All feeders (6) are vaccuum, 600 A breakers.Īt all times, 2 lines feed the switchgears, one is reserve. Tie breaker (vaccuum, 600 A) between the 2 switchgears. First 2 lines enter switchgear 1, the other line switchgear 2. For those of you who are curious, here is the station config: Two (2) 25 kV, 1200 A switchgears with 3 incoming lines. How you set these parameters? It's for station bus protection which should be easier than transformer protection I'm calling the SEL guy tomorrow. For the differential element, you have to set a Restrain Threshold and two Restrain Slopes. For detection of out-of-zone faults, the relay has a directional element that may be programmed. The problem that I have is that I know enough to know that I know noting, if you know what I mean. RE: Settings for a busbar differential relay (Electrical). On August 31, 2011, Pusha T announced the signing of a solo deal with Def Jam records and admitted 'G.O.O.D Music/Def Jam is my home.” In 2012, Malice changed his name to No Malice and collaborated with on his mixtape, in the song 'Darkest Hour'.Īnd no, I don't work for SEL. He also appeared on the music video for the song off his 'Lord Have Mercy', which features and is from the 2013 winning. Pusha T released on October 8, 2013, and No Malice released on August 18, 2013. Pusha T and No Malice both released solo albums in 2013. In February 2013 Pusha T said the title of the group's fourth studio album would be As God As My Witness. You might also take a look at SEL Application Guide AG2004-06 on their website. They will usually give you quite a bit of support. They are generally pretty helpful with help on setting the relays. I'd suggest calling the SEL field service engineer for your area. SEL seems to like to keep things fairly complicated - job security for the utility protection engineers, I suppose as well as a lot of flexibility in applications. You have to determine if any of the CTs will saturate for a fault just outside the protected zone. Unclebob, It will be important to determine the accuracy class of each CT used as well as the fault current.

Slava RE: Settings for a busbar differential relay (Electrical) 20 Sep 07 14:15. This will depend on the quality of your CTs and the magnitude of the maximum fault current.' But it's only small part of setting. As DPC saied: 'You can set it as low as practical, generally meaning high enough to avoid nuisance tripping on faults outside the zone. I worked with several types of BBP, each company have some small 'things' and not always you'll found them in manuals. I strongly recommend to you order settings calculation and commissioning of BBP from company with experience in this relay or better, directly from SEL. SEL-487E Transformer Protection Relay can apply up to 5 three-phase restraint inputs, 3 restricted earth fault protection elements, 2 three-phase voltage.

Sel 487e relay manual