GE Industrial Solutions Dry-Type General Purpose Power Transformers - Manual (Page 2)

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General Information
General-purpose dry type transformers have a ventilated, encased construction suitable for indoor service only unless converted for
protective outdoor service. All models are designed for floor or platform mounting. The core and coil structure is mounted directly
to the enclosure allowing all-around and floor access for cabling. Rubber isolation pads are included as a kit and can be mounted at
the base to minimize transmission of vibration. An optional bottom panel has to be in place for wall-mounted transformers;
however, the bottom panel installation is optional for transformers mounted on flat non-combustible surfaces.
Rain-shield conversion kits are available to convert standard indoor NEMA Type 2 enclosures to NEMA Type 3R enclosures
suitable for protected outdoor installation. The transformer nameplate specifies the proper kit to match the indoor enclosure and
transformer. The enclosure has vent guards that deter rodents, birds or debris from entering.
Each transformer is assembled and given complete electrical tests at the factory, after which it is inspected and packed for shipment.
1. Temperature Class
Industry standard UL 1561 classifies insulation systems in accordance with the following rating system:
Ambient + Winding Rise + Hot Spot = Temp Class
40C 55C 10C 105C
40C 80C 30C 150C
40C 115C 30C 185C
40C 150C 30C 220C
All standard, general-purpose transformers meet applicable
IEEE, ANSI, NEMA and UL standards.
These transformers are designed using a 220C insulation
system with a standard 150C temperature rise.
Transformers for applications requiring lower temperature rise, generally 115C and 80C, are readily available.
Transformers with a standard 150C winding temperature rise, operating at full load will have a maximum 50C/122F temperature
rise on the surface areas of the enclosure. With a 40C ambient, the measured enclosure surface temperature could be as high as
90C/194F.
3. Handling
Provisions for lifting are provided. Because transformers are surprisingly heavy, check the weight shown on the nameplate or the
shipping label to assure adequate capacity of lifting equipment. For safety, spreaders should be used with lifting equipment.
CAUTION
THE ENCLOSURE IS AN INTEGRAL PART OF THE STRUCTURE SUPPORTING THE TRANSFORMER. NEVER LIFT
THE UNIT WITHOUT THE ENCLOSURE IN PLACE (OTHER THAN THE COVER WHICH HAS TO BE REMOVED TO
ACCESS LIFTING HOLES ON TOP CORE CLAMPS). ALWAYS MOVE TRANSFORMER IN AN UPRIGHT POSITION.
To move unit with a pallet jack or fork truck, remove the four bolts on front and rear lifting grills, reattach the lifting grill in the
raised position (using bottom holes in the grill) and lift on both grills. When transporting is complete, return lifting grills to the
lowered position. Refer to enclosure assembly picture on last page.
4. Receiving
Upon receipt of shipment, examine the unit for damage that may have been sustained in transit. If the shipping packaging must be
opened outdoors, take proper precautions to prevent the entrance of moisture. While unpacking, examine the product for broken,
bent, or loose parts or other damage. If damage from shipment is evident, file a damage claim with the transportation company and
notify the nearest sales office.
5. Installation
Dry-type transformers should be located in an area where the transformer can be inspected at any time. It is a requirement of the
National Electrical Code that sufficient access and working space be provided and maintained about all electrical equipment to
permit maintenance.
WARNING
TO AVOID ELECTRICAL SHOCK DO NOT REMOVE COVERS WHILE TRANSFORMER IS ENERGIZED.
TRANSFORMERS OPERATE AT HAZARDOUS VOLTAGES THAT COULD CAUSE SEVERE INJURY OR DEATH!