PDH Online Course Description PDH Units/
Learning Units (Hours)
Practical Circuit Analysis

Richard W. Fruge, P.E. (Inactive)

Changes to power distribution system undervoltage relay settings often require the review of MCC motor starter coil pickup values on critical circuits. Facility loads that must operate should be evaluated for adequacy under all operational states. Component data must also be updated to reflect equipment changes or other facility modifications. Failure to review control circuit voltage calculations when the facility is modified can result in the failure of critical equipment to operate.

Design calculations prepared before the introduction of the personal computer often relied on the simplification of the analyzed circuits by the combination of series and parallel components into an equivalent circuit. Ohm's and/or Kirchoff's law was employed to analyze the circuit. These hand-written manipulations, although simple and straightforward, require numerous "hand" calculations that result in tedious, time-consuming verification and maintenance activities.

Section II demonstrates the analysis of a control circuit for a 480 V motor starter using the circuit reduction method used in many early (pre-PC) calculations. Section III demonstrates analysis of the same 480 V motor starter control circuit using mesh analysis techniques and Cramer's Rule. Section IV discusses calculation automation possibilities.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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