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ALTERNATOR

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ALTERNATOR

STANDARD

Evotec Power synchronous generators are designed and manufactured in compliance with IEC60034-1; IEC; GB755, BS4999-5000 and NEMA MG 1.22.

EvoTec Power machines are CE marking approved.

DYNAMIC BALANCING

The rotating part (rotor) is dynamically balanced with greater precision than that required by the standard IEC 60034-14 or ISO2372, ensuring minimum levels of residual unbalance.

OVERLOADS

The generators are capable of delivering an overload of 10% for 1 hour after 12 hours of running for Continuous Duty (S1). No overloads are allowed in Stand-by Duty.

THREE PHASE SHORT CIRCUIT CURRENT

EvoTec Power generators ensured a three phase short-circuit current higher than 3 times the rated current (>300%In)

INTERFERENCE

TIF value is <50 and THF is <2%

PARALLEL OPERATION

All generators are suitable for parallel operation with similar generators, when equipped with the parallel unit.

VACUUM PRESSURE IMPREGNATION (VPI)

Developed with the latest technology, the impregnation system by continuous flow is normally used by EvoTecPower for low voltage winding, ensuring perfect insulation and protection.

Besides the impregnation, the static windings receive a protection coating as an additional protection against infiltration of humidity, dust, etc. For bigger alternators, windings are impregnated with high quality material and using the latest Vacuum Pressure Impregnation (VPI)

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 windings offers simplicity, reduced overhangs, neat look while reduce voltage distortion and superior capability to cope with non-linear loads.

CONSTRUCTION

EvoTec generators are made according to the requirements of the standard IEC 60034-1.

Using the best quality standards during manufacturing, the result is safe operation and great durability.

Mounting styles normally supplied are 
     Single bearing with coupling by means of flanges and flexible disc
     Double bearing with coupling by means of flange
     Double bearing without flange

DEGREE OF PROTECTION

The generators are mechanically protected against finger touch, solid foreign bodies of diameter over 12mm and against vertical water drops, that is, protection rate IP21 as per standard IEC 60034-5.

VIBRATION AND NOISE

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

EXCITATION SYSTEM

The generators are self-exciting, by means of a brushless type excitation system.

The voltage is maintained within +/- 0.5% of the nominal value in steady state condition with a balanced and non-distorting load.

As an added option, EvoTecPower alternators line allowed the use of an auxiliary exciter with permanent magnet (PMG)

TERMINATION

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

TRANSIENT RATINGS

Transient voltage drop due to application of full load at 0.8 power factor is less than 18% output voltage recovers to within 3% of the rated value in less than 0.3 seconds.

INSULATION SYSTEM

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 generators applications.

EvoTec Power generators are of 2/3 pitch winding to reduce the voltage harmonic content in applications with non-linear loads

WAVEFORMS

The generators are designed to give an excellent output waveform. The total harmonic content of line to line voltage waveform on no load is less than 5% as per the limits specified by IEC Standards.

MANUAL VOLTGE REGULATION

EvoTec Power voltage regulators are equipped with an internal potentiometer with an adjustment regulation within +/-5% of the rated value. External potentiometer is available on request for possible remote voltage sensing.

BEARINGS

Bearings are dimensioned for heavy duty and generally oversized rolling bearings. All DE bearings are pre-lubricated for life.

RADIO INTERFERENCE

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

ASYNCHRONOUS MOTOR STARTING

1Hp for each kVA of the alternator can be started

MOTOR STARTING DUTY

Generally, each kVA of generatoris capable of starting 1 HP of induction motor.

ACCESSORIES / SPECIALTIES

Depending on the need or specification, accessories that allow greater flexibility in all application fields are optionally available, such as :

• temperature detector in the windings
• Temperature detector in the bearing
• space heater (dehumidifiers)
• Current transformer
• Protection IP23, IP44 and IP54
• Special coating scheme

VOLTAGE REGULATOR

The automatic voltage regulator (AVR) has a function called U/F which, when properly enabled, protects the alternator against operations below the rated speed, reducing the exciting current. A fuse installed in the terminal box or in the voltage regulator protects the generator against several abnormal situations during operation

SINGLE PHASE OPERATION

Three-phase (12 wire) wound generators can be re-connected and be de-rated by 33% for single phase usage. The following derating factors must be applied.