A measuring device capable of precisely adjusting transformer oil gap experiment

Abstract

A measuring device capable of precisely adjusting a transformer oil gap test comprises a box body, a high-voltage plate with a tungsten-copper threaded electrode is arranged in the box body, and a measuring plate and a protective plate with a slot are arranged in the box body. A plurality of epoxy resin stays are fixedly arranged on the high-voltage plate, and a fastening ring and a gasket are arranged in the middle of the plurality of epoxy resin stays so that the edges of the test sample insulating paper fit tightly. The epoxy resin stays are placed between the high-voltage plate and the measuring plate through the slots on the protective plate, and the test sample insulating paper is fixed on the measuring plate. A protective plate bottom column and a measuring plate support are arranged below the measuring plate and the protective plate, and the protective plate support with grooves and the measuring plate support with grooves are respectively connected to the protective plate lead-out terminal column and the measuring electrode lead-out terminal column through wires. The present invention provides a measuring device capable of precisely adjusting a transformer oil gap test, and the device has the characteristics of being easy to use, capable of precise adjustment, accurate determination of transformer oil gap test parameters, and being easy to disassemble and clean.

Description

Technical Field

[0001] The invention relates to the technical field of high voltage insulation, and in particular to a measuring device capable of precisely adjusting a transformer oil gap experiment. Background Art

[0002] my country's power industry is in a rapid development stage. With the development of ultra-high voltage transmission technology in my country, oil-immersed transformers have become one of the most important equipment in the power grid. If a transformer fails, it will affect the normal operation of the entire power grid, and may even cause the collapse of the power grid, causing serious economic losses or personal safety to the country, enterprises, and residential users. Most of the damage and failures of oil-immersed transformers are caused by the aging of the insulation system. As the transformer's operating life increases, it will be affected by factors such as temperature, moisture, and machinery, and aging products such as CO, CO2, and furfural will be produced inside, which will cause the insulation strength of the transformer to decrease. Therefore, it is very important to accurately diagnose the state of transformer oil-paper insulation. The internal insulation structure of the transformer is mainly composed of insulating oil, insulating paper, and oil gap. The oil gap is the thickness of the insulating oil between the insulating paper layer and the high-voltage insulating winding. Therefore, when conducting transformer simulation experiments, it is necessary to consider the influence of the oil gap, and the experiment is carried out by simulating the oil gap in the device.

[0003] In order to accurately diagnose the transformer oil-paper insulation status, a three-electrode device is required to perform the corresponding dielectric response test. The three electrodes are composed of a high-voltage electrode, a measuring electrode and a protective electrode, where the protective electrode is used to shield the surface current of the test piece. In previous three-electrode test experiments, the operation was complicated. During the measurement, the edges of the test piece's insulation paper could not fit tightly, resulting in bubbles between the papers and causing errors; during oil filling and placing high-voltage plates, the test piece slipped between the papers, offsetting the measuring plates and causing errors; it was difficult to conduct oil gap simulation experiments and the oil gap data was inconvenient to read, resulting in large errors; the operation was very cumbersome and difficult to operate during the oil change experiment. Summary of the invention

[0004] Considering the shortcomings and deficiencies of the existing transformer oil-paper characteristic test device, such as the complicated operation, the inability of the edges of the test paper to fit tightly during measurement, resulting in bubbles between the papers, the sliding of the test paper during oil filling and placement of the high-voltage plate, and the offset of the measuring plate, the difficulty in conducting the oil gap simulation experiment and the inconvenience of reading the oil gap data, the overly cumbersome operation of the oil change experiment, and the large experimental error, the present invention provides a measuring device capable of precisely adjusting the transformer oil gap experiment, which is easy to use, can be precisely adjusted, can accurately measure the transformer oil gap experiment parameters, is easy to disassemble and is easy to clean.

[0005] The technical solution adopted by the present invention is:

[0006] A measuring device capable of precisely adjusting the oil gap test of a transformer comprises a box body, a high voltage plate with a tungsten copper threaded electrode is arranged in the box body, a measuring plate and a protective plate with a slot are arranged in the box body. A plurality of epoxy resin stays are fixedly arranged on the high voltage plate, and a fastening ring and a gasket are arranged in the middle of the plurality of epoxy resin stays so that the edges of the test sample insulating paper fit closely. The epoxy resin stays are placed between the high voltage plate and the measuring plate through the slot on the protective plate, and the test sample insulating paper is fixed on the measuring plate.

[0007] A protective plate bottom column and a measuring plate support are provided below the measuring plate and the protective plate. The protective plate support with grooves and the measuring plate support with grooves are respectively connected to the protective plate lead-out terminal column and the measuring electrode lead-out terminal column through wires.

[0008] The protection plate lead-out terminal column and the tungsten-copper threaded electrode are fixed on the box cover of the box body through nuts and gaskets.

[0009] A round oil nozzle is provided at the bottom of the box body and is sealed by an oil plug.

[0010] The high-voltage plate is connected to a tungsten-copper threaded electrode, the front end of the pole of the tungsten-copper threaded electrode is designed with a thread, and the middle and rear ends are finely polished and smooth.

[0011] The high voltage pole plate is provided with three epoxy resin stays printed with micrometer scales, and the epoxy resin stays are fixed to the high voltage pole plate through fastening rings at the upper ends thereof.

[0012] The fastening ring is a circular open metal strip with holes, and the size of the opening is controlled by tightening bolts, so as to achieve the function of fastening the epoxy resin stay.

[0013] The bottom column of the protection plate and the middle section of the measuring plate support are provided with grooves.

[0014] The box body is a cylindrical acrylic box.

[0015] The oil plug is made of TPEE material.

[0016] The invention discloses a measuring device capable of precisely adjusting the transformer oil gap experiment. The device can directly read and precisely adjust the thickness of the test piece insulation paper and the oil gap, and accurately measures the transformer oil gap experiment result. The edges of the test piece insulation paper can be closely fitted, and bubbles mixed in the edges of the test piece paper in the existing experimental device are eliminated. The slippage between the test piece papers caused by the existing instrument during oil filling and placing of high-voltage plates is avoided. A support with a groove is provided under the measuring plate and the protective plate, and the winding and tightening of the wire is convenient. The oil nozzle at the bottom of the measuring device box can perform oil change processing on the test piece, and the oil change and oil filtering experiment is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the structure of the device of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the fastening ring and the tightening bolt of the device of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1 , Figure 2 As shown, a measuring device capable of precisely adjusting the transformer oil gap experiment comprises a box body 5 in which a high voltage plate with a tungsten copper threaded electrode 3 is arranged, and a measuring plate 13 and a protective plate 14 with a slot are arranged in the box body 5.

[0020] The high voltage plate is fixed with a plurality of epoxy resin stays 7, and a fastening ring and a gasket 8 are arranged in the middle of the plurality of epoxy resin stays 7 to make the edges of the test sample insulating paper fit closely. The epoxy resin stays 7 have good dielectric properties and high hardness and can stably support the high voltage plate.

[0021] The epoxy resin stay 7 is passed through the slot on the protection plate 14 and placed between the high voltage plate and the measuring plate 13 , and the test sample insulating paper is fixed on the measuring plate 13 .

[0022] A protective plate bottom column 11 and a measuring plate support 12 are provided below the measuring plate 13 and the protective plate 14. The protective plate support 11 with grooves and the measuring plate support 12 with grooves are respectively connected to the protective plate lead-out terminal column 15 and the measuring electrode lead-out terminal column 1 through wires.

[0023] The protection plate lead-out terminal 15 and the tungsten-copper threaded electrode 3 are fixed to the box cover of the box body 5 through the nut 4 and the gasket 2 .

[0024] A round oil nozzle 10 is provided at the bottom of the box body 5 and is sealed by an oil plug 18 .

[0025] The high-voltage plate is connected to the tungsten-copper threaded electrode 3. The front end of the pole of the tungsten-copper threaded electrode 3 is designed with a thread, and the middle and rear ends are finely polished and smooth, so that the voltage can be better connected.

[0026] The high voltage pole plate is provided with three epoxy resin stays 7 printed with micrometer scales, and the epoxy resin stays 7 are fixed to the high voltage pole plate through the fastening rings 6 at the upper ends thereof.

[0027] The fastening ring 6 is a circular open metal strip with holes, and the size of the opening is controlled by tightening bolts 19 to achieve the function of fastening the epoxy resin stay 7.

[0028] The middle sections of the protective plate bottom column 11 and the measuring plate support column 12 are provided with grooves, which can make the connecting wires more firmly wound.

[0029] The box body 5 is a cylindrical acrylic box.

[0030] The oil plug 18 is made of TPEE material, which is an elastic plastic with a heat resistance temperature of 150 degrees. TPEE has excellent oil resistance and can withstand most polar liquid chemical media at room temperature.

[0031] When the wire is wound around the electrode lead-out end, it is fixed and compressed by two tightening nuts 4 so that the wire can be tightly connected to the protection electrode 14, the measuring electrode 13 and the corresponding protection electrode lead-out terminal 15 and the measuring electrode lead-out terminal 1.

[0032] When conducting the oil gap experiment, first remove the gasket 2 and the nut 4 on the tungsten copper threaded electrode 3, take out the high-voltage plate, and place the test insulating paper on the measuring plate 13, then put the high-voltage plate into the box 5, adjust the height of the epoxy resin stays 7 on the high-voltage plate by the fastening ring 6 and the bolt, and press the test insulating paper so that it is just located between the three epoxy resin stays 7. At this time, the oil gap and the thickness of the insulating paper can be read according to the scale on the epoxy resin stay 7; use a wire to connect the measuring plate support 12 at the bottom of the measuring plate 13 and the protective plate 14, and the protective plate bottom column 11 to the measuring electrode lead-out terminal column 1 and the protective plate lead-out terminal column 15 respectively; inject the test sample insulating oil, fix the plate lead-out terminal column and the tungsten copper threaded electrode 3 on the acrylic box cover by tightening the nut 4, and close the acrylic box cover before the corresponding transformer oil-paper insulation oil gap simulation test can be carried out.

[0033] When conducting a general three-electrode experiment, first remove the gasket 2 and nut 4 on the tungsten copper threaded electrode 3, take out the high-voltage plate, and place the sample insulating paper on the measuring plate 13, remove the fastening ring and gasket 8 on the epoxy resin support bar 7 between the high-voltage plate and the measuring plate 13, and then put the high-voltage plate into the box, adjust the height of the high-voltage plate through the fastening ring 6 at the upper end of the epoxy resin support bar 7, and make the edge of the sample fit tightly; use a wire to connect the measuring plate support 12 at the bottom of the measuring plate 13 and the protective plate 14, and the protective plate bottom column 11 to the corresponding measuring electrode lead-out terminal column 1 and the protective plate lead-out terminal column 15 respectively; inject the test sample insulating oil, fix the plate lead-out terminal column and the tungsten copper threaded electrode 3 on the acrylic box cover by tightening the nut 4, and close the acrylic box cover before the corresponding transformer oil-paper insulation oil gap simulation test can be carried out.

[0034] When conducting the oil change test, first open the oil plug 18 at the bottom of the box to allow the insulating oil to flow out, then close the oil plug 18 and inject new oil. The operation of the three-electrode plate is consistent with the general three-electrode experiment mentioned above, and then the corresponding three-electrode oil change simulation test can be carried out.

Claims

1. A measuring device capable of precisely adjusting a transformer oil gap test, comprising a housing (5), characterized in that: A high-voltage plate with a tungsten-copper threaded electrode (3) is arranged in the box (5), and a measuring plate (13) and a protective plate (14) with a slot are arranged in the box (5); a plurality of epoxy resin stays (7) are fixedly arranged on the high-voltage plate, and a fastening ring and a first gasket (8) are arranged in the middle of the plurality of epoxy resin stays (7) so that the edges of the test sample insulation paper are closely fitted; the epoxy resin stays (7) are placed between the high-voltage plate and the measuring plate (13) through the slots on the protective plate (14), and the test sample insulation paper is fixed on the measuring plate (13); a measuring plate support (12) and a protective plate bottom column (11) are respectively arranged below the measuring plate (13) and the protective plate (14), and the protective plate bottom column (11) and the measuring plate support (12) are respectively connected to the protective plate lead-out terminal column (15) and the measuring electrode lead-out terminal column (1) through wires; The high-voltage electrode plate is connected to a tungsten-copper threaded electrode (3), the front end of the pole of the tungsten-copper threaded electrode (3) is threaded, and the middle and rear ends are finely polished and smooth; The high-voltage pole plate is provided with three epoxy resin stays (7) printed with micrometer scales, and the epoxy resin stays (7) are fixed to the high-voltage pole plate via fastening rings (6) at their upper ends; The fastening ring (6) is a circular open metal strip with holes, and the size of the opening is controlled by tightening the bolts (19), thereby achieving the function of fastening the epoxy resin stay (7); When the wire is wound around the electrode lead-out end, it is fixed and compressed by two tightening nuts (4), so that the wire can be tightly connected to the protection electrode (14), the measuring electrode (13) and the corresponding protection electrode lead-out terminal column (15) and the measuring electrode lead-out terminal column (1).

2. A measuring device capable of precisely adjusting transformer oil gap test according to claim 1, characterized in that: The protection plate lead-out terminal post (15) and the tungsten-copper threaded electrode (3) are fixed to the box cover of the box body (5) via a nut (4) and a second gasket (2).

3. A measuring device capable of precisely adjusting transformer oil gap test according to claim 1, characterized in that: The bottom of the box body (5) is provided with a round oil nozzle (10) which is sealed by an oil plug (18).

4. An oil gap test method using a measuring device capable of precisely adjusting transformer oil gap test as claimed in any one of claims 1 to 3, characterized in that: First, remove the second gasket (2) and nut (4) on the tungsten copper threaded electrode (3), take out the high-voltage electrode, and place the test sample insulation paper on the measuring electrode (13). Then put the high-voltage electrode into the box (5). Adjust the height of the epoxy resin support (7) on the high-voltage electrode by means of the fastening ring (6) and the bolts, and press the test sample insulation paper so that it is just located between the three epoxy resin support bars (7). At this time, the oil gap and the oil gap can be read according to the scale on the epoxy resin support bar (7). The thickness of the insulating paper; using a wire to connect the measuring electrode support (12) and the protective electrode bottom column (11) at the bottom of the measuring electrode (13) and the protective electrode (14) to the measuring electrode lead-out terminal column (1) and the protective electrode lead-out terminal column (15) respectively; injecting the test sample insulating oil, by tightening the nut (4), the electrode lead-out terminal column and the tungsten copper threaded electrode (3) are fixed to the box cover, and the box cover is closed before the corresponding transformer oil-paper insulation oil gap simulation test can be carried out.

5. An oil change test method using a measuring device capable of precisely adjusting the transformer oil gap test as claimed in any one of claims 1 to 3, characterized in that: First open the oil plug (18) at the bottom of the box to allow the insulating oil to flow out, then close the oil plug (18) and inject new oil.

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