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3.2 Disturbance recorder
3 Supporting functions
Technical description
86
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VM55.EN005
Parameter Value
Unit
Description
Note
AddCh
Add one channel.
Maximum simultaneous
number of channels is 12.
Set
U12, U23,
U31
Line-to-line voltage
UL1, UL2,
UL3
Phase-to-neutral voltage
Uo
Zero sequence voltage
f
Frequency
DO
Digital outputs
DI
Digital inputs
U1
Positive sequence voltage
U2
Negative sequence voltage
U2/U1
Relative voltage unbalance
Uphase
Average (UL1 + UL2 +
UL3)/3
Uline
Average (U12 + U23 +
U31)/3
THDUa
Total harmonic distortion
of input Ua
THDUb
Total harmonic distortion
of input Ub
THDUc
Total harmonic distortion
of input Uc
fy
Frequency behind circuit
breaker
fz
Frequency behind 2
nd
circuit breaker
U12y ***
Voltage behind circuit
breaker
AddCh
ULLmin ***
Minimum of line voltages
ULLmax ***
Maximum of line voltages
ULNmin ***
Minimum of phase voltages
ULNmax
***
Maximum of phase voltages
ClrCh
Clear
Remove all channels
Set
(Ch)
List of selected channels
Set = An editable parameter (password needed)
*) This is the fundamental frequency rms value of one cycle updated every
10 ms.
**) This is the fundamental frequency rms value of one cycle updated every
20 ms.