Dielectric Withstand Tests On Power And Control Circuits; Lubrication - ABB K-Line Plus KP-8 Installation & Maintenance Instructions Manual

IB 6.2.11.1-1C
Page 21
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 follows:
6. Set the ST Curve to IIT. (Note that the I
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
Figure 12.
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
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 Figure 12.
DIELECTRIC WITHSTAND TESTS ON POWER
AND CONTROL CIRCUITS
Dielectric withstand tests on circuit breakers are made
to determine the ability of the insulation to withstand
overvoltages.
A 60 Hz alternating sinusoidal voltage (RMS) value
equal to the specified voltage shall be used.
voltages used in the dielectric withstand tests shall be
measured in accordance with ANSI Measurement of
Voltage in Dielectric Tests, C68.1.
Duration of Test - The dielectric test voltage shall be
applied for a period of 60 seconds.
2
t function of
ground on double-ended
Condition Of Circuit Breaker To Be Tested - Dielectric
tests shall be made on a completely assembled circuit
breaker and not on individual parts.
Temperature At Which Tests Are To Be Made -
Dielectric tests shall be made at any temperature
between 10°C and 55°C.
Magnitudes And Points of Application Of Test Voltage -
The dielectric test shall be applied as follows:
1. With circuit breaker in the open position, apply 1,320
volts:
a. Between live parts, including both line and load
terminals, and metal parts that are normally
grounded; and
b. Between line terminals and load terminals.
2. With circuit breaker in the closed position, apply
1,320 volts:
a. Between live parts and metal parts that are
normally grounded; and
b. Between terminals of different phases.
3. With circuit breaker in either open or closed position,
apply 900 volts (Note: Pull plug on solid state trip unit,
as a precaution) between all secondary disconnect pins
(except for the motor pins - A1 and A7) and metal parts
that are normally grounded.
4. Apply 600V between the motor leads and metal parts
that are normally grounded (Note: if secondary
disconnect pins A1 and A7 are used for this test,
ensure that the motor disconnect switch is ON). Motors
that have been in service may fail dielectric due to a
normal accumulation of debris from the commutator.
Cleaning the motor will restore dielectric integrity.
Do not perform dielectric testing on the MPSC-2000
solid state trip system. If such tests are performed,
internal surge protection will falsely indicate dielectric
failure on the MPSC-2000 solid state box.
Note: All circuit breakers are dielectrically tested
before leaving the factory.
represent 60% of the originally tested values for testing
circuit breakers that have been in service (ref. ANSI
C37.50).
All

LUBRICATION

Only three lubricants are approved for use in 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.
ABB
The above voltages
If, however, the