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Thansk for the response. However, the question was not about control voltages for HV breakers but the DC breakers used in the 250VDC distribution system. Exactly the feedback we got. Eaton stated that they'd be willing to do type tests for us but at an exorbitant cost and lead time.

Thank you @davidbeach and @che12345 for the helpful replies!

We have a substation DC loads supplied via a 250 VDC system. The charger float voltage is actually 270-280 VDC. The question that came up was that all the standard breakers are rated for 250 VDC, and none of the application engineers from Schneider, Eaton, ABB etc. are willing to state that the...

2.5L800 is a CSA designation (CSA C61869-2). It corresponds to ANSI B8 (200VA) burden rating. Thanks for the helpful replies everyone. Seems like the RF is 2.0 on the primary windings. The client's practice of using the CT primary ratio as the limiting current in a branch is done by the...

Hi, I have a seemingly simple question, yet its causing some debate in our team. Our client uses equipment's rated currents to determine Substation line bay min. ampacities (breaker, CT, disconnects etc.). In one case, there is a CT with a min. connected ratio of 800:5 which limits the line bay...

prc I am interested in learning more about this statement: "when a surge travels through a short length of cable it can get amplified at receiving end" Does any standard quantify this? Don't think IEEE C62.22 takes this into account for separation distance calcs. Any more insight would be...

Hey everyone, Great discussion going on. Some more updates.... The transformer manufacturer (Siemens) confirmed that mounting arresters next to the bushing is not an option unfortunately. They also confirmed that the plug-in bushings are ABB. The configuration is..... GSU HV bushing -> 25-30m of...

Not sure where you got the first screenshot from but all I see in the interface is the second one. Functionally the 2nd interface can still work if you want to define 11kV cables as you have already done in your screenshot. Contacting SES directly would be your best bet I guess...

Thanks cuky2000 240kV solutions (such as the one you shared) are difficult to get per the vendor but they are looking into options.

Thanks very much prc for your response. I have dealt with Pffister before and will request them for a solution. The reason for using this configuration is that existing transformers are being re-deployed to this site. The manufacturer quoted cost for changing out the terminations to...

For larger generating stations and transmission substations, step and touch voltages are dependent on the Ground Potential Rise (GPR) of the site which is directly proportional to the ground fault current and Ground resistance (IEEE 80 pg 5). Also check Section 4.2 of IEEE 80. Basically the...

Hi Everyone, I have a Generator Step Up (GSU) Transformer with the HV side at 240kV. The high side terminations are via 'plug-in' bushings that only allow for termination of a 240kV power cable. My concern is with placement of a surge arrester for Transformer protection. In a standard air...