Auto Selection of any Available Phase, in 3 Phase Supply System
Auto Selection of any Available Phase, in 3 Phase Supply System Introduction The basic idea for the development of the project is to provide supply to the single phase load if any of the phases, out of the 3 phases misses. The three transformers are connected to the 3 phases supply. It automatically switch to next phase while one phase is misses. For monitoring the phase shifting we are using NAND gate logics. The relay driver IC to change the load to the next phase through the contacts those are fed from all the three phases. At final condition it works on inverter. http://www.edgefxkits.com/
Auto Selection of any Available Phase, in 3 Phase Supply System Working Three phase supply are given to three independent transformers connected in together with another transformers from receiving supply, an inverter. The secondary of the transformers are used to develop DC by half wave rectification and then deriving four number of opto isolators individually. The DC supply from all the three phases and inverter supply are combined and then fed to the regulator IC 7805 for the circuit operation power. The relays connected drive the load with interlocking logic from the NO/NC contact such that the 1st phase load automatically changes over to any available phase in the event http://www.edgefxkits.com/
Auto Selection of any Available Phase, in 3 Phase Supply System Description of power supply The basic idea for the development of the project is to provide supply to the single phase load if any of the phases, out of the 3 phases misses. The three transformers are connected to the 3 phases supply. It automatically switch to next phase while one phase is misses. For monitoring the phase shifting we are using NAND gate logics. The relay driver IC to change the load to the next phase through the contacts those are fed from all the three phases. At final condition it works on inverter. http://www.edgefxkits.com/
Auto Selection of any Available Phase, in 3 Phase Supply System
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Auto Selection of any Available Phase, in 3 Phase Supply System Hardware Requirements
Transformers Logic Gates Resistors Capacitors Relay Driver Relays Lamp Diodes
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Auto Selection of any Available Phase, in 3 Phase Supply System And Gate description The 4000 Series CMOS range, and contains four independent CMOS AND gates each with two inputs. Pin Description
Pin 7 is the negative supply Pin 14 is the positive supply Pins 1&2, 5&6, 8&9, 12&13 are gate inputs Pins 3, 4, 10, 11 are gate outputs
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Auto Selection of any Available Phase, in 3 Phase Supply System Relay A relay is an electrically operated switch. Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions and have double throw (changeover) switch contacts as shown in the diagram.
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Auto Selection of any Available Phase, in 3 Phase Supply System Resistor
Capacitors
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Auto Selection of any Available Phase, in 3 Phase Supply System Relay driver The ULN2003 is a monolithic high voltage and high current Darlington transistor arrays. It consists of seven NPN Darlington pairs that features high-voltage outputs with common-cathode clamp diode for switching inductive loads. The ULN functions as an inverter. If the logic at input 1B is high then the output at its corresponding pin 1C will be low. http://www.edgefxkits.com/
Auto Selection of any Available Phase, in 3 Phase Supply System Applications ďƒ˜ In this work, an automatic three phase changer comparator has been designed, built and tested. ďƒ˜ The system operates smoothly as expected. It is reliable, durable and portable. The cost involved in developing it, makes it much more affordable than comparable product.
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Auto Selection of any Available Phase, in 3 Phase Supply System Conclusion ďƒ˜ Further the project can be enhanced by incorporating power semiconductor devices such as thyristors/IGBTs for instantaneous changeover to the next available phase. ďƒ˜ This overcomes the drawback of the changeover time generally witnessed by relay switching operations.
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