Explain Different Types of Relay Pdf

Based on the operating quantity the pick-up quantity is calculated. Relays are classified in large based on the principle of operation.

Different Types Of Relays Their Construction Operation Applications

Types of protection relays are mainly based on their characteristic logic on actuating parameter and operation mechanism.

. These are similar to the electromechanical relays but there exists both permanent magnet and electromagnet in it the movement of the armature depends on the polarity of the input signal applied to the coil. What is Electrical WiringDifferent Types of Electrical Wiring Systems. Loop-in or Looping SystemCasing and Capping wiringBatten Wiring CTS or TRSLead Sheathed WiringConduit WiringSurface Conduit WiringConcealed Conduit wiringTypes of ConduitMetallic.

Relays are always shown in the de-energized position no current flowing through the control circuit - OFF. A simple electromagnetic relay is made up of a solenoid which is wire coiled around a soft iron core an iron yoke that provides a low reluctance path for magnetic flux a movable iron frame and one or more sets of contacts. Relays are mainly made for two basic operations.

Normally open relays have a switch that remains open until energized ON while normally closed relays are closed until energized. Types of Relay Based on the polarity. It detects the intolerable or undesirable condition with an assigned area and gives the commands to the circuit breaker to disconnect the affected area.

Based on operation mechanism protection relay can be categorized as electromagnetic relay static relay and mechanical relay. The two most popular types of these relays include differential and bridge type relays. Normally open relays are the most common in vehicles.

In differential magnetic system the difference of two fluxes of permanent magnet acts on the armature. For high voltage applications they are mainly designed to reduce a phenomenon called arcing. This is the most common relay type and is used widely in automation.

Although there are different types of over current relays but basic working principle of over current relay is more or less same for all. There are basically two types of relays in this category. Power system protection relays can be categorized into different types of relays.

Types of Overcurrent Relay. For years we have been using static relays and magnetic relays for protecting an electrical network now when the microprocessors got evolved the protection devices also got evolved. Types of Over Current Relay Depending upon time of operation there are various types of Over Current relays such as 1.

These relays are known as distance relay or impedance 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. This overload protection relay reacts to.

Transductor Magnetic Amplifier Relays 3. The electrical protective relay can be broad classified into two categories i Electromagnetic Relay and ii Static Relay. For which the operating quantity is current the difference in current and frequency.

Depending on the operating principle and structural features relays are of different types such as electromagnetic relays thermal relays power varied relays multi-dimensional relays and so on with varied ratings sizes and applications. Instantaneously overcurrent relay operates when the current exceeds its Pickup value. One is low voltage application and the other is high voltage.

The two types of attracted armature type relays are shown in the Figurea and bIn attracted armature type there exists a laminated electromagnet which carries a coilThe coil is energised by the operating quantity which is proportional to the circuit voltage or currentThe armature or a moving iron is subjected to the magnetic force produced by the operating quantityThe force. Rectifier Bridge Relays 4. In this article we will see the further classification of relays based on principle and structure.

It is the combination of both electromechanical and solid-state relays. However either can be use in. Static relays are classified according to the type of the measuring unit or comparator as follows.

Different Types of Relays. In bridge type magnetic system the field created by the coils divided into two fluxes which have opposite signs in the working gap area but the magnetic flux of the permanent. Different types of Numerical Relays As the technology developed the protection devices have also undergone many changes from a normal fuse to the circuit breaker.

The relay is the device that open or closes the contacts to cause the operation of the other electric control. Working Principle of Distance or Impedance Relay. Definite time over current relay.

The term static implies that the relay has no moving mechanical parts in it. 1Mixed IDMT and high set instantaneous. The first type is the normal onoff relay.

Instantaneous Overc1r11e1nt Relay. The two relays shown below. These were the first to be developed in the series of static relays.

Electromagnetic attraction type relay. More specifically the relay operates depending upon the impedance between the point of fault and the point where relay is installed. Cleat Wiring Methods of Electrical Wiring Systems wrt Taking Connection.

Electromechanical and Solid-state relays. Joint Box or Tee or Jointing System. In the distance relay the operating quantity is impedance.

Thus protects the system from damage. Generally there are two types of relays used for DC and AC switching. Attraction armature type relay.

There is one type of relay which functions depending upon the distance of fault in the line. We have overcurrent relays differential relay frequency relay etc. The three main types of relays are electromechanical solid-state and reed.

This relay changes state as long as the electromagnet is actuated and goes back into relax state when the electromagnet is not actuated any more. Inverse Time Overcurrent Relay IDMT Relay Directional overcurrent relay. Hall Effect Relays 6.

For low voltage applications more preference will be given to reduce the noise of the whole circuit. Instantaneous over current relay. The operation of this relay is based on the current magnitude and it is without any time delay.

The static relay are next generation relays The Solid Static relays was first introduced in 1960s. Compared to the Electromechanical Relay the Solid Static relay has longer life-span decreased noise when operates and faster respond speed.

Relay Different Types Of Relays And Their Working Envirementalb Com

Types Of Relay Different Types Of Relay Classification Of Relays Youtube

Classification Of Relays Different Types Of Relays