breaker schematic symbols

[Aru]

I have a breaker schematic here. Will someone please guide me to understand what TOC is? Thank you.

 

[Dennis Alwon]

Could it be time overcurrent???

 

[ron]

IEEE Std C37.2 and IEEE Std C37.20.2 describe the TOC switch as a truck-operated contact or truck-operated cell switch, mounted in the stationary housing (cubicle) and arranged to indicate the position of the circuit breaker in the circuit breaker compartment. So, the corresponding definitions are:
52TOC-a an auxiliary switch (installed in the stationary housing) that is closed when the circuit breaker removable element (truck) is in the connected position, and open when the circuit breaker removable element (truck) is not in the connected position.
52TOC-b an auxiliary switch (installed in the stationary housing) that is open when the circuit breaker removable element (truck) is in the connected position, and closed when the circuit breaker removable element (truck) is not in the connected position.

https://www.downloads.siemens.com/download-center/download?BTLV_44771

 

[dkidd]

According to the SEL manual it is time-overcurrent.

 

[ATSman]

Could it be time overcurrent???

Since it looks like the terminals of an SEL protective relay I would say maybe.

I have also seen this symbol used as a contact on a cell position switch to indicate
that the circuit breaker (LV or MV) is fully racked into the bus (cubicle) on drawout
switchgear.
GE in the old days, on their Power Vac MV vacuum breakers, called this contact/ device a Truck Operated Contact, hense "TOC" for the same function.

I guess I was too slow on the draw:lol:
I see others have answered before me so disregard.

 

[jim dungar]

Normally I would expect TOC to be a truck contact. However, in this drawing their is no indication which breaker the TOC is associated with.
I need to see the SEL configuration of the input and how it is used in the logic.

 

[GeorgeB]

I have a breaker schematic here. Will someone please guide me to understand what TOC is? Thank you.

I've read the other answers, and think it is Timed Open Contact

 

[Ingenieur]

Since it is a relay input the truck operated contact is probably it

if an output why not use the 51 designation?

the 52's are cb position feedback contacts

 

[Ingenieur]

https://cdn.selinc.com/assets/Liter...s/351-5-6-7_DS_20160715.pdf?v=20160815-111713

Pg 14
IN102 'trip ckt monitor'

 

[rian0201]

https://cdn.selinc.com/assets/Liter...s/351-5-6-7_DS_20160715.pdf?v=20160815-111713

Pg 14
IN102 'trip ckt monitor'

In202 is the trip ckt monitor.. It is connected in parallel with the trip contact..

From me, i should look at the legend.. Hihi.. It could be overcurrent or the trunk open contact.. Trunk open contact in most cases are mechanically interlocked, i normally but monitor this one.. It could overcurrent signal from other relays..


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[Ingenieur]

In202 is the trip ckt monitor.. It is connected in parallel with the trip contact..

From me, i should look at the legend.. Hihi.. It could be overcurrent or the trunk open contact.. Trunk open contact in most cases are mechanically interlocked, i normally but monitor this one.. It could overcurrent signal from other relays..


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Not in the manual
IN102 trip ckt monitor
IN202 unassigned programmable input
???

is wired with Out101 shunted by IN202
I'ld like to see the rest of the ckt

 

[rian0201]

Not in the manual
IN102 trip ckt monitor
IN202 unassigned programmable input
???

is wired with Out101 shunted by IN202
I'ld like to see the rest of the ckt

The manual has nothing do the question especially if the input has been assigned to other things.

In the figure, out101 is assigned to trip.. It is clear in the diagram. To assign a trip ckt monitor, all you have to do is connect this input parallel to tripping ckt to monitor the circuit.

In202 will allow some current to pass through its coil. But this current cannot activate the main tripping coil but enough to activate the optoisolated input.

Please refer to "breaker trip circuit design" ieee report on relaying committee website.

No programming is needed in in202. If this activated it means ckt is okay ready to trip.. If not it could breaker open or something else. That the time you will create some logic for alarm or other purposes.


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[Ingenieur]

The manual has nothing do the question especially if the input has been assigned to other things.

In the figure, out101 is assigned to trip.. It is clear in the diagram. To assign a trip ckt monitor, all you have to do is connect this input parallel to tripping ckt to monitor the circuit.

In202 will allow some current to pass through its coil. But this current cannot activate the main tripping coil but enough to activate the optoisolated input.

Please refer to "breaker trip circuit design" ieee report on relaying committee website.

No programming is needed in in202. If this activated it means ckt is okay ready to trip.. If not it could breaker open or something else. That the time you will create some logic for alarm or other purposes.


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just telling you what the manual says
OUT101 trip contacts
IN102 pre-programmed non-optional trip monitor
IN202 is an optional input card programmable

not disputing when out101 trips in202 is turned off
they are in parallel
when out101 is open you have v across it
so you have v across in202 holding it on
when out101 closes/trips v across in202 goes 0 and 'off'

 

[rian0201]

In102 in the diagram has been labeled cust use... Customer use... Obviously i wont refer in the manual.. It will give confusion..


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[Ingenieur]

In102 in the diagram has been labeled cust use... Customer use... Obviously i wont refer in the manual.. It will give confusion..


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in102
I don't see cust use on it???
I think it is cb trip feedback
in202 is relay trip feed back or loss of trip power

 

[rian0201]

Haha sorry that out102... In102 is probably trunking cb

In my place, and in the installations and designs i have made.. We use this kind of setup like in202 as trip ckt monitor.. So if no power, and the breaker is closed, it will declare an alarm.. This has also been published in the ieee document similar in this situation.

Other relays like basler be1-11 series have already a coil connected in parallel to one on its output builtin to its board.

Is loss of trip power and trip ckt monitor not the same?


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[Ingenieur]

Haha sorry that out102... In102 is probably trunking cb

In my place, and in the installations and designs i have made.. We use this kind of setup like in202 as trip ckt monitor.. So if no power, and the breaker is closed, it will declare an alarm.. This has also been published in the ieee document similar in this situation.

Other relays like basler be1-11 series have already a coil connected in parallel to one on its output builtin to its board.

Is loss of trip power and trip ckt monitor not the same?


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No problem


Depends
in this case if in102 on and in202 off = trip
if in102 off and in202 off = loss of power or cb did not respond
Could also be a logical combination with cb status 52's, doubt it though, probably used to select a settings group

Just speculation without seeing the rest of the drawing

 

[nyscene911]

TOC is this drawing is the truck operated contact showing if the breaker is racked in/out. Those look like Eaton drawings. If you look on either that drawing or the previous page it should identify the TOC & MOC contacts.