Electrical/Basic course
Motor protection circuit training

Motor is indispensable for factories. To ensure safe operation of motor, you will study the mechanisms including the following.
丂丒How is protective equipment of motor structured?
丂丒How are main protective devices of motor circuit structured? What are their operating principles?
丂丒How are protective devices of motor coordinated?
丂丒What are operating principles of instrument transformer and protective relay? How are they handled?

Operation characteristic test of protective relay Connection test for instrument transformer


Understand setting of protection circuit.
Curriculum
Schedule Subjects Contents
1st day Basics of motor Use real facilities (sectional models) to learn about structures of induction motor, rotating principles and reasons for motor overheating protection.
Basics of CB and its selection Understand structures/operations of circuit breaker and learn how to select CB (Standard operating responsibilities, %Z) and protection coordination of LV circuit.
2nd day Cable sizing亂Practical training亃 Acquire knowledge of cable sizing (voltage decrease, safe current and allowable current at short circuit).
Basics of protective relay Understand structures/operations of protective relay and study protection coordination of HV circuit that is essential for setting relay.
Operation characteristic test for protective relay亂Practical training亃 Conduct operation test to learn about basic operations and operation characteristics of protective relay.
3rd day Basics of instrument transformer亂Practical training亃 Conduct polarity test to learn about functions and handling procedures of instrument transformer.
Troubleshooting for motor protection circuit亂Practical training亃 Practical training on finding factors causing failures of motor circuit by using sequence diagram.


Training aids
Tools Specifications
Protective relay
Relay testing equipment Densoku Techno Co., Ltd., TPR-22B
Instrument transformer Mitsubishi Electric Corp., PE-14F, CW5LP

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