Pressure protection device for integral sealing test of transformer and use method of pressure protection device

Abstract

The invention provides a transformer integral sealing test pressure protection device and a use method thereof.The transformer integral sealing test pressure protection device comprises an inlet ball valve connected with an air supply pipeline, one branch of the pipeline behind the inlet ball valve is connected with an inflation electromagnetic valve, and a buffer tank and an outlet ball valve are sequentially installed on the pipeline behind the inflation electromagnetic valve; the buffer tank is provided with an outlet pressure transmitter, and an outlet ball valve is connected with a transformer integral sealing test inflation interface; the inflation electromagnetic valve and the outlet pressure transmitter are respectively connected with an industrial automation controller and a power supply module; when the pressure value in the oil conservator capsule, namely the pressure value monitored by the outlet pressure transmitter, reaches the target pressure value of the integral sealing test of the transformer set by the device, the industrial automatic controller controls the inflation electromagnetic valve to be closed and the inflation loop to be closed, so that inflation protection of the oil conservator capsule is realized; and the risk that the transformer bears larger pressure due to excessive inflation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing test, and in particular to a transformer integral sealing test pressure protection device and a use method thereof. Background Art

[0002] According to DL / T 596-2021 Preventive Test Procedure for Power Equipment, 110kV and above oil-immersed power transformers need to undergo an overall sealing inspection test after A-level maintenance or when necessary, and a pressure of 0.035MPa needs to be applied to the top of the oil conservator to verify the overall sealing performance of the transformer. In the actual transformer overall sealing inspection test, our usual practice is to fill the oil conservator capsule with dry air to the specified pressure. Since the air intake flow of the capsule, the judgment of the internal pressure of the capsule, and the timing of stopping the inflation of the capsule are all controlled manually, there is a process for human consciousness to react to manual operation, and there is a risk of excessive inflation causing the transformer to be subjected to greater pressure. Therefore, it is very important to develop a transformer overall sealing test pressure protection device and its use method to effectively avoid the risk of the transformer being subjected to greater pressure due to excessive inflation of the oil conservator capsule and improve the efficiency of the transformer overall sealing test. Summary of the invention

[0003] The purpose of the present invention is to provide a transformer integral seal test pressure protection device and a method of using the same. When the pressure value in the oil storage tank capsule, i.e., the pressure value monitored by the outlet pressure transmitter, reaches the transformer integral seal test target pressure value set by the device of the present application, the industrial automation controller controls the gas charging solenoid valve to close, and the gas charging circuit to close, thereby realizing the gas charging protection of the oil storage tank capsule, and avoiding the risk of excessive gas charging causing the transformer to bear a large pressure. In order to achieve the above technical features, the purpose of the present invention is achieved as follows: A transformer integral sealing test pressure protection device, comprising an inlet ball valve connected to an air supply pipeline, a branch of a pipeline after the inlet ball valve is connected to an air charging solenoid valve, a buffer tank and an outlet ball valve are sequentially installed on the pipeline after the air charging solenoid valve, an outlet pressure transmitter is installed on the buffer tank, and the outlet ball valve is connected to an air charging interface of the transformer integral sealing test; The inflation solenoid valve and the outlet pressure transmitter are connected to the industrial automation controller and the power module respectively.

[0004] Another branch of the pipeline after the inlet ball valve is connected to the exhaust solenoid valve, and the exhaust solenoid valve is connected to the industrial automation controller and the power module respectively.

[0005] The exhaust solenoid valve is connected to the muffler to reduce the noise of the exhaust port.

[0006] An inlet pressure transmitter is installed on the pipeline after the inlet ball valve and before the exhaust solenoid valve and the inflation solenoid valve. The inlet pressure transmitter is connected to the industrial automation controller and the power module respectively.

[0007] The industrial automation controller is connected to the touch screen via a serial communication interface.

[0008] The industrial automation controller is connected to a voice alarm.

