The choice of earthing system in both low voltage and medium voltage networksdepends on the type of installation as well as the type of network. It is also influenced by the type of loads and service continuity required. The Main objectives of an earthing system are Provide an alternative path...
Relays are generally employed where it is required to regulate a circuit through an individual minimal power signal or used where multiple circuits need to be regulated through a single signal. The initial utilization of relays was in the extended length of telegraph circuits like signal repeaters a...
The analysis of these faults is required for selecting the rupturing capacity of the circuit breakers, choosing set-phase relays and other protective switchgear. These faults are analyzed on per phase basis using bus impedance matrix or Thevenins’s theorem. Unsymmetrical Faults The most common fault...
Commonly used intermediate relays have two series, JZ7 and JZ8. Diagram of the auxiliary relay The role of the intermediate relay: play a role in converting and transmitting control signals. Its input signal is the power-on and power-off signal of the coil, while the output signal is the ...
Electrical relays are one of the most frequently used devices in modern technological systems. It can be found in cars, washing machines, microwave ovens, medical equipment, as well as tanks, airplanes and ships.
The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current.Relaysare used in a wide variety of app...
Relays are electronic devices that accept current or voltage signals in an input circuit as a prompt to switch open or close another circuit or pilot
There is a control scheme used in general purpose power relays that is known as pulse width modulation (PWM). The PWM scheme uses solid state control to operate and typically used to regulate the power requirements of the relay coil hold current. This, in turn, helps reduce heat dissipated ...
by turning ON & OFF a load at regular intervals and also they create a flashing effect. These are either multi-function or single-function devices. These kinds of time delay relays are frequently used in applications wherever it is necessary to cycle power to an electrical system or a device...
Solid State Relays (SSRs) SSRs can be used to control both AC and DC. They have sensors that respond to the control signal and switch power accordingly. It mostly offers a clean and bounceless operation. SSRs are widely used in a variety of applications that require precise control over ...