CN113504296A - Device for measuring surface flashover voltage and partial discharge signal of insulating paper board - Google Patents

Abstract

The invention discloses a device and method for measuring the creepage flashover voltage and partial discharge signal of insulating paperboard. The device comprises: a high-voltage electrode and a measuring electrode are located in a test box. The test product is connected, and the measuring electrode is connected with the insulating cardboard sample to be tested and the signal measuring device respectively; the test box is filled with oil and insulating oil; the high voltage power supply is used to apply high voltage between the high voltage electrode and the measuring electrode, and the signal measuring device is used for the insulation to be tested. The surface flashover voltage and partial discharge signal of the cardboard samples were measured. By creating a slightly uneven electric field environment, the invention can accurately measure the surface flashover voltage and partial discharge signal of the insulating paperboard, the test environment is more suitable for the actual operating conditions of the transformer, and the test results can accurately reflect the actual operation of the transformer insulating paperboard. Operating performance can be used to identify the pros and cons of insulating materials and verify the operating performance of insulating materials.

Description

Device for measuring creeping flashover voltage and partial discharge signal of insulating paperboard

technical field

The present invention relates to the technical field of discharge characteristic testing, and more particularly, to a device and method for measuring the creepage flashover voltage and partial discharge signal of insulating paperboard.

Background technique

The transformer insulation system is composed of cardboard + oil channel, and the electric field it withstands is mainly the field strength in the oil and the field strength along the surface of the cardboard. The partial discharge characteristics along the surface are an important indicator to characterize the excellent electrical performance of the cardboard insulation. Significant reference significance, but lack of corresponding test standards.

The creeping discharge of oil-paper insulation has high requirements on the design of the measuring device: if the electrode size is not set properly, the initial partial discharge will occur in the wedge-shaped oil gap at the edge of the electrode, not the surface of the insulating cardboard, so the creeping discharge characteristics of the insulating cardboard cannot be verified. In addition, if the electrode is fixed on the surface of the material to be tested, due to the rough fibers on the surface of the material, the electrode and the cardboard may not be in complete contact, and there is an oil gap, and partial discharge occurs in the oil gap before the surface of the insulating cardboard. Therefore, its test device design, measurement method, and measurement technology have a significant impact on the measurement results.

SUMMARY OF THE INVENTION

The invention provides a device and method for measuring the creepage flashover voltage and partial discharge signal of insulating paperboard, so as to solve the problem of how to accurately measure the creepage flashover voltage and partial discharge signal of insulating paperboard.

In order to solve the above problems, according to an aspect of the present invention, there is provided a device for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard, the device includes: a test box, a high-voltage electrode and a measuring electrode; wherein,

The high-voltage electrode and the measuring electrode are located in the test box, the high-voltage electrode is respectively connected with the high-voltage power supply and the insulating cardboard sample to be tested, and the measuring electrode is respectively connected with the insulating cardboard sample to be tested and the signal measuring device The body of the test box is filled with insulating oil; the high-voltage power supply is used to apply a high voltage between the high-voltage electrode and the measuring electrode, and the surface flashover voltage and partial discharge signal of the insulating cardboard sample to be tested are carried out by the signal measuring device. Measurement.

Preferably, the device further comprises: a first electrode support rod for supporting the high-voltage electrode and a second electrode support rod for supporting the measurement electrode; wherein,

One end of the first electrode support rod is connected to the high-voltage electrode, and the other end extends to the outside of the test box and is connected to the high-voltage power supply through a first lead;

One end of the second electrode support rod is connected to the measurement electrode, and the other end extends to the outside of the test box and is connected to the signal measurement device through a second lead.

Preferably, the device further comprises: a first helical macro adjustment structure disposed at the other end of the first electrode support rod and a second helical macro adjustment structure disposed at the other end of the second electrode support rod structure; the distance between the high-voltage electrode and the measuring electrode is adjusted through the first helical macro-adjustment structure and the second helical macro-adjustment structure.

Preferably, the device further comprises: a pressure-equalizing shielding cover disposed on the outer sidewall of the test box; and the first helical macro-pitch adjusting structure is disposed in the pressure-equalizing shielding cover.

Preferably, the first lead wire is connected to the high-voltage power supply through a connecting copper bar, and the first lead wire is sealed by a flange, so as to insulate the first lead wire from the test box.

Preferably, the device further comprises: a support assembly placed in the test box and fixed at the bottom of the sample box; the insulating cardboard sample to be tested, the high-voltage electrode and the measurement electrode are placed on the support assembly .

Preferably, the device further comprises: an oil inlet and an oil outlet opened on the side wall of the test box, and the oil filtering device can filter the inside of the test box through the oil inlet and the oil outlet. Filled with insulating oil for filtration.