[0009] A method for using a transformer integral sealing test pressure protection device comprises the following steps: S1: Connect a 220V / 50Hz power supply to the power module of the device of the present application; S2: Connecting the gas supply pipeline to the inlet pipeline of the device of the present application; S3: Connect the outlet pipe of the device of the present application to the charging interface of the transformer integral sealing test; S4: Open the inlet ball valve and the outlet ball valve; S5: Turn on the power switch and set the target pressure value of the transformer overall sealing test through the touch screen; S6: Sending instructions through the touch screen, the device of the present application starts to start running; S7: After the device of the present application starts to operate, the gas passes through the inlet ball valve, the inlet pressure transmitter, the charging solenoid valve, the buffer tank, the outlet pressure transmitter and the outlet ball valve through the connecting pipeline to inflate the transformer oil storage cabinet capsule; S8: When the pressure value in the capsule of the oil storage cabinet, i.e., the pressure value monitored by the outlet pressure transmitter, reaches the pressure value set by the device of the present application, the inflation solenoid valve is closed, and the inflation circuit is closed. At this time, the exhaust solenoid valve is automatically opened, and the gas charged from the inlet of the device of the present application is discharged through the inlet ball valve, the inlet pressure transmitter, the exhaust solenoid valve and the muffler to form an exhaust circuit, and the voice alarm issues a voice reminder at the same time; S9: Disconnect the gas supply pipeline from the inlet pipeline of the device of the present application and close the inlet ball valve; S10: After the transformer overall sealing test is completed, close the outlet ball valve, disconnect the outlet pipe of the device of the present application and the transformer overall sealing test charging interface; S11: Click the "stop button" on the touch screen to stop the device of this application; S12: Disconnect the power module of the device of the present application from the 220V / 50Hz power supply.

[0010] The present invention has the following beneficial effects: 1. The device of the present application installs an outlet pressure transmitter on the buffer tank, and transmits the data measured by the outlet pressure transmitter to the industrial automation controller, thereby realizing equivalent monitoring of the pressure value in the oil storage tank capsule. At the same time, the industrial automation controller controls the inflation solenoid valve and the exhaust solenoid valve according to the detection data, thereby realizing accurate control of the inflation pressure in the oil storage tank capsule, thereby avoiding the risk of excessive inflation due to human factors in the prior art causing the transformer to bear a large pressure; 2. When the pressure value in the oil storage tank capsule reaches the pressure value set by the device, the device of the present application can promptly close the inflation circuit and open the exhaust circuit to realize the pressure protection function; 3. When the device starts pressure protection, it can issue a voice alarm to remind on-site workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 A schematic structural diagram of a transformer integral sealing test pressure protection device provided by an embodiment of the present invention; Figure 2 A schematic diagram of a control panel of a transformer integral sealing test pressure protection device provided by an embodiment of the present invention; Figure 3 A block diagram of an electric control system of a control panel of a transformer integral sealing test pressure protection device provided by an embodiment of the present invention; In the figure: inlet ball valve 1, inlet pressure transmitter 2, exhaust solenoid valve 3, muffler 4, charging solenoid valve 5, buffer tank 6, outlet pressure transmitter 7, outlet ball valve 8, industrial automation controller 9, power module 10, touch screen 11, voice alarm 12, power switch 13. DETAILED DESCRIPTION

[0013] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0014] See attached Figure 1-3 In order to realize the above technical features, the purpose of the present invention is achieved as follows: A transformer integral seal test pressure protection device comprises an inlet ball valve 1 connected to an air supply pipeline, a branch of the pipeline after the inlet ball valve 1 is connected to an air charging solenoid valve 5, a buffer tank 6 and an outlet ball valve 8 are sequentially installed on the pipeline after the air charging solenoid valve 5, an outlet pressure transmitter 7 is installed on the buffer tank 6, and the outlet ball valve 8 is connected to the transformer integral seal test air charging interface; the air charging solenoid valve 5 and the outlet pressure transmitter 7 are respectively connected to an industrial automation controller 9 and a power module 10.

[0015] The device of the present invention comprises an inflation solenoid valve 5, a buffer tank 6, an outlet pressure transmitter 7, and an industrial automation controller 9; the industrial automation controller 9 converts the status signals of the outlet pressure transmitter 7 and the inflation solenoid valve 5 into data through an analog / digital conditioning conversion module to provide a data basis for the automatic control of the device of the present application; the buffer tank 6 is provided to stabilize the air pressure, avoid air pressure fluctuations in the pipeline, and make the monitored outlet pressure value more accurate; after the device of the present application starts to operate, the gas passes through the connecting pipeline through the inlet ball valve 1, the inflation solenoid valve 5, the buffer tank 6, the outlet pressure transmitter 7 and the outlet ball valve 8 to inflate the transformer oil storage cabinet capsule. When the pressure value in the oil storage cabinet capsule, that is, the pressure value monitored by the outlet pressure transmitter 7 reaches the target pressure value of the transformer overall sealing test set by the device of the present application, the industrial automation controller 9 controls the inflation solenoid valve 5 to close, and the inflation circuit to close, thereby realizing the inflation protection of the oil storage cabinet capsule and avoiding the risk of excessive inflation causing the transformer to be subjected to greater pressure.

