BLOCK FILTER UNIT

The Block Filter Units are arranged in Single Line and Double Line Block Circuits for the protection of instruments as well as staff from the influence of inducted voltage in 25KV AC Electrified Section. This unit consists of 4 Nos. of Chokes, 2 Nos. of 4 Terminals of condensers, 2 Nos. of Lightening Discharges wired as shown in the sketch. The Chokes L1, L2, L3 and L4 are wound on stalloy cores and fixed in a metallic box and filled with insulating compound and sealed. 4 Terminal condensers (Sealed Type) are used to block DC path. The Equipment uses 2 Nos. of Gas Discharge Tubes for further protection. The mechanical construction of the Equipment is rugged and the unit can be wall mounted as per Drawing No. RDSO/TC/33075. It is of tropical finish and capable of working satisfactorily under conditions of Temperature, Humidity and Dust normally encountered in service conditions. All exposed parts are plated, painted or otherwise protected against corrosion. The Equipment is supplied with a M.S Bracket and Rag Bolts for Wall Mounting.