SF6 Density Relay Calibration Device and Its Calibration Method

Abstract

The present invention discloses an SF6 density relay calibration device and its calibration method. By combining manual and automatic pressurization and pressure relief, it realizes automatic debugging and calibration during the production process of SF6 density relays, saving time and effort, and improving the accuracy and convenience of SF6 density relay calibration. The SF6 density relay calibration device includes a box body. An operation panel is arranged on the front end face of the box body. A touch display screen is installed on the operation panel. A pressurization button, a pressure relief button, a rotary encoder switch, a contact status indicator light, and a power switch are respectively arranged on the right side of the touch display screen. A circuit board, a pressure sensor, a proportional valve, a switching power supply, and a temperature transmitter are installed inside the box body. A power socket, a signal aviation plug, a temperature aviation plug, a gas source inlet quick plug, a test port quick plug, and an exhaust port quick plug are arranged on the rear end face of the box body.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument calibration, and particularly to an SF6 density relay calibration device and a calibration method thereof. Background Art

[0002] An SF6 density relay is an important device for monitoring the gas pressure of SF6 circuit breakers in a power system. By monitoring the gas density in the gas chamber in real time, the normal operation and safety of the device can be ensured.

[0003] Currently, during the production of SF6 density relays, the meter adjustment work usually needs to be carried out in a constant temperature room with a temperature controlled at 20 degrees Celsius to ensure the accuracy of the relay. Then, a calibrated standard pressure gauge is prepared to provide accurate pressure readings. This standard pressure gauge is the benchmark for calibrating the accuracy of the SF6 density relay. Then, a gas cylinder filled with nitrogen is used and connected to the standard pressure gauge. The standard pressure gauge is connected to the SF6 density relay to be debugged to ensure that the gas can flow from the gas cylinder through the standard pressure gauge and then into the density relay. The gas cylinder is opened to allow nitrogen to flow into the system. The meter adjustment master will observe the readings of the standard pressure gauge as a reference. Through mechanical debugging, the contacts and related mechanical components inside the SF6 density relay are adjusted. These adjustments include adjusting the spring tension, contact gap, etc. The goal is to make the contacts of the SF6 density relay correctly close or open at different pressure points to reflect the actual gas pressure. At each preset pressure point, the meter adjustment master will compare the readings of the standard pressure gauge with the contact actions of the SF6 density relay. If the contact actions do not match the readings of the standard pressure gauge, fine-tuning will be carried out until the contacts act at the correct pressure. This may require repeated adjustments and verifications to ensure the accuracy of the relay within the entire pressure range. After completing the debugging of all pressure points, the meter adjustment master will record the debugging results and conduct tests to ensure that the relay can maintain accuracy under various working conditions.

[0004] The existing nitrogen gas cylinders used in the production process are equipped with mechanical valves. The disadvantage of directly adjusting the pressure using the mechanical valve on the gas cylinder is that it is difficult to control the intake pressure, which reduces the accuracy of meter adjustment. It requires the meter adjustment master to repeatedly operate for calibration, and manual testing is also required after debugging, which is time-consuming and laborious. Summary of the Invention

[0005] The present invention aims at the technical defects of the existing technology and provides an SF6 density relay calibration device and a calibration method thereof. Through the combination of manual and automatic pressure application and pressure release, automatic debugging and calibration during the production process of SF6 density relays are realized, which saves time and effort and improves the accuracy and convenience of the calibration of SF6 density relays.

[0006] The present invention provides the following technical solution: an SF6 density relay calibration device, including a box body, an operation panel is arranged on the front end face of the box body, a touch display screen is installed on the operation panel, a pressurization button, a pressure relief button, a rotary encoder switch, a contact status indicator light and a power switch are respectively arranged on the right side of the touch display screen, a circuit board, a pressure sensor, a proportional valve, a switching power supply and a temperature transmitter are installed inside the box body, and a power socket, a signal aviation plug, a temperature aviation plug, a gas source inlet quick plug, a test port quick plug and an exhaust port quick plug are arranged on the rear end face of the box body;

[0007] The power socket is connected to the power switch, the power switch is connected to the switching power supply, and the switching power supply is connected to the circuit board for power supply; the pressurization button, the pressure relief button, the rotary encoder switch and the proportional valve are respectively electrically connected to the circuit board;

[0008] The pressure sensor includes a first pressure sensor and a second pressure sensor, the proportional valve includes an air inlet, a first air outlet and a second air outlet, the gas source inlet quick plug is respectively connected to the first pressure sensor and the air inlet of the proportional valve through an air inlet pipe, the first air outlet is respectively connected to the second pressure sensor and the test port quick plug through an air outlet pipe, and the second air outlet is connected to the exhaust port quick plug through an air outlet pipe.

