General Data

OPERATING IN DIFFERENT ENVIRONMENTS

  • For use of the AC Generator at altitudes higher than 1000 m. above the sea level, it is necessary to derate by a factor of 4% for every 500 m above 1000 m
  • If the ambient temperature exceeds 40 deg. C, the derating factor to be incorporated is 4% for every 5 deg. C of increase.

STANDARDS COMPLIANCE

  • IEC : 34
  • BS : 5000 (Part 99)
  • EN : 50081
  • IS : 4722 & 13364 (Part I & II) with CE mark for brushless designs.

MECHANICAL FEATURES

  • Aluminium frame die - cast stator upto 200 and steel stator for higher frames.
  • Sturdy cast iron endshields fixed on to the stator frame by high tensile screws.
  • High quality steel shafts are amply designed to take care of overload and short circuit stressed conditions.
  • Sturdy, dynamically balanced rotors are designed for withstanding the runaway engine speed and are with continuous damper cage for high performance under arduous conditions of parallel operations.
  • Aluminum fans for effective cooling extends the winding life.
  • Screens or louvered covers on all openings for safety.
  • Easy mount SAE adaptors are offered with single bearing AC Generators to simplify coupling with popular engines.

AUTOMATIC VOLTAGE REGULATOR (AVR)

  • Under Speed Protection with LED indicator.
  • Over Excitation Protection with LED indicator
  • Designed for Thyristor load without additional filter circuits.
  • Moulded construction for protection against shocks, vibrations and adverse atmospheric conditions.

UNDER SPEED PROTECTION (with AVR)

Protects both the AC Generator and V/f sensitive loads. The AVR has provision for setting the frequency below which voltage dropping occurs linear to speed. This feature also enables the prime mover to recover the speed faster during motor starting

WINDING AND INSULATION SYSTEM

The armature coils of the stator main winding are made from dual coated, class 'H' copper wires, Single / Double Layer concentric fractional pitched winding offers simplicity, reduced overhangs, neat look while reducing voltage distortion and superior capability to cope with non-linear loads. The auxiliary winding in stator provides power to the AVR, improving the motor starting capability of the AC Generator.

The insulation system is class 'H'. All wound components are impregnated in an unsaturated polyester resin of 200 class temperature. The impregnation provides much needed rigidity and protection against the harsh environment, typical for the AC Generators applications

RADIO INTERFERENCE

The AC Generators are having negligible Radio Frequency Interference and meets in general the limits permitted by VDE 0875 (N)

WAVE FORMS

A.C. Generators are designed to give an excellent output wave-form. The total harmonic content of line-to-line voltage wave-form on no load is less
than 5% as per the limits specified by IEC/IS Standards.

OVERLOADS

A.C. Generators are capable of delivering an overload of 10% for one hour after every six hours of running.

MOTOR STARTING DUTY

Each kVA of AC Generator is capable of starting 1 HP of Induction Motor with use of auxiliary winding except for Submersible Pump & Lift Duty applications. (Upto 200 frame only)

VIBRATION AND NOISE

CNC machining with close tolerances and repeat Accuracy for uniform air - gap and rotor dynamic balancing for low vibrations ensure efficient, smooth and silent performance.

TERMINATION

  • Integral Terminal Box is provided for higher reliability.
  • Top Terminal Box with side cable entry ensures wiring flexibility.
  • Spacious terminal box accommodates all types, including aluminum cables