Product Profile of Three Elements Numerical Differential/ Over Current Protection Relay

Three Elements Numerical Differential/ Over Current Protection Relay enables Instantaneous Over-Current Protection with adjustable Timer and has the facility of Internal calculation of zero seq. EF current. The Differential/ Over Current Protection Relay also protects against negative sequence over current. Ashida Eletronics Pvt. Ltd., an ISO 9001:2008 certified company manufactures Three Elements Numerical Differential/ Over Current Protection Relay.

Ashida Eletronics Pvt. Ltd. Offers a wide range of electrical power protection relays, auxiliary protection relay and SCADA systems. The Three Elements Numerical Differential/ Over Current Protection Relay allows Programmable starting current and dual bias setting.

Salient features of the Three Elements Numerical Differential/ Over Current Protection Relay:

• Transformer Differential + Over Current + Restricted Earth Fault.

• 3 Element [3 Phase + 3Io] Over current IDMT/DMT with instant Trip.

• Selection of Curve: Five selectable curve- Normal Inverse, Very Inverse, Extremely Inverse, Long Time Inverse and Define Time.

• Programmable starting current and dual bias setting.

• Harmonic Restrain for Transformer charging and CT saturation condition.

• Unrestrained Differential Protection.

• Programmable Internal ICT [Interposing CT] ratio to match different transformer having different vector groups.

• In-built CB Trip Circuit Supervision function during pre closing and post closing of CB.

• Breaker Failure Detection.

• Disturbance Recorder. Up to 3 sec of actual waveform of current along with logical and physical status are captured and saved in the built-in memory, with date time stamping for analyzing fault condition & fault location.

• Fully communicable with IEC 60870-5-103.

• Continuously monitors the module`s internal hardware and alarm is generated in case of failure of any critical components

• Large 20X4 LCD display for Parameter and setting display. On site CT Secondary selection 1A or 5A.

• Very low burden on CT [less than 0.2VA]

• Operation based on fundamental frequency value.

• Latching of fault current value.

• 8 Digital Output contacts for local Alarm as well as Tele-signalling.