1. Introduction of distributed lightning protection

——"Centralized monitoring and decentralized installation"

Principle: The integrated intelligent lightning protection module (SPD+SCB+intelligent acquisition unit) is scattered in each panel cabinet to be protected, and the communication signal is sent to the monitoring background through the 485 port of the intelligent acquisition terminal to realize the centralized monitoring of the traction substation , SPD distributed installation of intelligent lightning protection.

2. Introduction of centralized combined screen lightning protection

Principle: The lightning protection devices required in each panel cabinet are centrally installed to form an independent lightning protection panel cabinet, and a monitoring background is set in the lightning protection panel cabinet to realize the intelligent lightning protection of centralized installation and centralized monitoring of the traction substation.

3. Performance comparison of distributed lightning protection and centralized combined screen lightning protection

1) Common point: all of them can realize intelligent monitoring of SPD, and can centrally display and store SPD in each panel cabinet

status information of the operation.

2) Differences: The installation method of the distributed type is scattered in each panel cabinet, while the centralized combination panel type is an independent group panel.

3) Comparison of advantages and disadvantages:

a. The centralized and distributed installation method SPD can be close to the protected equipment to achieve the best protection effect on the circuit; the SPD of the centralized independent group screen will be far away from the protected equipment, which does not meet the "proximity principle" of equipment lightning protection.

When the SPD is too far away from the protected equipment, due to the existence of line inductance, the lightning overvoltage wave (electromagnetic wave) will appear wave reflection under the action of electromagnetic oscillation, and the amplitude will further increase, making it difficult to protect the equipment.

b. The lightning protection branch connection line of the distributed installation method will be slightly longer than that of the centralized combined screen, but the centralized independent grouped screen needs to occupy the space of the inner disk, and the loop cable is in and out of the "lightning protection screen". In the process of lightning, a large loop will be formed, and in the electromagnetic field of lightning, a high loop voltage will be further induced;

c. For the renovation of existing projects, after the SPD circuit is installed in the distributed installation method, the panel cabinet is

For crowding; and the centralized independent panel grouping method, because the loop cable laying method of the existing project has been fixed, it is necessary to

Re-laying the cables is a huge amount of work.

Railway is the focus industry of Anhui Jinli. From the perspective of product application, SPD has shown a trend of scene application customization. At the same time, SPD is rapidly developing in the direction of intelligence and digitization, from fault tripping remote signaling, lightning counting, to peak value With the integration of detection, waveform restoration, life prediction, and grounding grid resistance monitoring, lightning warning and other services, lightning protection products have gradually been integrated into the booming digital wave