Xi 'an Metro Line 1, Line 2, Line 3 SF6 gas monitoring alarm device maintenance project

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Xi 'an Metro Line 1, Line 2, Line 3 SF6 gas monito

1. Project name

Xi 'an Metro operation branch2019Annual main substation of Line 1, 2 and 3SF6Gas detection and alarm device (including probe) maintenance items

2. Project overview

This project is mainly for first and second line4Main substationSF6Gas detection and alarm device maintenance and functional testing, on line 3SF6Gas detection alarm device function test, verify the accuracy of the function, can restore real-time monitoring switch (GISIndoor monitoring unitsSF6Concentration status, oxygen concentration, timed ventilation,SF6Abnormal concentration and oxygen level automatic ventilation,Forced ventilation, voice function, flute and sound and light alarm functions.

3. Project workload

Wevers is responsible for the maintenance project of SF6 gas detection alarm device (including probe) in main substation of Line 1, 2 and 3 of Xi 'an Metro Operation Branch in 2019. Maintenance and functional testing of SF6 gas detection and alarm devices in 4 main substations of Line 1 and Line 2, and functional testing of SF6 gas detection and alarm devices of Line 3. The scope of maintenance work is as follows:

(1) Line 1 and 2SF6Gas detection and alarm device maintenance content:

Jinhua main substation, Xiyuan main substation, Administration center main substation, Exhibition center main substation, Bowen Road main substationSF6The gas detection and alarm device restores the following functions through maintenance:

oneImplemented by maintenanceSF6Normal display of monitoring information of gas detection and alarm device; Dynamic display switch (GISIndoor monitoring unitsSF6Concentration status and oxygen content when concentration exceeds1000ppm(National standard value, users can set their own),SF6Concentration status Red warning, otherwise green indicates normal value. hypooxygen18.0%(national standard value, user can set), oxygen value red font prompt, otherwise normal color display actual value (such as20.5%);

2.DetectionSF6Gas detection and alarm device timing ventilation function, can be ventilated on demand;

3.DetectionSF6Normal display of monitoring information of gas detection and alarm device; effectSF6Accuracy of gas monitoring, oxygen monitoring temperature and humidity;

4.Detect whether the voice prompt function is normal;

5.Detect whether the infrared sensing function of human body is normal;

(2) Wuzhuang main substation of Line 3 Main substationSF6Gas detection and alarm device maintenance content:

oneDetectionSF6Gas detection and alarm device timing ventilation function, can be ventilated on demand;

2.DetectionSF6Normal display of monitoring information of gas detection and alarm device; effectSF6Accuracy of gas monitoring, oxygen monitoring temperature and humidity;

3.Detect whether the voice prompt function is normal;

4.Detect whether the infrared sensing function of human body is normal;

4. Technical parameters

SF6 gas detection and alarm device maintenance and replacement equipment and technical standards

Serial number	Maintenance and replacement items	Technical standard	remark
one	Monitor host	Standard: Rated operating voltage: ACAC85V~265V, direct currentDC110V~340V; Communication Protocol:ModbusRated power: host ≤25VA, Sensor ≤6VA; Alarm contact capacity:AC220V/10A Implementation function: YesSF6Gas concentration, oxygen concentration, temperature and humidity display, display the last fan start, stop time, infrared detection, forced ventilation, hypoxia alarm, timed ventilation, LCD display automatic point/Back light and voice prompt function. Host large screen LCD display, all operations can be completed through the LCD display, you can view the current real-time monitoring data, open manually/Shut down the fan, view the history record, view the alarm record, and set the system parameters.	(Currently on the marketSF6Monitoring hosts generally adopt standardsModbusThe protocol, the technical agreement is open, there are no technical barriers between different manufacturers)
2	SF6andO2Dual gas probe	Standard: SF6 Detection range: 0~3000ppmv, accuracy ≤ ± 5.0% FS SF6Alarm point:50ppm~1000ppmInternal Settings, default1000ppm Oxygen detection range:0~25VOL.%, Accuracy<±1%(0.5%,O2in21%Hour) Oxygen concentration alarm point:15% ~ 20%Internal Settings, default18%
3	Temperature and humidity probe	Temperature detection range:- 25 ~ 60° C, accuracy ≤2℃ Humidity detection range:0~100 RH%, accuracy ≤5RH%
4	Control fan capacity	Fan controller contact capacity:380VAC 32A (Can be multiple combinations)
5	Far-infrared probe	Standard: Detection distance:6m Detection Angle: 110 degrees Sensor: dual-element pyrogenic infrared sensor Working temperature: -10º C ~ +50º C Ambient humidity requirements: Maximum 95%RH (no condensation) Installation method: wall hanging or corner installation Installation height: 1.4m
6	Alarm indication	Standard: red alarm lamp Working voltage: 24V
7	Shielded cable	Standard: ZR-RVVP4 * 0.75
8	Power cable	Standard: ZR-RVV2 * 2.5
9	Fastening attachment	Standard: Cable ties, screws, etc
10	Functional detection	Required concentration18%Of oxygen;1000pmsSF6Gas for functional testing	After the gas spray, the main engine starts and the fan starts

Please refer to the attachment for the specific workloadXi 'an Metro Line 1 main substationSF6Statistics of the number of equipment required for maintenance of gas detection and alarm devices

V. Project objectives and technical requirements

(A) maintenance implementation standards

oneThe project shall comply with the following (but not limited to) technical standards and specifications (the version shall comply with the new version if updated) :

GB26860-2011Electric Power Safety Working Regulations

GB/T8905-2012Guidelines for Gas Management and Detection of Sulfur Hexafluoride in Electrical Equipment

DL/T 595-2016 Guidelines for gas supervision of sulfur hexafluoride electrical equipment

(2) Technical requirements of the project

oneownSF6The installation height of the concentration monitoring host is based on the central position of the display screen and the human line of sight, and is generally installed in accordance with the regulationsGISNear the entrance of the room shall prevail;

2.The installation height of all monitoring units is controlled off the ground10cmHeight within the specific location to install in eachGISThe lower center area of the circuit breaker interval shall prevail;

3.All power cables output from each monitoring unit (specifications:RVV3 * 2.5) and shielded signal transmission cable (specifications:RVVP4 * 0.75) Through the cable trench or cable trough to the entrance of the wall-mounted host chassis;

4.SF6Host power supply (220VACEnsure that it is extracted from the power distribution box of the main station24Hourly real-time power supply;

5.The original manual fan control circuit is incorporated into the originalSF6The automatic control loop of the concentration online monitoring system is formed without affecting the original manual control function, and it is increased bySF6Overrun or hypoxia, or manual forced control on the monitoring system, or timing control of a variety of fan control functions;

6.Static testing of the above equipment after installation;

7.The whole system formed by the above equipment is dynamically debuggable after power-on until normal operation;

8.Before the construction of this project, the applicant for inquiry and comparison price shall provide a certificate issued by a third-party testing company (a national authority)SF6The test report of the gas detection and alarm device shall not be put into use until it is examined by the comparator;

9.Test and acceptance of the system; Handover of all technical data, user manual and other documents of the system;