SPECIFICATION DEVELOPMENT

The client specification defines the requirements by which the vendor is to design, manufacture, test, ship, and installs the transformer.  This document may be relatively simple to very complex.  JBTC has written specifications for many types of power transformers including distribution substation transformers, generator step up transformers, autotransformers, phase shifting transformers, gas insulated power transformers, power transformers for wind and solar power generation, shunt reactors, mobile transformers and mobile substations, and transformers for SVC or STATCOM application.

The specification defines all aspects of the power transformer taken as a system.  Performance characteristics, dielectric capability, short circuit capability, mechanical design internally and externally, thermal performance, magnetic field heating analysis, and dielectric fluid requirements are some of the more important elements of the transformer that must be addressed in the specification.  In addition, the accessories that are comprised of bushings, heat transfer equipment, surge arresters, current transformers, oil preservation, controls and instrumentation, wiring, and monitoring systems must be specified.  Any special operating conditions have to be identified for the vendor and these may include the ambient temperature range, seismic activity, ice load, wind load, and geomagnetic disturbance capability, to name a few.

JBTC follows the philosophy that the specification is not intended to tell the vendor how to design the power transformer.  The specification is written to define minimum requirements so all vendors quoting are on a level playing field for the development of their proposal to the client.