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I think the Mar 23, 2013 date is when you set up your Eng-tips account.

| don't think it is either an IEC or ANSI symbol. Looks more like a horn gap switch symbol, but that would not provide the protection needed.

You need a three terminal 87T, with the third terminal connected to CTs on the 4.16 kV side of TR-2k.

It's either a programming issue or you are connecting a "b" contact to the relay input instead of an "a" contact.

Deactivating points and hiding attachments reduces processor (CPU) requirements but doesn't change the file size. The points and attachments are still in the file.

To get the weight span, calculate the catenary with vertical loads only.

The 24.5 kV neutral should be connected to the H0 bushing. There will be current in the neutral during a ground fault on the 24.5 kV system even if the generator is not connected to the transformer. The delta-wye transformer is a ground source.

Transmission reactive costs are normally (in USA) paid by a reactive supply & voltage charge which is calculated by multiplying the transmission company's revenue requirement by the load ratio share (weighted average coincident peak of measured kW divided by the weighted average transmission...

Using Waross' example. Consumption will be measured at the Delivery Point between C and B every hour (in my experience, kWh are measured). Someone schedules the expected delivery at the border between B and A, and generation at A. Power is generated at many generators to meet all of the loads...

The ground connection from the arrester ground to the equipment ground should be as short as possible. This would normally be at the pole neutral/ground where the equipment is grounded at the pole.

If the strength of hard drawn copper is required for mechanical reasons, then it may be prudent not to exceed 250°C to prevent annealing of the conductors.

crshears, You may avoid a little discomfort by wearing conductive footwear when touching control cabinets. If you are not standing on a ground mat and touching a grounded structure when a high voltage ground fault occurs, you may experience fibrillation and death if you aren't wearing...

With a grd Wye - grd Wye connection to the utility, the BESS system may be furnishing zero sequence current to utility system unbalanced load. There also may be unbalanced plant load causing neutral current. If the neutral is grounded both at the service entrance and at the BESS, there could...

The only change needed to the drawing is to change the voltage in the title block.

The US National Electrical Safety Code (NESC) does not distinguish between 750 V and 22 kV with respect to required clearances.

kW demand is the difference between consecutive 15 min kWh readings times 4. If you have an average power use for 15 minutes of 1 kW, then the kWh usage for that period is 1 kW time 0.25 hr, or 0.25 kWh.

Some utilities provide more detail. I can go in the Duke Energy website, or use their mobile app, and download kWh readings in 30 minute intervals for my home energy meter. With this, you can calculate 30 minute demand values.

You could do it in either program, but it's much easier to get to look nice in Excel. You can then copy and paste into an AutoCAD drawing.

Changing two phases will cause any 3Ø motors to run backwards (or try to until something trips or breaks).

If you use another phase for the 0°, you will get a different answer, but only because the angles are rounded to zero decimals. Note that the sum of all of the phase angle differences has to equal exactly 360°, but 119 + 119 + 123 = 361.