Sulfur hexafluoride monitoring system

Abstract

The utility model discloses a sulfur hexafluoride monitoring system which is composed of an SF6 monitoring system, an oxygen monitoring system, an exhaust system, an infrared induction system, a display system, an alarm system and a control system, and the sulfur hexafluoride monitoring system monitors the concentration of SF6 gas and the concentration of oxygen in a high-voltage electrical equipment room in real time through the SF6 monitoring system and the oxygen monitoring system. According to the utility model, an air exhaust system, an infrared induction system, a display system and an alarm system are arranged to timely carry out processing, alarm and prompt when the abnormal state occurs, and automatic control and manual control are realized through two sets of controllers arranged indoors and outdoors; the safety guarantee degree of workers is improved to a greater extent, and alarm information transmission is more reliable and humanized.

Description

Technical Field

[0001] The utility model relates to the technical field of gas monitoring equipment, in particular to a sulfur hexafluoride monitoring system. Background Art

[0002] Sulfur hexafluoride (SF6) is a colorless, odorless, non-toxic, non-flammable stable gas with good electrical insulation properties and excellent arc extinguishing performance. It is often used as an insulating medium and arc extinguishing medium for electrical equipment. Although pure sulfur hexafluoride gas is non-toxic, it is necessary to prevent the concentration of sulfur hexafluoride gas from rising to the level of oxygen deficiency in the workplace. Therefore, the allowable concentration of sulfur hexafluoride gas in the operating room air should not be greater than 6g / m 3 In addition, sulfur hexafluoride gas will also decompose under the action of electric arc to generate toxic gas that is harmful to the human body. Therefore, a sulfur hexafluoride gas monitoring system must be installed around equipment filled with sulfur hexafluoride gas.

[0003] The applicant's existing 35kV substation GIS equipment is filled with SF6 gas. The original monitoring system uses a traditional air pump to continuously extract air from the bottom of the equipment through a three-way air duct and introduces it into the analytical instrument for SF6 content detection. Once the SF6 gas concentration is detected to be excessive, the instrument will sound an alarm and start the exhaust fan for exhaust. However, since there are multiple access doors to the GIS room, there is a certain distance between the monitoring instrument and the GIS room. It cannot be guaranteed that the prompt sound can be heard at every door. The safety is not high enough and the system needs to be upgraded. Utility Model Content

[0004] The purpose of the utility model is to provide a sulfur hexafluoride monitoring system which solves the above technical problems.

[0005] To this end, the technical solution of the utility model is as follows:

[0006] A sulfur hexafluoride monitoring system, consisting of an SF6 monitoring system, an oxygen monitoring system, an exhaust system, an infrared sensing system, a display system, an alarm system and a control system; wherein:

[0007] The SF6 monitoring system includes a monitor and an SF6 gas electron capture detector installed in the cable layer of the electric cabinet in the GIS room, so as to monitor the SF6 gas concentration in the electric cabinet gas through the SF6 gas electron capture detector and send out an SF6 excessive alarm signal when the SF6 gas concentration exceeds the set threshold;

[0008] The oxygen monitoring system is equipped with monitors and oxygen electron capture detectors at the cable layer of the electric cabinet in the GIS room to monitor the oxygen concentration in the gas in the electric cabinet through the oxygen electron capture detector and send out an oxygen deficiency alarm signal when the oxygen content is lower than the set threshold;

[0009] The exhaust system consists of multiple exhaust fans, which are arranged side by side on the wall of the GIS room on one side of the outer wall;

[0010] The infrared sensing system consists of multiple infrared sensors, which are installed one by one on the outer wall of each passage door of the GIS room to sense and detect the staff approaching the passage door of the GIS room;

[0011] The display system consists of multiple electronic display screens, which are installed one by one on the outer wall of each passage door of the GIS room to display the monitoring results of the SF6 monitoring system and the oxygen monitoring system in real time;

[0012] The alarm system consists of multiple alarms, which are installed one by one on the outer wall of each passage door of the GIS room to sound an alarm when the monitoring results are abnormal;

[0013] The control system includes an indoor controller and an outdoor controller; the indoor controller is arranged in the GIS room, and is respectively connected to the SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system and alarm system, so that when the indoor controller receives the SF6 exceeding standard alarm signal and / or the oxygen insufficient alarm signal, it starts the exhaust system and the alarm system; when the indoor controller receives the sensing signal of the infrared sensing system to the staff, it starts the display system to display the monitoring results of the SF6 monitoring system and the oxygen monitoring system; the outdoor controller is arranged in the GIS outdoor wall electrical cabinet, and is respectively connected to the alarm system and the exhaust system to control the opening and closing of the alarm system and the exhaust system.

[0014] Furthermore, at least two SF6 gas electron capture detectors are provided in the SF6 monitoring system and are arranged at different positions of the cable layer of the electric cabinet in the GIS room.