[0009] Preferably, the rotary encoder switch is an optoelectronic rotary encoder switch, which is used to greatly adjust the pressure of the test port. By screwing, a voltage regulation signal is input to the circuit board, and the circuit board sends out a voltage regulation control signal to the proportional valve. After the proportional valve adjusts the intake pressure, the pressure is output to the test port quick plug through the first air outlet.

[0010] Preferably, the pressurization button and the pressure relief button are fine-tuning buttons, which are used to finely adjust the pressure of the test port. By pressing the fine-tuning button, a voltage regulation signal is input to the circuit board, and the circuit board sends out a voltage regulation control signal to the proportional valve. After the proportional valve adjusts the intake pressure, the pressure is output to the test port quick plug through the first air outlet.

[0011] Preferably, a 485 aviation plug is also arranged on the rear end face of the box body. The 485 aviation plug is a 4-core aviation plug. Among them, 2 wires are led out from the circuit board and connected to the 485 aviation plug for power supply. Another 2 wires are led out from the circuit board and connected to an RS232 to RS485 communication module. The other end of the RS232 to RS485 communication module is connected to the 485 aviation plug to realize 485 communication.

[0012] Preferably, the temperature aviation plug is connected to the input end of the temperature transmitter, and the output end of the temperature transmitter is connected to the circuit board.

[0013] Preferably, a bracket is provided at the bottom of the box body. The bracket includes a bracket body and a connecting end. One end of the connecting end is fixed to both sides of the box body, and the other end is provided with a plum blossom groove. A plum blossom protrusion matching the plum blossom groove is provided on the bracket body; a return spring is arranged between the plum blossom groove and the plum blossom protrusion. When the bracket body is pulled, the plum blossom protrusion is disengaged from the plum blossom groove, and the angle of the bracket is adjusted to the required position; after releasing the hand, the return spring makes the plum blossom protrusion automatically snap into the plum blossom groove to fix the angle of the bracket.

[0014] Preferably, a mounting plate is provided at the bottom of the box body. The circuit board, pressure sensor, proportional valve, switching power supply, and temperature transmitter are all fixed on the mounting plate. Among them, the pressure sensor is provided with a pressure sensor bracket for fixing the first pressure sensor and the second pressure sensor. The pressure sensor bracket is integrally formed and is respectively provided with spaces for accommodating the first pressure sensor and the second pressure sensor. The bottom of the pressure sensor bracket is fixed on the mounting plate.

[0015] The calibration method of the SF6 density relay calibration device is as follows:

[0016] (1) Preparation before calibration; the quick connector at the gas source inlet is connected to the gas source, the temperature probe is connected to the temperature aviation plug, the signal aviation plug is connected to the SF6 density relay contact, the quick connector at the test port is connected to the SF6 density relay to be tested, the quick connector at the exhaust port is connected to the exhaust pipe, and the power supply socket is powered on.

[0017] (2) Debugging; turn on the machine and enter the menu interface. Click "Manual Pressure Regulation" to enter the manual pressure regulation interface. Select the pressure type of the SF6 density relay to be tested. The interface displays the pressure of contact 1, the pressure of contact 2, the pressure of contact 3, control parameters, P pressure, P 20 pressure. Manual pressure regulation is performed by rotating the encoder switch, the pressurizing button, and the pressure relief button. The operator performs mechanical debugging on the SF6 density relay to be tested through P 20 pressure, so that at different pressure points of the SF6 density relay, its contacts can be correctly closed or opened to reflect the actual gas pressure. After debugging, the gas source is exhausted, and click "Return" to return to the menu interface.

[0018] (3) Automatic test: For the ordinary SF6 density relay, click to enter the automatic test interface, select the pressure type of the SF6 density relay to be measured. The interface displays the selection of contact 1, contact 2, contact 3, maximum pressure, and inflation speed. After setting, press the confirmation key to start the automatic test. After the test is completed, it displays the upper cut-off value of contact 1, the upper cut-off value of contact 2, the upper cut-off value of contact 3, the lower cut-off value of contact 1, the lower cut-off value of contact 2, and the lower cut-off value of contact 3. Judge whether the readings and actions are accurate according to the test results. Press the return key to exit the automatic test interface and return to the menu interface; For the remote transmission SF6 density relay, click to enter the remote transmission test, select the pressure type of the SF6 density relay to be measured. After the test is completed, it displays press, temp, the current P of the remote transmission meter 20 , the current address, the new address, atmospheric pressure, P 20 , P. Judge whether the readings and actions are accurate according to the test results. Press the return key to exit the automatic test interface and return to the menu interface.

[0019] Preferably, when the SF6 density relay to be measured is a remote transmission SF6 density relay, the step further includes connecting a 485 aviation plug to the communication interface of the remote transmission SF6 density relay.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the above technical solution, the SF6 density relay calibration device includes a box body. An operation panel is provided on the front end face of the box body, and a touch display screen is installed on the operation panel. A pressurization button, a pressure relief button, a rotary encoder switch, a contact status indicator light, and a power switch are respectively arranged on the right side of the touch display screen. A circuit board, a pressure sensor, a proportional valve, a switching power supply, and a temperature transmitter are installed inside the box body. A power socket, a signal aviation plug, a temperature aviation plug, a gas source inlet quick plug, a test port quick plug, and an exhaust port quick plug are provided on the rear end face of the box body; The power socket is connected to the power switch, the power switch is connected to the switching power supply, and the switching power supply is connected to the circuit board for power supply; The pressurization button, the pressure relief button, the rotary encoder switch, and the proportional valve are respectively electrically connected to the circuit board; The pressure sensor includes a first pressure sensor and a second pressure sensor. The proportional valve includes an air inlet, a first air outlet, and a second air outlet. The gas source inlet quick plug is respectively connected to the first pressure sensor and the air inlet of the proportional valve through an air inlet pipe. The first air outlet is respectively connected to the second pressure sensor and the test port quick plug through an air outlet pipe. The second air outlet is connected to the exhaust port quick plug through an air outlet pipe;

[0022] The present invention discloses an SF6 density relay calibration device. This device is designed in a box structure. By combining manual and automatic pressure application and pressure release, it realizes automatic debugging and calibration during the production process of the SF6 density relay. Its structure is compact, enabling the calibration of the SF6 density relay anytime and anywhere, saving time and effort and improving operation convenience. The device includes a box body. An operation panel is provided on the front end face of the box body. A touch display screen is arranged on the operation panel for operators to perform test operations. A pressure application button and a pressure release button are provided for fine-tuning the pressure at the test port. A rotary encoder switch is used for large-scale adjustment of the pressure at the test port. A contact status indicator lamp indicates the status of the contact. A power switch controls the on / off of the power supply of the entire device. A power socket accesses a switching power supply to input AC220V, and the switching power supply outputs DC power supply to the circuit board. The control signal sent by the circuit board reaches the proportional valve. The proportional valve is set to have one inlet and two outlets. The pressure entering from the inlet is adjusted by the proportional valve and output to the outlet. The first outlet is quickly connected to the second pressure sensor and the test port through an outlet pipe, outputting the adjusted pressure to the test port. The pressure sensor tests the pressure at the outlet. The second outlet is quickly connected to the exhaust port through an outlet pipe for pressure release. It can realize manual and automatic pressure application and pressure release, and can obtain the pressure when the contact jumps during the pressure application and release process. It has the characteristics of a fast pressure application and release process and high pressure measurement accuracy, improving the accuracy and convenience of SF6 density relay calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structure schematic diagram of a specific embodiment of the present invention;

[0024] Figure 2 is Figure 1 the rear view of the shown specific embodiment;

[0025] Figure 3 is a schematic diagram of the internal structure of the box body;

[0026] Figure 4 is a three-dimensional structure schematic diagram of the pressure sensor bracket;

[0027] Figure 5 is a three-dimensional structure schematic diagram of the operation panel;

[0028] Figure 6 is a schematic diagram of the operation interface;

[0029] Figure 7 is a schematic diagram of the manual test interface;

[0030] Figure 8 is a schematic diagram of the automatic test interface Figure 1 ;

[0031] Figure 9 is a schematic diagram of the automatic test interface Figure 2 ;

[0032] Figure 10 It is a schematic diagram of the remote transmission test interface.

