15-01-2013, 11:01 AM
Introduction to AC/DC motor generator control panel
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Introduction
The AC/DC motor generator control panel is an all-in-one electrical device which enables the user to do many tasks on the same panel. The panel consists of the components briefly discussed below.
Components Transformer:
A transformer is an electrical device which transfers electrical energy from one circuit to another. It works on the principle of electromagnetic induction. Types: (i) Step up: ¬ when Np<Ns (ii) Step down: when Np>Ns
Three-Phase power supply:
Most electricity is generated and transmitted as three-phase AC. Rather than having a single coil rotating in a magnetic field, three-phase supply generators have three coils fixed at 120° to each other; thus three voltages, that are 120° out of phase with each other, are produced in three separate circuits.
Connection types
(i) delta (ii) star
(delta): This configuration has no neutral wire and provides a 3-phase 3-wire supply.
Star:
This configuration has 3-phases and one neutral wire. 4-wire supplies are normally used to distribute domestic supplies.
Advantages:
(a) Less copper (or aluminium) is needed for the conductors of a three-phase system which transmits a given power at a given voltage over a given distance than for a simple single-phase system.
(b) The average power is not zero due three waveforms at 120o which is not the case in single-phase.
ON/OFF buttons:
These buttons are used to produce a spike (pulse) of voltage.
Voltage Regulator:
Used to maintain a fixed voltage value by rotating the knob to the desired position.