Fill in the gaps! CES Group Standard Technical Specification for Latent Fault Monitoring Device for High Voltage AC Circuit Breaker

The group standard T/CES 267-2023 "Technical Specification for Latent Fault Monitoring Device for High-Voltage AC Circuit Breakers" of the China Electrotechnical Society was proposed by the China Electrotechnical Society and drafted and compiled by the Nanjing Power Supply Branch of State Grid Jiangsu Electric Power Co., Ltd. and other units. The standard stipulates the technical requirements for the composition and monitoring methods, test methods, and inspection rules of the latent fault monitoring device of the high-voltage AC circuit breaker.

1. Standard drafting unit and main drafter

(1) Drafting unit

State Grid Jiangsu Electric Power Co., Ltd. Nanjing Power Supply Branch, Xuchang Kaipu Electric Research Institute Co., Ltd., Nanjing University of Posts and Telecommunications, State Grid Electric Power Research Institute Co., Ltd., State Grid Ningxia Electric Power Co., Ltd. Economic and Technological Research Institute, State Grid Jibei Electric Power Co., Ltd. Power Dispatching and Control Center, State Grid Hunan Electric Power Company Electric Power Research Institute, etc.

(2) The main drafter

Chen Hao, Hu Xiaojing, Shi Tao, Zhou Yongrong, Dang Dongsheng, Ma Yingxin, Wu Jinbo, Tang Yi, Shi Hengchu, Chu Yang, Wang Wenlin, He Xiaorui, Zhang Feng, Xu Hongyuan, Wang Yafeng, Shi Xiaofeng, etc.

2. Background of standard development

The latent fault monitoring device of high-voltage AC circuit breaker can timely detect the fault of high-voltage AC circuit breaker in the incubation period, avoid the large power outage accident caused by the fault of the AC circuit breaker body, and improve the safety level of power supply. There are no relevant standards and specifications for the composition and monitoring methods, technical requirements, test methods and inspection rules of latent fault monitoring devices for high-voltage AC circuit breakers.

The formulation of this standard fills the gap in the technical standard system for latent fault monitoring of high-voltage AC circuit breakers, and provides support for standardizing the adaptability of latent fault monitoring technology of high-voltage AC circuit breakers.

3. The main content of the standard

(1) Scope

This standard stipulates the technical requirements for the composition and monitoring methods, test methods, and inspection rules of the latent fault monitoring device of the high-voltage AC circuit breaker.

This standard is applicable to the design, manufacture, test, selection and operation of latent fault monitoring devices for high-voltage AC open circuit breakers of 10kV and above.

(2) Normative references

The main documents cited in this standard mainly include:

• GB/T 191 Pictorial Signs for Packaging, Storage and Transportation
• GB/T 2423.1 Environmental test for electrical and electronic products Part 2: Test method Test A: Low temperature
• GB/T 2423.2 Environmental tests for electrical and electronic products Part 2: Test methods Test B: High temperature
• GB/T 2423.4 Environmental tests for electrical and electronic products – Part 2: Test methods – Test Db: Alternating damp heat (12h+12h cycle)
• GB/T 2900.50 Electrical terminology -- Generation, transmission and distribution -- General terms
• GB/T 4208—2017 Enclosure protection level (IP code)
• GB/T 4798.2 Classification of environmental conditions Classification of environmental parameter groups and classification of their severity Part 2: Transport and handling
• GB/T 11287 Electrical relays – Part 21: Measuring vibration, shock, collision and seismic tests of relays and protective devices – Part 1: Vibration tests (sinusoidal)
• GB/T 13384 General technical conditions for the packaging of mechanical and electrical products
• GB 14287.1—2014 Electrical fire monitoring system Part 1: Electrical fire monitoring equipment
• GB 14287.2—2014 Electrical fire monitoring system Part 2: Residual current electrical fire monitoring detectors
• GB/T 14537 Measurement of shock and crash tests of relays and protective devices
• GB/T 14598.2—2011 Measuring relays and protective devices – Part 1: General requirements
• GB/T 14598.27 Measuring relays and protective devices – Part 27: Product safety requirements
• GB/T 17626.2—2018 Electromagnetic compatibility -- Test and measurement technology -- Electrostatic discharge immunity test
• GB/T 17626.3—2016 Electromagnetic compatibility -- Test and measurement technology -- Radio frequency electromagnetic field radiation immunity test
• GB/T 17626.4—2018 Electromagnetic compatibility -- Test and measurement techniques -- Electrical fast transient burst immunity test
• GB/T 17626.5—2019 Electromagnetic compatibility -- Test and measurement technology -- Surge (shock) immunity test
• GB/T 17626.6—2017 Electromagnetic compatibility -- Test and measurement techniques -- Immunity to conducted disturbance induced by radio frequency field
• GB/T 17626.8—2006 Electromagnetic compatibility -- Test and measurement technology -- Power frequency magnetic field immunity test
• GB/T 17626.9—2011 Electromagnetic compatibility -- Test and measurement technology -- Pulsed magnetic field immunity test
• GB/T 17626.10—2017 Electromagnetic compatibility -- Test and measurement technology -- Damped oscillation magnetic field immunity test
• GB/T 17626.11—2023 Electromagnetic compatibility -- Test and measurement techniques -- Immunity test for voltage sags, short-term interruptions, and voltage changes
• GB/T 17626.18—2016 Electromagnetic compatibility -- Test and measurement techniques -- Immunity test of damped oscillating waves
• GB/T 18459—2001 Calculation method for main static performance indicators of sensors
• DL/T 860 (all parts) Substation communication networks and systems
• DL/T 1498.1—2016 Technical specification for on-line monitoring device for substation equipment Part 1: General principles
• NB/T 10680 Technical Guidelines for Information Security of Relay Protection and Safety Robots

