Micro controller based three phase differential relay  study trainer  (merz -price protection scheme)

MICRO CONTROLLER BASED DIFFERENTIAL RELAY

• One no. of PIC Micro controller used as processor to read all current, (PY, SY) & activation of relay function.
• One number LCD to indicate Current & Time Constants.
• Four no. of key used for Set Point Adjustments.
• Six number of 5A CT used to sense primary and secondary current.
• One no. of 24V TPTT auxiliary relay used for contractor operation.

SPECIFICATION:

• Current input: 0-5Amp
• Voltage input: 0-230V
• Three number NO contact @ 220V, 5 Amp rating.
• Auxiliary supply: 230V AC, 50Hz

• Power ON/OFF switches with indicator.

 THREE PHASE TRANSFORMER SET-UP

• One no. of 24/24V three phase transformer with primary and secondary side inter winding termination for fault creation.
• Star-star connection.
• One no. of 415V/48V three phase transformers provided for fault transformer input voltage.
• Three phase lamp load provided
• Types of fault L-L, L-N can be created used termination.
• One no of rheostat provided for variation of short circuit resistance.