Electrical equipment is selected by a design engineer for a specific purpose. This includes operating within the manufacturer’s specifications, as well as how it functions within the system.
For newly installed equipment, it is important for NETA Certified Technicians to critically verify that all aspects of the equipment work as intended to ensure proper and reliable operation of the electrical system.
1. During commissioning of a new circuit breaker, which of the following should be verified against the engineered single-line diagram?
a. Contact operation timing
b. Nominal current
c. Contact resistance
d. Insulation resistance
2. During acceptance testing, a single line may indicate the CT ratio plus which of the following?
a. BIL rating
b. Insulation rating
c. Percent accuracy
d. C classification
3. When testing the relay, breaker, and current transformers after commissioning, which overall test can be performed to ensure all devices function together?
a. Wiring check
b. Primary current injection
c. Burden check
d. Tightness verification
4. Which transformer rating can be verified during commissioning and then added to the single-line diagram?
a. Percent impedance
b. Voltage ratio
c. Phase shift
d. Tap position
5. Which cable test applies a higher voltage for acceptance testing and a lower voltage during maintenance?
a. Phasing check
b. Withstand
c. Insulation resistance
d. Shield resistance
6. When commissioning protective relays, which verifications would NOT need to be confirmed to be accurate on the single-line protection diagram?
a. Tripping indication
b. Relay name
c. Firmware version
d. ANSI device numbers
7. When commissioning circuit breakers and protective relays, which of these checks does NOT ensure they operate together?
a. Functional trip
b. Primary current injection
c. Schematic control checks
d. Confirming the same manufacturer
Morgan Gieni, CET, PSE, is the Technical Support Lead — Technical Field Services (TFS) at Magna IV Engineering. He is a Certified Engineering Technologist through ASET — The Association of Science & Engineering Technology Professionals of Alberta and a Power System Electrician. Gieni has extensive knowledge and experience regarding the commissioning, repair, and maintenance of electrical power systems equipment. He has spent the past few years of his career building technical training programs, providing technical support, and mentoring field service employees. Gieni holds NETA Level IV Senior Technician Certification and is on NETA’s Technical Resource Committee.