Test equipments for power generation systems

AC Loads




GENERAL FEATURES

Loads are built in cabinets of galvanized sheet metal or powder coated, suitable for outdoor installation, with resistors made in stainless steel and cooled by forced ventilation and low losses tropicalized inductors.

An efficient heat dissipation is a very important factor to get the steadiness of load, since the power absorbtion of resistors decreases with the increasing of temperature. The cooling fans installed in our equipments are characterized by a plentiful airflow in order to reduce the thermal drift of resistors, so the load power is mantained stable even over long duration test sessions.
When load power is fully disconnected, the fan stop is delayed, to ensure a more gradual cooling of resistors and extend their working life.

Thanks to a peculiar internal design the side walls do not reach dangerous temperatures.

The load banks are conceived to be modular, so it is possible to combine several loads together to achieve the necessary power, or add later other load banks to enlarge a configuration already existing.

Safety Outfitting


Fault type Protective device
Protective device consequence
Resistors short circuit
Set of three fuses for each load step
Reduction of active power, usually in unbalanced way
Resistors overload
Unnecessary
--
Inductors overload or short circuit Three-poles automatic circuit breaker for each load step Reduction of reactive power
Partial airflow lack Thermal protection switch
Instantaneous disconnection of the whole power
Full airflow lack (optional) Differential pressure switch
Instantaneous disconnection of the whole power
Fans overload or short circuit Adjustable motor protection circuit breaker Instantaneous fan stop
Instantaneous disconnection of the whole power
Emergency stop Red push-button with rotary unlocking Instantaneous fan stop
Instantaneous disconnection of the whole power
Intrusion alarm (optional) Door microswitches on doors and sheet panels Instantaneous fan stop
Instantaneous disconnection of the whole power

Injuries caused by direct contact with potentially dangerous mechanical parts Protection net in front of fan impeller
Grids or protection nets on all dangerous accessible openings
Permanent upkeeping of safety distances from hazardous parts (barriers)


  • Typical application areas: AC power generation, power dissipation.