Servo Stabilizers : Industrial Electrical Corporation

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Servo Stabilizers:

We generally observe that, AC main supply is never 230 Volt or 415 Volt, but varies from 150 Volt - 300 volt and 300 Volt - 500 Volt. It's a very common phenomenon, in India as well as most of the developing countries. The difficulties caused by them are well known, such as Over Load Condition, Line Losses, Poor Power Factor and several other reasons. Generally constant voltage which is required to load is never constant, but in fluctuation manner. It is observed that during the day time, the voltage is quiet low and during the night the Voltage is high then the normal. This fluctuation in supply system results frequent breakdown, low production and also loss of energy.

 

Now the power agencies insist the consumer to fix the capacitor to improve power factor and we get better results in power saving. But Voltage is also important factor to save the power loss. Technical institute and other aspects that illumination (Lighting) is working very very efficiently at 220 V AC with minimum power consumption and longer life. Same way motor transformer heating equipment's are working very efficiently at 400 V AC with minimum power consumption and longer life without breakdown by use of a Servo Stabilizer. All your connected load can be distributed from one stabilizer, instead of using individual stabilizer on each load.

All the above features are available on our IEC Servo Voltage Stabilizer.

 

General

  • "IEC" stabilizer comply IS 9815 - Automatic line voltage corrector and latest amendments.

  • It is Automatic line Voltage corrector using synchronous motor in close loop control. The stabilizer employ continuously variable auto transformer, buck-boost transformer, AC synchronous motor, state of the art IC closed loop control system with all protection, metering, indication and control system to give desired output voltage within the specified limits for a range of input voltages.

  • Provision for manual correction of voltage also be provided.

Features

IEC Servo Controlled Voltage Stabilizer is Designed & Manufactured as per ISI specification by Skilled Engineers. It is a reliable product for stable supply. It's fast correction ratio against quick voltage fluctuation ensures trouble free operation for high precision Electrical & Sophisticated electronic equipments. Sitting in fully Ventilated sheet metal cabinet sprayed with lacquer finish paints. It's rugged build & sleek looks make it a truly top-of-the-line product.

Control Panel

  • The stabilizer control panel is provided with louvers for proper ventilation and the openings is covered with 2mm thick neoprene gasket for dust proof. Outdoor type stabilizers have IP 54/55 protection against solid and liquid ingress

  • The control panel is fixed on the top pf auto-stat housing to give a compact design. Proper room for removing and repairing the components is provided. The wiring is neatly done and the components are logically arranged for easy phase wise identification and firmly interconnected.

  • The closed loop control circuit is of state-of-the art technology and IC based. All Electronic components used of high quality and properly soldered for long hours of continuous trouble free operation at specified site condition. PCBs compactly designed and fixed in such a manner that it can be easily removed and reconnected.

  • All meters, status / trip indications, control switches etc are placed in front of the control panel and logically arranged phase wise for easy understanding & operation. All indications are of LED type.

  • Cables contractors and windings carrying the load current are properly design for its duty and current rating. Gear arrangements are properly aligned to give smooth, free low noise operation with minimum friction. AC synchronous motor Stepper motor have high torque/power ratio to achieve high efficiency of the stabilizer.

  • The carbon brush of the autostat function for long period without wearing and a spare brush provided inside the autostat for immediate replacement.

Efficiency & Regulation

  • The stabilizer have efficiency better than 95% at full load and voltage regulation of +/-1% from specified voltage from no load to full load.

Control

Auto/Manual control:

  • A toggle switch is provided to switch the stabilizer on Auto or Manual mode.

  • In Auto mode the output corrected automatically in closed loop control to give the specified output Voltage. Provision to adjust the set value within the specified is also be provided.

  • In Manual mode an increase decrease push button is provided to adjust the output voltage.

Emergency by-pass:

  • Provision to by pass is provided to switch on the output in case of emergency and at stabilizer maintenance time.

Indication and Metering

Indications:

  • LED type indication lamps for the following are provided separately per phase.
    1.Input high & input low
    2.Input on & output on
    3.Output trip

Metering :

  • Voltmeter with Input / output & phase selection switch is provided for measuring all individual phase voltage.

  • A meter with phase selection switch is provided for measuring load of stabilizer as per customer requirement.

Application

The IEC is an indispensible companion with all the high tech electrical & electronic equipment & machinery required steady voltage input. It will find fruitful applications in.