[0033] Description of the reference numerals in the drawings:

[0034] 1. Touch display screen; 2. Pressurization button; 3. Pressure relief button; 4. Rotary encoder switch; 5. Contact status indicator light; 6. Power switch; 7. Box body; 8. Bracket; 9. Power socket; 10. Signal aviation plug; 11. Temperature aviation plug; 12. 485 aviation plug; 13. Quick plug for gas source inlet; 14. Quick plug for test port; 15. Quick plug for exhaust port

[0035] 101. Pressure sensor; 102. Proportional valve; 103. Circuit board; 104. Switching power supply; 105. Temperature transmitter; 106. Pressure sensor bracket. Specific implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] As Figures 1 to 10 shown, it shows the specific implementation manners of the present invention: As Figures 1 to 3 shown, the SF6 density relay calibration device disclosed by the present invention includes a box body 7. An operation panel is arranged on the front end face of the box body 7. A touch display screen 1 is installed on the operation panel. A pressurization button 2, a pressure relief button 3, a rotary encoder switch 4, a contact status indicator light 5 and a power switch 6 are respectively arranged on the right side of the touch display screen 1. A circuit board 103, a pressure sensor 101, a proportional valve 102, a switching power supply 104 and a temperature transmitter 105 are installed inside the box body 7. A power socket 9, a signal aviation plug 10, a temperature aviation plug 11, a quick plug for gas source inlet 13, a quick plug for test port 14 and a quick plug for exhaust port 15 are arranged on the rear end face of the box body 7;

[0038] The power socket 9 is connected to the power switch 6, the power switch 6 is connected to the switching power supply 104, and the switching power supply 104 is connected to the circuit board 103 for power supply; the pressurization button 2, the pressure relief button 3, the rotary encoder switch 4 and the proportional valve 102 are respectively electrically connected to the circuit board 103;

[0039] The pressure sensor 101 includes a first pressure sensor and a second pressure sensor. The proportional valve 102 includes an air inlet, a first air outlet, and a second air outlet. The quick connector 13 of the air source inlet is connected to the first pressure sensor and the air inlet of the proportional valve 102 respectively through an air inlet pipe. The first air outlet is connected to the second pressure sensor and the quick connector 14 of the test port respectively through an air outlet pipe. The second air outlet is connected to the quick connector 15 of the exhaust port through an air outlet pipe.

[0040] Preferably, as Figures 1 to 3 shown, the rotary encoder switch 4 is an optoelectronic rotary encoder switch, which is used to greatly adjust the pressure of the test port. By screwing, a pressure regulation signal is input to the circuit board 103. The circuit board 103 sends out a pressure regulation control signal to the proportional valve 102. After the proportional valve 102 adjusts the intake pressure, the pressure is output to the quick connector 14 of the test port through the first air outlet. The optoelectronic rotary encoder switch is a high-precision and high-resolution detection device, which can be used to greatly adjust the rotation position and direction. Selecting the optoelectronic rotary encoder switch can achieve a large range of pressure adjustment, saving time and effort and being convenient to operate.

[0041] Preferably, as Figures 1 to 3 shown, the pressurizing button 2 and the pressure relief button 3 are fine-tuning buttons, which are used to finely adjust the pressure of the test port. By pressing the fine-tuning button, a pressure regulation signal is input to the circuit board 103. The circuit board 103 sends out a pressure regulation control signal to the proportional valve 102. After the proportional valve 102 adjusts the intake pressure, the pressure is output to the quick connector 14 of the test port through the first air outlet. The pressurizing button 2 and the pressure relief button 3 are usually used to finely adjust the air pressure. After the air pressure is greatly adjusted, the pressure is finely adjusted to achieve precise air pressure control, which helps to ensure the accuracy of calibrating the SF6 density relay.

