Low Insulator

Low-Voltage Insulator Product Introduction

I. Product Definition and Function

Low-voltage insulators are insulating components used in power systems with AC voltages ≤1000V or DC voltages ≤1500V. Their primary functions are to support and fix live conductors, ensure electrical isolation between conductors and ground/other conductors, and withstand mechanical loads and environmental stresses.

Core functions include:

Insulation Protection: Prevent current leakage or short circuits to ensure safe operation of electrical equipment.

Mechanical Support: Withstand conductor tension, vibration, and external impacts.

Environmental Adaptability: Maintain stable performance in harsh conditions such as humidity, pollution, and high temperatures.

II. Materials and Structure

Composite Materials:

Epoxy resin or silicone rubber as the base material, offering lightweight, pollution-resistant, and maintenance-free properties, suitable for highly polluted or complex environments.

Typical Structure:

Insulating Body: Composite material with a shed design to increase creepage distance.

III. Product Types and Features

Main Types:

Pin-type insulators: Used for straight poles to support conductors, common in low-voltage overhead lines.

Butterfly-type insulators: Butterfly-shaped design with strong tensile resistance, suitable for terminal or corner poles.

Suspension insulators: Disc-shaped structure used in strings for hanging conductors; pollution-resistant variants adapt to dirty environments.

Post insulators: Support busbars or equipment, commonly found in switchgear and transformers.

Core Features:

High Insulation Performance: Power-frequency withstand voltage 3-5kV, stable dielectric strength.

High Mechanical Strength: Tensile strength 8-20kN, Torsional strength 250-350N·m, Capable of enduring conductor tension and vibration.

Environmental Resistance:

Pollution resistance: Composite materials reduce contamination buildup and improve flashover voltage.

Temperature resistance: Ceramics/glass operate long-term at -50℃ to 120℃; composites have broader temperature ranges.

Low Maintenance: Composite materials require no cleaning.

IV. Technical Parameters and Specifications

Key Parameters:

Rated voltage: ≤1kV (AC) or ≤1.5kV (DC).

Creepage distance per kV: Typically ≥14mm/kV; pollution-resistant types exceed 25mm/kV.

Mechanical Load:

Pin-type insulators: Bending failure load 3-12.5kN.

Suspension insulators: Rated mechanical failure load 70-300kN.

Common Specifications:

Dimensions: Height 32-70mm, Diameter 14-60mm, Shed diameter 50-150mm

Color: Red or gray (common for composites).

Model Examples:

Pin-type: P-15T16 (15kV rated voltage, 16mm thread diameter).

Suspension-type: U70BLP (pollution-resistant, 70kN mechanical load).

V. Application Fields

Power Systems:

Low-voltage overhead lines: Support conductors and prevent short circuits.

Distribution equipment: Insulation support for switchgear, transformers, and distribution boxes.

Industrial automation: Insulation for terminals in motors, inverters, PLCs, etc.

Special Scenarios:

Anti-ice flashover: Shed-interleaved designs delay ice bridging and improve flashover voltage.

High-pollution areas: Pollution-resistant insulators minimize contamination buildup, suitable for chemical plants, mines, etc.