CN109752649B - A density relay intelligent calibration monitoring device and gas supply calibration method thereof - Google Patents

Abstract

The present invention discloses an intelligent calibration and monitoring device for a density relay, comprising a mechanical module, a circuit module and a background module; the mechanical module is connected to the circuit module; the circuit module is connected to the background module via a network; after the mechanical module and the background module are connected via the circuit module, they can communicate normally; also disclosed are a method for calibrating a density relay and replenishing gas using the above device, as well as a method for calibrating the device; the intelligent calibration and monitoring device for a density relay and its gas replenishment calibration method of the present invention realize online monitoring, intelligent calibration, integrated gas replenishment functions, and intelligently judge the accuracy of a density relay, and are a necessary means for realizing a networked online intelligent calibration and monitoring system for the electric power industry.

Description

A density relay intelligent calibration monitoring device and gas supply calibration method thereof

Technical Field

The invention relates to a monitoring and checking device, in particular to an intelligent checking and monitoring device for a density relay and a gas supply checking method thereof, belonging to the technical field of electrical instrument monitoring.

Background technique

Switchgear is an electrical device that has been widely used in power systems, and its reliable operation has become one of the important guarantees for stable power supply in power systems. Density relays are an important means installed on switches to monitor changes in gas density and ensure the insulation performance of switches. If the gas density drops to the corresponding threshold, an alarm or lockout will be generated to prevent a vicious explosion during the switch operation. Therefore, the quality of the density relay is directly related to whether the switch can operate normally. Therefore, in the power industry, SF6 density relays should be calibrated regularly.

At present, there are two ways to calibrate the density relay: one is the disassembly calibration method: disassemble the density relay from the switch device, transport the density relay in batches to the test room, connect the density relay calibrator and the gas circuit joints of the gas supply port one by one, connect the electrical wiring of the density relay calibrator and the density relay contacts, and use the density relay calibrator to step up and down the voltage for calibration. After completion, disassemble the gas circuit joints and electrical wiring, and then transport it to the site for mechanical installation, open the gas circuit, make electrical connections, and install a rain cover when working outdoors. The second is the non-disassembly calibration method: there is no need to disassemble the density relay from the switch device, and the electrical connection wires of the density relay need to be removed one by one, the gas chamber valve on the switch device needs to be closed, and the gas circuit joints of the density relay calibrator and the gas supply port need to be connected one by one, and the electrical wiring of the density relay calibrator and the density relay contacts need to be connected, and the density relay calibrator needs to step up and down the voltage for calibration. After completion, disassemble the gas circuit joints and electrical wiring, open the gas circuit, make the original electrical connections, and install a rain cover when working outdoors.

Disadvantages of existing calibration methods: 1. The density relay needs to be disassembled, and the disassembly process is cumbersome and inefficient; 2. The original sealing performance is destroyed during the disassembly and installation process; 3. Bumps are inevitable during transportation, which may damage the instrument; 4. The density relay is easily installed in the wrong position during installation; 5. The density relay needs to be disassembled and installed in real time during the maintenance power outage. Time is tight, the task is heavy, and personnel are prone to fatigue and mistakes; 7. The density relay is installed in a high place and needs to be operated at high altitude. It is difficult to disassemble and install, and there is a personal danger; 8. The non-disassembly method requires the disassembly and installation of electrical lines. When working with power on, if there is an error in the steps, it will cause an erroneous alarm lockout signal to enter the relay protection, making the circuit breaker unable to operate normally, causing tension for the operating personnel, and in severe cases, it will lead to Causing serious accidents; 9. Non-disassembly method requires disassembly of rain cover and opening and closing of valves, which is a cumbersome process with low efficiency, and personnel are prone to fatigue and mistakes; 10. Non-disassembly method requires connecting the calibrator air pipe to the air supply interface, and the on-site operation space is limited; 11. Non-disassembly method requires gas cylinders for calibration, and more gas will be discharged during the calibration process, causing waste; 12. Non-disassembly method requires strong professional requirements for personnel, and requires a large number of personnel, resulting in manpower waste; 13. The entire calibration process requires a lot of manual participation, and only one meter can be calibrated at a time, which is inefficient. The disassembly calibration takes an average of 30 minutes for each meter, and the non-disassembly calibration of each density relay takes at least 10 minutes, and up to 1 hour; 14. Manual recording of calibration data is required, and the data is copied and entered into the computer to form a report file.

Summary of the invention

In view of the above-mentioned technical problems, the purpose of the present invention is to propose a density relay intelligent calibration monitoring device and its gas replenishment calibration method which realizes the integrated functions of online monitoring, intelligent calibration and gas replenishment, and can intelligently judge the accuracy of the density relay.