[0016] Furthermore, another branch of the pipeline after the inlet ball valve 1 is connected to the exhaust solenoid valve 3, and the exhaust solenoid valve 3 is respectively connected to the industrial automation controller 9 and the power module 10. The industrial automation controller 9 controls the opening and closing of the inflation solenoid valve 5 and the exhaust solenoid valve 3 according to the generated control instructions through the digital / analog conditioning conversion module and the switch control module. Specifically, during the inflation process, the inflation solenoid valve 5 is opened and the exhaust solenoid valve 3 is closed. When the pressure value in the capsule of the oil storage cabinet, that is, the pressure value monitored by the outlet pressure transmitter 7 reaches the target pressure value of the transformer overall sealing test set by the device of this application, the industrial automation controller 9 controls the inflation solenoid valve 5 to close and the exhaust solenoid valve 3 to open, and the gas filled from the inlet of the device is discharged through the exhaust circuit formed by the inlet ball valve 1, the inlet pressure transmitter 2, and the exhaust solenoid valve 3.

[0017] Furthermore, the exhaust solenoid valve 3 is connected to the muffler 4 to reduce the noise of the exhaust port.

[0018] Furthermore, an inlet pressure transmitter 2 is installed on the pipeline after the inlet ball valve 1 and before the exhaust solenoid valve 3 and the inflation solenoid valve 5. The inlet pressure transmitter 2 is respectively connected to the industrial automation controller 9 and the power module 10. The inlet pressure transmitter 2 is set to monitor the inlet air pressure and convert the inlet air pressure into a standard electrical signal so that the industrial automation controller can realize the measurement and control function of the device.

[0019] Furthermore, the industrial automation controller 9 is connected to the touch screen 11 via a serial communication interface, and the target pressure parameters can be set and data can be displayed via the touch screen 11, thereby providing a good human-computer interaction interface.

[0020] Furthermore, the industrial automation controller 9 is connected to the voice alarm 12. When the pressure value in the oil storage cabinet capsule, that is, the pressure value monitored by the outlet pressure transmitter 7, reaches the target pressure value of the transformer overall sealing test set by the device of this application, the industrial automation controller 9 controls the charging solenoid valve 5 to close and the exhaust solenoid valve 3 to open. The gas filled in from the inlet of the device passes through the inlet ball valve 1, the inlet pressure transmitter 2, the exhaust solenoid valve 3 and the muffler 4 to form an exhaust circuit and is discharged. At the same time, the industrial automation controller 9 controls the voice alarm 12 to issue a voice reminder.

[0021] Furthermore, the power module 10 adopts a lithium battery pack of a well-known domestic and foreign brand, and the power supply mode is AC220V, 50Hz alternating current and a rechargeable lithium battery power supply mode, with a large battery capacity and a long battery life.

[0022] Furthermore, the hardware selection of the industrial automation controller 9: using a 32-bit processor; using a 16-bit high-precision ADC conversion module and a DAC conversion module, and using an effective signal conditioning circuit, the system has high accuracy; the switch control module uses a relay drive mode and an isolation drive mode, which can not only realize the on-off control of the circuit, but also reduce the interference to the system through the isolation effect of the relay, and can better ensure the safety and stable operation of the circuit; the serial communication module uses isolation technology and has strong anti-interference ability. The software development platform selects the controller manufacturer's own development platform, and uses C language and configuration software for programming.

[0023] A method for using a transformer integral sealing test pressure protection device comprises the following steps: S1: Connect a 220V / 50Hz power supply to the power module 10 of the device of the present application; S2: Connecting the gas supply pipeline to the inlet pipeline of the device of the present application; S3: Connect the outlet pipe of the device of the present application to the charging interface of the transformer integral sealing test; S4: Open the inlet ball valve 1 and the outlet ball valve 8; S5: Turn on the power switch and set the target pressure value of the transformer overall sealing test through the touch screen 11; S6: Sending a command via the touch screen 11, the device of the present application starts to operate; S7: After the device of the present application starts to operate, the gas passes through the connecting pipeline through the inlet ball valve 1, the inlet pressure transmitter 2, the charging solenoid valve 5, the buffer tank 6, the outlet pressure transmitter 7 and the outlet ball valve 8 to inflate the transformer oil storage cabinet capsule; S8: When the pressure value in the capsule of the oil storage cabinet, i.e., the pressure value monitored by the outlet pressure transmitter 7, reaches the pressure value set by the device of the present application, the inflation solenoid valve 5 is closed, and the inflation circuit is closed. At this time, the exhaust solenoid valve 3 is automatically opened, and the gas charged from the inlet of the device of the present application is discharged through the inlet ball valve 1, the inlet pressure transmitter 2, the exhaust solenoid valve 3 and the muffler 4 to form an exhaust circuit, and the voice alarm 12 issues a voice reminder at the same time; S9: Disconnect the gas supply pipeline from the inlet pipeline of the device of the present application and close the inlet ball valve 1; S10: After the transformer overall sealing test is completed, close the outlet ball valve 8, disconnect the outlet pipe of the device of the present application and the transformer overall sealing test charging interface; S11: Click the “stop button” on the touch screen 11, and the device of the present application stops running; S12: Disconnect the power module 10 of the device of the present application from the 220V / 50Hz power supply.