Preferably, the device further comprises: a breathing port opened on the top of the test box, through which the test box is evacuated.

Preferably, the device further comprises: at least one adjusting block placed under the insulating paperboard sample to be tested, and the adjusting block is used to adjust the height of the insulating paperboard sample to be tested.

According to another aspect of the present invention, there is provided a method for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard by using the above-mentioned device for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard, said Methods include:

Filter the insulating oil filled in the test box, and put the test box in a vacuum state after the filter treatment;

Apply high voltage between the high voltage electrode and the measuring electrode by using a high voltage power supply;

A signal measuring device is used to measure the creepage flashover voltage and partial discharge signal of the insulating paperboard to be tested.

The invention provides a device and method for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard. By creating a slightly uneven electric field environment, the creeping flashover voltage and partial discharge signal of insulating paperboard can be accurately measured. , the test environment is more suitable for the actual operating conditions of the transformer, and the test results can accurately reflect the actual operating performance of the transformer insulating board, which can be used to identify the pros and cons of insulating materials and verify the operating performance of insulating materials.

Description of drawings

Exemplary embodiments of the present invention may be more fully understood by reference to the following drawings:

FIG. 1 is a schematic structural diagram of a device 100 for measuring creeping flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention;

2 is an exemplary diagram of a device for measuring the creepage flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention;

3 is a flow chart of measuring the creeping flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention;

4 is a flowchart of a method 400 for measuring creepage flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention.

Among them, 1 is the first helical macro adjustment structure, 2 is the pressure equalizing cover, 3 is the first electrode support rod, 4 is the oil inlet, 5 is the measuring electrode, 6 is the test sample table, 7 is the test sample table bracket, 8 is the base of the test sample table, 9 is the oil outlet, 10 is the test box, 11 is the breathing port, 12 is the high voltage electrode, 13 is the second electrode support rod, and 14 is the second spiral macro adjustment structure.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

FIG. 1 is a schematic structural diagram of an apparatus 100 for measuring creeping flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention. As shown in FIG. 1 , the device for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard provided by the embodiment of the present invention can accurately measure the creeping flashover voltage and local discharge signal of insulating paperboard by creating a slightly uneven electric field environment. The discharge signal is measured, and the test environment is more suitable for the actual operating conditions of the transformer. The test results can accurately reflect the actual operating performance of the transformer insulating board, which can be used to identify the pros and cons of insulating materials and verify the operating performance of insulating materials. The device 100 for measuring the creeping flashover voltage and partial discharge signal of an insulating paperboard provided by the embodiment of the present invention includes: a test box 101 , a high-voltage electrode 102 and a measuring electrode 103 .

Wherein, the high-voltage electrode 102 and the measuring electrode 103 are located in the test box 101, the high-voltage electrode is respectively connected with the high-voltage power supply and the insulating cardboard sample to be tested, and the measuring electrode is respectively connected with the insulating cardboard sample to be tested. Connect with a signal measuring device; the test box is filled with insulating oil; use the high-voltage power supply to apply a high voltage between the high-voltage electrode and the measuring electrode, and use the signal measuring device to test the surface flashover of the insulating cardboard sample. Voltage and partial discharge signals are measured.

2, in the present invention, the high-voltage power supply (not shown in the figure) is connected to the high-voltage electrode 12, the measurement electrode 5 is connected to the signal measurement device (not shown in the figure), and the insulation to be measured is connected. The cardboard sample is placed between the high-voltage electrode 12 and the measuring electrode 5, and a high voltage is applied between the high-voltage electrode 12 and the measuring electrode 5 by using a high-voltage power supply, and the surface flashover of the insulating cardboard sample to be tested is carried out by using the signal measuring device. Voltage and partial discharge signals are measured.

The high-voltage electrode of the present invention can be connected to a power frequency test power supply, and the low-voltage electrode can be connected to a partial discharge tester through measuring impedance to measure and extract partial discharge signals.

Preferably, the device further comprises: a first electrode support rod for supporting the high-voltage electrode and a second electrode support rod for supporting the measurement electrode; wherein,

One end of the first electrode support rod is connected to the high-voltage electrode, and the other end extends to the outside of the test box and is connected to the high-voltage power supply through a first lead;

One end of the second electrode support rod is connected to the measurement electrode, and the other end extends to the outside of the test box and is connected to the signal measurement device through a second lead.

Preferably, the device further comprises: a first helical macro adjustment structure disposed at the other end of the first electrode support rod and a second helical macro adjustment structure disposed at the other end of the second electrode support rod structure; the distance between the high-voltage electrode and the measuring electrode is adjusted through the first helical macro-adjustment structure and the second helical macro-adjustment structure.

