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Thank you all very much. Thats all great info, makes sense to me, I was struggling to work out how to show it. Much appreciated

Thanks Beyond86 - both Transformers are Dy11. I am waiting for the exact voltages between the Transformer secondaries but we do know they won't parallel. We have had this in other parts of the network and I just can't think of a way to prove it graphically why it won't parallel. Thanks...

Hi We have a few situations where 11kV/400v TX's are put up poles that have their ABC terminals connected to BYR phases in that order so won't parallel with the next transformer down the line that has been put up the conventional way of connecting RYB to ABC. (The Tx's have been fitted up poles...

Thanks warwickwrx. I will be contacting doble next week, they are very good at support, I just thought someone may have some insight to the issue. The test plan I found has some odd settings that I don't understand what they relate to. I was in contact with Schneider last week about another...

Hi, We are currently testing a new Transformer Protection scheme and have come up agaianst a brick wall in trying to write a test plan for our Doble 6150 using protection suite 2.2 to get the bias plot. I am unsure of what I have found a template for a different relay type that I hoped to be...

Thankyou both for your responses. Both are great links!! MGTRP - your book was particularly interesting and I believe it should solve my problem - thankyou. Regards Peter[pc2]

Hi Does anyone have a manual for the GEC CDG36 (or CDG31 Relay) that they could link me to? We have several relays that have shown up as not quite following the curves and need some tweaking. I remember having some literature a long time ago of which screw to adjust to alter which setting...

The system here is 11kV 3 phase typically, though this line is run on two phases only. The LV side of all the 11kV/400V transformers are all connected MEN, with driven earths at the base of the pole and at each consumers premises. The 11kV side is Delta connected, with the supply transformer...

Thanks to you both for responding. I am in New Zealand. Waross, I did like your suggestion about turning it into a Single wire earth return line, which I had earlier considered as an option. The only issue with this is the setup we need to do is to be used on maybe alternate days over a month...

Hi all, This is a ittle tricky to describe a possible job coming up. I have been tasked to come up with a design to allow an existing 11kV (1Phase) overhead line to be disconnected from the Network, then using an existing 11kV/230V (50kVA)transformer, connect a generator to the secondary (230V)...

Thanks Ralph. It all seems so simple now!!! Regards Peter

Thanks for the quick reply Ralph. The first part of your explanantion was a very good description of how to show the Dyn11. Can you elaborate on how the second part gives the 60 deg difference. I have drawn it out and think that by having the imaginary neutral on the primary between terminal...

Hi. We occasionally find situations in our network where an overhead 3 phase transformer has been connected to the overhead line with its A terminal to Blue phase, B terminal to Yellow phase and C terminal to Red phase. Normally these connections are A - Red, B - Yellow, C - Blue. This leaves...