Voltage Controllers

AUTOMATIC VOLTAGE CONTROLLER (SERVO VOLTAGE STABLIZER) Inner View of Unbalanced Type AVR Save Energy Save Money Install GNEW Make Rolling Contact Type Automatic Voltage Controller. All electrical equipments & machines are designed and manufactured in India at 400 volts (Three Phase) / 230 volts (Single Phase). Power is supplied to the consumers at these standard rating, but due to technical limits & commercial inbiabilities it is not possible to supply power at the above mentioned rating and a wide spectrum of voltage variation is witnessed. The problem is more acute where cluster of industries exists which causes considerable losses, directly due to over drawing of current and indirectly due to breakdown in Machines, interruption in production process and it's bad effects on quality of products. If you are getting lesser or more than 230 volt single phase or 400 volt in three phase Then you can save substantial amount of money by getting constant voltage by installing of GNEW make Rolling Contact Type Industrial Automatic Voltage Controller.   Balanced Type AVR Carbon Roller Inner view of AVR ADVANTAGES Reduction in Breakdown of the electrical equipment. Energy Saving 5 % to 10 % possible Improvement in power factor Reduction in MDI 100 % depriciation as per income tax Act. Chart depicting Reduction in Break down at different voltage level Input Voltage Variation Possible Reduction in Break down of Electrical Equipments Approximate Power Saving (Mainly at Higher Voltage) 380-420 Volts Normal Fluctuation Stablizer required only for Computerised CNC Machines or for Lighting System 360-440 Volts Upto 20% reduction in Break down of electrical equipments Power Saving upto 5% 340-460 Volts Upto 60% reduction in Break down of electrical equipments Power Saving upto 7% 320-480 Volts Upto 80% reduction in Break down of electrical equipments Power Saving upto 10% The nagative impacts of higher voltage on motor below 10 HP are very much apparent as given in the following table. The table below compares the behavior of 5 H.P. Motor at different voltage. Input Voltage Current Consumption KVA PF 400 11Amp 7.6 0.8 420 10% more 16% more 0.7 440 20% more 40% more 0.61 460 30% more 49.8 % more 0.57 1.     It is clear from the above chart that with the increase in supply voltage the input current also increases and the power losses also increases in motors which results in premature failure of winding. 2.      This increased current of electric motor results in over loading of cables, switch gears and transformers. 3.      Due to increase in current the Power Factor of the system decreases, which needs extra capacitors to maintain the P.F which results in over loading of switch gears etc. The higher voltage highly effects the life and lumination of lighting equipments. If the lamps are provided according to higher voltage then illumination decreases during the normal voltage period. Table below gives the lumens and life characteristic of 60 watt coil lamps at different voltage rating. Lamp rating Lumen & life at 230 V Lumen & life at 240 V Lumen & life at 250 V 230 V 60 W 710.lumen 1000 Hr 820.lumen 575 Hr 943.Lumen 338 Hr 240 V 60 W 605.lumen 1740 Hr 700.lumen 1000 Hr 804 lumen 528 Hr 250 V 60 W 523.lumen 2956 Hr 605. lumen 1700 Hr. 695 lumen 1000 Hr. It is interesting to note that if a bulb designed for 230 v operated at 230 v or 240 v  lamps operated at 240 v or 250 v lamps operated at 250 v give comparable performance in respect of lumens out put & life. The information given in the table reveals the way how a 230 v lamps would perfom when opretered at 240 v & 250 v. At higher voltage, though the lumens of bulb increases but life decreases considerably. Therefore the life and efficiency of the lighting equipment will be maximum if the voltage supplied to it is accroding to the rating of lighting equipment. From the above mentioned observation it is clear how important is the installation of the stabilizer and maintainting 400 v / 230 volts. The Motor, lighting equipment and other electronic equipment will operate up to their maximum efficiency, consuming normal power as per rating and we can avail optimum life of motors and switchgear. The Table below compaires the behaviour of 60 watt lamp (design for 230v) at different voltage Voltage Current in Amp. Watts consumed Luminous Intensity