MI 2883 Energy Master
Theory and internal operation
141
A voltage interrupt is characterized by following data:
Interrupt
Start time, Level (U
Int
)
and
Interrupt Duration
:
U
Int
– minimum interrupt magnitude voltage, is the lower
U
Rms(1/2)
value measured
on any channel during the interrupt. It is shown in
Level
column in the Event
Table on the instrument.
The
Interrupt
Start time
of a interrupt is time stamped with the time of the start
of the
U
Rms(1/2)
of the channel that initiated the event. It is shown in
START
column in the Event Table on the instrument . The Interrupt End time of the
interrupt is time stamped with the time of the end of the
U
Rms(1/2)
that ended the
event, as defined by the threshold.
The
Interrupt
Duration
is the time difference between the beginning and the end
of the interrupt. It is shown in
Duration
column in the Event Table on the
instrument.
5.1.13
Alarms
Generally alarm can be seen as an event on arbitrary quantity. Alarms are defined in
alarm table (see section 3.19.3 for alarm table setup). The basic measurement time
interval for: voltage, current, active, nonactive and apparent power, harmonics and
unbalance alarms is a 10/12-cycle time interval.
Each alarm has attributes described in table below. Alarm occurs when 10/12-cycle
measured value on phases defined as
Phase,
cross
Threshold value
according to
defined
Trigger slope,
minimally for
Minimal duration
value.
Table 5.3: Alarm definition parameters
Quantity
Voltage
Current
Frequency
Active, nonactive and apparent power
Harmonics and interharmonics
Unbalance
Flickers
Signalling
Phase
L1, L2, L3, L12, L23, L31, All, Tot, N
Trigger slope
< - Fall , > - Rise
Threshold value
[Number]
Minimal duration
200ms ÷ 10min
Each captured alarm is described by the following parameters:
Table 5.4: Alarm signatures
Date
Date when selected alarm has occurred
Start
Alarm start time - when first value cross threshold.
Phase
Phase on which alarm occurred
Level
Minimal or maximal value in alarm
Duration
Alarm duration
