Design of emergency lighting evacuation indication system for urban rail transit station

Encore Hua Nan

Preface ：

The traditional emergency lighting and evacuation indication lighting in urban rail transit stations are controlled by AC  220V  Power supply , With the new national code for emergency lighting and evacuation indication system GB51309-2018 perform , The existing design scheme does not meet the requirements of the specification . This paper introduces a new design scheme of emergency lighting and evacuation indication system , The new scheme retains the backup lighting in the traditional scheme, which is still provided by  EPS Power supply , A set of evacuation indication lighting system has been added , The new system can exchange urban rail transit routinely 220V The power supply is converted to DC 36V The power supply supplies power to the evacuation lamps , And the new system adds the system host and the corresponding control system , With communication and monitoring functions , It can realize real-time monitoring and control of the whole system , The safety of evacuation lighting indication system is improved 、 Reliability and newness .

keyword ： Urban rail transit station ; Emergency lighting ; Evacuation instructions ;GB51309

1.  Design scheme of traditional emergency lighting and evacuation indication system

The station emergency lighting consists of standby lighting and evacuation indication lighting . The illuminance of normal lighting and emergency lighting design of the station shall not be lower than that in table  1 The specified value . According to the requirements of subway fire protection design standard , Setting scheme of standby lighting ：（1） In the substation 、 Electricity Distribution Room 、 Environmental control electric control room 、 Communication room 、 Fire pump room 、 vehicle Station control room 、 Standby lighting for emergency command and emergency equipment setting places such as station master room , Its illumination is not lower than that of normal illumination 50%.（2） Station public area 、 Standby lighting illuminance in other places such as entrance and exit passages , Press the illumination not lower than the normal illumination 10% Set up .（3） In order to make full use of resources , Under normal conditions , Backup lighting as part of working lighting , Under the emergency state, the disaster prevention alarm system is forced to light up .

Power system scheme for emergency lighting and evacuation indicator lights ： Emergency lighting （ Backup lighting ） And evacuation indication lighting are provided by a complete set of emergency lighting power supply devices  EPS Power supply ,EPS There is a battery as a backup power supply . Normally, it is divided into two sections by the substation 0.4kV The bus leads one AC power terminal for switching power supply , The battery is in floating charge ; When the normal AC power supply is cut off , The battery is inverted into 380/220V AC power continues to supply power for emergency lighting . The battery capacity meets 90min The need for power supply . The emergency power cabinet shall have a disaster prevention alarm system （FAS） The function of centralized forced start emergency lighting . Emergency power cabinet adopts EPS ark , Lead acid maintenance free battery . Generally, one set is set at both ends of the station EPS, Be responsible for the station 、 Power distribution of emergency lighting and evacuation indication lighting at small mileage end .

 

2.  Design scheme of new emergency lighting and evacuation indication system

The new emergency lighting and evacuation indication system still retains backup lighting , Backup lighting is still provided by  EPS Power supply , The illumination of standby lighting still meets the table 1 The requirements of . Add DC36V Powered evacuation lights and evacuation indicators , The new evacuation lighting system is powered by distributed centralized power （A Type centralized power supply ）, And it is managed and controlled by a host of evacuation lighting system .

controller choice ：A-C-A100

 

Centralized power supply selection ：A-D-0.5KVA-A200FP

 

The schematic diagram of evacuation lighting system is shown in the figure  1 Shown .A The centralized power supply of type a emergency lighting can be input AC220V Power conversion to DC36V Power Supply , Each centralized power feed 8 A circuit , The rated current of each circuit is 6A, The number of evacuation lights or evacuation indicator lights connected in series in each circuit shall not be greater than 60 individual , And the normal working current of the circuit is not greater than 5A. Standard stations are set at both ends 3 individual A Type centralized power supply , common 6 All centralized power supplies are connected to the system host through communication lines , The host can realize the centralized control of the evacuation lighting system of the whole station .

 

chart 1  Schematic diagram of new evacuation lighting indication system

The power and installation of evacuation lights are as follows ：

（1） Corridor in housing area ： Single lamp 3w, Wall mounting , Mounting height 2.5m, spacing 8m about , Intensity of illumination ≥3lx.

At the corner of the corridor in the housing area 、 stair case ： Single lamp  3w, Wall mounting , Mounting height 2.5m, Intensity of illumination ≥5lx.

Vehicle control room in the housing area 、 Lighting distribution room 、 Environmental control electric control room 、 Fire pump room 、 Substation distribution room . Single lamp  3w, Wall mounting , Mounting height 2.5m, Intensity of illumination ≥1lx.

（2） Public area of station hall platform 、 Entrance and exit passages ： Single lamp 6w, Ceiling installation , spacing 6m about , Intensity of illumination ≥3lx.

Stairs in public area of station hall platform 、 Escalator . Single lamp  6w, Ceiling installation , Intensity of illumination ≥5lx.

The power and installation of evacuation indicator lights are as follows ：

（1） The building area corridors at both ends of the station hall platform 、 stair case . Single lamp 1w, Wall mounting , Mounting height 0.5m, The spacing shall not be greater than 10m.

（2） Public area of station hall platform 、 On the side wall and column of the entrance and exit passage . Single lamp 1w, Wall mounting , At the same position away from the ground 0.5m And 2.2m Install an indicator light at each position . The horizontal distance between two lamps in the public area shall not be greater than 10m. Pictured 2 Shown is the layout plan of evacuation lighting and evacuation indicator lights at a certain entrance and exit of the station .

Lamp selection ：

3.  Analysis and comparison of new and old schemes  

Compared with the traditional scheme, the new emergency lighting and evacuation indication system has the following characteristics ：

（1） Separate the evacuation indication system from the backup lighting in the emergency lighting , Backup lighting is provided by EPS Power supply , Normal lighting fixtures can be used ; The evacuation indication system consists of A Type centralized power supply , And set the evacuation indication system to control the host . This improves the reliability of the evacuation indication system , A relatively independent evacuation indication system has been formed , With independent power supply and control system , Try to avoid the interference of external power supply .

（2） All evacuation lights and evacuation sign lights adopt safe voltage AC36V Power supply , Avoid the fire , Sprinkler system 、 The water produced by the fire hydrant system and other water extinguishing systems wet the lamps , Make the lamp shell conductive, resulting in electric shock accidents during personnel evacuation , Improved security .

（3） The new system adopts distributed centralized power , When the centralized power supply in a certain area fails , It will not affect the normal operation of centralized power supply in other areas , The power supply reliability of evacuation indication system is improved .

（4） The new system adds evacuation lighting and indication system control host , It can monitor lamps in real time 、 Operation status of the whole system such as power supply , While realizing the intellectualization of the system , Improve the efficiency of operation management .

4.  Conclusion

Design scheme of emergency lighting and evacuation indication system for new urban rail transit stations , The scheme meets the requirements of the national standard for fire protection design of urban rail transit , The safety of evacuation lighting indication system is improved 、 reliability , And conform to the development of new technology, an independent intelligent evacuation lighting monitoring system has been formed , It can better meet the requirements of safe evacuation in the fire mode of urban rail transit stations .