In this session you will learn about about the types of Electromagnetic attraction relay such as Attracted Armature Type Relay and Solenoid Plunger Type Relay. The Watt-hour structure type relay works as an electromagnetic induction type of watthour - a meter so named, after it. It consists of two magnets: upper and lower. electromagnets and aluminium disc, which is pivoted such that it rotates freely between the two electromagnets. In this relay, the upper magnet consists of two windings: primary Electromechanical Relay. An electromechanical relay is a type of relay which function using a magnetic field produced by an electromagnetic coil when a control signal is applied to it. It is called as electromechanical since it has moving contacts in the output circuit which are operated by applying an electrical signal. The electrical protective relay can be broad, classified into two categories (i) Electromagnetic Relay and (ii) Static Relay. According to the principle of operation and construction, the relay may be classified such as the electromagnetic attraction type, electromagnetic induction type, electrodynamic type, moving coil type, electro-thermal type, physics electric type, and static relays. Abstract—Relays are used industrially in a wide variety of applications. Traditional mechanical relays are large, slow, noisy devices, but are still widely used in various machines and processes for control purposes. In this paper cross section of a moving electromagnetic relay is A; can. be inside the external vertical hole magnetic chamber. Note: Relays without contacts are not included in this technical guide. Hybrid relays are a combination of the best of both relays with contacts and relays without contacts. Semiconductor elements transmit and cut the signal or power and contacts are used to supply the power for the relay. · Hinged Relays With hinged relays, the armature of Electromagnetic induction type relay; Electromagnetic Attraction type relay; Electromagnetic attraction relays can be actuated by both AC & DC quantities. It can be operated by the movement of a piece of iron (electromagnet) when it is attracted by the magnetic field produced by a coil or a plunger being drawn into a solenoid. Based on this contact unit using electromagnetic attraction, which is produced when electric current exceeding the specified value flows to the electromagnet; the voltage and current (input signal) applied to the coil Circulating Current Type It can also be used as impedance relay. Two rectifier bridges can be arranged in such a manner as shown in An electromagnetic attraction relay is an electromechanical relay that operates on the principle of electromagnetic attraction. Whenever there is a fault in the system the current measured by the current transformer(C.T) is large, that large current will energize the relay operating coil. Resultant torque of electromagnetic relay is given by. T R = K 1 I 2 - K. As the operating torque produced is proportional to the square of the current. Hence, the electromagnetic attraction relay can be used for a.c as well as d.c. Note: Electromagnetic induction relay is applicable for AC relaying purposes only. admin. -. October 27, 2021. Definition:- Electromechanical relays that use either electromagnetic attraction or electromagnetic induction principles for their operation. Such relays are called electromagnetic relays. In o