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UMG 508TransientsTransient voltages are rapid, impulsive transientoscillation processes in electrical networks.Transient voltages are not predictable with respectto time and last for a limited period.Transient voltages are caused by the effects oflighting, due to switching operations or the triggeringof fuses.• The UMG508 recognizes transients that arelonger than 50µs.• The UMG508 monitors the voltage measurementinputs on transients.• Transient monitoring can be set per phase.• There are two independent criteria for recognizingtransients.• If a transient has been recognized, the waveshape is saved in a transient recording.• If a transient has been recognized, the limitvalue is automatically increased by 20V, bothin automatic and manual modes. This automaticincrease of the limit value fades within10 minutes.• If another transient is recognized within thenext 60 seconds, this transient is recordedwith 512 points.• You can display recorded transients with theGridVis incident browser.54