The technical solution of the present invention is implemented as follows: a density relay intelligent calibration and monitoring device includes a mechanical module, a circuit module and a background module; the mechanical module is connected to the circuit module; the circuit module is connected to the background module through a network; after the mechanical module and the background module are connected through the circuit module, they can communicate normally.

Preferably, the mechanical module includes a density relay interface, a density relay electrical interface, a detection air chamber, a working air chamber, a switch device docking joint and an air supply joint; the density relay interface and the density relay electrical interface are both connected to the density relay; the density relay interface is connected to the detection air chamber; the detection air chamber is connected to the working air chamber through an air pipeline; a third normally closed solenoid valve and a sensor are provided in the detection air chamber; a solenoid valve group is provided in the working air chamber; a switch device docking joint is connected to the working air chamber; an air supply joint is connected to the detection air chamber; the density relay electrical interface is connected to the circuit module; the third normally closed solenoid valve and the solenoid valve group are respectively connected to the circuit module; the third normally closed solenoid valve is connected to the seventh air pipeline; the seventh air pipeline is connected to the air supply joint.

Preferably, the solenoid valve group includes a first normally closed solenoid valve, a first normally open solenoid valve and a second normally closed solenoid valve; the detection air chamber is connected to the working air chamber through a first air pipeline, a third air pipeline and a fifth air pipeline; the first normally closed solenoid valve is connected to the first air pipeline and the second air pipeline respectively; the second air pipeline is connected to the outside world; the first normally open solenoid valve is connected to the third air pipeline and the fourth air pipeline respectively; the second normally closed solenoid valve is connected to the fifth air pipeline and the sixth air pipeline respectively; after the fourth air pipeline and the sixth air pipeline are connected, they are connected to the docking joint of the switch device.

Preferably, the circuit module includes an electronic circuit board, a shell, a relay protection interface and a background module communication network interface; the electronic circuit board is arranged in the shell; the shell is provided with a relay protection interface and a background module communication network interface; the background module communication network interface is connected to the background module; the density relay electrical interface, the first normally closed solenoid valve, the first normally open solenoid valve, the second normally closed solenoid valve and the third normally closed solenoid valve are all connected to the electronic circuit board.

Preferably, the background module is a software system.

Preferably, the normally closed solenoid valve includes a valve body, a valve core, an elastic component, an electromagnetic drive mechanism, a low-pressure side air inlet, a high-pressure side air inlet and a sealing ring; the valve core is arranged in the valve body; an elastic component is arranged between the valve core and the valve body; the electromagnetic drive mechanism is connected to the valve core; low-pressure side air inlet and high-pressure side air inlet are arranged on both sides of the valve body; a plurality of sealing rings are arranged on the valve core; at least one sealing ring is arranged between the low-pressure side air inlet and the high-pressure side air inlet, and the low-pressure side air inlet and the high-pressure side air inlet are not connected; when the electromagnetic drive mechanism is started, the elastic component is compressed, driving the valve core to move, and the low-pressure side air inlet and the high-pressure side air inlet are connected.

Preferably, the normally open solenoid valve includes a valve body, a valve core, an elastic component, an electromagnetic drive mechanism, a low-pressure side air inlet, a high-pressure side air inlet and a sealing ring; the valve core is arranged in the valve body; an elastic component is arranged between the valve core and the valve body; the electromagnetic drive mechanism is connected to the valve core; low-pressure side air inlet and high-pressure side air inlet are arranged on both sides of the valve body; a plurality of sealing rings are arranged on the valve core; the low-pressure side air inlet and the high-pressure side air inlet are connected; when the electromagnetic drive mechanism is started, the elastic component is compressed, driving the valve core to move, and the at least one sealing ring is located between the low-pressure side air inlet and the high-pressure side air inlet, and the low-pressure side air inlet and the high-pressure side air inlet are not connected.

The method for calibrating a density relay using an intelligent calibration monitoring device for a density relay comprises the following steps:

(1) The software system sends specific verification instructions to a product or a batch of products that need to be verified. After the CPU on the electronic circuit board receives the instructions, it starts to execute the commands according to the regulations;

(2) The circuit logic is controlled by the CPU on the electronic circuit board, which stores the current parameters of the sensor and switches to the density relay calibration state to prevent false alarms of relay protection;

(3) The CPU performs the following actions: close the first normally open solenoid valve, cut off the gas line, open the first normally closed solenoid valve, allow the gas in the detection chamber to be discharged slightly, and the pressure to decrease. At the same time, the CPU captures the contact change state of the density relay and records the parameter changes of the sensor in real time. The parameter value of the sensor is stored while the contact changes. This step continues until the pressure in the detection chamber drops below the rated contact action value of the density relay, and this step ends;

(4) The CPU performs the following actions: the first normally open solenoid valve opens the second normally closed solenoid valve to replenish gas to the detection chamber, and the pressure increases. At the same time, the CPU captures the contact change state of the density relay, records the parameter changes of the sensor in real time, and stores the parameter value of the sensor while the contact changes. This step continues until the pressure of the detection chamber rises to the stored parameter value of step (3), and this step ends;

(5) The CPU performs the following actions: closes the second normally closed solenoid valve, opens the first normally open solenoid valve, and restores the original state. The circuit logic switches to the online monitoring state through the CPU control circuit on the electronic circuit board, and sends a verification completion signal to the software system, and the entire verification state ends.

