Circutor AR5-L Instruction Manual page 5

Values to be user-programmed:
- Rated Voltage :
- Voltage limits : From 100% to 50% of peak voltage
- Trigger Level :
- Rated Frequency: Fn = 45 to 65 Hz
Calculated parameters :
- Scale : Auto-scaling according to the rated voltage.
- Scale 1 : Rated voltage from 151 V to 500 V ( multiplied x 1 )
- Scale 2 : Rated voltage from 10 V to 150 V
- Sampling time : tm = 500 µ s ( constant ) .
Maximum slope = ( Vp · sin ϕ ) · trigger level = Vp · ( 2 π · tm / P ) · TL
Example of maximum slope determination
Vn = 220 V
Trigger Level = TL = 1.5
% limit = 75%
Fn = 50 Hz.
Sampling time = tm = 500 µ s
Period = P = 1/Fn = 20 ms
Vpeak = Vp = Vn · √2 = 220 V · √2 = 311.12 V
Maximum slope = Vp · sin ϕ · trigger level = Vp · (2 π · tm / P) · TL
= 311.12 · (2 π · 0.5 ms / 20 ms ) · 1.5 = 73 V .
Some disturbance examples:
Some examples of common power line disturbances, are shown on following
figures:
Vn = 10 to 500 V
TL = de 1.2 a 5
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Figure 1
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(multiplied x 2 )