A multi-functional density relay calibrator

Abstract

This utility model relates to a multifunctional density relay calibrator, including a gas supply unit comprising a gas storage tank and a gas delivery pipeline; a pressure regulating unit comprising an electro-proportional valve, the inlet of which is connected to the gas delivery pipeline, and the outlet of which is connected to a four-way connector, the other three ports of which are respectively connected to a pressure sensor, a test port, and a test port. Test ports one and two are each used to connect to a density relay to be calibrated; and a control and monitoring unit connected to the pressure sensor and the electro-proportional valve. The two calibration pipelines use the same electro-proportional valve, and the two outlets of the electro-proportional valve provide gas at a set pressure to the two density relays to be tested, ensuring good consistency, high reliability, and reduced equipment costs. A one-way valve is directly used between the external gas source inlet and the gas storage tank to prevent gas backflow, resulting in low cost and high reliability.

Description

Technical Field

[0001] This utility model relates to the field of power equipment testing technology, specifically to a multi-functional density relay calibrator. Background Technology

[0002] In the operation of power systems, density relays, as key components ensuring the safe and stable operation of gas-insulated equipment (such as SF6 circuit breakers), play a crucial role in monitoring gas density. If a density relay malfunctions or its performance is inaccurate, it may lead to a decline in the insulation performance of the gas-insulated equipment, or even trigger a serious power accident. For example, a fully automatic density relay calibration device disclosed in utility model patent CN211853529U, in one embodiment, is equipped with two measurement lines capable of calibrating two gas density relays. Each measurement line uses an electro-proportional valve and a pressure sensor, with the two electro-proportional valves connected together and each measurement line connected to its corresponding pressure sensor. For frequent simultaneous multi-channel measurements, using two sets of electro-proportional valves and pressure sensors obviously increases cost and reduces reliability. Utility Model Content

[0003] The purpose of this invention is to provide a multifunctional density relay calibrator that optimizes the measurement circuit and solves the problems of high cost and low reliability mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The multi-functional density relay calibrator includes a gas supply unit, which includes a gas storage tank and a gas pipeline.

[0006] The pressure regulating unit includes an electro-proportional valve. The inlet of the electro-proportional valve is connected to the gas supply pipeline. The outlet of the electro-proportional valve is connected to a four-way pipe connector. The other three ports of the four-way pipe connector are respectively connected to pressure sensor one, test port one, and test port two. Test port one and test port two are respectively used to connect a density relay to be calibrated.

[0007] The control and monitoring unit is connected to the pressure sensor and the electro-proportional valve.

[0008] Furthermore, a four-way pipe connector 2 is connected to the gas nozzle of the gas storage tank. One air inlet of the four-way pipe connector 2 is used to connect to a one-way valve 1. The other side of the one-way valve 1 is connected to a three-way pipe connector 1. The other two ports of the three-way pipe connector 1 are respectively connected to the gas source inlet and the exhaust solenoid valve. The exhaust solenoid valve is connected to the control and monitoring unit.

[0009] The outlet of the four-way pipe connector 2 is connected to the gas pipeline, and the four-way pipe connector 2 is also connected to a pressure gauge.

[0010] Furthermore, the gas storage tank is connected to a second pressure sensor for monitoring the internal pressure of the gas storage tank, and the second pressure sensor is connected to the control and monitoring unit.

[0011] Furthermore, the gas storage tank is connected to a pressurization pipeline, which includes a filter, a pressurization pump, and a second one-way valve. The filter is connected to the air inlet of the pressurization pump, and the second one-way valve is connected to the air outlet of the pressurization pump. The pressurization pump is connected to a control and monitoring unit.

[0012] Furthermore, the filter is a primary filter, and the pressurization pipeline also includes a secondary filter, which is installed between the one-way valve and the gas storage tank.

[0013] Furthermore, the exhaust port of the electro-proportional valve is connected to a two-way pipe connector, and the other two ports of the two-way pipe connector are respectively connected to the exhaust solenoid valve and the exhaust port.

