Degassing device, spectrometer for detecting dissolved gases in insulating oil and control method thereof

Abstract

The invention relates to a degassing device, a spectrometer for dissolved gas in insulating oil and a control method thereof. The degassing device comprises a first linear stepping motor, a degassing cylinder, an oil filter bottle, a degassing electromagnetic valve, a magnetic induction rotary stirrer and an alternating magnetic field generator; the first linear stepping motor is below the degassing cylinder, the magnetic induction rotary stirrer is installed inside the degassing cylinder, and the alternating magnetic field generator is installed around the outside of the degassing cylinder and close to the magnetic induction rotary stirrer; the lower opening of the degassing electromagnetic valve is connected to the top cover of the degassing cylinder, and the upper opening is connected to the bottom of the oil filter bottle; the spectrometer comprises a degassing device, a gas transfer device, a spectrometer detection device and a circuit control module; the control steps of the spectrometer detection device are: oil circuit flushing, gas circuit flushing, oil feeding and vacuuming, degassing, gas transfer, and spectrometer detection; the degassing device of the invention has high efficiency and low oil consumption, and the spectrometer detection device has small size, high sensitivity, fast data response and small demand for sample gas.

Description

1. Technical field:

[0002] The invention relates to a degassing device, a dissolved gas detector and a control method thereof, and in particular to a degassing device, a spectrum detector of dissolved gas in insulating oil and a control method thereof. (II) Background technology:

[0004] As an important equipment in the power system, the detection of the transformer's status is particularly important. At present, the industry mainly judges the status of the transformer by detecting the content of dissolved gas in the transformer insulating oil. The mainstream analysis method currently used is gas chromatography. However, gas chromatography requires multiple gas sources such as high-purity carrier gas, and a chromatographic column is also required to separate the mixed gas. The structure is complex, consumables are many, and the maintenance cost is high. In recent years, a new laser photoacoustic spectroscopy method has emerged. It uses the principle of photoacoustic effect. Through the irradiation of the sample gas by laser, the specific components in the sample gas absorb energy and generate agitation during the de-excitation process. The concentration of the component is determined by the size of this agitation signal. Its advantages are that it does not require a chromatographic column and high-purity carrier gas, and can directly detect a single component in the mixed gas. It has few consumables and simple maintenance. Its disadvantages are that each characteristic gas requires a laser photoacoustic spectroscopy detector, and the detection gas volume is large, and the detection oil volume is correspondingly large. At least several hundred milliliters of oil are required for one detection. (III) Summary of the invention:

[0006] The technical problem to be solved by the present invention is to provide a degassing device, a spectrometer for dissolved gases in insulating oil and a control method thereof. The degassing device has high degassing efficiency and low oil consumption. The spectrometer for dissolved gases in insulating oil has small size, high sensitivity, fast data response and low demand for sample gas.

[0007] The technical solution of the present invention:

[0008] A degassing device comprises a first linear stepper motor, a degassing cylinder, an oil filter bottle, an oil inlet solenoid valve, an oil return solenoid valve, a degassing solenoid valve, a filter exhaust solenoid valve, a first air supply solenoid valve, a degassing auxiliary solenoid valve, a first pressure sensor, a spring, a magnetic induction rotary stirrer, an alternating magnetic field generator, three degassing limit switches, a degassing limit switch baffle and a first bracket; the first linear stepper motor and the degassing cylinder are both fixedly mounted on the first bracket, and the first linear stepper motor is below the degassing cylinder, the telescopic rod of the first linear stepper motor is vertically arranged upward, the opening of the degassing cylinder is vertically arranged downward, a first piston is installed in the degassing cylinder, the piston rod on the first piston is vertically arranged, and the upper end of the piston rod on the first piston is aligned with the first piston The lower surface is fixedly connected, and the lower end of the piston rod on the first piston is fixedly connected to the upper end of the telescopic rod of the first linear stepping motor; the degassing cylinder top cover on the upper part of the degassing cylinder is sealed and connected to the degassing cylinder, and the oil inlet solenoid valve, oil return solenoid valve, degassing solenoid valve and the first pressure sensor are all installed on the degassing cylinder top cover, and the outlet of the oil inlet solenoid valve, the inlet of the oil return solenoid valve, the lower port of the degassing solenoid valve and the detection port of the first pressure sensor are connected to the interior of the degassing cylinder through the connecting channel inside the degassing cylinder top cover; the spring and the magnetic induction rotary agitator are both installed inside the degassing cylinder, the upper end of the spring is fixedly connected to the inner surface of the degassing cylinder top cover, the lower end of the spring is fixedly connected to the upper surface of the magnetic induction rotary agitator, and the alternating magnetic field generator It is installed around the outside of the degassing cylinder and close to the magnetic induction rotating agitator; the lower opening of the degassing solenoid valve is connected to the upper surface of the degassing cylinder top cover, the upper opening of the degassing solenoid valve is connected to the bottom of the oil filter bottle, and the upper opening of the degassing solenoid valve is connected to the inside of the oil filter bottle; an oil filter membrane is arranged horizontally inside the oil filter bottle, and the gas degassing from the degassing cylinder will filter out the trace insulating oil mixed therein after passing through the oil filter membrane to ensure that pure gas is delivered, and a filter outlet is arranged on the side of the oil filter bottle, and the filter outlet is located below the oil filter membrane, and the inlet of the filter outlet solenoid valve is connected to the filter outlet; the oil filter bottle top cover on the upper part of the oil filter bottle is sealed with the oil filter bottle, the first air supply solenoid valve and the degassing auxiliary solenoid valve are both installed on the oil filter bottle top cover, and the outlet of the first air supply solenoid valve The inlet of the degassing auxiliary solenoid valve is connected to the inside of the oil filter bottle through the connecting channel inside the top cover of the oil filter bottle; the three degassing limit switches are respectively an upper degassing limit switch, a middle degassing limit switch and a lower degassing limit switch, and the three degassing limit switches are all opposing photoelectric switches. The three degassing limit switches are all installed on the first bracket, and the upper degassing limit switch, the middle degassing limit switch and the lower degassing limit switch are arranged in sequence from top to bottom; one end of the degassing limit switch baffle is fixedly connected to the telescopic rod of the first linear stepping motor, or fixedly connected to the piston rod of the first piston, or fixedly connected to the connection between the telescopic rod of the first linear stepping motor and the piston rod of the first piston, and the other end of the degassing limit switch baffle is a free end;When the telescopic rod of the first linear stepper motor is extended and retracted up and down, the degassing limit switch baffle is driven to move up and down reciprocatingly, so that the free end of the degassing limit switch baffle passes between the transmitting tubes and receiving tubes of the three degassing limit switches in sequence, thereby blocking the light emitted from the transmitting tubes of the three degassing limit switches to the receiving tube in sequence. ;

[0009] The magnetic induction rotary stirrer comprises a rotary turbine, a turbine mesh and two magnet blocks. The rotary turbine is installed in the turbine mesh, the lower end of the spring is fixedly connected to the upper surface of the turbine mesh, the rotating shaft of the rotary turbine is vertically arranged, and the upper and lower ends of the rotating shaft of the rotary turbine are respectively installed in the rotating shaft holes on the upper surface and the lower surface of the turbine mesh, and the two magnet blocks are respectively embedded in the two magnet mounting holes on the rotary turbine blades, and the two magnet mounting holes are symmetrically arranged on both sides of the rotating shaft of the rotary turbine; the alternating magnetic field generator comprises six coils and a coil shell, the coil shell is an annular tubular shell sleeved on the outer surface of the degassing cylinder, the six coils are all installed in the coil shell, and the six coils are evenly surrounded by the degassing cylinder, every two oppositely arranged coils are connected in series to form a coil group, and the six coils form three coil groups in total, and the center lines of the two oppositely arranged coils coincide with a diameter of the degassing cylinder; the three coil groups are alternately powered on to form an alternating magnetic field, and the magnet blocks on the rotary turbine move under the action of the alternating magnetic field, thereby driving the rotary turbine to rotate forward and reverse.

[0010] The rotating turbine contains four inclined blades; the turbine mesh cover contains an upper mesh cover body and a lower mesh cover body connected together, the lower mesh cover body is a flat cover body, and the lower end of the spring is fixedly connected to the upper surface periphery of the lower mesh cover body; the magnet block is made of neodymium magnet; a pull rod extending vertically downward is provided around the lower surface of the degassing cylinder top cover, and the degassing cylinder top cover is connected to the first bracket through the pull rod, so as to be pressed on the degassing cylinder, and the coil shell of the alternating magnetic field generator passes through the pull rod and is fixed around the outer side surface of the degassing cylinder.

[0011] When the free end of the degassing limit switch baffle is located between the transmitting tube and the receiving tube of the upper degassing limit switch, the spring is compressed by the first piston; when the free end of the degassing limit switch baffle is located between the transmitting tube and the receiving tube of the middle degassing limit switch, the spring is completely released.

[0012] The outlet of the oil inlet solenoid valve, the inlet of the oil return solenoid valve and the detection port of the first pressure sensor are all connected to the side of the top cover of the degassing cylinder; the first bracket is a transversely placed U-shaped bracket, the first bracket contains a first upper horizontal plate, a first lower horizontal plate and a first lateral vertical plate, the lower end of the degassing cylinder is fixed on the upper surface of the first upper horizontal plate, the piston rod of the first piston in the degassing cylinder vertically passes through the first upper horizontal plate from the upper surface of the first upper horizontal plate downward, the upper end of the first linear stepper motor is fixed on the lower surface of the first lower horizontal plate, the telescopic rod of the first linear stepper motor vertically passes through the first lower horizontal plate from the lower surface of the first lower horizontal plate upward and is connected to the piston rod of the first piston; three degassing limit switches are fixed on the first lateral vertical plate, and the upper degassing limit switch, the middle degassing limit switch and the lower degassing limit switch are evenly arranged from top to bottom.

[0013] The degassing limit switch baffle is folded into a Z shape; the degassing cylinder top cover is sealed and connected to the degassing cylinder through a first sealing ring; the outlet of the first air replenishing solenoid valve and the inlet of the degassing auxiliary solenoid valve are connected to the side of the oil filter bottle top cover.

[0014] A spectrometer for detecting dissolved gases in insulating oil containing the above-mentioned degassing device also contains a gas transfer device, a spectrum detection device, a gas carrier tank and a circuit control module; the gas transfer device contains a second linear stepper motor, a gas transfer cylinder, a venting solenoid valve, a second gas replenishing solenoid valve, a second pressure sensor, two gas transfer limit switches, a gas transfer limit switch baffle and a second bracket; the second linear stepper motor and the gas transfer cylinder are both fixedly mounted on the second bracket, and the second linear stepper motor is below the gas transfer cylinder, the telescopic rod of the second linear stepper motor is vertically arranged upward, and the opening of the gas transfer cylinder is vertically arranged downward The gas transfer cylinder is provided with a second piston, the piston rod on the second piston is vertically arranged, the upper end of the piston rod on the second piston is fixedly connected to the lower surface of the second piston, and the lower end of the piston rod on the second piston is fixedly connected to the upper end of the telescopic rod of the second linear stepping motor; the gas transfer cylinder top cover on the upper part of the gas transfer cylinder is sealed with the gas transfer cylinder, the venting solenoid valve, the second gas replenishing solenoid valve and the second pressure sensor are all installed on the gas transfer cylinder top cover, and the gas transfer cylinder top cover is also provided with an air inlet and an air outlet, the air inlet, the air outlet, the outlet of the second gas replenishing solenoid valve, the inlet of the venting solenoid valve and the second pressure sensor The detection port of the sensor is connected to the inside of the gas transfer cylinder through a connecting channel inside the top cover of the gas transfer cylinder; the two gas transfer limit switches are respectively an upper gas transfer limit switch and a lower gas transfer limit switch, and both gas transfer limit switches are opposing photoelectric switches. Both gas transfer limit switches are installed on the second bracket, and the upper gas transfer limit switch is located directly above the lower gas transfer limit switch; one end of the gas transfer limit switch baffle is fixedly connected to the telescopic rod of the second linear stepping motor, or fixedly connected to the piston rod of the second piston, or fixedly connected to the telescopic rod of the second linear stepping motor and the second At the connection point of the piston rod of the piston, the other end of the gas transfer limit switch baffle is a free end; when the telescopic rod of the second linear stepper motor is extended and retracted up and down, the gas transfer limit switch baffle is driven to move up and down reciprocatingly, so that the free end of the gas transfer limit switch baffle passes between the transmitting tube and the receiving tube of the two gas transfer limit switches in sequence, thereby sequentially blocking the light emitted from the transmitting tube of the two gas transfer limit switches to the receiving tube; the spectrum detection device contains N spectrum detection modules and N injection solenoid valves, and the outlets of the N injection solenoid valves are respectively connected to the injection ports of the N spectrum detection modules, and N is a natural number greater than or equal to 1;

[0015] The outlet of the degassing auxiliary solenoid valve in the degassing device is connected to the air inlet in the gas transfer device; the inlet of the first air replenishment solenoid valve in the degassing device and the inlet of the second air replenishment solenoid valve in the gas transfer device are both connected to the outlet of the carrier gas tank; the air outlet in the gas transfer device is connected to the inlets of N injection solenoid valves in the spectrum detection device; the circuit control module is connected to the first linear stepping motor, the oil inlet solenoid valve, the oil return solenoid valve, the degassing solenoid valve, the filter and exhaust solenoid valve, the first air replenishment solenoid valve, the degassing auxiliary solenoid valve, the first pressure sensor, the alternating magnetic field generator, three degassing limit switches, the second linear stepping motor, the venting solenoid valve, the second air replenishment solenoid valve, the second pressure sensor, two gas transfer limit switches, N spectrum detection modules and N injection solenoid valves.

[0016] The connection between the circuit control module and the alternating magnetic field generator refers to the connection with three coil groups in the alternating magnetic field generator.

[0017] The dissolved gas spectrometer in insulating oil also comprises an oil sample box, a waste oil box, a filter, an oil inlet pipe and an oil drain pipe. The outlet of the oil sample box is connected to the inlet of the oil inlet solenoid valve through the filter and the oil inlet pipe in sequence, and the outlet of the oil return solenoid valve is connected to the waste oil box through the oil drain pipe; the inlet of the first gas replenishment solenoid valve in the degassing device and the inlet of the second gas replenishment solenoid valve in the gas transfer device are connected to the outlet of the carrier gas tank through a tee; a carrier gas pressure sensor is installed on the carrier gas tank, and a flow sensor is installed on the outlet of the carrier gas tank; the spectrum detection module is a laser spectrum detection module; the value range of N is 1 to 15.

[0018] The outlet of the second air-inflation solenoid valve and the inlet of the air-draining solenoid valve are both connected to the side of the gas transfer cylinder top cover, and the detection port of the second pressure sensor is connected to the upper surface of the gas transfer cylinder top cover; the second bracket is a transversely placed U-shaped bracket, and the second bracket contains a second upper horizontal plate, a second lower horizontal plate, and a second lateral vertical plate. The lower end of the gas transfer cylinder is fixed on the upper surface of the second upper horizontal plate, and the piston rod of the second piston in the gas transfer cylinder vertically passes through the second upper horizontal plate from the upper surface of the second upper horizontal plate downward, the upper end of the second linear stepper motor is fixed on the lower surface of the second lower horizontal plate, and the telescopic rod of the second linear stepper motor vertically passes through the second lower horizontal plate from the lower surface of the second lower horizontal plate upward and is connected to the piston rod of the second piston; two gas transfer limit switches are fixed on the second lateral vertical plate.

[0019] The gas transfer limit switch baffle is folded into a Z shape; the gas transfer cylinder top cover and the gas transfer cylinder are sealed by a second sealing ring; a pull rod extending vertically downward is provided around the lower surface of the gas transfer cylinder top cover, and the gas transfer cylinder top cover is connected to the second bracket through the pull rod, thereby being pressed against the gas transfer cylinder.

[0020] A control method for the above-mentioned dissolved gas spectrometer in insulating oil, specifically: the circuit control module controls the oil inlet solenoid valve, the degassing solenoid valve, the degassing auxiliary solenoid valve, the filter and exhaust solenoid valve, the first gas supply solenoid valve, the second gas supply solenoid valve and N injection solenoid valves to be closed, and controls the oil return solenoid valve and the venting solenoid valve to be opened; then controls the first linear stepper motor to move so that the free end of the degassing limit switch baffle moves to the upper degassing limit switch, controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves to the upper gas transfer limit switch; then, the circuit control module controls the oil return solenoid valve and the venting solenoid valve to be closed; and then performs the following operations:

[0021] Step 1: Perform M oil line flushing, where M is a natural number greater than or equal to 1;

[0022] The process of each oil circuit flushing is as follows: first, the circuit control module controls the oil inlet solenoid valve to open; second, the circuit control module controls the movement of the first linear stepper motor to move the free end of the degassing limit switch baffle from the upper degassing limit switch downward to the lower degassing limit switch, at which time negative pressure is generated in the degassing cylinder, and the insulating oil in the oil sample box will be sucked into the degassing cylinder by the negative pressure; third, the circuit control module determines whether the degassing cylinder is full of insulating oil by detecting the signal of the first pressure sensor. If the degassing cylinder is full of insulating oil, the circuit control module Control the oil inlet solenoid valve to close and the oil return solenoid valve to open; Fourth, the circuit control module controls the movement of the first linear stepper motor to move the free end of the degassing limit switch baffle from the lower degassing limit switch upward to the upper degassing limit switch, at which time a positive pressure is generated in the degassing cylinder, and the insulating oil in the degassing cylinder will enter the waste oil tank through the oil drain pipe; Fifth, the circuit control module determines whether the insulating oil in the degassing cylinder has been drained by detecting the signal of the first pressure sensor. If the insulating oil in the degassing cylinder has been drained, the circuit control module controls the oil return solenoid valve to close;

[0023] Step 2: First, perform gas circuit flushing, and then, the circuit control module reads the monitoring results of N spectrum detection modules; when the gas component content monitored by all spectrum detection modules is 0, the gas circuit flushing is completed and the process goes to step 3; otherwise, the process goes back to step 2;

[0024] The process of gas line flushing is as follows: first, the circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to open; second, the circuit control module controls the movement of the second linear stepper motor to move the free end of the gas transfer limit switch baffle from the upper gas transfer limit switch downward to the lower gas transfer limit switch. At this time, negative pressure is formed in the gas transfer cylinder, and the gas in the oil filter bottle and N spectrum detection modules is sucked into the gas transfer cylinder; third, after a delay period, the circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to close, and then controls the release The empty solenoid valve is opened; fourth, the circuit control module controls the movement of the second linear stepper motor to move the free end of the gas transfer limit switch baffle from the lower gas transfer limit switch upward to the upper gas transfer limit switch; fifth, the circuit control module controls the venting solenoid valve to close, and controls the first gas replenishment solenoid valve, the second gas replenishment solenoid valve and N injection solenoid valves to open. At this time, the carrier gas in the carrier gas tank enters the oil filter bottle and the N spectrum detection modules; sixth, the circuit control module controls the first gas replenishment solenoid valve, the second gas replenishment solenoid valve and the N injection solenoid valves to close;

[0025] Step 3, pre-degassing treatment: oil filling and vacuuming;

[0026] The oil inlet process is as follows: first, the circuit control module controls the oil inlet solenoid valve to open; second, the circuit control module controls the movement of the first linear stepper motor to move the free end of the degassing limit switch baffle downward from the upper degassing limit switch to the middle degassing limit switch, at which time negative pressure is generated in the degassing cylinder, and the insulating oil in the oil sample box is sucked into the degassing cylinder by the negative pressure; third, after a delay period, the circuit control module determines whether the degassing cylinder is full of insulating oil by detecting the signal of the first pressure sensor. If the degassing cylinder is full of insulating oil, the circuit control module controls the oil inlet solenoid valve to close, and at this time a fixed volume of insulating oil can be retained in the degassing cylinder;

[0027] The vacuuming process is as follows: 1. The circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to open; 2. The circuit control module controls the movement of the second linear stepper motor to move the free end of the gas transfer limit switch baffle from the upper gas transfer limit switch downward to the lower gas transfer limit switch, at which time a negative pressure is formed in the gas transfer cylinder, and the gas in the oil filter bottle and the N spectrum detection modules is drawn into the gas transfer cylinder; 3. After a delay of a period of time, the circuit control module controls the degassing auxiliary solenoid valve and the N injection solenoid valves to close, and controls the venting solenoid valve to open; 4. The circuit control module controls the movement of the second linear stepper motor to move the free end of the gas transfer limit switch baffle from the lower gas transfer limit switch upward to the upper gas transfer limit switch; 5. The circuit control module controls the venting solenoid valve to close, at which time the vacuuming operation of the oil filter bottle and the N spectrum detection modules is completed;

[0028] Step 4, first perform degassing, then the circuit control module calculates the amount of gas released according to the detection signal of the first pressure sensor and the volume of the oil filter bottle; if the amount of gas released is less than a predetermined value, execute to step 4 after re-filling the oil; if the amount of gas released is greater than or equal to the predetermined value, execute to step 5;

[0029] The degassing process is as follows: first, the circuit control module controls the degassing solenoid valve to open, at which time the degassing cylinder and the oil filter bottle are connected, and also controls the alternating magnetic field generator to be powered on; second, the circuit control module controls the movement of the first linear stepper motor, first making the free end of the degassing limit switch baffle do P reciprocating motions between the middle degassing limit switch and the lower degassing limit switch, P being a natural number greater than or equal to 1, and then making the free end of the degassing limit switch baffle stay at the middle degassing limit switch, at which time negative pressure is generated in the degassing cylinder, forming degassing of the insulating oil, and the insulating oil moves up and down in the degassing cylinder, repeatedly passing through the magnetic induction rotating agitator, which promotes the insulation. The dissolved gas in the oil is removed and collected in the oil filter bottle, gradually reaching an oil-gas balance state; third, the circuit control module controls the degassing solenoid valve to close, degassing is completed, and a certain volume of removed gas is accumulated in the oil filter bottle; fourth, the circuit control module controls the oil return solenoid valve to open; fifth, the circuit control module controls the first linear stepper motor to move, so that the free end of the degassing limit switch baffle moves upward from the middle degassing limit switch to the upper degassing limit switch, and the insulating oil in the degassing cylinder is pressed back into the waste oil tank, and the oil return is completed; sixth, the circuit control module controls the oil return solenoid valve to close; seventh, the circuit control module controls the alternating magnetic field generator to power off;

[0030] Step 5, perform gas transfer processing: First, the circuit control module controls the degassing auxiliary solenoid valve to open, at which time the gas transfer cylinder and the oil filter bottle are connected; second, the circuit control module controls the second linear stepper motor to move, so that the free end of the gas transfer limit switch baffle moves downward from the upper gas transfer limit switch to the lower gas transfer limit switch, at which time, a negative pressure is generated in the gas transfer cylinder, and the gas in the oil filter bottle is drawn into the gas transfer cylinder; third, the circuit control module controls the degassing auxiliary solenoid valve to close; fourth, the circuit control module controls the second linear stepper motor to move, so that the free end of the gas transfer limit switch baffle moves upward from the lower gas transfer limit switch, and at the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor, and when the pressure value in the gas transfer cylinder is the normal pressure value, the second linear stepper motor is controlled to stop moving; fifth, the circuit control module calculates the amount of gas in the gas transfer cylinder according to the number of running steps of the second linear stepper motor and the volume of the gas transfer cylinder, and the transfer of the sample gas is completed at this time;

[0031] Step 6. Send the gas in the gas transfer cylinder to the spectrum detection module for detection and analysis:

[0032] If the amount of gas in the gas transfer cylinder calculated in step 5 is greater than or equal to the amount required by the N spectral detection modules, it indicates that the escaped gas can meet the conditions for simultaneous sampling. At this time, the circuit control module controls the N sampling solenoid valves to open, and then controls the second linear stepper motor to move, so that the free end of the gas transfer limit switch baffle moves upward, and the sample gas in the gas transfer cylinder is pushed into the N spectral detection modules. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor. When the pressure value in the gas transfer cylinder is the normal pressure value, the second linear stepper motor is controlled to stop moving, and then the N spectral detection modules are controlled to perform detection and analysis. After the detection and analysis are completed, the second linear stepper motor is controlled to move, so that the free end of the gas transfer limit switch baffle moves downward to the lower gas transfer limit switch, and the sample gas is extracted from the N spectral detection modules. Finally, the N sampling solenoid valves are controlled to close;

[0033] If the amount of gas in the gas transfer cylinder calculated in step 5 is less than the amount required by the N spectral detection modules, the circuit control module will send the gas in the gas transfer cylinder to the N spectral detection modules in batches for detection and analysis according to the amount of gas in the gas transfer cylinder. The spectral detection module selected each time is different. In this process, the circuit control module will intelligently select and judge, and will give priority to the detection of the components of key concern.

[0034] The process of the circuit control module sending the gas in the gas transfer cylinder to the spectrum detection module for detection and analysis each time is as follows: first, controlling the injection solenoid valve connected to the selected spectrum detection module to open; second, controlling the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves upward, and pushes the sample gas into the spectrum detection module of some specified components. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor. When the pressure value in the gas transfer cylinder is the normal pressure value, the second linear stepper motor is controlled to stop moving; third, controlling the selected spectrum detection module to perform detection and analysis; fourth, controlling the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves downward to the lower gas transfer limit switch, and the sample gas is extracted from the specified spectrum detection module; fifth, controlling the injection solenoid valve connected to the selected spectrum detection module to close;

[0035] After the sample gas is pushed into the spectrum detection module, the laser source on the spectrum detection module irradiates it with a laser of a specific wavelength. The components to be tested in the sample gas are agitated under the action of the laser to form sound waves. This signal is sensed and recorded by the spectrum module. The concentration of the sample gas can be obtained by the signal size, and the concentration of the oil sample can be inferred by the concentration of the sample gas.

[0036] Step 7, perform filter exhaust purge: First, the circuit control module controls the filter exhaust solenoid valve and the first air supply solenoid valve to open, at which time the carrier gas in the carrier gas tank flows into the oil filter bottle, and the insulating oil residue in the oil filter bottle is discharged from the filter exhaust solenoid valve; Second, the circuit control module controls the filter exhaust solenoid valve and the first air supply solenoid valve to close, completing the filter exhaust purge action;

[0037] Venting: The circuit control module controls the venting solenoid valve to open, and then controls the second linear stepper motor to move, so that the free end of the gas transfer limit switch baffle moves upward to the upper gas transfer limit switch, discharges the sample gas in the gas transfer cylinder, and finally controls the venting solenoid valve to close;

[0038] After completing the analysis of the sample gas, the circuit control module calculates the concentration of dissolved gas in the insulating oil based on parameters such as oil sample volume, sample gas volume, sample gas concentration, and degassing rate, and gives the final result.

[0039] The value range of M is 3 to 10; the value range of P is 5 to 30.

[0040] Beneficial effects of the present invention:

[0041] 1. The degassing device of the present invention contains a magnetic induction rotary stirrer. The blades of the rotary turbine in the magnetic induction rotary stirrer are inclined blades. The rotary turbine can rotate forward and backward under the stimulation of the alternating magnetic field generator, and stirs the insulating oil while degassing the insulating oil, repeatedly forming a vortex in the insulating oil and breaking it up, thereby increasing the degassing speed (the degassing time only takes about 5 minutes), greatly improving the degassing efficiency, and reducing the oil consumption. The present invention only needs a few dozen ML of oil sample at most for degassing each time, which is a qualitative improvement compared to the existing similar products with an oil consumption of 1 to 2L.

[0042] 2. The degassing device of the present invention contains an oil filter bottle, and an oil filter membrane is arranged horizontally inside the oil filter bottle to filter the degassed sample gas to ensure that the pure sample gas enters the subsequent equipment, thereby avoiding contamination caused by the oil sample and reducing the detection error.

[0043] 3. The dissolved gas spectrometer in insulating oil of the present invention comprises a gas transfer device and a spectrum detection device. The spectrum detection device comprises N spectrum detection modules arranged in parallel. The gas transfer device can send the sample gas into the designated spectrum detection module for detection. After the detection, the sample gas is extracted and sent to other spectrum detection modules for detection, thereby realizing the repeated use of the sample gas and reducing the demand for the sample gas. The dissolved gas spectrometer of the present invention uses less than 10 ml of gas for detection (at least 1 ml of sample gas is required), and only tens of ml of oil are required. The existing spectrum detection equipment arranges the spectrum detection modules in series, and the detection gas consumption requires more than ten ml. Together with the flushing gas before and after the analysis, the total gas consumption can reach 100 ml. In order to ensure sufficient degassing volume, at least several hundred ml of sample oil are required.

[0044] 4. The N spectrum detection modules in the spectrum detection device of the spectrum detection instrument for dissolved gas in insulating oil of the present invention have their own independent injection solenoid valves, and each spectrum detection module only tests one component, and is matched with a laser light source with a fixed wavelength, which fundamentally avoids the cross-interference caused by light sources with different wavelengths. Moreover, multiple spectrum detection modules detect simultaneously, and the data response is fast. The detector can intelligently select and open the corresponding spectrum detection module according to the size of the sample gas volume, the sensitivity of the detection component, the length of the component response time, etc., thereby realizing rapid analysis and focused analysis.

[0045] 5. The spectrometer for detecting dissolved gases in insulating oil of the present invention is different from the existing chromatographic gas detection equipment.

[0046] Compared with the conventional method, no external generator, oscillator or other equipment is required. Therefore, the spectrum detector integrated process of the present invention is

[0047] High degree and small size.