[0042] Preferably, as Figures 2 to 3As shown, a 485 connector 12 is also provided on the rear end face of the box body 7. The 485 connector 12 is a 4-core connector. Among them, 2 wires are led out from the circuit board 103 and connected to the 485 connector 12 for power supply. Another 2 wires are led out from the circuit board 103 and connected to the RS232 to RS485 communication module. The other end of the RS232 to RS485 communication module is connected to the 485 connector 12 to achieve 485 communication. A 485 connector 12 interface is provided on the rear end face of the box body 7 for data communication and power transmission of the remote SF6 density relay, providing a stable and reliable connection method for the device; 2 wires led out from the circuit board 103 are connected to the 485 connector 12 to supply power to the 485 connector 12. Another 2 wires led out from the circuit board 103 are connected to the RS232 to RS485 communication module. This module is responsible for converting the data in RS232 format into RS485 format. Through this conversion, the device can achieve compatibility between different communication protocols, so as to better transmit data; This design is to meet the calibration requirements of the remote SF6 density relay. The remote SF6 density relay usually needs to be connected to a 485 communication interface for debugging. Through the 485 communication interface, a connection can be established with the density relay. After the connection is established, relevant instructions can be sent to obtain the status of the density relay, set parameters, or perform calibration and other operations. The function of being able to debug and set the density meter with wired remote transmission is a good helper for the production of SF6 density relays and remote density relays.

[0043] Preferably, as Figure 3 shown, the temperature connector 11 is connected to the input end of the temperature transmitter 105, and the output end of the temperature transmitter 105 is connected to the circuit board 103. A temperature probe is installed on the temperature connector 11. The resistance value measured by the temperature probe is transmitted to the pressure transmitter, and the pressure transmitter converts the resistance value into an electric current signal and outputs it to the circuit board 103. After receiving the electric current signal, the circuit board 103 converts it into the corresponding ambient temperature value according to the preset conversion formula, and automatically converts it into the pressure value at 20°C according to the pressure-temperature characteristic relationship of the SF6 gas, that is, it can perform automatic dynamic temperature compensation and calculate P 20 .

[0044] Preferably, as Figure 1As shown, a bracket 8 is provided at the bottom of the box body 7. The bracket 8 includes a bracket body and a connection end. One end of the connection end is fixed on both sides of the box body 7, and the other end is provided with a plum blossom groove. A plum blossom protrusion matching the plum blossom groove is provided on the bracket body; a return spring is arranged between the plum blossom groove and the plum blossom protrusion. When the bracket body is pulled, the plum blossom protrusion is disengaged from the plum blossom groove, and the angle of the bracket 8 is adjusted to the required position; after releasing the hand, the return spring makes the plum blossom protrusion automatically snap into the plum blossom groove to fix the angle of the bracket 8. This structural design combines the self-locking and angle adjustment functions. Through the action of the return spring, the bracket 8 can be automatically fixed after the angle is adjusted without manual snapping again. This greatly simplifies the operation process and improves the convenience and stability of use.

[0045] Preferably, as Figures 3 to 4 shown, an installation plate is provided at the bottom of the box body 7. The circuit board 103, the pressure sensor 101, the proportional valve 102, the switching power supply 104, and the temperature transmitter 105 are all fixed on the installation plate. Among them, the pressure sensor 101 is provided with a pressure sensor bracket 106 for fixing the first pressure sensor and the second pressure sensor. The pressure sensor bracket 106 is integrally formed and is respectively provided with spaces for accommodating the first pressure sensor and the second pressure sensor. The bottom of the pressure sensor bracket 106 is fixed on the installation plate. The installation plate is provided for fixing various components in the box body 7, and two pressure sensors 101 are provided to respectively test the inlet pressure and the outlet pressure. The pressure sensor bracket 106 firmly fixes the pressure sensor 101 at the position where measurement is required, preventing the pressure sensor 101 from vibrating violently or shifting, which helps to ensure the accuracy of the measurement data of the sensor and guarantees the stability and accuracy during the calibration process. The integrated design, the targeted design, the figure-eight shape effectively fixes the two pressure sensors 101, and a fastening bolt is provided between the two sensors to avoid loosening.

