Hi all:
Would appreciate some comments.
Tested a CT which does work when performing primary injection at 100 amps with some errors, so it does perform transformation. However I cannot obtain a typical X1-X5 saturation curve, and ratio testing is off of nameplate values. These are C200 rating...
Motor Data: 3500 HP SCIM, 95% efficiency, 4160V, Xd" = .18 or 1.133 ohm on 6.29 ohm base. Full voltage start cct.
CT Data: I have three zero seq CTs at the motor in standard differential config; T1-T4, T2-T5, T3-T6. It is a C50, ratio 100:5A.
My CT loop resistance measured at 2.3 ohms and CT...
I helped performed testing on a small rectangular sub where the diagonal grid length was measured at 17 metres. The current probe was installed at 9x the diagonal dimension from one of the grid electrodes.
Voltage measurements were done at .05, .1, .2, .3, .4, .44, .48, .52, .56, .58, .60...
I just tested a 16 MVA unit that was subjected by 2 - 100 MVA 3-phase bolted fault on a down stream bus. One occured last week and the other occured last May.
Ratio and resitance data is normal.
Capacitance bridge data showa a 16% increase for SEC - GND capacitance an 8% increase in SEC -...
I am writing a MV substation commissioning course.
Can anyone direct me to the most complete place to look for definitions for the power disconnects (switch). ?
I would like to see the various types defined as in, isolating disconnects, load break, load make, fused, magnetizing load make /...
Does anyone have a procedure for testing the restraint differential elements using single phase test source while on the Y-D configuration ?
Relay manual suggest using identical winding cofiguration which in effect defeats the matrix phase adjustments between windings.
Thanks for any suggestion.