[0048] 6. The control method of the spectrometer for dissolved gases in insulating oil of the present invention includes a processing step before degassing. Before degassing, the oil filter bottle and the spectral detection module are first evacuated to keep them in a negative pressure state. This not only improves the degassing efficiency again and realizes full-process negative pressure degassing, but also helps the sample gas to enter the spectral detection module better without being diluted by the original gas in the spectral detection module, thereby improving the sensitivity of the spectrometer. Among them, for C2H2, the minimum detectable oil is 0.02ppm (20ppb), which can realize ultra-trace ppb level analysis of dissolved gases in transformer insulating oil. (IV) Description of the accompanying drawings:

[0050] Figure 1 It is a schematic diagram of the structure of the oil circuit and gas circuit of the spectrometer for dissolved gas in insulating oil;

[0051] Figure 2 is a schematic diagram of the structure of the degassing device;

[0052] Figure 3 for Figure 2 Schematic diagram of the structure viewed from above;

[0053] Figure 4 for Figure 2 AA section view enlarged structural diagram;

[0054] Figure 5 for Figure 3 BB cross-sectional structure diagram in FIG.

[0055] Figure 6 It is a schematic diagram of the three-dimensional structure of the degassing device;

[0056] Figure 7 for Figure 5 A schematic diagram of the enlarged structure of the medium magnetic induction rotary stirrer;

[0057] Figure 8 for Figure 7 A schematic diagram of a top view structure;

[0058] Fig. 9 for Figure 8 Schematic diagram of CC cross-sectional structure;

[0059] Fig.10 for Fig. 9 Schematic diagram of the structure when the components are separated;

[0060] Fig.11 for Figure 7 Schematic diagram of the three-dimensional structure of the medium magnetic induction rotary stirrer;

[0061] Fig.12 for Fig.11 Schematic diagram of the three-dimensional structure of the mid-rotating turbine;

[0062] Fig.13 is a schematic diagram of the structure of the gas transfer device;

[0063] Fig.14 for Fig.13 A schematic diagram of a top view structure;

[0064] Fig.15 for Fig.14 DD cross-sectional structure diagram in;

[0065] Fig.16 is a schematic diagram of the three-dimensional structure of the gas transfer device;

[0066] Fig.17 It is a schematic diagram of the overall reduced structure of the spectrometer for dissolved gases in insulating oil. (V) Specific embodiments:

[0068] See also Figure 1 to Figure 17In the figure, the degassing device 61 includes a first linear stepper motor 4, a degassing cylinder 5, an oil filter bottle 9, an oil inlet solenoid valve 6, an oil return solenoid valve 14, a degassing solenoid valve 8, a filter exhaust solenoid valve 16, a first air supply solenoid valve 21, a degassing auxiliary solenoid valve 22, a first pressure sensor 15, a spring 34, a magnetic induction rotary stirrer 7, an alternating magnetic field generator, three degassing limit switches, a degassing limit switch baffle 43 and a first bracket 50; the first linear stepper motor 4 and the degassing cylinder 5 are both fixedly mounted on the first bracket 50, and the first linear stepper motor 4 is below the degassing cylinder 5, the telescopic rod 45 of the first linear stepper motor 4 is vertically arranged upward, the degassing cylinder 5 is vertically arranged with its opening facing downward, and a first piston 42 is installed in the degassing cylinder 5, and the first piston 4 2, the piston rod 3 on the first piston 42 is vertically arranged, the upper end of the piston rod 3 on the first piston 42 is fixedly connected to the lower surface of the first piston 42, and the lower end of the piston rod 3 on the first piston 42 is fixedly connected to the upper end of the telescopic rod 45 of the first linear stepping motor 4; the degassing cylinder top cover 46 on the upper part of the degassing cylinder 5 is sealed with the degassing cylinder 5, the oil inlet solenoid valve 6, the oil return solenoid valve 14, the degassing solenoid valve 8 and the first pressure sensor 15 are all installed on the degassing cylinder top cover 46, and the outlet of the oil inlet solenoid valve 6, the inlet of the oil return solenoid valve 14, the lower port of the degassing solenoid valve 8 and the detection port of the first pressure sensor 15 are connected with the interior of the degassing cylinder 5 through the connecting channel 41 inside the degassing cylinder top cover 46; the spring 34 and the magnetic induction rotary stirrer 7 are installed in the degassing cylinder Inside the cylinder 5, the upper end of the spring 34 is fixedly connected to the inner surface of the degassing cylinder top cover 46, the lower end of the spring 34 is fixedly connected to the upper surface of the magnetic induction rotary stirrer 7, and the alternating magnetic field generator is installed around the outside of the degassing cylinder 5 and close to the magnetic induction rotary stirrer 7; the lower opening of the degassing solenoid valve 8 is connected to the upper surface of the degassing cylinder top cover 46, the upper opening of the degassing solenoid valve 8 is connected to the bottom of the oil filter bottle 9, and the upper opening of the degassing solenoid valve 8 is connected to the inside of the oil filter bottle 9; an oil filter membrane 10 is horizontally arranged inside the oil filter bottle 9, and the gas degassing from the degassing cylinder 5 will filter out the trace insulating oil mixed therein after passing through the oil filter membrane 10, so as to ensure that pure gas is delivered, and a filter outlet is arranged on the side of the oil filter bottle 9, and the filter outlet is located below the oil filter membrane 10, and the filter The inlet of the exhaust solenoid valve 16 is connected to the filter outlet; the oil filter bottle top cover 47 on the upper part of the oil filter bottle 9 is sealed and connected to the oil filter bottle 9, the first air supply solenoid valve 21 and the degassing auxiliary solenoid valve 22 are both installed on the oil filter bottle top cover 47, and the outlet of the first air supply solenoid valve 21 and the inlet of the degassing auxiliary solenoid valve 22 are connected to the inside of the oil filter bottle 9 through the connecting channel 48 inside the oil filter bottle top cover 47; the three degassing limit switches are respectively an upper degassing limit switch 13, a middle degassing limit switch 12 and a lower degassing limit switch 11, and the three degassing limit switches are all beam-type photoelectric switches, and the three degassing limit switches are all installed on the first bracket 50, and the upper degassing limit switch 13, the middle degassing limit switch 12 and the lower degassing limit switch 11 are arranged in sequence from top to bottom;One end of the degassing limit switch baffle 43 is fixedly connected to the telescopic rod 45 of the first linear stepping motor 4, or fixedly connected to the piston rod 3 of the first piston 42, or fixedly connected to the connection 44 of the telescopic rod 45 of the first linear stepping motor 4 and the piston rod 3 of the first piston 42, and the other end of the degassing limit switch baffle 43 is a free end; when the telescopic rod 45 of the first linear stepping motor 4 is extended and retracted up and down, the degassing limit switch baffle 43 is driven to reciprocate up and down, so that the free end of the degassing limit switch baffle 43 passes between the transmitting tubes and receiving tubes of the three degassing limit switches in sequence, thereby sequentially blocking the light emitted from the transmitting tubes of the three degassing limit switches to the receiving tube. ;

[0069] The magnetic induction rotary stirrer 7 comprises a rotary turbine 7-3, a turbine mesh cover and two magnet blocks 7-4. The rotary turbine 7-3 is installed in the turbine mesh cover. The lower end of the spring 34 is fixedly connected to the upper surface of the turbine mesh cover. The rotating shaft of the rotary turbine 7-3 is vertically arranged, and the upper and lower ends of the rotating shaft of the rotary turbine 7-3 are respectively installed in the rotating shaft holes on the upper and lower surfaces of the turbine mesh cover. The two magnet blocks 7-4 are respectively embedded in the two magnet mounting holes 7-5 on the blades of the rotary turbine 7-3. The two magnet mounting holes 7-5 are symmetrically arranged on both sides of the rotating shaft of the rotary turbine 7-3. The alternating magnetic field generator comprises six The coil 38 and a coil shell 39 are an annular tubular shell mounted on the outer side of the degassing cylinder 5. The six coils 38 are installed in the coil shell 39, and the six coils 38 are evenly surrounded by the degassing cylinder 5. Every two oppositely arranged coils 38 are connected in series to form a coil group. The six coils 38 form three coil groups in total. The center lines of the two oppositely arranged coils 38 coincide with a diameter of the degassing cylinder 5. The three coil groups are alternately powered on to form an alternating magnetic field. The magnet block 7-4 on the rotating turbine 7-3 moves under the action of the alternating magnetic field, thereby driving the rotating turbine 7-3 to rotate forward and reverse.

[0070] The rotating turbine 7-3 contains four inclined blades; the turbine mesh cover contains an upper mesh cover body 7-1 and a lower mesh cover body 7-2 connected together, the lower mesh cover body 7-2 is a flat cover body, and the lower end of the spring 34 is fixedly connected to the upper surface periphery of the lower mesh cover body 7-2; the material of the magnet block 7-4 is a neodymium magnet; the lower surface periphery of the degassing cylinder top cover 46 is provided with a pull rod 40 extending vertically downward, the degassing cylinder top cover 46 is connected to the first bracket 50 through the pull rod 40, so as to be pressed on the degassing cylinder 5, and the coil shell 39 of the alternating magnetic field generator passes through the pull rod 40 and is fixed around the outer side surface of the degassing cylinder 5.

[0071] When the free end of the degassing limit switch baffle 43 is located between the transmitting tube and the receiving tube of the upper degassing limit switch 13, the spring 34 is compressed by the first piston 42; when the free end of the degassing limit switch baffle 43 is located between the transmitting tube and the receiving tube of the middle degassing limit switch 12, the spring 34 is completely released.

[0072] The outlet of the oil inlet solenoid valve 6, the inlet of the oil return solenoid valve 14 and the detection port of the first pressure sensor 15 are all connected to the side of the degassing cylinder top cover 46; the first bracket 50 is a U-shaped bracket placed horizontally, and the first bracket 50 includes a first upper horizontal plate, a first lower horizontal plate and a first lateral vertical plate. The lower end of the degassing cylinder 5 is fixed on the upper surface of the first upper horizontal plate, and the piston rod 3 of the first piston 42 in the degassing cylinder 5 vertically passes through the first upper horizontal plate from the upper surface of the first upper horizontal plate downward, the upper end of the first linear stepper motor 4 is fixed on the lower surface of the first lower horizontal plate, and the telescopic rod 45 of the first linear stepper motor 4 vertically passes through the first lower horizontal plate from the lower surface of the first lower horizontal plate upward and is connected to the piston rod 3 of the first piston 42; three degassing limit switches are fixed on the first lateral vertical plate, and the upper degassing limit switch 13, the middle degassing limit switch 12 and the lower degassing limit switch 11 are evenly arranged in sequence from top to bottom.

