Recent content by elmatador82

VTer: Yes you are correct. I just checked with cooper and our transformer is a 5-legged core design! Which is good news.

Bronzeado: We have wired the high high winding temperature back to our control system. We shut down all motor loads upon detecting this. Would this buy anytime on saving the transformer? I don't know the internal design of the transformer core. Is there something we could implement to prevent...

VTer: Our transformer is 200 meters from the Utility Pole. The Utility Pole will have a gang operated switch with fused protection for the conductors leaving the pole. The pole is actually a 4-wire service. They have a neutral wire running on their high voltage line. The utility will land the...

davidbeach - Thanks. I looked at the diagram and it makes sense. The amount of current circulating back to the primary will therefore be very small taking into account the turns ratio, 0.12Amps in this case. VTer - I managed to convince the utility engineer to run 4-wires out to our primary...

Thank you for your response Bill. Your point does make sense. Would the following method work better to prevent neutral currents from flowing back to the H0? - Bring 4-wires (A, B, C & N) from the high voltage line (system) and terminate them straight to the H0, H1, H2, H3 bushings on the...

Thank you Mbrooke for your response. I double checked with our transformer vendor as well as our schematics and the XO and HO bushings are completely isolated from one another. The X0 bushing is brought out via a fully insulated bushing in the low voltage compartment. The XO will be ungrounded...

Thank you for the response guys. We've already purchased the Y-Y transformer. We are in a bit of a bind here. I am still waiting to hear back from the utility. Would it still be acceptable if we bring 4-wires (A,B,C, and N) to the primary side of the transformer and solidly ground the H0...

The XO and HO bushings are available on the transformer and not internally connected.

Hi Guys, I am new to the forum. I a WYE-WYE padmount three phase transformer 25kV/600V. The utility company requested our engineering firm to buy Y-Y style transformer. The high voltage utility line is a 4-wire service with the neutral grounded. The utility is only going to run three wires, i.e...