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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...

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

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

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...

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

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

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...

Hello. What the best active harmonic filter supplier? GS

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...

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

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

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

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

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...

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

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...

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

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