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CN-121977819-A - Test equipment and method for response time of pressure release valve of transformer

CN121977819ACN 121977819 ACN121977819 ACN 121977819ACN-121977819-A

Abstract

The invention discloses test equipment and a test method for response time of a pressure release valve of a transformer. The invention relates to the technical field of pressure release valve tests of transformer components, and aims to solve the problem that the prior art cannot rapidly, accurately and automatically detect the opening response time of each pressure release valve, especially the critical 2ms threshold value, on a production line. The device comprises a control cabinet, an air storage tank, an air filling and exhausting electromagnetic valve, a pneumatic instantaneous opening butterfly valve, a high-speed pressure sensor, a laser position sensor and an oscilloscope. According to the invention, the pressure in the valve is synchronously detected by the laser position sensor and the high-speed pressure sensor, the accurate time sequence of mechanical action with the membrane disc is established, and the time difference is analyzed by using the oscilloscope, so that the quick, accurate and automatic test of the opening response time of the pressure release valve, especially the key index of 2ms, is realized.

Inventors

  • HU SHIHE
  • ZHANG BIN
  • ZHANG YANDAI
  • Fang Jiankai

Assignees

  • 沈阳德广电气科技有限公司

Dates

Publication Date
20260505
Application Date
20260313

Claims (8)

