Auto load limiter reverse power problem
The MT4W appears to be a ammeter/voltmeter.

It is not intended to be operated as a power meter.

It is not intended to be used for reverse power protection.

This function would normally be implemented on a protection relay. You should check your existing protection relays to see if they have a power / reverse power element already. If not, you will need some new equipment.

The SEL-751A is an example of a relay including directional power elements (ANSI 32). Budgetary price for this relay is $950 USD so it need not be expensive.

You will require both current and voltage inputs. This means you will need to install VT's if you don't already have them.

Detailed design and installation of this equipment should be done by people who are trained, deemed competent, and authorised to design and work with HV equipment in your country.