General > General Technical Chat
Isolation transformer - Voltage between output and ground
S. Petrukhin:
--- Quote from: m k on February 11, 2024, 04:34:03 pm ---The whole area of the building was also ESD protected.
--- End quote ---
The whole building was filled with only iron, like a lathe shop? Did nothing dielectric exist?
m k:
D as discharge.
Protected against unwanted discharged.
Charges can't be avoided.
andy2000:
One example of where an isolation transformer is useful is when I need to work on the primary side of a SMPS. It allows me to connect the ground lead of my scope probe to the hot primary side ground. Such power supplies often have a large heat sink on the primary side that is tied to the hot ground. Using an isolation transformer means I don't have to worry about accidentally touching this. Both of these remain true even if the safety ground is connected.
S. Petrukhin:
--- Quote from: andy2000 on February 11, 2024, 05:02:35 pm ---One example of where an isolation transformer is useful is when I need to work on the primary side of a SMPS. It allows me to connect the ground lead of my scope probe to the hot primary side ground. Such power supplies often have a large heat sink on the primary side that is tied to the hot ground. Using an isolation transformer means I don't have to worry about accidentally touching this. Both of these remain true even if the safety ground is connected.
--- End quote ---
If you decide to participate in the life of the high-voltage side, then the separating transformer will protect you by galvanic isolation from the phase. A rubber mat under your feet will do the same. Or rubber gloves. :)
But this is not the solution!
1. You can touch the two conductors in the high-voltage part.
2. If you detach from the PE circuit, you will receive interference in the air.
3. By connecting the ground terminal of the oscilloscope, you will receive a PE conductor from oscilloscope and the whole earth jumps with interference.
The most reasonable thing is probably to use a differential probe and be careful when performing manipulations only after power is turned off.
Do not rely on an insulating transformer.
Siwastaja:
--- Quote from: andy2000 on February 11, 2024, 05:02:35 pm ---One example of where an isolation transformer is useful is when I need to work on the primary side of a SMPS. It allows me to connect the ground lead of my scope probe to the hot primary side ground. Such power supplies often have a large heat sink on the primary side that is tied to the hot ground. Using an isolation transformer means I don't have to worry about accidentally touching this.
--- End quote ---
This must be a troll, must be a troll, must be a troll.... I truly HOPE this is a troll.
Note to those who don't understand why this is a troll: isolation transformer here gives you the false sense of security, while the oscilloscope ground lead re-establishes the galvanic connection to building earth, therefore making the primary side, which andy2000 does not worry about touching, lethally dangerous again.
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