Automatic Voltage Controller (Stabilizer)

 ROLLING CONTACT SERVO CONTROLLED AUTOMATIC VOLTAGE CONTROLLER (STABILIZER) Capacity: 30 - 5000 KVA LT/HT

Voltage fluctuation is a common phenomenon in every part of the country. Inspite of best efforts, no state electricity board can ensure constant voltage to the customer because of long and inadequate distribution lines and irregular load pattern on distribution lines and irregular load pattern on distribution transformers. Automatic Voltage Controller (Stabilizer) is an equipment to obtain constant voltage from fluctuating 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 in these ways :


Higher current produce higher losses in Electric motors which cause premature failure of winding.


These higher current of Electric motors also increase the losses of cables, Switches, Transformers & other associated equipment.


This higher current of Electric motors require 15-20% higher setting of over load relay to avoid frequent tripping of motors starter. Higher setting of over relays have very little safety margin against single phasing and over loading conditions.


With 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.Description of GLOBE Servo Controlled Automatic Voltage Controller : GLOBE Servo Stabilizer primarily consists of the following :


Linear, plus/minus type vertical Rolling Contact Voltage RegulatorIn our Regulator we are using heavy section of electrolytic rectangular copper strip instead of copper wire to minimize the losses & increase the effiency of equipment. We are also using self lubricating Carbon Roller assemblies instead of ordinary carbon brushes which offers more reliability and trouble free performance of the equipment.


Double Wound Buck/Boost type Series Transformer In our Buck/Boost transformer we are using CRGO lamination to minimize iron losses and coils of Buck/Boost Transformer are wound with heavy section of multi strips electrolytic copper to minimize copper losses for getting better efficiency of the equipment.


Electronic Control Circuit and meter panelGLOBE Automatic Voltage Controller consists of very simple electronic control circuit for monitoring and controlling voltage, repair & maintenance of which is very easy.


The regulator and Buck/Boost transformer are oil cooled, housed in same or seperate sheet steel tanks. Radiators are provided for effective cooling. The coils of voltage regulator & Buck/Boost Transformers are vaccum impregnated and oven dried as per IS.
The table below gives approximate quantitave advantages of Automatic Voltage Controller at Various fluctuation levels.





Input Voltage Variation


%Reduction in Breakdown Possible


Approx. Power Saving Possible





Motor Load


Lighting Load


Motor Load


Lighting Load




380-400 volts


Nil


Nil


Nil


Nil & No Servo Stabilizer Required




380-420 volts


5%


10%


3%


5%




380-440 volts


10%


20%


5%


10%




380-460 volts


40%


40%


7%


20%




380-480 volts


60%


60%


10%


30%






TECHNICAL SPECIFICATIONS
GLOBE 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 specifications :




Input Voltage





360-450 V,


350-450 V,


340-460 V,


340-480 V,


320-460 V,


300-460 V,







Efficiency (Approx.)





99.5%


99.3%


99%


98.9%


98.7%


98.5%







Output Voltage
400 V 1%, 3 Phase, 50 Hz.


Cooling
Naturally Oil Cooled


Type
Indoor


Temperature Rise (Max.)
30 C above ambient


Mounting
On Uni-directional Wheels


Wave form distortion
Virtually Nil


Duty Cycle
100% Continuous




Note : Nonstandard input and output models are also available against specific requirements.
BENEFITS OF INSTALLING AUTOMATIC VOLTAGE CONTROLLER ON LIGHTING LOADBy maintaining 365-380 / 210-220 volts, Three / Single phase output through Automatic Voltage Controller for Lighting Load, there will be definite saving of power bill & reduction in failure rate of lighting equipments. Higher the input voltage - more wil be the savings. The overall effect on the brightness of the lamp at 210 / 220 volts will be negligible.
APPLICATION
Through stabilizer are useful for any kind of application, these are most suitable for 24 hour continuous process plants where breakdown due to fluctuation results in heavy financial losses. These include :





Cement Plants

Tube Mills
Hospitals


Flour Mills
Rice Sheller's
Nursing Homes


Engineering Units
Rubber Industries
Clubs


Pharmaceutical Units
Tea Estates
Hotels


Cold Storage
Food Processing Units
High Rise Buildings


Rolling Mills
Oil & Vanaspati Plants
Export Houses


Textile Mills
Footwear & Leather Units
Call Centres


Paper Mills
Distilleries & Beverages