GE Industrial Solutions Entellisys Low Voltage Switchgear - Manuel (Page 49)

Entellisys Low Voltage Switchgear
49
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 interlocks.
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 D6A15A2.
5. Before replacing the breaker, wipe off the primary
disconnecting device contacts. Apply a thin coat of GE
lubricant D6A15A2 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 use over a 1500-volt
megger. Since definite limits cannot be given for satis-
factory 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 which caused the over-
heating has been corrected before energizing.
ATTENTION: Assurez-vous que la condition ayant causé le
surchauffement a été corrigée avant de mettre sous tension.
2. Check all bolts that hold cable terminals to the
connection bars for tightness.
3. Check the neutral bus and ground bus connection and
mounting bolts for tightness.
4. Check that all secondary control wiring connections are
tight and that all control cabling is intact.
9-5 Overall Switchgear
Make the following checks on the complete switchgear
equipment.
1. Clean and inspect all painted surfaces and retouch where
necessary.
2. Check to see that all anchor bolts and other structural
bolts are tight.
3. Check that all breaker and instrument compartment door
latches operate properly.
4. If the switchgear is equipped with heaters, check to see
that all heaters are energized and operating.
5. For exterior vent openings in equipment furnished with air
filters, the foam filter elements should be removed and
washed in warm soapy water, rinsed, and reassembled at
least annually. Elements should be inspected before re-
assembly and replaced if any signs of deterioration are
evident.