TB/T 2993.1-2016 in English
VALIDRailway communication power supply. Part 1: General requirements of power supply system for communication
- Issued on:2016-11-18
- Implemented on:2017-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
| Standard No: | TB/T 2993.1-2016 |
| Document status: | VALID |
| Title in English: | Railway communication power supply. Part 1: General requirements of power supply system for communication |
| Title in Chinese: | 铁路通信电源 第1部分：通信电源系统总技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-11-18 |
| Implemented on: | 2017-06-01 |
| Professional Classification: | TB-Railway Transport |
| Related Keywords: | railway communication power supply
communication power supply system power supply system power supply monitoring system railway communication power supply series standards |
| Related Topics: | tb/t 1961-2016
tb/t3441-2016 tb/t3367-2016 tb/t2993.5-2016 Power Systems power always cut off Communication circuit board gold source tb/t3440-2016 Communication power Lightning Protection Technology of Communication Engineering Power System power supply tb/t 3466-2016 tb/t 3432-2016 |
Introduction
Interpretation of the core content of the standard
TB/T 2993.1-2016, as the basic part of the railway communication power supply series standards, systematically stipulates the technical requirements of key components such as high-frequency switching rectifier equipment and UPS system. For the first time, the standard clearly subdivides the communication power supply system into 6 subsystems, reflecting the modular design concept of railway communication power supply.
System Architecture and Technical Parameters
| Subsystem | Key Indicators | Allowable Range |
|---|---|---|
| External AC Power Supply | Voltage Fluctuation | -20%~+20% |
| DC Power Supply System | Output Voltage | -43.2V~-57.6V |
| UPS Equipment | MTBF | ≥5×10⁴h(Indoor Type) |
Analysis of key technical requirements
Power supply reliability guarantee
The standard requires that dual-channel AC input must be equipped with electrical + mechanical double interlocking devices, and the MTBF index must reach more than 1×10⁴ hours. In particular, the strict requirements for the noise voltage of high-frequency switching rectifier equipment are proposed in reference to TB/T 2993.2-2016.
UPS working mode
- Parallel redundant mode: multiple UPSs can be connected in parallel through a synchronous controller
- Independent dual bus: two completely independent power supply systems
- Stand-alone mode requires a backup battery pack
Implementation suggestions
Lightning protection and grounding system construction
Article 9.2 of the standard clearly requires the use of voltage-limiting SPD devices. It is recommended to install a Class I SPD at the input end of the distribution cabinet, and its voltage protection level Up should be ≤2.5kV. Typical implementation plan:
- AC power distribution panel is equipped with three-level SPD protection
- DC working grounding resistance ≤4Ω
- Equipment rack and grounding bus are connected by 35mm² copper cable
Standard evolution analysis
Compared with the old version of the standard, the 2016 version is mainly improved in the following aspects:
- New outdoor MTBF requirements for UPS equipment (≥1×10⁴h)
- Clearly define the quantitative indicator of DC power supply voltage drop ≤3.2V
- Strengthen the interface specification between power supply monitoring system and railway environmental monitoring
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