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Timer Relay: Attached to the main contractor serves as a switch from the Star relationship to the Delta relationship. The principle works like a normal clock but uses electric current as a source of energy. This tool is equipped with an electric…
The synchronous motor is an AC motor that works at a fixed speed in a particular frequency system. This motor requires direct current (DC) for power generation and has a low initial torque. Therefore synchronous motors are suitable for initial use with…
What is Automatic Voltage Regulator (AVR)? An automatic voltage regulator is used to regulate the fluctuating voltage. Voltage stability is very important to note because it can affect the electrical system. In a large-scale interconnection system, a manual voltage stabilizer is never used and…
The switched reluctance motor is designed for high-performance servo applications. The switched reluctance motor is particularly suitable for a wide range of applications due to the robustness of the mechanical and electrical design. In a reluctance machine, the torque is produced by the moving…
A Gas turbine is also called a combustion turbine is a type of continuous combustion, internal combustion engine which produces electric current. The gas turbine can operate using two types of fuel (dual fuel system) namely natural gas and oil, can also be operated…
The methods used for measurement of medium resistances are not suitable for measurement of low resistance. This is due to the fact that resistances of leads and contacts, though small, are appreciable in comparison to the low resistances under measurement. Voltmeter–Ammeter Method…
Current measurement is needed for devices such as the thermocouple-gauge pressure sensor and the ionization gauge that have an output in the form of a varying electrical current. Analogue meters are useful in applications where there is a need to display the…
A stepper motor is a small powered motor designed for tracking and positioning. The electromechanical actuator converts digital inputs into analog motion through the controller electronics. The normal stepper has accuracy 3-5% of step value without error accumulation. Most step motors are…
Optoisolators are a component that is used as a component of I / O control for equipment that operates with DC or AC voltage. An optocoupler consists of GaAs LEDs and NPN phototransistor made of silicon. In Figure a. optoisolator gets a…
Inverse Time Circuit Breakers Inverse time circuit breakers have both thermal and instantaneous trip features and are preset to trip at standardized levels. This is the most common type of circuit breaker used in the building trades for residential, commercial, and heavy…
