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I am curious if any one call tell me the advantages or disadvantages of using a spark gap over a varistor for over voltage protection. We are using a spark gap to keep an output voltage from going over 400Vrms.

ScottyUK, check out www.on-lineinc.com for a reliable battery monitor if you are looking for a monitor in place of the Vanner unit.

Is anyone familiar with the On-Line Monitoring/BTech battery monitor? I have heard that it is easier to install and more cost effective than the others

Do any of you use or believe in on-line monitoring of substation batteries? I have heard many pros and cons but feel that it is worth the cost to know that all cells are in good condition when an outage occurs.

I am trying to find instruction manuals and drawings on the following: GE SF6 345 KV Current Transformer Part# HTSH710921 The following numbers are also related to these CTs HTHD75B119 AND HTHD74A179 BIL is 1050 kV. the nameplate had the following data: GE NATL BD 55002 DIV.1 Sh. 250 1971...

It is not too unusual to see differences in data between test labs and from different methods of taking samples. One of the DGA manufacturers gave a paper a few years ago showing the differences between labs with known samples. TJH2B also has some good papers on their web site about taking...

Also, time of day can make a difference in the sample results, we have seen that samples late in the afternoon after the sun has heated the transformer will result in higher gas levels then those in the morning. This is also due to the fact that the samples are taken from the bottom of the...

The best way to track and find problems with Valve Regulated batteries is to install a continuous monitoring system on them. You can then track and record current flow to the battery, and temperaures of each battery. The system will alarm before the battery explodes giving you time to perform...

Thanks for the help!

A doble test is a power factor test, and there are several suppliers of PF test equipment, such as: Doble, Megger, and On-line Monitoring Inc.

Does anyone know of a generic LTC symbol that I can use as a graphic?