High Voltage Motor Control Gear Electrical Testing.

Testing high voltage motor control gear is essential to ensure the safety, reliability, and performance of electrical systems.

HV Motor Control Gear Visual Inspection.

Visual inspection of high voltage (HV) motor control gear is crucial to identify any physical defects, damage, or irregularities that may affect its performance or safety.

1. Inspect primary and auxiliary equipment for physical damage, missing parts and proper assembly.
2. Compare equipment nameplate data with one-line, design plans and starter schedule.
3. Check nameplate voltage and current ratings for breakers, contactors and primary and secondary fuses.
4. Compare overload protection with motor full load current for proper sizing.
5. Verify component sizing versus load.
6. Check contactor finger stab alignment and tightness on draw-out designs.
7. Protective grounding is correctly installed and connected to main ground.
8. Remove shipping and blocking material from starter and vertical sections.
9. Check draw-out cubicles and wire ways for cleanliness.

Mechanical Inspection.

Mechanical inspection of high voltage (HV) motor control gear is essential to ensure its structural integrity, proper functioning, and reliability.

1. Torque all accessible bolted connections.
2. Check insulators and the insulation system.
3. Inspect main bus and bus taps to switches and potential transformers.
4. Manually operate breakers and contactors. Check for freedom of movement of all moving parts.
5. Check for main contact pressure alignment and full contact area on contactors.
6. Check operation of door mechanical interlocking linkage.

Electrical Inspection.

Electrical inspection of high voltage (HV) motor control gear is crucial to ensure its safe operation, compliance with standards, and prevention of electrical hazards.

1. Check wiring point to point and megger.
2. Check wire markers, and that terminal block connections are secure and properly identified.
3. Megger and high potential test main bus phase to ground and phase to phase.
4. Measure bus resistance and joint contact resistance.
5. Inspect all protective relays and devices for correct operation and settings.
6. Check to see that space heaters are connected and operable.
7. Megger outgoing circuits.
8. Check PT and CT rating, ratio, and insulation resistance, test in accordance with procedures.
9. Check calibration of voltmeters and ammeters.
10. Check rating of all fuses.
11. Verify relay trip/alarm functions.
12. Verify motor ground fault protection.
13. Check effectiveness of tripping devices.
14. Megger contactors and circuit breakers phase to phase and phase to ground.
15. Measure the contact resistance of each contactor and circuit breaker.
16. Check the Phase Rotation of the voltage on the main bus.

Nameplate Information.

Equipment Identification/manufacturer.
Serial number/model number.
Rated Voltage.
Rated current.
Interrupting Rating.

(Test performed in accordance with values recommended by vendor or values in international Standard/Codes.)

Motor Control Center Megger Test Form.

ITEMS TESTED	MEGGER TEST	DC HI-POT LEAKAGE
	Insulation resistance in Meg-ohms	Current in micro-amps
Phase A to Ground.
Phase B to Ground.
Phase C to Ground.
Phase A to Phase B.
Phase B to Phase C.
Phase C to Phase A.

Motor Control Center Contact Resistance Form.

Feeder No.	Breaker or Contactor No.	Phase A Line to Load micro-ohms.	Phase B Line to Load micro-ohms.	Phase C Line to Load micro-ohms.

Motor Control Center Data Sheet.

Voltage Rating:

DEVICE NO.	HORSE POWER	FULL LOAD CURRENT	MOTOR PROTECTION RELAY TYPE	RATING	FEEDER NO.	FEEDER INSULATION RESISTANCE