Electrical Adda

1.    Full load current of any motor based on HP,                                     Full load current = 1.5 x H.P                                      For 5 hp motor full load current = 1.5 x 5                                                                = 7.5 A 2.    Capacitor Bank for any Industry = 1/3 x Total H.P of             Company       Ex- For 15000hp capacity industry capacitor bank = 1/3 x 15000...

ACB tripping settings   Acb has 6 adjustable tripping settings 1 Long time delay (Tr ) 2 Short time delay( Tsd ) 3 Earth fault delay (Tg) 4 Long time (Ir) 5 Short time (Isd) 6 Earth Fault (Ig) Long time is for maximum overload capacity . Short time is for short circuit current Earth fault is for earth fault current . As per thumb Rule : 1. Long time set at 0.8 means 80% of full load current .Until this level of current  breaker carry without tripping  . Above 0.8 Acb trips. Long time delay causes the breaker to wait for certain time to allow heavy temporary inrush currents to pass away. Generally long time delay is set at  4 Sec. 2. Short time set at 0.6 means  60% of full load current . It determines the Amount of Current the Breaker will carry for short time period.  Generally short time delay set at 0.2 sec. 3. Earth Fault set at 0.3 or 30% of  fault current . It controls the amount of Ground Fault current that will caus...

SUBSTATION GROUND CLEARANCES Nominal System Voltage     Clearance in meters  (Minimum) 11KV        2.75m 33KV        3.7 m 66KV        4.0 m 132KV        4.6m 220KV        5.5m 440KV        8.1m Minimum Clearances (meters) 33KV 132kv 220kv 400kv 765kv Phase –Phase  (meters) 0.320  1.3   2.1  4.2   9.4 Phase-Earth    (meters) 0.320  1.3  2.1  3.5   6.4 Sectional clearance  (meters)  3.0 ...

                             Internal view of VCB                                                                     36KV VCB 1250A Details of VCB Breaker Panel VCB  consists Operating Rod, Tripping Coil, Closing coil , Drop out fuses main arching chamber present above breaker panel ,operating rod is connected to arch interrupting chamber.  VCB is charged by rotating handle clockwise makes closing coil compressed and by pressing close  button VCB contacts gets closed & connected to 33kv supply line. Porcelain Clad Vacuum CB    (CROMPTON GREAVES ) VOLTAGE: 36KV                 BREAKING CURRENT :  25KA   CURRENT : 1250A...

HT VCB : Iron Clad Floor Mounted of  11KV, 800A, VCB LT ACB:440V Indoor ACB 

Cable Size for home Appliances        1.    Refrigerator                                                              3CX 0.75 Sq mm 1.1KV, 200W     2.    Television                                                          3CX 0.75Sq mm 1.1KV, 150W     3.      Electric Water Heater                    ...