IB 6.2.11.1-2C
Page 17
ABB
switch settings.
Long-Time Threshold Test
1. Either disable the trip elements not being tested or
set them to their highest threshold value.
2. It is recommended that the Range Selection be set
to its lowest value to minimize the current required for
this test; however, it may be set to either available
value.
3. Set the Long Time threshold. Set the delay to its
minimum value.
4. Test for the actual threshold by increasing test
current until the Self Monitor light begins to blink
quickly. The breaker should trip shortly thereafter, but
the test can be stopped at this point.
5. The threshold tolerance is +10%/-0% on all selector
switch settings.
Long-Time Delay Test
1. Position other trip element selectors at their highest
threshold value.
2. It is recommended that the Range Selection be set
to its lowest value to minimize the current required for
this test; however, it may be set to either available
value.
3. Set the Long Time threshold to its maximum setting.
4. Set test current so that it represents three times (3X)
the trip system Range Selection setting. Delays should
be as shown in Table 4.
Short-Time Delay Test
1. Position other trip element selectors at their highest
threshold value.
2. It is recommended that the Range Selection be set
to its lowest value to minimize the current required for
this test; however, it may be set to either available
value.
3. Set the ST Curve to DEF.
4. Set the ST Pickup to its lowest setting.
5. Set test current so that it represents four times (4X)
the ST Pickup setting. Delays should be as shown in
Table 4.
6. Set the ST Curve to IIT. (Note that the I
2
t function of
the MPSC-2000 Short Time element is operational only
from twice to four times the Range Selection, and that
the trip curve is fixed and does not vary with pickup
settings.)
7. Set test current so that it represents 1.5 times the ST
Pickup setting. Delays should be as shown in Table 4.
Ground Trip Delay Tests
Ground Trip Delay tests are performed by injecting
current through a single phase of the breaker, which
appears to be a ground fault to the trip device. On
breakers with 4-wire ground on double-ended
substations, a remote neutral sensor must be used to
perform this test.
1. Disable the other trip elements or set them at their
highest threshold value.
2. The Range Selector has no influence on ground
settings.
3. Set the GND PICKUP to the minimum available
ground setting, and set the GND CURVE to “IIT”.
4. Set test current so that it represents three times (3X)
the GND PICKUP setting. Delays should be as shown
in Table 4.
LUBRICATION
Only two lubricants are approved for use on the K-Line
Plus circuit breaker. Lubricated during final assembly,
the K-Line Plus circuit breaker should not require
additional lubrication during its service life when applied
in accordance with ANSI C37.13. If, however, the
breaker is applied in unusual situations defined by
ANSI C37.13, has lubrication contaminated with dirt
and debris, or has parts replaced, relubrication should
be performed as specified herein.
When mechanism cleaning and relubrication is
required, do not spray solvents down through the
mechanism to remove old lubricants, dust, and debris.
Do not use dichlorodifluoromethane on any part of the
circuit breaker. These solvents tend to wash debris into
the bearing areas of the breaker, while at the same
time removing any existing lubricant. Breaker
performance will be compromised when these cleaning
techniques are employed.
Proper relubrication requires disassembly, thorough
cleaning by wiping, then reassembly using a brush or
