Devyaani Garg
Shiv Nadar University (SNU), Greater Noida
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Payal Priya
Birsa Institute of Technology (BIT), Sindri
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3 Other formulas that you can solve using the same Inputs

Worst case steady state voltage across first thyristor in series connected thyristors
Worst case steady state voltage of thyristor 1=((Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string -1)*Resistance*Off state current spread of thyristor string))/Number of thyristors in series thyristor string GO
Voltage across first thyristor in series-connected thyristors
Voltage across thyristor 1 in thyristor string=(Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string -1)*Resistance*Off state current spread of thyristor string)/Number of thyristors in series thyristor string GO
Resultant series voltage of series connected thyristor string
Resultant series voltage of thyristor string=Number of thyristors in series thyristor string *Voltage across thyristor 1 in thyristor string-(Number of thyristors in series thyristor string -1)*Resistance*Off state current spread of thyristor string GO

Derating factor of series connected thyristor string Formula

Derating factor of thyristor string=1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string *Worst case steady state voltage of thyristor 1))
DRF=1-(V<sub>s</sub>/(n<sub>s</sub>*V<sub>DS(max)</sub>))
More formulas
Leakage current of the collector-base junction GO
Excess work due to thyristor 1 in chopper circuit GO
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Voltage across first thyristor in series-connected thyristors GO
Worst case steady state voltage across first thyristor in series connected thyristors GO
Resultant series voltage of series connected thyristor string GO

What does the derating factor imply?

Derating factor is normally used the increase the reliability of the string because if we subtract string efficiency from 1, we get the reliability of the string.

How to Calculate Derating factor of series connected thyristor string?

Derating factor of series connected thyristor string calculator uses Derating factor of thyristor string=1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string *Worst case steady state voltage of thyristor 1)) to calculate the Derating factor of thyristor string, The Derating factor of series connected thyristor string formula is 1 minus the string efficiency of the series combination. Derating factor of thyristor string and is denoted by DRF symbol.

How to calculate Derating factor of series connected thyristor string using this online calculator? To use this online calculator for Derating factor of series connected thyristor string, enter Resultant series voltage of thyristor string (Vs), Number of thyristors in series thyristor string (ns) and Worst case steady state voltage of thyristor 1 (VDS(max)) and hit the calculate button. Here is how the Derating factor of series connected thyristor string calculation can be explained with given input values -> 0.333333 = 1-(20/(3*10)).

FAQ

What is Derating factor of series connected thyristor string?
The Derating factor of series connected thyristor string formula is 1 minus the string efficiency of the series combination and is represented as DRF=1-(Vs/(ns*VDS(max))) or Derating factor of thyristor string=1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string *Worst case steady state voltage of thyristor 1)). Resultant series voltage of thyristor string is the resultant voltage of the series combination of ns number of thyristors, Number of thyristors in series thyristor string is the quantity of thyristors in the series combination and Worst case steady state voltage of thyristor 1 is the voltage across thyristor 1 of the series string when ID1=0 and ΔID = ID2.
How to calculate Derating factor of series connected thyristor string?
The Derating factor of series connected thyristor string formula is 1 minus the string efficiency of the series combination is calculated using Derating factor of thyristor string=1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string *Worst case steady state voltage of thyristor 1)). To calculate Derating factor of series connected thyristor string, you need Resultant series voltage of thyristor string (Vs), Number of thyristors in series thyristor string (ns) and Worst case steady state voltage of thyristor 1 (VDS(max)). With our tool, you need to enter the respective value for Resultant series voltage of thyristor string, Number of thyristors in series thyristor string and Worst case steady state voltage of thyristor 1 and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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