from the Automation List department...
generator lock-out relay
Engineering and workplace issues. topic
Posted by Anonymous on 8 May, 2006 - 11:31 am
what is the function of generator lockout relays 86G-1 and 86G-2 that are used in GE generators protection system?

Posted by markvguy on 9 May, 2006 - 9:32 pm
Well, the description of an 86 device is a "locking-out" or "lock-out" relay. In general, the 86G-1 and 86G-2 relays on the Generator Protection Panel are actuated by one of several generator protection relays--usually, 87 devices (differential current detection devices--and occasionally, others as specified by the owner, insuring agency/company, local regulations, or utility requirements.

Sometimes, numerous devices were "grouped" to actuate 86G-1 OR 86G-2 in order to provide some differentiation as to the exact cause of the trip.

When an 86G-n relay is actuated by one or more generator protective relays/devices, the device/relay which actuated the lock-out should have a "flag" or illuminated indicating light to signify which device/relay detected a serious problem which could cause damage to the generator. When the actuating device is identified, the cause should be investigated and understood BEFORE the unit is re-started.

When an 86G-n device is actuated, the generator breaker is opened (tripped), excitation is usually de-energized, and the turbine is usually tripped (emergency shutdown).

The 86G-n relays require a manual reset (they must be manually rotated to return to the reset position) in order to permit a turbine re-start--hence the "lock-out" function.

Refer to the Generator Protection Panel elementary drawings for the exact details of what devices actuate the 86G-n relays at your site.


Posted by Anonymous on 9 May, 2006 - 9:45 pm
This link shoud explain what these lockout relays are used for in a GTG. macion/central_termica_amorebieta/es_9062/adjuntos/PE-B.pdf

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2014 Nerds in Control, LLC. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, MySQL and Apache. Be happy.

Don't believe everything you hear or anything you say.
Advertise here
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive