1. A method for simulating the damp defect of an epoxy glue impregnated paper sleeve is characterized by comprising the following steps:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample;

coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; and

and carrying out moisture invasion processing on the radial invasion damped sample and the axial invasion damped sample.

2. The method for simulating the moisture defect of the epoxy glue impregnated paper bushing as claimed in claim 1, further comprising the steps of:

and testing the water content of the radial invasion damped sample and the axial invasion damped sample which are subjected to the water invasion treatment.

3. The method for simulating the moisture defect of the epoxy impregnated paper bushing as claimed in claim 2, wherein the moisture content test comprises the steps of:

respectively drying the radial invasion damped sample and the axial invasion damped sample subjected to the moisture invasion treatment;

according to carrying out radial invasion sample and the axial invasion sample that wets after the moisture invasion is handled is in before and after the drying weight change, obtain radial invasion sample's that wets moisture content with the moisture content of the axial invasion sample that wets.

4. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing as claimed in claim 3, wherein the moisture content K1 of the radial-direction invasion moisture-affected test specimen and the moisture content K2 of the axial-direction invasion moisture-affected test specimen are obtained by the following formulas:

wherein G1 is the weight of the radial invasion damped sample before drying, and Δ G1 is the weight difference between the radial invasion damped sample before drying and after drying; g2 is the weight before drying of the axially wetted specimen and Δ G2 is the difference between the weight before and after drying of the axially wetted specimen.

5. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing according to claim 4, wherein the moisture-affected position of the epoxy glue impregnated paper bushing is determined according to the moisture content K1 of the radial invasion moisture-affected test sample and the moisture content K2 of the axial invasion moisture-affected test sample.

6. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing as claimed in claim 5,

if the moisture content K1 of the radial invasion damped sample is more than or equal to 0.01 percent and the moisture content K2 of the axial invasion damped sample is less than 0.01 percent, the side wall of the epoxy glue impregnated paper sleeve is damped;

if the moisture content K1 of the radial invasion damped sample is less than 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the two end faces of the epoxy glue impregnated paper sleeve are damped;

and if the moisture content K1 of the radial invasion damped sample is more than or equal to 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the epoxy glue impregnated paper sleeve is damped integrally.

7. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing as claimed in claim 6, wherein after the step of determining the moisture-affected position of the epoxy glue impregnated paper bushing, the method further comprises the steps of: and determining the moisture degree of the epoxy glue impregnated paper sleeve according to the moisture content K1 of the radial invasion moisture sample and the moisture content K2 of the axial invasion moisture sample.

8. The method for simulating the moisture-affected defect of the epoxy glue-impregnated paper bushing according to claim 7, wherein the side wall of the epoxy glue-impregnated paper bushing is affected with moisture, and the moisture content of the radially-invasive moisture-affected test sample is used for determining the moisture-affected degree of the epoxy glue-impregnated paper bushing; the two end faces of the epoxy glue impregnated paper sleeve are damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined according to the moisture content of the axially invaded damped sample; the epoxy glue impregnated paper sleeve is wholly damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined by using the damping sample with higher moisture content in the radial invasion damping sample and the axial invasion damping sample;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.01% -0.05%, the epoxy glue impregnated paper sleeve is slightly damped;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.05% -0.1%, the epoxy glue impregnated paper sleeve is moderately damped;

and if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is more than 0.1%, the epoxy glue impregnated paper sleeve is heavily damped.

9. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing as claimed in any one of claims 1 to 8, wherein the material of the water-resistant layer is moisture-resistant insulating paint or silicone rubber.

10. The method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing as claimed in any one of claims 1 to 8, wherein the thickness of the water-blocking layer is 0.5mm to 2 mm.

11. The method for simulating the damp defect of the epoxy glue impregnated paper bushing as claimed in any one of claims 1 to 8, wherein the temperature of the moisture invasion treatment is 1 ℃ to 120 ℃.

12. The method for simulating the damp defect of the epoxy glue impregnated paper bushing according to any one of claims 1 to 8, wherein the bushing sample, the radial invasion damp sample after the moisture invasion treatment and the axial invasion damp sample are subjected to an insulation performance test.

13. The preparation method of the damp sample of the epoxy glue impregnated paper sleeve is characterized by comprising the following steps of:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample; and

and coating a water-resistant layer on the side wall of the other sleeve sample, and not coating the two end faces of the other sleeve sample to prepare an axial invasion damped sample.

