DIELECTRIC TEST

1. 60694 © IEC:1996+A1:2000+A2:2001 – 173 –
d) tightness test in accordance with 7.4;
e) design and visual checks in accordance with 7.5.
Additional routine tests may be necessary and will be specified in the relevant IEC standards.
When switchgear and controlgear are not completely assembled before transport, separate
tests shall be made on all transport units. In this event, the manufacturer shall demonstrate
the validity of his test (example: leakage rate, test voltage, resistance of part of the main
circuit).
Test reports of the routine tests are normally not necessary unless otherwise agreed upon
between manufacturer and user.
7.1 Dielectric test on the main circuit
A dry, short-duration power-frequency voltage test shall be applied. The test shall be made
according to IEC 60060-1, and to 6.2 on complete apparatus or on separate poles, or on
transport units in new, clean and dry conditions.
The test voltage shall be that specified in column 2 of tables 1 or 2, according to the relevant
IEC standards, or the applicable part of it.
When the insulation of switchgear and controlgear is provided only by solid-core insulators
and air at ambient pressure, the power-frequency voltage withstand test may be omitted if the
dimensions between the conductive parts – between phases, across open switching device
and between conductive parts and the frame – are checked by dimensional measurements.
Bases for the checking of dimensions are the dimensional (outline) drawings, which are part
of the type test report (or are referred to in it) of the particular switchgear and controlgear.
Therefore, in these drawings all information necessary for dimensional checking including the
permissible tolerances shall be given.
7.2 Tests on auxiliary and control circuits
7.2.1 Inspection of auxiliary and control circuits, and verification of conformity
to the circuit diagrams and wiring diagrams
The nature of the materials, the quality of assembly, the finish and, if necessary, the
protective coatings against corrosion shall be checked. A visual inspection is also necessary
to check the satisfactory installation of the thermal insulation.
A visual inspection of actuators, interlocks, locks, etc., shall be made.
Components for auxiliary and control circuits inside enclosures shall be checked for proper
mounting. The location of the means provided for connecting external wiring shall be checked
to ensure that there is sufficient wiring space for spreading of the cores of multi-core cables
and for the proper connection of the conductors.
The conductors and cables shall be checked for proper routing. Special attention shall be
given to ensure that no mechanical damage can occur to conductors and cables due to the
proximity of sharp edges or heating elements, or to the movement of moving parts.