阅读说明：本技术 一种和谐型电力机车车顶绝缘加强的方法 (Harmonious electric locomotive roof insulation reinforcing method ) 是由 邓晓玲 陈国勇 郝瑞 李凤得 张少卿 于 2020-06-24 设计创作，主要内容包括：本发明创造提供了一种和谐型电力机车车顶绝缘加强的方法,包括如下步骤：S1：将车顶油漆及旧涂层进行清理、清洁；S2：车顶绝缘漆喷涂：S3：对真空主断路器进行绝缘加强；S4：车顶高压电器顶部和底部加装绝缘护套；S5：对车顶高压电路连接线采用热缩高压套管进行绝缘防护。本发明创造所述的和谐型电力机车车顶绝缘加强的方法可以集车顶各部件与车内高压电器部件绝缘防护于一体,对机车内各高压电器部件按防护类别进行防护,达到绝缘防护尽可能全覆盖的良好绝缘效果。(The invention provides a harmonious electric locomotive roof insulation reinforcing method, which comprises the following steps: s1: cleaning and cleaning the paint and the old coating on the car roof; s2: spraying insulating paint on the roof: s3: carrying out insulation reinforcement on the vacuum main circuit breaker; s4: insulating sheaths are additionally arranged at the top and the bottom of the high-voltage electrical appliance on the roof; s5: and the high-voltage circuit connecting wire on the car roof is insulated and protected by adopting a heat-shrinkable high-voltage bushing. The harmonious electric locomotive roof insulation reinforcing method provided by the invention can integrate the insulation protection of various parts on the roof and high-voltage electric appliance parts in the locomotive into a whole, protect various high-voltage electric appliance parts in the locomotive according to the protection types, and achieve the good insulation effect that the insulation protection covers as full as possible.)

1. A harmonious electric locomotive roof insulation reinforcing method is characterized in that: the method comprises the following steps:

s1: cleaning and cleaning the paint and the old coating on the car roof;

s2: spraying insulating paint on the roof:

firstly, sticking a high-voltage insulating adhesive tape at the raised part of a welding seam of the car roof;

then, insulating paint spraying is carried out on the concave part of the car roof, so that the top of the sprayed concave part is flush with the car roof;

finally, spraying insulating paint on the convex part, the concave part and the roof cover to form insulating layers;

s3: insulating and reinforcing the vacuum main circuit breaker:

firstly, cleaning a vacuum main breaker, and protecting a lower air inlet joint of a main breaker mounting bottom plate, a plug and the bottom plate with a small hole;

then, bonding the silicon rubber climbing skirts on the umbrella skirt at the top of the vacuum main breaker and the umbrella skirt at the top of the lower insulator respectively by using silicon rubber glass cement, and filling a groove between the inner ring of the silicon rubber climbing skirts and the vacuum main breaker by using the glass cement;

finally, spraying anti-pollution flashover coating on the upper part of the mounting bottom plate of the vacuum main circuit breaker;

s4: insulating sheaths are additionally arranged at the top and the bottom of the high-voltage electrical appliance on the roof;

s5: and the high-voltage circuit connecting wire on the car roof is insulated and protected by adopting a heat-shrinkable high-voltage bushing.

2. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: the thickness of the insulating layer is 2 mm.

3. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: the insulating paint is preferably high-voltage-resistant insulating paint.

4. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: and in the step S4, insulating sheaths are respectively arranged at the bottoms of a pantograph supporting insulator, a bus supporting insulator, a lightning arrester, a high-voltage cable and a high-voltage transformer in the roof high-voltage electrical appliance.

5. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: and in the step S4, insulating sheaths are respectively arranged at the tops of a lightning arrester, a high-voltage cable and a high-voltage transformer in the vehicle roof high-voltage electrical appliance.

6. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: and in the step S4, an insulating sheath is arranged at the pantograph angle and the bottom of the connecting plate in the high-voltage electrical appliance on the roof.

7. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 6, wherein the method comprises the following steps: the bottom of the insulation sheath of the arch corner is sealed, the length of the insulation sheath of the arch corner is not less than 70mm, and the depth of the insulation sheath of the arch corner sleeved into the arch corner is not less than 90% of the insulation sheath of the arch corner.

8. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as claimed in claim 1, wherein the method comprises the following steps: and in the step S5, the conducting rod and the soft connecting wire at the top of the car are insulated and protected by adopting a heat-shrinkable high-voltage bushing.

9. The method for reinforcing the insulation of the roof of the harmonious electric locomotive as recited in claim 8, wherein: the high-voltage bushing and the conducting rod or the flexible connecting wire are the same in length.

Technical Field

The invention belongs to the field of roof protection of electric locomotives, and particularly relates to a harmonious roof insulation reinforcing method for an electric locomotive.

Background

The high-voltage electrical appliances of a partially harmonious electric locomotive are mainly distributed on the top cover of the locomotive and are easily attacked by severe weather such as rain, snow, wind, sand, fog, ice coating and the like after being exposed to the outdoor complex environment for a long time, so that the insulation between the high-voltage electrical appliances and the top of the locomotive is reduced, and the faults such as flashover, short circuit and the like occur, thereby affecting the normal operation of the locomotive. When the fault reason of the high-voltage equipment on the locomotive roof is not determined, the pantograph is raised blindly when the fault is cleared, the high-voltage equipment on the locomotive roof is possibly damaged, a contact net is bonded with a carbon slide plate of the pantograph, and the contact net can be blown to cause line paralysis in severe cases, so that the requirement on good insulation protection of the locomotive roof is more and more strict.

Disclosure of Invention

In view of the above, the present invention provides a method for reinforcing insulation of a roof of a harmonic electric locomotive, so as to integrate insulation protection of various parts of the roof and high-voltage electrical components in the locomotive into a whole, protect various high-voltage electrical components in the locomotive according to protection categories, and achieve a good insulation effect that the insulation protection covers as full as possible.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for reinforcing the insulation of the roof of a harmonious electric locomotive comprises the following steps:

s1: cleaning and cleaning the paint and the old coating on the car roof;

s2: spraying insulating paint on the roof:

firstly, sticking a high-voltage insulating adhesive tape at the raised part of a welding seam of the car roof;

then, insulating paint spraying is carried out on the concave part of the car roof, so that the top of the sprayed concave part is flush with the car roof;

finally, spraying insulating paint on the convex part, the concave part and the roof cover to form insulating layers;

s3: insulating and reinforcing the vacuum main circuit breaker:

firstly, cleaning a vacuum main breaker, and protecting a main breaker mounting bottom plate lower air inlet joint, a plug and a bottom plate with a small hole;

then, bonding the silicon rubber climbing skirts on the umbrella skirt at the top of the vacuum main breaker and the umbrella skirt at the top of the lower insulator respectively by using silicon rubber glass cement, and then filling a groove between the inner ring of the silicon rubber climbing skirts and the vacuum main breaker by using the glass cement;

finally, spraying anti-pollution flashover coating on the upper part of the mounting bottom plate of the vacuum main circuit breaker;

s4: insulating sheaths are additionally arranged at the top and the bottom of the high-voltage electrical appliance on the roof;

s5: and the high-voltage circuit connecting wire on the car roof is insulated and protected by adopting a heat-shrinkable high-voltage bushing.

Further, the thickness of the insulating layer is 2 mm.

Further, the insulating paint is preferably high-pressure resistant insulating paint.

Further, in S4, an insulating sheath is installed at the bottom of a pantograph support insulator, a bus support insulator, a lightning arrester, a high-voltage cable, and a high-voltage transformer in the roof high-voltage electrical appliance.

Further, in S4, an insulating sheath is installed on the top of the lightning arrester, the high-voltage cable, and the high-voltage transformer in the vehicle roof high-voltage electrical apparatus.

