{"id":1190,"date":"2026-07-22T05:33:00","date_gmt":"2026-07-22T05:33:00","guid":{"rendered":"https:\/\/lstransformer.com\/how-to-deal-with-surface-tracking-on-bushing-key-considerations-for-rtv-silicone-coating-application\/"},"modified":"2026-09-23T15:48:58","modified_gmt":"2026-09-23T15:48:58","slug":"how-to-deal-with-surface-tracking-on-bushing-key-considerations-for-rtv-silicone-coating-application","status":"publish","type":"post","link":"https:\/\/www.lstransformer.com\/de\/how-to-deal-with-surface-tracking-on-bushing-key-considerations-for-rtv-silicone-coating-application\/","title":{"rendered":"How to Deal with Surface Tracking on Bushing? \u2014Key Considerations for RTV Silicone Coating Application"},"content":{"rendered":"

How to Deal with Surface Tracking on Bushing?<\/b><\/h1>\n

\u2014Key Considerations for RTV Silicone Coating Application<\/b><\/h4>\n

Surface tracking on reactor bushings is a critical cause of power equipment failures. According to the IEEE 1584-2018 standard, 35% of insulation failure cases are directly attributed to tracking phenomena. This article systematically explains solutions for handling surface tracking and details the standardized application process for RTV silicone coatings based on the IEC 62217 international specification.<\/p>\n

Inhalt<\/span><\/b><\/b><\/h2>\n

1. In-Depth Analysis of the Hazards of Surface Tracking<\/em><\/b><\/h3>\n

The carbonized conductive channels formed by surface tracking on reactor bushings can trigger a three-level chain reaction of hazards:<\/p>\n

(1) Stepwise Decline in Insulation Performance<\/strong><\/h6>\n

The carbonized paths increase leakage current by 50%-300% (based on IEC 60507 test data), reducing surface flashover voltage by over 40%. When leakage current density exceeds 3mA\/cm\u00b2, localized temperature rise can reach over 200\u00b0C, accelerating thermal aging of insulation materials.<\/p>\n

(2) Irreversible Structural Damage<\/strong><\/h6>\n

Continuous discharge can erode the silicone rubber or porcelain surface of bushings, creating pits deeper than 2mm (see Figure 1). Experiments show that pits deeper than 0.5mm increase electric field distortion by 80%, raising the risk of internal insulation breakdown.<\/p>\n

(3) System-Level Chain Reaction Failures<\/strong><\/h6>\n

Single-phase bushing flashover can lead to inter-phase short circuits, generating short-circuit currents exceeding 40kA in 35kV systems (as per the IEC 62271-100 calculation model). This can cause protection device malfunctions, grid oscillations, and other systemic accidents.<\/p>\n

Key Data:\u00a0EPRI research reports indicate that untreated surface tracking increases equipment failure rates by 6.8 times.<\/p>\n

\"\"<\/a><\/p>\n

2. Methods for Handling Surface Tracking on Reactor Bushings<\/em><\/b><\/h3>\n

2.1 Conventional Treatment Methods<\/strong><\/i><\/h4>\n\n\n\n\n\n\n
Method<\/b><\/td>\nApplicability<\/b><\/td>\nPros and Cons<\/b><\/td>\n<\/tr>\n
Mechanical Polishing<\/td>\nMinor surface tracking<\/td>\nRemoves carbonized layers but may damage insulation materials.<\/td>\n<\/tr>\n
Chemical Cleaning<\/td>\nSevere contamination<\/td>\nCleans pollutants but requires avoiding corrosive solvents.<\/td>\n<\/tr>\n
Localized Repair<\/td>\nLocalized damage<\/td>\nUses insulating paint or epoxy resin for filling, but durability is limited.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2.2 RTV Silicone Coating Protection Technology<\/strong><\/h4>\n

RTV silicone coating is one of the most effective anti-tracking measures, offering the following advantages:<\/p>\n

(1)Hydrophobicity:\u00a0Forms water droplets on the surface, reducing wetting area and leakage current.<\/strong>
\n(2)Self-Cleaning:Prevents contamination buildup, minimizing conductive layer formation.<\/strong>
\n(3)Weather Resistance:\u00a0UV-resistant and high-temperature tolerant (-50\u00b0C to 200\u00b0C), suitable for outdoor environments.<\/strong><\/h6>\n

