ABB XT7, Operation And Maintenance Manual

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ABB | SACE Tmax XT
Protections | 8 - Voltage protections 53 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
8 - Voltage protections
List The Voltage protections, available by default for the Ekip Hi-Touch, Ekip G Touch, Ekip G-Hi Touch and Ekip
M Touch models and configurable in the remaining models as additional SW package, are:
Name Type of protection Page
UV Minimum voltage 53
OV Maximum voltage 54
UV2
(1)
Minimum voltage 54
OV2
(1)
Maximum voltage 55
Phase Sequence Phase sequence error 55
VU Voltage unbalance 55
(1)
protections UV2 and OV2 are not available by default with Ekip G Touch. However, they can be integrated by
requesting the relative SW package
UV Protection
U8
t
t8
v
UV
Function
The protection sends a TRIP command if one or more line-to-line voltages detected by the unit drop below
threshold U8 for longer than t8.
To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 88)
• the graph with trip curve (page 99)
Parameters
Parameter Description Default
Enable
Activates/deactivates the protection and its availability in the parameters
menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled, the
alarm and exceedance of protection time are only managed as information
OFF
Threshold U8
Establishes the value that activates the protection.
The value is given as both absolute value (Volts) and relative value (Un) and
can be set within the range: 0.05 Un to 1 Un in 0.001 Un steps
0,9 Un
Time t8
This is the trip time of the protection; the value is given in seconds and can
be set within a range: 0.05 s to 120 s, in 0.01 s steps
5 s
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 78).