Table. 5.3.2.2 - 56. Internal inrush harmonic blocking settings.
Name
Range
Step
Default
Description
Inrush harmonic blocking (internal-
only trip)
0: No
1: Yes
-
0: No
Enables and disables the 2
nd
harmonic
blocking.
2
nd
harmonic blocking limit (Iharm/
Ifund)
0.10…50.00%I
fund
0.01%I
fund
20.00%I
fund
Defines the limit for the 2
nd
harmonic
blocking.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal will be generated
and the function does not process the situation further. If the START function has been activated before
the blocking signal, it resets and the release time characteristics are processed similarly to when the
pick-up signal is reset.
The blocking of the function causes an HMI display event and a time stamped blocking event with
information of the startup current values and its fault type to be issued.
The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
Events and registers
The capacitor bank current unbalance protection function (abbreviated "UCP" in event block names)
generates events and registers from the status changes in ALARM START, ALARM, START, TRIP,
BLOCKED and HARMONIC BLOCK. The user can select which event messages are stored in the main
event buffer: ON, OFF, or both. The function offers one (1) independent stage.
The events triggered by the function are recorded with a time stamp and with process data values.
Table. 5.3.2.2 - 57. Event codes.
Event number
Event channel
Event block name
Event code
Description
10112
158
UCP1
0
Alarm Start ON
10113
158
UCP1
1
Alarm Start OFF
10114
158
UCP1
2
Alarm ON
10115
158
UCP1
3
Alarm OFF
10116
158
UCP1
4
Start ON
10117
158
UCP1
5
Start OFF
10118
158
UCP1
6
Trip ON
10119
158
UCP1
7
Trip OFF
10120
158
UCP1
8
Block ON
10121
158
UCP1
9
Block OFF
10122
158
UCP1
10
Harmonic block ON
10123
158
UCP1
11
Harmonic block OFF
The function registers its operation into the last twelve (12) time-stamped registers. The register of the
function records the ON event process data for START, TRIP or BLOCKED. The table below
presents the structure of the function's register content.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
105