2.3 Anti-Tracking Mechanism of RTV Coating:<\/strong><\/h4>\n
(1)Lowers Surface Energy:Silicone rubber\u2019s hydrophobic properties prevent continuous water film formation, reducing conductive paths.<\/strong>
\n(2)Suppresses Partial Discharge:High resistivity (>10\u00b9\u2074 \u03a9\u00b7cm) reduces leakage current, preventing carbonization.<\/strong>
\n(3)Elastic Protection:The coating adapts to thermal expansion and contraction of bushings, avoiding cracks.<\/strong><\/h6>\n

2.4 Key Considerations for RTV Silicone Coating Application<\/strong><\/h4>\n

Pre-Application Preparation<\/p>\n\n\n\n\n\n\n
Element<\/b><\/td>\nTechnical Standard<\/b><\/td>\nKey Steps<\/b><\/td>\n<\/tr>\n
Surface Cleaning<\/td>\nASTM D3359 Adhesion Grade B<\/td>\n1. Sandblasting: 80-100 mesh quartz sand, 0.6MPa pressure.2. Chemical cleaning: Isopropyl alcohol + deionized water (1:3), wipe 3 times.<\/td>\n<\/tr>\n
Defect Repair<\/td>\nIEC 62217 Annex C<\/td>\nFill pits >0.3mm deep with EP-42 epoxy resin; post-curing surface <0.1mm.<\/td>\n<\/tr>\n
Environmental Control<\/td>\nIEEE 1523-2018<\/td>\nTemperature: 5-35\u00b0C \/ Humidity <65% RH, dew point\u6e29\u5dee \u22653\u00b0C.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2.5 Critical Control Points During Coating Application<\/strong><\/h4>\n
2.5.1 Primer Application<\/strong><\/h5>\n

Necessity: Porcelain bushing surface energy (~45mN\/m) is lower than RTV silicone (>100mN\/m), requiring primer for enhanced adhesion.<\/p>\n

Specifications:<\/p>\n

(1) Use silane-based primer (e.g., Dow Corning 1200).<\/strong>
\n(2) Spray thickness: 5-8\u03bcm, coverage: 150g\/m\u00b2.<\/strong>
\n(3) Drying time: 15min (25\u00b0C environment).<\/strong><\/h6>\n
2.5.2 RTV Main Coating Application<\/strong><\/h5>\n
(1) Spraying Formula:<\/strong><\/h6>\n

\"wps3\"<\/p>\n

Q: Coating amount (kg)
\nD: Bushing diameter (m)
\nL: Spraying length (m)
\n\u03b4: Design thickness (mm)
\n\u03c1: Density (1.2g\/cm\u00b3)
\n\u03b7: Utilization rate (0.7)<\/i><\/p>\n

(2) Layered Spraying Process:<\/strong><\/i><\/h6>\n\n\n\n\n\n\n
Layer<\/b><\/td>\nThickness Control<\/b><\/td>\nDrying Time<\/b><\/td>\n<\/tr>\n
First Layer<\/td>\n0.15\u00b10.02mm<\/td>\n30min (25\u00b0C)<\/td>\n<\/tr>\n
Second Layer<\/td>\n0.20\u00b10.03mm<\/td>\n45min<\/td>\n<\/tr>\n
Final Layer<\/td>\n0.10\u00b10.02mm<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
(3) Prohibited Conditions:<\/strong><\/h6>\n

Wind speed >3m\/s prohibits outdoor application.
\nRelative humidity fluctuations >10%\/h require work\u00a0\u00a0\u00a0suspension.<\/p>\n

2.6 Curing Quality Verification<\/em><\/i><\/h3>\n

Three-Level Inspection Process:<\/p>\n

2.6.1 Visual Inspection (2h post-application)<\/strong><\/h5>\n
(1) Orange peel texture: Wavelength 0.5-1.5mm qualifies.<\/strong><\/h6>\n
(2) No sagging or fish-eye defects.<\/strong><\/h6>\n
2.6.2 Electrical Performance Test (24h post-curing)<\/strong><\/h5>\n\n\n\n\n\n
Test Item<\/b><\/td>\nStandard Value<\/b><\/td>\nMethod<\/b><\/td>\n<\/tr>\n
Insulation Resistance<\/td>\n\u22655000M\u03a9<\/td>\nIEC 60243-1<\/td>\n<\/tr>\n
Hydrophobicity<\/td>\nHC1-HC2 Level<\/td>\nIEC 62073<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
2.6.3 Thickness Verification (7 days post-curing)<\/strong><\/h5>\n
(1) Use Elcometer 456 coating thickness gauge.<\/strong>
\n(2) Allowable deviation: \u00b10.05mm.<\/strong><\/h6>\n

\"\"<\/a><\/p>\n

3.<\/span>\u00a0Long-Term Maintenance Strategy<\/em><\/b><\/h3>\n
(1) Coating Lifespan Prediction Model<\/strong><\/i><\/h6>\n

