Hi,
I have had experience in testing busbar protection via secondary injection methods. This is easier because no live circuitry involved, no HV switching required.
Can anyone give me tips on how to carry out site-commissioning, especially with regard to adding new bays to bus protection to...
Hi,
We've had a few trips on our transformer differential relay that feeds an aluminum smelter. The differential relay is microprocessor-based, low impedance type.
Are there anyone who has seen any funnies with this load? What from the load side could affect the protection adversely?
The...
Hello,
We have two 15MVA star-star transformers terminating on two 11kV busbars with a bus-tie. Full load current for the transformers are 787Amps. Assuming the load is spread evenly between the two buses, how would the bus-tie CB and bus-equipment be rated?
Thanks.
Good day,
I'm in an IEC world.
I have a 11kV/0.4kV, 200kVA xfr. This means 10.5A high side nominal current, and 282A low side nominal current.
How do I size the 11kV CT for overcurrent protection? The fault levels on 11kV is 25kA.
b.
Hi,
Could anyone point me to documentation (preferably free to download?) that would assist me in specifying a circuit breaker on 11kV to 132kV networks? Your help is appreciated.
B.
Hi,
Need help. We have a 100MVA shunt reactor connected to 400kV bus. Additionally, this shunt reactor has a star connected tertiary that is loaded in emergency conditions.
It's differential protection is misbehaving. Diff protection trips the breaker whenever the breaker is switched (ie...
Hi,
I would like to have access to books/documents or url's regarding substation design from environmental impact assessment, sub location, construction, equipment rating, substation layout, cables layout, water ducts, and other factors that might affect design.
Your comments would be appreciated.
