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GB/T 18891-2024: Designation of phase differences by hour numbers in three-phase AC systems
Status: Valid GB/T 18891: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 18891-2024 | English | 194 |
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Designation of phase differences by hour numbers in three-phase AC systems
| Valid |
GB/T 18891-2024
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| GB/T 18891-2009 | English | 319 |
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Identification by hour numbers of the phase conductors of 3-phase electric systems
| Obsolete |
GB/T 18891-2009
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| GB/T 18891-2002 | English | 199 |
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The three-phase power system phase conductor identifies the number of clock timing
| Obsolete |
GB/T 18891-2002
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PDF similar to GB/T 18891-2024
Basic data | Standard ID | GB/T 18891-2024 (GB/T18891-2024) | | Description (Translated English) | Designation of phase differences by hour numbers in three-phase AC systems | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K09 | | Classification of International Standard | 29.020 | | Word Count Estimation | 10,146 | | Date of Issue | 2024-04-25 | | Date of Implementation | 2024-11-01 | | Older Standard (superseded by this standard) | GB/T 18891-2009 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 18891-2024: Designation of phase differences by hour numbers in three-phase AC systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29:020
CCSK09
National Standards of People's Republic of China
Replace GB/T 18891-2009
Clock sequence number identification of phase difference in three-phase AC system
(IEC 60152:2021, IDT)
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 clock time number 1
5 Phase difference 1
References 3
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document replaces GB/T 18891-2009 "Clock timing number identification of phase conductors in three-phase power systems" and is consistent with GB/T 18891-2009:
In addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) The scope of application has been changed (see Chapter 1, Chapter 1 of the:2009 edition);
b) Added a chapter on “Terms and Definitions” (see Chapter 3);
c) Deleted "Application", "Basic points for compiling clock and time sequence numbers", and "Position of marking clock and time sequence numbers" (see Chapter 2,
Chapter 3, Chapter 4);
d) Added a chapter on "Clock Sequence Numbers" (see Chapter 4);
e) Added a chapter on “Phase Difference” (see Chapter 5):
This document is equivalent to IEC 60152:2021 "Clock timing number identification of phase differences in three-phase AC systems":
The following minimal editorial changes were made to this document:
---Added references:
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document is proposed and coordinated by the National Electrical Safety Standardization Technical Committee (SAC/TC25):
This document was drafted by: Jiaxing Power Supply Company of State Grid Zhejiang Electric Power Co:, Ltd:, Guangdong Product Quality Supervision and Inspection Institute, Guangzhou Bai
Yun Electric Equipment Co:, Ltd:, State Grid Beijing Electric Power Company, Tianjin Pinggao Intelligent Electric Co:, Ltd:, Beijing Electric Technology Co:, Ltd: of Machinery Industry
Economic Research Institute, State Grid Zhejiang Electric Power Co:, Ltd: Hangzhou Qiantang District Power Supply Company, State Grid Shaanxi Electric Power Co:, Ltd:, Zhongshan Shenzhong
Standard Quality Research Center, Guangdong South China Household Appliances Research Institute, China Electrical Equipment Industry Association, Guangdong Zhengcheng Electric Technology Co:, Ltd:, Hangzhou Zhijiang Kai
Guan Co:, Ltd:, State Grid Hunan Electric Power Co:, Ltd: Economic and Technological Research Institute, Guang'an Electric Testing Center (Guangdong) Co:, Ltd:, Guangdong
ZUOXIANG TECHNOLOGY CO:, LTD:
The main drafters of this document are: Ma Guifen, Qian Weijie, Zeng Binhua, Song Xinyu, Ren Yunying, Ma Hong, Yu Danqi, Xing Wei, Ou Huimin, Lai Jing,
Zeng Yanhong, Yu Huoqing, Zhang Liying, Liu Wenjun, Jiang Cheng, Fang Jinghui, Zhang Shaojian, Hao Zhigang, Luo Haiao, Cui Peng, Pan Yifan, Zhou Min, Peng Maojun:
The previous versions of this document and the documents it replaces are as follows:
---First published as GB/T 18891-2002 in:2002 and first revised in:2009;
---This is the second revision:
Clock sequence number identification of phase difference in three-phase AC system
1 Scope
This document specifies the method and rules for identifying the phase difference between the two in a three-phase AC system:
This document applies to the technical documentation of industrial plants, equipment and products, as well as the marking of equipment and products:
2 Normative references
This document has no normative references:
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
hournumber
Hours clocknumber
Used to identify the phase difference of the same amount between two in an AC system:
3:2
Phase difference
For two sinusoidal quantities with the same frequency given in a given order, their initial phase difference may be added to some integer of 2π:
multiples so that the difference is greater than -π and less than or equal to π:
Note: For two quantities a'(t)=A^'cos(ωt θ'0) and a″(t)=A^″cos(ωt θ″0), their phase difference is φ=θ″0-θ'0 2πn, where n
is an integer such that -π< φ≤π:
[Source: GB/T 2900:92-2015, 103-07-06]
4-hour clock
For the identification of phase differences in a three-phase AC system, the following clock sequence numbers may be used: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11:
Each clock timing number should represent a corresponding multiple of the 30° phase difference:
Example 1: The clock timing number 3 indicates a phase difference of 90°:
Example 2: The clock timing number 5 indicates a phase difference of 150°:
5 Phase difference
When identifying the phase difference between two quantities, the clock sequence number should indicate the corresponding degree by which the second quantity lags behind the first:
Example 1: To represent the phase difference between line conductors L1 and L2 in a three-phase power transmission system, the clock digit 4 can represent a phase difference of 120°:
When indicating the same amount of phase difference between the in-phase input side and the output side, the clock timing number should indicate how much the output side lags behind the input side:
Less degree:
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