PURPOSE
The operation of electrical and electronic equipment can be affected by voltage dips, short interruptions or voltage variations of the supply. Voltage dips and short interruptions are mainly caused by faults in the DC distribution system or by sudden changes of large loads. Voltage variations are primarily caused by the switching of mechanical relays when changing from one source to another (e.g., from generator set to battery).
Specification
Rise and fall time of the voltage change, generator loaded with 100 Ω resistive load: Between 1 µs and 50 µs.
Test levels and durations for short interruptions
|
Test
|
Test Condition
|
Test level (% UT )
|
Duration (s)
|
|
Short interruptions
|
High impedance and/or Low impedance
|
0
|
0.001
|
|
0.003
|
|
0.01
|
|
0.03
|
|
0.1
|
|
0.3
|
|
1
|
|
x
|
Test levels and durations for voltage dips
|
Test
|
Test level (% UT )
|
Duration (s)
|
|
Voltage dips
|
40 and 70
or
x
|
0.01
|
|
0.03
|
|
0.1
|
|
0.3
|
|
1
|
|
x
|
Test levels and durations for voltage variations
|
Test
|
Test level (% UT )
|
Duration (s)
|
|
Voltage dips
|
85 and 120
Or
80 and 120
Or
x
|
0.1
|
|
0.3
|
|
1
|
|
3
|
|
10
|
|
x
|
View our solutions for DC Power Fail testing
