GB/T 20840.14-2022
Instrument transformers—Part 14：Additional requirements for current transformers for DC applications (English Version)

Standard No.: GB/T 20840.14-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 20840.14-2022

Scope: This document specifies the terms and definitions, ratings, design and construction, tests, etc. of DC current transformers (DCCT), whose output signals can be analog or digital, using any technology, and all supplementary technical requirements. This document applies to newly manufactured current transformers for measurement, protection and/or control in direct current power systems with a rated voltage greater than 1,5 kV. Note 1: Figure 601 of GB/T20840.6-2017 describes the general configuration of single-pole low-power transformers. This document does not apply to DCCTs (referred to as CT4a and CT4b in Figure 1403 and Table 1402) used for current measurement on VSC valve transistor legs. Note 2: This will be considered in future revisions.

GB/T 20840.14-2022 Referenced Document

GB/T 20840.6-2017 Instrument transformers—Part 6:Additional general requirements for low-power instrument transformers
GB/T 20840.8-2007 Instrument transformers Part 8: Electronic current transformers
GB/T 20840.9-2017 Instrument transformers—Part 9:Digital interface for instruments transformers
GB/T 26218.4-2019 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions—Part 4: Insulators for d.c. systems
GB/T 3954 Aluminium and aluminium alloys rod for electrical purpose*， 2022-12-30 Update
GB/T 5585.1 Copper or aluminium and its alloy bus bars for electrical purposes—Part 1: Copper and copper alloy bus bars

2022 GB/T 20840.14-2022 Instrument transformers—Part 14：Additional requirements for current transformers for DC applications