YHMD type fully automatic SF6 density relay calibratorIt is an intelligent SF6 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 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 print and store test data in real time for reference. At the same time, it can automatically identify faults during the testing process. This product is easy to carry, simple to operate, has high testing accuracy, strong stability, and good reliability, reflecting the characteristics of the instrument being "intelligent".
SF6 switches are widely used high-voltage electrical appliances in power systems, and the reliable operation of SF6 switches has become one of the most concerned issues for power supply and consumption departments. SF6 gas density relay is an important component used to monitor the changes in SF6 gas density in the SF6 switch body during operation, and its performance directly affects the safety of SF6 switch operation. The SF6 gas density relay operating 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 misoperation of SF6 density relays when the ambient temperature suddenly changes. Therefore, DL/T596-1996 "Preventive Testing Regulations for Power Equipment" stipulates that each SF6 switch user unit should regularly calibrate SF6 gas density relays. From the actual operating situation, it is also necessary to regularly calibrate SF6 density relays and pressure gauges during on-site operation.

1) The density relay calibrator adopts a 32-bit microprocessor and TI's high-speed signal processing chip for detection and control, with a high degree of integration. Mechatronics design, high precision, good repeatability, and high reliability.
2) Equipped with a large Chinese LCD screen and a rotating mouse (one click shuttle) human-machine interface, the operation is simple, the interface is beautiful, and all parameters and statuses are clear at a glance.
3) Automatically complete pressure measurement and 20 ℃ value conversion, thus achieving dynamic automatic compensation between pressure and temperature. And display the pressure at the tested ambient temperature, the pressure at the ambient temperature of 20 ℃, and the ambient temperature. Thoroughly solved the problem of difficult on-site calibration of SF6 gas density relays.
4) All testing processes are automatically completed by instruments without manual intervention, avoiding tedious manual air circuit adjustment operations.
5) Print test results in Chinese character report format and perform intelligent analysis on the test results.
6) It can store 50 sets of test results simultaneously and has power-off data protection function, which can query and print previous test results at any time.
7) During the verification process, there is no need for a constant temperature chamber, and SF6 gas density relays and pressure gauges can be calibrated within any effective temperature range.
8) Equipped with multiple types of transition joints, most density relays for switches can be verified on-site without disassembly.
9) The verification process consumes very little gas, does not waste SF6 gas, has low testing costs, and is environmentally friendly.
10) It has the function of online modification of system clock.
11) It has the function of online modification of system pressure and can be corrected on-site.
12) The core components are imported and have reliable performance.
13) Can simultaneously test one set of alarm signals and two sets of lockout signals.
14) This product is a portable tool that is easy to use and reliable, making it the best choice for SF6 density relay calibration.

1. LCD display instructions
This instrument adopts a 320 × 240 high-resolution gray backlit LCD display screen, which can display clearly even in strong sunlight. The parameter settings and test results are displayed on the LCD screen. Full Chinese character operation interface, clear and beautiful graphics, easy to operate.
2. Rotating Mouse Instructions
The function of rotating a mouse is similar to that of a computer mouse, and it has three operations: "left rotation", "right rotation", and "click to select". Through these three mouse operations, functions such as moving the cursor, data input, and selecting operations can be achieved.
Move cursor: Use left or right mouse to move the cursor to the desired option, then click the knob to select it.
Data input: When it is necessary to modify or input data, move the cursor to the option where the data needs to be modified, click the mouse, and enter the data modification operation (shrink the cursor to the modified position). Left or right rotation of the mouse will perform the addition or subtraction operation of that position, and click the mouse to confirm the modification of that position. Rotate the mouse to enter the next modification. After completing the modification bit by bit, the cursor increases to full cursor, which means the data modification operation is exited. At this time, the cursor can be moved away by rotating the mouse.
3. Instrument usage instructions
When verifying the SF6 density relay on site, please use the accessories configured by the instrument to connect the gas circuit and line according to Figure 1. Connect the inlet pipe to the measuring port of the instrument and the gas cylinder, connect the outlet pipe to the gas outlet, connect the measuring pipe to the measuring port of the instrument and the overcurrent joint of the SF6 density relay to be tested, and connect the six core test wire to the corresponding testing point on the instrument and the wiring cabinet.

According to the testing objectives, connect one end of the equipped six core test wire to the aviation plug signal port on the instrument panel, and connect the other end with a crocodile clip to the signal socket on the wiring cabinet of the density relay according to the testing signal. Unused crocodile clips should be left idle and not in contact with other crocodile clips. When testing a signal (one of single alarm, single lock 1, or single lock 2), only the corresponding test signal should be connected, and "single signal" should be selected on the operation interface, and the system will automatically recognize it.
If the pressure gauge calibration operation needs to be performed, the pressure gauge to be calibrated needs to be connected to the measuring port on the instrument panel; If the system pressure value correction operation needs to be performed, the high-precision pressure gauge calibrated by measurement needs to be connected to the measuring port on the instrument panel as shown in Figure 2.