Derating Factor of Series Connected Thyristor String Calculator

✖Resultant series voltage of thyristor string is the resultant voltage of the series combination of n_s number of thyristors.ⓘ Resultant Series Voltage of Thyristor String [V_string]			+10% -10%
✖Worst case steady state voltage of thyristor is the voltage across thyristor 1 of the series string when I_D1=0 and ΔID = I_D2.ⓘ Worst Case Steady State Voltage [V_ss]			+10% -10%
✖Number of thyristors in series thyristor string is the quantity of thyristors in the series combination.ⓘ Number of Thyristors in Series [n]			+10% -10%

✖Derating factor of thyristor string is 1 minus the string efficiency of the series combination.ⓘ Derating Factor of Series Connected Thyristor String [DRF]

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Formula

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Derating Factor of Series Connected Thyristor String

Formula

DRF = 1 - \frac{V string}{V ss \cdot n}

Example

0.939653 = 1 - \frac{20.512 V}{113.3 V \cdot 3}

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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/(Worst Case Steady State Voltage*Number of Thyristors in Series)
DRF = 1-V_string/(V_ss*n)
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 n_s number of thyristors.
Worst Case Steady State Voltage - (Measured in Volt) - Worst case steady state voltage of thyristor is the voltage across thyristor 1 of the series string when I_D1=0 and ΔID = I_D2.
Number of Thyristors in Series - Number of thyristors in series thyristor string is the quantity of thyristors in the series combination.

STEP 1: Convert Input(s) to Base Unit

Resultant Series Voltage of Thyristor String: 20.512 Volt --> 20.512 Volt No Conversion Required
Worst Case Steady State Voltage: 113.3 Volt --> 113.3 Volt No Conversion Required
Number of Thyristors in Series: 3 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

DRF = 1-V_string/(V_ss*n) --> 1-20.512/(113.3*3)

Evaluating ... ...

DRF = 0.939652839070315

STEP 3: Convert Result to Output's Unit

0.939652839070315 --> No Conversion Required

FINAL ANSWER

0.939652839070315 ≈ 0.939653 <-- Derating Factor of Thyristor String

(Calculation completed in 00.004 seconds)

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< SCR Performance Parameters Calculators

Worst Case Steady State Voltage across First Thyristor in Series Connected Thyristors

Go Worst Case Steady State Voltage = (Resultant Series Voltage of Thyristor String+Stablizing Resistance*(Number of Thyristors in Series-1)*Off State Current Spread)/Number of Thyristors in Series

Derating Factor of Series Connected Thyristor String

Go Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series)

Leakage Current of Collector-Base Junction

Go Collector Base Leakage Current = Collector Current-Common-Base Current Gain*Collector Current

Thermal Resistance of SCR

Go Thermal Resistance = (Junction Temperature-Ambient Temperature)/Power Dissipated by Heat

< SCR Characteristics Calculators

Derating Factor of Series Connected Thyristor String

Go Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series)

Leakage Current of Collector-Base Junction

Go Collector Base Leakage Current = Collector Current-Common-Base Current Gain*Collector Current

Power Dissipated by Heat in SCR

Go Power Dissipated by Heat = (Junction Temperature-Ambient Temperature)/Thermal Resistance

Thermal Resistance of SCR

Go Thermal Resistance = (Junction Temperature-Ambient Temperature)/Power Dissipated by Heat

Derating Factor of Series Connected Thyristor String Formula

Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series)
DRF = 1-V_string/(V_ss*n)

What does the derating factor imply?

Derating factor is normally used to 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/(Worst Case Steady State Voltage*Number of Thyristors in Series) 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 (V_string), Worst Case Steady State Voltage (V_ss) & Number of Thyristors in Series (n) and hit the calculate button. Here is how the Derating Factor of Series Connected Thyristor String calculation can be explained with given input values -> 0.941159 = 1-20.512/(113.3*3).

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-V_string/(V_ss*n) or Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series). Resultant series voltage of thyristor string is the resultant voltage of the series combination of n_s number of thyristors, Worst case steady state voltage of thyristor is the voltage across thyristor 1 of the series string when I_D1=0 and ΔID = I_D2 & Number of thyristors in series thyristor string is the quantity of thyristors in the series combination.

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/(Worst Case Steady State Voltage*Number of Thyristors in Series). To calculate Derating Factor of Series Connected Thyristor String, you need Resultant Series Voltage of Thyristor String (V_string), Worst Case Steady State Voltage (V_ss) & Number of Thyristors in Series (n). With our tool, you need to enter the respective value for Resultant Series Voltage of Thyristor String, Worst Case Steady State Voltage & Number of Thyristors in Series 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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