 1 order of magnitude, high-frequency signals from the power supply side can be attenuated by the isolation transformer, but low-frequency test voltage and low-frequency current can pass through the isolation transformer, so that the external signal interference is greatly reduced, the stability and the accuracy of the measurement of the partial discharge of the dry-type transformer are improved, the dry-type transformer is light in weight, small in size, attractive in appearance, stable in performance, convenient to use and carry, stable, safe and reliable;
2. the outer shielding layer is used for a power cable to pass through a large current, a magnetic field is generated around the current, so that other elements are not influenced, the electromagnetic field can be shielded in the cable by the shielding layer, and the outer shielding layer is provided with a cooling air channel to convey cooling air to a part needing cooling or an air pipeline for outputting cooling air from the part needing cooling.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the internal structure of the control box of the present invention;
fig. 3 is a schematic view of a partial structure at a in fig. 2 according to the present invention.
In the figure: 1. a control box; 2. a universal wheel; 3. a heat sink; 4. an iron core; 5. a cooling air passage; 6. cushion blocks; 7. a high-voltage coil; 8. an upper iron yoke; 9. carrying by hand; 10. an upper clamp and a lower clamp; 11. a joint; 12. a base; 13. a low-voltage coil; 14. a high voltage terminal; 15. an inner shield layer; 16. an outer shield layer; 17. and (3) epoxy resin casting.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1-3, the present invention provides the following technical solutions: a novel dry-type test transformer comprises a control box 1, universal wheels 2 are fixedly installed at four corners of the lower end of the control box 1, a plurality of radiating grooves 3 are formed in the right side wall of the upper end of the control box 1, handles 9 are fixedly connected to the upper ends of the radiating grooves 3 through nuts, a base 12 is fixedly installed at the lower end of the inner portion of the control box 1, an iron core 4 is fixedly connected to the upper end of the base 12, a low-voltage coil 13 and a high-voltage coil 7 which correspond to each other are arranged on the iron core 4 from inside to outside in the circumferential direction, epoxy resin casting bodies 17 are respectively arranged on the outer sides of the low-voltage coil 13 and the high-voltage coil 7, the heat resistance, the cold resistance, the wear resistance and the heat conductivity of the epoxy resin casting bodies 17 can also be improved, the hardness and the chemical corrosion resistance of the casting pieces can be improved, the shrinkage rate and the thermal expansion coefficient of the casting pieces can be reduced, the cost can also, the magnetic field can be generated around the current, so that other elements are not influenced, the electromagnetic field can be shielded in the cable by the shielding layer, high-frequency signals from the power supply side can be attenuated by the isolation transformer, low-frequency test voltage and current can pass through the isolation transformer, external signal interference is greatly reduced, and the stability and the accuracy of the partial discharge measurement of the dry-type transformer are improved.
In the embodiment of the utility model, the universal wheel 2 is fixedly arranged at the four corners of the lower end of the control box 1 to facilitate movement, the control box 1 is made of insulating special material and has higher insulation resistance and compressive strength, and can avoid accidents such as electric leakage and breakdown, a plurality of radiating grooves 3 are arranged on the right side wall of the upper end of the control box 1, the radiating grooves 3 are grooved to increase the radiating area, the upper end of the radiating grooves 3 is provided with a handle 9 to be better transported, the lower end of the inner part of the control box 1 is fixedly provided with a base 12, the upper end of the base 12 is fixedly connected with an iron core 4, the iron core 4 is circumferentially provided with a low-voltage coil 13 and a high-voltage coil 7 which correspond to each other from inside to outside, the low-voltage coil 13 and the high-voltage coil 7 are respectively provided with an epoxy resin casting body 17, the heat resistance, cold resistance, wear resistance and heat conductivity of the epoxy resin casting body 17, the shrinkage rate and the thermal expansion coefficient of a pouring piece can be reduced, the cost can also be reduced, the inner shielding layer 15 arranged on the circumference between the low-voltage coil 13 and the iron core 4 is provided with the inner shielding layer 15 and the outer shielding layer 16, the current passing through the power cable is larger, a magnetic field can be generated around the current, and in order to not influence other elements, the electromagnetic field can be shielded in the cable by the shielding layer, high-frequency signals from a power supply side can be attenuated by the isolation transformer, but low-frequency test voltage and low-frequency current can pass through the isolation transformer, the external signal interference is greatly reduced, and the stability and the accuracy of the partial discharge measurement of the dry-type transformer are improved.
