Schneider METSEPM8243 - PowerLogic PM8000

EXNEnergyEfficient Transformer Family

Square D transformers manufactured by Schneider Electric™ are optimized for

performance, including the following components:

• Coil—Designed to reduce the losses with customized wire configurations used

exclusively by Schneider Electric. Computer-controlled winding equipment

minimizes variability during the winding process. Aluminum conductors are

standard with copper conductors available as a factory option.

• Insulation System—The system consists of a conductor wrap or coating, layer

insulation, air gap spacing, and varnish material. The system is UL listed for a

specific maximum temperature for average temperature rise, hot spot, and

ambient temperature. Schneider Electric’s EXN family of transformers have a

428°F (220°C) insulation system, with an average temperature rise maximum of

302°F (150°C).

• Core—EXNTransformers are designed with high-grade grain oriented, non

aging silicon steel laminations with high magnetic permeability, low hysteresis,

and low eddy current losses. The computer-aided process allows the design to

keep the magnetic flux densities well below the saturation point. The laminations

are carefully and evenly stacked via distributive gap laminations, then clamped

together to ensure an efficient magnetic circuit while providing a quiet quality

offering of low voltage transformers.

• Terminals—Sized to allow the lugs to align with all corresponding Schneider

Electric equipment (such as circuit breakers, switches, panelboards,

switchboards, etc.). The terminal positioning separates the Primary and

Secondary terminals and meets the National Electrical Code® (NEC®) minimum

wire bending requirements. Lugs are not shipped with the transformer. This

allows the installer the flexibility to order what is needed to meet any distribution

system requirements. NOTE: Both mechanical and compression lug kits are

available from Schneider Electric.

The Square D™Distribution Transformer is designed to supply power throughout the

building. The transformer permits the use of multiple voltages in the design of the

system.

Someadvantages to designing a system with low voltage transformers:

• Distributes a voltage higher than required by the load to limit wire losses and

voltage drop

• Addition of source impedance to the system, reducing common overcurrent at

normal voltages

• Mitigates harmonics through an internal magnetic circuit

• Allows system grounding closer to the load, reducing capacitive noise

• Canbedesignedfor any output voltage that is required.

Afew disadvantages to designing a system with low voltage distribution transformers:

• Reducesoverall efficiency of the system due to internal losses within the

transformer

• Addedheattothe building if installed indoors and in the HVAC system.

The impact on the efficiency of the system and the concerns for improvements in the

market for energy consumption have led to low voltage distribution transformers being

regulated through the Energy Policy and Conservation Act (United States) and

Natural Resources (Canada).