ANSI Codes of Frequency Protection Relay
ANSI codes of frequency relay are 81H, 81L, 81 R. The 81H, 81L, 81 R are frequency relay acronyms for over-frequency, under-frequency, and rate of
Power System
Lightning Arrester-Definition, Working & Characteristics
Lightning Arrester is a device used for the protection of electrical equipment against lightning stroke. The lightning stroke is the high voltage transients caused by
ANSI Device Numbers
The ANSI standard device numbers ( As per ANSI/IEEE standard C37.2) are used in the design of an electrical power system. These devices protect the
Why is grit Laid in the electrical switchyard?
Grit in the electrical switchyard is laid to make the upper surface of the soil more resistive. The more resistivity of the soil decreases the
Difference between Contactor and Relay
In this post, we will learn what is the difference between contactor and relay. We use contactor and relay in almost all electrical circuits. We
Classification of Relays | Different Types of Relays
In this post, we shall discuss different types of Relays like Latching Relay, Reed Relay, Solid State Relay, Differential Relay, Automotive Relay, Timer Delay Relay,
What is a Link Box?
Link box, a box in which a cable sheath braking system is made. Sheath breaking prevents circulating currents and limits induced voltage in the cable
Nominal T model of a transmission line
Nominal T model of a medium transmission line has two components- series impedance and shunt admittance. In this post, we shall discuss the nominal T
Phase Fault Protection
Phase fault protection is used for protection of induction motor. The protection relay trips the motor in the case of fault. We can call the
What is Type 1 and Type 2 Coordination?
What is Type 1 and Type 2 Coordination? Type 1 and Type 2 coordination indicates the criteria of short-circuit performance of motor starter components. The