Hi
We have a Distance Relay From ALSTOM, Type LFZP111. The Line is 132KV and about 300KM Long. There are transformers at various point along the line. We set 80% (70KM) of the first segment as Zone 1 and the entire length of the line as Zone 2. What distance do We set as the length of the line...
We have a 90MVA, 330/132KV, Y/Y transformer that is tripping on REF on the secondary and bucholtz but when re-energised it remain in service. We carried out magnitization, ratio, short circuit and insulation resistance tests which show the transformer to be healthy. What other tests can we...
Hello,
We have an old CT that is of British Standard, of class 0 & T10 on one core and the other core T10. I want to know the equivalent class in IEC standard.
Also another CT is rated 2 x 4/1200, Siemens type of BS standard. What does this signify?
Please, I want to wire an MBCH12 (ALSTOM) differential relay to protect a 132/11KV, 15MVA, Yy0 transformer. It is to replace an old relay.
In the present scheme the primary and secondary CTs are wired in star while interposing CTs on both primary and secondary are wired in star/delta.
The...
Hello
We have a transformer that have bushing CTs at the primary and pole mounted CTs on the secondary. The transformer is an old one with an oil circulating pump (OFAF). When the pump control developed problem the temperature of the transformer started rising. Before the temperature of the...
We have a 90MVA, 330/132/13.8KV Y/Y/D transformer.The transformer was used to replace an old one that got burnt while maintaining the old relays and wiring. It is grounded though an earthing transformer via the tertiary winding. Recently the transformer started tripping on bucholtz.Once the...
