Cabinet Grounding Issues Found in an Intelligent Transportation System – A Case Study
The government defines an Intelligent Transportation System (ITS) as a system that applies advanced technologies of electronics, communications, computers, control and sensing and detecting in all kinds of transportation systems in order to improve safety, efficiency and service, and traffic situation through transmitting real-time information.
A working system will:
- improve traffic safety
- relieve traffic congestion
- improve transportation efficiency
- reduce air pollution
- increases in energy efficiency all type of transportation vehicles
As technology has moved towards higher sophisticated computer controls by Artificial Intelligence software, it is critical that all subsystems like remote sensors, cameras (facial and license plate optics and thermal imaging), motion sensors and traffic counters. signal light controls all receive reliable power referenced to a low resistance ground connection.
This case study will focus on a ground audit conducted by the Kansas Department of Transportation and CITEL, Inc. in September 2019. This audit included seven different locations using different types of electrical signal cabinets. The cabinets were designed to be capable of controlling remote cameras, lumamaire lighting, motion detection and variable messaging signs. All of the cabinets audited were supplied fiber optic cable from a local telecommunication company and each cabinet was connected to a power company AC supply via a PDA. The PDA supplied AC to AC/DC converters, supplying DC power to internal computer and controller equipment. The DC supply also provided -48V power to all remote camera and sensors running off of PoE.