The method for replenishing gas using the density relay intelligent calibration monitoring device comprises the following steps:

(1) Connect the air supply device to the air supply interface, ensure that there is sufficient pressurized gas in the air supply device, and adjust the expected pressure;

(2) The software system sends specific instructions to the product that needs to be refilled;

(3) After receiving the instruction, the CPU on the electronic circuit board starts to execute the command according to the regulations;

(4) The circuit logic is controlled by the CPU on the electronic circuit board, which stores the current parameters of the sensor and switches to the gas replenishment state to prevent false alarms of relay protection;

(5) The CPU performs the following actions: the third normally closed solenoid valve is opened, the states of the other solenoid valves remain unchanged, and the gas begins to automatically flow through the third normally closed solenoid valve, enters the detection gas chamber, enters the switch device docking joint through the first normally open solenoid valve, and then directly enters the switch device;

(6) When the gas reaches equilibrium, the inflation is completed, and the software system sends a gas replenishment completion instruction. After receiving the instruction, the CPU on the electronic circuit board closes the third normally closed solenoid valve. The circuit logic is controlled by the CPU on the electronic circuit board, switches to the online monitoring state, and sends a inflation completion signal to the background software system;

(7) Close the air supply device and the entire inflation process is completed.

A method for calibrating a density relay intelligent calibration monitoring device comprises the following steps:

(1) The calibrated special high-precision instrument is connected to the gas supply joint through a quick connector, and the electrical connector of the high-precision instrument is connected to the electrical connector of the corresponding electronic circuit board part;

(2) The high-precision instrument sends specific calibration instructions to the product to be calibrated through the electrical connector. After receiving the instructions, the CPU on the electronic circuit board begins to execute the commands according to the regulations;

(3) The logic is controlled by the CPU on the electronic circuit board, stores the current parameters of the sensor, switches to a high-level verification state, eliminates false alarms of relay protection, and returns status information to the background software system;

(4) The CPU performs the following actions: opening the third normally closed solenoid valve, closing the first normally open solenoid valve, cutting off the gas path, opening the first normally open solenoid valve, and allowing a small amount of gas in the detection chamber to be discharged until the pressure drops to 0. The high-precision instrument automatically reads the gas density of the present invention through communication, and compares it point by point with the gas density measured by the dedicated high-precision instrument itself to form a curve that is stored inside the high-precision instrument for export;

(5) The CPU performs the following actions: close the first normally closed solenoid valve, open the second normally closed solenoid valve, replenish gas to the detection gas chamber, and increase the pressure to the pressure before the calibration start. The high-precision instrument automatically reads the gas density of the present invention through communication, and compares it point by point with the gas density measured by the dedicated high-precision instrument itself to form a curve stored in the high-precision instrument for export;

(6) The CPU performs the following actions: closes the third normally closed solenoid valve, the second normally closed solenoid valve, opens the first normally open solenoid valve, switches to the online monitoring state, and notifies the high-precision instrument that the operation is complete. At this time, the electrical connector of the high-precision instrument can be unplugged, and the quick connector can be unplugged, and the entire calibration process is completed.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

The intelligent calibration and monitoring device for density relays and the gas replenishment calibration method thereof of the present invention send corresponding density relay calibration, online monitoring, and switch equipment gas replenishment commands through a software system. The present invention executes the commands, controls the corresponding electrical circuits, controls each solenoid valve, and sensor, and returns the execution result to the software system. The present invention can calibrate density relays in large quantities in a short time under the condition of online power supply (high voltage does not require power outage) and without manual on-site operation, and automatically generates calibration reports, thereby improving the calibration work efficiency to the extreme, eliminating false alarms caused by manual operation, eliminating personal dangers, and greatly reducing waste; realizing rapid gas replenishment of each switch equipment; batch online monitoring, etc.; advanced calibration one by one to form a point-by-point comparison curve with perfect sealing; integrating multiple functions and combining multiple links.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

FIG1 is a schematic diagram of the structure of the intelligent calibration and monitoring device for density relays of the present invention;

