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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
SF6 density relay shift and install SF6 density re
01. Project background (omitted)
Because I do not know the specific application project, I cannot explain the main background of the project.
The 220kV booster station of SF6 density relay procurement tender technical specification of Xizang Boyuan Comprehensive Energy Service Co., Ltd. involved in the project uses nine intervals of outdoor column transformers produced by *** manufacturers, nine intervals of Siemens outdoor column circuit breakers, and a total of 40 density relays. Due to the earlier age of the equipment, No reliable and convenient check density relay interface was set before, and the installation height was isolated, which was not easy to read the meter and could not meet the function of online check SF6 density relay without disassembling the density meter. Therefore, it was necessary to transform it and install the non-disassembling check density relay three-way valve device.
SF6 gas density relays are widely used in the power industry, but in the daily maintenance and overhaul process, there are the following problems:
1. The early column switch was affected by the process and structural design, and the SF6 gas density relay was generally installed in a high position, which led to the need to use an auxiliary platform for daily on-site meter reading, which was very inconvenient, and the accuracy of meter reading was affected by the deviation of the line of sight Angle.
2. Even GIS (gas insulated combined electrical equipment) and even indoor GIS, especially high voltage level equipment, still have the above inconvenience caused by high installation location.
3. In the early SF6 gas density relays, there was no disassembly free three-way valve and other structures between them and the device body interface, which led to frequent disassembly and assembly during meter calibration, which greatly affected the efficiency of meter calibration and maintenance, especially the reliability of equipment interface. According to Article 13.1.6 of the "25 Key Requirements of the National Energy Administration on Preventing power Production Accidents" (National Energy Safety (2014) No. 161), the connection between the sulfur hexafluoride density relay and the switchgear body should meet the requirements of not disassembling the check density relay.
Therefore, this scheme solves the above problems well by using different transformation forms for different SF6 high-voltage electrical structures.
02. Project implementation
4. In this scheme, the interface is updated and reformed, and the three-way valve device of SF6 density relay for online verification without disassembly is installed, and the connection link is adapted according to the interface characteristics of the product, so as to meet the requirements of verifying density relay without disassembly in operation; Because the density relay works outdoors, if there is no rain cover for the density relay, a rain cover device is added to solve the impact of external rain and dust on the density relay, improve the working environment of the density relay, and extend the service life of the density relay. After the installation and renovation is completed, calibration personnel can be arranged to carry out on-site testing and calibration of all SF6 density relays according to the requirements of the power plant, and submit the calibration report.
The added non-disassembly on-line check SF6 density relay three-way valve device includes a density relay check self-sealing interface, a check interface protective plug cap, a valve operating switch and an interface corresponding to the switch body, and an integrated pin three-way valve device for mounting the density relay interface. The three-way valve device (aluminum alloy material, brass material and 316 stainless steel material can be selected by the user), through the installation of non-disassembly check three-way valve device so that it can be easily calibrated in operation without disassembling SF6 density relay (indicating value calibration, alarm contact action value calibration, locking contact action calibration). 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.
Formulation of specific construction plans: The Technical service engineering department of Wevers Company arranges fully qualified professional and technical personnel to go to the site together with relevant on-site personnel to collect data on the manufacturers of production equipment such as transformers, circuit breakers and density meters that need to be reformed, the number that needs to be reformed, and the specifications and dimensions of each interface of the three-way valve device that needs to be installed. At the same time, the interface of the on-site calibration and renovation equipment was mapped and the relevant technical transformation implementation plan was issued. Surveying and mapping mainly surveys and collects information such as SF6 density relay interface, column type circuit breaker device body interface and installed three-way valve length, size and specifications, and verifies the company's system database information before issuing relevant drawings, which are processed and produced after being confirmed and signed by the user, and then on-site installation and other work are carried out during the planned power outage maintenance period of the power plant.
03 Technical Performance
No disassembly check SF6 density relay three-way valve control device is to install a combined valve with a breaking device through the SF6 density relay interface on the switch without changing any structure of the switch. The valve is provided with a connector for the original SF6 density relay interface, a SF6 density relay connector, a breaking device and a connector for connection with a special SF6 density relay calibrator. After the connection is made according to the design requirements, the gas path of SF6 density relay and the gas path of switch body can be realized by rotating the breaking device. When it is necessary to verify the SF6 density relay, it is necessary to rotate the breaking device on the valve body to the closed state, and then complete the connection between the calibrator interface and the calibration interface reserved on the valve body, so as to realize the calibration of SF6 density relay, which can greatly save the precious time of maintenance personnel. It can also greatly reduce the risk of SF6 gas leakage due to regular verification disassembly.
