Raju Loomba

Sector 59, Noida, Uttar Pradesh

Roller type servo voltage stabilizers are auto wound transformers having single layer helical-coil mounted on a conventional laminated core.    The transformer  assembly used consists of self lubricating carbon rollers assembled on bakelite carrier boards that traverse the length  of the coil track. The roller mechanism is driven by the servo motor which receives its signal from a voltage monitoring IC card on the  output side of the servo stabilizer. In our regulator, we use heavy section of electrolytic rectangular copper strip instead of copper wire  to minimize the losses and increase the efficiency of the equipment. Self lubricating carbon roller assemblies are used instead of  ordinary carbon brushes which offers more reliability and trouble free performance of the equi

Voltage fluctuation is a common phenomenon in every part of the country. Automatic Voltage Controller (Stabilizer) is an equipment to obtain constant voltage   tram flucfuating supply system. The industrial units running round the clock usually face the problem of low & high voltage. 90% of industrial load is of motors. Electric motors draw considerably high current at low & high voltage. This higher current affects the electric motors (particularly smaller capacity motors upto 7.5 H.P.) in these ways: . Higher current produce higher losses in Electric motors which cause premature failure of winding.     Higher current produce higher losses in Electric motors which cause premature failure of winding. These higher current of Electric motors also increase losses of Cables, Switches, Transformer & other associated equipments. This higher current of Electric motors require 15-20% higher setting of over load relay to avoid frequent tripping of motor's starter. Higher set­ting of over load relays have very little safety margin against single phasing and over loading conditions.     the installation of the stabilizer and maintaining 390/400 volts, the motor will operate smoothly drawing 15-20% lesser current and corresponding the relay setting can be reduced by 15-20%. In case single phasing occurs, the relay will trip in 40-50 seconds. The motor can withstand the high current for this period and will be safe. Also, the relays, contactors, switchgears , etc. incorporated with the motor will be safe.      Servo Stabilizers are available in a wide range and various models. The standard three phase models are suitable    for balanced & unbalanced supply and loads. The standard models confirm to the following specification :

Range :     200 KVA to 1600 KVA, 11 KV class. Applications : They are ideally suited for new residential and commercial complexes where in HT switch fuse unit, Transformer and LT switchgear are assembled together and transported as a unit. It is a tamper proof which eliminates any protective Fencing. Mainly used by power utilities, Multiplexes. Hospitals, Software Parks, Residential Complex etc.  announces successful development of packaged substation for urban distribution.

Features : Reduced maintainence Elimination of fire hazard Reduced cost of distribution of power Reduced space requirements Applications : Generating stations Atomic power stations Traction substations High rise buildings Petrochemical refineries Offshore drilling rigs Underground mines Marine applications

Types : Resistance furnace transformers Arc furnace transformers Induction furnace transformers Submerged arc furnace transformers Temperature class : 105/ 220 deg. C Either oil filled or dry type (upto 11 kV) Features : Special arrangement of tappings to get a wide range of secondary voltages and LT winding for large LT currents Either with on-load/ motorised off circuit tap changers Cooling arrangements like ONAN/ ONAF/ OFWF   Applications : Silicon carbide manufacture Steel melting Heat treatment Alumina manufacture