[0014] The beneficial effects of this utility model are:

[0015] (1) It is equipped with two calibration lines, which can connect two density relays to be tested at the same time. The two calibration lines use the same electro-proportional valve. The two outlets of the electro-proportional valve provide gas at the set pressure to the two density relays to be tested respectively. It has good consistency, high reliability, and can also reduce equipment costs. It has good advantages for situations where multiple density relays are usually calibrated at the same time.

[0016] (2) An air storage tank is installed in the gas circuit unit, which can store an appropriate amount of gas to ensure a smooth and stable gas supply from the gas source to the electric proportional valve.

[0017] (3) A one-way valve is directly used between the external gas source inlet and the gas storage tank to prevent gas backflow. The structure is simple, the cost is low, and the reliability is high. Attached Figure Description

[0018] Figure 1 This is the schematic diagram of a multi-functional density relay calibrator.

[0019] 1. Electro-proportional valve; 2. Four-way connector 1; 3. Pressure sensor 1; 4. Test port 1; 5. Test port 2; 6. Control and monitoring unit; 7. Gas tank; 8. Four-way connector 2; 9. Check valve 1; 10. Pressure gauge; 11. T-connector 1; 12. Gas source inlet; 13. Exhaust solenoid valve; 14. Pressure sensor 2; 15. Primary filter; 16. Booster pump; 17. Check valve 2; 18. Secondary filter; 19. T-connector 2; 20. Exhaust port. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0021] Embodiments of this utility model:

[0022] like Figure 1 As shown, the multi-functional density relay calibrator includes a gas supply unit, a pressure regulating unit, and a control and monitoring unit 6. The gas supply unit is used to provide pressurized gas for testing, the pressure regulating unit is used to adjust the output gas to the required pressure, and the control and monitoring unit 6 is used to collect gas pressure at several nodes and send adjustment commands to the pressure regulating unit.

[0023] The gas supply unit includes a gas storage tank 7 and a gas transmission pipeline; the gas transmission pipeline is connected to the gas nozzle of the gas storage tank 7, and the other end of the gas transmission pipeline goes to the pressure regulating unit, which adjusts the output pressure.

[0024] The pressure regulating unit includes an electro-proportional valve 1. The inlet of the electro-proportional valve 1 is connected to the gas supply pipeline, and the outlet of the electro-proportional valve 1 is connected to a four-way connector 2. The other three ports of the four-way connector 2 are respectively connected to a pressure sensor 3, a test port 4, and a second test port 5. Test ports 4 and 5 are each used to connect to a density relay to be calibrated. Test ports 4 and 5 are both equipped with self-locking nuts for easy connection. Both test ports 4 and 5 are connected to the four-way connector 2 via air pipes. The electro-proportional valve 1 also has an outlet for venting after testing.

[0025] The control and monitoring unit 6 includes a microprocessor and integrates data acquisition, processing, and control functions. The control and monitoring unit 6 is connected to the pressure sensor 3 and the electro-proportional valve 1. The pressure sensor 3 monitors the gas pressure at the four-way connector 2 and provides real-time feedback to the control and monitoring unit 6, achieving closed-loop pressure control and ensuring the accuracy and stability of the output pressure.

[0026] A four-way connector 2 8 is connected to the gas nozzle of the gas tank 7. One inlet of the four-way connector 2 8 is connected to a one-way valve 9. The other side of the one-way valve 9 is connected to a three-way connector 11. The other two ports of the three-way connector 11 are connected to the gas source inlet 12 and the exhaust solenoid valve 13, respectively. The exhaust solenoid valve 13 is connected to the control and monitoring unit 6. The exhaust solenoid valve 13 can quickly discharge residual gas in the gas path when needed. An external gas source can be used to supply gas, which enters the gas tank 7 through the three-way connector 11, the one-way valve 9, and the four-way connector 2 8.

