SF6 Density Relay Calibrator

HM3030 SF6 density relay calibrator

1.Necessity of SF6 density relay calibration

SF6 switch is a high-voltage electrical appliance widely used in power systems. The reliable operation of the SF6 switch has become one of the most concerned issues of the power supply department. The SF6 density relay is an important component used to monitor the change of the SF6 gas density inside the SF6 switch during operation, and its performance directly affects the operational safety of the SF6 switch. The SF6 gas density relays operating on-site do not operate frequently. After a period of time, they often experience inflexible actions and poor contact contact. Some of the density relays have poor temperature compensation performance. When the ambient temperature changes suddenly, it often leads to SF6. Density relay malfunctions.

2.Basic principle of SF6 density relay calibration

The gas pressure in a closed container changes with the temperature. In order to facilitate statistics and comparison, the relative pressure value of the SF6 gas under the standard condition of 20℃ is usually taken as the standard value. During the on-site inspection, the measured SF6 pressure value must be converted to its equivalent pressure value corresponding to the 20℃ standard condition, so as to judge the performance of the density relay.

3.The calibration process of SF6 density relay is as follows:

At ambient temperature, when the internal pressure of the SF6 density relay is zero pressure, the SF6 density relay is slowly inflated and boosted at a certain speed. When the blocking relay of the SF6 density relay is activated, the pressure value under the current ambient temperature is recorded and converted The equivalent pressure value at 20°C is the equivalent pressure value at 20°C, which is the latching recovery value of the SF6 density relay. Continue to inflate the SF6 density relay slowly at a certain speed and increase the pressure. When the alarm relay of the density relay is activated, record the pressure value at the current ambient temperature and convert it to the equivalent pressure value at 20°C. The equivalent pressure value is the alarm response value of the SF6 density relay.

At ambient temperature, when the pressure in the SF6 density relay is greater than the alarm response value, slowly vent and reduce the pressure at a certain speed. When the alarm relay of the SF6 density relay is activated, record the pressure value at the current ambient temperature and convert it to 20 The equivalent pressure value at ℃, the equivalent pressure value at 20℃ is the alarm value of the SF6 density relay. Continue to deflate the SF6 density relay slowly at a certain speed to lower the pressure. When the latching relay of the SF6 density relay operates, record the pressure value at the current ambient temperature and convert it to the equivalent pressure value at 20°C, which is 20°C The equivalent pressure value at the time is the blocking value of the SF6 density relay.

1. Working voltage: AC220V, 50Hz; instrument power: 55W

2. Instrument accuracy: 0.2 level

3. Detection object:

①SF6 density relay: single alarm, single lockout, single alarm and single lockout, single alarm and double lockout

②Normal temperature gas pressure gauge: 0～1MPa arbitrary pressure point calibration

②20 degree gas pressure gauge: 0～1MPa arbitrary pressure point calibration

4. Pressure detection range: 0～1MPa; pressure resolution: 0.001MPa

5. Temperature display range; -20℃~80℃; temperature resolution: 0.1C

6. Instrument working temperature: -10℃～60℃; humidity: 90%RH

7. Display mode: 320X240 graphic dot matrix monochrome LCD screen

8. Operation mode: One-key shuttle (rotating mouse)

9. Gas quick lock connector: all imported original components

10. Printer type: high-speed thermal printer

11. Storage capacity: 32 pages*3 total 96 pages of test results can be stored at the same time

12. SF6 gas density display mode: the pressure under the measured environment and the equivalent pressure at 20°C.

13. Dimensions: host: 440×350×250(mm); accessory box: 400×370×200(mm)

14. Instrument weight: host: 5Kg; accessory box: 8Kg

1. The density relay calibrator uses high-performance single-chip microcomputer for detection and control, with a high degree of integration. Mechatronics design, high precision, good repeatability and high reliability.

2. Equipped with a monochrome LCD screen and a rotary switch, the operation is simple, the interface is beautiful, and all parameters and status are clear at a glance.

3. Automatically complete pressure measurement and 20°C value conversion, thereby completing dynamic automatic compensation between pressure and temperature. It also displays the pressure at the measured ambient temperature, the pressure at 20°C, and the ambient temperature. Thoroughly solve the problem of difficult on-site calibration of SF6 gas density relay.

4. All testing processes are controlled by the single-chip microcomputer to complete automatically, without manual intervention.

5. The test results are printed in Chinese report form, and the average value of the test results is automatically calculated to generate a simple report.

6. It can store 32 pages*3 and 96 pages of test results at the same time, and has the function of saving power off data, and can query and print historical test results at any time.

7. There is no need for a constant temperature room during the calibration process, and the SF6 gas density relay and pressure gauge can be calibrated within any effective temperature range.

8. Equipped with various types of transition joints, the density relays of most types of switches can be verified on site without disassembly.

9. The SF6 gas can be replaced by other dry and non-corrosive gases during the detection process, which consumes less gas.

10. In addition to the density relay calibration function, this instrument also has 20 ℃ pressure gauge calibration and normal temperature pressure gauge calibration functions.

11. It has the function of online modification of the system clock.

12. It has the function of online modification of system pressure.

13. The core components are imported components with reliable performance and high precision.

14. At most, one set of alarm signals and two sets of blocking signals can be tested at the same time.

15. This product is a portable tool that is easy to use and reliable. It is a necessary equipment for on-site calibration of SF6 density relays and pressure gauges.

16. With data upload function, it is convenient to extract and print test records.