NEMA TP 2

Abstract

This standard is intended for use as a basis for determining the energy efficiency performance of the equipment covered and to assist in the proper selection of such equipment. <br>This standard covers single-phase and three-phase dry-type and liquid-immersed distribution transformers at 60Hz for the North American system (transformers for transferring electrical energy from a primary distribution circuit to a secondary distribution circuit or within a secondary distribution circuit) <br>This standard addresses the test procedures for determining the efficiency performance of the transformers covered in NEMA Publication TP 1. <br>Products excepted from this standard include: <br>a. Autotransformers <br>b. Drive (Isolation) transformer <br>c. Grounding transformers <br>d. Machine tool (Control) transformers <br>e. Non-ventilated transformers <br>f. Rectifier transformers <br>g. Regulating transformers <br>h. Sealed transformers <br>i. Special impedance transformers <br>j. Testing transformers <br>k. Transformers with tap ranges greater than 15 percent <br>l. Uninteruptible Power Supply (UPS) transformers <br>m. Welding transformers <br>n. Mining transformers <br>o. K rated transformer, when tested with K&gt;1 (see Section 4.2.1) <br>NOTE&#8212;This standard does apply to K rated transformer when tested with K=1.