Power substation relay misoperations
Power substation relay misoperations
(OP)
Any information on misoperation of power substation protection systems would be appreciated (categories and causes of misoperations, outage statistics etc.)
Michael Sidiropoulos
Transmission Planning - Pacificorp






RE: Power substation relay misoperations
The investigation indicated that the fault current in the ground grid induced the voltage on the control cables. The induced voltage in differential mode caused the current to flow in the circuit.
RE: Power substation relay misoperations
The bus differential protection might have lost stabilty during through fault (15kV cable failure). This is more likely, I feel, than the induced voltages during fault causing the relay maloperate.
The topic is interesting and I would appreciate any further feedbak on the subject.
RE: Power substation relay misoperations
http://www.computer.org/proceedings/hicss/0001/00013/00013025.PDF
· Shunt Reactors and Capacitors - These
elements are used to provide system voltage support or
correction and are protected by a wide variety of
protective devices; differential, impedance and negative
sequence relays for reactors, fuses and overcurrent relays
for capacitors. They are susceptible to misoperation as
system parameters change drastically under unusual
system events. Their misoperation would exacerbate any
system problem by changing the voltage at the associated
system node.
RE: Power substation relay misoperations
http://www.selinc.com/sel-lit.htm
I took a quick glance through their list, and this one jumped out at me (regarding sympathetic tripping problem analysis / solutions):
http://www.selinc.com/techpprs/6061.pdf
GE also has a good amount of technical papers on their site. Again, there may be something of interest here.
http://www.geindustrial.com/industrialsystems/pm/notes/index.htm
Also, part of NERC's Compliance Program requires electric utilities to report relay misoperations as part of each Reliability Region's Compliance Program (planning standard III.A). I haven't dug through NERC's site (or regional reliability council sites) to find out if any of this information is publicly available, but if so it may be helpful as well.
http://www.nerc.com/~comply
RE: Power substation relay misoperations
Michael Sidiropoulos