Specification for step-down 3 phase transformers and earthing resistors for power distribution in d.c. traction systems
|Publication Date:||1 December 2005|
This specification applies to all new step-down transformers installed on the d.c. electrified lines.
This specification states the requirements for the design, manufacture and testing of stepdown three phase transformers and their associated earthing resistors in the range:
33/11 kV up to 10 MVA
33/22 kV up to 15 MVA
They are used for power distribution in d.c. traction systems where incoming supplies are at 33 kV and distribution to traction substations is at 11 kV or 22 kV.
The document is to be read in conjunction with the relevant procurement specification.