SF6 Density Meter Transformation Service- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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SF6 Density Meter Transformation Service

You may also have encountered the following problems!

SF6 gas density relays are mainly used to monitor and control the density of SF6 gas in sealed containers. Generally used in high voltage switch (GIS/PCB), medium voltage switch (CGIS), gas insulation equipment, high voltage cable (GIL), inflatable transformer and transformer (CT/PT). It is actually a pressure gauge or pressure switch with live contact and temperature compensation, and its classification is mainly:

According to the difference of compensation principle, it is divided into: compensation plate type and relative cavity type;

l According to the appearance of the difference is divided into: pointer type and non-pointer type two;

According to the difference of vibration resistance method, it is divided into: oil-free type and oil-filled type;

According to the difference of pressure test methods, it is divided into relative pressure type and absolute pressure type.

Because the SF6 gas density relay like other manometers after a period of use, its alarm and lock value will produce a certain drift; In addition, because the contact action of the density relay is not frequent, the contact action may be insensitive or ineffective. If not inspected, there is a security risk. Density relay quality problems exist for the following reasons:

The vibration resistance of itself is not enough, after the strong impact of the switch closing, the pointer is stuck, the contact will never fail (no action or always action), and the deviation exceeds the standard.

Due to oil leakage, its vibration resistance is reduced, and after the strong impact of switching and closing, the pointer is stuck, the contact will never fail (no action or always action), and the deviation exceeds the standard.

Because the commonly used relay contacts are magnetically assisted electrical contacts, the contact closing force is small, the time is slightly longer, and the contact will be blocked or the contact is unreliable when the contact is oxidized. For the oil-free type, magnetically assisted electric contact contacts are exposed to air and are very prone to oxidation or dust accumulation.

l the contact is easy to contact poor or impassable; For the oil-filled type, the magnetic-assisted electric contact contact is immersed in silicone oil, but for a long time, after several moves, its contact performance will decline, and the oil film has an insulating effect, and the contact will also be poor or blocked.

Due to its own manufacturing quality problems, there is inaccurate temperature compensation, and the error is seriously large (overcompensate or undercompensate).

Due to insufficient aging or material problems, after a long time, it will drift, and the accuracy will be seriously large (the stress is not eliminated).

Due to design defects, there will be failure at low temperatures (never operate).

Due to design defects, the action and display value will be seriously degraded at high temperatures.

l For relative cavity density relays, due to internal or external reasons, the standard cavity will leak air, there is a large error in the operation value or failure.

l Due to severe vibration during transportation, the relay will fail and the accuracy will deteriorate.

Due to the quality of the components, the time is slightly longer, which may cause relay failure and poor accuracy.

Because the housing vent is not loosened, or the housing sealing problem, the internal pressure of the housing changes, so that the accuracy changes.

l Due to the erosion of rain or corrosive gases, the relay will fail and the accuracy will be poor.

Due to improper use, it will also affect the use (poor installation position).

Due to process problems, the density relay will fail, or the accuracy will be poor.

Due to the switch factory or relay in order to reduce costs, the selection of inferior products or components.

Electrical performance: insulation problems.

l Sealing performance.

WINFOSS is a long-term strategic partner with EMD of Italy and TRAFAG of Switzerland. In Europe, WINFOSS has provided calibration and custom services for SF6 density relays in more than 3,000 substations in more than 30 countries.

WINFOSS aims to provide power users with a full range of solutions from density meters to calibration services, engineering modifications and spare parts. And fully consider the technical parameters and requirements of China's electricity market to solve the different needs of different users.

Verification basis: The former Guodian Company attached great importance to the regular inspection of SF6 gas density relays. DL/T596-1996 "Preventive Test Procedures for Power Equipment" and the National Energy Administration "Twenty-five Key Requirements for the Prevention of Power Production Accidents and the preparation of interpretation" 13 "to prevent GIS, switchgear accidents" article 13.1.6, the State Grid Company "State Grid Company" eighteen major anti-accident measures of the power grid "revised version The connection between the sulfur hexafluoride density relay and the switchgear body in Item 12.1.1.6 of "Preventing GIS and Switchgear Accidents" must meet the requirements that the parity density relay is not disassembled.

The original Guodian Company issued on September 28, 2000, "25 Key Requirements for Preventing Major Accidents in Power Production" :

16.10 Give full play to the role of SF6 gas quality supervision and management, should do a good job of new gas management, operating equipment gas monitoring and abnormal situation analysis, monitoring should include SF6 pressure gauge and density relay regular calibration.

And the actual situation of calibration in recent years is summarized as follows:

The report after testing by Qinghai Pilot Test Institute shows that the failure rate of SF6 density monitoring device used by domestic switches more than 3 years of operation is more than 30%, there are serious safety risks, and safety accidents frequently occur.

The latest information from Qinghai Pilot Institute: The institute verified a batch of density relays produced by a domestic manufacturer in June 2007, and the pass rate was surprisingly low (51 only 3 qualified).

According to the Technical supervision Briefing (thermal engineering) of Fujian Electric Power Company, the 67th issue reported: 94 were checked, 23 were unqualified, and the unqualified rate was 24.4%.

"High Voltage Electrical Appliances" reported: Anhui Huaibei Bureau a 35KV switch due to density relay failure, air leakage and opening caused by the switch explosion.

In 2006, a 35KV switch in Qujing, Yunnan Province exploded due to the failure of density relay and air leakage.

What problems can we solve?

