Product Card

Alternator Specifications
Brand Mecc Alte
Model ECP28-M/4
Voltage V 400
Frequency Hz 50
Power factor cos ϕ 0.8
Poles 4
Type Brushless
Voltage regulation system Electronic
Standard AVR DSR
Voltage tolerance % 1
Efficiency @ 75% load % 87.8
Class H
IP protection 23
Mechanical structure
Robust mechanical structure which permits easy access to the connections and
components during routine maintenance check-ups.
Voltage regulator
AVR - STANDARD
With this self excited control system the main stator supplies power via the Automatic
Voltage Regulator (AVR) to the exciter stator. The high efficiency semiconductors of
the AVR ensure positive build-up from initial low levels of residual voltage.
The exciter rotor output is fed to the main rotor through a three phase full wave bridge
rectifier. This rectifier is protected by a surge suppressor against surges caused, for
example, by short circuit.
Windings & Electrical performance
All generator stators are wound to 2/3 pitch. This eliminates triplen (3rd, 9th, 15th …)
harmonics on the voltage waveform and is found to be the optimum design for trouble-
free supply of non-linear loads. The 2/3 pitch design avoids excessive neutral currents
sometimes seen with higher winding pitches, when in parallel with the mains. A fully
connected damper winding reduces oscillations during paralleling. This winding, with
the 2/3 pitch and carefully selected pole and tooth designs, ensures very low
waveform distortion.
Insulation / Impregnation
The insulation system is class 'H'.
All wound components are impregnated with materials and processes designed
specifically to provide the high build required for static windings and the high
mechanical strength required for rotating components.
Reference standards
Pramac Alternators meet the requirements of BS EN 60034 and the relevant sections
of other national and international standards such as BS5000, VDE 0530, NEMA
MG1-32, IEC34, CSA C22.2-100, AS1359.