IEC 61109 Isolators for Aerial Lines - Composite Suspension and Voltage Insulators for AC Systems with Rated Voltage Above 1000 V - Definitions, Test Methods and Acceptance Criteria

IEC 61109 applies to composite suspension/strain insulators consisting of a load-bearing cylindrical insulating solid core composed of fibers (usually glass) in a resin-based matrix, a casing made of polymeric material (outside the insulating core), and end connections. It is permanently attached to the insulation core.

The main technical changes compared to the previous edition are:

• Removal of test procedures now given in IEC 62217;
• Include clauses related to tolerances, environmental conditions, transportation, storage and installation;
• General improvement of the definition of tests for non-standard loads.

The composite insulators covered by this standard are designed for use as suspension/strain line insulators, but it should be noted that these insulators may occasionally be subject to compression or bending when used, for example, as phase separators.

This standard is partially applicable to hybrid composite insulators, where the core is made of a homogeneous material (porcelain, resin).

The purpose of this standard is:

• define the terms used;
• To determine test methods;
• To determine the acceptance criteria.

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