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  • Users: STABY
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  1. STABY

    Temperature sensitive outdoor light chain?

    Hello gmensig; For me thats have correct sense, the temperature on which are operating the blinking ligths. As may be you know, those lamp chains are in series connection with a bi-metalic switch that open and close according the temperature self-generated for the current pass in this device...
  2. STABY

    Hello ; We have a three phase soli

    Hello cesarcesar; Thanks for your reply, yes we do exactly the load test for each individual transformer as you suggest, that is applying 220 VAC at the primary and checking for 127 volts output, with a load equivalent to 0.578 times the total load of the stabilizer we are designing, then we...
  3. STABY

    Hello ; We have a three phase soli

    Hello ; We have a three phase solid state voltage stabilizer, tap changer type, assembled with three one-phase transformers. Primary is configured in delta and the secondaries connected in star config.(each of 0.578 of the output voltage) with the neutral not connected. The problem is that the...
  4. STABY

    Backup power supply

    Hi, I think the best solution is change the valve or only the solenoid, some companies offer the chance to change only this part, so you can install a 120 VDC valve and back-up it with 10 small lead-acid batteries in serie and a simple charger to mantain charged this small battery bank. Please...
  5. STABY

    Linear loads on HF Beams

    Hello; Somebody can explain me how works the "linear loads" on HF beams in order to short the phisical length of the elements, similar to the old fashioned "traps" that are concentrated inductances. Jorge - OA4BHY
  6. STABY

    Backup power supply

    Hi, Please tell me what kind of critical equipment you are trying to protect for "brownouts". What kind of wave shape needs: sine wave, square wave, stteped, so we can suggest some solution. Has the equipment a power supply, if yes, try to work on the DC stage. Jorge
  7. STABY

    DC/AC INVERTER W/ IGBT's

    Lewish- I'm going to use one or two 12 v. battery in series connection. Please said me the importance of the DC level for choose beetwen PWM or 4 steps for drive my IGBBT's. as we will use an step-up transformer to obtain 220 VAC, 60 Hz output. peebe- Thanks, I'll like 3% THD as much. Don't you...
  8. STABY

    DC/AC INVERTER W/ IGBT's

    Hi, I'm trying to design a one phase, 2 kVA inverter using a IGBT "H" bridge. There are two wave shapes for drive the bridge; one generated with PWM method, providing pulses of different width and same amplitude, of course according of the angle of the sine reference. The other one can...

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