[0073] The degassing limit switch baffle 43 is folded into a Z shape; the degassing cylinder top cover 46 is sealed to the degassing cylinder 5 through a first sealing ring 49; the outlet of the first air replenishment solenoid valve 21 and the inlet of the degassing auxiliary solenoid valve 22 are connected to the side of the oil filter bottle top cover 47.

[0074] The spectrometer for dissolved gas in insulating oil containing the above-mentioned degassing device 61 also contains a gas transfer device 62, a spectrum detection device 30, a carrier gas tank 17 and a circuit control module; the degassing device 61, the gas transfer device 62, the spectrum detection device 30 and the circuit control module are all installed in a chassis 70, and the touch display screen 71, the status indicator light 72 and the power switch 73 in the circuit control module are fixed on the front panel of the chassis 70; the gas transfer device 62 contains a second linear stepper motor 26, a gas transfer cylinder 24, a vent solenoid valve 23, a second gas replenishment solenoid valve 20, a second pressure sensor 29, two gas transfer limit switches, a gas transfer limit switch baffle 52 and a second bracket 51; the second linear stepper motor 26 and the gas transfer cylinder 24 are fixedly mounted on the second bracket 51, and the second linear stepper motor 26 is below the gas transfer cylinder 24, the telescopic rod 60 of the second linear stepper motor 26 is vertically arranged upward, the gas transfer cylinder 24 is vertically arranged with its opening facing downward, a second piston 63 is installed in the gas transfer cylinder 24, the piston rod 25 on the second piston 63 is vertically arranged, the upper end of the piston rod 25 on the second piston 63 is fixedly connected to the lower surface of the second piston 63, and the lower end of the piston rod 25 on the second piston 63 is fixedly connected to the upper end of the telescopic rod 60 of the second linear stepper motor 26; the gas transfer cylinder top cover 55 on the upper part of the gas transfer cylinder 24 is sealed and connected to the gas transfer cylinder 24, the venting solenoid valve 23 and the second gas replenishing valve 24 are connected to the second gas transfer cylinder 24, and the gas transfer cylinder 24 is sealed and connected to the second gas transfer cylinder 24. The solenoid valve 20 and the second pressure sensor 29 are both installed on the gas transfer cylinder top cover 55. The gas transfer cylinder top cover 55 is also provided with an air inlet 58 and an air outlet 59. The air inlet 58, the air outlet 59, the outlet of the second gas replenishment solenoid valve 20, the inlet of the venting solenoid valve 23 and the detection port of the second pressure sensor 29 are connected with the inside of the gas transfer cylinder 24 through the connecting channel 57 inside the gas transfer cylinder top cover 55; the two gas transfer limit switches are respectively the upper gas transfer limit switch 28 and the lower gas transfer limit switch 27. Both gas transfer limit switches are opposing photoelectric switches. Both gas transfer limit switches are installed on the second bracket 51, and the upper gas transfer limit switch 28 is located at the lower gas transfer limit switch 27. ; one end of the gas transfer limit switch baffle 52 is fixedly connected to the telescopic rod 60 of the second linear stepping motor 26, or fixedly connected to the piston rod 25 of the second piston 63, or fixedly connected to the connection 53 of the telescopic rod 60 of the second linear stepping motor 26 and the piston rod 25 of the second piston 63, and the other end of the gas transfer limit switch baffle 52 is a free end; when the telescopic rod 60 of the second linear stepping motor 26 is extended and retracted up and down, the gas transfer limit switch baffle 52 is driven to reciprocate up and down, so that the free end of the gas transfer limit switch baffle 52 passes between the transmitting tubes and the receiving tubes of the two gas transfer limit switches in turn, thereby blocking the light emitted from the transmitting tubes of the two gas transfer limit switches to the receiving tube in turn;The spectrum detection device 30 includes 7 spectrum detection modules 32 and 7 injection solenoid valves 31, and the outlets of the 7 injection solenoid valves 31 are connected to the injection ports of the 7 spectrum detection modules 32;

[0075] The outlet of the degassing auxiliary solenoid valve 22 in the degassing device 61 is connected to the air inlet 58 in the gas transfer device 62; the inlet of the first air replenishment solenoid valve 21 in the degassing device 61 and the inlet of the second air replenishment solenoid valve 20 in the gas transfer device 62 are both connected to the outlet of the carrier gas tank 17; the air outlet 59 in the gas transfer device 62 is connected to the inlets of the 7 injection solenoid valves 31 in the spectrum detection device 30; the circuit control module is connected to the first linear stepping motor 4, the oil inlet solenoid valve 6, the oil return solenoid valve 14, the degassing solenoid valve 8, the filter and exhaust solenoid valve 16, the first air replenishment solenoid valve 21, the degassing auxiliary solenoid valve 22, the first pressure sensor 15, the alternating magnetic field generator, three degassing limit switches, the second linear stepping motor 26, the venting solenoid valve 23, the second air replenishment solenoid valve 20, the second pressure sensor 29, two gas transfer limit switches, 7 spectrum detection modules 32 and 7 injection solenoid valves 31.

[0076] The connection between the circuit control module and the alternating magnetic field generator refers to the connection with three coil groups in the alternating magnetic field generator.

[0077] The spectrometer for dissolved gases in insulating oil also comprises an oil sample box 1, a waste oil tank 37, a filter 2, an oil inlet pipe 35 and an oil drain pipe 36. The outlet of the oil sample box 1 is connected to the inlet of the oil inlet solenoid valve 6 through the filter 2 and the oil inlet pipe 35 in sequence, and the outlet of the oil return solenoid valve 14 is connected to the waste oil tank 37 through the oil drain pipe 36; the inlet of the first gas replenishment solenoid valve 21 in the degassing device 61 and the inlet of the second gas replenishment solenoid valve 20 in the gas transfer device 62 are connected to the outlet of the carrier gas tank 17 through a tee; a carrier gas pressure sensor 18 is installed on the carrier gas tank 17, and a flow sensor 19 is installed on the outlet of the carrier gas tank 17; the spectrum detection module 32 is a laser spectrum detection module.

[0078] The outlet of the second air replenishment solenoid valve 20 and the inlet of the exhaust solenoid valve 23 are both connected to the side of the gas transfer cylinder top cover 55, and the detection port of the second pressure sensor 29 is connected to the upper surface of the gas transfer cylinder top cover 55; the second bracket 51 is a transversely placed U-shaped bracket, and the second bracket 51 contains a second upper horizontal plate, a second lower horizontal plate and a second lateral vertical plate. The lower end of the gas transfer cylinder 24 is fixed on the upper surface of the second upper horizontal plate, and the piston rod 25 of the second piston 63 in the gas transfer cylinder 24 vertically passes through the second upper horizontal plate from the upper surface of the second upper horizontal plate downward, the upper end of the second linear stepper motor 26 is fixed on the lower surface of the second lower horizontal plate, and the telescopic rod 60 of the second linear stepper motor 26 vertically passes through the second lower horizontal plate from the lower surface of the second lower horizontal plate upward and is connected to the piston rod 25 of the second piston 63; two gas transfer limit switches are fixed on the second lateral vertical plate.

[0079] The gas transfer limit switch baffle 52 is folded into a Z shape; the gas transfer cylinder top cover 55 and the gas transfer cylinder 24 are sealed by a second sealing ring 56; a pull rod 54 extending vertically downward is provided around the lower surface of the gas transfer cylinder top cover 55, and the gas transfer cylinder top cover 55 is connected to the second bracket 51 through the pull rod 54, thereby being pressed against the gas transfer cylinder 24.

[0080] The control method of the above-mentioned dissolved gas spectrometer in insulating oil is specifically as follows: the circuit control module controls the oil inlet solenoid valve 6, the degassing solenoid valve 8, the degassing auxiliary solenoid valve 22, the filter and exhaust solenoid valve 16, the first gas supply solenoid valve 21, the second gas supply solenoid valve 20 and the seven injection solenoid valves 31 to be closed, and controls the oil return solenoid valve 14 and the vent solenoid valve 23 to be opened; then controls the first linear stepper motor 4 to move so that the free end of the degassing limit switch baffle 43 moves to the upper degassing limit switch 13, controls the second linear stepper motor 26 to move so that the free end of the gas transfer limit switch baffle 52 moves to the upper gas transfer limit switch 28; then, the circuit control module controls the oil return solenoid valve 14 and the vent solenoid valve 23 to be closed; then performs the following operations:

[0081] Step 1: Flush the oil circuit 5 times;

[0082] The process of each oil circuit flushing is as follows: first, the circuit control module controls the oil inlet solenoid valve 6 to open; second, the circuit control module controls the first linear stepper motor 4 to move so that the free end of the degassing limit switch baffle 43 moves downward from the upper degassing limit switch 13 to the lower degassing limit switch 11, at which time a negative pressure is generated in the degassing cylinder 5, and the insulating oil in the oil sample box 1 will be sucked into the degassing cylinder 5 by the negative pressure; third, the circuit control module determines whether the degassing cylinder 5 is full of insulating oil by detecting the signal of the first pressure sensor 15. If the degassing cylinder 5 is full of insulating oil, the circuit control module controls the inlet solenoid valve 6 to open. The oil solenoid valve 6 is closed and the oil return solenoid valve 14 is opened; fourth, the circuit control module controls the first linear stepping motor 4 to move so that the free end of the degassing limit switch baffle 43 moves upward from the lower degassing limit switch 11 to the upper degassing limit switch 13, at which time a positive pressure is generated in the degassing cylinder 5, and the insulating oil in the degassing cylinder 5 will enter the waste oil tank 37 through the oil drain pipe 36; fifth, the circuit control module determines whether the insulating oil in the degassing cylinder 5 has been drained by detecting the signal of the first pressure sensor 15. If the insulating oil in the degassing cylinder 5 has been drained, the circuit control module controls the oil return solenoid valve 14 to close;

