Derating factor of series connected thyristor string Solution

STEP 0: Pre-Calculation Summary
Formula Used
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-(Vs/(ns*VDS(max)))
This formula uses 4 Variables
Variables Used
Derating factor of thyristor string - Derating factor of thyristor string is 1 minus the string efficiency of the series combination.
Resultant series voltage of thyristor string - (Measured in Volt) - 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 - Number of thyristors in series thyristor string is the quantity of thyristors in the series combination.
Worst case steady state voltage of thyristor 1 - (Measured in Volt) - Worst case steady state voltage of thyristor 1 is the voltage across thyristor 1 of the series string when ID1=0 and ΔID = ID2.
STEP 1: Convert Input(s) to Base Unit
Resultant series voltage of thyristor string: 20 Volt --> 20 Volt No Conversion Required
Number of thyristors in series thyristor string: 3 --> No Conversion Required
Worst case steady state voltage of thyristor 1: 10 Volt --> 10 Volt No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
DRF = 1-(Vs/(ns*VDS(max))) --> 1-(20/(3*10))
Evaluating ... ...
DRF = 0.333333333333333
STEP 3: Convert Result to Output's Unit
0.333333333333333 --> No Conversion Required
FINAL ANSWER
0.333333333333333 <-- Derating factor of thyristor string
(Calculation completed in 00.000 seconds)

Credits

Created by Devyaani Garg
Shiv Nadar University (SNU), Greater Noida
Devyaani Garg has created this Calculator and 50+ more calculators!
Verified by Payal Priya
Birsa Institute of Technology (BIT), Sindri
Payal Priya has verified this Calculator and 1900+ more calculators!

10+ Thyristors Calculators

Excess work due to thyristor 1 in chopper circuit
Excess energy in chopper circuit = 0.5*Reverse di/dt limiting inductance*((Load current of chopper circuit+(Reverse Recovery Time*Commutation capacitor voltage)/Reverse di/dt limiting inductance)-(Load current of chopper circuit^2)) Go
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
Maximum Thyristor gate voltage for resistance firing circuit
Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)) Go
Derating factor of series connected thyristor string
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)) Go
Power dissipated by heat in SCR
Power dissipated by heat in SCR = (SCR junction temperature-SCR ambient temperature)/Thermal resistance of SCR Go
Thermal resistance of SCR
Thermal resistance of SCR = (SCR junction temperature-SCR ambient temperature)/Power dissipated by heat in SCR Go
Leakage Current of Collector-Base Junction
Collector to base leakage current = Collector current-(Common-base current gain.*Emitter current) Go
Discharging current of dv/dt protection thyristor circuits
Discharging current of thyristor circuit = Input voltage/((Resistance 1+Resistance 2)) 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-(Vs/(ns*VDS(max)))

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 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) & 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 & 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) & 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 & 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.
Share Image
Let Others Know
Facebook
Twitter
Reddit
LinkedIn
Email
WhatsApp
Copied!