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Sleek Stabilizer for A/C Units By Executive Engineer (Electrical) BSNL, Electrical Division,Tirunelveli. Email: chalapathy@bsnl.co.in venkatchalapathy6107@gmail.com
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2 NEED FOR STABILIZER 1. Very high speed in growth of industries in our country. 2. High transmission loss from generation point to distribution point as well as more demand compared to generation of electrical energy. 3. Progress of new projects for generation of power is very slow as compared to the growth of the requirement
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3 4. In Urban and Rural areas the supply voltage varies from 140 to 170 Volts. 5. All the single phase equipments are manufactured in our country is 230 Volts 50 Hz operation only. 50 Hz operation only. 6. For optimum utilization, effective operation and to improve the life of equipments, we need stabilized voltage for all kind of electrical equipments. 7. In BSNL, due to implementation of latest technology, air-conditioning is essential for various telecom equipments which needs stabilized voltage for operation.
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4 GUIDELINES 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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5 SCENARIO 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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6 SELECTION OF STABILIZER Servo Stabilizer 1. Motor cum transformer involved in voltage correction. Hence More Power loss 2. 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 serviceable 6. Suitable for high precision requirement
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7 SELECTION 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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8 OUR 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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9 Capacity of stabilizer Split ac units 1.5 TR Split A/C units consumes 1860 W i.e. Approx 2.20 KVA to add 30% it works out 2.86 KVA say maximum 3 KVA stabilizer needed. 2 TR Capacity Split A/C units consumes 2385 W i.e. Approx 2.81 KVA to add 30% it works out 3.65 KVA say maximum 4 KVA stabilizer needed.
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10 Capacity of stabilizer High Sensible heat type A/C Unit 2 x 1.5 TR power consumption is 2840 W i.e. 3.34 KVA add 30% it works out 4.34 KVA say 4.5 KVA 2 x 2 TR power consumption is 3490 W i.e. 4.11 KVA add 30% it works out 5.34 KVA say 5.5 KVA
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11 Type of materials to be used for high efficiency Copper winding wire shall be of good quality ISI Marked with ‘F’ insulation & enamel coated. The transformer core shall be of laminated Torroidal Core instead of conventional type laminated Core [ EI type, etc ]
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12 Specification for 3 KVA Stabilizer Capacity Wide Range Normal Range Input Range 140V - 280V 170V - 270V Output Range 210 – 240 V LV cut off 140V170V HV cut off 280V270V Time Delay 2-3 Minutes MCB Protection (Input) 20 A SP&N MCB Electronic O/L Relay 6 A – 12 A
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13 Specification for 4 KVA Stabilizer Capacity Wide Range Normal Range Input Range 140V - 280V 170V - 270V Output Range 210 – 240 V LV cut off 140V170V HV cut off 280V270V Time Delay 2-3 Minutes MCB Protection (Input) 32 A SP&N MCB Electronic O/L Relay 10 A – 16 A
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14 Specification for 4.5 KVA Stabilizer (2 x 1.5 TR High Sensible) Capacity Wide Range Normal Range Input Range 140V - 280V 170V - 270V Output Range 210 – 240 V LV cut off 140V170V HV cut off 280V270V Time Delay 2-3 Minutes MCB Protection (Input) 32 A SP&N MCB Electronic O/L Relay 12 A – 18 A
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15 Specification for 5.5 KVA Stabilizer (2 x 2 TR High Sensible) Capacity Wide Range Normal Range Input Range 140V - 280V 170V - 270V Output Range 210 – 240 V LV cut off 140V170V HV cut off 280V270V Time Delay 2-3 Minutes MCB Protection (Input) 32 A SP&N MCB Electronic O/L Relay 14 A – 20 A
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16 Comparison with conventional and Energy efficient Sleek stabilizer Conventional stabilizer Energy Efficient type Sleek Stabilizer Transformer will be EI core – Iron loss will be high (Efficiency 89%) Torroidal core transformer will be used with minimum Iron loss ( Efficiency 95%) Poor insulating material and poor quality copper may be used – Copper loss will be more High quality copper with good quality insulation will be used – Copper loss will be minimum Bigger in Size Slim and sleek
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17 Conventional Vs Sleek stabilizer ( 3 kVA) Type Losses for 3 kVA Operation hrs/day Kwh / annum Savings in Rs. Conven-Tional 264 watts 12 hours 1156 kWH 5,780/- Sleek model 96 watts 12 hours 420 kWH 2,100/- Savings 736 kWH 3,680/-
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18 Conventional Vs Sleek stabilizer ( 3 kVA) Assumptions: 1.Efficiency of conventional stabilizer : 89% 2.Efficiency of sleek stabilizer : 96% 3.Energy cost : Rs. 5.00 per kWH
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19 Recommendations Sl no Ac unit Stab. Type Rating I/P Voltage 1 1.5 TR Sleek 3 kVA 170-270140-280 2 2 TR Sleek 4 kVA 170-270140-280 3 2x1.5 TR High Sens Sleek 4.5 kVA 170-270140-280 4 2x2 TR High Sensible Sleek 5.5 kVA 170-270140-280
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20 Proposed Components Type ComponentType Torroidal Core for transformer Silicon Steel CRGO - M4 Grade Winding copper wire Enameled class “F” insulation Insulation Ployster Class ‘B’ Metal Chassis 1.0 mm thick Outer finish Powder coat, white or grey Screws Nickel plated Combi Philip Head Printed Circuit Board PCS or IC or reputed make LED 5 mm x 2 mm Square Electro magnetic relay 30 A - 12V/24V Single Changeover Electronic over load relay Range setting varies from 06 A to 20 A as per rating
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21 Wish you Happy Deepavali
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22 Thank You very much
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