Sleek Stabilizer for A/C Units By Executive Engineer (Electrical) BSNL, Electrical...

Sleek Stabilizer for A/C UnitsSleek Stabilizer for A/C Units

ByByExecutive Engineer (Electrical)Executive Engineer (Electrical)

BSNL, Electrical Division,Tirunelveli.BSNL, Electrical Division,Tirunelveli.Email: [email protected] Email: [email protected]

[email protected]@gmail.com

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NEED FOR STABILIZERNEED FOR STABILIZER

1. Very high speed in growth of 1. Very high speed in growth of industries in our country.industries in our country.

2. High transmission loss from 2. High transmission loss from generation point to distribution point generation point to distribution point as well as more demand compared to as well as more demand compared to generation of electrical energy.generation of electrical energy.

3. Progress of new projects for 3. Progress of new projects for generation of power is very slow as generation of power is very slow as compared to the growth of the compared to the growth of the requirementrequirement

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4. In Urban and Rural areas the supply 4. In Urban and Rural areas the supply voltage varies from 140 to 170 Volts .voltage varies from 140 to 170 Volts .

5. All the single phase equipments are 5. All the single phase equipments are manufactured in our country is 230 Volts manufactured in our country is 230 Volts

50 Hz operation only.50 Hz operation only.

6. For optimum utilization, effective 6. For optimum utilization, effective operation and to improve the life of operation and to improve the life of equipments, we need stabilized voltage equipments, we need stabilized voltage for all kind of electrical equipments.for all kind of electrical equipments.

7. In BSNL, due to implementation of 7. In BSNL, due to implementation of latest technology, air-conditioning is latest technology, air-conditioning is essential for various telecom essential for various telecom equipments which needs stabilized equipments which needs stabilized voltage for operation.voltage for operation.

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GUIDELINESGUIDELINES

Directorate’s guidelines for wide range servo stabilizers – for Single phase

I/P Voltage range : 120V – 280V

O/P Voltage range : 240V + 1%

Rating : 1 – 350 kVA

Cooling : Upto 8 kVA – Air cooled

Oil cooled for other ratings

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SCENARIO IN TAMILNADUSCENARIO IN TAMILNADU

Power supply received from TNEB

Voltage : >170 volts in most rural & urban areas

: >140 volts in few remote villages on rare occasions

Voltage ranges of Stabilizers in TN market

Normal range : 170 – 270 volts

On request basis : 140 – 280 volts

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SELECTION OF STABILIZERSELECTION OF STABILIZER

Servo Stabilizer1. Motor cum transformer involved in voltage

correction. Hence More Power loss2. Precise voltage correction is not required for our

equipments.3. More components involved resulting in

excessive maintenance problems.4. High Wear & Tear of winding & brushes.5. Not locally serviceable6. Suitable for high precision requirement

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SELECTION OF STABILIZERSELECTION OF STABILIZER

Ordinary Sleek type stabilizer

1. Voltage correction with static winding & relays. Circular torroidal core employed. Hence less power loss & more efficiency.

2. Less components involved. Hence Simple.

3. No Wear & Tear.

4. Locally serviceable

5. Suitable for low precision requirement.

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OUR REQUIREMENTOUR REQUIREMENT

Stabilizer is required only for Split / Window and high sensible heat type ac units. Hence high precision not required

Sleek type ordinary stabilizer with input voltage range 170 – 270 volts is adequate.

In rare places, we may require 140 – 280 volts input voltage range

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Capacity of stabilizerCapacity of stabilizer Split ac unitsSplit ac units

1.5 TR Split A/C units consumes 1.5 TR Split A/C units consumes 1860 W i.e. Approx 2.20 KVA to add 1860 W i.e. Approx 2.20 KVA to add 30% it works out 2.86 KVA say 30% it works out 2.86 KVA say maximum 3 KVA stabilizer needed.maximum 3 KVA stabilizer needed.

2 TR Capacity Split A/C units 2 TR Capacity Split A/C units consumes 2385 W i.e. Approx 2.81 consumes 2385 W i.e. Approx 2.81 KVA to add 30% it works out 3.65 KVA to add 30% it works out 3.65 KVA say maximum 4 KVA stabilizer KVA say maximum 4 KVA stabilizer needed. needed.

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Capacity of stabilizer Capacity of stabilizer High Sensible heat type A/C UnitHigh Sensible heat type A/C Unit

2 x 1.5 TR power consumption is 2 x 1.5 TR power consumption is 2840 W i.e. 3.34 KVA add 30% it 2840 W i.e. 3.34 KVA add 30% it works out 4.34 KVA say 4.5 KVAworks out 4.34 KVA say 4.5 KVA

2 x 2 TR power consumption is 2 x 2 TR power consumption is 3490 W i.e. 4.11 KVA add 30% it 3490 W i.e. 4.11 KVA add 30% it works out 5.34 KVA say 5.5 KVAworks out 5.34 KVA say 5.5 KVA

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Type of materials to be used Type of materials to be used for high efficiencyfor high efficiency

Copper winding wire shall be of Copper winding wire shall be of good quality ISI Marked with ‘F’ good quality ISI Marked with ‘F’ insulation & enamel coated. insulation & enamel coated.