[0083] Step 2: First, perform gas circuit flushing, and then, the circuit control module reads the monitoring results of the seven spectrum detection modules 32; when the gas component contents monitored by all the spectrum detection modules 32 are 0, the gas circuit flushing is completed and the process goes to step 3; otherwise, the process goes back to step 2;

[0084] The process of gas line flushing is as follows: first, the circuit control module controls the degassing auxiliary solenoid valve 22 and the 7 injection solenoid valves 31 to open; second, the circuit control module controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves downward from the upper gas transfer limit switch 28 to the lower gas transfer limit switch 27, at which time a negative pressure is formed in the gas transfer cylinder 24, and the gas in the oil filter bottle 9 and the 7 spectrum detection modules 32 are sucked into the gas transfer cylinder 24; third, after a delay period, the circuit control module controls the degassing auxiliary solenoid valve 22 and the 7 injection solenoid valves 31 to close, and then controls the venting solenoid valve 26 to close. The valve 23 is opened; fourth, the circuit control module controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves upward from the lower gas transfer limit switch 27 to the upper gas transfer limit switch 28; fifth, the circuit control module controls the venting solenoid valve 23 to be closed, and controls the first gas replenishment solenoid valve 21, the second gas replenishment solenoid valve 20 and the seven injection solenoid valves 31 to be opened. At this time, the carrier gas in the carrier tank 17 enters the oil filter bottle 9 and the seven spectrum detection modules 32; sixth, the circuit control module controls the first gas replenishment solenoid valve 21, the second gas replenishment solenoid valve 20 and the seven injection solenoid valves 31 to be closed;

[0085] Step 3, pre-degassing treatment: oil filling and vacuuming;

[0086] The oil inlet process is as follows: first, the circuit control module controls the oil inlet solenoid valve 6 to open; second, the circuit control module controls the first linear stepper motor 4 to move so that the free end of the degassing limit switch baffle 43 moves downward from the upper degassing limit switch 13 to the middle degassing limit switch 12, at which time a negative pressure is generated in the degassing cylinder 5, and the insulating oil in the oil sample box 1 is sucked into the degassing cylinder 5 by the negative pressure; third, after a delay period, the circuit control module determines whether the degassing cylinder 5 is full of insulating oil by detecting the signal of the first pressure sensor 15. If the degassing cylinder 5 is full of insulating oil, the circuit control module controls the oil inlet solenoid valve 6 to close, and at this time a fixed volume of insulating oil can be retained in the degassing cylinder 5;

[0087] The vacuuming process is as follows: first, the circuit control module controls the degassing auxiliary solenoid valve 22 and the seven injection solenoid valves 31 to open; second, the circuit control module controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves downward from the upper gas transfer limit switch 28 to the lower gas transfer limit switch 27, at which time a negative pressure is formed in the gas transfer cylinder 24, and the gas in the oil filter bottle 9 and the seven spectrum detection modules 32 is drawn into the gas transfer cylinder 24; third, after a delay period, the circuit control module controls the degassing auxiliary solenoid valve 22 and the seven injection solenoid valves 31 to close, and controls the venting solenoid valve 23 to open; fourth, the circuit control module controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves upward from the lower gas transfer limit switch 27 to the upper gas transfer limit switch 28; fifth, the circuit control module controls the venting solenoid valve 23 to close, and at this time the vacuuming operation of the oil filter bottle 9 and the seven spectrum detection modules 32 is completed;

[0088] Step 4, first perform degassing, then the circuit control module calculates the amount of gas released according to the detection signal of the first pressure sensor 15 and the volume of the oil filter bottle 9; if the amount of gas released is less than a predetermined value, re-inject oil (i.e., the oil injection in step 3) and then execute to step 4; if the amount of gas released is greater than or equal to the predetermined value, execute to step 5;

[0089] The degassing process is as follows: first, the circuit control module controls the degassing solenoid valve 8 to open, at which time the degassing cylinder 5 and the oil filter bottle 9 are connected, and the alternating magnetic field generator is also controlled to be powered on; second, the circuit control module controls the first linear stepper motor 4 to move, first making the free end of the degassing limit switch baffle 43 do 15 reciprocating movements between the middle degassing limit switch 12 and the lower degassing limit switch 11, and then making the free end of the degassing limit switch baffle 43 stay at the middle degassing limit switch 12. At this time, negative pressure is generated in the degassing cylinder 5, forming degassing of the insulating oil, and the insulating oil moves up and down in the degassing cylinder 5, repeatedly passing through the magnetic induction rotating stirrer 7, which promotes the dissolution of the insulating oil. The gas is released and collected in the oil filter bottle 9, gradually reaching an oil-gas balance state; third, the circuit control module controls the degassing solenoid valve 8 to close, the degassing is completed, and a certain volume of the released gas is accumulated in the oil filter bottle 9; fourth, the circuit control module controls the oil return solenoid valve 14 to open; fifth, the circuit control module controls the first linear stepper motor 4 to move, so that the free end of the degassing limit switch baffle 43 moves upward from the middle degassing limit switch 12 to the upper degassing limit switch 13, and the insulating oil in the degassing cylinder 5 is pressed back into the waste oil tank 37, and the oil return is completed; sixth, the circuit control module controls the oil return solenoid valve 14 to close; seventh, the circuit control module controls the alternating magnetic field generator to be powered off;

[0090] Step 5, perform gas transfer processing: First, the circuit control module controls the degassing auxiliary solenoid valve 22 to open, at this time, the gas transfer cylinder 24 and the oil filter bottle 9 are connected; second, the circuit control module controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves downward from the upper gas transfer limit switch 28 to the lower gas transfer limit switch 27. At this time, negative pressure is generated in the gas transfer cylinder 24, and the gas in the oil filter bottle 9 is drawn into the gas transfer cylinder 24; third, the circuit control module controls the degassing auxiliary solenoid valve 22 to close; fourth, the circuit control module controls The second linear stepper motor 26 is controlled to move, so that the free end of the gas transfer limit switch baffle 52 moves upward from the lower gas transfer limit switch 27. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder 24 by detecting the signal of the second pressure sensor 29. When the pressure value in the gas transfer cylinder 24 is a normal pressure value, the second linear stepper motor 26 is controlled to stop moving; Fifth, the circuit control module calculates the amount of gas in the gas transfer cylinder 24 according to the number of running steps of the second linear stepper motor 26 and the volume of the gas transfer cylinder 24, and the transfer of the sample gas is completed at this time;

[0091] Step 6: Send the gas in the gas transfer cylinder 24 to the spectrum detection module 32 for detection and analysis:

[0092] If the amount of gas in the gas transfer cylinder 24 calculated in step 5 is greater than or equal to the amount required by the seven spectrum detection modules 32, it indicates that the escaped gas can meet the conditions for simultaneous sampling. At this time, the circuit control module controls the seven sampling solenoid valves 31 to open, and then controls the second linear stepper motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves upward, and the sample gas in the gas transfer cylinder 24 is pushed into the seven spectrum detection modules 32. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder 24 by detecting the signal of the second pressure sensor 29. When the pressure value in the gas transfer cylinder 24 is the normal pressure value, the second linear stepper motor 26 is controlled to stop moving, and then the seven spectrum detection modules 32 are controlled to perform detection and analysis. After the detection and analysis is completed, the second linear stepper motor 26 is controlled to move, so that the free end of the gas transfer limit switch baffle 52 moves downward to the lower gas transfer limit switch 27, and the sample gas is extracted from the seven spectrum detection modules 32. Finally, the seven sampling solenoid valves 31 are controlled to be closed;

[0093] If the amount of gas in the gas transfer cylinder 24 calculated in step 5 is less than the amount required by the seven spectrum detection modules 32, the circuit control module will send the gas in the gas transfer cylinder 24 to the seven spectrum detection modules 32 for detection and analysis in batches according to the amount of gas in the gas transfer cylinder 24, and the spectrum detection module 32 selected each time is different; in this process, the circuit control module will intelligently select and judge, and will give priority to the detection of the components of key concern;

[0094] The process of the circuit control module sending the gas in the gas transfer cylinder 24 into the spectrum detection module 32 for detection and analysis each time is as follows: first, controlling the injection solenoid valve 31 connected to the selected spectrum detection module 32 to open; second, controlling the second linear stepper motor 26 to move so that the free end of the gas transfer limit switch baffle 52 moves upward, and the sample gas is pushed into the spectrum detection module 32 of the specified component. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder 24 by detecting the signal of the second pressure sensor 29. When the pressure value in the gas transfer cylinder 24 is the normal pressure value, the second linear stepper motor 26 is controlled to stop moving; third, controlling the selected spectrum detection module 32 for detection and analysis; fourth, controlling the second linear stepper motor 26 to move so that the free end of the gas transfer limit switch baffle 52 moves downward to the lower gas transfer limit switch 27, and the sample gas is extracted from the specified spectrum detection module 32; fifth, controlling the injection solenoid valve 31 connected to the selected spectrum detection module 32 to close;

[0095] After the sample gas is pushed into the spectrum detection module 32, the laser source 33 on the spectrum detection module 32 irradiates it with a laser of a specific wavelength. The components to be measured in the sample gas are agitated under the action of the laser to form sound waves. This signal is sensed and recorded by the spectrum module. The concentration of the sample gas can be obtained by the signal size, and the concentration of the oil sample can be inferred by the concentration of the sample gas.

[0096] Step 7, filter and exhaust purge: First, the circuit control module controls the filter and exhaust solenoid valve 16 and the first air supply solenoid valve 21 to open, and the carrier gas in the carrier gas tank 17 flows into the oil filter bottle 9, and the insulating oil residue in the oil filter bottle 9 is discharged from the filter and exhaust solenoid valve 16; Second, the circuit control module controls the filter and exhaust solenoid valve 16 and the first air supply solenoid valve 21 to close, and the filter and exhaust purge action is completed;

[0097] Venting: the circuit control module controls the venting solenoid valve 23 to open, and then controls the second linear stepping motor 26 to move, so that the free end of the gas transfer limit switch baffle 52 moves upward to the upper gas transfer limit switch 28, discharges the sample gas in the gas transfer cylinder 24, and finally controls the venting solenoid valve 23 to close;

[0098] After completing the analysis of the sample gas, the circuit control module calculates the concentration of dissolved gas in the insulating oil based on parameters such as oil sample volume, sample gas volume, sample gas concentration, and degassing rate, and gives the final result.