Life in Hours 230 0.26 60w 710 1000 240 0.27 64w - 8% more 820 575 250 0.28 70w - 16.6% more 943 338 260 0.29 75.4w - 25.6% more 1073 200 270 0.31 83.7w - 39.5% more 1213 100 Advantage of AVR than Transformer with OLTC: The unit which have already installed OLTC with their transformers also required stabilizer because tapping of OLTC is changed when problem of very high or low voltage is observed, on the other hand AVR Moniter and Control output voltage continuously. However in case of already installed transformer with OLTC the input range of stabilizer can be kept low. Comparision with Conventional Type AVR GNEW MAKE AVC Conventional Stabilizer Life is 15-20 years Life is 2-3 years Efficiency (99 to 99.5%) Efficiency 95 to 97 % Suitable for 100% load Only 30-40 % load capacity Components GNEW Servo voltage stabilizer consists of the following items :- 1.    Linear type, plus / minus type, vertical rolling contact type regulator The voltage regulator is a continuously tapped auto transformer with core and coils similar to those of an orthodox thransformer. A mainframe supporting the completely insulated coils and is housed in an oil cooled sheet steel tank. Carbon Rollers move on both sides of the winding, in opposite direction, to increase or decrease the incoming voltage. The effect is to produce a variable voltage of either negative or prositive polarity, which is injected into the buck boost double wound transformer. The contact carrier is driven by a fractional horse power high torque motor which is coupled to the chain drive. Limit Switches operated by the carrier are fitted, to prevent overrun. 2.      Double wound buck / boost transformers Buck-Boost Transformer. - This is a conventionally designed double wound tranformer housed in regulator tank or separate sheet steel tank and it confirms to the latest Indian standards. The secondary of the buck boost transformer is connected between the mains and the load while the primary has its voltage controlled by the motor driven regulator. A Voltage of either positive or negative polarity, as the case may be, fed to the primary. It induces the same to the secondary thus adding to or substracting from the incomming line voltage.     3.      Electric control circuit and meter panel  Control Panel - It is mounted on the top of the Servo Voltage Stabilizer. A voltmeter and an ammeter are incorporated in the panel to read output voltage and load current reading. Two switches, one for auto / manual mode and other for increasing/decreasing the voltage on manual mode are provided. A potentiometer is also provided to set the voltage to required output at Auto Mode. A solid state sensor unit (IC Based) continuously monitors the output voltage from the stabilizer and any error in voltage is amplified to operate the high torque servo motor in the variable transformer. Secondary Components 1.      Indicating & Measuring Equipments :-                 (a) Volt meter analogs / digital type, indicating input and ouput volts.         (b)  Ammeter analogs/digital type, indicating input & output current. 2.      Mode switch for manual or Automatic Mode Selection 3.      Out put volt selectability level switch 4.      Senscetibity level selectability switch 5.      MCB Box provided for control panel Optional but user friendly Features / Components. 1.      Over load protection, thermal or solid state to switch off unit if the load attains higher value than the rated current. 2.      Over and under voltage protection can be provided to switch off unit if the out put voltage found above or below certain value (preset). Ranges & Models Single Phase - 3KVA to 30 KVA Three Phase - 20 KVA to 5000 KVA Types - Balance Type & unbalance type Efficiency Chart input / output chart Input voltage 360-460 Volts 340 - 460 Volts 320 - 480 Volts 300 - 480 Volts Efficiency Above 99.5% Above 99.3% Above 99% Above 98.5% Application : - Every type of Industries can be benefited by its application but the plant running for 24 hours can achieve wonderful advantage by instalation of automatic voltage controllers. Textile & Hosiery Mills Engineering Units FoodProcessiy units. Residential Complex Hotels Hospitals. Rolling Mills Oil & Vanaspati Plants Solvent Plants. Rice Shellers Paper Mills Rubber Industries. Clubs Flour Mills Tea Estates. Tube Mills Footwear & Leather Units etc.