Autotransformator 230/250 V, 8A
Tip produs: autotransformator ieftin | autotransformator variabil | autotransformator monofazatProducator: DISTEK
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Prezentare Autotransformator 230/250 V, 8A
High reliability
METREL variable transformers are practically maintenance free.
Long-life operation is assured with:
Precision winding
Surface forming of winding
Tight tolerances in preparing sliding track
Deep varnishing and baking also for fixing winding structure
A spring-loaded solid carbon brush
Power factor
Power factor of load has very little effect on the operation of a
METREL variable transformer in the range from 0.5 lagging to
0.5 leading. Like any transformer, the METREL variable transformer
reflects the load power factor to the line with very little
change.
Only for very light loads, possibly under 10%, will the lagging
power factor of the METREL variable transformer become significant
due to magnetizing current.
High efficiency
METREL variable transformers have low electrical losses under
all load conditions.
Efficiency is 98.5 percent at maximum output voltage selected.
This efficiency remains high, even at greatly reduced load
voltage.
Ambient temperature
METREL variable transformers are designed for continuous
operation in ambient of 0 °C to 40 °C, at full rated load. When
operated above 40 °C, the output power must be derated in accordance
with diagram 1. For example, when operating model
HSH 230/4 in a 60 °C ambient, rated output current would be:
70 % x 4 A = 2.8 A
Frequency
All METREL variable transformers are designed for operation at
50/60 Hz. They may be operated at higher frequencies, without
derating, however regulation becomes poorer. Units listed for
230 V operations may be applied on 115 V at 25 Hz, however
rated currents remain the same.
Linear output voltage
METREL variable transformers have the advantage of providing
output voltage that varies linearly in proportion to the angle
of rotation of the output voltage selector. Because of the large
number of increments of output voltage selection with the slider,
the output voltage is practically steeples.
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