Product Profile of Numerical OC/EF Protection Relay

Ashida electronics pvt. Ltd. Designers, developer & producers of electrical power protection relays & scada systems. The company has achieved iso 9001:2000 certifications from m/s. Bvqi, u.K. Ashida electronics pvt. Ltd offers ashida numerical oc/ef protection relay adr131a design available with three main function are: a] protection b] self-supervision c] measurement. The ashida numerical oc/ef protection relay adr131a is designed to meet demand of low and medium switchgear control. The adr131a is a 2oc and 1ef relay with instantaneous high set and programmable output to simplify feeder protection wiring. The adr131a continuously monitors all 2 phase and 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 the relay can be supplied with different model. It can be either definite time or idmt. The prime features of the ashida numerical oc/ef protection relay

• 3 element [2 phase + ef] over current idmt with instant trip.

• Programmable [non- volatile] setting by local keys.

• Back - lit lcd display for settings.

• Display of fault current / load current.

• Selection of curve: six selectable curves [normal inverse1 [c1], normal inverse2 [c2], very inverse [c3], extremely inverse [c4], long time inverse [c5] & definite time [c6].

• Separate curve selection for phase and ef

• Design using dsp technology.

• Latching of fault current up-to last 5 fault

• Password protection for setting.

• Relay can be made ether idmt or define time

• Programmable operating time in instantaneous element