scope:

This document establishes the requirements and test procedures for the procurement of an electronic power transformer module.

The following electrical parameters reflect the 0° to 60°C end-of-life limits from table I.

Name Transformer Family Power Key code RPN Size 1U Weight 2.27 kg maximum Failure rate 0.865 failures/10⁶ hours maximum Environment Class I as specified in MIL-STD-1389 Working voltage 225 V peak Input voltage 110 to 121 Vrms, 400 Hz ±6% Maximum power dissipation 24 W Commutating inductance Secondary No. 1 and No. 2 36 µH Secondary No. 3 and No. 4 4.7 µH Core loss 16 W maximum

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Electronic Systems Command, ATTN: ELEX 5043, Department of the Navy, Washington, D.C. 20360, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

This module contains a transformer with one primary and six secondary windings. The primary is a three-phase, three-wire open-delta connection; three of the secondaries are wye-connected each with a neutral, the fourth secondary is wye-connected without a neutral, and the remaining two are single-phase windings. Each primary winding has two taps and all secondary windings, except those of secondary No. 1, have one tap. There is an electrostatic shield between the primary and secondaries; the shield is tied to the core.