- sales@hvtesters.com
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- sales@hvtesters.com
- +8613661908522
SF6 testing
As a manufacturer of SF6 test instruments, Rui Du focuses on the design and production of high-precision electrical equipment. With many years of export experience, we have provided high-quality equipment to over 50 countries. Not only do we have our own branded products, but we can also customize production according to your specific needs. You can learn more about the products below. If you have any special requirements, please feel free to contact us, and we will provide you with professional pre-sales and after-sales services.
What Is SF6 Test Instrument ？
In power systems, testing of SF6 gas is critical to ensure the safety of operators and to protect equipment from damage. By taking a sample of SF6 gas from the equipment, it is possible to verify that the state of health of the gas and equipment is within acceptable limits. Common SF6 gas tests include moisture content testing, purity testing, and decomposition product testing. Excessive moisture content can lead to corrosion of electrical equipment, and SF6 analyzers can measure the moisture content in gas samples. Gas purity has a significant impact on the arc performance, insulation strength and life of electrical equipment. Among the techniques used in power systems to detect internal faults in SF6 electrical equipment, testing for SF6 gas decomposition products is a feasible and effective method.
What are advantages of SF6 Test Instrument ?
Reliable sensor performance
The sensors all adopt high-quality imported sensors with reliable performance and long-life design, which ensures the accuracy and reproducibility of the measurement results.
Rich testing functions
Covering fault location, routine testing, gas purification, filter monitoring, high-voltage contact fault checking, SF6 purity testing
Humanized design
Color LCD touch screen display, humanized appearance, easy to operate.
Good long-term stability
Accurate and reliable measurement within the full range of the instrument, good long-term stability and repeatability.
Types of SF6 Test Instrument
SF6 Gas Purity Tester
The SF6 gas purity analyzer is an ideal portable tool for detecting SF6 gas leakage in power plants and substations. It is not only suitable for the routine monitoring of SF6 gas purity in power facilities but also plays a role during the gas replacement process when generators are started up or shut down. Additionally, the analyzer is highly effective in precise measurement of specific gas purity in industries such as metallurgy, chemical fiber, and petrochemical. The use of the SF6 gas purity tester is crucial for ensuring the quality of SF6 gas and the safe operation of equipment. Our tester is easy to operate and capable of accurately measuring the purity of SF6 gas, thereby ensuring the accuracy and reliability of gas flow.
SF6 Micro Water Tester
In high voltage applications, SF6 gas is vital as an insulating medium. However, under the sustained action of electric arcs and coronas, SF6 may react with water vapor to produce corrosive hydrofluoric acid and toxic fluorides, which pose a serious threat to equipment and could potentially trigger explosions, endangering personnel safety. Additionally, an excessive micro-water content in the SF6 gas within the equipment can lead to the condensation of water on the equipment’s surface, reducing its insulating properties and impacting the stability of the power supply. To address this issue, we have developed an SF6 intelligent micro-water tester that employs high-precision imported humidity sensors and advanced digital circuit control technology, ensuring accurate measurement results and the reliability of the instrument.
SF6 Gas Leak Detector
The SF6 quantitative leak detector is an essential testing tool designed specifically for high-voltage SF6 equipment, primarily used for accurate quantitative measurement of gas leaks and rapid identification of leak points within the equipment. In the field of power equipment manufacturing, this leak detector has become the standard safety device for detecting toxic gas leaks, while in power plants, it serves as a crucial means of ensuring the normal operation of power switches. SF6 gas, as a colorless and odorless insulating medium, is of vital importance in high-voltage environments. Therefore, the SF6 gas leak detector plays a crucial role in ensuring no leakage in high-voltage equipment, maintaining production safety, and protecting the health of personnel, making its contribution truly significant.
SF6 Decomposition Products Tester
The SF6 Decomposition Products Tester is capable of quickly and easily detecting the decomposition products of SF6 gas under varying temperatures and pressures, aiding inspectors in promptly identifying early-stage faults within equipment. By simultaneously monitoring the key decomposition products SO2 and H2S, the SF6 Decomposition Products Tester can rapidly detect and diagnose early faults within the equipment on-site, ensuring the safe operation of SF6 electrical equipment in industries such as power, railway, metallurgy, and petrochemical. The tester is suitable for a range of applications including fault location, routine inspections, and partial discharge monitoring, playing a significant role in detecting internal solid insulation faults in SF6 electrical equipment, such as circuit breakers, transformers, GIS, and bushings. The use of this instrument is of great importance for ensuring equipment integrity and preventing potential safety threats.
SF6 Vacuum Charging Device
The SF6 gas evacuation, purification, and charging device is a commonly used piece of equipment that efficiently removes impurities and moisture from SF6 gas, thereby enhancing the purity and pressure level of the gas to ensure the stable and safe operation of the power system. The device consists of components such as a vacuum pump, circulation pump, dryer, and filter, and through a series of operational steps, it achieves the evacuation, purification, and charging of SF6 gas, significantly improving the quality of the gas. This device is applicable for the maintenance and保养 of various high-voltage power facility equipment, playing a critical role.
SF6 Gas Recovery And Purification Unit
The SF6 gas recovery, purification, and charging system is designed specifically for the manufacturing, application, operation, and maintenance, as well as research of SF6-insulated electrical equipment. The system is compatible with SF6 electrical appliances and GIS combined electrical appliances of various voltage levels, capable of not only charging SF6 gas into these devices but also recovering it from equipment during use or testing, followed by efficient purification and compression. Given the high cost of SF6 gas and its potential to produce harmful decomposition products under conditions of electric arcs, sparks, and corona discharge, ensuring the recovery and utilization of SF6 gas is particularly crucial. Therefore, the SF6 gas recovery, purification, and charging system has become an indispensable professional tool for gas management during the production and maintenance of SF6 electrical equipment.
Application of SF6 Test Instrument
Power Industry
In transmission and distribution systems, SF6 gas is widely used as an insulating medium and arc quencher. The portable SF6 comprehensive tester is capable of accurately measuring and analyzing SF6 gas to ensure the safe operation of power equipment.
Industrial Manufacturing
Many industrial processes utilize SF6 gas, such as semiconductor production and casting. The portable SF6 comprehensive tester can be used to detect the concentration of SF6 gas in the production environment, ensuring the health and safety of workers.
Mining and Chemical Industry
In the mining and chemical sectors, SF6 gas is used as a refrigerant and insulating medium. The portable SF6 comprehensive tester can conduct real-time monitoring of SF6 gas concentrations in the workplace, preventing potential safety hazards.
Environmental Protection
SF6 gas is a potent greenhouse gas with a negative impact on global warming. The portable SF6 comprehensive tester helps environmental departments monitor and control the emission of SF6 gas, reducing its environmental impact.
How to maintain SF6 Test Instrument ?
Environmental conditions
Do not work alone or in explosive gas, steam or high dust environment.
Voltage check
Before testing, make sure that the tester voltage display is not higher than 36V.
Power off of the product under test
Confirm that the tested device is in a power-off state. This instrument is not allowed to be used to test live device.
Voltage range determination
Confirm that the withstand voltage of the tested device is within the output voltage range of theselected test gear.
Components of SF6 Test Instrument
Outside case
Charge interface
USB interface
Touch colorful screen
Function selection button
Measurement range selection switch
Compared with traditionalSF6 Test Instrument , our this product
01/ High-precision sensors
Uses high-performance imported sensors, including humidity, purity, SO2, H2S, CO and other sensors, as well as mass flow sensors and temperature sensors, to ensure the authenticity and reliability of the sampling data and the fast calculation speed.
02/ Multifunctional integration
The device integrates multiple functions such as real-time measurement, curve display, power management, time system, file system, data query, data printing, etc., combined with a user-friendly operation interface, making it more convenient to use and more functional.
03/ High sensitivity and stability
The product has high sensitivity and good stability, can effectively resist pollution and interference, and ensures stable operation in various environments.
04/ Lightweight design, intuitive display
The tester is small, beautiful and easy to carry. It is equipped with a large-screen color LCD display and intuitive curve display function, which makes it easy for users to quickly read and analyze data.
FAQ
Q: How do you test for SF6 gas purity?
A: Three standard procedures are typically employed to evaluate the purity of SF6 gas: utilizing a handheld analyzer for on-location testing, conducting laboratory tests, and implementing continuous online monitoring. The selection of the testing approach is dictated by the manufacturer’s specifications, regulatory or industry standards, and other relevant criteria.
