SEL300G Commissioning

[Elmir]

We are qouting some work which requires generator protection testing as part of the package. The relays used are SEL300G.

I have no expererience testing gererator protection but have experience commissioning line, feeder, bus and transformer protection.

If anyone here has any experience testing these relays I would appreciate a suggestion as to how long the relay alone should take to commission. I understand there are many variable involved. I am just looking for a ball park estimate considering a relay with many utilized functions and settings.

Thanks

 

[cranky108]

This partly depends on how you do your testing. Some companys don't test very much on microprocessor relays, and some companies test every function.

In general a commissioning test of a new relay should follow the book, then a test of all the inputs, outputs, and metering. Also testing of the attached systems. Some settings require the unit to run to do the measurments. Some calculations, and adding the settings to the relay.

This can also depend on the number and placment of your test switches.

In general, a few days for the commissioning test, a few days for the attached systems (depending on your waiting time between tests), some time to put the unit on-line. Some time for measurments (after the unit has been on line).
You should get some idea from this.

The worst part is finding they haven't connected something yet, and you have to wait.

 

[pwrengrds]

About 2 Days, one day for relay testing and injection of CT/PT /trip tests and a second day for functional testing, assuming that the generator can be started and ran. This would involve seeing the generator trip on reverse power, seeing correct CT currents, PT voltages, power, correct PF, that kind of thing.

 

[dpc]

I agree that two days should be adequate, assuming the settings file is ready to load. Maybe three days if there are a lot of functions being used, and lots of I/O to deal with.

 

[rcw retired EE]

Clarify that your bid includes just the inital testing. We usually have the relay test engineer stay on site during synchronizing and some performance tests which occur a few days or weeks after the initial tests. Once the unit is running you may have to verify signals at the relay: voltages, currents, phase angles, etc. Lots of stand around time.

If you have to program the sequence of event reports, alarm systems, communications, that can take some time; especially if you have to troubleshoot communication problems.

I've typically seen a generator relay take about 3-4 days, depending on how many questions and the familiarity of the engineer with the relay and the quality of the setting calculations and documentation.

 

[esee135]

+1 on the depends on your testing methodology.

If you do secondary injections into the relays, that is a lot of testing, usually 1 week, then plan for some online time to tune in the 64S style functions against third harmonic readings, and a day of load readings.

 

[alehman]

I'd say plan on a week unless this is a copy of some previous installation. We just did an addition to an existing paralleling setup and it took about 3 days. This included installing settings, phase-out of wiring, startup and some fairly minor troubleshooting. The system was an identical copy of two existing units. It could be less if everything works as it should. Could be more if much troubleshooting is required.


Alan
“The engineer's first problem in any design situation is to discover what the problem really is.” Unk.