Where (60Hz) is the Rogowski coil scale factor at 60Hz, and it represents
the coil sensitivity, measured in millivolts per ampere (mV/A)
at 60Hz.
Note: The scale factor KRogowski is
defined at the reference frequency fr = 60 Hz because the DI
(Digital Integrator) filter was designed for unity gain at 60
Hz. If it is desired to use KRogowski defined
at another frequency, the gain of the DI filter must be
accounted for in the computation as follows:
Where K_di(f) = 60 Hz/f.
For example, a Rogowski coil is used with an output of 500 uV/A at 60 Hz
(or 416.6 uV/A at 50 Hz) and a GPGA = 4, then,
KRogowski(60 Hz) = 1000000 / 500 = 2000
Klx = 2000 / 4 = 500
The metrology firmware uses uQ22.10 to represent both integer and
fractional numbers; therefore, the value to set is:
K_lx = ROUND(500 * 2^10) = 0x007D000
Note: The METER_TYPE control register must be
configured correctly: 0x00000CCC for CT, 0x00000DDD for SHUNT
and 0X00000EEE for Rogowski coil.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