Q: What is the quality of SF6 gas?
A: The characteristics of SF6 gas are that it serves as an outstanding electrical insulator while possessing superior arc suppression capabilities. These attributes make SF6 ideal for use in gas-insulated switchgear, electric power equipment like busbars, and medium to high voltage switchgear applications, as well as in gas-insulated transmission lines (GIL).
Q: What is the dew point test for SF6?
A: The dew point test for SF6 measures the temperature at which water vapor within the gas starts to change phase into liquid water or ice. This is critical in SF6-filled equipment, where the standard dew point typically falls between -60°C and -5°C. The test is usually conducted at operating pressures ranging from 100 to 755 kPa absolute.
Q: What is the moisture limit for SF6?
A: The moisture content in SF6 gas is regulated by various standards. According to IEC 376, the maximum allowable moisture level for new gas filling into gas-insulated equipment (GIE) is set at 120 parts per million by volume (ppmv) with a dew point of -40 °C. In contrast, the American standard ASTM D2472-92 sets a stricter limit at 71 ppmv with a dew point of -45 °C. Generally, pure SF6 gas has minimal moisture content. Most SF6 gas producers adhere to a moisture limit of -60 °C dew point.
Q: What is the difference between density and pressure in SF6?
A: The key difference between SF6 density and pressure measurements lies in their functionality. Density relays for SF6 have safety contacts for alarms and shutdowns, which pressure gauges usually don’t. Density reflects the mass per unit volume of SF6, while pressure indicates the force the gas exerts on its container.
Q: How to check SF6 gas leakage?
A: To identify SF6 gas leaks, a technique similar to the one used for detecting car tire leaks can be utilized. Mix a solution of water and a small amount of liquid dish soap, and transfer it to a spray bottle. Spritz the mixture on potential leak points like joints, conduits, or any suspect surfaces. If a leak is present, you’ll see bubbles emerging from the area.
Q: What is the principle of SF6 leak detector?
A: The operating principle of an SF6 leak detector relies on the high-voltage ionization method. This sniffing tool is designed for single-hand operation, making it convenient for pinpointing minor SF6 gas leaks. The detection data is visually communicated through an LED screen, and an audible alert function notifies the operator of any SF6 leaks detected.
Q: What happens when SF6 gas leaks?
A: When SF6 gas escapes, it can lead to certain issues due to its physical properties. Although it has applications in medical imaging, SF6 is denser than air and can accumulate in lower-lying spaces, potentially reducing the oxygen concentration in those areas. This displacement of oxygen can pose a risk to individuals working in confined or depressed environments such as trenches, where inhaling significant amounts of SF6 might result in respiratory difficulties.
Q: What is the purity test of SF6 gas?
A: The process of testing the purity of SF6 gas involves quantifying its concentration in a sample, which is usually expressed as a percentage of SF6 by volume. Advanced gas analysis instruments are now capable of not only determining purity but also assessing factors such as humidity and dew/frost points. The measurement of SF6 purity often relies on methods based on conductivity or the velocity of sound through the gas.
Q: What are the by products of SF6 decomposition?
A: Decomposition of SF6 results in the formation of gases like SF4, SiF4, SO2F2, SO2, and HF, which can cause severe irritation to the respiratory system and mucous membranes, as documented in the Hazardous Substances Databank.
Q: What is a gas recovery unit?
A: A gas recovery unit is an apparatus designed to reclaim and recycle vented gases, such as those from flaring processes, and reintegrate them into the production stream as an energy source. This technology minimizes flaring and cuts down on atmospheric emissions, offering cost savings over time.
Q: How to check SF6 gas quality?
A: To assess the quality of SF6 gas, use a specialized analyzer to test for purity levels and the presence of typical impurities such as moisture and byproducts of decomposition. Ensure accurate results by adhering to the equipment manufacturer’s guidelines for sampling and analysis procedures.
Q: What is the leakage rate of SF6?
A: The acceptable leakage rate for SF6 is typically maintained at 0.5% or less per year. Advanced detection systems, like the 3731 model, can monitor large switchgear rooms with high sensitivity, detecting leaks as low as 6 ppb of SF6 in the air, and ensuring compliance with industry standards.