MI 2892 Power Master
Theory and internal operation
168
Figure 5.14:Voltage interrupts related screens on the instrument
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.
5.1.14
Alarms
Generally alarm can be seen as an event on arbitrary quantity. Alarms are defined in alarm table (see
section 3.21.3 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 5.5: 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:
