110kv sulfur hexafluoride gas leakage monitoring device

Abstract

The utility model discloses a 110kv sulfur hexafluoride gas leakage monitoring device, which comprises a travel switch, an intermediate relay, an alarm device, a time relay, an alternating current contactor, an air switch of a fan control loop, and an alternating current contactor connected with an exhaust fan switch, the travel switch is arranged on a door of the 110kv sulfur hexafluoride gas high-pressure chamber; a first coil of the intermediate relay, a second coil of the time relay and an alarm of the alarm device are connected in parallel; the travel switch is connected in series with the first coil, the second coil and the alarm which are connected in parallel; and the air switch in a normally closed state, the normally open contact, the normally closed contact of the time relay and the alternating current contactor (KM) are connected in series. According to the utility model, the personal safety of personnel entering the GIS electrical room is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mine electromechanical engineering technology, specifically a 110kV sulfur hexafluoride gas leakage monitoring device. Background Technology

[0002] As the service life of 110kV high-voltage switchgear in coal mines continues to increase, the equipment failure rate is rising year by year, especially for critical equipment such as GIS (Gas Insulated Switchgear). GIS equipment is the source of the power supply system, and a failure in it constitutes a major accident. Currently, some 110kV substations use GIS double-busbar power supply systems, employing SF6 gas as insulation and arc extinguishing for high-voltage electrical switchgear. A failure in 110kV GIS equipment will cause gas changes, leading to volume changes in the 110kV sulfur hexafluoride gas-insulated metal-enclosed equipment. If not handled promptly, delays in fault handling could escalate the accident, causing a large-scale power outage and impacting mine production.

[0003] SF6 gas is a colorless, odorless, tasteless, and non-toxic inert gas with a density heavier than air. Pure SF6 is not toxic to humans, but it cannot sustain life. If SF6 gas is exposed to an atmosphere with an oxygen content of less than 19.5%, it can cause dizziness, coma, vomiting, loss of consciousness, and even death. More importantly, SF6 will partially decompose under the influence of a high-voltage electric arc. Its decomposition products, such as SF4, SOF2, SF2, SO2F2, and HF, are highly toxic and corrosive. Even a small leak can cause harm to people and damage to equipment.

[0004] The original device only triggered an alarm and activated the fan when the monitoring unit detected that the SF6 gas concentration or oxygen concentration was outside the normal range. However, Article 196 of the "Electric Power Safety Work Regulations" stipulates that personnel must ventilate the distribution room containing SF6 equipment for 15 minutes before entering. To meet this requirement, the alarm device needs to be modified.

[0005] Patent publication number CN102494857A discloses an automatic exhaust device for monitoring SF6 gas leaks in GIS equipment. The device includes an SF6 gas monitor and an AC contactor. The alarm signal output of the SF6 gas monitor is connected to a monitoring backend via an alarm output circuit. The coil of the AC contactor is connected to the alarm signal output of the SF6 gas monitor, making the AC contactor and the alarm output circuit connected in parallel. The normally open contact of the AC contactor is used to control the start and stop of the exhaust fan. However, in this patent, exhaust is only activated when the detected SF6 leak exceeds the standard value. Utility Model Content

[0006] The technical problem to be solved by this utility model is that the current SF6 gas leakage monitoring and exhaust device cannot meet the current engineering safety regulations.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A 110kV sulfur hexafluoride gas leak monitoring device includes: a limit switch SQ, an intermediate relay, an alarm device, a time relay, an AC contactor KM, an air switch QL for the fan control circuit, and an AC contactor KM connected to the exhaust fan switch;

[0009] Limit switch SQ is installed on the door of the 110kV sulfur hexafluoride gas high-pressure chamber; the first coil KA0 of the intermediate relay, the second coil KT0 of the time relay, and the alarm device BJ are connected in parallel; the limit switch SQ is connected in series with the parallel first coil KA0, the second coil KT0, and the alarm device BJ.

[0010] The normally closed air switch QL, normally open contact KA1, normally closed contact KT1 of the time relay, and AC contactor KM are connected in series.

[0011] In one embodiment of this utility model, the monitoring device further includes a PLC controller, a sulfur hexafluoride gas sensor, an oxygen sensor, and a temperature and humidity sensor; the sulfur hexafluoride gas sensor, the oxygen sensor, and the temperature and humidity sensor are installed in a 110kV sulfur hexafluoride gas high-pressure chamber and connected to the PLC controller.

[0012] In one embodiment of this utility model, the alarm device is connected to the PLC controller.

[0013] In one embodiment of this utility model, the alarm device includes a start button SA that controls the alarm switch BJ; the start button SA is connected in parallel with the first normally open contact KA1.

[0014] In one embodiment of this utility model, the PLC controller is connected to the start button SA.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This utility model utilizes the principle of physical measurement, and when personnel need to enter the GIS equipment room, the fan will start, which greatly improves the personal safety of personnel entering the GIS electrical room and complies with relevant safety regulations.

[0016] This utility model uses a limit switch, which is sensitive and reliable in action, has a wide range of applications, and can greatly improve personnel safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a 110kV sulfur hexafluoride gas leakage monitoring device according to an embodiment of the present invention. Detailed Implementation

[0018] To facilitate understanding of the technical solution of this utility model by those skilled in the art, the technical solution of this utility model will now be further described in conjunction with the accompanying drawings.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Please see Figure 1 As shown, this utility model provides a 110kV sulfur hexafluoride gas leak monitoring device, including a limit switch SQ, an intermediate relay, an alarm device, a time relay, an AC contactor KM, an air switch QL for the fan control circuit, and an AC contactor KM connected to the exhaust fan switch.

