Low Voltage Protection (LVP) and Low Voltage Release (LVR)
Within the two basic categories of motor controllers, there are three major types of AC acrossthe-line controllers in use today. There are low-voltage protection (LVP), low-voltage release (LVR), and low-voltage…
Motor Controllers
Motor controllers range from a simple toggle switch to a complex system using solenoids, relays, and timers. The basic functions of a motor controller are to control and protect the…
Circuit Breaker Control Circuit
As we have discussed, circuit breakers may be remotely operated. In order to operate the breakers from a remote location, there must be an electrical control circuit incorporated. The below…
High Voltage Circuit Breaker Principle
High-voltage circuit breakers (including breakers rated at intermediate voltage) are used for service on circuits with voltage ratings higher than 600 volts. Standard voltage ratings for these circuit breakers are…
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…