[0046] Preferably, as Figures 5 to 10 shown, it is the specific operation interface of the present invention, in which the functions corresponding to each button marked in the figure in each operation interface are Figure 6 A1 - Manual pressure regulation; A2 - Automatic test; A3 - Remote transmission test;

[0047] Figure 7 A101 - Current temperature display bar; A102 - Gas source pressure display bar; A103 - Prompt message bar; A104 - Relative pressure key; A105 - Gas source exhaust key; A106 - Drain key; A107 - Return key; A108 - Contact 1 pressure; A109 - Contact 2 pressure; A110 - Contact 3 pressure; A111 - Control parameter; A112 - Current control P pressure value display bar; A113 - Current control P 20 pressure value display bar;

[0048] Figures 8 to 9 Among them, A201 - Current Temperature Display Bar; A202 - Gas Source Pressure Display Bar; A203 - Prompt Message Bar; A204 - Relative Pressure Key; A205 - Inflation Speed Adjustment Key; A206 - Confirmation Key; A207 - Return Key; A208 - Contact 1 Selection; A209 - Contact 2 Selection; A210 - Contact 3 Selection; A211 - Maximum Pressure; A212 - Minimum Pressure; A213 - Inflation Speed Display Bar; A214 - Upper Cut-off Value Display Bar for Contact 1; A215 - Upper Cut-off Value Display Bar for Contact 2; A216 - Upper Cut-off Value Display Bar for Contact 3; A217 - Lower Cut-off Value Display Bar for Contact 1; A218 - Lower Cut-off Value Display Bar for Contact 2; A219 - Lower Cut-off Value Display Bar for Contact 3; A220 - Current P Pressure Value Display Bar; A221 - Current P 20 Pressure Value Display Bar;

[0049] Figure 10 Among them, A301 - Current Temperature Display Bar; A302 - Gas Source Pressure Display Bar; A303 - Prompt Message Bar; A304 - Current Pressure of Remote Transmitter; A305 - Current Temperature of Remote Transmitter; A306 - Current P of Remote Transmitter 20 ; A307 - Current Software Version of Remote Transmitter; A308 - Atmospheric Pressure Currently Used by Remote Transmitter; A309 - New Address to be Set for Remote Transmitter; A310 - Current Address of Remote Transmitter; A311 - Current P Pressure Value Display Bar; A312 - Current P 20 Pressure Value Display Bar; A313 - Set Address Key; A314 - Get Address Key; A315 - Read Atmospheric Pressure Value Key Used by Remote Transmitter; A316 - Set Atmospheric Pressure Value Key Used by Remote Transmitter; A317 - Read Remote Transmitter Value Key; A318 - Auto Read Sensor On / Off Key; A319 - Relative Pressure Key; A320 - Return Key.

[0050] The specific calibration method is as follows:

[0051] The calibration method of the SF6 density relay calibration device performs the following steps:

[0052] (1) Preparation before calibration; The quick plug 13 at the gas source inlet is connected to the gas source, the temperature probe is connected to the temperature aviation plug 11, the signal aviation plug 10 is connected to the contacts of the SF6 density relay, the quick plug 14 at the test port is connected to the SF6 density relay to be measured, the quick plug 15 at the exhaust port is connected to the exhaust pipe, and the power socket 9 is powered on;

[0053] (2) Debugging; After powering on, enter the menu interface, click on manual pressure regulation to enter the manual pressure regulation interface, select the pressure type of the SF6 density relay to be measured, and the interface displays the pressure of contact 1, the pressure of contact 2, the pressure of contact 3, control parameters, P pressure, P 20Pressure is manually adjusted by rotating the coding switch 4, the pressurizing button 2, and the pressure relief button 3. The operator uses P 20 to perform mechanical debugging on the measured SF6 density relay. At different pressure points, the contacts of the SF6 density relay can correctly close or open to reflect the actual gas pressure. After the debugging is completed, exhaust the gas source, click "Return" to return to the menu interface;

[0054] (3) Automatic testing; for a general type SF6 density relay, click to enter the automatic testing interface, select the pressure type of the measured SF6 density relay. The interface displays Contact 1 Selection, Contact 2 Selection, Contact 3 Selection, Maximum Pressure, Inflation Speed. After setting, press the confirmation key to start automatic testing. After the testing is completed, it displays the upper cut-off value of Contact 1, the upper cut-off value of Contact 2, the upper cut-off value of Contact 3, the lower cut-off value of Contact 1, the lower cut-off value of Contact 2, and the lower cut-off value of Contact 3. Judge whether the readings and actions are accurate according to the test results. Press the return key to exit the automatic testing interface and return to the menu interface; for a remote transmission type SF6 density relay, click to enter the remote transmission test, select the pressure type of the measured SF6 density relay. After the testing is completed, it displays press, temp, the current P of the remote transmission meter 20 、the current address, the new address, atmospheric pressure, P 20 、P. Judge whether the readings and actions are accurate according to the test results. Press the return key to exit the automatic testing interface and return to the menu interface.

[0055] Preferably, as Figures 5 to 10 shown, if the measured SF6 density relay is a remote transmission type SF6 density relay, step 1 further includes connecting the 485 aviation plug 12 to the communication interface of the remote transmission type SF6 density relay. Connecting the 485 aviation plug 12 to the communication interface of the remote transmission type SF6 density relay realizes data communication and power supply, thereby realizing the manual and automatic calibration of the remote transmission type SF6 density relay, adapting to the calibration of multiple types of relays in production, with a wide application range and convenient operation.

[0056] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. These changes involve related technologies well-known to those skilled in the art, and all fall within the protection scope of this invention patent.

[0057] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. SF6 density relay calibration device, characterized in that: The invention comprises a box (7), wherein an operation panel is arranged on the front face of the box (7), a touch screen (1) is installed on the operation panel, a pressurizing button (2), a pressure releasing button (3), a rotary coding switch (4), a contact state indicator light (5) and a power switch (6) are arranged on the right side of the touch screen (1), a circuit board (103), a pressure sensor (101), a proportional valve (102), a switching power supply (104) and a temperature transmitter (105) are installed inside the box (7), and a power socket (9), a signal air plug (10), a temperature air plug (11), an air source inlet quick plug (13), a test port quick plug (14) and an exhaust port quick plug (15) are arranged on the rear face of the box (7); The power socket (9) is connected to the power switch (6), the power switch (6) is connected to the switch power supply (104), and the switch power supply (104) is connected to the circuit board (103) for power supply; the pressurizing button (2), the pressure releasing button (3), the rotary coding switch (4), and the proportional valve (102) are respectively electrically connected to the circuit board (103); The pressure sensor (101) comprises a first pressure sensor and a second pressure sensor, the proportional valve (102) comprises an air inlet, a first air outlet and a second air outlet, the air source inlet quick connector (13) is respectively connected to the first pressure sensor and the air inlet of the proportional valve (102) via an air inlet pipe, the first air outlet is respectively connected to the second pressure sensor and the test port quick connector (14) via an air outlet pipe, and the second air outlet is connected to the exhaust port quick connector (15) via an air outlet pipe; The rotary encoding switch (4) is a photoelectric rotary encoding switch, which is used to adjust the pressure of the test port in a large range. By rotating, a pressure adjustment signal is input to the circuit board (103), and the circuit board (103) sends a pressure adjustment control signal to the proportional valve (102). The proportional valve (102) adjusts the intake pressure and then outputs the pressure to the test port quick plug (14) through the first outlet. The pressurizing button (2) and the pressure releasing button (3) are fine adjustment buttons, which make fine adjustments to the pressure of the test port. By pressing the fine adjustment button, a pressure adjustment signal is input to the circuit board (103), and the circuit board (103) sends a pressure adjustment control signal to the proportional valve (102). The proportional valve (102) adjusts the intake pressure and then outputs the pressure to the test port quick plug (14) through the first outlet. The pressure is output through the first air outlet to the test port quick plug (14); a 485 aviation plug (12) is also provided on the rear end surface of the box body (7), and the 485 aviation plug (12) is a 4-core aviation plug, wherein the circuit board (103) leads out two wires to be connected to the 485 aviation plug (12) for power supply, and the circuit board (103) leads out another two wires to be connected to the RS232 to RS485 communication module, and the other end of the RS232 to RS485 communication module is connected to the 485 aviation plug (12) to realize 485 communication; the temperature aviation plug (11) is connected to the input end of the temperature transmitter (105), and the output end of the temperature transmitter (105) is connected to the circuit board (103); A bracket (8) is provided at the bottom of the box body (7), and the bracket (8) comprises a bracket body and a connecting end, one end of the connecting end is fixed to two sides of the box body (7), and the other end is provided with a plum blossom groove, and a plum blossom protrusion matching the plum blossom groove is provided on the bracket body; a return spring is provided between the plum blossom groove and the plum blossom protrusion, and when the bracket body is pulled, the plum blossom protrusion is disengaged from the plum blossom groove, and the angle of the bracket (8) is adjusted to a desired position; after releasing the hand, the return spring causes the plum blossom protrusion to automatically engage with the plum blossom groove, thereby achieving the fixing of the angle of the bracket (8).

