480V Switchgear & MCC deficiencies found during inspections
-
Upload
imteyaz-ahmad -
Category
Documents
-
view
304 -
download
0
Transcript of 480V Switchgear & MCC deficiencies found during inspections
480V Switchgear & MCC deficiencies found during inspections
• Loose PT connections• Loose CT connection• Dirty • Panels and covers not affixed properly (bolts without nuts held in with tape• Ground ball covers missing• Stainless wire for tag securement and other foreign material left in sections (hard hats, gloves tools, metal bars, etc.)• Deformed/damaged structure • Modified structure• Missing components• Non Manufacturer hard ware• Damaged cables• Damaged breaker and breaker cubicle components• Conduit entry into arc flash doors• Wiring ferruls too small for the wire and strands that did not fit were “trimmed” off.• Bus boots and covers not secured or covering bus bolts or splices• Equipment numbers missing or on wrong devices• Ferrous Gland Plate on MCC incoming sections.• Incorrect cables on all Battery systems, flexible cable is required by spec• LCS tags need to follow specific EMETL methods and include equipment tag number (not LCS P&ID number), Description,
and Source (MCC and cubicle), if more than one substation in facility then building number shall be included as well. S7C-0702-06, 07, &08
• SEOLDs not created• MCC cubicles not identified with cubicle numbers. • Missing communication cable between SEL relays on MTM
Loose 480V SWR PT Connections
Loose 480V SWR PT & CT Connections
Bolts without nuts on panels & covers
Before cleaning
Cleanliness/PT/CT connections & Ground ball covers
Deformed/damaged structural members
Structural Modifications (this bracket was moved form its original position)
Missing Components (a barrier between sections is missing in this photo)
Non manufacturer hardware
Inspect power cables for damage and tightness
Damaged hardware in breaker cubicles (this shutter mechanism is bent in a “U”
Damage to Structure
Conduit in arc flash blast openings
Conduit hole repair
Lug feral to small for wire (you can see where wire strands were given a “haircut”
Foreign objects found in gear (here is wire that held on information tags left on a ground ball that will be energized). Hard hats, gloves, metal rods, info
tags, tools etc. were found in the gear during our inspections.
Info tag left in gear
Another example of CT layout also be sure that the bus boots & covers are all in place and secured.
Equipment tagging – not there or wrong (below the Bus PTs are labeled Line PT and the Line PT is labeled Bus PT)
Gland plates made from ferrous material
Incorrect battery cable, flexible cable required to eliminate stress on connections