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 Marke. My initial question, was about the best supplier active harmonic filter in the world in your opinion and experience. I used passive harmonic filter with diesel generator (off grid) suppling vdf 300kw 6 pulses, and worked very well. I had problmes too with HF and Active harmonic...
Hello Davidbeach
Old audio amplifiers were called voltage amplifiers, and they use a transformer to reduce the voltage and increase the current.
Mosfet amplifiers, also called current amplifiers, have no transformer, so a short on the output goes straight to the mosfet.
I believe that...
Hello.
Normaly for simplie relay 27, 59, 50F, 50N, 51F and 51N protections functions, I use old mono phase source (without amplifier).
When I have complex relay with many protection functions, I rent omicron or similar relay tester.
I Will try audio amplifier becouse is cheppear and its have...
Maybe I have to change the amplifier's internal output transformer, to the current input of the relay, which is almost a short circuit.
The output of the audio amplifier is 2 ohms 250W, and relay current input is <0.02 ohms.
GS