Figure 2 is a partial enlarged view of Figure 1;

3 is a schematic diagram of the structure of the normally closed solenoid valve of the density relay intelligent calibration and monitoring device of the present invention;

FIG4 is a schematic diagram of the structure of a normally closed solenoid valve of the density relay intelligent calibration and monitoring device of the present invention;

FIG5 is a schematic diagram of the structure of the intelligent calibration and monitoring device for density relays of the present invention in use state;

Among them: 1. Density relay interface; 2. Density relay electrical interface; 3. Detection gas chamber; 4. Working gas chamber; 5. Switchgear docking joint; 6. Air supply joint; 7. Density relay; 8. Third normally closed solenoid valve; 9. Sensor; 10. First normally closed solenoid valve; 11. First normally open solenoid valve; 12. Second normally closed solenoid valve; 13. First gas pipeline; 14. Third gas pipeline; 15. Fifth gas pipeline; 16. Second gas pipeline; 17. Fourth gas pipeline; 18. Sixth gas pipeline; 19. Seventh gas pipeline; 20. Valve body; 21. Valve core; 22. Elastic component; 23. Electromagnetic drive mechanism; 24. Low-pressure side air inlet; 25. High-pressure side air inlet; 26. Sealing ring; 27. Electronic circuit board; 28. Shell; 29. Relay protection interface; 30. Background module communication network interface; 31. Background module.

Detailed ways

The present invention will be described below in conjunction with the accompanying drawings.

As shown in Figures 1-5, a density relay intelligent calibration and monitoring device described in the present invention includes a mechanical module, a circuit module and a background module 31; the mechanical module is connected to the circuit module; the circuit module is connected to the background module 31 through a network; after the mechanical module and the background module 31 are connected through the circuit module, they can communicate normally.

The above-mentioned density relay intelligent calibration and monitoring device, the mechanical module includes a density relay interface 1, a density relay electrical interface 2, a detection air chamber 3, a working air chamber 4, a switch device docking joint 5 and an air supply joint 6; the density relay interface 1 and the density relay electrical interface 2 are both connected to the density relay 7; the density relay interface 1 is connected to the detection air chamber 3; the detection air chamber 3 is connected to the working air chamber 4 through an air pipeline; a third normally closed solenoid valve 8 and a sensor 9 are provided in the detection air chamber 3; a solenoid valve group is provided in the working air chamber 4; a switch device docking joint 5 is connected to the working air chamber 4; an air supply joint 6 is connected to the detection air chamber 3; the density relay electrical interface 1 is connected to the circuit module; the third normally closed solenoid valve 8 and the solenoid valve group are respectively connected to the circuit module; the solenoid The valve group includes a first normally closed solenoid valve 10, a first normally open solenoid valve 11 and a second normally closed solenoid valve 12; the detection air chamber 3 is connected to the working air chamber 4 through a first air pipeline 13, a third air pipeline 14 and a fifth air pipeline 15; the first normally closed solenoid valve 10 is respectively connected to the first air pipeline 13 and the second air pipeline 16; the second air pipeline 16 is connected to the outside; the first normally open solenoid valve 11 is respectively connected to the third air pipeline 14 and the fourth air pipeline 17; the second normally closed solenoid valve 12 is respectively connected to the fifth air pipeline 15 and the sixth air pipeline 18; after the fourth air pipeline 17 and the sixth air pipeline 18 are connected, they are connected to the switch device docking joint 5; the third normally closed solenoid valve 8 is connected to the seventh air pipeline 19; the seventh air pipeline 19 is connected to the air supply joint 6.

The normally closed solenoid valve comprises a valve body 20, a valve core 21, an elastic component 22, an electromagnetic drive mechanism 23, a low-pressure side air inlet 24, a high-pressure side air inlet 25 and a sealing ring 26; the valve core 21 is arranged in the valve body 20; an elastic component 22 is arranged between the valve core 21 and the valve body 20; the electromagnetic drive mechanism 23 is connected to the valve core 21; low-pressure side air inlet 24 and high-pressure side air inlet 25 are arranged on both sides of the valve body 20; a plurality of sealing rings 26 are arranged on the valve core 21; at least one sealing ring 26 is arranged between the low-pressure side air inlet 24 and the high-pressure side air inlet 25, and the low-pressure side air inlet 24 and the high-pressure side air inlet 25 are not connected; when the electromagnetic drive mechanism 23 is started, the elastic component 22 is compressed, driving the valve core 21 to move, and the sealing ring 26 moves away from the low-pressure side air inlet 24 and the high-pressure side air inlet 25; the low-pressure side air inlet 24 and the high-pressure side air inlet 25 are connected The normally open solenoid valve comprises a valve body 20, a valve core 21, an elastic component 22, an electromagnetic drive mechanism 23, a low-pressure side air inlet 24, a high-pressure side air inlet 25 and a sealing ring 26; the valve core 21 is arranged in the valve body 20; an elastic component 22 is arranged between the valve core 21 and the valve body 20; the electromagnetic drive mechanism 23 is connected to the valve core 21; a low-pressure side air inlet 24 and a high-pressure side air inlet 25 are arranged on both sides of the valve body 20; a plurality of sealing rings 26 are arranged on the valve core 21; there is no sealing ring 26 between the low-pressure side air inlet 24 and the high-pressure side air inlet 25; the low-pressure side air inlet 24 and the high-pressure side air inlet 25 are connected; when the electromagnetic drive mechanism 23 is started, the elastic component 22 is compressed, driving the valve core 21 to move, and the at least one sealing ring 26 is located between the low-pressure side air inlet 24 and the high-pressure side air inlet 25, and the low-pressure side air inlet 24 and the high-pressure side air inlet 25 are not connected.

