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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | IEEE Std 2752\u2122-2023 Front cover <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Title page <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Important Notices and Disclaimers Concerning IEEE Standards Documents <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Participants <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1.\u2002Overview 1.1\u2002Scope 1.2\u2002Purpose 1.3\u2002Word usage 2.\u2002Normative references <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.\u2002Definitions, acronyms, and abbreviations 3.1\u2002Multi-point mobile grounding system 3.2\u2002Voltage and current <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.3\u2002Other definitions 4.\u2002General 4.1\u2002The indices of evaluating the performance of the grounding system for electrified train 4.2\u2002The constitution of grounding system <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.3\u2002Technical requirements for grounding system <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.4\u2002Related factors to be considered in the design of grounding system 5.\u2002Grounding scheme 5.1\u2002General requirements 5.2\u2002Requirements of grounding conductors <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 5.3\u2002Equipotential connection method between vehicle bodies 5.4\u2002Typical grounding design scheme <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 6.\u2002Grounding performance measurement and evaluation 6.1\u2002Typical grounding design scheme 6.2\u2002Voltage parameter measurement and evaluation scheme <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 6.3\u2002Current parameter measurement and evaluation scheme <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Back cover <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" IEEE Guide for Multi-Point Grounding System of Trains in Electrified Railway (Approved Draft)<\/b><\/p>\n |