Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 29, Problem 5SQ
Textbook Problem

If a delta-connected, six-lead motor nameplate reads “Full Load Current 170 Amperes,” on what current rating should the overload relay setting or the selection of the heater elements be based?

To determine

Calculate the current rating for overload relay setting or the heater elements selection.

Explanation of Solution

Given data:

The full load current of delta-connected, six-lead motor is 170 A.

Formula Used:

If the motor nameplate indicates only the delta-connected full-load current, divide the full-load current value by 1.73 to obtain the winding current that is the rating for overload relay setting.

Consider the expression to find the current rating of overload relay setting.

Currentrating=Full-loadcurrent1.73 (1)


Substitute 170 A for full-load current in Equation (1)

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