User Documentation

143
Devices – Energy Analyser 550
2008050000/03/02-2018
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• The threshold values are set for excess voltage, undervoltage, voltage interruption and overcurrent as a
percentage of the nominal values.
• Threshold values can be switched off by switching the Manual/Off button to Off.
4.4.3.11 Event recording
• Effective values recorded in the Energy Analyser 550 describe the change in half wave effective values.
• Effective value recording can be started by an event.
• Various recording modes can be selected to record effective values triggered by an event.
- Only the value in which the event was found.
- Only voltage and current in the phase in which the event was found.
- All of the inputs of the value in which the event was found.
- All of the values in all of the inputs
• The length of the effective value record is determined by the number of half wave effective values up to
the beginning of the event (pre-run) and by the number of half wave effective values after the beginning
of the event (after-run).
4.4.3.12 Transients
• Transients are fast voltage changes.
• TheEnergyAnalyser550recognisestransientsiftheyarelongerthan50μs,althoughitonlymonitors
voltage measurement inputs.
• There are three independent criteria by which transients are recognised.
- Absolute: If a sampled value exceeds the set threshold, a transient is recognised.
- Available settings:
- Off - transient monitoring has been switched off
- Automatic - the threshold value is calculated automatically and comes to 110 % of the current
200 ms effective value.
- Manual - the transient monitoring uses the set threshold values.
• Fast increase: If the difference between two neighbouring sampled points exceeds the set threshold, a
transient is recognised.
- Available settings:
- Off - transient monitoring has been switched off.
- Automatic - the threshold value is calculated automatically and comes to 0.2175 times the current
200 ms effective value.
- Manual - the transient monitoring uses the set threshold values.
• Envelope: If a set threshold value has been exceeded, a transient is recognised.
- Available settings:
- Off - transient monitoring has been switched off.
- Automatic - the threshold value is calculated automatically.
- Manual - the transient monitoring uses the set threshold values.
• If a transient has been recognised, the threshold value increases by 20 V, both in automatic and in man-
ual mode.