  1. 1. A test apparatus for transformer pressure relief valve response time, comprising: the control cabinet (1), the upper half part of the control cabinet (1) is provided with a test control touch screen (1.7) for embedding a control program and controlling each execution element of the equipment; The gas storage system comprises a gas storage tank (8), a gas storage tank gas-filling electromagnetic valve (14) connected to the gas inlet end of the gas storage tank (8) and a gas storage tank pressure sensor (7) for monitoring the internal pressure of the gas storage tank (8), wherein the control cabinet (1) is provided with a gas storage tank digital display pressure indicator (1.6) and a gas storage tank gas-filling start button (1.9) which are electrically connected with the gas storage tank gas-filling electromagnetic valve (14) and the gas storage tank pressure sensor (7) and are used for controlling the gas-filling process and displaying the gas storage tank pressure; The test execution and trigger unit comprises a pneumatic instantaneous butterfly valve (6) and a test operation button (1.4), wherein the input end of the pneumatic instantaneous butterfly valve (6) is connected with the air outlet end of the air storage tank (8) through an air pressure output pipeline (5), and the output end of the pneumatic instantaneous butterfly valve is connected to the mounting interface of the tested pressure release valve (2); The signal detection and acquisition unit comprises a laser position sensor (2.2) for detecting the displacement of the pressure release valve membrane disc (2.1), a high-speed pressure sensor (4) for detecting the pressure in the air pressure output pipeline (5) and an oscilloscope (1.13), wherein the laser position sensor (2.2) is fixed through a mounting bracket (2.3), a detection focus of the laser position sensor is opposite to the membrane disc (2.1) of the tested pressure release valve (2) arranged above the test bench bracket (3), and output ends of the laser position sensor (2.2) and the high-speed pressure sensor (4) are electrically connected with the oscilloscope (1.13), and the oscilloscope (1.13) is used for acquiring and displaying pressure waveforms and displacement signal waveforms.
  2. 2. Test apparatus for the response time of a pressure relief valve of a transformer according to claim 1, characterized in that said control cabinet (1) is further provided with: a test run display light (1.3) associated with the test run button (1.4) for displaying a test run state; A test emergency stop button (1.5) for emergency stopping the whole test system; The gas tank gas filling emergency stop button (1.8) is used for emergency stop of the gas tank (8) gas filling process; the gas storage tank gas filling stop button (1.11) is used for manually stopping the gas storage tank (8) gas filling process; A gas storage tank gas filling stop indicator lamp (1.12) and a gas storage tank gas filling operation indicator lamp (1.10) corresponding to the states of the gas storage tank gas filling stop button (1.11) and the gas storage tank gas filling start button (1.9); test stop display lamp (1.1) and test stop button (1.2).
  3. 3. The test device for the response time of the pressure release valve of the transformer according to claim 2, wherein the gas tank (8) is further provided with a gas tank pressure gauge (9) for visually displaying the pressure, a gas tank safety valve (10) for overpressure protection, a gas tank manual exhaust valve (11) for manual exhaust, a gas tank drain valve (12) for drainage, a gas tank air-filling ball valve (13) for air-filling on-off control, and a gas tank air-discharging solenoid valve (15) for program control air-discharging.
  4. 4. A test apparatus for a transformer pressure relief valve response time according to claim 3, characterized in that the air pressure output line (5) is further provided with a test residual air pressure vent solenoid valve (16) and a test residual air pressure vent manual valve (17) for venting the post-test residual air pressure in the line, and a test residual air pressure gauge (18) for monitoring the partial air pressure.
  5. 5. The test device for the response time of a pressure relief valve of a transformer according to claim 4, characterized in that the pressure relief valve under test (2) is fixedly mounted by bolts on a mounting flange (2.4) of the product under test welded to a test stand bracket (3) with its injection port facing the laser position sensor (2.2).
  6. 6. The test device for the response time of a pressure relief valve of a transformer according to claim 5, characterized in that the number of the pneumatic snap-open butterfly valves (6) is two, symmetrically connected to the pneumatic output line (5).
  7. 7. The test device for a transformer pressure relief valve response time according to claim 6, wherein the laser position sensor (2.2) is configured such that its output signal jumps from low level to high level when the displacement amount of the pressure relief valve diaphragm (2.1) is greater than 2 mm.
  8. 8. A test method for response time of a pressure relief valve of a transformer for a test apparatus as claimed in claim 7, comprising the steps of: Step one, powering on a system and initial preparation, namely switching on a power supply of the equipment, fixedly mounting a tested pressure release valve (2) on a tested product mounting flange (2.4) on a test bench bracket (3) through bolts, ensuring that a fuel injection port of the tested pressure release valve faces a laser position sensor (2.2), unscrewing a test emergency stop button (1.5) and a gas storage tank air-filling emergency stop button (1.8), switching on the power supply of an oscilloscope (1.13) and a test control touch screen (1.7) and starting a test program, and confirming that a pneumatic instantaneous opening butterfly valve (6), a test residual air pressure exhaust manual valve (17), a gas storage tank manual exhaust valve (11) and a gas storage tank drain valve (12) are all in a closed state; Setting a pressure alarm value of a gas tank digital display pressure indicator (1.6) to be a preset pressure value on a test control touch screen (1.7), operating a gas tank gas filling start button (1.9) on a control cabinet (1), starting a gas tank gas filling electromagnetic valve (14) to inject compressed air into a gas tank (8), monitoring the pressure in the gas tank (8) through the gas tank pressure indicator (9) and the gas tank digital display pressure indicator (1.6), and automatically closing the gas tank gas filling electromagnetic valve (14) when the pressure reaches the preset pressure value, so that the pressurizing process is completed; The method comprises the steps of triggering test and data acquisition, namely, operating a test operation button (1.4) to trigger test, and simultaneously operating an oscilloscope (1.13) to start recording waveforms, wherein a trigger signal of the test operation button (1.4) controls a pneumatic instantaneous opening butterfly valve (6) to be instantaneously opened, high-pressure gas in a gas storage tank (8) acts on the inside of a tested pressure release valve (2) through a gas pressure output pipeline (5), and the oscilloscope (1.13) synchronously acquires and displays two waveforms, namely, a first waveform which is a pressure waveform from a high-speed pressure sensor (4) and reflects the pressure rise in the valve, and a second waveform which is a displacement signal waveform from a laser position sensor (2.2) and reflects the displacement state of the pressure release valve membrane disc (2.1); Step four, action judgment and flow termination, namely when the internal pressure of the tested pressure release valve (2) reaches the opening pressure, the pressure release valve membrane disc (2.1) is in action jump, when the displacement of the pressure release valve membrane disc (2.1) is larger than 2mm, the laser position sensor (2.2) captures the displacement, the output displacement signal waveform jumps from low level to high level, when an internal program of the equipment detects the displacement signal jump, a control signal is triggered to close the pneumatic instant opening butterfly valve (6), and an oscilloscope (1.13) is controlled to pause waveform recording; and step five, residual air pressure discharging and data reading, wherein an equipment program controls a residual air pressure discharging electromagnetic valve (16) to be opened for testing, residual air in an air pressure output pipeline (5) is discharged through preset time, an operator reads and analyzes the recorded two waveforms through an oscilloscope (1.13), and a time interval from the start of rising of a pressure waveform to the jump of a displacement signal waveform to a high level is determined, so that the response time of the tested pressure release valve (2) is obtained.

