Skip to main content

Featured Post

Induction Motor Interview Questions with Answers | Part-1

4 comments

Advantages and Disadvantages of Electromagnetic Relay

Advantages and Disadvantages of Electromagnetic Relay


There are many Advantages, Disadvantages and Application of Electromagnetic Relay which will be mentioned in this article


Advantages, Disadvantages and Application of Electromagnetic Relay
Advantages and Disadvantages of Electromagnetic Relay


Advantages Of Electromagnetic Relay



✓ Electromagnetic relays have fast operation and fast reset.


✓ They can be used for both a.c.and d.c.systems for protection of a.c.and d.c.
equipments.


✓ Electromagnetic relays operating speeds which has the ability to operate in milliseconds
are also can be possible.


✓ They have the properties such as simple, robust, compact and most reliable.


✓ These relays are almost instantaneous. Though instantaneous the operating time of the relay varies with the current. With extra arrangements like dashpot, copper rings etc.


✓ slow operating times and reset can be possible.


Disadvantages Of Electromagnetic Relay



✓ High burden level instrument transformers are required such that CTs and PTs of high burden is required for operating the electromagnetic relays compared to static relays.


✓ The directional feature is absent in electromagnetic relays.


✓ Requires periodic maintenance and testing unlike static relays.


✓ Relay operation can be affected due to ageing of the components and dust,pollution
resulting in spurious trips.


✓ Operation speed for an electromagnetic relays is limited by the mechanical inertia
component.



Applications Of Electromagnetic Relay:



✓ Electromagnetic relays are employed for the protection of various a.c.and d.c.
equipments.


✓ The over or under current and voltage protection of various a.c.and d.c.equipments.


✓ For differential protection.


✓ Used as auxiliary relays in the contact systems of protective relays schemes.


Related Articles Mentioned below

Labels:

Comments

Post a Comment

Popular posts from this blog

Variable Inductance Transducer | Classification Of Variable Inductance Transducer

Variable Inductance Transducer | Classification Of Variable Inductance Transducer Variable Inductance Transducer | Classification Of Variable Inductance Transducer These are based on a change in the magnetic characteristic of an electrical circuit in response to a measurand which may be displacement, velocity, acceleration etc. Variable inductive transducer may be classified as follows: 1.Self-generating type In this type voltage is generated because of the relative motion between a conductor and a magnetic field. These may be further classified as follows: (A)Electromagnetic type (B)Electrodynamic type (C)Eddy current type 2.Passive type In this type the motion of an object results in change in the inductance of the coils of the transducer. These may be further classified as follows: (A)Variable reluctance (B)Mutual inductance (C)Differential transfer type 1.Self-generating Type (A)Eleotromagnetic t...
1 comment
Read more

MarX Generator

MarX Generator | High voltage pulse generator Marx Generator - High voltage pulse generator What is MarX Generator? Marx Generator is Electrical circuit which used for generate high voltage pulse. Marx generator is same as like voltage multiplier circuit. First watch the video of marx generator.. Marx Generator produce high voltage Spark as like lightning. Now learn how to make marx generator... Circuit Diagram of marx generator circuit is shown in below image. Circuit Diagram of marx Generator Here, First capacitor are connected in parallel. When DC supply is applied, capacitors charge through resistor by voltage Vc. Spark gaps use as a switch, Here first spark gap voltage is greater than the voltage Vc. So spark gaps are behave as a open circuit during capacitor charge. Now to generate high voltage pulse, The first spark gap need to be breakdown. So, By breakdown spark gap will be short circuit an...
4 comments
Read more

Induction Motor Interview Questions with Answers | Part-1

Induction Motor Interview Questions with Answers | Part-1 Induction Motor Interview Questions with Answers | Part-1 Q.1 The frame of an induction motor is made of (A) aluminium (B) silicon steel (C) closed grained cast iron (D) stainless steel (E) bronze Answer:  (C) closed grained cast iron Q.2 The stator frame is an induction motor is used to (A) hold the armature stampings in position (B) ventilate the armature (C) protect the whole machine (D) provide return path for flux Answer:  (A) hold the armature stampings in position Q.3 The stator core of a 3 phase induction motor is laminate in order to reduce the (A) eddy current loss (B) hysteresis loss (C) both hysteresis and eddy current loss (D) weight of the stator (E) windage and friction losses Answer: (A) eddy current loss Q.4 An induction motor works with (A) dc only (B) ac only (C) ac and dc both (D) none of these Answer:  (B) ac only Q.5 Which of the following statement associated with polyphase induction motor is...
4 comments
Read more