[0021] Limit switch SQ is installed on the door of the 110kV sulfur hexafluoride gas high-pressure chamber. The first coil KA0 of the intermediate relay, the second coil KT0 of the time relay, and the alarm device BJ are connected in parallel. Limit switch SQ is connected in series with the parallel first coil KA0, second coil KT0, and alarm device BJ.

[0022] The air switch QL, normally open contact KA1, normally closed contact KT1 of the time relay, and AC contactor KM are connected in series.

[0023] In this embodiment, when the door to the 110kV sulfur hexafluoride gas high-pressure chamber is opened, the normally open contact of the limit switch SQ is closed. At this time, the first coil KA0, the second coil KT0, and the alarm BJ are energized. The alarm BJ will verbally remind the staff, "The fan is on; please enter after 15 minutes." The air switch QL is normally closed. When the first coil KA0 is energized, the normally open contact KA1 closes, the AC contactor KM closes, and the exhaust fan starts. Simultaneously, the second coil KT0 is energized and starts timing, setting the exhaust fan's operating time to 15 minutes. The normally closed contact KT1 will open after a delay of 15 minutes, at which point the exhaust fan stops, and the staff can then enter the 10kV sulfur hexafluoride gas high-pressure chamber to perform their work.

[0024] For personnel frequently entering and exiting 110kV sulfur hexafluoride (SF6) high-voltage rooms, it is essential to anticipate SF6 leak points, leakage volumes, and oxygen content. According to the "Electrical Safety Work Regulations," the SF6 gas concentration in the air within work areas equipped with SF6 equipment must not exceed 1000 ppm. All SF6 gas users must install equipment with SF6 concentration and oxygen content alarm control functions to ensure dual protection for both SF6 electrical equipment and the personal safety of personnel.

[0025] In one embodiment of this utility model, the 110kV sulfur hexafluoride gas leak monitoring device further includes a PLC controller, a sulfur hexafluoride gas sensor, an oxygen sensor, and a temperature and humidity sensor. The sulfur hexafluoride gas sensor, oxygen sensor, and temperature and humidity sensor are installed in the 110kV sulfur hexafluoride gas high-pressure chamber and connected to the PLC controller. An alarm device is also connected to the PLC controller. Specifically, the alarm device includes a start button SA that controls the alarm switch BJ, and the start button SA is connected in parallel with the first normally open contact KA1. The PLC controller is also connected to the start button SA.

[0026] In this embodiment, a sulfur hexafluoride gas sensor, an oxygen sensor, and a temperature and humidity sensor collect the indoor environment of the 110kV sulfur hexafluoride gas high-pressure chamber. When the sulfur hexafluoride gas content, temperature, and humidity values ​​in the indoor working environment reach or exceed the set alarm values, or the oxygen content is lower than the set alarm value, the PLC controller closes the start button SA. At this time, the alarm BJ issues an alarm signal, and the circuits of the air switch QL, the start button SA, the normally closed contact KT1 of the time relay, and the AC contactor KM are connected, and the exhaust fan is turned on.

[0027] In this embodiment, since the 110KV high-voltage line is insulated with SF6 gas, when the gas leaks to a certain extent, it will cause the insulation to deteriorate and cause a short circuit. The data collected by the oxygen sensor and the temperature and humidity sensor are used to assist in the judgment of SF6 gas data.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] The above-described embodiments are merely examples of implementation methods of the utility model. The scope of protection of this utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model.

Claims

1. A 110kV sulfur hexafluoride gas leak monitoring device, characterized in that, include: Limit switch (SQ), intermediate relay, alarm device, time relay, AC contactor (KM), air switch (QL) for fan control circuit, AC contactor (KM) connected to exhaust fan switch; The limit switch (SQ) is installed on the door of the 110kV sulfur hexafluoride gas high-pressure chamber; the first coil (KA0) of the intermediate relay, the second coil (KT0) of the time relay, and the alarm (BJ) of the alarm device are connected in parallel; the limit switch (SQ) is connected in series with the first coil (KA0), the second coil (KT0) and the alarm (BJ) connected in parallel. A normally closed air switch (QL), a normally open contact (KA1), a normally closed contact of a time relay (KT1), and an AC contactor (KM) are connected in series.

2. The 110kV sulfur hexafluoride gas leakage monitoring device according to claim 1, characterized in that, The monitoring device also includes a PLC controller, a sulfur hexafluoride gas sensor, an oxygen sensor, and a temperature and humidity sensor; the sulfur hexafluoride gas sensor, oxygen sensor, and temperature and humidity sensor are installed in a 110kV sulfur hexafluoride gas high-pressure chamber and connected to the PLC controller.

3. The 110kV sulfur hexafluoride gas leakage monitoring device according to claim 2, characterized in that, The alarm device is connected to the PLC controller.

4. The 110kV sulfur hexafluoride gas leakage monitoring device according to claim 3, characterized in that, The alarm device includes an activation button (SA) that controls the switch of the alarm (BJ); the activation button (SA) is connected in parallel with the first normally open contact (KA1).

5. The 110kV sulfur hexafluoride gas leakage monitoring device according to claim 4, characterized in that, The PLC controller is connected to the start button (SA).

Images