ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#150912 - 01/12/06 12:52 AM Octal Relays
RODALCO Offline
Member
Registered: 12/08/05
Posts: 854
Loc: Titirangi, Akld, New Zealand
Why do we have 2 different pin configurations for the plug in octal relays 2 pole double throw c/o contacts and what problems have these caused by plugging in and forgotten to check.

We use them a lot in our 33/11 kV substations for alarms and the like.

here in NZ Email relays have 3 - 6 to the coil.
European relays 2 - 7 to the coil.
_________________________
The product of rotation, excitation and flux produces electricty.
Top
Arc Flash PPE Clothing, LOTO & Insulated Tools
#150913 - 01/12/06 04:15 AM Re: Octal Relays
NJwirenut Offline
Member
Registered: 09/15/01
Posts: 806
Loc: Bergen County, NJ
Strange.

Have never seen an octal relay with anything other than 2+7 for the coil here in the US.

Apparently a holdover from the days of octal vacuum tubes, where 2+7 were (almost always) the heater/filament pins.
Top
#150914 - 02/16/06 05:31 PM Re: Octal Relays
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Posted for RODALCO:

Quote:
Today had something different from the usuall utility jobs.

I had to liven up the mining transformers for the Puhoi tunnel on SH 1 North of Orewa.

do voltage and rotation, polarity checks etc.

Also fit data loggers because of possible voltage dips.

Northern gate way alliance are drilling through one of the hills to ease our northern traffic flow.

11 kV supply to 3 x SDF fuse switches.

750 kVA 11000 -- 240 / 415 Volts
500 kVA 11000 -- 240 / 415 Volts
600 kVA 11000 -- 433 Volts ( 250 P - N )
1000 kVA 11000 -- 1050 Volts for drilling machine

Had to do the SD switching as well as operating all the mining switchgear.

got some piccies if you are interested.

Cheers

Raymond RODALCO


The Email octal relay. We have these in 24Vdc, 110Vdc and ac and 240Vac with these pin configurations:



Substation drawing from substation alarms:

_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 87 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals