SPANISH ARTECHE RELAYs have good price , BUT IT IS NOT accepted by consultants,
GE and ABB are a good choice but their package for trip tcs lockout are more expensive than Siemens relays,
i hope i could find them in SEL products..but i cant find anything.
thanks,
but i hope i could find the same suitable replace for Siemens interposing relays,do you have any suggestion from number one brands?
i don't know electroswitch co. As i know the only number one brands for relay are : ABB. Siemens, SEL AREVA GE
i think , it is right that SEL-2652 is...
Anybody can help us about SEL set relays for this purpose Vs Siemens?
Based on my information :
Close relay : Siemens (7PA27) SEL (?)
Trip relay : Siemens (7PA27) SEL (?)
TCS relay : Siemens (7PA30) SEL (SEL 2652)
lockout relay: Siemens (7PA23) SEL (?)
I also found SEL-9502...
i don't to why we exactly use interposing relay in closing circuit.
may be when auto re close send close command and the cb close coil can not close the cb, the circuit will be opened by close relay instead of main relay contacts.
odlanor :
yes, based on Siemens answer you can series contacts of 7pa27 to reach this capability ( i think 3 set is required)
davidbeach :
it will be unlatched because when cbf is started other cb (connected to faulty cb ) will be tripped and they cleared the fault so trip will be unlatched...
I dont know the exact use of surge suppressor , i will ask someone.
anyhow as you said
TCS(7Pa30) use is : supervision of trip supply path of trip coil. it is used in closing CB interlock. if any fault exists in path of trip the TCS contact will be opened and the CB can not be closed (because...
Jg2828 : thank you.
if anybody works with SEL products , i like to have a compare with Siemens scheme about our topic subject.
i upload a file containing single line diagram of O.H.L
AS you can see, it contains :
3 trip relay for coil one
3 trip relay for coil two
1 close relay for CB close...
So, Conclusion is :
1- the only use of Trip and close interposing relay is : To prevent damaging contact relay just(and just) in breaking the trip current when we experience CBF faulty.
2- number of CB faults today...near to zero.
3- Some consultant spec and clients still insist on using...
So, Conclusion is :
1- the only use of Trip and close interposing relay is : To prevent damaging contact relay just(and just) in breaking the trip current when we experience CBF faulty.
2- number of CB faults today...near to zero.
3- Some consultant spec and clients still insist on using...
lz5pl :
your scheme is used in ABB protection scheme. AS you know ABB co. does not have trip relay and we use compounding tow set relay (one of them is high speed and for trip and other is heavy duty and used for breaking current). anyhow your scheme is cheaper.
when we have CBF, trip remains till fault clear(latch trip)
( fault will be clear by opening all CB connected to faulty CB ). so the CB will not be opened and the relay contact disconnect trip current.
jghtist :
the CBF (when trip comes and cb will not be opened) results : the cb contact between main relay and coil dose not change position so the role for breaking trip current will be done by main relay contact. ( just in this state we need trip relay)
the CBF function (86BF) does not make...
thanks Inpran, but the same as davidbeach said :
the main relays (numeric and others) have separate power supply (they usually supplied with DC system(battery or charger), So the load of CB coil dose not influence on them at all.
the brief conclusion : the only reason we can find till now is ...
Thanks All.
But one of its benefit is that in the CBF times (when CB was tripped but it was not opened.) the CB contact is still closed , so Ldi\dt will be opened by relay contact. if we not use trip relay , maybe, it leads to impair main relay contacts in that time.
on the other hand,these...
As you know, in Protection system we usually use close and Trip relay between Main relay (as commander) and circuit breaker.
These relays must have to main features, Heavy duty and high speed.
The main use of these relays is that, when main relays (for example Distance relay) sends trip to CB...
I want to do reliability analyze on different single line diagrams with different interlocking.
In this regards, i choose Digsilent software for this purpose. But i have a problem to simulate and perform interlocking in this software. it seems there is no option for that. Any body knows how i...
i think it is not so important which brand of relay are used.
i do not to learn about relay configuration setting.
i want to learn about detail theory of protection and dcs system or how we desing protection and control system for hv substation ,,which protection is needed and why,,,and ...
