Fiber optic temperature measurement system/fiber optic temperature controller solution for rail transit

Why does the traction power supply system of rail transit need to use fluorescent fiber optic temperature measurement

The power supply systems for traction power supply in urban rail transit in China are DC750V and DC1500V, corresponding to the current collection methods of the third rail and overhead contact network, respectively. The maximum voltage of the secondary winding of this power supply system's transformer has exceeded 1000V, but the measurement range specified in the "Electronic Temperature Controller for Transformers" (JB/T7631-2016), which uses Pt100 as the temperature sensor, can only be limited to below 1000V. Therefore, rail transit has higher voltage resistance requirements for temperature sensor probes and leads.

The fiber optic temperature controller for rail transit uses a fluorescent fiber optic temperature sensor independently developed by Huaguang Tianrui as the temperature sensing element. This temperature sensing element is immune to electromagnetic interference and resistant to high voltage (100KV/fiber to ground lead distance of 0.4m). Fluorescent fiber optic temperature measurement completely cuts off the interference of temperature measurement elements transmitted to the temperature controller from the temperature measurement source, improving the safety level of rail transit.

Advantages of Fluorescent Fiber Optic Temperature Measurement System Applied in Rail Transit

For the operating environment of rail transit transformers, isolation and shielding from external electrical interference signals are achieved from the power supply, signal input end, signal output end, and temperature control box shell.

The power supply system of rail transit traction power supply is based on DC750V and DC1500V, while the measurement range specified in the "Electronic Temperature Controller for Transformers" (JB/T7631-2005), which uses Pt100 as the temperature sensor, can only be limited to below 1000V. Therefore, the fiber optic temperature controller has extremely strong voltage resistance and can withstand 100KV.

In response to vibration, dust, humidity, oil pollution and other on-site working environments, multi-layer protective measures are taken to ensure that the fiber optic temperature controller for rail transit has good electromagnetic compatibility, ensuring the stable and reliable operation of the temperature controller.

Design principles of fluorescence fiber optic temperature measurement system

Principle of practicality

The system construction adheres to the principle of practicality. On the basis of practicality, progressiveness and foresight are considered, and standard, advanced and mature products and development platforms are selected to build a system that is practical and solves practical problems.

Standardization principle

The system software and hardware platforms and application development tools used in application construction should comply with national standards, standards of the Ministry of Information Industry, relevant technical specifications and requirements of the company.

The principle of uniformity

Following the policy of centralized information management, overall planning, overall design, and step-by-step implementation, the implementation process embodies four unified principles: unified leadership, unified planning, unified standards, and unified organization and implementation.

Reliability principle

The software and hardware resources need to ensure the uninterrupted and reliable operation of the fiber optic temperature measurement system for 7 × 24 hours. Therefore, it is necessary to equip a complete design of reliability measures to ensure the highly reliable operation of the system and fully consider the reliability requirements of key system applications.

Reliable security mechanism

This system adopts a series of secure encryption measures, with a built-in 64 bit encryption algorithm. The system has higher security and can effectively prevent data leakage and theft, ensuring the security, accuracy, and integrity of the system's data, and preventing illegal operator operations and legitimate operator illegal operations.

The operation interface is simple, friendly, and highly intelligent

The system automatically checks the legality of the input data and provides friendly prompts for operator errors.

Stable operation and reliable data.

The platform is easy to operate, easy to master, and the installation process is simple. Data can be automatically generated into various reports as needed, improving management efficiency.

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