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UMG 512
Transients
Transient voltages are fast impulse transient effects
in electrical networks. The time when transient voltages
occur cannot be predicted and they have a limited
duration.
Transient voltages are caused by lightning strikes,
switching operations or by tripped fuses.
• The UMG 512 detects transients that are longer than
39µs.
• The UMG 512 monitors the measurement inputs for
transients.
• There are two independent criteria by which transients
are detected.
• If a transient has been detected, the wave form will
be saved to a transient record.
• If a transient has been detected, the threshold value
increases by 20V, both in automatic and in manual
mode. This automatic increase of the threshold value
switches off within 10 minutes.
• If a further transient is detected within the next 60
seconds, it will be recorded with 512 points.
• The GridVis event browser can display recorded
transients.
Mode (absolute)
If a sampled value exceeds the set threshold value,
a transient is detected.
• Off
- Transient monitoring has been switched off.
• Automatic
- Factory default setting. The threshold
value is calculated automatically and is 110% of
the current 200ms effective value.
• Manual
- The transient monitoring uses
the configurable threshold values under "Peak".
Summary of Contents for UMG 512
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