Polymer line post insulator
Polymer line post insulator definition:
Polymer line post insulator is one kind of the composite line insulator, which consists of an FRP core, silicon rubber housing and metal end fittings. The core can bear the mechanical load, the silicon rubber housing can protect the core, and the loads can be transmitted to the core by metal fittings. The type of the polymer line post insulator can be decided by the place it is used.
polymer line post insulator composite line post insulator
The cantilever of the polymer line post insulator:
polymer line post insulator has clamp top type and tie top, and polymer line post insulator has better cantilever strength. Unlike the conventional insulators (porcelain, glass, and even ceramic suspension insulator), polymer line post insulator can be used when visibly deformed by an applied load, but when this condition comes to the conventional insulators, generally those insulators have failed.
Structure of the polymer line post insulator:
An FRP Core: As the internal insulating part, its function is to ensure the mechanical characteristics of the high voltage insulator.
Silicon Rubber Housing: It is the external part, provides the necessary leakage distance and protects the core from the weather of the composite line post insulator.
Metal End fittings:Crimped on both end of the core, it can transmit the mechanical loads to the core.
The tests of the polymer line post insulator:
Design tests: Tests on the interfaces and connections of end fittings, Assembled core load tests, Tests of shed and housing material, Tests for the core material.
Type tests: Verification of dimensions, Electrical tests, Mechanical tests.
Sample tests: Verification of dimensions (E1+E2), Galvanizing test(E1+E2), Verification of the SCL(E1), Re-testing procedure.
Routine tests: Tensile load test, Visual examination.