IEEE 2752-2023

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IEEE Guide for Multi-Point Grounding System of Trains in Electrified Railway (Approved Draft)

Published By	Publication Date	Number of Pages
IEEE	2023

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Description

New IEEE Standard – Active. Multi-point mobile grounding system plays a critical role in providing safer power supply for electrified railway as the unique pathway of traction power reflux. The multi-point mobile grounding system of electrified railway contains two types of grounding modes–working grounding and protective grounding. However, along with the traction power increasing, it is possible that the traction current discharged by the working grounding flows through the neighboring protective grounding points and back to the vehicle bodies. This vehicle body (VB) current may flee through other protective grounding points back to the rail again during the dynamic process of the vehicles, forming as the current reflux phenomenon. This VB current reflux may directly result in thermal surge in the partial part of train bodies, or cause the contact potential of vehicle bodies, which may interfere or even burn the low-voltage control systems or on-board sensors. Apart from threatening the on-board equipment, the uneven distribution of reflux locating at each wheel set of carriage may also result in the erosion of the isolated joint of rail or even shorten the life span of carbon brush contacting with the axles of grounding wheels. The design and requirement of grounding system for vehicles operation in electrified railway is applied in this guide.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std 2752™-2023 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
12	1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage 2. Normative references
13	3. Definitions, acronyms, and abbreviations 3.1 Multi-point mobile grounding system 3.2 Voltage and current
14	3.3 Other definitions 4. General 4.1 The indices of evaluating the performance of the grounding system for electrified train 4.2 The constitution of grounding system
19	4.3 Technical requirements for grounding system
20	4.4 Related factors to be considered in the design of grounding system 5. Grounding scheme 5.1 General requirements 5.2 Requirements of grounding conductors
21	5.3 Equipotential connection method between vehicle bodies 5.4 Typical grounding design scheme
24	6. Grounding performance measurement and evaluation 6.1 Typical grounding design scheme 6.2 Voltage parameter measurement and evaluation scheme
26	6.3 Current parameter measurement and evaluation scheme
28	Back cover