[0027] The gas storage tank 7 can store a certain amount of gas, providing a stable gas source for the calibration process.

[0028] The outlet of the four-way connector 28 is connected to one end of the gas transmission pipeline. The four-way connector 28 is also connected to a pressure gauge 10. The pressure gauge 10 is used to display the gas pressure inside the tank in real time, so that the operator can intuitively understand the pressure situation inside the gas storage tank 7.

[0029] The gas storage tank 7 is connected to a pressure sensor 14, which is used to monitor the internal pressure of the gas storage tank 7. The pressure sensor 14 is connected to the control and monitoring unit 6.

[0030] The gas storage tank 7 is connected to a pressurization pipeline, which includes a filter, a pressurization pump 16, and a second check valve 17. The filter is a primary filter 15, which is connected to the inlet of the pressurization pump 16. The primary filter 15 acts as a pre-filter to ensure the cleanliness of the gas source. The second check valve 17 is connected to the outlet of the pressurization pump 16; the pressurization pump 16 is connected to the control and monitoring unit 6. In scenarios where it is inconvenient to use an external gas source, the pressurization pump 16 can be used to supply gas to pressurize the gas in the gas storage tank 7. The second check valve 17 prevents gas backflow during pressurization.

[0031] The pressurization pipeline also includes a secondary filter 18, which is located between the one-way valve 17 and the air tank 7. The secondary filter 18 is a quick-tight filter, which is a purchased component in the existing technology.

[0032] The exhaust port 20 of the electric proportional valve 1 is connected to a three-way pipe connector 19. The other two ports of the three-way pipe connector 19 are connected to the exhaust solenoid valve 13 and the exhaust port 20, respectively. The exhaust port 20 (male) is used to discharge excess gas during the calibration process to ensure the normal operation of the gas circuit system.

[0033] In this embodiment, the terms "four-way connector one" and "four-way connector two" are used to distinguish between the two four-way connectors; similarly, "one-way valve one" and "one-way valve two," and "pressure sensor one" and "pressure sensor two" are also used to distinguish between them.

[0034] The working principle of this multi-functional density relay calibrator:

[0035] (1) Connection and preparation: Connect the air inlet 12 of the calibrator to an external air source, and connect test port 4 and test port 5 to the density relay to be calibrated. Turn on the power of the calibrator, and the system will perform a self-test to check whether each component is working properly.

[0036] (2) Air Intake and Storage: When there is an external air source, open the external air source valve, and the gas enters the storage tank 7 through the air inlet (male), three-way pipe connector 11, and one-way valve 9. The pressure gauge 10 on the storage tank 7 displays the pressure inside the tank in real time, and the pressure sensor 14 transmits the pressure data to the control and monitoring unit 6. Pressure regulation and gas distribution can only be carried out after the pressure inside the storage tank 7 reaches a certain value. When the pressurization pump 16 is used to supply gas, the gas enters the storage tank 7 through the primary filter 15, the pressurization pump 16, the one-way valve 17, and the secondary filter 18. When the pressure reaches the set value, the pressurization pump 16 stops supplying gas.

[0037] (3) Pressure Regulation: Based on the requirements of the density relay to be calibrated, parameters such as the target pressure value are set on the human-machine interface of the control and monitoring unit 6. The control and monitoring unit 6 controls the start of the electro-proportional valve 1, and the gas enters the electro-proportional valve 1 through the gas storage tank 7 and the four-way pipe connector 2. The electro-proportional valve 1 adjusts the output pressure according to the control signal, and the pressure sensor 3 monitors the output pressure in real time and feeds the data back to the control and monitoring unit 6. The control and monitoring unit 6 adjusts the control signal of the electro-proportional valve 1 according to the feedback data to achieve precise regulation of the output pressure.

[0038] (4) Verification Test: The regulated gas enters the density relay through test port 4 and test port 5 to verify the density relay under simulated actual working conditions. During this process, the control and monitoring unit 6 monitors changes in parameters such as pressure in real time to determine whether the performance of the density relay meets the requirements. After verification, the gas in the gas path is discharged through exhaust port 20.

