hello everyone, I have made a protection relay device with pzem 004 t. I observed the characteristics of the original protection relay, for example in the over current relay, if the relay setting is 10A. if a fault occurs for example 20A then the relay will disconnect faster, and if the fault is only 11A, then the relay will disconnect, but not as fast as a 20A fault. if it is applied on arduino is it possible? using the module or using the program only? I hope I get enlightened on this forum. thanks
this is not an introductory tutorial.. read the sticky at the top of the sub-forum you are posting into...
➜ I moved your post to a more suitable sub-forum
I doubt it.
You need to be a little clearer with your actual question and/or problem.
That means a schematic of how you are testing this thing you have created and the specifications of the devices.
From your description I suspect a bi-metallic strip must be heated to open the circuit and will reset when cooled.
You appear to want an amplitude control delay. The higher the voltage (overcurrent) the faster the trip. If it is below a given threshold then no trip. Once past a threshold it trips without any more delay. I am assuming it is to operate similar to a motor thermal overload protection system. They make breakers etc that do that. For a project it would be very doable, for real life the testing etc would be a huge expensive undertaking. Almost any of the Arduino units would work for this with the appropriate sensors. If this is safety related buy commercial items designed for this, the liability could be huge.
What you propose is not an easy task as the disconnect times are very short . You can do it with something to measure the current and any of the Arduino versions should do it .
You can buy such inverse characteristic relays - the thermal protection relays used with motor contactors for example .( ~$20?)
The characteristic needs to be coordinated with fuses in the system to provide protection of whatever device is connected . ( so the fuse would break a circuit before the relay rating is exceeded, the system mirroring the ability of the connected device )
In power system larger electronic versions are available .
Have a google of “ type C co ordination “ as an example .
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