2. The SF6 density relay calibration device according to claim 1, characterized in that: A mounting plate is provided at the bottom of the box body (7), and the circuit board (103), the pressure sensor (101), the proportional valve (102), the switch power supply (104) and the temperature transmitter (105) are all fixed on the mounting plate, wherein the pressure sensor (101) is provided with a pressure sensor bracket (106) for fixing the first pressure sensor and the second pressure sensor, and the pressure sensor bracket (106) is integrally formed and is provided with spaces for accommodating the first pressure sensor and the second pressure sensor respectively, and the bottom of the pressure sensor bracket (106) is fixed on the mounting plate.

3. A calibration method for a SF6 density relay calibration device, characterized in that: Using the SF6 density relay calibration device as described in any one of claims 1-2, perform the following steps: (1) Preparation before calibration; connect the gas source inlet quick plug (13) to the gas source, connect the temperature probe to the temperature air plug (11), connect the signal air plug (10) to the SF6 density relay contact, connect the test port quick plug (14) to the SF6 density relay to be tested, connect the exhaust port quick plug (15) to the exhaust pipe, and power on the power socket (9); (2) Debugging: Turn on the machine and enter the menu interface. Click on manual voltage adjustment to enter the manual voltage adjustment interface. Select the pressure type of the SF6 density relay to be tested. The interface displays contact 1 pressure, contact 2 pressure, contact 3 pressure, control parameters, P pressure, P 20 The pressure is manually adjusted by rotating the coding switch (4), the pressure button (2) and the pressure release button (3). The operator can adjust the pressure manually by pressing the P 20 Pressure performs mechanical debugging on the SF6 density relay under test, so that the contacts of the SF6 density relay can be correctly closed or opened at different pressure points to reflect the actual gas pressure. After debugging, exhaust the gas source and click Return to return to the menu interface. (3) Automatic test; For ordinary SF6 density relay, click to enter the automatic test interface, select the pressure type of the SF6 density relay to be tested, and the interface displays contact 1 selection, contact 2 selection, contact 3 selection, maximum pressure, and inflation speed. After setting, press the confirmation key to start the automatic test. After the test is completed, the upper cut value of contact 1, the upper cut value of contact 2, the upper cut value of contact 3, the lower cut value of contact 1, the lower cut value of contact 2, and the lower cut value of contact 3 will be displayed. According to the test results, determine whether the readings and actions are accurate. Press the return key to exit the automatic test interface and return to the menu interface; for remote transmission SF6 density relay, click to enter the remote transmission test, select the pressure type of the SF6 density relay to be tested, and after the test is completed, press, temp, and the current P value of the remote transmission table will be displayed. 20 , Current address, New address, Atmospheric pressure, P 20 , P, judge whether the readings and actions are accurate based on the test results, press the return key to exit the automatic test interface and return to the menu interface.

4. The calibration method of the SF6 density relay calibration device according to claim 3, characterized in that: The SF6 density relay to be tested is a remote transmission type SF6 density relay, and step (1) further includes connecting the 485 aviation plug (12) to the communication interface of the remote transmission type SF6 density relay.

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