Automatic phase changer
Upcoming SlideShare
Loading in...5
×
 

Automatic phase changer

on

  • 1,094 views

 

Statistics

Views

Total Views
1,094
Views on SlideShare
1,094
Embed Views
0

Actions

Likes
0
Downloads
29
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Automatic phase changer Automatic phase changer Presentation Transcript

  • AUTOMATIC PHASE CHANGER
  • Aim: The main aim of this system is to provide uninterruptable power supply for single phase loads even in the failure of one or two phases in a three phase system.
  • Introduction: If any one or two phases in a 3-phase supply interrupted/goes low and you want equipment to work on normal voltages then this circuit will give solution . This system is designed to monitor the presence of supply to the three phases and to display condition of each phase on an LCD.
  • Hardware Requirements: Power Supply 5V. Microcontroller AT89C51. Step Down Transformers. Comparators. Switching Devices. Other Hardware Components
  • Power supply to all sections Step down T/F Bridge Rectifier Filter Circuit Regulator Block Diagram of power supply: D 1 3 R 1 5 P U S H P A K T E C H N O L O G I E S D 1 6 C 1 1 D 1 5 V C C U 5 31 2 V O U TV I N GND C 1 2 P O W E R S U P P L Y < R e v C o d e > 3 P H A S E D R I V E S A F T Y S Y S T E M C u s t o m 2 2S a t u r d a y , M a r c h 1 3 , 2 0 1 0 T it le S iz e D o c u m e n t N u m b e r R e v D a t e : S h e e t o f P S T V IN D 1 4 C 1 3 G N D IN L E D 1
  • Relay Relay Relay Output Output Output Transformer1 (R-phase) Transformer2 (Y-phase) Transformer3 (B-phase) Rectifier & Filter circuit Rectifier & Filter circuit Rectifier & Filter circuit Comparator Comparator Comparator Relay Relay Relay Output Output Output Transformer1 (R-phase) Transformer2 (Y-phase) Transformer3 (B-phase) Rectifier & Filter circuit Rectifier & Filter circuit Rectifier & Filter circuit Comparator Comparator Comparator Transformer1 (R-phase) Transformer2 (Y-phase) Transformer3 (B-phase) Rectifier & Filter circuit Rectifier & Filter circuit Rectifier & Filter circuit Comparator Comparator Comparator Sensing Module:
  • Working: It monitors the presence of three phases and to display condition of each phase on an LCD. It monitors the voltage condition of each phase. If the voltage level of any phase is under the rated / specified voltage rating, immediately this phase is connected to a healthy phase thus, supplies to the load. The phase voltage is stepped down 230 V to 12 V, 300 mA.
  • These 12v is rectified through a rectifier circuit and filtered through a capacitor. The voltage at inverting terminal of Op-Amp is taken from voltage divider circuit of resistor R1 and preset resistor VR1, at non inverting terminal 5.1 V will be set through zener diode. When the line voltage is below 200 V, the voltage at the inverting terminal is less than the voltage at the non-inverting terminal. Thus the output of the operational amplifier now goes low.
