Trip coil supervision
Trip coil supervision
(OP)
I saw a 132kV capacitor beaker with three individual pole operating mecanism.
obiviously the breaker has three separate individual trip coil for three poles.
Now for supervison of trip coils, In my opinion, we need three separete coil relay (could be a one reay with three coils)
I saw single coil supervision relay in the circuit for supervision of three trip coils that are in parallel.
I believe the circuit is not good.
Do anyone have experience of supervising three parallel trip coils with one coil relay.
Thanks in advance for advice.
Pukar
obiviously the breaker has three separate individual trip coil for three poles.
Now for supervison of trip coils, In my opinion, we need three separete coil relay (could be a one reay with three coils)
I saw single coil supervision relay in the circuit for supervision of three trip coils that are in parallel.
I believe the circuit is not good.
Do anyone have experience of supervising three parallel trip coils with one coil relay.
Thanks in advance for advice.
Pukar






RE: Trip coil supervision
Some relays can be specified with several trip output contacts with built-in coil monitoring so single pole tripping and monitoring are possible. Most relay designs still look for a single trip coil.
Other systems depend on the pole diagreement alarm to alert the operator action or initiate a breker failure action.
In my limited experience, the primary cause of trip coil failure was loss of trip circuit power. A single monitor will alarm for this condition.
The expense and complication of monitoring three coils oer breaker createw a lot of complexity which can lead to reduced reliability. Except for very critical circuts, the added benefit is not worth the cost and complexity.
RE: Trip coil supervision
Thank you for the nice explanation.
Pukar
RE: Trip coil supervision
We use one TCS per coil.
Possible use a one device for the 3 coils, for example TSG 930: http://www.seags.ch/ses/tsg/.
Importnat point: monitoring of trip coil of openeed CB
Good Luck
Slava
RE: Trip coil supervision
RE: Trip coil supervision
Disadvantages:
1. The alarm will sound when a trip is activated.
2. A shorted trip coil cannot be detected.
rasevskii
RE: Trip coil supervision
Go to:
7PA30
RE: Trip coil supervision
rasevskii said.
Some resisitor about 30kOhm for 220V DC across a 52a contact.
current about 3-7mA, enough for supervision, voltage about 60V.
Isnt exactly, usually used NC contact of CB, etc...
This is a idea.
Used for decades.
Best Regards.
Slava
RE: Trip coil supervision
Here's one of the more common British trip circuit supervision relays, the GEC MVAX, which has some explanation of operation and some typical application circuits.
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If we learn from our mistakes I'm getting a great education!
RE: Trip coil supervision
The new single pole capacitor breakers, that I know of, have an electronic module which monitors the trip coils, as well as manages the close functions. The second trip coils, are not controled by the module, and each coil should be monitored.
RE: Trip coil supervision
RE: Trip coil supervision
you have to have three 74/TC trip coil supervision.