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

互感器第14部分：直流电流互感器的补充技术要求

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 14, 2022

Implementation date

May 1, 2023

Scope

GB/T 20840.14-2022 is the English-translated version of 互感器第14部分：直流电流互感器的补充技术要求.

GB/T 20840.14-2022 is the Chinese standard "Instrument transformers - Part 14: Additional requirements for current transformers for DC applications".

Its scope clause reads: This document specifies the terminology for a DC current transformer (DCCT) whose output signal can be analog or digital using any technology and all supplementary technical requirements for definitions, ratings, design and construction, testing, etc. This document applies to newly manufactured current transformers for measurement, protection and/or control in DC power systems with rated voltages greater than 1.5kV sensor.

Note 1.Figure 601 of GB/T 20840.6-2017 describes the general configuration of single-pole low-power transformers. This document does not apply to DCCTs used for current measurements on the VSC valve transistor branch (referred to in Figure 1403 and Table 1402 CT4a and CT4b).

Note 2.This will be considered in future revisions. Its clauses include terms and definitions.

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Document preview — GB/T 20840.14-2022

National Standard of the People's Republic of China

ICS: 29.180
Classification: K 41

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
5 Rating
6 Design and Structure
7 Test

1 Scope

This document specifies the terminology for a DC current transformer (DCCT) whose output signal can be analog or digital using any technology and all supplementary technical requirements for definitions, ratings, design and construction, testing, etc.

This document applies to newly manufactured current transformers for measurement, protection and/or control in DC power systems with rated voltages greater than 1.5kV sensor.

Note 1.Figure 601 of GB/T 20840.6-2017 describes the general configuration of single-pole low-power transformers.

This document does not apply to DCCTs used for current measurements on the VSC valve transistor branch (referred to in Figure 1403 and Table 1402

CT4a and CT4b).

Note 2.This will be considered in future revisions.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

Chapter 2 of GB/T 20840.6-2017 and the following supplementary content are applicable.

GB/T 2423.3 Environmental Test Part 2.Test Method Test Cab. Constant Damp Heat Test (GB/T 2423.3-

2016, IEC 60068-2-78.2012, IDT)

GB/T 3954 Electrician round aluminum rod

GB/T 5585.1 Copper, aluminum and their alloy busbars for electricians - Part 1.Copper and copper alloy busbars

GB/T 20840.6-2017 Transformers Part 6.Supplementary general technical requirements for low power transformers (IEC 61869-6.

2016, MOD)

GB/T 20840.8-2007 Transformers Part 8.Electronic Current Transformers (IEC 60044-8.2002, MOD)

GB/T 20840.9-2017 Transformer Part 9.Digital Interface of Transformer (IEC 61869-9.2016, MOD)

GB/T 26218.4-2019 Selection and dimensioning of high-voltage insulators used in dirty conditions - Part 4.For DC systems insulator

3 Terms and Definitions

Chapter 3 of GB/T 20840.1-2010, Chapter 3 of GB/T 20840.6-2017 and Chapter 3 of GB/T 20840.9-2017

The defined terms and definitions, as well as the following additions and modifications, apply to this document.

GB/T 19212.5 | GB/T 10228 | GB/T 8286 | GB/T 20840.11 | GB/T 20840.10 | GB/T 20840.15 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 77 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60068 · IEC 61869 · IEC 60044

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