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Hello everyone, I have been scratching my head for some time over the meaning "30C rise over 40C ambient". I have read this footnote under many, if not all, manufacturers' specification sheets when determining the ampacity of the busbar. Anyway, i am trying to determine what this actually...

Good morning All, We had a turbine in one of our wind farms whose aluminum hollow conductor running down the main shaft to the converter burn at the point of bonding. Since this aluminum bus bar is identical to those found in substations, I wanted to know if there is a standard and common...

Hey everyone, I was wondering if there is a manufacture who makes utility scaled PV combiner Boxes with a DC disconnect switch that separates both the positive and negative feeders. My thought is that once the hot lead is disconnected then there should not be a positive voltage at the inverter...

Thank you!

Does anyone have any recommendations on a Electric Power Systems Textbook that covers the basics/fundamentals and is technical and up to date? Thanks,

The primary and secondary are 138kv and 34.5kv respectively. The inverters are on the secondary side of a medium voltage transformer, stepping the voltage from 370V to 34.5kV to the collection system. Yes generation is on the low side, and connected to the utility on the high side. The tap is...

Hey everyone, I am looking into adjusting a tap on your 110MVA Main step up transformer. I know the voltages are a direct correlation to the turn ratios. The issue we are having is the voltage on the low-side is getting to high, forcing inverters to trip since they are out of their voltage...

How can you verify that all the consumption of your PV system connected on the line sidde is being absorbed at the bus bar without having a meter? I assume using kirchoff's current law that you can verify it is but what is holding it back from backfeeding the system? This is just making me...

This is a bi-polar system connected to a inverter with inputs of +1000VDC and -1000VDC. The Gigavacs are attached to a fuse holder (wire in blue). What i have encountered is that some of these Gigavacs whose contacts were rated for 6kV were changed at some point. The remaining Gigavacs are...

Hey all, I am having trouble determine why a relay is rated for 10kV and not anything else. I only ask this question because we have an issue at a site where we are using utility sized inverters with corresponding combiner PV ties. These inverters will send a signal to the combiner PV ties...

Hey everyone, This is my first post on this forum so hello to all! I have read a ton about the separation of power cables and communication with various "rule of thumbs" on the distance between for optimal reliability. Can anyone point me to the code reference for this rule of thumb? Is it...