The above-mentioned density relay intelligent calibration and monitoring device, the circuit module includes an electronic circuit board 27, a shell 28, a relay protection interface 29 and a background module communication network interface 30; the electronic circuit board 27 is arranged in the shell 28; the shell 28 is provided with a relay protection interface 29 and a background module communication network interface 30; the background module communication network interface 30 is connected to the background module 31; the density relay electrical interface 2, the first normally closed solenoid valve 11, the first normally open solenoid valve 12, the second normally closed solenoid valve 13 and the third normally closed solenoid valve 8 are all connected to the electronic circuit board 27.

In the above-mentioned density relay intelligent calibration and monitoring device, the background module 31 is a dedicated software system.

Installation steps of the density relay intelligent calibration monitoring device of the present invention:

1. Remove the electrical connection joint leading to the relay protection system on the electrical interface of the density relay that comes with the switchgear, and record the position of the density relay pointer;

2. Disassemble the density relay. Prevent damage to the density relay during disassembly. Wipe the density relay with alcohol, replace the corresponding sealing ring, and apply silicone grease on the sealing ring.

3. Install the density relay to the density relay interface and the density relay electrical interface of the present invention to ensure that it maintains circuit communication with the circuit module;

4. Connect the switchgear butt joint of the present invention to the switchgear;

5. Connect the air supply interface of the present invention to the air supply port of the switch device, ensure that the valve of the air supply port of the switch device is in an open state, and observe that the pointer of the density relay is in the position before disassembly;

6. Install the electrical connection connector leading to the relay protection system on the relay protection interface of the present invention;

7. Connect the working power cord and communication cable of the present invention;

8. After establishing the communication channel, according to the actual situation, the background module can access the present invention, can read the temperature, pressure, density and other parameters of the present invention; can send the density relay verification command, and can receive the corresponding feedback response; can send the online monitoring command, and can receive the corresponding feedback response; can send the switch device air replenishment command, and can receive the corresponding feedback response; then the test is successful.

The working principle of the present invention under the online monitoring state:

1. The gas in the switchgear flows into the working gas chamber through the switchgear butt joint;

2. The gas then flows through the fourth ventilation channel and the first normally open solenoid valve into the detection gas chamber. The first normally open solenoid valve can ensure that the gas can enter the detection gas chamber without obstacles whether the present invention is powered by power or not, so that the density relay can work normally;

3. The gas enters the density relay through the density relay interface, so that it can sense the gas density value normally, and send a signal to the electronic circuit board when the gas density value decreases. The electronic circuit board ensures that the relay signal sent by the density relay can be accurately and without delay transmitted to the relay protection system through the relay protection interface in the state of no power supply and power supply. For the corresponding relay protection system, the existence of the present invention can be ignored and the normal operation is the same as before the present invention is installed;

4. The sensor installed in the detection gas chamber senses the density value of the gas, converts the value into an electrical signal and transmits it to the electronic circuit board. The electronic circuit board then transmits the density value to the software system through the background module communication network interface to display the density value, which represents the density value of the switchgear.

5. The present invention meets various requirements and indicators of the power industry under normal working conditions.

