GE Industrial Solutions ASTAT BP - Manual (Page 37)

ASTAT BP User Manual
37 GE Industrial Solutions ©2013 GE Company All Rights Reserved
WARNING!
Operator’s
responsibility!
1. EXPAND SETTINGS are for use in very special applications only!
Do not set EXPAND SETTINGS to Enable unless ASTAT-BP is significantly larger than the motor!
When using EXPAND SETTINGS for the ASTAT-BP you must be extremely careful to avoid
damaging the motor or ASTAT-BP.
2. Only cancel Phase Loss protection when the operator is sure that no real phase loss exists
and Phase Loss protection is activated. This situation can occur in rare cases when there is no
real fault but the ASTAT-BP recognizes unusual behaviour like when THDV (Total Harmonic
Distortion in Voltage) in the network is high.
If this is a true case of Phase Loss then after cancelling Phase Loss protection the motor will
single phase and most likely be tripped by the over load protection mechanism.
4.7.7 Fault Settings
32
– Page 6
Function &
Default
Range Unit Description
Phase Loss
Enabled
Enabled
33
Sets Phase Loss trip
Phase Loss protection trips the ASTAT-BP when 1 or 2
phases are missing.
Notes:
If ASTAT-BP trips on Phase Loss do the following:
(4) In cases where the current transformers are
connected externally (QBx0210-QBx1100 models),
verify that that the current transformers are not
grounded. Each current transformer is connected
with its 2 wires only and these wires are not
grounded externally.
(5) If previous action does not solve the problem and
the you are sure that no real phase loss exists, you
can set Phase Loss protection to Disable.
This situation can occur in rare cases when there is
no real fault but the ASTAT-BP recognizes unusual
behaviour like when Total Harmonic Distortion in
Voltage (THDV) in the network is high.
(6) If this is a true case of Phase Loss then after
setting Phase Loss protection to Disable the
motor will single phase and most likely be tripped
by the over load protection mechanism.
(7) Phase loss might not be detected in motor
operating under a light load.
WARNING
Do not set Phase Loss to Disable unless it is found
to be necessary in the field!
Phase Sequence
Disabled
Enabled/
Disabled
Sets Phase Sequence trip
When ASTAT-BP is connected in DELTA Conf. you can
not set Phase Sequence protection to Disabled.
32
Displays in MAXIMIZED MODE only. To change to this mode refer to parameter DISPLAY MODE on section 4.7.2 page 26.
33
The range of the PHASE LOSS can be extended to Enabled or Disabled by using the EXPANDED SETTING as described in
section 4.7.6 page 36.