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A medium voltage load break switch can de-energise circuits under normal operating conditions. It should be capable of making and breaking normal load currents, such as cable charging currents and transformer no-load currents. Next to that the load break switch must be able to perform making operations under short-circuit conditions, since this is a possible operation condition when energising a medium voltage circuit under short-circuit conditions.
Load break switches can be divided into three main groups, namely:- Single operation
- Ring main unit
- Switch fuse combination
The IEC 60265-1 and ANSI C37.74 are the applicable standards for testing medium voltage load break switches.
When the load break switch is a part of a ring main unit the short circuit tests should be performed according the IEC 60265-1, IEC 62271-200 and standards that are applicable to other components that are a part of the ring main unit.
Additional tests that should be performed on the last group, the switch fuse combination, are mentioned in the IEC 62271-105.
At the KEMA High-Power Laboratory tests on load break switches are performed with the highest accuracy and under well-defined conditions in accordance with the standards requirements.
Furthermore, for obtaining a KEMA Type Test Certificate the more tests need to be performed by the KEMA High-voltage Laboratory, such as:- Dielectric tests
- Temperature-rise test
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[download] Brochure KEMA High-Power and High-Voltage Laboratories (.pdf 1.493 kb)
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