Specifically, referring to fig. 2, the upper yoke 8 is fixedly mounted on the inner side of the upper and lower clip members 10, and the high voltage terminal 14 is fixedly mounted on the outer surface of the upper and lower clip members 10.
In this embodiment: the upper yoke 8 arranged on the upper and lower clamping pieces 10 is an optional part on the electromagnet and is used for enhancing the attraction force of the electromagnetic coil and sealing the magnetic force line generated by the electromagnetic coil inside, so that the efficiency of the electromagnet is improved, and the effects of vacuum sealing and high-voltage insulation are required to be achieved when the high-voltage terminal 14 is arranged
Specifically, referring to fig. 3, the outer surface of the outer shielding layer 16 is provided with a joint 11, and the inner side of the outer shielding layer 16 is fixedly provided with the cooling air duct 5.
In this embodiment: the outer shield 16 is used for the power cable to pass a relatively large current, a magnetic field is generated around the current, so that the electromagnetic field can be shielded in the cable by the shielding layer in order not to influence other elements, and the outer shield 16 is provided with a cooling air duct 5 for conveying cooling air to or from the part to be cooled.
Specifically, referring to fig. 2, the upper end of the base 12 is connected to a cushion block 6 through a bolt thread, and a gasket is disposed at the upper end of the cushion block 6.
In this embodiment: the cushion block 6 is fixedly arranged on the base 12 and has the function of bearing external force, the upper end of the cushion block 6 is provided with a gasket, and the gasket can be installed to better play a role of stabilizing
Specifically, referring to fig. 2, the designed magnetic flux density of the core 4 is below its saturation point, and the core 4 is mounted on the base 12.
In this embodiment: the designed value of the magnetic flux density of the iron core 4 is below the saturation point, harmonic waves and waveform distortion are prevented from being generated when a test power supply passes through the isolation transformer, and the iron core 4 is fixedly arranged on the base 12.
Specifically, referring to fig. 3, the inner shield layer 15 and the outer shield layer 16 are metal foils, and both the inner shield layer 15 and the outer shield layer 16 are grounded.
In this embodiment: the inner shielding layer 15 and the outer shielding layer 16 are metal foils, the metal foils are not easy to oxidize, the service life is long, and both the inner shielding layer 15 and the outer shielding layer 16 are grounded.
Specifically, a rubber insulating layer is laid at the inner bottom of the control box 1, and the rubber insulating layer and the control box 1 are fixed in a bonding mode.
In this embodiment: the rubber insulating layer plays insulating effect, prevents the electric leakage.
The utility model discloses a theory of operation and use flow: the input part has two windings, and the input voltage is adjusted by a matched test transformer control box 1, the input voltage is adjusted to the input line group of the test transformer, a low-voltage coil 13, the high-voltage coil 7 of the secondary line group can obtain high-voltage output with the same multiple of the turn ratio of the primary winding by utilizing the electromagnetic induction principle, the transformation ratio of the test transformer is fixed, so the high-voltage output can be continuously adjusted to the rated highest value from zero volt by using the test transformer operation box, in addition, the direct-current withstand voltage and leakage current test can be carried out by using a dry test transformer, only the alternating-current voltage of the high-voltage output needs to be rectified, the current commonly used rectifying method is an external high-voltage silicon stack, after the high-voltage silicon stacks are connected in series, the direct-current high voltage can be obtained, the control box 1 has special insulating materials which firstly has higher insulating resistance and, and can avoid accidents such as electric leakage, breakdown, etc., the upper right sidewall of the control box 1 is opened with several heat-dissipating grooves 3, the heat-dissipating grooves 3 are opened to increase the heat-dissipating area, the upper end of the heat-dissipating grooves 3 is installed with a handle 9 for better carrying, the lower end of the interior of the control box 1 is fixedly installed with a base 12, the upper end of the base 12 is fixedly connected with an iron core 4, the iron core 4 is circumferentially provided with a low-voltage coil 13 and a high-voltage coil 7 which are mutually corresponding from inside to outside, the outsides of the low-voltage coil 13 and the high-voltage coil 7 are respectively provided with an epoxy resin casting body 17, the heat resistance, the cold resistance, the wear resistance and the heat conductivity of the epoxy resin casting body 17 can also improve the hardness and the chemical corrosion resistance of