1.SF6 density relay calibrator: automatic intelligent SF6 gas density relay calibrator with MAX5H kernel technology. The calibrator adopts embedded microprocessor and fully enclosed SF6 gas circulation system, which can verify the performance of various SF6 gas density relays, normal temperature pressure gauges and P20 pressure gauges. The calibrator can be used for the production, maintenance and monitoring of SF6 gas products, especially for the power system, and provides convenience for the production and safe operation of SF6 density relays. It can support two kinds of calibration methods, online and offline laboratory, and adopt self-provided high energy

Two energy options, battery and external charging interface, make the user's field application more flexible.

2. Technical transformation services of reserved check interface: After investigation, SF6 electrical equipment without reserved check interface is also widely available in China's power market (especially in Yungui, Guangxi and Guizhou provinces of Southern Power Grid and local areas such as Sichuan, Chongqing, Shaanxi and New regions of State Grid). When this equipment periodically checks the density relay, it is necessary to power off the involved line, and then remove the density relay from the three-way valve connection, and then carry out on-site or back to the laboratory for verification on the calibration instrument, and install it again in the original position after passing the verification, and then use the SF6 gas leak detector to detect the installation position. This operation has the following disadvantages:

l Power failure of the line, and the power failure may be a long time, there will be certain economic losses;

Disassembly and installation of the density relay is relatively time-consuming, and it is easy to cause certain damage to the sealing surface and rubber ring at the connection during operation, increasing the risk of air leakage;

The calibration valve is generally connected to the air filling position of the original three-way valve. In the subsequent periodic calibration process, the calibration can be realized without power failure and disassembling the density relay, which greatly saves time, manpower and financial resources.

3. Provide SF6 density relay calibration service: Provide users with real-time, on-site and actual SF6 density relay professional calibration service. Users who cooperate with WINFOSS can trigger the service regularly or in real time, and WINFOSS professional service engineers carry out on-site calibration work. And by WINFOSS engineers issued verification report and site marks, for the maintenance of users to provide the most powerful decision-making basis.

4. SF6 density relay spare parts supply (including the custom of dense tank density relays) : Due to the years of use of SF6 density relays, especially a considerable number of density relays are still operating in outdoor environments. Affected by various factors such as climate environment, material aging or equipment maintenance, WINFOSS will provide users with sufficient spare parts support for SF6 density relays found to be poor after verification. Can cover ABB, SIEMENS, ALSTOM, AREVA, SETOM, HOLLEM, AKD, TOSHIBA and a variety of high voltage equipment on the replacement or custom applications.

5.SF6 density relay rain cover customization and replacement: Due to the aging and damage of outdoor environment and maintenance on rain cover, WINFOSS provides users with relevant accessories in the process of density relay verification, replacement and technical transformation. To provide users with more comprehensive services and value.

Why choose WINFOSS?

Professional value: 30000

For more than 20 years, WINFOSS has always stood at the forefront of the world's professional gas detection technology to promote the development of intelligent power and safety governance, to provide customers with a large number of high-quality engineering and services, so far, WINFOSS services have provided service support for more than 30,000 customers at home and abroad. Professional management to achieve the best cost, professional advantages to provide the most powerful protection, professional management for customers to continue to create value.

Technical value: 20+40

Relying on WINFOSS more than 20 years of technical precipitation and development, synchronized with Swiss power more than 40 years of research and development, design, manufacturing of technical advantages and experience accumulation, the formation of WINFOSS services the most powerful professional and technical competitiveness. "Focus, profound, excellent", WINFOSS service attaches great importance to the training and growth of the service engineer echelon, regular professional skills training and skills competition activities, making WINFOSS service team technical quality always in the forefront of the industry.

Network value: 100+300

WINFOSS service is Switzerland's largest, most complete service network, service technology strength of the strongest power testing service provider, with 100 service outlets, 300 service engineers. Service is "people-oriented". WINFOSS Service company headquarters embodies a wealth of human resources and technical strength, with professional product service engineers, system design engineers, software development engineers, system maintenance engineers, technical training instructors. At the same time, each service network brings together a variety of products, experienced, well-trained professional service personnel, strong technical force, and unified training, unified service specifications, unified management, unified assessment, to achieve professional staff on the job, to provide customers with high-quality service.

Resource value: 2000+3000

WINFOSS service continues to build a service hardware resource platform, comprehensive service tools and equipment, and better guarantee the professionalism and accuracy of on-site commissioning and maintenance services from tangible equipment. WINFOSS Service Relying on WINFOSS spare parts service network around the world, you can guarantee the reliable quality of special or original spare parts. WINFOSS service headquarters has spare parts warehouse, inventory spare parts worth more than 30 million yuan, spare parts stock is sufficient, each service network has different levels of spare parts storage, in order to provide customers with the first time the main spare parts response service.

Caring value: 7×24

"Mobile, fast, high quality" is the professional quality that WINFOSS service has long upheld and formed. WINFOSS service engineers provide fast expert support services for your power detection system around the clock. The first time of telephone support, 7×24 hours uninterrupted full service care, web-based remote diagnosis and maintenance and perfect CRM (customer service management system), the maximum close to customers, more detailed to meet the real-time needs of customers.

WINFOSS China: 3+7

WINFOSS came to China to provide comprehensive SF6 testing and supporting professional services for China Power, and will devote itself to the sales of hardware products in 3 years, and establish a comprehensive service network and team in 7 years to meet the needs of Chinese localization. Compared with Northern Europe, China's power equipment is more extensive, the climate environment is more complex, the urgency of aging equipment is more severe, and the type and quality of equipment is more uneven. Therefore, WINFOSS has a more difficult mission to complete in China, and can provide more abundant, more comprehensive and more professional value for Chinese power users.