What is the difference between a single-phase electricity meter and a three-phase electricity meter, and what are their different uses?

1. Difference in scope of application: Three-phase electricity meters are suitable for small and medium-sized merchants, distribution networks, industrial and mining enterprises, public facilities, civil buildings, etc. Single-phase electricity meters are suitable for local fee-controlled residential users and rental users.

2. Differences in accuracy levels: The accuracy levels of three-phase electricity meters are level 1, level 0.5s, and level 0.2s. The accuracy levels of single-phase electricity meters are level 1 and level 2. Single-phase electricity meters can only achieve level 1 accuracy at most, but three-phase electricity meters can achieve level 0.5s and level 0.2s.

3. Reference voltage difference: Three-phase ammeter has many voltage specifications: 3*220/380V 3*57.7/100V. Single-phase ammeters generally have only one voltage specification, which is 220V.

Extended information:

Notes:

1. Before the equipment is powered on and used, it should be reliably grounded.

2. Before powering on the equipment, you should confirm the state of the Ua/external power supply selection switch on the panel: pressing this switch selects the equipment operating power supply through Ua and U0, and the power supply range It is AC80V-400V. In this state, it is strictly prohibited to plug the power cord into an external 220V socket.

3. It is strictly prohibited to press the Ua/external power supply selection switch repeatedly when the equipment is powered on and working.

4. It is strictly prohibited to touch the terminals on the panel with your hands when the equipment is powered on and working.

5. Connect the test leads correctly, set the current input method correctly, and input the current and voltage within the corresponding limits. Remember that the current input value must not exceed 120% of the selected terminal rating.