PURPOSE
Electrical and electronic equipment can be affected by voltage dips, short interruptions or voltage variations of the supply. Voltage dips and short interruptions occur due to faults in a network or in installations by sudden changes of large loads. In certain cases, two or more consecutive dips or interruptions can occur. Voltage variations are caused by continuously varying loads connected to the network.
Test levels and durations for short interruptions
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Classa
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Test levels and durations for short interruptions (ts) (50 Hz/60Hz)
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Class 1
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Case-by-case according to the equipment requirements
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Class 2
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0% during 250/300c cycles
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Class 3
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0% during 250/300c cycles
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Class Xb
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X
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a. Classes as per IEC 61000-2-4, see Annex B
b. To be defined by product committee. For equipment connected directly or indirectly to the public network, the levels shall not be less severe than class 2
c. “250/300 cycles” means “250 cycles for 50 Hz test” and “300 cycles for 60 Hz test”
Detailed view of rise and fall time
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Short interruption
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Test levels and durations for voltage dips
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Classa
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Test levels and durations for short interruptions (ts) (50 Hz/60 Hz)
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Class 1
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Case-by-case according to the equipment requirements
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Class 2
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0 % during ½ cycle
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0 % during 1 cycle
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70 % during 25/30c cycles
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Class 3
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0 % during ½ cycle
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0 % during 1 cycle
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40 % during 10/12c cycles
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70 % during 25/30c cycles
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80 % during 250/300c cycles
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Class Xb
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X
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X
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X
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X
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X
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a. Classes as per IEC 61000-2-4, see Annex B
b. To be defined by product committee. For equipment connected directly or indirectly to the public network, the levels shall not be less severe than class 2
c. “25/30 cycles” means “25 cycles for 50 Hz test” and “30 cycles for 60 Hz test”
Voltage dip: 40 %
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Specification
Voltage rise (and fall) time during abrupt change, generator loaded with 100 Ω resistive load: Between 1 µs and 5 µs.
Test Set-up
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Timing of short-term supply voltage variations
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Voltage test level
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Time for decreasing voltage (td)
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Time at reduced voltage (ts)
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Time for increasing voltage (ti) (50 Hz/60 Hz)
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70 %
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Abrupt
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1 cycle
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25/30b cycles
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Xa
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Xa
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Xa
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Xa
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a. To be defined by product committee
b. “25/30 cycles” means “25 cycles for 50 Hz test” and “30 cycles for 60 Hz test”
Voltage variation
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