Electronic energy meters are primarily classified according to their phase configuration and functionality. Based on phase configuration, the main categories are single-phase electronic energy meters and three-phase electronic energy meters. Based on functionality, they include standard metering types, prepaid types (e.g., models DDSY8118 and DDSY422), and multi-functional types (which can measure both forward/reverse active and reactive energy, and feature capabilities such as event recording and communication) .
Common single-phase standard metering electronic energy meters include models such as the DDS870, DDS480, DDS237-1, and DDS110 [9-10] [15]. The performance of the DDS870 model complies with the GB/T17215-2002 standard; the DDS480 model also complies with the GB/T17215-2002 standard; and the DDS237-1 model complies with the GB/T17215.321-2008 standard. Their key parameters include basic current ratings (e.g., 1.5(6)A, 5(60)A), a reference voltage of 220V, accuracy classes (Class 1.0, Class 2), and a frequency of 50Hz/60Hz.
Single-phase prepaid electronic energy meters primarily include models such as the DDSY422 and DDSY8118. The DDSY422 model is designed for time-of-use (TOU) metering of AC active energy in single-phase power grids, as well as remote tariff control; it complies with standards such as DL/T645-2007, features a current specification of 5(60)A, and belongs to accuracy Class 1.0.
Certain models support additional features such as anti-tampering capabilities, high overload capacity (e.g., exceeding 10 times the rated current), and the use of LCD or mechanical register displays .