SF6 density relay transformation scheme- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

韦弗斯解决方案

应用案例

SF6安全保障专家

专注于SF6气体检测的专业化

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SF6 density relay transformation scheme

Because the SF6 gas density relay, like other pressure gauges, will have a certain drift in its alarm and latching values after a period of use, and the temperature compensation material will have a large error in the alarm and latching values due to aging and deformation of the material after a certain period of use. In addition, because the density relay contact action is not frequent, the contact action may be insensitive or ineffective. This hidden danger may directly lead to the failure to timely alarm or lock when the pressure in the SF6 switch drops to the alarm or lock value due to gas leakage, resulting in a major accident. Therefore, the SF6 gas density relay should be checked regularly.

220kV and 500kV booster station outdoor column circuit breaker (Beijing ABB supply) SF6 density meter is installed without disassembly online verification SF6 density relay three-way valve device, The installed non-disassembly inline check SF6 density relay three-way valve body contains a density relay check self-sealing port, check port protective plug cap, and valve operation switch. The three-way valve device (aluminum alloy and stainless steel can be selected by the user), through the addition of the non-disassembly check three-way valve, it can be easily verified in operation without disassembling the SF6 density relay (indicating value scale check, alarm contact action value check, locking contact action check). In order to meet the function of verifying the density relay without power failure and without disassembling the SF6 density table, it can also meet the operation of micro-water and decomposition detection and gas filling inside the gas equipment.

To collect the size data of each interface of the three-way valve device for the number of equipment to be reformed on site, the company dispatched relevant technical personnel to the site of Jiangyin Lidian Energy power plant and on-site work supervision personnel to fully cooperate with each other, survey and map the on-site calibration and transformation equipment and issue the relevant technical transformation implementation plan. Surveying and mapping mainly survey and collect information such as SF6 density relay interface, column type circuit breaker device body interface and installed three-way valve length, size and specifications, and verify the company's system database information before issuing relevant drawings, which are confirmed and signed by the user before processing and production.

There are 12 sets of ABB outdoor column circuit breakers (including transformers) in the 220KV switching station, a total of 36 ABB SF6 gas density relays need to be equipped with no-disassembly calibration three-way valves, and the interface specification is M30*2.0. There are 9 sets of ABB circuit breakers in the 550KV switching station that need to be equipped with SF6 gas density relays without disassembling calibration meter three-way valves, a total of 27 sets. The above total of 63 sets (the specific number of transformation needs to be further communicated with the user to determine) SF6 gas density relay interface, its interface specifications are M30*2.0.

Combined with the requirements of the user, it is planned to use the imported reinforced aluminum 6083 label, the integrated needle valve structure form, but the active interface on the side of the switchgear body is made of stainless steel to ensure that the combination of stainless steel and reinforced material is better, and stainless steel will not be as easy to oxidize as the brass material. Due to the increase in length and weight after the installation of three-way valves, long-term operation stability is considered. (User suggestion: After installing the three-way valve, add a fixed support frame under the valve body, the support frame can be fixed with 60*5mm thick galvanized flat iron, the length of about 52cm (550KV field measurement length), because the flat iron is similar to the color of the site, the distance between the site density meter interface and the installed flat steel is about 5.5cm, and the round hole U-shaped fastening bolt hole can be set. In order to adjust the fixed position of the fixed support.

Note: However, the installation of the support frame needs to be further communicated with the user to determine, because the installed three-way valve body can fully withstand the density relay and the weight of the three-way valve body itself and the normal external force factors.