- Location
- Illinois
- Occupation
- retired electrician
I asked the supplier for the inrush currents for a 30 KVA transfomer so I could make sure the primay OCPD would not trip from the inrush current. They sent me the following sheet.
What is the information in the last table, "integral of I squared" used for?
TYPICAL CALCULATED INRUSH CURRENT
MODEL NO. 9T83B3872G01
RATING 3PH 60HZ 30.0KVA 480 +2 -4(2.4%TAPS) 208Y/120
INPUT VOLTS 480.00 480.00
FREQUENCY - HZ 60.00 60.00
1. PEAK AMPERES MAXIMUM
CYCLE 1 460.66 460.66
CYCLE 2 308.84 308.84
CYCLE 3 222.40 222.40
CYCLE 4 168.15 168.15
CYCLE 5 131.74 131.74
CYCLE 6 106.08 106.08
CYCLE 7 87.29 87.29
CYCLE 8 73.11 73.11
CYCLE 9 62.14 62.14
CYCLE 10 53.47 53.47
2. AMPERES AVERAGE MAXIMUM
CYCLE 1 134.93 134.93
CYCLE 1 THRU 2 103.61 103.61
CYCLE 1 THRU 3 83.64 83.64
CYCLE 1 THRU 4 69.86 69.86
CYCLE 1 THRU 5 59.83 59.83
CYCLE 1 THRU 6 52.22 52.22
CYCLE 1 THRU 7 46.27 46.27
CYCLE 1 THRU 8 41.50 41.50
CYCLE 1 THRU 9 37.59 37.59
CYCLE 1 THRU 10 34.34 34.34
3. INTEGRAL OF I SQUARED
CYCLE 1 816.3 816.3
CYCLE 1 THRU 2 1111.3 1111.3
CYCLE 1 THRU 3 1240.0 1240.0
CYCLE 1 THRU 4 1303.6 1303.6
CYCLE 1 THRU 5 1338.1 1338.1
CYCLE 1 THRU 6 1358.1 1358.1
CYCLE 1 THRU 7 1370.4 1370.4
CYCLE 1 THRU 8 1378.2 1378.2
CYCLE 1 THRU 9 1383.5 1383.5
CYCLE 1 THRU 10 1387.1 1387.1
PREPARED BY: Prajwal DATE: MAY 30, 2002
What is the information in the last table, "integral of I squared" used for?