Preferably, the device further comprises: a pressure-equalizing shielding cover disposed on the outer sidewall of the test box; and the first helical macro-pitch adjusting structure is disposed in the pressure-equalizing shielding cover.

Preferably, the first lead wire is connected to the high-voltage power supply through a connecting copper bar, and the first lead wire is sealed by a flange, so as to insulate the first lead wire from the test box.

2, in the present invention, the measuring electrode 5 is connected with the second electrode support rod 13, the second electrode support rod 13 extends to the outside of the test box 10, and the second electrode support rod 13 is connected to the test tank. The external outlet is connected, and the second electrode support rod 13 is also connected with the second helical macro adjustment structure 14 .

The high-voltage electrode 12 is connected with the first electrode support rod 3, the first electrode support rod 3 extends to the outside of the test box body 10, and the first electrode support rod 3 is connected with the external outlet (not shown in the figure) located in the test oil tank, The first electrode support rod 3 is also connected with the first helical macro-adjustment structure 1 , and a voltage equalization shield 2 is arranged outside the first helical macro-adjustment structure 1 .

In addition, the lead wire (not shown in the figure) of the high-voltage electrode terminal can be connected to the test transformer through the connecting copper bar, sealed through the flange, and the lead wire and the box body can be insulated. The other end of the first electrode support rod 3 can perform helical macro adjustment through the first helical macro adjustment structure 1 , and the other end of the second electrode support rod 13 can perform helical macro adjustment through the second helical macro adjustment structure 14 .

The measuring electrodes of the present invention can be further replaced with electrodes of different shapes according to the size of the sample to be tested and the electric field strength to be simulated.

Preferably, the device further comprises: a support assembly placed in the test box and fixed at the bottom of the sample box; the insulating cardboard sample to be tested, the high-voltage electrode and the measurement electrode are placed on the support assembly .

Preferably, the device further comprises: an oil inlet and an oil outlet opened on the side wall of the test box, and the oil filtering device can filter the inside of the test box through the oil inlet and the oil outlet. Filled with insulating oil for filtration.

Preferably, the device further comprises: a breathing port opened on the top of the test box, through which the test box is evacuated.

Preferably, the device further comprises: at least one adjusting block placed under the insulating paperboard sample to be tested, and the adjusting block is used to adjust the height of the insulating paperboard sample to be tested.

With reference to Figure 2, in the present invention, the oil inlet 4 is located at the upper part of the side wall of the test oil tank, and is used to perform oil filling operation on the test oil tank; The product is extracted and tested, or the whole oil is drained. The support component of the test product is also fixed to the bottom of the test box through the spiral distance adjustment structure, including: the test product table bracket 7, which connects the test product table 6 and the bottom of the test oil tank, and is used to support the insulating cardboard sample to be tested and the box body. The test sample table is fixed by the screw distance adjusting device, which can realize the close fit between the insulating cardboard sample to be tested and the measuring electrode. The test box 10 exchanges pressure with the outside through the breathing port 11 .

In addition, the present invention can also add adjusting pads (not shown in the figure) according to the size of the sample and the distance along the surface to adapt to different test conditions.

As shown in FIG. 2 and FIG. 3 , in the present invention, the test box 10 is connected to an external partial discharge test circuit high-voltage power supply and a signal measurement device for partial discharge signal acquisition. Both the test box 10 and the insulating cardboard sample to be tested should be oil-filtered and vacuumed before the test. During the measurement, the insulating cardboard sample is assembled on the sample table 6, and then the high-voltage electrode 12 is pressurized, shielded by the pressure equalizing cover 2, and monitored by a digital partial discharge tester , data access, analysis and processing.

The invention discloses an insulating cardboard creepage flashover voltage and partial discharge signal measuring device and a testing method thereof, comprising: a test oil tank and a measuring electrode, wherein the test oil tank includes: an oil filling port, which is located on the side wall of the test device and is used for Fill the test oil tank with oil; the measuring electrode is connected to the external outlet located in the test oil tank through the lead wire for applying external voltage to the test object, and the lead wire is sealed through the flange and extends to the outside of the test box body. In the present invention, a slightly uneven electric field environment can be created to make the test environment more suitable for the actual operating conditions of the transformer, avoid the influence of the oil gap on the edge of the electrode on the discharge test results in the flashover voltage test along the surface, and can realize the test results. conditions and creepage distance.

Compared with the prior art, the beneficial effect of the present invention is: for the partial discharge test of insulating paperboard, since there is no standard to follow, in order to make the insulating paperboard discharge under low voltage, it is not necessary to apply a high electric field during the test process, which is convenient for testing. For testing and recording, the tester usually uses needle-plate electrodes. However, in the actual operation of insulating cardboard in transformers, there is no extremely uneven electric field condition similar to needle-plate electrodes, and the test conditions are disconnected from the operating conditions, which cannot accurately reflect the partial discharge characteristics of the material. Using the method shown in this patent can create a slightly uneven electric field environment, the test environment is more suitable for the actual operating conditions of the transformer, and the test results more accurately reflect the actual operating performance of the transformer insulating board.

4 is a flowchart of a method 400 for measuring creepage flashover voltage and partial discharge signal of insulating paperboard according to an embodiment of the present invention. As shown in FIG. 4 , a method 400 for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard using the above-mentioned apparatus for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard provided by the embodiment of the present invention, from Beginning at step 401, in step 401, the insulating oil filled in the test box is filtered, and the test box is in a vacuum state after the filter process.

In step 402, a high voltage is applied between the high voltage electrode and the measurement electrode using a high voltage power supply.

In step 403, the creeping flashover voltage and partial discharge signal of the insulating paperboard sample to be tested are measured by a signal measuring device.

The method 400 for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard according to the embodiment of the present invention is similar to the apparatus 100 for measuring the creeping flashover voltage and partial discharge signal of insulating paperboard according to another embodiment of the present invention Correspondingly, details are not repeated here.

The present invention has been described with reference to a few embodiments. However, as is known to those skilled in the art, other embodiments than the above disclosed invention are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/the/the [means, component, etc.]" are open to interpretation as at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications or equivalent replacements are made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (9)

1. An apparatus for measuring a surface flashover voltage and a partial discharge signal of an insulating paper sheet, the apparatus comprising: the device comprises a test box body, a high-voltage electrode and a measuring electrode; wherein,

the high-voltage electrode and the measuring electrode are positioned in the test box body, the high-voltage electrode is respectively connected with a high-voltage power supply and an insulating paperboard sample to be measured, and the measuring electrode is respectively connected with the insulating paperboard sample to be measured and a signal measuring device; the test chamber body is filled with insulating oil; and applying high voltage between the high-voltage electrode and the measuring electrode by using the high-voltage power supply, and measuring the surface flashover voltage and the local discharge signal of the insulating paperboard sample to be measured by using the signal measuring device.

2. The apparatus of claim 1, further comprising: a first electrode supporting rod for supporting the high voltage electrode and a second electrode supporting rod for supporting the measuring electrode; wherein,

one end of the first electrode supporting rod is connected with the high-voltage electrode, and the other end of the first electrode supporting rod extends to the outside of the test box body and is connected with the high-voltage power supply through a first lead;

one end of the second electrode supporting rod is connected with the measuring electrode, and the other end of the second electrode supporting rod extends to the outside of the test box body and is connected with the signal measuring device through a second lead.

3. The apparatus of claim 2, further comprising: the first spiral micro-distance adjusting structure is arranged at the other end of the first electrode supporting rod, and the second spiral micro-distance adjusting structure is arranged at the other end of the second electrode supporting rod; and the distance between the high-voltage electrode and the measuring electrode is adjusted through a first spiral micro-distance adjusting structure and a second spiral micro-distance adjusting structure.

4. The apparatus of claim 3, further comprising: the voltage-sharing shielding cover is arranged on the outer side wall of the test box body; the first spiral micro-distance adjusting structure is arranged in the voltage-sharing shielding cover.

5. The apparatus of claim 2, wherein the first lead is connected to the high voltage power supply by a connecting copper bar and sealed by a flange to insulate the first lead from the test chamber.

6. The apparatus of claim 1, further comprising: the supporting component is arranged in the test box body and fixed at the bottom of the sample box body; the insulating paperboard sample to be measured, the high-voltage electrode and the measuring electrode are arranged on the supporting component.

7. The apparatus of claim 1, further comprising: the oil filter device is used for filtering the insulating oil filled in the test box body through the oil inlet and the oil outlet.

8. The apparatus of claim 1, further comprising: and the adjusting cushion block is arranged below the insulating paperboard sample to be detected and is used for adjusting the height of the insulating paperboard sample to be detected.

9. A method for measuring a surface flashover voltage and a partial discharge signal of an insulation paperboard using the apparatus for measuring a surface flashover voltage and a partial discharge signal of an insulation paperboard as set forth in any one of the above 1 to 8, the method comprising:

filtering the insulating oil filled in the test box body, and keeping the test box body in a vacuum state after the filtering;

applying high voltage between the high-voltage electrode and the measuring electrode by using a high-voltage power supply;

and measuring the surface flashover voltage and the local discharge signal of the insulating paperboard sample to be measured by using a signal measuring device.

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