The working steps of the verification state of the present invention are:

When the insulation of the switchgear is in normal condition and the gas density is in normal condition, this step can be performed:

1. The software system sends a specific verification instruction to one or a batch of products that need to be verified. After receiving the instruction, the CPU on the electronic circuit board of the present invention starts to execute the command according to the regulations;

2. The circuit logic is controlled by the CPU on the electronic circuit board, which stores the current parameters of the sensor and switches to the density relay verification state to prevent false alarms of relay protection;

3. The CPU performs the following actions: close the first normally open solenoid valve, cut off the gas path, open the first normally closed solenoid valve, discharge a small amount of gas from the detection chamber, and reduce the pressure. At the same time, the CPU captures the contact change state of the density relay, records the parameter changes of the sensor in real time, and stores the parameter value of the sensor while the contact changes. This step continues until the pressure of the detection chamber drops below the rated contact action value of the density relay, and this step ends;

4. The CPU performs the following actions: the first normally open solenoid valve opens the second normally closed solenoid valve to replenish gas to the detection chamber, and the pressure increases. At the same time, the CPU captures the contact change state of the density relay, records the parameter changes of the sensor in real time, and stores the parameter value of the sensor while the contact changes. This step continues until the pressure of the detection chamber rises to the stored parameter value of step 3, and this step ends;

5. The CPU performs the following actions: close the second normally closed solenoid valve, open the first normally open solenoid valve, restore the original state, and the circuit logic switches to the online monitoring state through the CPU control circuit on the electronic circuit board, and sends a verification completion signal to the software system, and the entire verification state ends.

The working steps of the gas replenishing state of the present invention are:

1. Ensure that the air supply device has sufficient pressurized gas and adjust the expected pressure;

2. The software system sends specific instructions to the products that need to be refilled;

3. After receiving the instruction, the CPU on the electronic circuit board starts to execute the command according to the regulations;

4. The circuit logic is controlled by the CPU on the electronic circuit board, which stores the current parameters of the sensor and switches to the gas replenishment state to prevent false alarms of relay protection;

5. The CPU performs the following actions: the third normally closed solenoid valve is opened, the states of other solenoid valves remain unchanged, and the gas begins to automatically flow through the third normally closed solenoid valve, enters the detection gas chamber, enters the switch device docking joint through the first normally open solenoid valve, and then directly enters the switch device;

6. When the gas reaches equilibrium, the inflation is completed, and the software system sends a gas replenishment completion instruction. After receiving the instruction, the CPU on the electronic circuit board of the present invention closes the third normally closed solenoid valve, and the circuit logic is controlled by the CPU on the electronic circuit board, switches to the online monitoring state, and sends a gas filling completion signal to the background software system;

7. Close the air replenishing device and the entire inflation process is completed.

Verify the working steps of the present invention:

1. Connect the calibrated special high-precision instrument to the gas supply joint of the present invention through a quick connector, and connect the electrical connector of the high-precision instrument to the electrical connector of the corresponding electronic circuit board part;

2. Use a high-precision instrument to send a specific calibration instruction to the product that needs to be calibrated through an electrical connector. After receiving the instruction, the CPU on the electronic circuit board of the present invention starts to execute the command according to the regulations;

3. The circuit logic is controlled by the CPU on the electronic circuit board, which stores the current parameters of the sensor, switches to a high-level verification state, eliminates false alarms of relay protection, and returns status information to the background software system;

4. The CPU performs the following actions: opening the third normally closed solenoid valve, closing the first normally open solenoid valve, cutting off the gas path, opening the first normally open solenoid valve, and allowing a small amount of gas in the detection chamber to be discharged until the pressure drops to 0. The high-precision instrument automatically reads the gas density of the present invention through communication, and compares it point by point with the gas density measured by the dedicated high-precision instrument itself, forming a curve and storing it inside the high-precision instrument for export;

5. The CPU performs the following actions: close the first normally closed solenoid valve, open the second normally closed solenoid valve, replenish gas to the detection gas chamber, and increase the pressure to the pressure before the calibration start. The high-precision instrument automatically reads the gas density of the present invention through communication, and compares it point by point with the gas density measured by the dedicated high-precision instrument itself to form a curve stored in the high-precision instrument for export;

6. The CPU performs the following actions: close the third normally closed solenoid valve, the second normally closed solenoid valve, open the first normally open solenoid valve, switch to the online monitoring state, and notify the high-precision instrument that the operation is completed. At this time, you can unplug the electrical connector of the high-precision instrument and unplug the quick connector, and the entire calibration process is completed.

The intelligent calibration and monitoring device for a density relay and the gas supply calibration method thereof of the present invention realize online monitoring, intelligent calibration, and integrated gas supply functions, and intelligently judge the accuracy of the density relay, and are necessary means for realizing a networked online intelligent calibration and monitoring system in the electric power industry; they can perform batch calibration, and improve the calibration efficiency of the density relay, from the calibration speed of one density relay per hour to the calibration speed of 1,000 density relays in 5 minutes. The efficiency is improved to the extreme, and the impact on normal production is greatly reduced; the high voltage can be energized without the need for manual on-site operations, which fundamentally eliminates the occurrence of personal safety accidents on-site with high voltage; it can be installed at high altitudes or dangerous locations that cannot be reached by daily maintenance, to achieve no-dead-angle monitoring and verification of electricity; intelligent verification and programmed control are achieved in the high voltage energized state, and through circuit state conversion, errors in traditional human operation steps are eliminated, which lead to false alarm signals entering the relay protection system and causing additional accidents; compared with traditional verification methods, the density relay intelligent verification and monitoring device of the present invention saves a lot of gas and prevents gas waste; the verification results are intelligently generated into reports through the background dedicated software, without the need for traditional personnel entry, saving manpower; it can intelligently test the reliability of each component of itself, form a detection log report, and store it in the background software system.

