SF6 density relay on-line calibration device

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

135 85763546

Huaneng Chongqing Liangjiang Gas Turbine Power Gen

Project profile

Huaneng Chongqing Liangjiang Gas Turbine Power Generation Co., LTD. 500kv booster station is located in Liangjiang International Cloud Computing Industrial Park, Land and Water High-tech Industrial Park, Liangjiang New Area, Chongqing, about 23km north of Chongqing's main urban area, under the jurisdiction of Chongqing Liangjiang New Area. The site area is a subtropical warm and humid monsoon climate area, deep inland, mild climate, abundant rainfall, high humidity, more clouds, less sunshine. Spring warms up early, summer is long and hot, autumn is rainy, winter is not cold. Site area pollution level This equipment should be considered as 31mm/kV. Each generator set of our company is connected to 500kV outdoor GIS in the form of a 580MVA three-phase double-coil boost transformer. The main transformer and 500kV outdoor GIS are connected by 500kV high voltage overhead line. The 500kV wiring system is three-half wiring, and the generator outlet is equipped with circuit breakers; The power plant has two 500kV outgoing lines and is connected to 500kV Siyuan substation. The station is a complete set of combined GIS equipment from Xiamen ABB High Voltage Switch Co., LTD. All chamber density relays are Trafag products from Switzerland, and SF6 gas pressure gauges are Dilo products from Germany, which are currently in good working condition.

Huaneng Chongqing Liangjiang Gas Turbine Power Generation Co., LTD. 500kv boost station GIS circuit breaker installed SF6 density relay online calibration device, in order to meet the National Energy Administration issued in 2014 "Twenty-five Key Requirements for Preventing Power Production accidents" “ Prevention of GIS and switchgear accidents stipulated in Article 13.1.6, the connection mode between SF6 density relay and circuit breaker body shall meet the requirements of not disassembling check density relay” .

To meet the requirements for on-site installation and application, the impact of the size, structure, and weight of the new device on the existing GIS device and density relay is considered to ensure that routine inspection, regular maintenance, and safe and stable operation of the device are not affected after the transformation. Based on the actual situation of the GIS equipment on site, different installation modes (45 degrees, 90 degrees, 180 degrees, etc.) for SF6 density relay verification three-way valves are selected according to different installation positions, so as to facilitate the inspection and observation of the density relay during daily maintenance.

Weavers provides an additional SF6 density relay check three-way valve with self-sealing function to facilitate SF6 density relay failure replacement and reserve an SF6 gas micro-water detection connection. It is convenient for subsequent on-line calibration of density relays and micro-water testing, as well as recharge of the equipment cavity.

SF6 density relay online calibration device in line with pressure level: PN64; Sealing requirements: the spool is metal sealed (oxidation resistance, corrosion resistance) Sealing performance: leakage rate <10-15MPa.m3/s; Impact resistance :600m/s2, impact time: 11ms; Material: Valve body is metal alloy, laser integrated gold-plated needle valve structure, anti-riot pressure test: under 4 times PN, the valve is normal; Impact test: After 10000 times of impact, the leakage value is less than 1× 10-8mbar*l/s; Rotation test: installation rotation test for thread 500 times, without any change in thread; Corrosion environment test: IEC60068-2-11 standard test three-way valve Material requirements: anti-oxidation, anti-corrosion interface: GIS ABB circuit breaker special interface; Protection class: IP65; Service life: 5000 times or more (on-line detection of valve switching times).

Weavers service personnel applied bandaging method to the 55 SF6 density relays online calibration devices installed in each air chamber. After standing for 24 hours, the high-schedule SF6 quantitative leak detector was used to detect all aspects of SF6 air chamber one by one, and each gap and gasket were detected and investigated one by one. No leakage was found, which met the operation requirements.