HIGH VOLTAGE ENGINEERING
High-voltage impulse generator with stacked capacitors and insulator columns in a testing laboratoryHIGH VOLTAGE TEST LABORATORY
01 / CALCULATOR

Impulse voltage correction

LIVE CALCULATION
GENERATOR OUTPUTU_act
169.96kV
Atmospherically corrected impulse voltage
Air density δ0.9998
Humidity k1.0000
Total Kt0.9998
Humidity safety cap activeh ≥ 11 g/m³

Test conditions

20 °C
10 °C40 °C
1013 hPa
980 hPa1030 hPa
11.0 g/m³
5 g/m³25 g/m³
Relative humidity 63.8%Magnus formula
02 / ENGINEERING

Calculation breakdown

10-decimal precision
δ = (P / 1013.25) × (293.15 / (273.15 + T))
δ = (1013 / 1013.25) × (293.15 / (273.15 + 20))
δ = 0.9997532692

Air density relative to the standard reference atmosphere. Pressure is expressed in hPa and temperature in °C.

P₀ 1013.25 hPaT₀ 293.15 Kh₀ 11 g/m³
Relative humidity calculation
P_sat = 6.112 × exp(17.62 × T / (243.12 + T))
P_sat = 23.3259602210 hPa
P_v = h × (T + 273.15) / 216.7 = 14.8807106599 hPa
RH = (P_v / P_sat) × 100 = 63.7946327565%

Saturation / condensation warning is triggered when RH > 100%. Atmospheric pressure is not used in this calculation.

Technical calculation report

Test conditions, correction factors and required output.

03 / KNOWLEDGE BASE

Engineering notes & FAQ

Impulse Lab / v6.7IEC 60060-1 · Standard reference atmosphere
HIGH VOLTAGE ENGINEERING

Technical Calculation Report

Impulse Voltage Atmospheric Correction (IEC 60060-1)

Date:

1. Ambient Test Conditions

Target BIL (U_test)170 kVAir pressure (P)1013 hPa
Temperature (T)20 °CAbsolute humidity (h)11.0 g/m³
Relative humidity63.8%

2. Atmospheric Correction Calculations

Relative Air Density Factor (δ)

δ = (P / 1013.25) × (293.15 / (273.15 + T))
δ = 0.9997532692

Humidity Correction Factor (k) [Safety Capped]

h ≥ 11 g/m³ → k = 1
k = 1.0000000000

Total Correction Factor (Kt = δ × k): 0.9997532692

REQUIRED OUTPUT: 169.96 kV

Medelec · Impulse Lab v6.7 · Technical calculation report