Further, in the step S4, an insulating sheath is installed on the pantograph corner of the high-voltage electrical apparatus on the roof and the bottom of the connecting plate

Furthermore, the bottom of the insulating sheath of the arch corner is sealed, the length of the insulating sheath of the arch corner is not less than 70mm, and the depth of the insulating sheath of the arch corner sleeved into the arch corner is not less than 90% of the insulating sheath of the arch corner.

Further, in S5, the roof conductive rod and the flexible connection line are insulated and protected by a heat-shrinkable high-voltage bushing.

Further, the high-voltage bushing and the conducting rod or the flexible connecting wire have the same length.

Compared with the prior art, the harmonious electric locomotive roof insulation reinforcing method has the following advantages:

(1) the method for reinforcing the roof insulation of the harmonious electric locomotive integrates the insulation protection of all parts on the roof and high-voltage electric appliance parts in the locomotive into a whole, protects all high-voltage electric appliance parts in the locomotive according to the protection types, and achieves the good insulation effect that the insulation protection covers as full as possible.

(2) According to the method for insulating and reinforcing the roof of the harmonious electric locomotive, disclosed by the invention, the roof is sprayed with the insulating paint, the convex part of the welding line of the roof easy to discharge is specially treated, the spraying process of the insulating paint on the uneven roof is improved, the top and the bottom of a high-voltage electric appliance on the roof are additionally provided with the insulating sheaths for protecting, the high-voltage circuit connection of the roof is insulated and protected, the main vacuum circuit breaker is insulated and reinforced, and the exposed potential discharge points of part of the high-voltage electric appliance are insulated and protected, so that the insulating and protecting grade among all parts of the roof is improved, the insulating and reinforcing effect is achieved, and the discharge fault.

(3) According to the method for reinforcing the roof insulation of the harmonious electric locomotive, the roof cover protection is sprayed by the stable and efficient insulating paint which is convenient and fast to construct, and the insulating protection effect with high insulating protection level and lasting protection is achieved.

(4) The harmonious electric locomotive roof insulation reinforcing method improves the insulation spraying method of the weld joint convex part and the convex and concave parts of the roof, and greatly improves the protection effect of the convex and concave parts.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

The invention will be described in detail with reference to the following examples.

Harmonious electric locomotive roof insulation reinforcing method

The method comprises the following steps:

s1: cleaning and cleaning the paint and the old coating on the car roof;

the old paint at the paint-stripping position and the paint surface bubble position of the car roof is cleaned up, and then the range is enlarged and the steel wire ball is used for reverse rubbing to clean the old paint until the metal luster is exposed on the car roof.

The root of the insulator and other hidden parts need to be cleaned intensively, firm old paint is reserved, and the paint surface cannot be obviously broken.

After removing dirt, dust and other impurities, blowing the residue and the dust clean by using a high-pressure air gun, then continuously wiping the sprayed surface by using a cleaning agent to achieve cleanness, wiping the surface to be sprayed by using pure cotton cloth, then blowing the surface to be sprayed by using the high-pressure air gun, and drying by using a hot air blower.

The complete cleaning of the old coating on the car roof is beneficial to enhancing the adhesive force of the insulating paint, and the insulating paint is not easy to peel, bulge and peel.

S2: spraying insulating paint on the roof:

firstly, sticking a high-voltage insulating adhesive tape at the raised part of a welding seam of the car roof;

then, insulating paint spraying is carried out on the concave part of the car roof, so that the sprayed concave part is flush with the car roof;

and finally, spraying insulating layers with the thickness of 2mm on the convex parts, the concave parts and the roof cover by using insulating paint.

