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Entellisys Low Voltage Switchgear
Chapter 9. Maintaining the Switchgear
Lubrication
In general, the circuit breaker requires moderate lubrication.
Bearing points and sliding surfaces should be lubricated at
the regular inspection periods with a thin film of GE
lubricant D6A15A2. Before lubricating, remove any
hardened grease and dirt from latch and bearing surfaces
with mineral spirits then wipe with a clean rag.
CAUTION:
All excess lubricant should be removed with a
clean cloth to avoid accumulation of dirt or dust.
ATTENTION:
Il faut enlever complètement tout excès de
lubrifiant avec un linge propre afin d’éviter l’accumulation
de saletés ou de poussières.
On drawout breakers, the contact surface of the disconnect
fingers should be cleaned and greased with GE lubricant
D6A15A2 as well.
Entellisys Instrumentation and Instrument
Transformers
Check and inspect all devices to see that they are functioning
properly. Check that all electrical connections are tight.
Check mounting of the device.
Breaker Compartment Interiors
WARNING:
De-energize equipment completely before
doing maintenance work in compartments. This includes
de-energizing any connections to outside primary or
secondary sources, such as transformers, tie lines, etc.
ADVERTISSEMENT:
Mettre l’équipement complètement
hors tension avant d’entreprendre tout travail de
maintenance sur tout dispositif, raccordement, barres
omnibus ou les compartiments des câbles d’alimentation.
Cela inclut la mise hors tension des raccordements aux
sources primaires et secondaires tels que les
transformateurs et les interconnexions.
1.
Thoroughly clean the interior of the breaker and
instrument compartments. Use a vacuum cleaner and
clean rags only. Do not use steel wool or oxide papers.
Blowing with compressed air is not recommended.
2.
Check indicating devices, mechanical and key inter-
locks.
3.
Check primary disconnecting device contacts for signs of
abnormal wear or overheating. Discoloration of the
silvered surfaces is not ordinarily harmful. These
contacts should be cleaned only by wiping with a lint-
free cloth.
4.
Clean the racking mechanism and lubricate with GE
lubricant D6A15A1.
5.
Before replacing the breaker, wipe off the primary
disconnecting device contacts. Apply a thin coat of GE
lubricant D6A15A1 to the stationary studs and to the
primary disconnects on the breaker.
9-3 Bus Area
WARNING:
De-energize equipment completely before
doing maintenance work on any devices, connections, bus
work, breaker or feeder cable compartments. This includes
de-energizing any connections to outside primary or
secondary sources, such as transformers, tie lines, etc.
ADVERTISSEMENT:
Désamorcer complètement
l’équipement avant d’effectuer du travail de maintenance
dans les compartiments. Cela inclut le désamorçage de
toute connexion aux sources primaires et secondaires,
telles que les transformateurs et les interconnexions.
Inspect and check the bus area as follows:
1.
Inspect the buses and connections carefully for evidence
of overheating or weakening of the insulating supports.
If bus insulation is present, remove the molded covers
over the main bus connection to expose joints for
inspection.
2.
Check all connection bolts in the bus compartment and
all bracing bolts for tightness. See the Torque Table A-1
in Appendix A.
3.
Vacuum and, with a clean rag, wipe the buses and
supports.
4.
Visually inspect the insulation on the bars that run
from the breaker studs through the bus structure to the
cable area.
5.
After cleaning, megger and record the resistance to
ground and between phases of all insulated bars and all
buses and connections. Disconnect all control circuits
before checking resistance. Do not apply greater than
1500 volts with the megger. Since definite limits cannot
be given for satisfactory insulation resistance values, a
record must be kept of the readings.
Weakening of the insulation from one maintenance period to
the next can be recognized from the recorded readings. The
readings should be taken under similar conditions each time,
if possible, and the record should include the ambient
temperature and humidity.
9-4 Cable and Busway Compartment
Inspect and check the cable and busway compartment as
follows:
1.
Inspect all power cable connections for signs of
overheating and tighten all connections. If severe
discoloration or if damage is apparent, remove the
damaged portion of the cable.
CAUTION:
Be sure the condition that caused the over-
heating has been corrected before energizing.
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