Equipment Damage Curves
Equipment Damage Curves
(OP)
Trying to find some reference material on 15 kv switchgear damage curves. I am trying to convince a client to install a partial bus diferential protection and want to quantify the possible damage to the equipment without it.






RE: Equipment Damage Curves
RE: Equipment Damage Curves
See IEEE Std C37.97-1979 (R1990) Guide for Protective Relay Applications to Power System Buses. Description at standards.ieee.org/reading/ieee/std_public/description/relaying/C37.97-1979_desc.html Often, bus-protection schemes have evolved from hard-won experience, and will not show up requested by a client unless outage(s) have caused significant loss in production and restoration-expense outlay.
RE: Equipment Damage Curves
http://www.usace.army.mil/publications/armytm/tm5-811-1...
for damage curves
RE: Equipment Damage Curves
RE: Equipment Damage Curves
RE: Equipment Damage Curves
Bus differential protection is advisable for applications where personnel may be injured by sustained faults, where downtime for repair is costly, where fault levels are high or where upstream overcurrent protection is suspect.
RE: Equipment Damage Curves
Visit
http://www.geindustrial.com/pm/notes/artsci/?SMSESSION=...
for The Art and Science of Protective Relaying by C. Russell Mason
RE: Equipment Damage Curves
It is different to bus zone differential which operates instantaneously for a fault on the busbar and requires CTs on all breakers.
Partial differential only requires CTs on the Incomers and Bus section breakers, and will operate for faults on the feeders so a time delayed grading is required.
It is very common for these terms to be confused (some on this thread have also thought inst bus zone diff !)- perhaps your client has also misinterpretted your proposal.
However fast operation to limit damage is not normally the reason for applying this scheme, rather providing good selectivity is it's benefit.
RE: Equipment Damage Curves
Could you please give me the web access to all the mil chapters on the protection. Have been quite useful.
Ta