Bus/Jumpers – Types Flashcards
The most common type of substation in use today is the air-insulated type.
True
Common names given to bus types are main bus, ring bus, and ? bus.
transfer
One of the common methods to make connections to aluminum tubular bus is with ? .
Tungsten Inert Gas (TIG) welding
Older substations with copper rigid bus systems use welded connections.
False
Minor defects in rigid bus may be repaired by ? .
filing, then polishing with a fine emery cloth
A ? is a flexible bus consisting of a stranded conductor strung between substation structures and may be supported by suspension insulators.
strain bus-bar
Insulated bus-bar is a rigid tubular aluminum conductor installed in a larger metal tube, filled with high pressure ? gas.
sulfur hexafluoride
The type of substation bus that is a rigid bar supported by insulators and covered by a grounded metal shield is the ? bus-bar.
insulated-phase
The most common types of rigid bus-bar used in substations are flat, hollow tube aluminum, and ? .
angle
Where high-current substations are built, ? bus-bars are used because its shape allows heat to dissipate more efficiently.
hollow tube
Strain type bus-bars are used in substations primarily for ? conductors.
high voltage transmission
Hollow tube aluminum bus is the easiest type to connect to with bolt-on jumpers.
false
Because of the lower voltages on the secondary side of a transformer, a ? bus allows for closer spacing and is easier to connect with bolt-on jumpers.
flat or angle aluminum
If the load is heavy enough, two or three large copper conductors may be used per phase as jumpers.
true
Expansion and contraction of rigid bus-bars due to load variation and ambient temperature changes are small amounts and are generally disregarded by designers.
False
