VARIAC TRIFASE SERIE T - ALIMENTATORI ELETTRONICI-VARIAC-TRASFORMATORI

Regolatori di tensione

Voltage Regulators
The autotransformer is an efficient, trouble-free device for controlling A.C. voltage.
Unlike most transformers, our voltage regulator has a transformation ratio that can be smoothly and continuosly changed so the output of the unit can be controlled from zero to line voltage or even higher.
Features:
EFFICIENT -transforms power more efficiently than rheostats
DURABLE -because it runs cool (40/50° C max)
OVERLOAD-ABLE withstands 1000% overloads short term
-Independent of load size or power factor - voltage to the load changes little from full load to none.
- Produce an adjustable output voltage that is a sine wave. Only the voltage magnitude is changed; the shape of the voltage is not distorted.
-Handle all load power factors.
-Can be used to adjust banks of capacitors and/or inductors.
Applications:
-Regulate voltage (over and under-voltage testing of electrical and electronic equipments).
- Speed control
-Lighting control in theatres, hotels, photographic studios
-Motor test stands
-Power supplies
-Industrial process heating control
-Source voltage & load banks for electrical testing:
• circuit breaker
• uninterruptible power supplies
• generators
-Control of D.C. voltage and current through rectifiers
-Control of rectifiers in electroplating etc.
-Supply voltage adjustment (automatic voltage stabilisers)
Construction:
Manufacturing standards
Designed and tested according to VDE-0552 and IEC 61558-2-14; designed as toroidal autotransformer.
Core
All regulators use grain-oriented strip wound silicon steel cores ensuring low losses and reduce magnetizing current.
Windings
The winding, wich is insulated from the core by precision moulded winding formers, comprises a single layer (class H wire) carefully wound to provide a flat surface for the brushgear.
Brushgear
Easily replaceable carbon brush units are used, the resistance of the brush being carefully calculated to limit the current circulating in the bridged turns.
It is therefore most important that only the correct replacement brush is used in any particular original's. Brushes are mounted in robust brush carriers insulated from the shaft, and designed so that metal parts cannot come into contact with the winding in the event of brush fracture.