  • As a result transistor conducts and output is fed to microcontroller and output microcontroller is fed to electromagnetic relay through a transistor. Consequently, the AC supply is shifted to absence phase and electrical appliances turn ON. Thus the appliances are protected against under- voltage.
  • Circuit Diagram: R 8 R 5 G N D I N P H A S E I N 2 R 1 8 L 3 - + U 23 2 6 7 1 4 5 D 6 R 9 Q 4 S W 3 1 2 R 1 V C C R 2 R L 3 C 7 D 1 1 R 1 7 R 1 2 - + U 33 2 6 7 1 4 5 D 7 C 2 R 1 1 R 7 S W 1 1 2 R 6 V C C V C C S W 4 1 2 P H A S E I N 1 R 1 0 Q 1 L S 1 3 5 4 1 2 C 1 Q 2 R L 1 Q 5 P H 1 P H A S E I N 3 P S T V I N R 4 P H 2 D 8 V C C R 3 T 2 15 6 48 C 6 D 9 L S 2 3 5 4 1 2 P U S H P A K T E C H N O L O G I E S C 4 Q 6 Q 3 D 3 D 2 V C C D 1 L 2 V C C V C C D 1 0 D 4 L S 3 3 5 4 1 2 C 3 - + U 13 2 6 7 1 4 5 C 5 D 1 2 L 1 D 5 V C C S E N S IN G M O D U L E < R e v C o d e > 3 P H A S E D R I V E S A F T Y S Y S T E M A 4 1 2S a t u r d a y , M a r c h 1 3 , 2 0 1 0 T it le S iz e D o c u m e n t N u m b e r R e v D a t e : S h e e t o f V C C R L 2 S W 2 1 2 N E U T R A L R 1 6 T 3 15 6 48 P H 3 T 1 15 6 48 Sensing Module
  • D 2 1 L E D 2 D 2 0 R L 3 D 1 9 S W 5 O K D 1 7 C O N T R O L M O D U L E < R e v C o d e > 3 P H A S E D R IV E S A F T Y S Y S T E M C u s t o m 2 2T u e s d a y , J u ly 1 9 , 2 0 1 1 T it le S iz e D o c u m e n t N u m b e r R e v D a t e : S h e e t o f R L 1 B Z 1 P O T R 1 3 3 1 2 V C C A P P L I A N C E P U S H P A K T E C H N O L O G I E S Y 1 U 4 A T 8 9 S 5 2 29 3 0 40 20 31 191 8 9 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 1 2 3 4 5 6 7 8 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 PSEN A L E VCC GND EA X1X 2 R S T P 0 . 0 / A D 0 P 0 . 1 / A D 1 P 0 . 2 / A D 2 P 0 . 3 / A D 3 P 0 . 4 / A D 4 P 0 . 5 / A D 5 P 0 . 6 / A D 6 P 0 . 7 / A D 7 P 1 . 0 / T 2 P 1 . 1 / T 2 E X P 1 . 2 P 1 . 3 P 1 . 4 P 1 . 5 / M O S I P 1 . 6 / M I S O P 1 . 7 / S C K P 2 . 0 / A 8 P 2 . 1 / A 9 P 2 . 2 / A 1 0 P 2 . 3 / A 1 1 P 2 . 4 / A 1 2 P 2 . 5 / A 1 3 P 2 . 6 / A 1 4 P 2 . 7 / A 1 5 P 3 . 0 / R X D P 3 . 1 / T X D P 3 . 2 / I N T 0 P 3 . 3 / I N T 1 P 3 . 4 / T 0 P 3 . 5 / T 1 P 3 . 6 / W R P 3 . 7 / R D C 8 L E D 1 P H 3 D 1 8 P H 2 R 2 2 C 1 0 L E D 3 R 2 1 V C C O K R 1 9 V C C J 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P H 1 R 2 0V C C L E D 3 B U Z Z E R R 2 3 A P P L I A N C E B U Z Z E R R 1 4 V C C R L 2 L E D 2 C 9 L E D 1 Control Module
  • Programming modules: LCD module. Phase sensing Module. Control Module.
  • Advantages: Revenue Collection Efficiency Transparency in distribution Better customer Service Zero man-made errors Continuous running of single phase loads
  • Applications: Small and Medium Scale Industries Residential Apartments. Offices. ATM.
  • REFERENCES 1. Electron Devices and Circuits by P. Ramesh Babu, T.R. Ganesh Babu,Scitech Publications(INDIA) Pvt. Ltd. Chennai. 2.http://www.circuitstoday.com/wpcontent/uploads/ 2009/09/741ic-inverting- comparator-circuit.jpg 3.IEEE Standard , Standard Inverse-Time Characteristic Equations for Overcurrent Relays. 4. http://www.en.wikipedia.org/wiki/tansformer#mw- head.