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  1. Guilhermebr

    VFD Resonance With AC Grid

    Hello I made some measurement in 3 phase 60Hz 380V, in the input with 3 VFD 500CV same bus. Below waveforms voltage e current at max load, and resonance probability? maybe between capacitor DC Voltage bus x grid AC cables? The is 250 metes low voltage cables, betwenn suplly transformes and...
  2. Guilhermebr

    The best Active Harmonic Filter in The World

    Hello In your experience and opinion, What is the best active harmonic filter in the world? GS
  3. Guilhermebr

    Audio power amplifier for protection relay test

    Hello. Anybody used audio power amplifier for protection relay test? GS
  4. Guilhermebr

    Calc quadrature axis short-circuit transient time constant T'qo

    Hello. how to calc T'qo (quadrature axis short-circuit transient time constant) with: 𝑇′𝑑0 Direct axis open-circuit transient time constant 𝑠 2.460 𝑇′𝑑 Direct axis short-circuit transient timeconstant 𝑠 0.149 𝑇′′𝑑 Direct axis short-circuit subtransient time-constant 𝑠 0.020 𝑇𝑎 Armature...
  5. Guilhermebr

    Transfer, touch and step voltage testing.

    Hello. Anybody could send me, any report about step and touch voltage measuring made in a substation? GS
  6. Guilhermebr

    Step and Touch voltage Tester

    Hello. Anybody help me please about step and touch voltage tester? Metrel, red phase, mitton or another instrument are the best for step and touch voltage measurement In medium and large substation? GS
  7. Guilhermebr

    UPS ARC FLASH

    Hello. Case 1- When UPS receives power from the AC 60Hz line side, and supplies power to the AC 60Hz load side, charge internal battery, and the Bypass Switch off. In this case, for the external short circuit, what is the normal % current contribution? 300% UPS KVA Rating is OK? Case 2 - In...
  8. Guilhermebr

    Active harmonic filter

    Hello. What the best active harmonic filter supplier? GS
  9. Guilhermebr

    Sine Wave Filter with motor cable length 900 meters.

    Hello. The Rockwell recommended use the Sine Wave filter, for a application between drive and motor cable length 900 meters. The cable will not be shielded. Voltage: 460V motor isolation 1000V switching frequency 2khz power: 125cv and 250CV I dont now if will be the best aplication, but...
  10. Guilhermebr

    how sverker 750 change phase angle?

    how sverker 750 change phase angle? GShttps://files.engineering.com/getfile.aspx?folder=77c4a09e-c9c5-4f1f-802c-c93803746483&file=images.jpeg
  11. Guilhermebr

    How to make a secondary current tester 80A low price

    I need to do some testing on a protection relay of up to 80A. Does anyone have a simple things diagram for me to assemble? GS
  12. Guilhermebr

    Rated opening time breaker

    Hello. I did some opening time tests on old allis chalmers oil breakers at 138kv. Opening times are longer than 700ms. Does anyone have experience with testing on these circuit breakers? and some opening-time reference for me to use? GS
  13. Guilhermebr

    Measurements step and touch voltage with aemc 6472

    Hi. Anyone used the aemc 6472 ground test equipment for touch and step voltage measurement in medium-sized substations? It has only 250mA current, and my concern and does not sensitize the step and touch voltage in the earth. GS GS
  14. Guilhermebr

    High frequency voltage common mode

    Hi. The picture was measurement Phase to Earth in 3 winding 400V-231V in the transformer with 3 winding in same core. 1 Winding in High voltage 12kv, 2 winding in 690v for inverter back to back. The high frequency in sine wave measurmet can have relations with common mode from inverter back...
  15. Guilhermebr

    Measurement in cable of 15kv with flexible current sensor.

    Anyone did current measurement with flex sensor in 15 kv cables? I am problems in measurement. I opened the shield in the cable disconnect to the ground, but de current have oscilation. I am use the dranetz px5 with 3 dranflex. GS
  16. Guilhermebr

    High frequency with inverter back to back for dfig Wind generator

    Hi. The picture in attached was measurement from dranetz px5 in transformer with 3 winding.1 Winding in High voltage, 2 winding in 690v for inverter back to back and the 3 winding in 400 v for other loads where I did measurement. The high frequency in sine wave measurmet can have relations...
  17. Guilhermebr

    Sine Wave Filter output VFD

    Hi. Does anyone use the Mirus or MTE sine waves filter LCL at the output of vfds? Is the voltage waveform really sinusoidal? Guilherme S. BRAZIL
  18. Guilhermebr

    Mirus Harmonic Filter

    Good Morning. I would like to know, about harmonic voltage measurement on the output of the harmonic mirus filter?

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