[0039] This utility model of a multi-functional density relay calibrator has the following features:

[0040] Multifunctional integration: This utility model calibrator integrates multiple functions such as air intake, air storage, pressure regulation, and test output, and can fully simulate actual working conditions to calibrate various parameters of density relays, meeting the calibration needs of different types of density relays.

[0041] High-precision measurement: High-precision pressure sensors can be used, combined with real-time pressure monitoring and feedback control, to accurately measure and adjust gas pressure. Closed-loop control effectively improves the accuracy and reliability of calibration results.

[0042] Ease of operation: The equipment adopts a modular design, and the connection between components is simple and reliable. The human-machine interface is user-friendly, allowing operators to easily set verification parameters and control the verification process, greatly improving verification efficiency and reducing the professional skills required of operators.

[0043] Safety and reliability: The gas circuit system is equipped with safety components such as one-way valves and exhaust solenoid valves to prevent gas backflow and residual gas from affecting the calibration results.

[0044] It is applicable to multiple situations: when there is an external gas source, it can be used for testing, regardless of the type of gas. When there is no external gas source, an internal pressurization pump is used to supply gas as a gas source.

[0045] Smooth and stable gas supply: An air storage tank is installed in the gas circuit unit to store an appropriate amount of gas, ensuring a smooth and stable gas supply to the electric proportional valve.

[0046] It can be measured with a variety of gases: other gases such as N2, Air, O2, CO2, etc. can be used to replace SF6 gas for measurement, without the disadvantages caused by using SF6 gas, such as: SF6 gas is not environmentally friendly, SF6 decomposition products are highly toxic, and the cost is also high.

Claims

1. A multi-functional density relay calibrator, characterized by: It includes a gas supply unit, which includes a gas storage tank and a gas pipeline; The pressure regulating unit includes an electro-proportional valve. The inlet of the electro-proportional valve is connected to the gas supply pipeline. The outlet of the electro-proportional valve is connected to a four-way pipe connector. The other three ports of the four-way pipe connector are respectively connected to pressure sensor one, test port one, and test port two. Test port one and test port two are respectively used to connect a density relay to be calibrated. The control and monitoring unit is connected to the pressure sensor and the electro-proportional valve.

2. The multi-functional density relay calibrator according to claim 1, wherein: The gas tank is connected to a four-way pipe connector 2 at the gas nozzle. One air inlet of the four-way pipe connector 2 is used to connect to a one-way valve 1. The other side of the one-way valve 1 is connected to a three-way pipe connector 1. The other two ports of the three-way pipe connector 1 are respectively connected to the gas source inlet and the exhaust solenoid valve. The exhaust solenoid valve is connected to the control and monitoring unit. The outlet of the four-way pipe connector 2 is connected to the gas pipeline, and the four-way pipe connector 2 is also connected to a pressure gauge.

3. The multi-functional density relay calibrator of claim 1, wherein: The gas storage tank is connected to a second pressure sensor for monitoring the internal pressure of the gas storage tank. The second pressure sensor is connected to the control and monitoring unit.

4. The multifunctional density relay calibrator according to claim 1, characterized in that: The gas storage tank is connected to a pressurization pipeline, which includes a filter, a pressurization pump, and a second one-way valve. The filter is connected to the air inlet of the pressurization pump, and the second one-way valve is connected to the air outlet of the pressurization pump. The pressurization pump is connected to a control and monitoring unit.

5. The multi-functional density relay calibrator of claim 4, wherein: The filter is a primary filter, and the pressurization pipeline also includes a secondary filter, which is installed between the one-way valve and the gas storage tank.

6. The multi-functional density relay calibrator of claim 1, wherein: The exhaust port of the electro-proportional valve is connected to a two-way pipe connector, and the other two ports of the two-way pipe connector are respectively connected to the exhaust solenoid valve and the exhaust port.

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