Current limiting for reverse power flow in smart meters with current limiting function

Starting in March 2016, we began installing smart meters with bidirectional metering capabilities that measure the amount of electricity supplied and the amount of electricity purchased (received) in cases where solar Power generation equipment etc. have been installed and a low-voltage supply-receive contract has been concluded.

In this regard, we would like to inform you as follows about the current limit for reverse power flow when a bidirectional smart meter with a current limiting function is installed.

Traditionally, when installing solar Power generation equipment, etc., the ACL is designed to operate even in the case of reverse power flow, so in many cases the supply and demand Contracted Electricity Capacity has been determined based on the capacity of the solar Power generation equipment, etc.

 

The newly introduced smart meters with current limiting and bidirectional metering functions are designed so that they do not limit current due to reverse power flow, so there is no need to take the capacity of solar Power generation equipment, etc. into consideration when determining the supply and demand Contracted Electricity Capacity.

• The meter capacity of smart meters with current limiting and bidirectional metering functions is 60A only.
• If Power generation equipment capacity exceeds 12kW, a smart meter with a bidirectional metering function of 120A or more will be installed, so the smart meter will not be able to limit the current.