GB/T 33708.2-2025Electricity metering equipment (DC) - Part 2: Indirect-connected static meters (classes 0.2, 0.5 and 1) (English PDF)

GB/T 33708.2-2025 is the English-translated version of 直流电能测量设备　第2部分：间接接入静止式电能表（0.2级、0.5级和1级）.

GB/T 33708.2-2025 is the Chinese standard "Electricity metering equipment (DC) - Part 2: Indirect-connected static meters (classes 0.2, 0.5 and 1)". Its scope clause reads: This document specifies newly manufactured indirect current measuring devices for measuring DC power in a DC power grid, with accuracy classes of 0.2, 0.5, and 1.

Type test requirements and test methods for connected static DC energy meters (hereinafter referred to as "meters"). Note 1.Indirect access instruments include two types. voltage and current indirect access and current indirect access.

Note 2.The instruments covered in this document are used to measure DC power in the following fields or similar applications. ---In electric vehicle (EV) charging stations or EV charging infrastructure (e.g., when measured on the DC side); ---In the information technology (IT) server cluster group; ---In low-voltage DC networks in residential or commercial areas (e.g., when measured on the DC side); ---In solar photovoltaic (PV) systems that measure DC power generation; ---DC power supply point for public transportation networks (such as trolleybuses).

This document applies to the following electrical energy measuring equipment. ---A device for measuring and controlling DC power with a voltage not exceeding 1500V; Note 3.For instruments indirectly connected via a DC sensor (voltage divider), if the rated input voltage of the voltage divider is greater than 1500V, only the measuring device is considered as such.

Low-voltage measuring equipment, including combined devices consisting of DC sensors and measuring equipment, is not considered low-voltage measuring equipment. ---Use integrated or separate indicator displays, or meters without indicator displays; ---Except for the indicator display, all functional units (including additional modules) are encapsulated within the same watch case or form a separate watch case. meter; ---Instruments installed on matching sockets or racks. ---Electrical energy measurement is a mandatory function of the instrument, with additional functions being optional.

Note 4.Additional functions typically included in electricity meters include voltage, current, power, power quality parameter measurement, and measurement of other forms of electricity such as water, gas, and heat.

Parameter measurement interface and load control, communication data interface. Requirements for these functions are not covered in this document.

This document does not apply to. ---Instruments with a nominal voltage exceeding 1500V; ---Electromechanical instruments; ---Portable instrument; Note 5.Portable instruments refer to instruments that are not permanently connected. ---Instruments used in locomotives, rolling stock, ships, and aircraft; ---Laboratory and instrumentation testing equipment; ---DC standard energy meter; ---Data interface for instrument registers; ---A matching socket or rack for mounting instruments; --- Additional features provided in the instrument.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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