I have subsation design where three hydro plants are going to tie into the sub of one of hydro plants. Between the generators and the sub, there are a total of 7 breakers and 10 protection relays.
I am trying to simplify the wiring requirements from the relay digital inputs and the breaker...
Hello all,
I am involved in design of 12.5MVA high resistance grounded (using NGT)hydro plant. Having a discussion on CT sizing on the stators low side. On the high side, bolted fault current is 8574A, which is mostly supplied by the utillity. CT's on the high side C800 600:5 rating.
My...
Hello,
I am designing a 10MVA hydro plant. I am using an SEL 387 for current differential. I had designed for shorting test switches between the CT's and the relay but was told that industry standard for the differential relay is not to install shorting test switches but wire the CT through...
I am doing a ground grid study for a small islanded hydro facillity connected to a utillity diesel plant. Using ETAP to model the short circuit ground currents in the hydro plant substation (step and touch potentials).
In setting up the model for the utillity diesels, should the sub-transient...
I am putting together the DC system for a power plant protection system. For the floating DC system, looking for any pro's or con's for fusing both the DC positive and negative inputs of the protection relays or only needing to fuse one side.
Is there any standards with respect to fusing for...
Have a 13.8KV line, 8km long, coming from Hi-Z grounded generator and it terminates into the delta side of a 13.8kv/138kv delta-Ygrounded transformer, 138kV feeding utility. Normally 13.8kV line is Hi Z grounded at generator but should the generator trip, the line will will go to an ungrounded...
Looking for design philosophy with repect to transmission line grounding. We have two distributed generators feeding 7km and 8km of interconnection transmission line to the substation of a third generator site where they will tied and bumped up to 138kv. The output of this 12MVA 13.8kv/138kv...
