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Hi, I am involved in protection scheme design for substation in UK. We have a plain balance scheme similar to a high impedance differential scheme for trafo protection but as a back up so thats why 5P20 CTs and interposing CTs are used. 3 Wdg trafo vector group is Yyn0yn0. It is a common O/C...

Could anyone please educate me (or refer to a book / link) about EHV Mesh Corner arrangement and protection principles? Regards

Hi, Is there any international (European, American or British)standard which describe the method of providing lightning protection for overhead oil and gas pipe lines? I have come across 800 meter long pipelines laid on 17meter height overhead pipe racks (reinforced concrete structure) carrying...

Hello everyone, I have a situation here regarding grounding. There is a new 2x132/11/11kV substation fed by 2x132kV cable circuits. Cable sheaths (95mm2 each) are connected at both ends, length is only 4200m. We also have 2x150mm2 ECCs connected at both ends. Cable sheaths and ECCs are within...

Could anyone please educate me with the difference(s) between class PX and class X CTs? What are the related standards, if different? Regards

Hi everyone, I have been encountered with a situation where my client wants me to put "SEPARATE CHECK CTs FOR EACH BUS SECTION" across the Bus Coupler, balanced by other check CTs in that particular bus section. The the usual bus wires stuff put into operation by isolator aux switches. Its a...

Hi everyone, Could you please discuss the pros n cons and usage of different (most common) vector groups of distribution transformers including 2 wdg and three wdg e.g Dyn, Yyn, Ynynd, Ynynyn etc. Useful links are most welcome. Thanks

Hi all, I want to know that if a check zone-2 is employed in double bus bar scheme for bus-2 (separate check zone for each bus), is it necessary to add CTs around bus coupler?