Background

The high-voltage bushing is a device for one or more conductors to pass through a partition such as a wall or a box body and the like to play roles of insulation and support, and is mainly used for leading in or leading out full voltage and full current by passing current-carrying conductors through a metal box body or a valve hall wall body of equipment with different potentials from the current-carrying conductors in power transmission and transformation engineering so as to play roles of insulation and mechanical support. The high-voltage bushing has extremely harsh operating conditions, integrates current, heat, force, environment and other factors, and is comprehensively influenced by various aspects such as voltage, current, tension, vibration, wind power, atmospheric pollution and the like. However, the operational reliability of the high-voltage bushing is directly related to the operational safety of the large power grid, and is one of the key devices for ensuring the safe and stable operation of the power system.

The epoxy resin impregnated paper capacitor type bushing (epoxy resin impregnated paper bushing for short), also called dry bushing, is a high voltage bushing using cured epoxy resin impregnated insulating paper as main insulation, and is widely applied to power grid construction by the characteristics of excellent and stable electrical performance, explosion prevention, flame retardation, small volume, light weight and the like. At present, the epoxy glue impregnated paper condenser type sleeve is mainly used for a converter transformer valve side sleeve and a direct current wall bushing. In actual engineering, the epoxy glue impregnated paper sleeve often suffers from the phenomenon of being wetted, which threatens the safe operation of a power system.

Disclosure of Invention

Based on the method, the damp defect simulation method of the epoxy glue impregnated paper sleeve can effectively simulate damp defects and is convenient for troubleshooting and maintenance more efficiently.

The technical scheme of the invention for solving the technical problems is as follows.

A method for simulating moisture defects of an epoxy glue impregnated paper sleeve comprises the following steps:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample;

coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; and

and carrying out moisture invasion processing on the radial invasion damped sample and the axial invasion damped sample. In some embodiments, the method for simulating the moisture defect of the epoxy glue impregnated paper bushing further comprises the following steps:

and testing the water content of the radial invasion damped sample and the axial invasion damped sample which are subjected to the water invasion treatment.

In some embodiments, in the method for simulating moisture defects of the epoxy impregnated paper bushing, the moisture content test comprises the following steps:

respectively drying the radial invasion damped sample and the axial invasion damped sample subjected to the moisture invasion treatment;

according to carrying out radial invasion sample and the axial invasion sample that wets after the moisture invasion is handled is in before and after the drying weight change, obtain radial invasion sample's that wets moisture content with the moisture content of the axial invasion sample that wets.

In some embodiments, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper bushing, the moisture content K1 of the radial invasion moisture-affected test sample and the moisture content K2 of the axial invasion moisture-affected test sample are obtained by the following formulas:

wherein G1 is the weight of the radial invasion damped sample before drying, and Δ G1 is the weight difference between the radial invasion damped sample before drying and after drying; g2 is the weight before drying of the axially wetted specimen and Δ G2 is the difference between the weight before and after drying of the axially wetted specimen.

In some embodiments, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, the moisture-affected position of the epoxy glue impregnated paper sleeve is determined according to the moisture content K1 of the radial invasion moisture-affected test sample and the moisture content K2 of the axial invasion moisture-affected test sample.

In some embodiments, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, if the moisture content K1 of the radial invasion moisture-affected test sample is more than or equal to 0.01% and the moisture content K2 of the axial invasion moisture-affected test sample is less than 0.01%, the side wall of the epoxy glue impregnated paper sleeve is affected with moisture;

if the moisture content K1 of the radial invasion damped sample is less than 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the two end faces of the epoxy glue impregnated paper sleeve are damped;

and if the moisture content K1 of the radial invasion damped sample is more than or equal to 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the epoxy glue impregnated paper sleeve is damped integrally.

In some embodiments, in the method for simulating the moisture defect of the epoxy glue impregnated paper bushing, after the step of determining the moisture position of the epoxy glue impregnated paper bushing, the method further includes the following steps: and determining the moisture degree of the epoxy glue impregnated paper sleeve according to the moisture content K1 of the radial invasion moisture sample and the moisture content K2 of the axial invasion moisture sample.

In some embodiments, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, the side wall of the epoxy glue impregnated paper sleeve is affected with moisture, and the moisture content of the radially invaded and damped sample is used for determining the moisture-affected degree of the epoxy glue impregnated paper sleeve; the two end faces of the epoxy glue impregnated paper sleeve are damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined according to the moisture content of the axially invaded damped sample; the epoxy glue impregnated paper sleeve is wholly damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined by using the damping sample with higher moisture content in the radial invasion damping sample and the axial invasion damping sample;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.01% -0.05%, the epoxy glue impregnated paper sleeve is slightly damped;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.05% -0.1%, the epoxy glue impregnated paper sleeve is moderately damped;

and if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is more than 0.1%, the epoxy glue impregnated paper sleeve is heavily damped.

In some embodiments, in the method for simulating the moisture defect of the epoxy impregnated paper bushing, the material of the water-resistant layer is moisture-resistant insulating paint or silicon rubber.

In some embodiments, in the method for simulating the moisture defects of the epoxy glue impregnated paper bushing, the thickness of the water-resistant layer is 0.5 mm-2 mm.

In some embodiments, in the method for simulating the damp defect of the epoxy glue impregnated paper sleeve, the temperature of the moisture invasion treatment is 1-120 ℃.

In some embodiments, in the method for simulating the damp defect of the epoxy glue impregnated paper sleeve, the sleeve sample, the radial invasion damp sample subjected to the moisture invasion treatment and the axial invasion damp sample are subjected to an insulation performance test.

A preparation method of a damp sample of an epoxy glue impregnated paper sleeve comprises the following steps:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample; and

and coating a water-resistant layer on the side wall of the other sleeve sample, and not coating the two end faces of the other sleeve sample to prepare an axial invasion damped sample.

Compared with the prior art, the method for simulating the moisture defect of the epoxy glue impregnated paper sleeve has the following beneficial effects:

according to the method for simulating the moisture defect of the epoxy glue impregnated paper sleeve, the same epoxy glue impregnated paper sleeve is used as a sleeve sample, the two end faces of one sleeve sample are coated with the water-blocking layer, the side wall of the sleeve sample is not coated, and a radial invasion moisture sample is prepared; coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; further carrying out moisture invasion treatment on the radial invasion damped sample and the axial invasion damped sample; the moisture condition of different positions of the epoxy glue impregnated paper sleeve is convenient to inspect, the moisture position is judged, more efficient troubleshooting and fixed-point maintenance are facilitated when the epoxy glue impregnated paper sleeve is wetted, the whole epoxy glue impregnated paper sleeve does not need to be replaced, and the cost is effectively reduced.

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 other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a method for simulating moisture defects of an epoxy impregnated paper bushing according to an embodiment.

Detailed Description

The method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve and the preparation method thereof according to the present invention will be described in detail with reference to the following embodiments. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.

The traditional detection mode that the epoxy glue impregnated paper sleeve is wetted integrally only can detect whether the sleeve is wetted or not, and cannot judge the wetted position, so that further troubleshooting and maintenance cannot be carried out; and once damp, most of the cases can only replace the whole epoxy impregnated paper sleeve.

The embodiment of the invention provides a method for simulating the damp defect of an epoxy glue impregnated paper sleeve, which comprises the following steps:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample;

coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; and

and carrying out moisture invasion treatment on the radial invasion damped sample and the axial invasion damped sample.

According to the method, the same epoxy glue impregnated paper sleeve is used as a sleeve sample, a water-blocking layer is coated on two end faces of one sleeve sample, and the side wall of the sleeve sample is not coated, so that a radial invasion damped sample is prepared; coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; further carrying out moisture invasion treatment on the radial invasion damped sample and the axial invasion damped sample; the moisture condition of different positions of the epoxy glue impregnated paper sleeve is convenient to inspect, the moisture position is judged, more efficient troubleshooting and fixed-point maintenance are facilitated when the epoxy glue impregnated paper sleeve is wetted, the whole epoxy glue impregnated paper sleeve does not need to be replaced, and the cost is effectively reduced.

The embodiment of the invention also provides a preparation method of the damp sample of the epoxy glue impregnated paper sleeve, which comprises the following steps:

providing at least two identical epoxy glue impregnated paper sleeves as sleeve samples;

coating water-resistant layers on two end faces of a sleeve sample and not coating the side wall of the sleeve sample to prepare a radial invasion damped sample; and

and coating a water-resistant layer on the side wall of the other sleeve sample, and not coating the two end faces of the other sleeve sample to prepare an axial invasion damped sample.

The epoxy glue impregnated paper sleeve damp sample provided by the preparation method can effectively represent the performances of different invasion directions of the water content of the capacitor core of the epoxy glue impregnated paper sleeve.

In some examples, in the simulation method of the moisture defect of the epoxy glue impregnated paper sleeve, the length of the capacitor core in the sleeve sample is 2-3 times of the diameter of the sleeve sample.

It will be appreciated that controlling the dimensional relationship between the length and diameter of the thimble sample increases the creepage distance between the current carrying conductor and the end screen of the thimble sample.

In some examples, the diameter of the sleeve sample is 100 mm-5000 mm in the simulation method of the damp defect of the epoxy glue impregnated paper sleeve.

In some examples, in the simulation method of the moisture defects of the epoxy glue impregnated paper sleeve, the roughness grades of two end faces of the sleeve sample are N10-N14.

It can be understood that the roughness levels of the two end faces of the sleeve sample are controlled, so that the insulating property of the sleeve sample can be ensured to be close to that of the original sleeve capacitor core.

In some examples, in the epoxy impregnated paper sleeve damp defect simulation method, the capacitor plates in the capacitor core are arranged in equal length.

It can be understood that the capacitance plates in the capacitance core are arranged in equal length, so that the utilization rate of the capacitance core can be improved.

In some examples, in the method for simulating the moisture defect of the epoxy glue impregnated paper bushing, the method further comprises the following steps:

and testing the water content of the radial invasion damped sample and the axial invasion damped sample after the water invasion treatment.

It will be appreciated that any method of measuring moisture content may be used, such as by loss on drying.

In some examples, in the method for simulating moisture defects of the epoxy impregnated paper bushing, the moisture content test comprises the following steps:

respectively drying the radial invasion damped sample and the axial invasion damped sample subjected to the moisture invasion treatment;

and obtaining the moisture content of the radial invasion damped sample and the moisture content of the axial invasion damped sample according to the weight change of the radial invasion damped sample and the axial invasion damped sample before and after drying after the moisture invasion treatment.

In some examples, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, the moisture content K1 of the radial invasion moisture-affected test sample and the moisture content K2 of the axial invasion moisture-affected test sample are obtained by the following formulas:

wherein G1 is the weight of the radial invasion damped sample before drying, and Δ G1 is the weight difference between the radial invasion damped sample before drying and after drying; g2 is the weight before drying of the axially wetted specimen and Δ G2 is the difference between the weight before and after drying of the axially wetted specimen.

It can be understood that the weight of the invaded and damped sample can be obtained by utilizing a wide-range high-precision halogen moisture meter; the degree of sample drying was: the weight change rate of the invaded and damped sample after two adjacent drying is less than 0.01%/h.

In some examples, in the method for simulating the moisture defect of the epoxy impregnated paper bushing, before the moisture content test, the method further comprises the following steps:

removing the moisture on the surfaces of the water blocking layers on the two end surfaces of the radial invasion damped sample subjected to the moisture invasion treatment;

and removing the moisture on the surface of the water blocking layer on the side wall of the axial invasion damped sample subjected to moisture invasion treatment.

It can be understood that the cleaning of the surface moisture of the non-test area (water-blocking layer) invading the damp sample in different directions can reduce the influence of the surface moisture of the non-test area on the test.

In some examples, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, the moisture-affected position of the epoxy glue impregnated paper sleeve is determined according to the moisture content K1 of the radial invasion moisture-affected test sample and the moisture content K2 of the axial invasion moisture-affected test sample.

In some examples, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, if the moisture content K1 of the radially-invading moisture-affected test sample is more than or equal to 0.01% and the moisture content K2 of the axially-invading moisture-affected test sample is less than 0.01%, the side wall of the epoxy glue impregnated paper sleeve is affected with moisture;

if the moisture content K1 of the radial invasion damped sample is less than 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the two end faces of the epoxy glue impregnated paper sleeve are damped;

if the moisture content K1 of the radial invasion damped sample is more than or equal to 0.01 percent and the moisture content K2 of the axial invasion damped sample is more than or equal to 0.01 percent, the epoxy glue impregnated paper sleeve is damped integrally.

The damp position can be judged by setting damp samples in different invasion directions and testing the water content of the damp samples respectively. It can be understood that the basis for judging whether the damp is affected can be adjusted according to the actual situation.

