Lifetime Capacitor 10-Kelvin rule from Arhenius law
where
L2: Test time in hours
L1: Projected life expectancy in hours
T1: Test temperature applied
T2: Temperature at which the life is projected
b : 10 for organic substance
This rule predicts the organic polymers that every 10°C increase
in application temperature over test result in half in the life.
Voltage Power Law
where
L1: Test time in hours
L2: Projected life expectancy in hours
V1: Test voltage applied
V2: Voltage at which the life is projected
n : voltage stress ratio
n=2, 0.25Vmax < V < 0.50 Vmax
n=3, 0.50Vmax < V < 1.00 Vmax
n=5, 1.00Vmax < V < 1.40 Vmax
𝑇1 −𝑇2
𝑉2
𝐿1 = 𝐿2 ∙ [ ]𝑛 ∙ 2( 10 )
𝑉1
𝐿1 = 𝐿2 ∙ 2(
𝑉2
𝐿1 = 𝐿2 ∙ [ ]𝑛
𝑉1
T2: 25.0°C; T1: 51.0°C
𝐿1 = 𝐿2 ∙ 2
(
51−25
)
10
= 6.063 𝐿2
T2: 25.0°C; T1: 47.5°C
𝐿1 ′ = 𝐿2 ′ ∙ 2
(
47.5−25
)
10
= 4.757 𝐿2
𝐿
∴ 𝐿 1′ = 1.28
1
T2: 25.0°C
T1’: 47.5°C
L1’ = L2* 2^[(47.5-25)/10] =4.757 L2
𝑇1 −𝑇2
)
𝑏