what exactly is a remote substation?
what exactly is a remote substation?
(OP)
hi there
i am doing a fault analysis on a power system that consists of two substations interconnected by a line.
The purpose of this project is to determine the positive and zero sequence impedances of the line and the source for different types of faults. I am doing this so i can determine the correct settings for the relays by use of a specific software.
The fault is applied on the line interconnecting these substations. How do i identify the local and remote substations? Does it depend on the fault location?
please assist
thank you
i am doing a fault analysis on a power system that consists of two substations interconnected by a line.
The purpose of this project is to determine the positive and zero sequence impedances of the line and the source for different types of faults. I am doing this so i can determine the correct settings for the relays by use of a specific software.
The fault is applied on the line interconnecting these substations. How do i identify the local and remote substations? Does it depend on the fault location?
please assist
thank you






RE: what exactly is a remote substation?
RE: what exactly is a remote substation?
RE: what exactly is a remote substation?
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RE: what exactly is a remote substation?
so would it be correct in saying that the substation closest to the fault location is the local substation?( depending on the reach of the relay),and the other substation then become the remote substation.
RE: what exactly is a remote substation?
RE: what exactly is a remote substation?
Usually, about 90% of the line impedance is considered to be Zone 1 as seen by the relay, beyond this is the remote substation, which is in Zone 2, most of the impedances of any lines beyond that are Zone 3. Zone 1 has a certain ohm setting and no time lag, Zone 2 a higher ohm setting and usually a half second or 1 second time lag. Zone 3 yet higher with additional time lag.
Faults are phase to Earth (each phase) Phase to phase, or 3-phase short circuit.
The impedance measurement is directional, the relay looks outward to the line and sees only faults occurring in that direction. Faults in back of the relay location are not seen.
At the remote substaion there would be another distance relay looking toward the first substation. Unless there is no source of power beyond the remote station, i.e. a dead ended sysrem.
Go to the ABB library web site and look up descriptions for the classic relays RAZFE, RAZOA, REZ (1, 2, etc. ) there is a lot of info on calculations, theory, and info on distance relays there.
regards, rasevskii
RE: what exactly is a remote substation?
RE: what exactly is a remote substation?
Sorry, I was used to the old days in the Middle East, out in the desert, where we had all those old relay types...IIRC the smallest time increment was 0.5 seconds...
rasevskii
RE: what exactly is a remote substation?
However on short lines I would not set zone 1 more than 80% of the line.
RE: what exactly is a remote substation?