SF₆  switch is a widely used high-voltage electrical appliance in the power system, and the reliable operation of SF switch has become one of the most concerned issues for the power supply and consumption departments. SF6  gas density relay is an important component used to monitor the changes in SF6  gas density in theSF₆   switch body during operation, and its performance directly affects the safety of SF₆   switch operation. The SF₆   gas density relay running on site often experiences inflexibility and poor contact of contacts after a period of time due to infrequent operation. Some density relays may also have poor temperature compensation performance, which can lead to false operation of the SF6  density relay when the ambient temperature suddenly changes. Therefore, DL/T596-2005 "Preventive Testing Regulations for Power Equipment" stipulates that each SF switch user unit should regularly verify the SF gas density relay. From the actual operating situation, it is also necessary to regularly calibrate the SF density relay and pressure gauge during on-site operation.

The product is an intelligent SF gas density relay calibration instrument. This calibrator uses high-precision pressure sensors and high-speed A/D converters, combined with a 32-bit high-performance microprocessor, to perform performance verification on various SF6 gas density relays. It can accurately measure the pressure value at the current temperature when the signal is activated, automatically convert the standard pressure at 20 ℃ to any ambient temperature, and has printing, storage, and USB conversion functions. At the same time, it can automatically identify faults during the testing process. The product is easy to carry, easy to operate, has high testing accuracy, strong stability, and good reliability, reflecting the "intelligent" characteristics of the instrument.

Technical features:

The main function of the instrument is to measure the alarm value, lockout value, alarm response value, and lockout response value of SF ₆ gas density relay. The measurement process can be single lockout measurement or double lockout measurement. At the same time, the instrument has the function of calibrating the normal temperature pressure gauge and the 20 degree pressure gauge.

1. Easy to operate: All testing processes are automatically completed by the instrument, without the need for manual intervention, avoiding tedious manual air circuit adjustment operations.

2. Convenient testing: This product is a portable instrument equipped with multiple types of transition joints. Most density relays for switches can be verified on-site without disassembly.

3. Highly intelligent: The calibration process does not require a constant temperature chamber, and the SF ₆ gas density relay and pressure gauge can be calibrated within any effective temperature range. By using pressure and temperature dynamic compensation algorithms, automatic pressure measurement and 20 ℃ value conversion are completed, while displaying the pressure at the measured ambient temperature, the pressure at the ambient temperature of 20 ℃, and the ambient temperature, completely solving the difficult problem of on-site calibration of SF ₆ gas density relays.

4. Powerful function: When calibrating the SF ₆ gas density relay, it can simultaneously test one set of alarm signals and two sets of lockout signals, and has the functions of calibrating the normal temperature pressure gauge and the 20 degree pressure gauge.

5. Safety and Environmental Protection: Nitrogen is used instead of SF during the verification process to ensure the safety of testing personnel, low testing costs, and no pollution to the environment.

6. Human computer interface friendly: The large screen 320 * 240 dot matrix Chinese character graphic interface has clear and beautiful graphics. It uses a high-performance rotating mouse for easy operation and comes with a high-speed micro thermal printer for instant printing of test data.

7. Data storage: The instrument can store up to 50 sets of test results and has a power-off data saving function, allowing for easy retrieval and printing of previous test results at any time

8. USB flash drive transfer: Supports USB flash drive transfer of test data, which can be read through a PC for easy and fast operation.

9. Powerful PC software: PC application software has powerful functions and simple operation, enabling data analysis, saving, printing, and generating complete test reports for centralized data management.

Technical parameters:

1. Environmental temperature: -20 ℃ to 70 ℃

2. Relative humidity: 90% RH

3. Working power supply: AC220V, 50Hz

4. Instrument power: 50W

5. Instrument accuracy: 0.2 level

6. Pressure display resolution: 0.001MPa

7. Pressure calibration range: 0-1MPa

8. Environmental temperature display resolution: 0.1C