Because the locomotive roof cover designs welding process, the protruding position of roof cover welding seam thickness is difficult to reach 2mm after the insulating varnish self-leveling, is the easy discharge point on the locomotive roof cover, in order to guarantee the insulating varnish spraying thickness of welding seam department, the selection is ground flat with the emery wheel when the old picture layer of roof cover is cleared up, and paste high-voltage insulating adhesive tape with high-voltage insulating sealant at the welding seam department, carry out insulating treatment before the insulating varnish spraying.

And (3) for the uneven part of the car roof, cleaning the concave part, spraying insulating paint, and then spraying the insulating paint on the whole car roof according to an insulating paint spraying process.

And (3) carrying out insulating paint spraying on the I and II end top covers of the roof of the harmonious electric locomotive and the mounting area of the central top cover vacuum main circuit breaker, wherein high-pressure-resistant insulating paint is selected, and the performance requirement is not lower than that of a common product in DL/T627-2012. The technical parameters of the high-voltage-resistant insulating paint are as follows:

(1) appearance: viscous liquid with uniform color and no obvious mechanical impurities and floccules.

(2) The solid content is not less than 50%.

(3) The viscosity of the coating is not less than 80s (coating-4 viscometer) at 25 ℃.

(4) Hydrophobicity: HC1 grade.

(5) Insulating property

a) Volume resistivity of not less than 1.0X1014(Ω. m);

b) the relative dielectric constant r is not more than 4.0;

c) a dielectric loss tangent tan of not more than 0.4%;

d) the dielectric strength E is not less than 20kV/mm (the thickness of a sample is 1mm +/-0.2 mm);

e) resistance to tracking and galvanic corrosion: not less than TMA4.5 grade.

(6) Mechanical Properties

a) The adhesive force between the insulating coating and the surface of the glass plate or the porcelain plate is detected by a ring drawing method to be not less than 2 grades (the thickness of a sample is 0.1 mm-0.2 mm);

b) the adhesive force between the insulating coating and the surface of the glass plate or the porcelain plate is detected by a shear strength method: not less than 3.0 MPa;

c) tear strength (square test specimen): not less than 3.0 kN/m;

d) mechanical tensile strength: not less than 1.2 MPa;

e) elongation at break: not less than 250%;

f) wear resistance: not more than 0.3 g.

(7) The flammability should reach FV-0 level.

(8) Self-cleaning property: the self-cleaning property of the glass bead method is up to grade 1; by using the film method, the film should not adhere.

(9) Corrosion resistance

a) Resistance to chemical agents

The product is soaked in acid, alkali and salt reagents (with the concentration of 3%) at 25 ℃ for 24 hours, and the phenomena of falling, wrinkling, bubbling, discoloration and the like are avoided.

b) Oil resistance

The transformer oil is soaked in the transformer oil at the temperature of 100 ℃ for 24 hours, and the phenomena of falling, wrinkling, bubbling, discoloration and the like are avoided.

S3: insulation reinforcement for vacuum main circuit breaker

Firstly, cleaning a vacuum main breaker, and protecting a main breaker mounting bottom plate lower air inlet joint, a plug and a bottom plate with a small hole;

then, adhering silicone rubber climbing skirts on the umbrella skirt at the top of the vacuum main circuit breaker and the umbrella skirt at the top of the lower insulator respectively by using silicone glass cement, and then filling a groove between the inner ring of the silicone rubber climbing skirts and the vacuum main circuit breaker by using glass cement;

and finally, spraying the anti-pollution flashover coating on the upper part of the mounting bottom plate of the vacuum main circuit breaker again.

The insulation strengthening of the vacuum main circuit breaker specifically comprises the following contents:

(1) the requirements before insulation reinforcement are as follows: the vacuum main breaker is cleaned before insulation reinforcement, the cleaning rear part can be sprayed, the main breaker is provided with a lower air inlet connector, a plug and a bottom plate with small holes before spraying, pollution flashover resistant paint and the like are prevented from entering, states of a porcelain insulator, a grounding clamp and the like are checked and confirmed, and after the states are confirmed to be good, the outer surface of the vacuum main breaker insulation reinforcement part and the grounding clamp are thoroughly cleaned.

