ABB XT7, Руководство по эксплуатации и обслуживанию

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ABB | SACE Tmax XT
Protections | 11 - Power protections 65 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Continued from the previous page
Parameter Description Default
StartUp enable
Activates/deactivates the function and availability of the associated
parameters on the display
OFF
StartUp
Threshold Fw
(2)
Protection threshold valid during Startup time, in the conditions in which the
function is activated and with forward current direction
(2)
.
The value is given as both absolute value (Amperes) and relative value (In)
and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
4 In
StartUp
Threshold Bw
(2)
Protection threshold valid during Startup time, in the conditions in which the
function is activated and with backward current direction.
The value is given as both absolute value (Amperes) and relative value (In)
and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
4 In
StartUp Time
(2)
This is the time for which the StartUp threshold remains activated and is
calculated from the moment the activation Threshold is exceeded
The value is given in seconds and can be set within the range: 0.1 s to 30 s,
in 0.01 s steps
0.1 s
Direction Min
Angle
Ekip Touch calculates the phase displacement angle between active and
apparent power measured: when phase displacement exceeds the set
Direction Min Angle parameter, the unit considers the fault direction to have
been identified. The value is given in degrees and can be set within a range
of 15 values from 3.6° to 69.6°
3,6 °
(1)
details on page 76
(2)
details on page 78
Limitations and additional functions
the functions blocking the type of selectivity and the Trip only Forward and Trip Only Backward parameters
can also be accessed by means of the service connector (via Ekip Connect) or communication via system
bus (page 78).
Notes
• activation of D directional protection automatically activates the alarm that monitors phase sequence (which
can also be excluded and activated in the manual mode): note how, in the case of a cyclic sequence of
phases that differs from the set value, in the event of a fault the directional protection inverts the reference
direction with respect to the expected direction; details of the phase sequence protection are available
on page 55
• in the case of small overcurrents, the behavior of the directional protection is influenced by the type of
load: to prevent the direction of the fault current from being incorrectly interpreted in the case of capacitive
loads, it is advisable for the setting of that protection to be made on the basis of real fault conditions and
not overloads