What is an overcurrent relay?
An overcurrent relay is an electrical protection device designed to cut off the power supply to a circuit, appliance, or machine in the event of an overload or failure. These devices typically consist of a manual circuit breaker or contactor and a current sensing relay which interlocks with it.
What is OC and EF relay?
ADR131A – Non Communicable 2 OC + 1 EF The ADR131A is a three element numerical relay can having following option , 2 OC +1 EF or 3EF relay with Instantaneous high set and programmable output to simplify feeder protection wiring. ANSI. Protection Functions. 50. Instantaneous Over current Protection (OC-Inst.)
What are self powered relays?
The concept “Self-Power” defines the supplying mode of electronic protection relays for Medium Voltage. It means that there is no need for auxiliary voltage to power the relay and that the energy is obtained directly from the line that we are protecting.
What is feeder protection?
Feeder protection, or more exactly protection for overhead lines and cables, is the most commonly used type of protection. The protection has to ensure that the power grid continues to supply energy. In case of a fault, it must be prevented from spreading to healthy parts of the network.
What is the difference between earth relay and overcurrent relay?
Over load relays are used in control and power circuits to protect the motor from over load /over current. Earth fault relay that means phase to ground fault will occur the relay gets activated but phase relay means phase to phase fault, open circuit fault and short circuit fault occuring that relay gets activated.
What is OCEF relay?
Definition: The overcurrent relay is defined as the relay, which operates only when the value of the current is greater than the relay setting time. It protects the equipment of the power system from the fault current.
What are earth faults?
A fault is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other. Earth scientists use the angle of the fault with respect to the surface (known as the dip) and the direction of slip along the fault to classify faults.
Where is MHO relay used?
Abstract: Mho distance relays are widely used for the protection of uncompensated and series compensated transmission lines in order to determine the presence and location of faults.
What is Idmt?
IDMT relay is inverse definite minimum time relay. It is one in which Time of operation is inversely proportional to magnitude of fault current near pickup value and becomes substantially constant slightly above the pickup value of the Relay.
Why choose Ashida Auxiliary Relays?
With 47 Years of experience Ashida offers Auxiliary Relays for all applications like; To multiply the contacts of Protection Relay. For Low burden sensitive relay. To give Alarm, Control, Indications and other auxiliary duties in AC and DC system.
Who is Ashida electronics?
ASHIDA is a leading numerical protection relay manufacturer & supplier of a complete range of electrical numerical protection relay, static & automation. Ashida Electronics has 47 years excellence in electrical relay & also providing on-site replacement warranty. Home
Why choose Ashida control&relay panels?
Control & Relay Panels Ashida has manufactured & supplied Control & Relay Panels to most utilities in India. These are specially engineered solutions to suit the requirements of the clients. The CRPs are installed in substation environment right from 11kV to 220 kV voltage levels.
Why choose Ashida?
ASHIDA has more than 45 years of experience in control and relay panel. Ashida manufactures all types of Control and Relay Panel. We have in-house dedicated team for R&D which focuses on innovation and customized design. Focus is always on reducing setup time while enhancing reliability & efficiency.