The technology of rail transit is developing fast, as more and more auto-control systems are applied to the rail transit system, the operation efficiency and speed is well improved.
Along with the technology development, lots of high-precision and high-speed processing systems are used, the working voltage is getting lower, the anti-interference ability of the system is greatly reduced, and the system security becomes fragile. In operation, due to lightning invasion, power system failure, the over-voltage caused by the complex electromagnetic environment, the systems might be working in risks.
In view of this, PTG provides the complete lightning and surge protection scheme for each system of urban rail transit, including:
- Medium voltage AC traction substation
- DC traction catenary
- Low voltage power system
- Lighting system
- Automatic Fare Collection system (AFC), including line center, station equipment, field equipment, etc;
- Fire alarm system
- Environment and equipment monitoring system
- Video monitoring system
- Police and civil communication system
- Passenger information system
- Train operation control system
- Platform screen door control system, etc
In accordance to:
1. IEC 62305: Protection against Lightning
2. IEC 61312: Protection against Lightning Electromagnetic Impulse
3. IEC 61643-11: Low-voltage Surge Protective Devices
4. IEC 61643-21: Surge protective devices connected to telecommunications and signaling networks - Performance requirements and testing methods
PA 35K-10W-10 is used for the protection of the medium - voltage traction power supply system of high - speed railways; PV 1500-40M2-21R is used for the protection of the power supply system of urban rail transit.
25/100 kA T1+T2 class, 40/80 kA and 20/40 kA T2 class SPDs (Surge Protective Devices) as well as their corresponding SCBs (Surge Current Breakers) are used for the protection of 0.4 kV switchgear cabinets, environmental control cabinets, distribution boxes of various systems, etc.
1/4λ DIN 7/16 connector and GDT N connector coaxial antenna-feeder SPDs are used in scenarios such as transceiver systems, antennas, and antenna-feeder lines on the equipment room side.
Gigabit high-speed network (RJ45 interface), power supply 2-in-1 and BNC connector coaxial SPDs are used in video surveillance systems.
PD LA-24W is used for RS 485, RS 422 and various signal transmission systems; PD RJ48-2X1000-4 is used for the protection of network transmission systems; PE 30-2W3-21R-S25 is used for precision protection of signal power supply systems.
PE 385-80W2-31R, PE 255-6W3-21R-S25 and PD N180-FMR are used for the protection of wireless AP track-side boxes in train control systems and passenger information systems.