(2) Insulating and reinforcing required materials: the vacuum main circuit breaker is insulated and reinforced by using a silicon rubber climbing skirt, a 35kV continuous long busbar (silicon rubber insulating tube), a 10kV composite insulating heat-shrinkable tape and a 20# high-voltage rubber self-adhesive tape, and an auxiliary material is a binder meeting the strength and conductive grease with good conductivity.

(3) And (3) insulating and reinforcing: the umbrella skirt on the top of the vacuum main circuit breaker and the umbrella skirt on the top of the lower insulator are respectively adhered with the silicon rubber climbing skirt by the silicon glass cement, and during adhesion, the silicon rubber climbing skirt and the corresponding umbrella skirt of the vacuum main circuit breaker are tightly adhered, dovetail grooves of the silicon rubber climbing skirt are well jointed, the joint adhesion is firm, and the appearance is smooth. After the silicon rubber climbing skirt is bonded, the groove between the inner ring of the silicon rubber climbing skirt and the vacuum main section is filled with a proper amount of glass cement, and pits are not allowed to exist in corresponding positions after filling.

(4) Other metal exposed positions on the vacuum real circuit breaker copper bar are wrapped with the compound insulating heat-shrinkable belt in a closely-dense winding mode, the wrapping thickness is uniform as much as possible, the heat is properly heated in time during wrapping, and the bonding and close-pasting degree of the insulating heat-shrinkable belt is enhanced. The high-voltage heat-shrinkable tube is used for insulating and protecting a vacuum main breaker in a high-voltage cabinet in a vehicle from discharging electricity, and a high-voltage heat-shrinkable tube for connecting a copper bar is used for insulating and protecting a main broken bottom plate bolt installation insulating protective cap.

After the main break insulation is strengthened, the main break copper bar conductive connection hole, the inside of the main break grounding clamp, the lower air inlet joint of the installation bottom plate, the plug and the bottom plate with the small hole are protected, and the anti-pollution flashover coating is sprayed on the part above the main break installation bottom plate again, particularly the lower surface of the porcelain bottle of the main circuit breaker, the copper bar, the wiring terminal and the like are sprayed in a key mode.

S4: insulating sheath is additionally arranged at top and bottom of high-voltage electrical appliance on car roof

Installing an insulating sheath at the bottom of a high-voltage electrical apparatus on the roof, which comprises a pantograph supporting insulator, a bus supporting insulator, a lightning arrester, a high-voltage cable and a high-voltage transformer; installing an insulating sheath on the top of the lightning arrester, the high-voltage cable and the high-voltage transformer; installing silicon rubber insulating caps on the high-voltage isolating switch, the high-voltage grounding switch and the vacuum main breaker installation bolt; an insulating protective sleeve is arranged on the pantograph angle of the pantograph and the connecting plate, the bottom of the pantograph angle insulating sleeve is sealed, the length is not less than 70mm, the depth of the insulating sleeve sleeved into the pantograph angle is not less than 90% of the length of the insulating pipe, and firmness and reliability after sleeving are guaranteed.

S5: insulating protection is carried out on a connecting wire of a high-voltage circuit on the roof by adopting a heat-shrinkable high-voltage bushing

The conductive rod and the soft connecting wire at the top of the vehicle are insulated and protected by adopting a heat-shrinkable high-voltage bushing, and the exposed part of the high-voltage connecting terminal of the supporting insulator is not bound, so that the inspection of the installation condition of the high-voltage conducting wire is facilitated. The length of the high-voltage bushing is consistent with that of the conducting rod or the flexible connecting wire, and the distance between the high-voltage bushing and the connecting position of the supporting insulator is kept; the thickness of the insulating sleeve of the conductive rod is not less than 3mm after the conductive rod is sleeved, and the thickness of the insulating sleeve of the flexible connecting line is not less than 2 mm.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.