  • Computer Centers

  • Hospitals

  • Offices

  • Factories

  • Scientific Laboratories

  • Xerox Centers

  • EDP Centers

  • Residential Bunglows

  • Hotels

  • Process Industries

  • Cement Plants

  • Rubber Industries

  • Flour Mills

  • Paper Mills

  • Engineering Units

  • Tube Mills

  • Pharmaceutical Units

  • Tea Estates

  • Cold Storages

  • Food Processing Units

  • Oil and Vanaspati Plants

  • Rolling Mills

  • Footwear & Leather Units

  • Textile Mills

  • Distilleries & Beverages

Design Features

  • A complete solid state design using Relay drives.

  • Fast rate of correction greater then 36 Volts/Sec.

  • Short-circuit protection.

  • Overload protection.

  • Output error is less than 95%.

  • Efficiency is greater than 95%. 

  • Waveform distortion is zero.

  • Visual warning with LED's against very high & very low input Voltages.

  • Performance unaffected by load powerfactor.

Optional Features

  • Audio alarm at high / low inputs

  • Automatic high/low cut out facility with manual reset.

  • Transient suppression network.

  • Line noise suppression network.

Specification

  Single Phase

   Three Phase
Input A.C. : 170 V to 270 VAC : 300 V to 460 VAC
OutPut : 230 VAC ± 1% : 415 VAC ± 1%
Frequency : 47 - 51 Hz. : 47 - 51 Hz.
Phase : Single : Three
Volt Correction : 32 Volt/sec. : Max. 32 Volt/sec.
Line Regulation : ± 1% : ± 1%
Load Regulation : ± 1% : ± 1%
Over Load Capacity : 120% for 1 minute. : 120% for 1 minute.
Capacity : 0.5 KVA to 1500 KVA in   both the models  

Other input voltage ranges :

  • 160-260 V / 160-300 V / 150-300 V.

  • 300-460 V / 330-460 V / 360-460 V / 360-500 V

  • Servo Voltage Stabilizer is also available with output Voltage of 110v.

Specification Selection of Servo Stabilizer

(A) Voltage Fluctuation :

Note down hourly reading of your Input Voltage by good condition voltmeter for three days. Check the lowest voltage & highest voltage during the 24 hours. Peek the lowest voltage & highest voltage & give some more gap of 5% for more fluctuation & select if i.e. your require lower & highest Input Range.

(B) Load Fluctuation :

Note down the hourly reading of your individual phase to neutral with good Condition ampere meter. If your load is balance in all three phase or within 10% of your load, balance type Servo Stabilizer is applicable. If your load is unbalance more than 10%, we suggest you unbalance type Servo Stabilizer. Unbalance type Servo Stabilizer give you correction of voltage in individual phase & helps you to save your equipments & power.

(C) Selection of Rating (KVA) :

Check your all power connection (KVA) on which you want to fixx the Servo Stabilizer & select it as per your connected load. You can install higher capacity servo stabilizer which is suitable for combine load of your plant. This will be economical and easy to maintain.

Payback

Payback period of servo stabilizer is about 8-12 months after installation. This payback period is depend on input voltage variation and working hours of plant/office. Higher the input voltage, the payback period will be shorter.

Power Saving in 100 KW Supply
Total Connected Load (PI) is 100 KW
Assume that
Supply Volt (V1) : 440 Volt.
Require Volt (V2) : 400 Volt.
P2/P1 = V22/V12
P2 = P1(V2/V1)2
P2 = 100(400/440)2
= 82.63
Saving in KW = 17 KW
Working hours average 12 hours a day for 360 day.
Total Unit Saved 73440 KWH.
Average cost per unit 3.50/KWH.
Total Amount Saved = 73440 x 3.50
= Rs. 2,57,000 / Annum
Cost of 100 KVA unit is nearly 1,40,000/-
So, payback period is one year.
Life of this equipment is 15 years.
Note:- Calculation is on base of unity P.F.

Power Saving and Reduction in Breakdown

If Output Voltage Set At 415 V For 380-480 V Input Range

Input Voltage

 Approx. % Of Reduction In Electrical Breakdown of Electrical Equipment Approx. % Of Power Saving
Below 380 V 15 % Reduction In Breakdown

No Power Saving But Stabilizer Can Install For Protection Of Sensitive Electronics & Electrical Equipment
390 V 95 % Reduction In Breakdown No Power Saving No Stabilizer Required
420 V 95 % Reduction In Breakdown No Power Saving
440 V 95 % Reduction In Breakdown Approx. 7 %
460 V 95 % Reduction In Breakdown Approx. 9 %
480 V 95 % Reduction In Breakdown Approx. 12 %
Above 480 V 15 % Reduction In Breakdown Above 12 %

 

: PRODUCTS RANGE :
 Vari-O-Stat  |  Servo Stabilizers  |  D.C. Motor Drives  |  Isolation Transformer  |  L.T. Transformer  |  H.T. Transformer

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