The transformer core shall be of The transformer core shall be of laminated Torroidal Core instead laminated Torroidal Core instead of conventional type laminated of conventional type laminated Core [ EI type, etc ]Core [ EI type, etc ]

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Specification for 3 KVA StabilizerSpecification for 3 KVA Stabilizer

CapacityCapacity Wide RangeWide Range Normal RangeNormal Range

Input RangeInput Range 140V - 280V140V - 280V 170V - 270V170V - 270V

Output RangeOutput Range 210 – 240 V210 – 240 V 210 – 240 V210 – 240 V

LV cut offLV cut off 140V140V 170V170V

HV cut offHV cut off 280V280V 270V270V

Time DelayTime Delay 2-3 Minutes2-3 Minutes 2-3 Minutes2-3 Minutes

MCB Protection (Input)MCB Protection (Input) 20 A SP&N 20 A SP&N MCBMCB

20 A SP&N 20 A SP&N MCBMCB

Electronic O/L RelayElectronic O/L Relay 6 A – 12 A6 A – 12 A 6 A – 12 A6 A – 12 A

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Specification for 4 KVA StabilizerSpecification for 4 KVA Stabilizer










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Specification for 4.5 KVA StabilizerSpecification for 4.5 KVA Stabilizer(2 x 1.5 TR High Sensible) (2 x 1.5 TR High Sensible)










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Specification for 5.5 KVA StabilizerSpecification for 5.5 KVA Stabilizer (2 x 2 TR High Sensible) (2 x 2 TR High Sensible)










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Comparison with conventional and Comparison with conventional and

Energy efficient Sleek stabilizerEnergy efficient Sleek stabilizer

Conventional Conventional stabilizerstabilizer

Energy Efficient type Energy Efficient type Sleek StabilizerSleek Stabilizer

Transformer will be EI Transformer will be EI core – Iron loss will be core – Iron loss will be high (Efficiency 89%)high (Efficiency 89%)

Torroidal core transformer Torroidal core transformer will be used with minimum will be used with minimum Iron loss ( Efficiency 95%) Iron loss ( Efficiency 95%)

Poor insulating material Poor insulating material and poor quality copper and poor quality copper may be used – Copper may be used – Copper loss will be more loss will be more

High quality copper with High quality copper with good quality insulation will good quality insulation will be used – Copper loss will be used – Copper loss will be minimum be minimum

Bigger in SizeBigger in Size Slim and sleek Slim and sleek

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Conventional Vs Sleek Conventional Vs Sleek stabilizer ( 3 kVA)stabilizer ( 3 kVA)

TypeType Losses Losses for 3 kVAfor 3 kVA

Operation Operation hrs/dayhrs/day

Kwh / Kwh / annumannum

Savings Savings in Rs.in Rs.

Conven-Conven-

TionalTional

264 264 wattswatts

12 hours12 hours 1156 1156 kWHkWH

5,780/-5,780/-

Sleek Sleek modelmodel

96 watts96 watts 12 hours12 hours 420 420 kWHkWH

2,100/-2,100/-

SavingsSavings 736 736 kWHkWH

3,680/-3,680/-

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Conventional Vs Sleek Conventional Vs Sleek stabilizer ( 3 kVA)stabilizer ( 3 kVA)

Assumptions:Assumptions:

1.1. Efficiency of conventional stabilizer : Efficiency of conventional stabilizer : 89%89%

2.2. Efficiency of sleek stabilizer : 96%Efficiency of sleek stabilizer : 96%

3.3. Energy cost : Rs. 5.00 per kWHEnergy cost : Rs. 5.00 per kWH

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RecommendationsRecommendationsSl noSl no Ac unitAc unit Stab. Stab.

Type Type RatingRating I/P I/P

VoltageVoltage

11 1.5 TR1.5 TR SleekSleek 3 kVA3 kVA 170-270170-270

140-280140-280

22 2 TR2 TR SleekSleek 4 kVA4 kVA 170-270170-270

140-280140-280

33 2x1.5 TR 2x1.5 TR High SensHigh Sens

SleekSleek 4.5 kVA4.5 kVA 170-270170-270

140-280140-280

44 2x2 TR High 2x2 TR High SensibleSensible

SleekSleek 5.5 kVA5.5 kVA 170-270170-270

140-280140-280

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Proposed Components TypeProposed Components Type

ComponentComponent TypeTypeTorroidal Core for transformerTorroidal Core for transformer Silicon Steel CRGO - M4 GradeSilicon Steel CRGO - M4 Grade

Winding copper wireWinding copper wire Enameled class “F” insulationEnameled class “F” insulation

InsulationInsulation Ployster Class ‘B’ Ployster Class ‘B’

Metal ChassisMetal Chassis 1.0 mm thick1.0 mm thick

Outer finishOuter finish Powder coat, white or grey Powder coat, white or grey

Screws Nickel platedScrews Nickel plated Combi Philip Head Combi Philip Head

Printed Circuit BoardPrinted Circuit Board PCS or IC or reputed makePCS or IC or reputed make

LEDLED 5 mm x 2 mm Square5 mm x 2 mm Square

Electro magnetic relayElectro magnetic relay 30 A - 12V/24V Single 30 A - 12V/24V Single ChangeoverChangeover

Electronic over load Electronic over load relayrelay

Range setting varies Range setting varies from 06 A to 20 A as per from 06 A to 20 A as per ratingrating

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Wish you Happy Deepavali

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Thank YouThank Youvery muchvery much

Date post:	17-Dec-2015
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