GB/T 33708.1-2025Electrictity metering equipment(DC) - Part 1: General requirements (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 1 of GB/T 33708 "Dual Current Energy Measurement Equipment". GB/T 33708 has the following parts published.

---Part 1: General Requirements;

---Part 2: Indirect connection to static energy meters (Class 0.2, Class 0.5 and Class 1).

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Machinery Industry Federation.

This document is under the jurisdiction of the National Technical Committee on Standardization of Electrical Instruments and Meters (SAC/TC104).

Introduction

GB/T 33708 "DC Power Measurement Equipment" aims to specify the general requirements, tests and test conditions for DC power measurement equipment.

GB/T 33708 is proposed to consist of the following parts.

---Part 1: General Requirements. The purpose is to specify the general requirements and related tests and type test conditions for DC energy meters.

---Part 2: Indirect Connection to Static Energy Meters (Class 0.2, 0.5, and 1). The purpose is to specify the requirements for newly manufactured meters with direct current...

Indirect access static DC power for measuring and controlling DC power in the network, with accuracy classes of 0.2, 0.5, and 1.

The type test requirements and test methods for the table.

---Part 3: Direct Connection to Static Energy Meters (Class 0.5 and Class 1). The purpose is to specify the requirements for newly manufactured meters for measuring energy in DC power grids.

Type test requirements for direct-connection static energy meters that measure and control DC power with accuracy classes of 0.5 and 1.

and its experimental methods.

---Part 4: Digital Static DC Energy Meters. The purpose is to specify the calculation methods for newly manufactured digital static DC energy meters.

Quantitative performance, influence quantity requirements, and type testing, etc.

This document is intended to be used in conjunction with other parts of GB/T 33708.

This document outlines the minimum test levels required to ensure proper instrument function under normal operating conditions; other requirements may apply to special application scenarios.

The testing level is agreed upon by the user and the manufacturer.

The technical requirements applicable to DC power measurement equipment in IEC 62052-11:2020 are extracted and combined.

Other general technical requirements are incorporated into this document.

DC power measurement equipment - Part 1: General requirements

1 Scope

This document specifies the general requirements and related tests, as well as type test conditions, for DC power measurement equipment (hereinafter referred to as "instruments").

The test includes functional requirements, mechanical requirements, electrical requirements, safety requirements, labeling requirements, and immunity to external influences such as electromagnetic and climatic environments.

Test methods and test conditions.

Note 1.For specific accuracy requirements and other special requirements of instruments of each accuracy class, see the Special Requirements section of GB/T 33708.

Note 2.For other general requirements, such as the metering methods and requirements for multi-energy and multi-rate meters, reliability, etc., please refer to GB/T 17215.241-2025 or Relevant parts of GB/T 17215.9.

This document applies to.

---Instruments for measuring and controlling electrical energy in electrical networks with a voltage not exceeding 1500V;

Note 3.For instruments indirectly connected via a DC sensor (such as a voltage divider), if the sensor's rated input voltage is greater than 1500V, only the measuring device will be affected.

It is considered a low-voltage measuring device, but the combined device consisting of its DC sensor and measuring equipment is not considered a low-voltage measuring device.

---Except for the indicator display, all functional units (including additional modules) are encapsulated in the same case or form a separate case.

meter;

---Meters using integrated displays;

---Meters using separate indicator displays or without indicator displays;

---Instruments installed on matching sockets or racks;

---Instruments that provide additional functions besides power measurement are not covered in this document.

This document also applies to auxiliary input and output circuits, operating indicators, and test outputs of measuring equipment.

Note 4.For example. pulse input and output, control input and output, power test output.

This document also covers general requirements for accuracy testing, such as reference conditions, measurement repeatability, and measurement uncertainty.

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 rail locomotives, vehicles, ships, and aircraft;

---Laboratory and instrument 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.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.