All posts by TechTalk Contributors

I highly recommend this course to anyone who tests relays no matter what their skill set is.

I was really impressed with the instructors knowledge of both the test equipment and the relays which we tested. I have been to several advanced relay training courses and this was by far the best yet.

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A different perspective on relay testing

A different perspective on relay testing, especially since most testing companies use automated testing. It helps better understand the operation of the relays and how the results were obtained. Not just

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Bravo Mr. Werstiuk, (author), you have accomplished in a few pages the equivalent of a semester of test school.

I have been in electrical testing for the past 15 years and have worked for NETA shops and utilities. The booket is excellent for a beginner as well as a seasoned test technician. I purchased this for

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I wish I had found your books a while ago

I have just bought your protection relay testing set of books about a few weeks ago and I just wanted to say that I’m very impressed with it. I have been commissioning power systems for a few years

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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

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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

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SEL Test Procedure Negative-Sequence Volt-Pol Directional Overcurrent Element

I am writing to enquire about 67N test procedures, specifically Schweitzer relays. The Page 94 of the Relay Testing Handbook #C2 : Practical Relay Testing (50/51/67/59/27/81/87/21) by Chris Werstiuk says

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Real World Problem With an SEL-300G Synch-Check

Here is a story from one of our Customers at Manta Test Systems: “I had to troubleshoot a Schweitzer SEL-300G relay yesterday that had the (25) Sync-Check element enabled, but wouldn’t assert the

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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

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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,

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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

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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

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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

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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

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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

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