The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. Intelligent verification monitoring device of density relay, its characterized in that: the device comprises a mechanical module, a circuit module and a background module; the mechanical module is connected with the circuit module; the circuit module is connected with the background module through a network; the mechanical module is connected with the background module through the circuit module and can normally communicate with the background module;

The mechanical module comprises a density relay interface, a density relay electrical interface, a detection air chamber, a working air chamber, a switching equipment butt joint and an air supplementing joint; the density relay interface and the density relay electrical interface are connected with the density relay; the density relay interface is connected with the detection air chamber; the detection air chamber is connected with the working air chamber through an air passage pipeline; a third normally closed electromagnetic valve and a sensor are arranged in the detection air chamber; an electromagnetic valve group is arranged in the working gas chamber; the working air chamber is connected with a switching device butt joint; the detection air chamber is connected with an air supplementing joint; the density relay electrical interface is connected with the circuit module; the third normally closed electromagnetic valve and the electromagnetic valve group are respectively connected with the circuit module; the third normally closed electromagnetic valve is connected with a seventh gas circuit pipeline; the seventh gas circuit pipeline is connected with the gas supplementing joint;

The electromagnetic valve group comprises a first normally-closed electromagnetic valve, a first normally-open electromagnetic valve and a second normally-closed electromagnetic valve; the detection air chamber is connected with the working air chamber through a first air passage pipeline, a third air passage pipeline and a fifth air passage pipeline; the first normally closed electromagnetic valve is connected with the first air passage pipeline and the second air passage pipeline respectively; the second gas path pipeline is communicated with the outside; the first normally open electromagnetic valve is respectively connected with the third air passage pipeline and the fourth air passage pipeline; the second normally closed electromagnetic valve is respectively connected with the fifth gas path pipeline and the sixth gas path pipeline; the fourth gas path pipeline is connected with the sixth gas path pipeline and then is connected with a butt joint of the switching equipment;

The circuit module comprises an electronic circuit board, a shell, a relay protection interface and a background module communication network interface; the electronic circuit board is arranged in the shell; the shell is provided with a relay protection interface and a background module communication network interface; the background module communication network interface is connected with the background module; the density relay electrical interface, the first normally-closed electromagnetic valve, the first normally-open electromagnetic valve, the second normally-closed electromagnetic valve and the third normally-closed electromagnetic valve are all connected with the electronic circuit board;

the background module is a software system, and the normally closed electromagnetic valve comprises a valve body, a valve core, an elastic part, an electromagnetic driving mechanism, a low-pressure side air inlet, a high-pressure side air inlet and a sealing ring; the valve core is arranged in the valve body; an elastic part is arranged between the valve core and the valve body; the electromagnetic driving mechanism is connected with the valve core; the two sides of the valve body are provided with a low-pressure side air inlet and a high-pressure side air inlet; a plurality of sealing rings are arranged on the valve core; at least one sealing ring is arranged between the low pressure side air inlet and the high pressure side air inlet, and the low pressure side air inlet and the high pressure side air inlet are not communicated; when the electromagnetic driving mechanism is started, the elastic part is compressed to drive the valve core to move, and the low-pressure side air inlet is communicated with the high-pressure side air inlet;

the normally open electromagnetic valve comprises a valve body, a valve core, an elastic part, an electromagnetic driving mechanism, a low-pressure side inlet, a high-pressure side inlet and a sealing ring; the valve core is arranged in the valve body; an elastic part is arranged between the valve core and the valve body; the electromagnetic driving mechanism is connected with the valve core; the two sides of the valve body are provided with a low-pressure side air inlet and a high-pressure side air inlet; a plurality of sealing rings are arranged on the valve core; the low pressure side inlet is communicated with the high pressure side inlet; when the electromagnetic driving mechanism is started, the elastic component is compressed to drive the valve core to move, and at least one sealing ring is positioned between the low-pressure side air inlet and the high-pressure side air inlet, and the low-pressure side air inlet is not communicated with the high-pressure side air inlet.

