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If you are expecting all phases to be on, or no phases to be on: a neon/led (w/ series resistor, led with protection diode) between two of the phases - that will tell you that at least one of those 2 phases are available..
If you are expecting some of the phases to be available while others are not, then that seem a bit strange to me...
Delta configuration.
Each resistor shown in the attached diagram will have an opto coupler input in series with it. The points of the triangle (X,Y,Z) are where each of the 3 phase power is connected
What is the peak phase-phase voltage (Vpp)? What is the peak allowable current through the opto input (Ip)?again , what will be the values of resistor..
What is the peak phase-phase voltage (Vpp)? What is the peak allowable current through the opto input (Ip)?
The resistor value will then be [latex]R\approx\frac{V_{pp}}{I_p}[/latex]
You can look it up based on your country. Try google.How should I find out
Ok I have the following configuration in India :You can look it up based on your country. Try google.
There has to be commercial phase protectors available in India. They are really common in the US.
Generally I used them to protect EXPENSIVE stuff like a $5,000 USD roots blower and protecting devices such as Cryochillers such as this one: **broken link removed**
It was also used on some 3 phase vacuum pumps. An aprox $100 USD device was very worth much it. It easily fit into the relatively large motor control disconnect, overload relay and contactor. Later, the overloads were replaced with solid state units when they failed after 15-20 years.
If your lucky, the solid state overload relays will have built in 3-phase protection so the extra box isn't required.