Three Phase Transformers
Three phase power distribution and transmission systems require the use of three phase transformers.
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Basic Electronics Notes
Voltage Current Characteristics of Diode
Figure 1 shows the V-I characteristics of a diode.
Instrument Transformer
High voltage and current cannot be measured by ordinary volt-meter and ampere meter. Instrument transformer are used for this purpose.
Parallel Operation of Transformer
Need for Parallel operation
- When load on the system is increased, it is easy to ad
Transformers Tests
A number of tests are made on transformer to determine the voltage ratio, reactance of the windings, magnetizing current, core losses, copper losses, efficiency and temperature rise etc
Auto Transformer
An auto transformer has one winding only Part of this winding being common to both primary and secondary.
Diode Protection
A power diode must be protected against over-voltage, over-current and transients.
Power Losses In Switches
An ideal switch is shown in Figure 1.
Diode Circuit Analysis & Losses
To analyze diode circuits, the state of the diode (on or off) must first be found. The diode can then be replaced by the switch equivalent circuit.