In your example the "B1" and "B_stator" are not buses. They are three phase current and voltage metering blocks which are probably re-scaled to save some space.
Hi Slavag,
Sorry it is getting late, the earlier post only shows the faulted bus currents and their RMS, I forget to attach the plots from the winding currents.
http://files.engineering.com/getfile.aspx?folder=9b0ac6e7-2443-4357-a9fa-870238056ea8&file=Zig_Zag_Transformer_Currents_.pdf
Hi Slavag,
The attached file shows the phase (winding) currents and the neutral current when there is a bolted fault on the phase A (24 kV supply).http://files.engineering.com/getfile.aspx?folder=5e2ef44c-86e7-4c28-a832-c84170f25df2&file=Zig_Zag_Transformer_Currents_.pdf
Your model is wrong:
1.) You should use Thyristor bridges instead of IGBT bridges when you using a pulse 12 pulse generator. (GenPulsos1)
2.) Use the ”MedicionR” block is only for AC power.
3.) Use a “mean value” block to smooth the DC Current and voltage before the DC power calculation.
ScottyUK,
The following excerpt from IEC 947-4-1
"5.3.5.5 Starting and stopping characteristics of starters
c) one direction of rotation, or two directions of rotation as in item b), but with the possibility
of infrequent inching (jogging). For this service condition, direct-on-line starters...
jraef
I think it means that the motor is still rotating and the motor terminal voltage is approx 20% of the line voltage due to the trappad flux in the rotor circuit.
Gunnar,
1. Using an insulated oscilloscope or high voltage differential probes check first that that the control (synchronizing) voltage is in phase with the bridge voltage.
2. Check the alpha and beta limit (the rectifier and inverter limit) of the control. The easiest way to do it not...
Asymptote,
The parallel resonance frequency of your system can be estimated by the following formula
n = sqrt(Ssc/Qcap)
Based on the given data I calculated the approximately 144 MVA short circuit power @ the 6.6 kV bus
Therefore in your case n = sqrt(144/0.4) =sqrt(360) = 1439 Hz which is...
Use a PI regulator instead of PID, it will improve your speed control stability, the D part of the controller is not very suitable for speed control application. If you looking for a very accurate and tight speed control your current controller response time has to be 6-8 times faster than a...
The failures happened during start up or the system was running?
If it happened switching do, you have a vacuum breaker or switch and three-phase cable feed from the switchgear to motors?
