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  1. ozmongoose

    T diamond in SAMA diagram ?

    Thank you all, But it is still unclear to me since the description in the SAMA standard says that this is the symbol of a automatic/manual transfer switch. Could some one explain more in details? What is the difference and what happens when we put a T in rectangle (means automatically executed)...
  2. ozmongoose

    T diamond in SAMA diagram ?

    Hi all, Need your explanation about the T (Transfer) in the diamond in SAMA diagram. What is the physical meaning ? Why is it always placed in between PID controller output and actuator ? Thanks a lot Mongoose
  3. ozmongoose

    How to eliminate harmonics on DC link in 4 quadrad inverter ? Pls HELP

    Hello I don' think the problem is the low DC link capacitance. The power modul has a built-in C in DC link of 235 uF. With two power modul, we have 470 uF. Then I added up a thoudsand uF more. I think it is quite enought. The whole system has the same Earth signal. Power supply is taken from...
  4. ozmongoose

    How to eliminate harmonics on DC link in 4 quadrad inverter ? Pls HELP

    Hi all friends ! I got a problem with my experiment. A DFIM is controlled from rotor side by a bach to back VSC. DC link voltage is at 700V. Capaccitor on DC link: 1470uF, Reactor at AC input of Power Unit : 4.8 mH. The whole control system is programmed by myself with dSpace. Problems: If...
  5. ozmongoose

    How to eliminate harmonics on DC link in 4 quadrad inverter ?

    Hi all friends ! I got a problem with my experiment. A DFIM is controlled from rotor side by a bach to back VSC. DC link voltage is at 700V. Capaccitor on DC link: 1470uF, Reactor at AC input of Power Unit : 4.8 mH. The whole control system is programmed by myself with dSpace. Problems: If...
  6. ozmongoose

    Controlled Rectifier Problems

    Hi Jbartos The Loading procedure is only on the capaccity. We have no load except the C. (of may be, we can add a resistance, parallel with C on DC link)- Ovvercurrent as I found by the STATUS ERROR Signal, reading from the Communication Interface of PU. The checking subroutine works...
  7. ozmongoose

    Controlled Rectifier Problems

    Hi I got a problem with my experiment. The task is how to regulate a stable DC link voltage (620-640V) by controlling a Power Unit PU (Baumueller Bus623) with PWM on IGBTs. Voltage supply 400 VAC, Capaccitor on DC link: 970 microF, inductance at AC input of Power Unit : 3.625 mH (3 phase). Imax...
  8. ozmongoose

    RC Filter or LC ???????

    Hello WE are designing a converter to control a induction machine. The converter uses the IGBTs (8KHz) to create the AC current. We know that a filter at the output of converter is necessary. But I can know if I should take a RC filter or a LC filter. Can anyone tell me how and when we chose one...
  9. ozmongoose

    Help to measure doubly fed induction machine PARAMETERS

    Hi I just explain a litte more about this work. I am working on a DFIM, controlled by an back to back inverter. The control scheme is done by an controller, monitored from a computer. The main task of this work is to investigate the behaviour of system in case of grid fault. Before that, a...
  10. ozmongoose

    Help to measure doubly fed induction machine PARAMETERS

    Can any one show me a solution to measure the AC 3~ Doubly Fed Induction Motor Parameter like Rs,Rr,Ls,Lr... Offline&Online? I supposed that we have the Information of the Motor from the LABEL Ulst=180V ; 7,5KW; delta /star ; 50Hz; cos_phi; 1/min; Rot_A 16,3/9,4 (A)...
  11. ozmongoose

    LEM Voltage Transducers (difficult to use ????)

    I have bought the LEM Voltage Transducers LV 25 -P for my experiment. As recommended in the datasheet, I used the RM as 100 Ohm, RM = 26KOhm to measure the voltage of 250V AC. The supply DC voltage is +/- 15VDC. But the measured voltage at terminal M is always at 15V when V HT is > 0 , and...
  12. ozmongoose

    Motor protection

    Hello That is not a 16 pulse rectifier. Let say, that is a 6 pulse rectifier. Sorry for that !
  13. ozmongoose

    Motor protection ???

    Hi all I got a 3 phase Doubly fed induction motor 7,5KW,230V/400V,50 Hz, rated rotor current 27A. I used 1 converter to control motor, connected to the Rotor side, start connection. In between motor and converter, I would like to use a Crowbar, and a Switch (0-1-2). The crowbar is for motor...
  14. ozmongoose

    Motor protection

    Hi all I got a 3 phase Doubly fed induction motor 7,5KW,230V/400V,50 Hz, rated rotor current 27A. I used 1 converter to control motor, connected to the Rotor side, start connection. In between motor and converter, I would like to use a Crowbar, and a Switch (0-1-2). The crowbar is for motor...
  15. ozmongoose

    AC Motor Parameter Identification

    Thanks electricpete
  16. ozmongoose

    AC Motor Parameter Identification

    Hi Can any one show me a solution to identify the AC 3~ Induction Motor Parameter like Rs,Rr,Ls,Lr... Offline&Online? I supposed that we have the Information of the Motor from the LABEL 380V/660V ; 7,5KW; delta /star ; 50Hz; cos_phi; 1/min; Rot_A 16,3/9,4 (A) 0,82...

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