Section 5 – Operation

DANGER
hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E (NEC), NOM-029-STPS-2011, or CSA Z462. This equipment must be installed and serviced only by qualified electrical personnel. Perform such work only after reading and understanding all of the instructions contained in this bulletin. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electric power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of power system. Consider all sources of power, including the possibility of backfeeding. Always practice lock-out/tag-out procedures according to OSHA requirements. Carefully inspect your work area, and remove any tools and objects left inside the equipment. Replace all devices, doors, and covers before turning on power to this equipment. All instructions in this manual are written with the assumption that the customer has taken these measures before performing maintenance or testing. Failure to follow these instructions will result in death or serious injury.

DANGER

hazard of electric shock, explosion, or arc flash

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E (NEC), NOM-029-STPS-2011, or CSA Z462.
This equipment must be installed and serviced only by qualified electrical personnel.
Perform such work only after reading and understanding all of the instructions contained in this bulletin.
Turn off all power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electric power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of power system. Consider all sources of power, including the possibility of backfeeding.
Always practice lock-out/tag-out procedures according to OSHA requirements.
Carefully inspect your work area, and remove any tools and objects left inside the equipment.
Replace all devices, doors, and covers before turning on power to this equipment.
All instructions in this manual are written with the assumption that the customer has taken these measures before performing maintenance or testing.

Failure to follow these instructions will result in death or serious injury.

Effects of Humidity

The standard Encapsulating process does not support the growth of fungus. The only concern when units are stored in high humidity areas is retaining the integrity of the insulation material. if units are properly maintained and cleaned at shut down prior to long periods of de-energization there should be no issue with fungus.

Humidity conditions are unimportant as long as the transformer is energized. However, follow the precautionary steps listed below if the transformer is de-energized, is allowed to cool to ambient temperature, and will exceed a shutdown of 12 hours (especially in high humidity conditions).

Place small strip heaters in the bottom of the unit shortly after shutdown to maintain the temperature of the unit a few degrees above that of the outside air.
Inspect the unit for evidence of moisture before returning it to service.
Check the insulation resistance. if evidence of moisture exists, or if the insulation resistance is less than 1 megohm, dry out the transformer by placing it in an oven or by blowing heated air over it.

Enclosure Temperature

The temperature rise on the enclosure exterior for the Unit Substation should not exceed 149°F (65°C), as indicated in UL 1062.

WARNING
hot surface hazard Do not place combustible material on or near unit substation. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Energizing the Mini Power-Zone

Follow all safety precautions and requirements for PPE as outlined in NFPA 70E (NEC) and any other applicable standards and/or codes.
1. Immediately de-energize the Unit Substation if there is any indication of arcing (visual or audible) at any time during the initial start-up.
2. Investigate and correct the cause of the arcing before re-energizing the unit.
Investigate and correct sources of excessive noise. When energized, the Unit Substation will make some audible noise. Excessive mechanical noise, hums or rattles may be an indication of improperly installed or tightened hardware or enclosure parts.
Before energizing the Unit Substation, turn OFF (O) the primary main, secondary main and all branch circuit breakers.
Turn ON power to the Unit Substation and verify voltage measurements at the input of the primary main circuit breaker. Record and save the values for future reference.
Turn ON the primary main circuit breaker and verify voltage measurements at the input of the secondary main circuit breaker. Record and save the values for future reference.
1. TURN OFF POWER TO adjust the Unit Substation taps as necessary to match the actual voltage requirements. Refer to Primary Main Circuit Breaker Wiring for wiring diagram and tap chart.
2. Be sure to insulate all unused taps.
  
  NOTE: Do not change taps while the Unit Substation is energized.
Install the deadfront using the screws provided and torque to 20 lbs-in
(2.3 N•m).
Turn ON the secondary main circuit breaker.
Turn ON branch circuit breakers.
Close front cover and secure with screws provided and torque to 20 lbs-in
(2.3 N•m).