In some examples, in the method for simulating the moisture defect of the epoxy glue impregnated paper bushing, after the step of determining the moisture position of the epoxy glue impregnated paper bushing, the method further comprises the following steps: and determining the moisture degree of the epoxy glue impregnated paper sleeve according to the moisture content K1 of the radial invasion moisture sample and the moisture content K2 of the axial invasion moisture sample.

In some examples, in the method for simulating the moisture-affected defect of the epoxy glue impregnated paper sleeve, the side wall of the epoxy glue impregnated paper sleeve is affected with moisture, and the moisture content of the radially invaded moisture-affected test sample is used for determining the moisture-affected degree of the epoxy glue impregnated paper sleeve; the two end faces of the epoxy glue impregnated paper sleeve are damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined according to the moisture content of the axially-invaded damped sample; the epoxy glue impregnated paper sleeve is wholly damped, and the damping degree of the epoxy glue impregnated paper sleeve is determined by using a damping sample with higher moisture content in a radial invasion damping sample and an axial invasion damping sample;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.01-0.05%, the epoxy glue impregnated paper sleeve is slightly damped;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is 0.05% -0.1%, the epoxy glue impregnated paper sleeve is moderately damped;

if the moisture content K1 of the radial invasion damped sample or the moisture content K2 of the axial invasion damped sample is more than 0.1%, the epoxy glue impregnated paper sleeve is heavily damped.

The moisture degree judging device can be used for judging the moisture degree according to actual conditions, judging epoxy glue impregnated paper sleeves with different requirements and maintaining in time.

In some examples, in the method for simulating the moisture defect of the epoxy impregnated paper bushing, the material of the waterproof layer is moisture-proof insulating paint or silicon rubber.

In some specific examples, in the method for simulating moisture defects of the epoxy impregnated paper bushing, the moisture-proof insulating paint is at least one selected from a solvent-based moisture-proof paint, a water emulsion-based moisture-proof paint and a reaction-based moisture-proof paint.

In some examples, in the simulation method of the moisture defect of the epoxy glue impregnated paper sleeve, the thickness of the waterproof layer is 0.5 mm-2 mm.

Through the thickness of control water blocking layer, can prevent that moisture from getting into the electric capacity core, in certain extent, the waterproof performance is more excellent for the thickness is big more.

In some examples, the moisture invasion temperature of the epoxy glue impregnated paper sleeve pipe in the moisture defect simulation method is 1-120 ℃.

In some examples, in the simulation method of the moisture-affected defect of the epoxy impregnated paper sleeve, the condition of the moisture invasion treatment is a gas environment or a water environment.

It can be understood that the gas environment is to place the sample coated with the water-resistant layer in a constant temperature and humidity chamber, and the water environment is to place the sample coated with the water-resistant layer in constant temperature water.

It can be understood that in the water area environment, in order to increase the water invasion speed, the temperature can be increased according to the requirement; in the case of a gas atmosphere, the temperature and humidity can be increased as required to increase the water intrusion rate.

In some examples, in the simulation method of the moisture defect of the epoxy glue impregnated paper sleeve, the temperature of the water environment is 1-120 ℃.

In some examples, in the method for simulating the moisture defects of the epoxy glue impregnated paper sleeve, the temperature of the gas environment is 10-120 ℃, and the humidity is more than or equal to 90% RH.

In some examples, in the epoxy glue impregnated paper sleeve pipe damp defect simulation method, a sleeve pipe sample, a radial invasion damp sample subjected to moisture invasion treatment and an axial invasion damp sample are subjected to insulation performance test.

According to the result of the insulation performance test, the insulation performance of the sleeve sample and the radial invasion damped sample and the axial invasion damped sample after the moisture invasion processing are compared, and the influence of different invasion directions of moisture on the insulation performance of the epoxy glue impregnated sleeve can be judged. The insulation performance test comprises the following steps: insulation resistance, breakdown strength, dielectric loss factor, capacitance.

In some of these examples, the epoxy impregnated paper bushing moisture defect simulation method does not coat the surface of the capacitive core in the bushing sample with a water-blocking layer.

It will be appreciated that the surface of the capacitive core in the bushing sample is not coated with a water barrier layer to facilitate the ingress of moisture into the interior of the bushing core from this direction.

In some examples, in the method for simulating the moisture defects of the epoxy glue impregnated paper sleeve, before the waterproof layer is coated, the method further comprises the following steps of leading out a high-voltage end and a low-voltage end:

leading out a high-voltage end: one end of a first cable is electrically connected with the central current-carrying conductor of the sleeve, and the other end of the first cable is used as a high-voltage signal leading-out end;

leading out a low-voltage end: one end of the second cable is electrically connected with the outermost capacitor plate at the axial middle position of the sleeve, and the other end of the second cable is used as a low-voltage signal leading-out end.

