Distribution Transformer Connection Diagram

Distribution transformers 15 3 figure 15 3 two view construction standard detail of a conventional transformer to be installed on the distribution system.

Distribution transformer connection diagram. 120 x 240 secondary. The dashed lines indicate the transformer outlines. The diagrams in this section of the general electric distribution transformer guide book covers the most common types of connections for single phase transformers and three phase transformers. 240 x 480 secondary.

All the diagrams are for additive polarity for three phase transformers. However the required grounding electrode conductor is absent. Generalgeneral electrical connection diagramsacme transformer wiring diagrams primary. The 240 v is obtained by making connections between the two ungrounded hot conductors and the 120 v is obtained by making connections between either of the two hot ungrounded conductors and the neutral grounded conductor.

V l is the line to line voltage and v p is the phase to neutral voltage. 240 x 480 secondary. None x4x1 h4 h3 h2 h1 x2x3 primary. 120 240 2 2 1 2 anfc 4 2 2 bnfc x4 x1 h10 h2 h3 h1 x2 x3 h5 h6 h4 h7 h8 h9 connectconnect primary primary inter secondary.

None x4 x1 h4 h3 h2 h1 x2 x3 connect connect primary primary inter secondary volts lines to connect lines to. This separately derived system transformer has a compliant system bonding jumper. Conversely the y connection is used for stepping up to a high voltage as in generation station transformer. Note the fused cutout and lighting arrestor combination external to the transformer.

Figure 2 delta delta transformer connections click to expand diagram the connection diagram on the left shows how a delta delta connection can be made either with three single phase transformers or with one three phase transformer. Courtesy midamerican energy co figure 15 4 three phase pad mounted transformer installed in shopping center. Figure 1 is a schematic diagram of a distribution transformer for 120 240 v single phase service. The grounding electrode makes the earth connection for the transformer secondary circuit.

It must be an effective connection and all grounding paths must be connected to it. To make the transformer connections compatible with three phase supplies we need to connect them together in a particular way to form a three phase transformer configuration. C57 12 70 terminal markings and connections for distribution and power transformers ansi c57 105 guide to three phase transformer connections distribution transformer manual by general electric rus by alexander publications and transformer connections by general electric. The y connection is commonly used in stepping down from a high voltage to a medium or low voltage level as in distribution transformers.