Product Profile of Numerical Single Pole OC/EF Protection Relay Design

Ashida electronics pvt. Ltd. Designers, developer & manufacturers of electrical power protection relays & scada systems. The company has obtained iso 9001:2000 certifications from m/s. Bvqi, u.K. Ashida electronics pvt. Ltd offers ashida numerical single pole oc/ef protection relay design adr111a available to meet demand of low and medium switchgear control. The adr111a is single pole oc/ef relay with instantaneous high set and programmable output to simplify feeder protection wiring. The adr111a continuously monitors earth current, through ct connections. The high-speed micro-controller samples this current through a 12-bit a/d converter. Each input current is also displayed on 16 x 2 lcd display for metering. The relay is having main three functions 1] protection 2] self- supervision 3] measurement. The key features of the ashida numerical single pole oc/ef protection relay design are:

• Single element ef idmt with instant trip.

• Back - lit lcd display for settings.

• Display of fault current / load current.

• Selection of curve: six selectable curves [normal inverse 1 [c1], normal inverse 2 [c2], very inverse [c3], extremely inverse [c4], long time inverse [c5] & definite time [c6].

• Design using dsp technology.

• Latching of fault current up-to last 5 fault.

• Password protection for setting.

• Site selectable ct secondary [for model am00x02/x03]

• Relay can be made either idmt or define time.

• Programmable operating time in instantaneous element

• Breaker fail function [for model am00x02/x03]

• Suitable for ref protection [am002xx]

• Scada compatibility [rs232 and rs485 communication for model adr211a]