Description

Test equipment and method for response time of pressure release valve of transformer Technical Field The invention relates to the technical field of transformer assembly pressure relief valve tests, in particular to test equipment and method for response time of a transformer pressure relief valve. Background With the development trend of clean energy, more and more land wind power and offshore wind power are in the construction of fire heat, the land wind power has no higher corrosion resistance and occupation area restriction, a transformer is placed outside a wind power tower or inside the tower, but the corrosion resistance of the offshore wind power and the position where the transformer is placed have severe requirements, the corrosion resistance of the offshore wind power at least meets the C5 corrosion resistance level, the platform transformer meets the CX corrosion resistance level, the installation position of the transformer is the position where the transformer is placed in a cabin, the transformer can replace a part of the original counterweight of the cabin for the first time, and on the other hand, the integration of a wind power generation unit, a transformer boosting part and a control part can be facilitated, and various cables in the middle can be greatly reduced. The transformer is required to have smaller volume, is safer and more reliable, and once the high-temperature oil pressure in the transformer exceeds the standard, the oil pressure is not released through a pipeline of the pressure release valve in time, but leaks at a welding position of the box body, so that the risk of scrapping the whole wind power generation fire is easily caused, and the 2ms response time of the pressure release valve is required to be rigid. Therefore, there is a need for a testing apparatus and method for transformer pressure relief valve response time that addresses the above-described issues. Disclosure of Invention The invention aims to provide a testing device and a testing method for response time of a pressure release valve of a transformer, which are used for solving the problem that the prior art cannot quickly, accurately and automatically detect the opening response time of each pressure release valve, especially the critical 2ms threshold value, on a production line. In a first aspect, the present invention provides a test apparatus for transformer pressure relief valve response time, comprising: the upper half part of the control cabinet is provided with a test control touch screen which is used for embedding a control program and controlling each execution element of the equipment; The gas storage system comprises a gas storage tank, a gas storage tank gas-filling electromagnetic valve connected to the gas inlet end of the gas storage tank and a gas storage tank pressure sensor for monitoring the internal pressure of the gas storage tank, wherein the control cabinet is provided with a gas storage tank digital display pressure indicator and a gas storage tank gas-filling start button which are electrically connected with the gas storage tank gas-filling electromagnetic valve and the gas storage tank pressure sensor and are used for controlling the gas-filling process and displaying the gas storage tank pressure; The test execution and trigger unit comprises a pneumatic instantaneous butterfly valve and a test operation button, wherein the input end of the pneumatic instantaneous butterfly valve is connected with the air outlet end of the air storage tank through an air pressure output pipeline, and the output end of the pneumatic instantaneous butterfly valve is connected to the mounting interface of the tested pressure release valve; The signal detection and acquisition unit comprises a laser position sensor for detecting the displacement of the membrane disc of the pressure release valve, a high-speed pressure sensor for detecting the pressure in the air pressure output pipeline and an oscilloscope, wherein the laser position sensor is fixed through a mounting bracket, the detection focus of the laser position sensor is opposite to the membrane disc of the tested pressure release valve arranged above the test bench bracket, the output ends of the laser position sensor and the high-speed pressure sensor are electrically connected with the oscilloscope, and the oscilloscope is used for acquiring and displaying pressure waveforms and displacement signal waveforms. Further, still be equipped with on the switch board: A test run display light associated with the test run button for displaying a test run state; a test emergency stop button for emergency stopping the entire test system; the gas storage tank gas filling emergency stop button is used for emergency stop of the gas storage tank gas filling process; The gas storage tank gas filling stop button is used for manually stopping the gas storage tank gas filling process; The gas storage tank gas filling stop indicator lamp and the gas storag