This Technical Specification is applicable to high voltage (HV) bushings, intended for use in traction
transformers of rail vehicles, cooled by insulating liquid with rated voltages up to 25 kV single phase
and rated currents up to 630 A at frequencies from 16,7 Hz to 60 Hz.
HV bushings within the scope of this Technical Specification are bushings for separable connectors
that connect the power supply coming from a contact wire or from a contact rail to the primary winding
of the traction transformer. The Technical Specification only deals with HV bushings that are mounted
to the transformer.
CLC/TS 50537-1 gives consideration to both technical and normative requirements of the railway
environment and restricts the variety provided by industry-wide standards for bushings, such as
EN 50180 and EN 60137. It determines requirements and tests enabling the interchangeability
especially regarding electrical and mechanical interfaces. Furthermore, service conditions are
described.
The cable plug as the counterpart of the HV bushing’s plug-in end is not covered by this Technical Specification.