Subway Electrical Safety Solution

Project Overview

The subway is one of the most important rail transit projects, which can effectively alleviate the problem of urban traffic congestion, facilitate people's travel, and reduce environmental pollution. However, fires are prone to occur, and many safety hazards will occur during the operation of the subway .

According to statistics from the Fire and Rescue Bureau, China received 233,000 fires in 2019, killing 1,335 people, wounding 837 people, and direct property losses of 3.6 billion yuan. Electrical fires accounted for 34.6%. Of the 67 large fires, 37 were caused by electricity, and of the 4 major fires, 3 were caused by electricity.

Qingdao Metro Line 1 has a total length of 59.97km, all of which are underground. The line starts in Huangdao District, passes through the main urban area of Qingdao, and ends at Dongguozhuang, Chengyang. There are 41 stations on the whole line, all of which are underground stations, of which 12 are transfer stations. The maximum distance between stations is 6758m, which is Donghuan Road Station-Guizhou Road Station; the minimum distance between stations is 698m, which is Guizhou Road Station-Xizhen Station, the average station. With an interval of 1486m, there are 2 depots along the line-Anshun Vehicle Base and Dongguozhuang Depot, 1 parking lot-Wawuzhuang parking lot, and 1 control center-located on the southeast side of the intersection of Changjiang Road and Emeishan Road in Huangdao District .


System Composition


In this project, the leakage current monitoring of all feeder circuits in the 400V substation make it realize the early warning of electrical fires. Each station, depot or parking lot 400V substation on the whole line is equipped with a set of electrical fire monitoring systems, a total of 49 sets. In addition, each electrical fire monitoring system is linked with the FAS system of the vehicle control room to alarm and fault information, and timely transmits the early warning and fault information to the upper level, which is convenient for users to centrally manage on-site information.


System Wiring


System Features

Ultra low power consumption

Detector power consumption is 0.02W, each loop supports node loading within 200, and the standard 1.5mm2 twisted pair communication distance is 1500 meters when fully loaded

Lower cost

The system is upgraded to TBUS two-bus communication, the system is more stable, the signal and power share two wires, which saves wiring costs

Quick installation

Detector screw installation, rail installation, and panel embedded installation are optional to meet all use environments

Easy to debug

Detector screw installation, rail installation, and panel embedded installation are optional to meet all use environments

Large monitoring range

Can be matched with 400:1, 2000:1, 10000:1 transformer, no need to customize separately

Solution Design


System Topology



Field Application


Application Products




LoRa/Modbus 3 Phase Energy Meter                


It is a intelligent power measurement and control terminal that integrates power monitoring, energy metering management, power quality analysis and electrical safety.