GB/T 38435-2019 in English
VALIDSpecification for protection configuration and setting for transmission line of electrified railway traction station
- Issued on:2019-12-31
- Implemented on:2020-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 38435-2019牵引站供电线路的继电保护配置及整定计算原则》由524（中国电力企业联合会）归口，主管部门为中国电力企业联合会。
Introduction
GB/T 38435—2019 Standard Interpretation: Configuration and Setting Calculation Principles of Relay Protection for Traction Station Power Supply Line
1. Background and Significance of Standard Formulation
With the rapid development of electrified railways in my country, the safe and stable operation of traction station power supply lines has become particularly important. The formulation of GB/T 38435—2019 aims to standardize the configuration and setting calculation of relay protection for traction station power supply lines to ensure the safety of the power grid and reliable power supply. This standard puts forward specific technical requirements and implementation methods for traction station power supply lines with voltage levels of 110kV and above.
2. Comparative analysis of standard frameworks
| Chapter content | Specific requirements | Technical focus |
|---|---|---|
| Configuration principles for relay protection of traction station power supply lines | Specifies the dual configuration requirements for main protection and backup protection, emphasizing the reliability and selectivity of protection devices. | Independent configuration of secondary windings of current transformers, independent design of longitudinal protection channels, etc. |
| Principles for calculation of relay protection setting | Specifies the specific requirements for the start value, action time and protection coordination relationship, ensuring the sensitivity and quickness of the protection device. | Setting methods for distance protection, zero-sequence current protection and PT line-break overcurrent protection. |
| Implementation and management suggestions | Emphasizing the coordination between power grid users and dispatching agencies, a dual-set line protection implementation plan for the traction station side is proposed. | Realization method of remote trip function, coordination of standby automatic switching time and system stability requirements. |
3. Implementation suggestions and precautions
Case analysis:During the construction of the power supply line of an electrified railway traction station, dual sets of longitudinal current differential protection were configured in strict accordance with the requirements of GB/T 38435-2019 standard, and the zero-sequence and distance protection settings were verified through measured parameters. This scheme effectively avoids protection malfunctions caused by load fluctuations and asymmetric faults.
Implementation suggestions:
- Strengthen communication and cooperation between power grid users and dispatching agencies, and clarify the setting range of protection devices.
- Strictly configure dual sets of longitudinal protection and dual design in accordance with standard requirements to ensure system redundancy.
- Regularly check protection device parameters and optimize setting values based on actual operating data.
- For special power supply modes (such as two-phase power supply), strengthen the analysis of short-circuit faults on the low-voltage side of traction transformers.
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