GB/T 45119-2024Technical requirements for insulation monitoring of low voltage power supply systems in power plants and substations (English PDF)

电力厂站低压用电系统的绝缘监测技术要求

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2024

Implementation date

July 1, 2025

Scope

GB/T 45119-2024 is the English-translated version of 电力厂站低压用电系统的绝缘监测技术要求.

GB/T 45119-2024 sets the technical requirements for insulation monitoring in the low voltage systems of power plants and substations. Those systems are unearthed on purpose: an IT system keeps running through a first earth fault instead of tripping, which is exactly what is wanted for the auxiliaries and the DC supplies a station depends on. The price of that choice is that the first fault is invisible unless something watches for it, and a second fault on another phase is a short circuit. This document specifies what that watching device has to do: the requirements on the insulation monitoring device and on the fault location system, the measurement principle and the accuracy, the response time, the alarm thresholds and the behaviour on alarm, the requirements on the coupling to the system and the effect of system capacitance, the immunity and environmental requirements, the interfaces to the station monitoring system, and the test methods. For a station designer, an operator or a supplier of insulation monitoring equipment in China, this is the specification.

Document preview — GB/T 45119-2024

National Standard of the People's Republic of China

ICS: 29.080
Classification: K 80

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Basic Requirements2
4.1 Working Environment2
4.2 Electrical performance3
4.3 Communications and others4
5 Monitoring requirements4
5.1 Classification4
5.2 Functional indicators4
5.3 Main methods7
6 Installation Acceptance8
6.1 Inspection8
6.2 Layout10
6.3 Acceptance10
7 Operation and Maintenance12
7.1 Run12
19 Reference23

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. 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 was proposed and coordinated by the National Power System Plant Low Voltage Electricity Standardization Working Group (SAC/SWG21). This document was drafted by: State Grid Sichuan Electric Power Company Electric Power Research Institute, Guangdong Qianshun Technology Co., Ltd., Zhejiang Kechang Electronics Co., Ltd. Co., Ltd., State Grid Jibei Electric Power Co., Ltd. Electric Power Research Institute, Shenzhen Aotexun Electric Power Equipment Co., Ltd., State Grid Sichuan Province Power Company, State Grid Chongqing Power Company, Shourui (Tianjin) Electrical Equipment Co., Ltd., Zhiyang Innovation Technology Co., Ltd., State Grid Sichuan Integrated Energy Services Co., Ltd., Hebei Chuangke Electronic Technology Co., Ltd., China Datang Corporation Science and Technology Research Institute Co., Ltd., East China Electric Power Testing Institute, State Grid Hebei Electric Power Co., Ltd. Electric Power Science Research Institute, Dalian Lushun Power Electronic Equipment Co., Ltd., State Grid Tian Tianjin Electric Power Company, State Power Investment Corporation Science and Technology Research Institute Co., Ltd., China Southern Power Grid Research Institute Co., Ltd., Shenzhen Power Supply State Grid Corporation of China, State Grid Jibei Electric Power Co., Ltd., State Grid Liaoning Electric Power Co., Ltd. Electric Power Research Institute, Shenzhen Taiang Energy Technology Co., Ltd., Guangzhou Youwei Electronic Technology Co., Ltd., and Xuji Power Supply Co., Ltd. The main drafters of this document are. Luo Yang, Li Jing, Dong Hanbin, Fang Yuan, Xu Yufeng, Wang Fengren, Tian Jinhu, Zhang Chao, Fan Songhai, Li Shuqi, Yang Jing, Chen Shuxin, Chen Ying, Wu Chi, Ma Xiaomin, Ma Xinsheng, Nan Yin, Wang Jiayi, Nie Shugang, Li Yongxiang, Ma Yanqiang, Zhou Guangyuan, Wang Xuenan, Zhao Miao, Li Bingyu, Miao Shuguo, Zhao Jun, Liu Qin, Luo Wenke, Li Lijun, Wu Feifei, Xu Guangda, Yang Zhongliang, Wang Hong, Wang Yingming, Zhang Wanzheng, Liu Zhongxiang, Zhao Yinglong, Bao Chunfei, Luo Zhijun, Zheng Guoyong. Insulation monitoring of low voltage power systems in power plants Technical requirements

1 Scope

This document specifies the basic requirements, monitoring requirements, installation acceptance and operation and maintenance of low-voltage power systems in power plants and stations. Require. This document is applicable to the design, selection and installation of insulation monitoring of low voltage AC and DC power systems in power projects such as power plants, substations and converter stations. and use.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 2423.1-2008 Environmental testing for electric and electronic products Part

3 Terms and definitions

The terms and definitions defined in GB/T 2900.1, GB/T 2900.33, GB/T 4365 and the following apply to this document.

3.1 Insulation monitoring insulationmonitoring Monitor and measure the insulation condition of busbars and branches to ground in low voltage AC and DC power supply systems.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 2900.1Electrotechnical terminology - Fundamental terms

GB/T 2423.1-2008 · GB/T 2423.2-2008 · GB/T 2423.5-2019 · GB/T 2423.10-2019 · GB/T 2900.33 · GB/T 4365 · GB/T 17626.2 · GB/T 17626.3

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