Clockwise vs Antoclockwise in LV Network of Utility

Maybe this will help.

Electrical Systems: Phase Sequence in Electrical Systems

I would think it standard procedure to check the phase sequence when repairing or installing equipment, and as long as your technicians are properly trained it might not be worth the trouble, and might avoid a lot of service calls from customers who's equipment has suddenly developed problems with the voltage supply...

https://www.allaboutcircuits.com/textbook/alternating-current/chpt-10/phase-rotation/

Counterclockwise is the accepted industry standard, and as such should probably be observed throughout your distribution network if only to prevent confusion among metering staff etc.

The only real tangible benefit from my point of view is continuity of practice over the entire network, there is no other benefit of using CCW vs CW.

Changing the CW ones to CCW would require isolation of the transformers and then changing of the leads to make them CCW, but this raises the problem that every multi phase consumer downstream of those altered transformers would now need to alter their phase sequences in order to make equipment continue to run in the intended direction.

This would likely be a cost to the distributor, and in many jurisdictions altering of the phase rotational sequence is not permitted without express consultation and agreement with affected consumers.

An addendum to my post for clarity.

You should be mindful of the convention in use when considering phase rotation.

A typical phasor diagram will show phase A at the top, phase B at 120° to the right, and phase C at 120° to the left.

This may appear to be a CW rotation, but is actually deemed to be CCW.

To understand this, picture the rotational relationship with A as the datum point. Phase B will lag A by 120°, and phase C will lag A by 240°.

With this in mind, when A passes through 0 volts (the top of the vector diagram) B will still have 120° to go, and C will have 240° to go to reach that zero point. Therefore the rotation will be in a CCW direction.

A then B then C reaching that top point on the vector diagram as they pass through 0 volts.

This is one of those threads that has the potential to go round and round in circles.

Reversed phase rotation is usually historical.

Where I first worked the phase rotation was reversed. This was a knock on from the 1930’s when we had our own power stations and distribution network. Once it was possible to have a bulk supply from the national grid our stations were shut down but the supply rotation had to stay reversed. If the supply company were to “correct” the phase rotation they would have large parts of Derbyshire and Cheshire with unhappy customers.

Too bad we can't set our phasers to "stun," like Star Trek did, and just zap them all to sleep for awhile!

I think changing the grid rotation is pretty dangerous as there are many 3phase driven machines which were installed to have internal the correct mechanical rotationf. And it is for sure that there are rarly used equipment in workshops where nobody is thinking about the issue that the motor is a three phase motor and that the rotation depends on the incoming 3phase rotation.

If you now change the rotation direction of the grid at the transformer, out of sudden these machines would spin in reverse - so a blower turns in a succing device, a lathe will turn in the oposite way from cutting to sreaming - pretty dangerous. And there are 3phase driven mobile equipment which are -might be- not connected during the time when changing the grid rotation like transfer pumps! Suddenly they do not deliver and are "out of order"! An nobody is aware that this issue is related to change of rotation direction in the grid - as only the Utility engineers know it.

So a change is only possible if tidious preparations are done and personal was looking into the last corner of factories, small businesses, households (ACUs! heating systems) to find possible dangerous devices operated with 3 phase electricity.

I would not touch these 17% rotating in the wrong direction - but be 100% aware if e.g. there is a 2way feed to factories for emergency back-up. Then a possible "clash" of two rotation systems can cause serious problems.

You cannot examine rotation direction until you are sure you have a standard method of identifying which phase you call one or two or three, for every design of equipment your customer will encounter.

In the US, a convention from NEMA is top to bottom, front to back, left to right 1-2-3 when looking at the front, all of these terms are relative and need to be defined in excruciating detail, otherwise the concept of phase rotation is meaningless.