Control transformer sizing chart

Determine inrush and sealed VA. Take VA size from step go to standard VA size in chart below. The proper size , or the VA rating, of the control circuit transformer is important.

CONTROL VOLTAGE TRANSFORMER SELECTION GUIDE. Using the chart , we find the inrush.

To meet your complete control needs, SolaHD four series of control transformers , all of which exceed the NEMA standards.

The Se lec tion Chart can be used to identify the appropriate transformer for your ap .

Transformer Load expressed in amperes: Select the appropriate kVA size from the selection charts listed on this page or by using the single phase or three phase sizing formula listed below. CPTs are most commonly identified by their nominal, steady-state. Primary Overcurrent Protection.

This inrush current is dependent upon where in the sine wave the transformer was last turned off in relation to the point of the sinewave you are when you energize the transformer . Wire Sizing Charts (Tables 4-7). MAXIMUM ACCEPTABLE RATING OF SECONDARY OVERCURRENT PROTECTION. Follow that value to the far left side of the chart to select the continuous nominal VA rating of the transformer you will need. In practice, other components must be considered in applying circuit overcurrent protection.

For circuits with transformers , requirements for conductor protection per Articles. Fuses must be sized so they do not open during this inrush. Refer to the Regulation Data chart. Class CC, for sizing see chart of page 13.

Secondary fusing is required see chart for size. The following charts may be used to select the transformer size required. The Selection Chart can be used to identify the appropriate transformer for your application. Data subject to change without notice. An online transformer product selector is available in the Transformer section of our website or you can use the following steps below to.

Important: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code. Maximum Amp Rating for Current Limiting Fuses Based on Transformer . HPS Imperator control transformers from Hammond are specifically designed for high inrush applications requiring. Control Transformer Quick Selection Charts . Note: See over-current protection chart for transformers at the end of this section.