Unknown Devices

I don't know this simbol as it is as well, but by the look apears to be a full wave rectifier

you see, as all can read by the diagram an opto isolator conected to a fuse and a large capacitor, and a few + and - simbols have all the logic! you are right and electronick is wrong! long live dumptronicks

the idea was not to offend any one! not even to assume to know everything, when I know that is not the case! If I did my apologies! but to defend the other opinion wich it appears valid as well... to be honest I think the designer of the circuit wanted to simbolise a rectifier electronicaly driven, and it may so hapen the gate triger to turn on that device may be a optocopler ok ? or it can be other. take it easy once there is a lot of crisis out there and you not need to make a storm in a glass of water! all the best!

ok boy!!! tanks for the help pouch! calm down now.

the freaking dog made the answer I guess !!! tanks! have a nice year!!

yo, freaking einstein, so you know already the price of a report?

you mean when the work is all done, but when jumping trains you loose all that was wrote?; do you mean when you leave the tent to check the surrounding and all of the sudden began to rain cats and dogs?; or, perhaps you are referring to the alien radio signals that just keep on following you and interfering with everything around!; nop, it is those kind of situations when you have to alert Houston... the price I cannot compute. let others decide mate

hard misson joe?

something like that bogzie! take it easy now puch!

The above is a full wave rectifier. Each triangle is a diode. I've never seen the symbol you have.

I'm also not familiar with that symbol for a four lead device. The symbol inside the four lead device looks to me like a way to draw a Silicon Controlled Rectifier, a three lead device. However, the gate lead is not connected to anything. It might help to know what the connections are on the left for that ten node terminal block.

It looks like a "Damping Resistor Circuit" for reducing the spike that will occur when the capacitor contactors change state. In small LV systems the resistor is in the circuit momentarily ahead of closing the main contacts by being connected with electro-mechanical early-make aux. contacts driven by the contactor. In some MV systems they are switched in with SCRs. The SCR gate circuit is not shown in the power diagram because it is not a power circuit, just as the contactor coils are not shown in that diagram. But it is typically inconsequential anyway, it is often embedded with the resistor unit and not a user serviceable circuit.

IT CALLED OPTO ISOLATOR

IT ONLY TRANSMIT ONLY SIGNAL NOT VOLTAGE OR AMPLITUDE

You should refrain from commenting on others' work when you don't understand it. Your two posts are totally wrong.

Not only wrong, but VERY rude!!!!!!

Do turn off Caps Lock before posting. Many readers consider the use of ALL CAPS to be akin to SHOUTING, and rather rude.

I have seen a whole lot of different types of optos, and they feature one L.E.D. (or two in parallel with oposite polarities, for bipolar or AC circuits). But I don't see in this symbol the streaking arrow that represents LIGHT comming out of the diode, much less the receiving device (i.e. phototransistor, either based or base-less, photo triac or photo SCR, Etc.

But despite this, you don't expect the power factor correcting currents to flow thru one opto coupler DO YOU ?.

I'd like to see the prodigy that you suggest in your desperate post: a signal with no voltage and no amplitude (wow).

I agree that it looks more like an optical isolator...

I think they are the solid state relays for switching of the capacitor banks as per the requrements.

Getting closer...

Very GA

I agree with shindvs that it is an opto isolator. If you look at the way it is wired, there is a single common on terminal 4 and three return wires on terminals 1-3. A pair of opto's are monitoring that each circuit is powered. This duplication suggests that sensing that the panel is correctly functioning is critical to the operation of the plant.

Or, perhaps it could be a current sensor?

Please post a good picture.

Any how it seems to be CT or opto-coupler/isolator [in all phases] to monitor Capacitor-bank current.

Outputs from all CTs connected to control TB

I thought the OP's pictures were better than many we see here!

I do NOT agree with the monitoring idea. Terminal 1 (bottom) is common for terminals 2,3, and 4. Each of those terminals 2,3, and 4 sends a control signal to turn on its pair of (Opto-Isolators / Solid State Relays) to connect the corresponding capacitor bank to the three phases of the line.

Note that drawing appears to have an error, where the leftmost capacitor bank connects to only two of the three phases!

I don't think that there's an error there. The capacitors are connected in a three wire configuration not a four wire configuration. So current will not flow through the third leg unless at least one of the other two paths is turned ON.

"So current will not flow through the third leg unless at least one of the other two paths is turned ON."That is true, and is why only two switching devices are required for each bank of capacitors.

The point I am referring to is:

On the left side of this part of the drawing, the left bank has two of the capacitors connected to the same phase, while the other two have one capacitor connected to each phase.

There is lettering on the drawing, but I can't quite read most of it.

You're correct, I was looking at the wrong part of the circuit. There appears to be an error there.

GA! good catch!

Leave it to a "Hang Town" man. Just down the road in CP.

GA

Thanks for the explanation of the part short hand symbol identification and the whole circuit functionality.

why it in one box it is opto isolator mean inside one LED & another side photo sensitive diode or photo diode

If you have a look at the link I provided in #9 (Triac Coupler) you will see that it may satisfy your intuitive belief.

A triac (opto) coupler provides isolated switching.

The position of these devices in the circuit screams control not monitoring.

I presume something similiar to solid state relays which can be controlled with various inputs.

GA Sir ! nothing but an SSR makes sense here.

Taking your picture and blowing it up in Adobe it appears to be a A/C - D/c rectifier. Neutral and 240 in. Or an early version of an SCR.

The fact that we are all having to guess what the devices are is a little disturbing.

What ever happened to using standardised symbols or functional blocks with annotations as required for oddities?

The original author of the diagram may have struggled to find a "standard" so she made up her own without an explanation and expected the reader to somehow just know what she was thinking.....

This is a complex assembly that doesn't have any standardized symbol that I know of.

I actually find it easy to interpret as it is in my field of work. It could certainly be difficult to recognize for a person used to low power electronics.

There is the issue of the error in the power distribution above the fuses. I find it strange that it made it that far without being corrected. Maybe the OP can give us more history behind this schematic.

Wal, why do you imply that the designer was female?

If I used male personal pronouns then nobody would give a rat's.

I'm all for gender equality. Males aren't always to blame.....

Getting back to your point here without the distraction of gender choice, its not so disturbing to me that we have to guess what a non-standard symbol means. What disturbs me is that the OP asks us instead of asking the originator of this document. I do believe marcot has accurately identified the mystery block generic function. However, unless one can refer back to real manufacturer part numbers and data sheets or even standard symbols the nominal and limitation parameters of this mystery block are still unknown.

Dis louks like some suort of double Schmitt trigger... Sie müssen den Abzug schießen, um den Motor auf Wiedersehen anzufangen!