With reference to thread238-185719, I was also struggling in finding the relay manual for the legacy relay.
Finally, I got one with help of one of my colleagues.
Cheers!http://files.engineering.com/getfile.aspx?folder=23217215-2896-48a3-8091-05ceda048e76&file=CTZ_R5902P.pdf
The bus-coupler also has LSIG release.
Need your advise on ground fault protection on LV incomer and bus-coupler.
Currently these have been disabled. The outgoing feeders of LV board do not have earth fault protection device.
The largest outgoing feeder is 630A Air circuit Breaker.
Does the approach mentioned in my previous post on this thread good to provide adequate discrimination without use of directional overcurrent relay?
The incomers for LV panels have same LSI settings. When bus-coupler operates in event of fault on bus-bar then the sequence of operation shows...
Guys thanks for the advise.
This is a protection coordination study I am working on with review of protection schemes. The electrical infrastructure is too old (1959). The coordination of relays and releases in out of sorts.
I was planning to have the coordination in such a manner that if...
Hi,
I have come across a very peculiar case during study of a power distribution system at one of manufacturing sites:
The power distribution system consists of 3 Panel 11kV VCB Switchboard (1 Incomer+ 2 Outgoings)equipped with Siemens 7SJ6015 relays. Each of outgoings feed 2- 11/0.433kV 1 MVA...
Hi,
Please help me out on the topic of reaccelaration logic for medium voltage motors in bus-transfer scheme. I have tried reading a few papers on this, but everything's put up in tedious mathematical equations. Sending a relevant website link would be an additional help.
Regards,
durgeav
Thanks everyone for the replies...
If I want to size the contactors for a 10 kW, 415V,50 Hz 3-phase squirrel cage motor, according to Waross I'll be sizing the delta and main contactors @ 58% of the motor rating. This means the delta and main contactors shall be rated for...