(3) Terms and Definitions

It mainly includes the definition of latent fault of circuit breaker and latent fault monitoring device of high-voltage AC circuit breaker.

(4) Abbreviations (omitted)

(5) Device monitoring function requirements

The latent fault detection capabilities of circuit breakers such as mechanical, insulation, and secondary circuits of 10kV and above that the device should have are standardized.

(6) The composition of the device

The constituent units consisting of the whole device, the submachine of the device and the host of the high-rise device, as well as the functional modules that should be possessed inside each constituent unit are standardized.

(7) Technical requirements for the device submachine

The working conditions, general requirements, structure and component requirements, sensor installation requirements, functional requirements and performance requirements that should be met by the device submachine are standardized.

(8) Technical requirements for the host of the device

The working conditions, general requirements, structure and component requirements, functional requirements and performance requirements that should be met by the main machine of the device are standardized.

(9) Test method of device submachine

The methods and requirements for general inspection, protection level test, basic function test, timing function test, device fault alarm function test, measurement accuracy test, communication function test, electrical insulation performance test, electromagnetic compatibility performance test, environmental adaptability test, mechanical performance test, residual current sensor balance test, high current short-time withstand test and leakage current test are mainly proposed.

(10) Test method of the main engine of the device

The methods and requirements of the fault diagnosis function test, the display and query function test and the fault display function test of the device submachine for the device host are mainly proposed.

(11) Inspection rules

The general requirements for device inspection are proposed, and the specific test items and technical requirements for type test, factory test, handover test and on-site test are standardized.

(12) Marking, packaging, transportation and storage

The requirements for marking, packaging, transportation and storage of the device are regulated.

(13) Information and spare parts supplied with the device (omitted)

(14) Appendix A (Informational) Device Handset Deployment Methods

The deployment mode of the device submachine and its sensor of a typical circuit breaker is proposed for reference, and the key points of the operation method and construction technology method of the on-site installation of the device are given.

(15) Appendix B (normative) device handset fault identification method

The identification method and recommended parameter threshold for latent faults of mechanical machinery, latent faults of external insulation and latent faults of secondary circuits are proposed.

(16) Appendix C (informative): A quantitative assessment method of health based on the expert database

The specific principles and methods of the fault diagnosis function of the device host expert database are given, including the short-term and long-term health calculation method of the circuit breaker, the health status assessment steps, the health assessment result partitioning, and the quantitative rating of the maintenance and debugging strategy based on the health assessment.

(17) Appendix D (Normative) Test method for fault monitoring function of device submachine

The implementation steps of the fault monitoring function test method of the device submachine are proposed, and the test items include direct measurement of residual current, residual current synthesis measurement, synchronization error test of current acquisition by multiple residual current sensors, vibration signal measurement, and electric field strength measurement.

4. Standard-setting benefits

This standard has a wide applicability. The formulation of this standard will further improve the continental standard system, and then provide technical specifications for the monitoring and quantitative evaluation of latent faults of high-voltage AC circuit breakers in substations.

After the issuance and implementation of this standard, it will help promote the scientific planning and reasonable layout of the latent fault monitoring device of the high-voltage AC circuit breaker in the substation, ensure the demand for a significant increase in the number of circuit breakers in the new energy grid-connected environment, give full play to the health status perception and fault early warning capabilities of the latent fault device of the high-voltage AC circuit breaker, and improve the intelligent operation and maintenance level of the equipment of the mainland substation.