ABB | SACE Emax 2
Ekip Touch protection trip unit | 17 - Hi-Touch measurements
115 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
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Each monitoring is associated with control parameters set by the user and updated each time the set control
conditions occur.
NOTE:
•
On the display the cumulative counter and the counter relevant to the last 24 hours of activity
(two counters for each monitoring operation) are available.
•
With external communication, the cumulative counter and the counters relevant to the last
seven days of activity (eight counters for each monitoring) are available.
The general parameters available on the display are:
•
Enable:
to activate the Network Analyzer function and to modify the control parameters
•
I Harm Analysis
: to activate the analysis of the current harmonics.
•
V Harm Analysis
: to activate the analysis of the voltage harmonics.
Voltage sequences
There are three alarm counters:
•
Over voltages
: it records the number of times that the average value of the positive sequence (with the
rotation direction of the phases set: 1-2-3) or negative sequence (with the rotation direction of the phases
set: 3-2-1) calculated in the set interval exceeds a certain threshold.
•
Under voltages
: it records the number of times that the average value of the positive sequence (with the
rotation direction of the phases set: 1-2-3) or negative sequence (with the rotation direction of the phases
set: 3-2-1) calculated in the set interval drops below a threshold.
•
Unbalance
: it counts the number of times that the average value of the ratio between positive on negative
sequence (with the rotation direction 3-2-1) and negative on positive sequence (1-2-3) calculated in the
set interval rises above a certain threshold.
Parameters that can be set for the check are:
Parameter
Description
V Threshold High
It defines the upper alarm threshold for the Overvoltage counter.
It is expressed as % Un.
V Threshold Low
It defines the lower alarm threshold for the Undervoltage counter.
It is expressed as % Un.
Unbalance Th
It defines the alarm threshold for the Unbalance counter, expressed as a % (0
% = symmetric and balanced system).
In the settings menu you can set the
Monitor time
parameter, which defines the time interval between
subsequent measurements.
NOTE:
the monitor time is the same parameter available for the maximum current and voltage
measurements.
The positive and negative sequence counters are available on the display.
The checking is completed by these available measurements:
• Positive sequence relating to the period in progress (V pos seq).
• Negative sequence relating to the period in progress (V neg seq).
• Positive sequence calculated on the last period (Last V pos seq).
• Negative sequence calculated on the last period (Last V neg seq).
• Positive sequence calculated in last the 3 seconds (V pos seq).
• Negative sequence calculated in last the 3 seconds (V neg seq).
• Unbalance.
NOTE:
The measurements of the sequences are available following the path: Main page -
Menus - Measurements - Network Analyzer- V Sequences - V 3s Sequences.
NOTE:
the unbalance value measured by the protection trip unit stops when it reaches 200
%.
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Summary of Contents for SACE Emax E1.2
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