The high-voltage end and the low-voltage end are led out, so that the subsequent insulation performance test is facilitated; one end of the second cable is electrically connected with the outermost capacitor plate in the axial middle position of the sleeve, so that the creepage distance of the sleeve sample is increased, and the insulation performance is improved; the high pressure side and the low pressure side need to be brought out before the water-blocking layer is applied.

Referring to fig. 1, in some specific examples, the method for simulating the moisture defect of the epoxy glue impregnated paper sleeve includes steps S10 to S70:

step S10: and preparing a capacitor core, and arranging capacitor plates with equal length.

Step S20: and (3) segmenting the core body, namely segmenting the capacitor core body into short samples, wherein the length of each short sample is 2-3 times of the diameter of the capacitor core body, and the roughness grades of the end surfaces on the two sides are N10-N14, so that the short samples of the sleeve are formed.

Step S30: and the high-voltage end is led out, one end of the cable is electrically connected with the central current-carrying conductor of the sleeve, and the other end of the cable is used as a high-voltage signal leading-out end.

Step S40: and leading out the low-voltage end, polishing the axial middle position of the short sleeve to the outermost capacitor plate of the sleeve, electrically connecting one end of the cable with the capacitor plate, and taking the other end as a low-voltage signal leading-out end.

Step S50: coating a water-resistant layer, namely coating the water-resistant layer on two end faces of a sleeve sample without coating the side wall of the sleeve sample, and preparing a radial invasion damped sample; and coating a water-resistant layer on the side wall of the other sleeve sample, and not coating the two end faces of the other sleeve sample to prepare an axial invasion damped sample.

Step S60: and (3) carrying out water invasion on the core body, namely placing the radial invasion damped sample and the axial invasion damped sample in a gas environment with the temperature of 10-120 ℃ and the humidity of more than or equal to 90% RH, or in a water area environment with the temperature of 1-120 ℃.

Step S70: cleaning moisture in a non-test area, namely cleaning the moisture on the surfaces of water blocking layers on two end surfaces of a radial invasion damped sample subjected to moisture invasion treatment; and removing the moisture on the surface of the water blocking layer on the side wall of the axial invasion damped sample subjected to moisture invasion treatment.

Step S80: the water content and the insulation performance test are carried out, the water content test is carried out on the radial invasion damped test sample and the axial invasion damped test sample after the moisture invasion processing, and the insulation performance test is carried out on the radial invasion damped test sample and the axial invasion damped test sample and the sleeve pipe pattern after the moisture invasion processing.

Step S90: and (6) analyzing the data. According to the results of the water content and insulation performance tests, judging the damp position and the damp degree, and analyzing the influence of different invasion directions of water on the insulation performance of the epoxy glue impregnated paper sleeve.

According to the method, the same epoxy glue impregnated paper sleeve is used as a sleeve sample, a water-blocking layer is coated on two end faces of one sleeve sample, and the side wall of the sleeve sample is not coated, so that a radial invasion damped sample is prepared; coating a water-resistant layer on the side wall of the other sleeve sample, and not coating two end faces of the other sleeve sample to prepare an axial invasion damped sample; further carrying out moisture invasion processing on the radial invasion damped sample and the axial invasion damped sample, carrying out moisture content test on the radial invasion damped sample and the axial invasion damped sample after the moisture invasion processing, and carrying out insulation performance test on the radial invasion damped sample and the axial invasion damped sample after the moisture invasion processing and a sleeve pattern; according to the moisture content and the insulating property test result, the moisture conditions of different positions of the epoxy glue impregnated paper sleeve can be inspected, the moisture content of different invasion directions of the moisture of the epoxy glue impregnated paper sleeve is effectively reflected, so that the moisture position and the moisture degree of the epoxy glue impregnated paper sleeve are judged, more efficient troubleshooting of the moisture of the epoxy glue impregnated paper sleeve is facilitated, fixed-point maintenance is implemented, the whole epoxy glue impregnated paper sleeve does not need to be replaced, and the cost is effectively reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. It should be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the appended claims. Therefore, the protection scope of the present invention should be subject to the content of the appended claims, and the description and the drawings can be used for explaining the content of the claims.