Hand Trip Control Vs Touch Screen Control
Hand Trip Control Vs Touch Screen Control
(OP)
Hello:
We are in the process of upgrading our relaying system at our main substation. We are replacing all of our Westinghouse/ABB electromechanical relays with SEL relays + a SCADA system.
One modification that has caused concern is the replacement of the individual 15kV air circuit breaker operating switches (open/close/lockout)with a Human Machine Interface (HMI). The HMI will have a touch screen to control the air circuit breakers (among other functions). The general feeling (old timers) is that the HMI is the way to go, but we should retain the manual switches (just in case).
What is the general contemporary design trend?
Thank you.
We are in the process of upgrading our relaying system at our main substation. We are replacing all of our Westinghouse/ABB electromechanical relays with SEL relays + a SCADA system.
One modification that has caused concern is the replacement of the individual 15kV air circuit breaker operating switches (open/close/lockout)with a Human Machine Interface (HMI). The HMI will have a touch screen to control the air circuit breakers (among other functions). The general feeling (old timers) is that the HMI is the way to go, but we should retain the manual switches (just in case).
What is the general contemporary design trend?
Thank you.






RE: Hand Trip Control Vs Touch Screen Control
My experience has taught me that you should retain the manual open/close/lockout operating switches but also add another switch for 'local/remote' control. You may never need to go to manual control, but it's cheap insurance.
RE: Hand Trip Control Vs Touch Screen Control
You could get rid of the lockout feature, but the trip through the manual control switch should remain enabled IMHO.
RE: Hand Trip Control Vs Touch Screen Control
Open command to breaker MUST be handle control, directly connected to the trip coil and prefererd with latch option.
Close command-- up to you, for my pinion, today is via HMI.
Best Regards.
Slava
RE: Hand Trip Control Vs Touch Screen Control
RE: Hand Trip Control Vs Touch Screen Control
RE: Hand Trip Control Vs Touch Screen Control
With new relays you can make the operation of the door switch an 'event' for record, but that door switch should be the common denominator short of mechanically tripping a breaker.
old field guy
RE: Hand Trip Control Vs Touch Screen Control
RE: Hand Trip Control Vs Touch Screen Control
RE: Hand Trip Control Vs Touch Screen Control
Very imortant,Cranky's : suggest if you go this way consiter the covers
From last friday
RE: Hand Trip Control Vs Touch Screen Control
There is nothing wrong with having manual control switches but HMIs have proven themselves to be a reliable technology and are used extensively in other industrial applications. In general the substation world is very conservative and not exactly on the cutting edge of technology.
RE: Hand Trip Control Vs Touch Screen Control