Transformer Protective Cover

Core Functions

• Insulation & Anti-Shock

  Isolates live exposed parts to prevent accidental contact by personnel. Improves wet flashover and pollution flashover voltage, avoiding flashover and short circuits in rainy or polluted environments.
• External Damage Resistance

  Prevents phase-to-phase short circuits caused by small animals (birds, rats, snakes), branches, and foreign objects. Resists salt spray, acid rain, and chemical corrosion, and slows down connector oxidation.
• Phase Identification

  Available in yellow, green, red, and black for phase sequence verification on-site. Some models are equipped with observation windows, allowing oil level and connection status to be checked without removing the cover.

Main Materials & Technology

• HTV High-Temperature Vulcanized Silicone Rubber (Most Common)

  Molded via high-temperature vulcanization, with a thickness of 2–3 mm (usually 3 mm for high voltage).

  Wide temperature resistance: -60℃ to +180℃.

  Dielectric strength ≥ 20 kV/mm.

  Excellent UV resistance and hydrophobicity.

  Service life: 20–30 years.

  Snap-on structure, reusable and easy for maintenance.
• Heat-Shrinkable Protective Cover

  Shrinks and fits tightly when heated, with good sealing performance but inconvenient for maintenance.

  Mainly used for temporary protection or small terminals.
• Composite Polymer Material

  Balances cost and performance, suitable for medium and low voltage applications.

Classification & Installation

• By Voltage Level

  Low voltage (10 kV and below), medium voltage (35–110 kV), high & extra-high voltage (220 kV and above).
• By Application Part

  High-voltage bushing cover, low-voltage outlet cover, neutral point cover, arrester / fuse connector cover.
• Installation

  Cold-applied snap-on type (mainstream for silicone rubber).

  No hot work required; one person can complete installation quickly.

  Phase colors strictly follow:

  Phase A – Yellow, Phase B – Green, Phase C – Red, Neutral N – Black.