Measurements; Introduction Measurements; Instantaneous Currents; Maximum And Minimum Currents - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

3 - Measurements

Introduction Measurements The Ekip Dip trip unit records various items of information, useful for analysis and consultation:
Instantaneous currents The following table summarises the measurements of the instantaneous currents:
Maximum and minimum
currents
Contact Wear Contact wear indicates the state of deterioration of the main contacts of the circuit-breaker.
Number of operations In the presence of auxiliary power, the trip unit records a series information relating to the openings of the
27 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
• Instantaneous measurements of phase currents
• Measurement of the maximum and minimum currents recorded with an adjustable interval
• Trip Log
• List of events, changes of state and alarms recorded by the trip unit
• Contact Wear value
• Number of mechanical and electrical operations.
NOTE: all the information is available with Ekip T&P and Ekip Bluetooth modules and with
the Ekip Connect software. The instantaneous measurements are also available with the Ekip
Multimeter switchgear unit.
Type of Measurement
Phase currents (I1, I2, I3, INe)
NOTE: the precisions specified in the table refer to the range of normal operation
The trip unit is able to record the maximum and minimum current, measured inside an interval that can be
programmed by the user.
Every measurement recorded is accompanied by the following information:
• Recording interval.
• Phase and value of maximum and minimum current measured.
• Date and time of the recording (referring to the internal clock).
NOTE: in the case of the minimum current, if the value drops below the 0.03 In threshold, it
will be recorded and represented by the symbol "..." in the measurement field.
Trips The trip unit is able to record the last 30 openings of the circuit-breaker caused by protection functions (trips).
The trips include useful information:
• The protection that caused the trip
• The progressive number of the opening
• The date and time of the opening (referring to the internal clock)
• The measurements associated to the trip protection.
The value is expressed as a percentage, and is 0 % in the case of no wear, and 100 % in the case of total
wear.
The contact wear is calculated automatically by the trip unit at every opening for protection or, in the presence
of an auxiliary power supply, also at every manual opening of the circuit-breaker.
circuit-breaker:
• Number of manual operations
• Total number of operations (manual + trips)
Range Standard operation range
0.03...16 In 0.2...1.2 In
Ekip Dip protection trip unit | 3 - Measurements
ABB | SACE Emax 2
Accuracy
1 %