Functional characteristics
l Compatible with various specifications of switching interfaces at home and abroad;
l Convenient for SF6 high voltage switch density relay calibration, inflation, water, decomposition, purity measurement;
l Manual valve operation is simple and flexible, status identification is clear, designed with operation lock mechanism, prevent misoperation;
l Valve body made of stainless steel or brass, user optional;
l Valve body internal charging pressure > 0.1MPa high pure nitrogen.
Technical index
l Pressure rating: PN68;
l Sealing performance: absolute air leakage rate ≤1×10-9Pa.m3/s;
l Sealing form: metal hard seal or O-ring seal according to different switch objects to determine;
l Impact resistance :600m/s2, impact time: 11ms;
l Corrosion environment test: IEC60068-2-11 standard test;
1. Service life: 100000 times (number of switching of valve control device);
Material structure: 59-1 copper or 316L stainless steel or 6083 imported aluminum three materials available;
l Three-way valve material: All kinds of materials have oxidation resistance and corrosion resistance.
l Leakage test: leakage rate <10-9MPa.m3/s;
l Anti-riot pressure test: under 4 times PN, the valve is normal;
l Structure: ball valve or needle valve optional;
Impact vibration test: after 10000 times of impact, the leakage value is less than 1×10-8mbar*l/s;
l Rotation test: installation rotation test for the thread 600 times, without any change in the thread;
Interface specifications: Depending on the field mapping of different switches, Weavers has a database of all switches;
l Connected trachea for related tests, test content;
l Ambient temperature: -40 ~ +85℃;
Functional features:
1. Convenient for SF6 high voltage switch density relay calibration, inflation, water, decomposition, purity measurement;
2. The manual valve operation is simple and flexible, and the status mark is clear;
3. The valve body is made of stainless steel or brass or reinforced aluminum alloy, user optional;
4. The pressure inside the valve body is > 0.1MPa high pure nitrogen.
5. Compatible with various specifications of switching interfaces at home and abroad;
6. Ambient temperature: -40 ~ +80℃.
05, follow the technical standards
l Comply with national or industry technical standards:
l SF6 General specification for calibration of gas density relays and density meters JB/T10549.
l Pressure type sulfur hexafluoride gas density controller GB/T22065.
l Verification regulation of pressure type sulfur hexafluoride gas density controller JJG1073.
l General pressure gauge GB/T1226.
l Electric contact pressure gauge JB/T9273.
l Electrical relay GB/T11287 (idt IEC60255).
l Enclosure protection grade GB4208 (eqv IEC60592).
l Electromagnetic compatibility GB/T17626 (idt IEC60592).
l Basic test methods for relays and devices GB/T7261.
l Industrial automation instrument JB/T9253.
l Technical conditions for the packaging and transportation of relays and devices JB/T7828.
l Electrical installation engineering high voltage electrical equipment construction and acceptance code.
l Sulfur hexafluoride electrical equipment operation, testing and maintenance personnel safety protection rules DL/T639.
Code DL/T603 for Operation and Maintenance of gas insulated metal enclosed switchgear.
The applicable national standards and industry standards are as follows (if there is a newer version, it will be implemented in accordance with the new standard) :
01. Verification Procedure for sulfur hexafluoride Gas Density Relays DL/T 259-2012
02. "Sulfur hexafluoride in electrical equipment gas management and detection guidelines" GB/T 8905-2012
03. Code for Design of Power Supply and Distribution System GB50052-2009
04. "High voltage Test equipment General Technology Part 6" DL/T846.6-2004
05. "High Voltage Switchgear Anti-accident Technical Measures" Guoxinfa [1999]72
06. "25 Key Requirements for Preventing Power Production Accidents" National Energy Safety [2014] No. 161 and State Grid "18 Major Anti-accident Measures of State Grid Corporation"
07. GB11022 "High voltage Switchgear general technical Conditions"
08. DL/T 596-2005 "Electrical Equipment Preventive Test Code"
09. GB1984-2003 "High voltage AC Circuit Breaker"
10. GB/T8905-1989 "Guidelines for Gas Management and Monitoring in sulfur Hexafluoride Electrical Equipment"
11. State Grid "Measures to Prevent AC High-voltage Switchgear Accidents"
12. State Grid "110 (66) KV-500KV AC high voltage Circuit breaker maintenance Code"
13. State Grid "High Voltage Switchgear Operation Code"