Micro controller based sequence current relay test set up This set up is designed to study the working principle of Negative sequence current protection of three phase Ac – source / alternator, It consists of MICRO CONTROLLER BASED NEGATIVE SEQUENCE CURRENT RELAY One no. of PIC Micro controller used as processor to read Three phase Ac current, & activation of relay function. One number LCD to indicate current & Time Constants. Four no. of key used for set point adjustments Three number of 5A CT used to sense three phase current. One no. of 12V Auxiliary relay used for contractor operation. Four no of LED’s provided to indicate the un biased, Alarm, trip & DMT operation SPECIFICATION:Current input: 5Amp One Number “NO”&”NC” contact @ 220V, 5Amp\ rating. Auxiliary supply: 230V AC, 50Hz Power ON/OFF switches with indicator.