Substation transformer

Overview

Eaton’s Cooper Power series substation transformers are offered for new installations and retrofit solutions and are specified for indoor and outdoor use. Base rating is listed as 300-12,000 kVA in one specification and as 300 kVA to 12,500 kVA in another. Primary voltage is 2400-34,500 V (Delta or Wye) and secondary voltage listings include 208-15,000 V (25 kV available upon special request) and a ratings table showing 120 V to 24,940 V. Basic Impulse Level (BIL) ranges from 30 kV to 200 kV, additional forced-air ratings are +15%, +25%, +33% to base kVA, and fluids available are FR3 or mineral oil. Construction and enclosure features include cover-mounted or sidewall-mounted bushings, a wide range of core steels and winding conductors, flexible core/coil and tank construction, mild or stainless steel (304L) enclosures, cover or sidewall terminals, three-point latching and padlock air terminal chambers with recessed penta-head bolts, standard flanges and throats for close-coupling, and enclosure integrity that meets or exceeds ANSI/IEEE C57.12.28 and C57.12.29 if stainless construction. Standards and approvals include ANSI/IEEE C57.12.00 and C57.12.36, CSA C88-M90, NEMA TR-1 (sound level), and third-party recognition from FM Global and UL/cUL for most ratings. Designed for both new installations and retrofit solutions, these transformers support indoor and outdoor deployment. They can be supplied as close-coupled medium-voltage liquid-filled unit substations that integrate low- and medium-voltage assemblies in a streamlined unit substation design. Units can be configured for step-down and step-up power direction and for specialty designs addressing motor loads, harmonics, rectifier duty, K-factor and related requirements, and can be built for Class 1 Division 2 locations.