[0015] Furthermore, the number of oxygen electron capture detectors in the oxygen monitoring system is at least two and they are arranged at different positions of the cable layer of the electric cabinet in the GIS room.

[0016] Furthermore, the exhaust system is composed of four exhaust fans, which are respectively arranged on the upper and lower sides of the wall.

[0017] Compared with the existing technology, the sulfur hexafluoride monitoring system consists of an SF6 monitoring system, an oxygen monitoring system, an exhaust system, an infrared sensing system, a display system, an alarm system and a control system. The SF6 monitoring system and the oxygen monitoring system monitor the SF6 gas concentration and the oxygen concentration in the high-voltage electrical equipment room in real time to ensure that the staff is promptly prompted when an abnormal state occurs. The exhaust system, the infrared sensing system, the display system and the alarm system are set up to handle, alarm and prompt in time when an abnormal state occurs. Automatic control and manual control are realized by two sets of controllers set up indoors and outdoors, which greatly improves the safety of the staff and makes the alarm information transmission more reliable and humane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the sulfur hexafluoride monitoring system of the utility model. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0020] See also Figure 1 The sulfur hexafluoride monitoring system consists of SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system, alarm system and control system.

[0021] The SF6 monitoring system includes a monitor installed in the cable layer of the GIS indoor electric cabinet and three SF6 gas electron capture detectors; the three SF6 gas electron capture detectors are installed at different positions of the cable layer to monitor the SF6 gas concentration in the electric cabinet gas and send out an SF6 excessive alarm signal when the SF6 gas concentration exceeds the set threshold. The setting of three SF6 gas electron capture detectors prevents the failure of the system's SF6 gas monitoring function when a single SF6 gas electron capture detector is damaged.

[0022] The oxygen monitoring system is equipped with a monitor and three oxygen electron capture detectors in the cable layer of the GIS indoor electric cabinet; the three oxygen electron capture detectors are set at different positions of the cable layer to monitor the oxygen content in the electric cabinet gas and send out an oxygen deficiency alarm signal when the oxygen content is lower than the set threshold. The setting of three oxygen electron capture detectors prevents the oxygen concentration monitoring function of the system from failing when a single oxygen electron capture detector is damaged.

[0023] The exhaust system consists of four exhaust fans, which are arranged side by side on the wall of the GIS room on one side of the exterior wall, and are installed on the upper and lower sides of the wall respectively to increase the ventilation area with the outside world; when the exhaust fans are started, the exhaust fans can be used to exhaust air to achieve ventilation between the GIS room gas and the external atmosphere;

[0024] The infrared sensing system is composed of multiple infrared sensors; the number of infrared sensors is the same as the number of passage doors in the GIS room, and they are installed one-to-one above the outer walls of each passage door of the GIS room to sense and detect staff approaching the passage door of the GIS room; specifically, the infrared sensor uses a monitoring distance that can reach staff 1m away from the passage door of the GIS room.

[0025] The display system consists of multiple electronic display screens; the number of the electronic display screens is the same as the number of the passage doors of the GIS room, and they are installed one by one above the outer walls of each passage door of the GIS room to display the monitoring results of the SF6 monitoring system and the oxygen monitoring system in real time; specifically, the electronic display screens are set to display "oxygen concentration is normal" or "oxygen concentration is abnormal", and "SF6 concentration is normal" or "SF6 concentration is abnormal" to remind staff of the gas status in the GIS room.

[0026] The alarm system is composed of multiple alarms; the number of alarms is the same as the number of passage doors in the GIS room, and they are installed one by one on the outer wall of each passage door of the GIS room, so as to promptly sound an alarm when the GIS room is in a dangerous state;

[0027] The control system includes an indoor controller and an outdoor controller; wherein,

[0028] The indoor controller is arranged in the GIS room, and is connected to the SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system and alarm system respectively; the indoor controller is connected to the SF6 monitoring system and the oxygen monitoring system to receive the SF6 exceeding standard alarm signal and the oxygen insufficient alarm signal sent by the two; the indoor controller is connected to the exhaust system to automatically control and start all the exhaust fans to ventilate the GIS room when receiving the SF6 exceeding standard alarm signal and the oxygen insufficient alarm signal; the indoor controller is connected to the infrared sensing system and the display system respectively, and when any infrared sensor detects that there is a staff within 1m of the passage door of the GIS room, the infrared sensor sends a signal to the indoor controller to start the passage door The electronic display screen is provided on the indoor controller. The electronic display screen displays the indoor gas status according to the signals sent in real time by the indoor controller to the SF6 monitoring system and the oxygen monitoring system. When the indoor controller does not receive the SF6 exceeding standard alarm signal, the display screen displays "SF6 concentration is normal". When the indoor controller receives the SF6 exceeding standard alarm signal, the display screen displays "SF6 concentration is abnormal". When the indoor controller does not receive the oxygen shortage alarm signal, the display screen displays "oxygen concentration is normal". When the indoor controller receives the oxygen shortage alarm signal, the display screen displays "oxygen concentration is abnormal". The indoor controller is connected to the alarm system so that when the SF6 exceeding standard alarm signal and / or the oxygen shortage alarm signal are received, the alarm is activated to sound an alarm.

