Temporary Overvoltages

ION 7500 / ION 7600 User’s Guide	Temporary Overvoltages

Overvoltage detection is based on half-cycle RMS measurements.The duration of the overvoltage corresponds to the period during which the RMS value remains more than 110% of the nominal voltage. The magnitude of the overvoltage is defined as the ratio (expressed in %) between the maximum RMS voltage during the overvoltage and the nominal voltage.

The observation period is 1 week. No evaluation criteria are suggested by either the EN 501060 standard or the UNIPEDE Measurement Guide for Voltage Characteristics; you should apply your own criteria to the data captured by the meter. The table below defines the classification scheme for counters Nij:

Overvoltages / Duration “t”	t < 1s	1s <= t < 1 min	t >= 1 min

110 < magnitude <= 120 %	N11	N21	N31
120 < magnitude <= 140 %	N12	N21	N32
140 < magnitude <= 160 %	N13	N23	N33
160 < magnitude <= 200 %	N14	N24	N34
magnitude > 200 %	N15	N25	N35

EN 50160 data (current observation period): The meter maintains the counters listed in the table above for each phase. These counters are reset on a weekly basis.

EN 50160 data (previous observation period): The meter stores the counter values listed in the table above for each phase on a weekly basis before these counters are reset. These registers are also stored in a data recorder on a weekly basis.

Events: the meter creates a message in the Event log every time one of the counters increases.

Parameter data: The meter can be enabled to record the maximum RMS voltage for each phase during an overvoltage, the duration of the overvoltage and the timestamp for when the overvoltage occurred.

Overvoltages Default Measurements

The data below is from the present observation period; values are all located in Bin modules. They are also recorded weekly by Data Recorders 25, 26, and 27.

Register Labels

V1-Ovrvlt N11	V1-Ovrvlt N12	V1-Ovrvlt N13	V1-Ovrvlt N14	V1-Ovrvlt N15

V1-Ovrvlt N21	V1-Ovrvlt N22	V1-Ovrvlt N23	V1-Ovrvlt N24	V1-Ovrvlt N25

V1-Ovrvlt N31	V1-Ovrvlt N32	V1-Ovrvlt N33	V1-Ovrvlt N34	V1-Ovrvlt N35

V2-Ovrvlt N11	V2-Ovrvlt N12	V2-Ovrvlt N13	V2-Ovrvlt N14	V2-Ovrvlt N15

V2-Ovrvlt N21	V2-Ovrvlt N22	V2-Ovrvlt N23	V2-Ovrvlt N24	V2-Ovrvlt N25

V2-Ovrvlt N31	V2-Ovrvlt N32	V2-Ovrvlt N33	V2-Ovrvlt N34	V2-Ovrvlt N35

Power Quality: ION Meters and EN50160 Technical Note

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Multi-Tech Systems 7500, 7600 manual Temporary Overvoltages, Overvoltages Default Measurements

Models: 7500 7600

ION 7500 / ION 7600 User’s Guide