2. A method of calibrating a density relay using the intelligent calibration monitoring apparatus of a density relay of claim 1, comprising the steps of:

(1) The software system sends a verification command to one or a batch of products to be verified, and a CPU on the electronic circuit board starts to execute the command according to the regulation after receiving the command;

(2) The circuit logic is controlled by a CPU on the electronic circuit board, stores the current parameters of the sensor, and switches to the density relay verification state, so that relay protection false alarm is avoided;

(3) The CPU performs the following actions: closing a first normally open electromagnetic valve, cutting off a gas path, opening the first normally closed electromagnetic valve, enabling the gas in the detection gas chamber to be discharged in a trace amount, reducing the pressure, capturing the contact change state of the density relay by a CPU, recording the parameter change of the sensor in real time, storing the parameter value of the sensor while the contact is changed, and ending the step until the pressure of the detection gas chamber is reduced below the rated contact action value of the density relay;

(4) The CPU performs the following actions: the first normally-open electromagnetic valve is opened, the second normally-closed electromagnetic valve is opened, the gas is supplemented to the detection gas chamber, the pressure is increased, meanwhile, the CPU captures the contact point change state of the density relay, the parameter change of the sensor is recorded in real time, the parameter value of the sensor is stored while the contact point is changed, the step is continued until the pressure of the detection gas chamber is increased to the stored parameter value in the step (3), and the step is ended;

(5) The CPU performs the following actions: closing the electromagnetic valve of the second normally-closed electromagnetic valve, opening the first normally-open electromagnetic valve, recovering the original state, switching the circuit logic to an on-line monitoring state through a CPU control circuit on the electronic circuit board, sending a verification completion signal to the software system, and ending the whole verification state.

3. A method of supplementing air using the intelligent verification monitoring device of a density relay of claim 1, comprising the steps of:

(1) Connecting the air supplementing device with the air supplementing interface to ensure that the air supplementing device has enough pressure air and the expected pressure is adjusted;

(2) The software system sends instructions to products needing air supplement;

(3) After receiving the instruction, a CPU on the electronic circuit board starts executing the instruction according to the stipulation;

(4) The circuit logic is controlled by a CPU on the electronic circuit board, stores the current parameters of the sensor, and switches to an air supplementing state so as to stop relay protection false alarm;

(5) The CPU performs the following actions: opening a third normally closed electromagnetic valve, keeping the states of other electromagnetic valves unchanged, enabling gas to automatically flow through the third normally closed electromagnetic valve, entering a detection air chamber, entering a butt joint of switching equipment through the first normally open electromagnetic valve, and then directly entering the switching equipment;

(6) After the gas reaches balance, the software system sends a gas filling completion instruction, a CPU on the electronic circuit board receives the instruction and then closes the third normally closed electromagnetic valve, and the circuit logic is controlled by the CPU on the electronic circuit board to switch to an on-line monitoring state and send a gas filling completion signal to the background software system;

(7) Closing the air supplementing device, and ending the whole air charging process.

4. A method of using the check density relay intelligent check monitoring device of claim 1, comprising the steps of:

(1) The calibrated high-precision instrument is connected to the air supplementing joint through a quick connector, and an electric connector of the high-precision instrument is connected to an electric connector of a corresponding electronic circuit board part;

(2) The high-precision instrument sends a verification command to a product to be verified through the electric connector, and a CPU on the electronic circuit board starts to execute the command according to the regulation after receiving the command;

(3) The path logic is controlled by a CPU on the electronic circuit board, stores the current parameters of the sensor, switches to a high-level verification state, stops relay protection false alarm, and returns state information to the background software system;

(4) The CPU performs the following actions: opening a third normally closed electromagnetic valve, closing a first normally open electromagnetic valve, cutting off a gas path, opening the first normally open electromagnetic valve, enabling the gas in the detection gas chamber to be discharged in a trace amount until the pressure is reduced to 0, automatically reading the gas density by a high-precision instrument through communication, comparing the gas density with the gas density measured by the high-precision instrument, and storing a formed curve in the high-precision instrument for export;

(5) The CPU performs the following actions: closing the first normally closed electromagnetic valve, opening the second normally closed electromagnetic valve, supplementing gas to the detection air chamber, increasing the pressure to the pressure before verification starting, automatically reading the gas density by the high-precision instrument through communication, comparing the gas density with the gas density measured by the high-precision instrument point by point, and storing a formed curve in the high-precision instrument for export;

(6) The CPU performs the following actions: and closing the third normally-closed electromagnetic valve, opening the first normally-closed electromagnetic valve, switching to an on-line monitoring state, informing the high-precision instrument of finishing the operation, pulling out an electrical connector of the high-precision instrument at the moment, pulling out a quick connector, and ending the whole verification process.