Name Type Values (Range) Unit Description
Time min dmd S Timestamp Time of minimum
demand
Time max dmd P Timestamp Time of maximum
demand
Time min dmd P Timestamp Time of minimum
demand
Time max dmd Q Timestamp Time of maximum
demand
Time min dmd Q Timestamp Time of minimum
demand
8.1.11.6 Technical data
Table 573: PEMMXU/MPEMMXU Technical data
Characteristic Value
Operation accuracy At all three currents in range 0.10…1.20 x I
n
At all three voltages in range 0.50…1.15 x U
n
At the frequency f
n
±1 Hz
Active power and energy in range |PF| > 0.71
Reactive power and energy in range |PF| < 0.71
±1.5% for power (S, P and Q)
±0.015 for power factor
±1.5% for energy
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
8.2 Disturbance recorder
8.2.1 Functionality
The IED is provided with a disturbance recorder featuring up to 12 analog and 64
binary signal channels. The analog channels can be set to record either the
waveform or the trend of the currents and voltage measured.
The analog channels can be set to trigger the recording function when the measured
value falls below or exceeds the set values. The binary signal channels can be set to
start a recording on the rising or the falling edge of the binary signal or both.
By default, the binary channels are set to record external or internal IED signals,
for example the start or trip signals of the IED stages, or external blocking or
control signals. Binary IED signals such as a protection start or trip signal, or an
external IED control signal over a binary input can be set to trigger the recording.
The recorded information is stored in a non-volatile memory and can be uploaded
for subsequent fault analysis.
1YHT530004D05 D Section 8
Measurement functions
615 series 649
Technical Manual
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