Claims

1. A spectrometer for detecting dissolved gases in insulating oil, characterized in that: Contains a degassing device, a gas transfer device, a spectrum detection device, a carrier gas tank and a circuit control module; The degassing device comprises a first linear stepper motor, a degassing cylinder, an oil filter bottle, an oil inlet solenoid valve, an oil return solenoid valve, a degassing solenoid valve, a filter exhaust solenoid valve, a first air supply solenoid valve, a degassing auxiliary solenoid valve, a first pressure sensor, a spring, a magnetic induction rotary stirrer, an alternating magnetic field generator, three degassing limit switches, a degassing limit switch baffle and a first bracket; the first linear stepper motor and the degassing cylinder are both fixedly mounted on the first bracket, and the first linear stepper motor is below the degassing cylinder, the telescopic rod of the first linear stepper motor is vertically arranged upward, the opening of the degassing cylinder is vertically arranged downward, a first piston is installed in the degassing cylinder, the piston rod on the first piston is vertically arranged, the upper end of the piston rod on the first piston is fixedly connected to the lower surface of the first piston, and the first The lower end of the piston rod on the piston is fixedly connected to the upper end of the telescopic rod of the first linear stepping motor; the degassing cylinder top cover on the upper part of the degassing cylinder is sealed and connected to the degassing cylinder, and the oil inlet solenoid valve, oil return solenoid valve, degassing solenoid valve and the first pressure sensor are all installed on the degassing cylinder top cover, and the outlet of the oil inlet solenoid valve, the inlet of the oil return solenoid valve, the lower port of the degassing solenoid valve and the detection port of the first pressure sensor are connected to the interior of the degassing cylinder through the connecting channel inside the degassing cylinder top cover; the spring and the magnetic induction rotary agitator are both installed inside the degassing cylinder, the upper end of the spring is fixedly connected to the inner surface of the degassing cylinder top cover, the lower end of the spring is fixedly connected to the upper surface of the magnetic induction rotary agitator, and the alternating magnetic field generator is installed around the outside of the degassing cylinder and close to the magnetic induction rotary agitator The place where the agitator is turned; the lower opening of the degassing solenoid valve is connected to the upper surface of the degassing cylinder top cover, the upper opening of the degassing solenoid valve is connected to the bottom of the oil filter bottle, and the upper opening of the degassing solenoid valve is connected to the inside of the oil filter bottle; an oil filter membrane is laterally arranged inside the oil filter bottle, and a filter outlet is arranged on the side of the oil filter bottle, the filter outlet is located below the oil filter membrane, and the inlet of the filter outlet solenoid valve is connected to the filter outlet; the oil filter bottle top cover on the upper part of the oil filter bottle is sealed with the oil filter bottle, the first air supply solenoid valve and the degassing auxiliary solenoid valve are both installed on the oil filter bottle top cover, and the outlet of the first air supply solenoid valve and the inlet of the degassing auxiliary solenoid valve are connected to the inside of the oil filter bottle through the connecting channel inside the oil filter bottle top cover; the three degassing limit switches are the upper degassing limit switch, the middle degassing limit switch and the lower degassing limit switch. Limit switch, the three degassing limit switches are all through-beam photoelectric switches, the three degassing limit switches are all installed on the first bracket, and the upper degassing limit switch, the middle degassing limit switch and the lower degassing limit switch are arranged in sequence from top to bottom; one end of the degassing limit switch baffle is fixedly connected to the telescopic rod of the first linear stepping motor, or fixedly connected to the piston rod of the first piston, or fixedly connected to the connection between the telescopic rod of the first linear stepping motor and the piston rod of the first piston, and the other end of the degassing limit switch baffle is a free end; when the telescopic rod of the first linear stepping motor is extended and retracted up and down, the degassing limit switch baffle is driven to move back and forth up and down, so that the free end of the degassing limit switch baffle passes between the transmitting tube and the receiving tube of the three degassing limit switches in sequence; The gas transfer device includes a second linear stepper motor, a gas transfer cylinder, a venting solenoid valve, a second gas replenishing solenoid valve, a second pressure sensor, two gas transfer limit switches, a gas transfer limit switch baffle and a second bracket; the second linear stepper motor and the gas transfer cylinder are fixedly mounted on the second bracket, and the second linear stepper motor is below the gas transfer cylinder, the telescopic rod of the second linear stepper motor is vertically arranged upward, the opening of the gas transfer cylinder is vertically arranged downward, a second piston is installed in the gas transfer cylinder, the piston rod on the second piston is vertically arranged, and the second The upper end of the piston rod on the piston is fixedly connected to the lower surface of the second piston, and the lower end of the piston rod on the second piston is fixedly connected to the upper end of the telescopic rod of the second linear stepping motor; the gas transfer cylinder top cover on the upper part of the gas transfer cylinder is sealed with the gas transfer cylinder, the venting solenoid valve, the second gas replenishing solenoid valve and the second pressure sensor are all installed on the gas transfer cylinder top cover, and the gas transfer cylinder top cover is also provided with an air inlet and an air outlet, and the air inlet, the air outlet, the outlet of the second gas replenishing solenoid valve, the inlet of the venting solenoid valve and the detection port of the second pressure sensor are connected through the gas transfer The connecting passage inside the top cover of the transfer cylinder is connected with the inside of the gas transfer cylinder; the two gas transfer limit switches are respectively an upper gas transfer limit switch and a lower gas transfer limit switch, and the two gas transfer limit switches are both opposing photoelectric switches, and the two gas transfer limit switches are both installed on the second bracket, and the upper gas transfer limit switch is located directly above the lower gas transfer limit switch; one end of the gas transfer limit switch baffle is fixedly connected to the telescopic rod of the second linear stepping motor, or fixedly connected to the piston rod of the second piston, or fixedly connected to the connection between the telescopic rod of the second linear stepping motor and the piston rod of the second piston, and the other end of the gas transfer limit switch baffle is a free end; when the telescopic rod of the second linear stepping motor is extended and retracted up and down, the gas transfer limit switch baffle is driven to move back and forth up and down, so that the free end of the gas transfer limit switch baffle passes between the transmitting tube and the receiving tube of the two gas transfer limit switches in sequence; the spectrum detection device contains N spectrum detection modules and N sampling solenoid valves, and the outlets of the N sampling solenoid valves are respectively connected to the sampling ports of the N spectrum detection modules, and N is a natural number greater than or equal to 1; The outlet of the degassing auxiliary solenoid valve in the degassing device is connected to the air inlet in the gas transfer device; the inlet of the first air replenishment solenoid valve in the degassing device and the inlet of the second air replenishment solenoid valve in the gas transfer device are both connected to the outlet of the carrier gas tank; the air outlet in the gas transfer device is connected to the inlets of N injection solenoid valves in the spectrum detection device; the circuit control module is connected to the first linear stepping motor, the oil inlet solenoid valve, the oil return solenoid valve, the degassing solenoid valve, the filter and exhaust solenoid valve, the first air replenishment solenoid valve, the degassing auxiliary solenoid valve, the first pressure sensor, the alternating magnetic field generator, three degassing limit switches, the second linear stepping motor, the venting solenoid valve, the second air replenishment solenoid valve, the second pressure sensor, two gas transfer limit switches, N spectrum detection modules and N injection solenoid valves.

2. The spectrometer for dissolved gas in insulating oil according to claim 1, characterized in that: It also contains an oil sample box, a waste oil box, a filter, an oil inlet pipe and an oil drain pipe. The outlet of the oil sample box is connected to the inlet of the oil inlet solenoid valve through the filter and the oil inlet pipe in sequence, and the outlet of the oil return solenoid valve is connected to the waste oil box through the oil drain pipe; the inlet of the first air replenishment solenoid valve in the degassing device and the inlet of the second air replenishment solenoid valve in the gas transfer device are connected to the outlet of the carrier gas tank through a tee; a carrier gas pressure sensor is installed on the carrier gas tank, and a flow sensor is installed on the outlet of the carrier gas tank; the spectrum detection module is a laser spectrum detection module; the value range of N is 1 to 15.

3. The spectrometer for dissolved gas in insulating oil according to claim 1, characterized in that: The outlet of the second air replenishment solenoid valve and the inlet of the air venting solenoid valve are both connected to the side of the gas transfer cylinder top cover, and the detection port of the second pressure sensor is connected to the upper surface of the gas transfer cylinder top cover; the second bracket is a transversely placed U-shaped bracket, and the second bracket contains a second upper horizontal plate, a second lower horizontal plate, and a second lateral vertical plate. The lower end of the gas transfer cylinder is fixed on the upper surface of the second upper horizontal plate, and the piston rod of the second piston in the gas transfer cylinder vertically passes through the second upper horizontal plate from the upper surface of the second upper horizontal plate downward, the upper end of the second linear stepper motor is fixed on the lower surface of the second lower horizontal plate, and the telescopic rod of the second linear stepper motor vertically passes through the second lower horizontal plate from the lower surface of the second lower horizontal plate upward and is connected to the piston rod of the second piston; two gas transfer limit switches are fixed on the second lateral vertical plate.

4. The spectrometer for dissolved gas in insulating oil according to claim 1, characterized in that: The magnetic induction rotary stirrer comprises a rotary turbine, a turbine mesh cover and two magnet blocks. The rotary turbine is installed in the turbine mesh cover. The lower end of the spring is fixedly connected to the upper surface of the turbine mesh cover. The rotating shaft of the rotary turbine is vertically arranged, and the upper and lower ends of the rotating shaft of the rotary turbine are respectively installed in the rotating shaft holes on the upper surface and the lower surface of the turbine mesh cover. The two magnet blocks are respectively embedded in the two magnet mounting holes on the rotary turbine blades, and the two magnet mounting holes are symmetrically arranged on both sides of the rotating shaft of the rotary turbine; the alternating magnetic field generator comprises six coils and a coil shell. The coil shell is an annular tubular shell sleeved on the outer surface of the degassing cylinder. The six coils are all installed in the coil shell, and the six coils are evenly surrounded by the degassing cylinder. Every two oppositely arranged coils are connected in series to form a coil group. The six coils form three coil groups in total. The center lines of the two oppositely arranged coils coincide with a diameter of the degassing cylinder.

