Jeffrey Brown reached out to help announce his new book, Power Line Carriers – Simplified: A Field Engineer’s Perspective I don’t know much about power line carrier. I’ve only
Continue readingA reader has requested some help for an upcoming project: I will be reviewing some relay testing that needs to performed shortly and I am trying to understand how the 27/47/59N (within a SEL 387E) relay
Continue readingI’m writing a blog post to help people buy a protective relay test-set that’s right for their application. What electromechanical relays require the most VA, or compliance voltage, to test? I
Continue readingSituation after CT Primary Injection: New 230kv breaker Testing CT’s, 4000/5, by high current injection injecting 80 amps A phase to ground the secondary leads are shorted in a junction box A-B-C-N
Continue readingSEL 321 OSB upper tests fine, lower is no-op but 51g comes in any ideas? I’m oversight on a project, test company is using a Doble 6150 w/ RTS, I’m not very familair with RTS sdg
Continue readingI can not find up dated information on this relay. I am testing with a manta 5000. I put 60 vac 60 hz on leads 7 and 8 and the relay picks up. Then on lead 11 & 12 I put 180 Hz and bring up vac to
Continue readingTo all, We had a SBF-1 Breaker Failure Relay fail on us yesterday. The time delay was not working properly. We have many of these relays on our system and wanted to see if there has been a Relay Advisory,
Continue readingHappy New Year! Does anyone have experience with the Basler BE1-50BF Breaker Failure Relay that has the Control and T1 timer pots and test points on the front of the relay? There are no timer setting
Continue readingDoes anyone have a practical plan for testing the reclose function? I have used amp buckets run through the the breaker to the current input so that the fault current is present as soon as the breaker
Continue readingDoes anyone have experience with this relay. More specifically, how are the optical sensors tested during routine maintenance? This looks like a very good relay, but I have concerns about how this unit
Continue readingI have a questions about the Phase Differential settings for the GE Multilin 489 Diff. Trip Min. P.U. is — 0.10 X CT What are they referring to the CTR 3200/5 or the Generator Diff. Trip Slope
Continue readingIs there any method to locate the fault in the PILOT wire which normally available in substations? The cross sectional area may be very small about 6 sq mm and is having DC 220- 250 V. Please suggest some
Continue readingIt would appear that everyone is either having no issues with ABB relays or ignoring them in hopes that they will go away. That said, is anyone using a Doble 6150 w/Protest and have good results? nu...
Continue readingpeace be with you all Can you give me an idea, how to test SIEMENS 7sj622 directional o.c and directional e.f fault relay by using omicron .freja or any Numerical testing instrument? regardes mohammad
Continue readingI am attempting to test the Negative Sequence Overcurrent on a 351 and 351S with an Omicron test set and my test plans just don’t seem to be working very well. I have managed to get a one shot to
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