Industrial Transformers
In spite 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 transformers. Generally Voltage is low during day time and high during night hours. Moreover on holidays, peak hours, rainy days and when agricultural and Industrial load is switched off, the voltage rises sharply which is more dangerous. This higher current affects the electrical motors (particularly smaller capacity motors upto 7.5 H.P.) in three ways: 1. Higher current produces higher losses in electrical motors which causes premature failure of winding. 2. These higher losses of electric motors also increase the losses of cables, switches, transformers & other associated equipments. 3. For smooth continuous operation of motors, over load relays are usually set at 20% higher setting. With the installation of the Servo Controlled Voltage Stabilizer and maintaining 390/400 volts, the motor will operate smoothly drawing 15 - 20% lesser current The table below compares the behavior of 5 H.P. motor at different voltage:
The table below compares the behavior of 60 watt lamp at different voltage:
and correspondingly 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. Loss Comparison of Servomax Make Regulator & Conventional make Regulator
Table below gives approximate quantitative advantages of automatic voltage controller at various fluctuation levels:
Description of Servo Controlled AVC: Servoamx ,Servo Stabilizer is manufactured as per IS : 9815 and primarily consists of the following: 1. Liner Plus / Minus Type Vertical Rolling Contact Voltage Regulator In our regulator we are using heavy section of electrolytic grade rectangular copper strip instead of copper wire to minimize the losses & increase the efficiency 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. ![]() 2. Double Wound Buck / Boost Type Series Transformers 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. 3. Electronic Control Circuit and Meter Panel Servomax's 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 separate sheet steel tanks. Radiators are provided for effective cooling. The coils of voltage regulator & Buck / Boost Transformers are vacuum impregnated and oven dried as per IS. Superior Features Of Servomax Make AVC.Temperature Rise It is designed for 30-35 degree C above ambient. Suitable for any kind of ambient temperature conditions. Core Core is constructed from Low Loss of CRGO M-4 Grade confirming to latest standards & is fitted & clamped with special built in-house frames to reduce the magnetic noise & to make the structure rigid & robust. Windings Use paper covered electrolytic grade copper strip for winding. Cooling ducts are provided to keep the hot spot temperature as low as possible. Tanks & Paint Tanks are made of M.S. Sheets with adequate bracing & stiffeners are given a coat of Epoxy Primer & Epoxy paint for better life. Both light grey & Siemens grey (RAL 7032) are available in colour.Oil Oil of IS: 335 standard is being used & is filtered before topping. Technical SpecificationsSERVOMAX Servo Stabilizer are available in wide range & various models according to customer’s requirement for Balanced / Unbalanced supplies with following specifications:
Advantages
Payback PeriodIt has been assesed with long experience & customer’s feedback that the payback period of Automatic Voltage Controller is well within 6-12 months depending upon the site conditions. |
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