Claims

1. A transformer integral sealing test pressure protection device, characterized in that: It comprises an inlet ball valve (1) connected to an air supply pipeline, a branch of the pipeline after the inlet ball valve (1) is connected to an air charging solenoid valve (5), a buffer tank (6) and an outlet ball valve (8) are sequentially installed on the pipeline after the air charging solenoid valve (5), an outlet pressure transmitter (7) is installed on the buffer tank (6), and the outlet ball valve (8) is connected to an air charging interface of a transformer integral sealing test; The inflation solenoid valve (5) and the outlet pressure transmitter (7) are respectively connected to an industrial automation controller (9) and a power module (10).

2. A transformer integral sealing test pressure protection device according to claim 1, characterized in that: Another branch of the pipeline after the inlet ball valve (1) is connected to an exhaust solenoid valve (3), and the exhaust solenoid valve (3) is connected to the industrial automation controller (9) and the power module (10).

3. A transformer integral sealing test pressure protection device according to claim 2, characterized in that: The exhaust solenoid valve (3) is connected to the muffler (4) and is used to reduce the noise at the exhaust port.

4. A transformer integral sealing test pressure protection device according to claim 3, characterized in that: An inlet pressure transmitter (2) is installed on the pipeline after the inlet ball valve (1) and before the exhaust solenoid valve (3) and the inflation solenoid valve (5), and the inlet pressure transmitter (2) is respectively connected to the industrial automation controller (9) and the power module (10).

5. A transformer integral sealing test pressure protection device according to claim 4, characterized in that: The industrial automation controller (9) is connected to the touch screen (11) via a serial communication interface.

6. A transformer integral sealing test pressure protection device according to claim 5, characterized in that: The industrial automation controller (9) is connected to a voice alarm (12).

7. A method for using a transformer integral seal test pressure protection device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Connecting a 220V / 50Hz power source to a power module (10) of the device of the present application; S2: Connecting the gas supply pipeline to the inlet pipeline of the device of the present application; S3: Connect the outlet pipe of the device of the present application to the charging interface of the transformer integral sealing test; S4: Open the inlet ball valve (1) and the outlet ball valve (8); S5: Turn on the power switch and set the target pressure value of the transformer overall sealing test through the touch screen (11); S6: issuing a command via the touch screen (11), and the device of the present application starts to operate; S7: After the device of the present application starts to operate, the gas passes through the connecting pipeline through the inlet ball valve (1), the inlet pressure transmitter (2), the inflation solenoid valve (5), the buffer tank (6), the outlet pressure transmitter (7) and the outlet ball valve (8) to inflate the transformer oil storage cabinet capsule; S8: When the pressure value in the capsule of the oil storage tank, i.e., the pressure value monitored by the outlet pressure transmitter (7), reaches the pressure value set by the device of the present application, the charging solenoid valve (5) is closed, and the charging circuit is closed. At this time, the exhaust solenoid valve (3) is automatically opened, and the gas charged from the inlet of the device of the present application passes through the inlet ball valve (1), the inlet pressure transmitter (2), the exhaust solenoid valve (3) and the muffler (4) to form an exhaust circuit and is discharged. At the same time, the voice alarm (12) issues a voice reminder; S9: Disconnect the gas supply pipeline from the inlet pipeline of the device of the present application and close the inlet ball valve (1); S10: After the transformer overall sealing test is completed, close the outlet ball valve (8) to disconnect the outlet pipe of the device of the present application from the transformer overall sealing test gas charging interface; S11: Click the "stop button" on the touch screen (11), and the device of the present application stops running; S12: Disconnect the power module (10) of the device of the present application from the 220V / 50Hz power supply.

Images