MI 2883 Energy Master
Theory and internal operation
150
90 % of the nominal voltage of the nominal voltage. Collected voltage dips are classified
according to the following table.
Table 5.8:Voltage dips classification
Residual
voltage
Duration (ms)
10 ≤ t ≤ 200 200 < t ≤
500
500 < t ≤
1000
1000 < t ≤
5000
5000 < t ≤ 60000
90 >
U ≥ 80 Cell A1
Cell A2
Cell A3
Cell A4
Cell A5
80 > U ≥ 70 Cell B1
Cell B2
Cell B3
Cell B4
Cell B5
70 > U ≥ 40 Cell C1
Cell C2
Cell C3
Cell C4
Cell C5
40 > U ≥ 5
Cell D1
Cell D2
Cell D3
Cell D4
Cell D5
U < 5
Cell E1
Cell E2
Cell E3
Cell E4
Cell E5
5.2.9 Voltage swells
Voltage swells are typically caused by switching operations and load disconnections.
Conventionally, the start threshold for swells is equal to the 110 % of the nominal
voltage. Collected voltage swells are classified according to the following table.
Table 5.9:Voltage swell classification
Swell voltage
Duration (ms)
10 ≤ t ≤ 500
500 < t ≤ 5000
5000 < t ≤ 60000
U ≥ 120
Cell A1
Cell A2
Cell A3
120 > U > 110 Cell B1
Cell B2
Cell B3
5.2.10
Short interruptions of the supply voltage
Under normal operating conditions the annual occurrence of short interruptions of the
supply voltage ranges from up to a few tens to up to several hundreds. The duration of
approximately 70 % of the short interruptions may be less than one second.
5.2.11
Long interruptions of the supply voltage
Under normal operating conditions the annual frequency of accidental voltage
interruptions longer than three minutes may be less than 10 or up to 50 depending on
the area.
5.2.12
Energy Master recorder setting for EN 50160 survey
Energy Master is able to perform EN 50160 surveys on all values described in previous
sections. In order to simplify procedure, Energy Master has predefined recorder
configuration (EN 50160) for it. By default all current parameters (RMS, THD, etc.) are
also included in survey, which can provide additional survey information. Additionally,
during voltage quality survey user can simultaneously record other parameters too,
such as power, energy and current harmonics.
