Hi Ron,
Belive me I didn't have a 'cockin clue what you were trying to explain. :?
Im am by no means a expert, just a humble diesel mechanic!! LOL and no education in electronics, just about 15 Years of practical experience. I never bothered much about theory! (I suppose that's why you confused me?)
I built this circuit on breadboard and could therefore experiment with a couple of components. If I ommited the C1 - C3 it seemed like it does not want to work. I also thought that it could be that the input signal is AC and the op-amp would like to have some sort of positive signal only.
I tried to load the CT with a 100R resistor but then sweet ef all happened.
Actually weird!
Now did I confuse you??? Hehehehehehehe
Specifications on the CT are as follows:
Primary 30A
Secondary 5A
2.5 VA
No of Turns of Primary 3T
This is my basic idea of the circuit:
If you connect a scope to the output of the op-amps you will see a positive pulse whenever the voltage of the CT goes above Vref (Adj. by VR1 - VR3). This pulse I feed to a "Pulse stretcher" which is the first 555 Timer. Monostable with t=1.1*C*T (HA! See I knew one formula!!) which gives you round about 1.1 Seconds. You will see that it is re-triggerable.
The second 555 is configured as a "Delay ON" which gives you about 5sec
before finally triggering the third 555 which is configured as a "Flip Flop". Note it's "own" 0 V supply for the second timer.
The reason for the delay on is to compensate for Inductive (reactive) loads on the generator. The "Delay ON" timer" give you that extra time in the event of a momentary overload.
Thanks Ron for spotting the mistake! Youré 100% right. it is a mistake.
You got a Eagle eyes huh?
I really appreciate your input
Next step would now be to find a suitable enclosure for the circuit. But nowhere in South Africa (just south of us) can I find enclosures for DIN rail mounting. I stripped an old 11 pin relay housing and shove it all in there! Hehehehe
Regards,
Chilli