5. The spectrometer for dissolved gas in insulating oil according to claim 4, characterized in that: The rotating turbine contains inclined blades; the turbine mesh cover contains an upper mesh cover body and a lower mesh cover body connected together; the magnet block is made of neodymium magnets; a pull rod extending vertically downward is provided around the lower surface of the degassing cylinder top cover, the degassing cylinder top cover is connected to the first bracket through the pull rod, and the coil shell of the alternating magnetic field generator passes through the pull rod and is fixed around the outer side surface of the degassing cylinder.

6. The spectrometer for dissolved gas in insulating oil according to claim 1, characterized in that: When the free end of the degassing limit switch baffle is located between the transmitting tube and the receiving tube of the upper degassing limit switch, the spring is compressed by the first piston; when the free end of the degassing limit switch baffle is located between the transmitting tube and the receiving tube of the middle degassing limit switch, the spring is completely released.

7. The spectrometer for dissolved gas in insulating oil according to claim 1, characterized in that: The outlet of the oil inlet solenoid valve, the inlet of the oil return solenoid valve and the detection port of the first pressure sensor are all connected to the side of the top cover of the degassing cylinder; the first bracket is a transversely placed U-shaped bracket, the first bracket comprises a first upper horizontal plate, a first lower horizontal plate and a first lateral vertical plate, the lower end of the degassing cylinder is fixed on the upper surface of the first upper horizontal plate, the piston rod of the first piston in the degassing cylinder vertically passes through the first upper horizontal plate from the upper surface of the first upper horizontal plate downward, the upper end of the first linear stepper motor is fixed on the lower surface of the first lower horizontal plate, the telescopic rod of the first linear stepper motor vertically passes through the first lower horizontal plate from the lower surface of the first lower horizontal plate upward and is connected to the piston rod of the first piston; three degassing limit switches are fixed on the first lateral vertical plate, and the upper degassing limit switch, the middle degassing limit switch and the lower degassing limit switch are evenly arranged in sequence from top to bottom.

8. A control method for the spectrometer for dissolved gas in insulating oil according to any one of claims 1 to 7, characterized in that: The circuit control module controls the oil inlet solenoid valve, the degassing solenoid valve, the degassing auxiliary solenoid valve, the filter and exhaust solenoid valve, the first gas supply solenoid valve, the second gas supply solenoid valve and the N injection solenoid valves to be closed, and controls the oil return solenoid valve and the vent solenoid valve to be opened; then controls the first linear stepper motor to move so that the free end of the degassing limit switch baffle moves to the upper degassing limit switch, and controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves to the upper gas transfer limit switch; then, the circuit control module controls the oil return solenoid valve and the vent solenoid valve to be closed; then, the following operations are performed: Step 1: Perform M oil line flushing, where M is a natural number greater than or equal to 1; The process of each oil circuit flushing is as follows:

1. The circuit control module controls the oil inlet solenoid valve to open; 2. The circuit control module controls the movement of the first linear stepper motor to move the free end of the degassing limit switch baffle from the upper degassing limit switch downward to the lower degassing limit switch; 3. The circuit control module determines whether the degassing cylinder is full of insulating oil by detecting the signal of the first pressure sensor. If the degassing cylinder is full of insulating oil, the circuit control module controls the oil inlet solenoid valve to close and the oil return solenoid valve to open; 4. The circuit control module controls the movement of the first linear stepper motor to move the free end of the degassing limit switch baffle from the lower degassing limit switch upward to the upper degassing limit switch; 5. The circuit control module determines whether the insulating oil in the degassing cylinder has been drained by detecting the signal of the first pressure sensor. If the insulating oil in the degassing cylinder has been drained, the circuit control module controls the oil return solenoid valve to close; Step 2: First, flush the gas circuit, and then the circuit control module reads the monitoring results of N spectrum detection modules; when the gas component content monitored by all spectrum detection modules is 0, execute to step 3, otherwise, execute again to step 2; The process of gas circuit flushing is as follows:

1. The circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to open; 2. The circuit control module controls the movement of the second linear stepper motor to make the free end of the gas transfer limit switch baffle move downward from the upper gas transfer limit switch to the lower gas transfer limit switch; 3. The circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to close, and then controls the venting solenoid valve to open; 4. The circuit control module controls the movement of the second linear stepper motor to make the free end of the gas transfer limit switch baffle move upward from the lower gas transfer limit switch to the upper gas transfer limit switch; 5. The circuit control module controls the venting solenoid valve to close, and controls the first gas supply solenoid valve, the second gas supply solenoid valve and N injection solenoid valves to open; 6. The circuit control module controls the first gas supply solenoid valve, the second gas supply solenoid valve and N injection solenoid valves to close; Step 3, pre-degassing treatment: oil filling and vacuuming; The oil inlet process is as follows: first, the circuit control module controls the oil inlet solenoid valve to open; second, the circuit control module controls the first linear stepper motor to move so that the free end of the degassing limit switch baffle moves downward from the upper degassing limit switch to the middle degassing limit switch; third, the circuit control module determines whether the degassing cylinder is full of insulating oil by detecting the signal of the first pressure sensor. If the degassing cylinder is full of insulating oil, the circuit control module controls the oil inlet solenoid valve to close; The vacuuming process is as follows:

1. The circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to open; 2. The circuit control module controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves downward from the upper gas transfer limit switch to the lower gas transfer limit switch; 3. The circuit control module controls the degassing auxiliary solenoid valve and N injection solenoid valves to close, and controls the venting solenoid valve to open; 4. The circuit control module controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves upward from the lower gas transfer limit switch to the upper gas transfer limit switch; 5. The circuit control module controls the venting solenoid valve to close; Step 4, first perform degassing, then the circuit control module calculates the amount of gas released according to the detection signal of the first pressure sensor and the volume of the oil filter bottle; if the amount of gas released is less than a predetermined value, execute to step 4 after re-filling the oil; if the amount of gas released is greater than or equal to the predetermined value, execute to step 5; The degassing process is as follows: first, the circuit control module controls the degassing solenoid valve to open, and also controls the alternating magnetic field generator to power on; second, the circuit control module controls the movement of the first linear stepper motor, firstly makes the free end of the degassing limit switch baffle do P times of reciprocating motion between the middle degassing limit switch and the lower degassing limit switch, P is a natural number greater than or equal to 1, and then makes the free end of the degassing limit switch baffle stay at the middle degassing limit switch; third, the circuit control module controls the degassing solenoid valve to close; fourth, the circuit control module controls the oil return solenoid valve to open; fifth, the circuit control module controls the movement of the first linear stepper motor, so that the free end of the degassing limit switch baffle moves upward from the middle degassing limit switch to the upper degassing limit switch; sixth, the circuit control module controls the oil return solenoid valve to close; seventh, the circuit control module controls the alternating magnetic field generator to power off; Step 5, perform gas transfer processing:

1. The circuit control module controls the degassing auxiliary solenoid valve to open; 2. The circuit control module controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves downward from the upper gas transfer limit switch to the lower gas transfer limit switch; 3. The circuit control module controls the degassing auxiliary solenoid valve to close; 4. The circuit control module controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves upward from the lower gas transfer limit switch. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor. When the pressure value in the gas transfer cylinder is the normal pressure value, the second linear stepper motor is controlled to stop moving; 5. The circuit control module calculates the amount of gas in the gas transfer cylinder according to the number of running steps of the second linear stepper motor and the volume of the gas transfer cylinder; Step 6. Send the gas in the gas transfer cylinder to the spectrum detection module for detection and analysis: If the amount of gas in the gas transfer cylinder calculated in step 5 is greater than or equal to the amount required by the N spectral detection modules, the circuit control module controls the N injection solenoid valves to open, and then controls the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves upward. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor. When the pressure value in the gas transfer cylinder is a normal pressure value, the second linear stepper motor is controlled to stop moving. Then, the N spectral detection modules are controlled to perform detection and analysis. After the detection and analysis are completed, the second linear stepper motor is controlled to move so that the free end of the gas transfer limit switch baffle moves downward to the lower gas transfer limit switch. Finally, the N injection solenoid valves are controlled to close. If the amount of gas in the gas transfer cylinder calculated in step 5 is less than the amount required by the N spectrum detection modules, the circuit control module sends the gas in the gas transfer cylinder to the N spectrum detection modules in batches according to the amount of gas in the gas transfer cylinder for detection and analysis, and the spectrum detection module selected each time is different; The process of the circuit control module sending the gas in the gas transfer cylinder into the spectrum detection module for detection and analysis each time is as follows: first, controlling the injection solenoid valve connected to the selected spectrum detection module to open; second, controlling the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves upward. At the same time, the circuit control module determines the pressure value in the gas transfer cylinder by detecting the signal of the second pressure sensor. When the pressure value in the gas transfer cylinder is the normal pressure value, the second linear stepper motor is controlled to stop moving; third, controlling the selected spectrum detection module to perform detection and analysis; fourth, controlling the second linear stepper motor to move so that the free end of the gas transfer limit switch baffle moves downward to the lower gas transfer limit switch; and fifth, controlling the injection solenoid valve connected to the selected spectrum detection module to close.

9. The control method according to claim 8, characterized in that: After step 6, step 7 is further included, performing filter and exhaust purge: first, the circuit control module controls the filter and exhaust solenoid valve and the first air supply solenoid valve to open; second, the circuit control module controls the filter and exhaust solenoid valve and the first air supply solenoid valve to close; Venting: the circuit control module controls the venting solenoid valve to open, and then controls the second linear stepper motor to move, so that the free end of the gas transfer limit switch baffle moves upward to the upper gas transfer limit switch, and finally controls the venting solenoid valve to close; The value range of M is 3 to 10; the value range of P is 5 to 30.

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