Siemens RL Series, Инструкция по эксплуатации

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Maintenance
Recommended RL (LM Version) Breaker Main tenance and
Lubrication Procedure
A suggested procedure to follow during maintenance and
l ubrication sessions:
1 . De-energize the primary and control circuits.
2. With the cubicle door closed, rack the circuit breaker to
the DISCONNECT position .
3. Open the cubicle door, and remove the circuit breaker
from the cubicle.
4. Rotate the racking screw to the TEST position
(approximately 3 turns) to clear the spring discharge interlock.
This is necessary before the closing springs can be charged,
and also makes removal of the arc chutes easier.
5.
Remove arc chutes and examine arc chutes and circuit
breaker contacts for burned, cracked, or broken parts.
To remove arc chutes, proceed as follows:
a. Remove retaining nuts that hold the support bar. remove
the support bar and phase barriers.
b. Lift arc chutes vertically to clear arc runners.
6. Inspect arc chutes. replace if arc plates are excessively
burned.
7. Wipe the contacts with a clean lint-free cloth a
�
d a non­
corrosive contact cleaner solvent, denatured or tsopropyl
alcohol.
8. Replace badly burned or pitted contacts. (See 'Contact
Replacement', Page 1 7, and 'Lubrication Chart', Table 5). Do
not lubricate faces of contacts.
9. Clean any accumulation of dust or dirt from the circuit
breaker. For insulating parts, use a clean lint-free cloth. a
non-toxic cleaner, such as denatured or isopropyl alcohol may
be used.
1 0. Bearing pins and other sliding or rotating surfaces
should be cleaned and then coated with a light film of grease.
(See 'Lubrication Chart', Table
5. Page 1 6)
1 1 . Perform a maintenance closing operation (see Page 1 4
a n d Table
4 )
to check latch a n d linkage movement. (Be sure
to rotate the racking screw to the TEST position to clear the
spring discharge interlock before attempting to charge closing
springs).
1 2. Check circuit breaker adjustments. (See 'Adjustments',
Page 14)
13
1 3.
Exerc1se
the circuit breaker through several close-open
cycles. For electrically operated circuit breakers, operate the
circuit breaker electrically. (Refer to the specific wiring
information for your circuit breaker to determine where control
voltage signals should be applied. Usually, spring charging
power is connected between secondary disconnects S D 1 2
a n d S D 1 6 , closing control power between SD1 3 a n d SD16,
and tripping power between S D 1 1 and S D 1 6. Secondary
disconnects are arranged with S D 1 on top, and S D 1 6 on the
bottom) Examine the operation of the circuit breaker during
these operations for any evidence of difficulty, erratic
operation. etc.
1 4.
Reinstall arc chutes. Close and open the circuit breaker
to ensure that the arc chutes do not interfere with circuit
breaker operation.
15.
Test the tripping system, using an appropriate test set,
primary current or secondary injection, such as the Siemens
Portable Static Trip Set, model PTS4. Refer to 'Static Trip Ill
Information and Instruction Guide', SG-3 1 1 8, and 'Portable
Test Set Instructions', SG3 1 38, for information on testing. The
test should include tripping of the circuit breaker by the trip
device. This confirms the functionality of the system, including
the trip device and the tripping components.
1 6 . An optional megger test may be run on the main contact
circuit
(500-1 000VDC, ( 1 00 Megohms Min )), to be sure that
all
connections
are free of u ndesired grounds. A megger test
also may
be
r
un on the control circuit including the spring
c h a rging
motor (250-500VDC, (25 Megohms Min.)). both
limits are at
20 degrees C.
1 7 .
A d ielectric test, if possible, may be run on the main
contact (power) circuit for one minute at the appropriate test
voltaqe (Voltage transformers, control power transformers,
surg
�
arresters, and surge capacitors must be disconnected
during this test.)
Note: Do not perform dielectric tests on the Static Trip Ill
tripping
system.
Refer to 'Static Trip I l l Information and
Instruction Guide', SG-3 1 1 8.
Rated voltage of
circuit
Test voltage
480
or 600 volts 75%
of
2200 - 1 650 VAC
208
or 240 volts 7 5% of 1 500
=
1 1 25 VAC
Secondary
& control
c
i
r
cu
i
ts
75% of 1 500
=
1 1 25 VAC
Note : Certain control devices, such as motors and motor
c
i
r
c
u
it
s
, should be tested at 675
VAG.
E lectronic devices
should be tested at the voltages specified in the instruction
manual for the electronic device.
For routine testing
it
is considered to be acceptable to limit
the test voltage to 675
VAG
on all the attached control
circuits when a motor is involved. To avoid having to
disconnect the motor leads.
Dielectric tests a re also recommended when new units are
added
to a n existing installation, or after major field
modifications. The equipment should be put in good condition
prior to the field test. It is not to be expected that equipment
shall be subjected to these tests after it has been stored for
long periods of time or has accumulated a large amount of
dust, moisture, or other contaminants without being first
restored to good condition.
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