Low Voltage Air Circuit Breaker Principle
A low-voltage circuit breaker is one which is suited for circuits rated at 600 volts or lower. One of the most commonly used low-voltage air circuit breakers is the molded…
D Flip Flop PLC Ladder Logic
This is the PLC Program to implement D flip flops in PLC. Learn PLC programming based on simple digital electronics examples.
What is a circuit breaker ?
A circuit breaker is a device that is used to completely disconnect a circuit when any abnormal condition exists. The circuit breaker can be designed to actuate under any undesirable…
Electrical System Components and Protection Devices
Plant facilities rely on dependable electrical distribution systems to provide power to key vital equipment. Knowledge of the basic electrical power distribution system and its components will help the operator…
Multimeter & Megger Principle
The multimeter can be used as an ammeter, an ohm meter, or a voltmeter. Meggers are used to measure insulation resistance. Multimeter The multimeter is a portable single instrument capable…
What is Synchroscope ?
A synchroscope indicates when two AC generators are in the correct phase relation for connecting in parallel and shows whether the incoming generator is running faster or slower than the…
Ground Detector Principle
The ground detector is an instrument which is used to detect conductor insulation resistance to ground. An ohm meter, or a series of lights, can be used to detect the…
Power Factor Meter Principle
A power factor meter is a type of electrodynamometer movement when it is made with two movable coils set at right angles to each other. The method of connection of…
Ampere Hour Meter
The ampere-hour meter registers ampere-hours and is an integrating meter similar to the watt-hour meter used to measure electricity usage in a home. Typical ampere-hour meters are digital indicators similar…
Three Phase Wattmeter
Total power in a 3φ circuit is the sum of the powers of the separate phases. The total power could be measured by placing a wattmeter in each phase (below…
