Valence Electrical Training Services
Shares

Category Archives for From Other Testers

A New Power Line Carrier Book is Now Available at www.plcexperts.net

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 reading

Help with 27/47/59N Protection in an SEL-387E

A 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 reading

What Electromechanical Relay Kicked Your Ass?

I’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 reading

CT Primary Injection Ratio Testing Problems

Situation 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 reading

SEL-321 Out-of Step Protection Problem?

SEL 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 reading

ASEA RAGEA 27N Gen Neutral Undervoltage

I 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 reading

SBF-1 Westinghouse Breaker Failure Relay Failure Question

To 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 reading

Basler BE1-50BF Breaker Failure Relay Testing

Happy 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 reading

Reclose Function

Does 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 reading

SEL751-A Arc Flash Relay

Does 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 reading

I have a questions about the Phase Differential settings for the GE Multilin SR-489

I 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 reading

Locating fault in the PILOT WIRE between substations

Is 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 reading

ABB REL 512

It 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 reading

Testing Siemens 7sj622 Relay’s Directional Overcurrent and Directional Earth Fault Elements

peace 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 reading

SEL-351 Negative Sequence Overcurrent Testing Problems

I 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

Continue reading

Send this to a friend