Electromagnetic induction how to deal with it?

Question

Electronics

The signal to the 3D TV comes with a 15-meter HDMI cable, several 3-phase devices work nearby.
When these devices are turned on or off, the 3D TV signal is lost and the 3D settings are lost.
Electric motors are 3-phase, the winding of contactors is 24V - I connected diodes in parallel with the winding - it does not help! I also connected capacitors from 0.1mF to 1mF. partially helps - i.e. interferes once in a while.
- almost all cables have ferrite tips (filters) installed!
- where to look for a rake???
Thank you !

Answer 1

Two electric motors (opening the doors) gave the main interference (probably due to the fact that there are gearboxes that give an additional load when starting the engine, as well as brake pads (to fix the door in the desired position) - probably when starting and braking they gave an additional load on the electric motor, the rest of the interference was extinguished by RC circuits and varistors in parallel with the starter winding! thanks to all the participants for your help!

Answer 2

There is a suspicion that the problem is not in the EM field around the conductors, but in the generation of noise during start / stop entering the mains. The simplest solution is to connect sensitive equipment through a pilot with a decent filter or even a stabilizer. You can also try UPS.

Answer 3

Lay the HDMI cable as close as possible to the TV's power cable and connect it to the same source from which the signal source for the TV is powered. You most likely have equalizing currents flowing through the braid and this makes the TV go crazy.

Answer 4

1. Try to lay the cable in a metal corrugation, and already ground it.
2. Connect the TV through a double conversion UPS with a pure sine output.
3. Connect the computer through a double conversion UPS.

Answer 5

Need more shielding!

Answer 6

Have you tried grounding? may I help

Answer 7

I have such a stray, hd wireless
transmits hdmi signal wirelessly
, I have a model from brite view
, in fact, a receiver and transmitter with hdmi inputs and in the middle they connect wirelessly, maybe this is your way
for the price I won’t tell you, I took it for a long time
about noise immunity either I'll tell you I don't have a shop

Answer 8

Try grounding the sheath of the hdmi cable. There is another option that interference occurs in the equipment if there are no screens. You can also lay the cable away from interference generators.
By the way, ferrite filters help only from high-frequency interference.

Answer 9

Sorry ... I didn’t notice that you have already done it :)
I think it will help you to connect 3 varistors, parallel to 3 windings of the ED (capacitors can also and should be left, but their capacity can be increased even more, you can also put ceramics in parallel with film capacitors for 1000 peak).
I recommend choosing varistors for 620 volts. It is with this voltage that they will limit the peak release of the self-induction EMF. It is desirable to have a diameter of at least 15 mm (this is their power dissipation of surge surge energy will determine).
Moreover, it is best to arrange all this in the ED terminal box.
If you want to fight even more effectively, then you can add a resistance of 20 ... 47 Ohms in series with the capacitor. I can’t say for sure the power, but perhaps resistors will be required for 2 watts.