Rishabh RISH LM 1340 - Page 104

Impulse Constant
Depending on nominal system nominal power, the number of impulses are created to measure the
energy.The number of impulses for particular nominal power is set which indicates 1kWh
energy.Energy can be Watt,VA or Var.Following table shows impulses corresponding to nominal
system energy.
System nominal power
Impulse constant
<=100
64000*
<=200
32000*
<=400
16000
<=800
8000
<=1600
4000
<=3200
2000
>3200
1000
1. For per phase / 1P2W System Energy,
Nominal Power = PT Sec (LL) * CT Sec / 1.732
2. For Three Phase System Energy,
Nominal Power = 3 * PT Sec (LL) * CT Sec / 1.732
*Note :
Impulse Constant of 16000 and 32000 are applicable for 1P2W System and per phase energy of
Three Phase System.
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