\"wps5\"<\/p>\n

L: Predicted lifespan (years)
\nL\u2080: Baseline lifespan (15 years)
\nT: Annual average temperature (\u00b0C)
\nSDD: Equivalent salt density (mg\/cm\u00b2)<\/p>\n

(2)\u00a0 \u00a0Preventive Maintenance Cycle<\/strong><\/i><\/h6>\n\n\n\n\n\n\n
Environment Level<\/b><\/td>\nInspection Cycle<\/b><\/td>\nKey Items<\/b><\/td>\n<\/tr>\n
Light Contamination<\/td>\n24 months<\/td>\nHydrophobicity degradation test.<\/td>\n<\/tr>\n
Heavy Contamination<\/td>\n6 months<\/td>\nCoating thickness + salt density test.<\/td>\n<\/tr>\n
Coastal Areas<\/td>\n3 months<\/td>\nChloride ion corrosion scan.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

(2)\u5de5\u5b66\u7684\u306a\u7bc4\u56f2:(0.3~0.5)X_L@f\u1d63<\/span><\/b><\/b><\/h2>\n

RTV silicone coatings can prevent over 95% of surface tracking on reactor bushings (based on CIGRE 338 report data). By following the standardized process of surface preparation \u2192 layered spraying \u2192 quantitative testing, along with the formulas and parameters provided in this article, the coating\u2019s effective lifespan can exceed 12 years. Maintenance personnel should monitor the environmental adaptability coefficient (K= T\u00d7RH\/1000) and initiate special protection measures when K >1.2.<\/p>\n

Kontakt<\/strong><\/h2>\n

\u96fb\u529b\u306e\u7b97\u51fa: single-phase transformer, three-phase-isolation in Transformatoren, elektrischen Transformator, Verteilung Transformator, step-down und step-up-Transformator, low-Spannung Transformator, hohe Spannung Transformator, Steuerung, Transformator, Ringkern Transformator, R-core-Transformator; DC-Spulen, AC Reaktoren, Filter-Reaktor -, line-und load reactor, drosseln, Filter-Reaktor, und die Mittel, hoch-Frequenz-Produkte<\/a>.<\/p>\n

\u304cV_peak\u7a4d\u306e\u904e\u96fb\u5727\u306e\u30d4\u30fc\u30af\u3068t_res\u306b\u5171\u9cf4\u3002 30%\u30de\u30fc\u30b8\u30f3\u63a8\u5968\u3092\u5360\u3081\u308b\u30b7\u30b9\u30c6\u30e0\u30d1\u30e9\u30e1\u30fc\u30bf\u5316\u3057\u307e\u3059\u3002<\/p>\n

2.2.3\u306e\u52d5\u7684\u5fdc\u7b54\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3 \u73fe\u4ee3\u306e\u30b7\u30b9\u30c6\u30e0\u5229\u7528\u30b5\u30a4\u30ea\u30b9\u30bf\u5236\u5fa1\u306b\u3088\u308b\u62b5\u6297\u6e1b\u8870(TCRD)\u3092\u691c\u77e5\u3059\u308b\u5171\u9cf4\u518510ms\u3001\u914d\u306e\u6b63\u78ba\u6027\u3001\u5207\u65ad\u4e2d\u306e\u901a\u5e38\u306e\u64cd\u4f5c\u306f\u907f\u3051\u307e\u3059\u3002<\/a>.<\/p>\n

3. \u9023\u643a\u6a5f\u69cb\u306e\u30a2\u30af\u30c6\u30a3\u30d6\u30d5\u30a3\u30eb\u30bf
\nWhatsApp\uff1a+86 13787095096
\nE-Mail: marketing@hnlsdz.com<\/p>","protected":false},"excerpt":{"rendered":"

How to Deal with Surface Tracking on Bushing? \u2014Key Considerations for RTV Silicone Coating Application Surface tracking on reactor bushings is a critical cause of power equipment failures. According to the IEEE 1584-2018 standard, 35% of insulation failure cases are directly attributed to tracking phenomena. This article systematically explains solutions for handling surface tracking and […]<\/p>\n","protected":false},"author":3,"featured_media":4055,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[48],"tags":[],"class_list":["post-1190","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq"],"yoast_head":"\nHow to Deal with Surface Tracking on Bushing? \u2014Key Considerations for RTV Silicone Coating Application - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD<\/title>\n<meta name=\"description\" content=\"Surface tracking on reactor bushings is a critical cause of power equipment failures. 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