wrong calculation of active power

My meter equipment shows less power than the system, parameters and connections were checked and everything was correct, the current and voltage parameters are correct but the power parameter is wrong, what could happen?

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Hi,

I think the most possible reason is the phase mismatch in installation.

Power up the energy meter by one phase voltage but clamp the CT to the wire of another phase.

Like this https://www.iammeter.com/newsshow/blog-meter-accuracy#phase-mismatch-in-installation

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