[0029] The outdoor controller is arranged in the GIS outdoor wall electrical cabinet, which is connected to the alarm system and the exhaust system respectively to control the opening and closing of each alarm in the alarm system and the opening and closing of each exhaust fan in the exhaust system outdoors.

[0030] The specific working principle of the sulfur hexafluoride monitoring system is as follows:

[0031] The SF6 monitoring system and the oxygen monitoring system detect the SF6 gas concentration and oxygen gas concentration in the GIS indoor electrical cabinet in real time, respectively, and set to send out an SF6 excessive alarm signal when the SF6 gas concentration exceeds the set threshold, and send out an oxygen insufficient alarm signal when the oxygen content is lower than the set threshold; the SF6 excessive alarm signal and the oxygen insufficient alarm signal are sent to the indoor controller to drive the exhaust system to start ventilation and drive the alarm to start and sound an alarm, prompting the staff to monitor and handle; on the other hand, when the staff needs to inspect or repair the GIS indoor electrical cabinet, when the staff is close to any GIS room When the passage door is opened, the infrared sensor above the passage door detects the staff and sends a signal to the indoor controller to start the electronic display screen on the passage door. When the indoor controller does not receive any alarm signal, the electronic display screen displays: normal oxygen concentration, normal SF6 concentration; when the indoor controller receives any alarm signal, the electronic display screen displays: abnormal oxygen concentration and / or abnormal SF6 concentration according to the type of alarm signal; according to the prompt, the staff shall first use the outdoor controller to open the exhaust system for ventilation if the exhaust system does not open automatically, and then open the passage door to enter the GIS room for inspection and maintenance after the indoor gas environment is safe.

[0032] In this embodiment, the SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system, alarm system and controller are all commercially available products.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sulfur hexafluoride monitoring system, characterized in that: It consists of SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system, alarm system and control system; among them, The SF6 monitoring system includes a monitor and an SF6 gas electron capture detector installed in the cable layer of the electric cabinet in the GIS room, so as to monitor the SF6 gas concentration in the electric cabinet gas through the SF6 gas electron capture detector and send out an SF6 excessive alarm signal when the SF6 gas concentration exceeds the set threshold; The oxygen monitoring system is equipped with monitors and oxygen electron capture detectors at the cable layer of the electric cabinet in the GIS room to monitor the oxygen concentration in the gas in the electric cabinet through the oxygen electron capture detector and send out an oxygen deficiency alarm signal when the oxygen content is lower than the set threshold; The exhaust system consists of multiple exhaust fans, which are arranged side by side on the wall of the GIS room on one side of the outer wall; The infrared sensing system consists of multiple infrared sensors, which are installed one by one on the outer wall of each passage door of the GIS room to sense and detect the staff approaching the passage door of the GIS room; The display system consists of multiple electronic display screens, which are installed one by one on the outer wall of each passage door of the GIS room to display the monitoring results of the SF6 monitoring system and the oxygen monitoring system in real time; The alarm system consists of multiple alarms, which are installed one by one on the outer wall of each passage door of the GIS room to sound an alarm when the monitoring results are abnormal; The control system includes an indoor controller and an outdoor controller; the indoor controller is arranged in the GIS room, and is respectively connected to the SF6 monitoring system, oxygen monitoring system, exhaust system, infrared sensing system, display system and alarm system, so that when the indoor controller receives the SF6 exceeding standard alarm signal and / or the oxygen insufficient alarm signal, it starts the exhaust system and the alarm system; when the indoor controller receives the sensing signal of the infrared sensing system to the staff, it starts the display system to display the monitoring results of the SF6 monitoring system and the oxygen monitoring system; the outdoor controller is arranged in the GIS outdoor wall electrical cabinet, and is respectively connected to the alarm system and the exhaust system to control the opening and closing of the alarm system and the exhaust system.

2. The sulfur hexafluoride monitoring system according to claim 1, characterized in that: There are at least two SF6 gas electron capture detectors in the SF6 monitoring system, which are arranged at different positions of the cable layer of the GIS indoor electric cabinet.

3. The sulfur hexafluoride monitoring system according to claim 1, characterized in that: There are at least two oxygen electron capture detectors in the oxygen monitoring system, which are arranged at different positions of the cable layer of the electric cabinet in the GIS room.

4. The sulfur hexafluoride monitoring system according to claim 1, characterized in that: The exhaust system consists of four exhaust fans, which are arranged on the upper and lower sides of the wall respectively.

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