the casting piece, the shrinkage factor and the thermal expansion coefficient of the casting piece can be reduced, the cost can also be reduced, the inner shielding layer 15 is arranged on the, the magnetic field can be generated around the current, so that other elements are not influenced, the electromagnetic field can be shielded in the cable by the shielding layer, high-frequency signals from the power supply side can be attenuated by the isolation transformer, low-frequency test voltage and current can pass through the isolation transformer, external signal interference is greatly reduced, and the stability and the accuracy of the partial discharge measurement of the dry-type transformer are improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A novel dry-type test transformer is characterized in that: the device comprises a control box (1) and upper and lower clamping pieces (10), wherein universal wheels (2) are fixedly mounted at four corners of the lower end of the control box (1), a plurality of radiating grooves (3) are formed in the right side wall of the upper end of the control box (1), a handle (9) is fixedly connected to the upper ends of the radiating grooves (3) through nuts, a base (12) is fixedly mounted at the lower end of the inner portion of the control box (1), an iron core (4) is fixedly connected to the upper end of the base (12), a low-voltage coil (13) and a high-voltage coil (7) which correspond to each other are arranged in the circumferential direction of the iron core (4) from inside to outside, epoxy resin pouring bodies (17) are respectively arranged on the outer sides of the low-voltage coil (13) and the high-voltage coil (7), an inner shielding layer (15) is arranged on the circumference between the low-voltage coil (13) and the high-voltage coil (7), the inner shielding layer (15) and the outer shielding layer (16) are in the shape of an opening annular cylinder, the heights of the inner shielding layer (15) and the outer shielding layer (16) are consistent with the heights of the low-voltage coil (13) and the high-voltage coil (7), and one winding of the low-voltage coil (13) and the high-voltage coil (7) is in triangular connection.
2. A novel dry test transformer as claimed in claim 1, wherein: an upper iron yoke (8) is fixedly mounted on the inner side of the upper clamping piece (10) and the lower clamping piece (10), and a high-voltage terminal (14) is fixedly mounted on the outer side surface of the upper clamping piece and the lower clamping piece (10).
3. A novel dry test transformer as claimed in claim 1, wherein: the outer side surface of the outer shielding layer (16) is provided with a joint (11), and the inner side of the outer shielding layer (16) is fixedly provided with a cooling air passage (5).
4. A novel dry test transformer as claimed in claim 1, wherein: the upper end of the base (12) is connected with a cushion block (6) through bolt threads, and a gasket is arranged at the upper end of the cushion block (6).
5. A novel dry test transformer as claimed in claim 1, wherein: the designed magnetic flux density value of the iron core (4) is below the saturation point of the iron core, and the iron core (4) is installed on the base (12).
6. A novel dry test transformer as claimed in claim 1, wherein: the inner shielding layer (15) and the outer shielding layer (16) are metal foils, and both the inner shielding layer (15) and the outer shielding layer (16) are grounded.
7. A novel dry test transformer as claimed in claim 1, wherein: a layer of rubber insulating layer is laid at the inner bottom of the control box (1), and the rubber insulating layer and the control box (1) are fixed in a bonding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022886008.6U CN213660189U (en) | 2020-12-03 | 2020-12-03 | Novel dry-type test transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022886008.6U CN213660189U (en) | 2020-12-03 | 2020-12-03 | Novel dry-type test transformer |
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| Publication Number | Publication Date |
|---|---|
| CN213660189U true CN213660189U (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022886008.6U Expired - Fee Related CN213660189U (en) | 2020-12-03 | 2020-12-03 | Novel dry-type test transformer |
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| Country | Link |
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| CN (1) | CN213660189U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825809A (en) * | 2023-02-17 | 2023-03-21 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint ground fault simulation device and evaluation method |
-
2020
- 2020-12-03 CN CN202022886008.6U patent/CN213660189U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825809A (en) * | 2023-02-17 | 2023-03-21 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint ground fault simulation device and evaluation method |
| CN115825809B (en) * | 2023-02-17 | 2023-05-16 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint ground fault simulation device and evaluation method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210709 |