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CONSTRUCTION OF AUTOMATIC PHASE CHANGER
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- Contributor: mr-chris
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- Case No: 566961pw
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT WILL BE HERE SOON....
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TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTCover pageDedicationCertificationAcknowledgementTable of contentCHAPTER ONE1.1 Introduction1.2 Block diagram of an automatic phase changer 1.3 Component listCHAPTER TWO-Component description2.1 comparator2.2 Zener diode p.n junction,electron,avalanche diode,avalanche breakdown}2.3 Rectifier2.4 Relay2.5 Transformer2.6 Capacitor2.7 FuseCHAPTER THREE3.1 Comparator/voltage sensor stag.3.2 Design calculator3.3 Oscillator circuit3.4 Flip flop/switching Transistor stage3.5 Logic circuit3.6 ... Continue Reading
CHAPTER ONE - [ Total Page(s): 2 ]COMPONENT LISTComponent name Quality Step down transformer 3(Files 22ov - 12v 300mA)Fuse (F1 - F3 = 5A) 3IC (IC1 – Ic3 =741) 3Transistor (T1, T2, T3 = BC 557) 3Relay (RL1 – RL3 = 12v LC/o Relay) 3Zener diode CZD1 = ZD3 = 5, 1v 3Variable resistance (VR4 – VR3 = 10K) 3Resistance (R1, R2, R4, R5, R7,R8 = 3,3k 9R3, R6, R9 = 10K)Dio ... Continue Reading
CHAPTER TWO - [ Total Page(s): 10 ]Fig 2; wiring up of a dual primary coil ,ains transformer in {a} series and {b} parallel.A main transeormer is specified by:{1} its secondary {output} voltages vs.{2} its maximum power pmax which the transformer can pass quoted in VA {volt - amp}. This determines the maximum output {secondary} current, Imax. Where VS is the secondary voltage. If there are two give the maximum for each coil.{3} its construction – it may be PCB – mounting, chassis mounting {with solder tag construction} or to roidalcal high quality design}Imax / VS= Pmax STEP DOWN TRANSFORMER.If t ... Continue Reading
CHAPTER THREE - [ Total Page(s): 4 ]DESIGN CALCULATION From fig 2: R1 and R2 from a potential divider to reduce the unregulated voltage to a low voltage of less than 5v at 160v ac input let vr2=1.5vWhere VR2 is the drop across R2 and v+ is the unregulated voltage from table 1 it can be seen that v+ 11v at 160av inputLet R1 =100k-2R2=15.7k2 =15k-2 preferred valueR3 and R4 from another potential divider for the reference letting a maximum adjustable reference of 3.5v and setting R3=1.5K-2=5kv present (preferred value) R3=1.5kv and R4 = 5kv presetFor the comparatorVour=Ao vin _ _ _ _ _ _ _ _ _ _ _ _ (3)Where Ao open ... Continue Reading
CHAPTER FOUR - [ Total Page(s): 2 ]Table 1 shows the variation in D.C voltage against the input public supply voltage. The normall open and close of the relay were identified with the and of a digital metre to avoid wrong connection of the relay contact. Fig .5 is the detail circuit diagram of the system.The output of the power supply unit which powers the relays was tested by making the relays to change – over immediately the power supplied. With a generator, the system was tested with public supply source. A single electric bulb was used for the testing. When the supply of public supply source is ON and t ... Continue Reading
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVEThe various test carried out and the results obtained demonstrate that the automatic phase change. Change –over switch achieved it’s design and construction aim. The system worked accordingly to specification and quite satisfactory. The automatic phase change –over switch is relatively affordable and reliable. It is easy to operate, and it provides a high level of power supply when there are power outages. Finally, it reduces stress associated with `manual changes –over. ... Continue Reading
REFRENCES - [ Total Page(s): 1 ]REFERENCES 1. Faissler, W.L 1991. An introduction to modern electronics, Willey, New York , NY, USA. 2. Horowitz, P. and winfierld , H. 2002. The Art of electonics, 2nd ed. Cambridge University Press, camridge, UK. 3. Owen, B. 1995. Begineer’s guide to electronics 4thed. A newness Technical Book , McGraw- Hill comapies Inc. New York, N.Y, USA. 4. Rocks , G and Mazur, G 1993. electrical motor controls, Ameriacan technical Publ., New- York, N.Y U.S.A5. Theraja, B.l. and theraja, A.K. 2002. Electrical Technology, 21st ed. Ranjendia Ravida, New Delh ... Continue Reading
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT WILL BE HERE SOON....
... Continue Reading
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