Single-phase active energy meter wiring with current transformer

The diagram shown above is the jump A type wiring method. Its characteristic is that terminals 1 and 3 of the electric energy meter are connected to the power supply, and terminals 2 and 4 are connected to the load
. Shown is slide-in wiring. Its characteristic is that the terminal numbers of the electric energy meter are connected in sequence, that is, terminals 1 and 2 are connected to the power supply and terminals
3 and 4 are connected to the load. When the current in the circuit under test is very large and the rated current of the electric energy meter cannot meet the measurement requirements, the method of distributing a current transformer can be used for measurement. The wiring of single-phase active energy meter with current transformer is shown in Figure 15-11. At this time, the current coil of the electric energy meter is no longer in series with the load circuit, but is connected to the secondary winding of the current transformer. The primary winding of the current transformer is the load line (power line) being measured . Special attention should be paid to the fact that the same terminals of the two windings of the current transformer and the same terminals of the two coils of the electric energy meter cannot be connected incorrectly , otherwise the electric energy meter may reverse.