Burden Resistor calculation: Difference between revisions
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(Created page with " ==Burden Resistor Formulae== R = (Vcc * Turns) / (2√2 * Irms) R: Burdeb resistor value in Ohm Vcc: ADC max voltage range (usually 3.3V) Turns: Number of CT sensor turns ...") |
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==Burden Resistor Formulae== | ==Burden Resistor Formulae== | ||
R = ( | R = (Vadc * Nturns) / (2√2 * Irms) | ||
R: | '''R''': Burden resistor value in Ohm<br> | ||
'''Vadc''': ADC max voltage range (usually 3.3V)<br> | |||
'''Nturns''': Number of CT sensor turns (see specs). <br> | |||
Irms: Max current to be read in rms | :SCT-013-000 is 2000 turns.<br> | ||
:SCT-019 is 6000.<br> | |||
:SCT-006 is 800.<br> | |||
Nturns can be deduced dividing primary current by secondary current. For example the SCT-013-000 is rated as 100A/50mA. Therefore we get 100/0.05 = 2000 turns.<br> | |||
'''Irms''': Max current to be read in Ampere (rms)<br> | |||
==Current Coefficient Formulae== | |||
This will compute ICAL. | |||
ICAL = Nturns / R | |||
'''ICAL''': Current Coefficient<br> | |||
'''Nturns''': Number of CT sensor turns<br> | |||
'''R''': Burden resistor value in Ohm<br> | |||
Revision as of 21:12, 13 July 2020
Burden Resistor Formulae
R = (Vadc * Nturns) / (2√2 * Irms)
R: Burden resistor value in Ohm
Vadc: ADC max voltage range (usually 3.3V)
Nturns: Number of CT sensor turns (see specs).
- SCT-013-000 is 2000 turns.
- SCT-019 is 6000.
- SCT-006 is 800.
Nturns can be deduced dividing primary current by secondary current. For example the SCT-013-000 is rated as 100A/50mA. Therefore we get 100/0.05 = 2000 turns.
Irms: Max current to be read in Ampere (rms)
Current Coefficient Formulae
This will compute ICAL.
ICAL = Nturns / R
ICAL: Current Coefficient
Nturns: Number of CT sensor turns
R: Burden resistor value in Ohm