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 Regulator
  In 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 panel
  GLOBE 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.

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 :

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 :