Insulator PDF
Mechanical failing load test
About Mechanical failing load test:
Mechanical failing load means the maximum load reached when a string insulator unit or a rigid insulator is tested under the prescribed conditions of test. We do mechanical falling load test to the pin type insulators we supplied.
A mechanically equivalent insulator unit is a type made in the same factory, with the same materials, by the same process, and has the same strength class, the same coupling size and the same design of connection between insulating components and metal parts.
pin type insulator
Test procedure for pin type insulators:
The pin or ceramic line post insulator shall be mounted as specified in the relevant position, and mechanical bending load shall be applied. The load shall be increased from zero, rapidly but smoothly, up to approximately 75 % of the specified mechanical failing load and shall then be gradually increased, at a rate, increasing the specified mechanical failing load per minute, until the failing load as defined requirements that is reached for pine insulators (the rates indicated correspond to reaching the specified mechanical failing load in a time between 15s and 45s). The failing load of pine type insulators shall be recorded. The above procedures for mechanical falling load test.
Acceptable standard for pin type insulators:
The high voltage insulator passes the test if the specified mechanical failing load is reached without mechanical failure of the insulating component. Additionally, for insulators with integral pin, the residual deflection of the insulating component at the point of application of the test load shall not exceed 20 % of the height of this point above the supporting plane.
The test for pin insulators is according to IEC60383 standard. About mechanical falling load test, from 11Kv to 33kv pin type insulator with high voltage are all to be done this test.