A fully automatic flushing method for transformer fragments

Abstract

The present invention relates to a fully automatic flushing device for transformer chips, comprising: an integrated machine control cabinet equipped with a touch screen and a PLC control device, and a flushing pipeline for connecting an oil storage tank and chips, the flushing pipeline comprising an oil pump for driving oil to flow in the pipeline, and an electric valve, an electric ball valve, an electric valve, a manual ball valve, a manual butterfly valve, a coarse filter, and a fine filter, the electric valve, the electric ball valve, and the electric valve are electrically connected to the PLC control device through cable accessories; the PLC control device is provided with a control module and a display module. The present invention also relates to a fully automatic flushing method for transformer chips. The present invention does not occupy a driving crane and an oil filter for a long time; a large flow oil pump automatically flushes to improve work efficiency; 10 groups of chips of different or same specifications can be flushed at the same time; a special oil tank provides qualified flushing oil; it can be used in conjunction with an existing oil filter and a large-capacity flushing device; it can realize independent automatic flushing and filtering to improve work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer operation and maintenance, and in particular relates to a method for fully automatic flushing of transformer fragments. Background Art

[0002] Transformer heat sinks are usually referred to as transformer heat sinks. Welding slag, dust and other debris in transformer heat sinks are not easy to clean. Due to the complex internal structure of the transformer, once impurities enter the transformer, it is difficult to flush them out, which can easily cause partial discharge or even breakdown.

[0003] At the same time, since the internal impurities of the transformer fragments will contaminate the transformer oil, it is necessary to extend the oil filter cycle time. Ultra-high voltage products also need to be deeply cleaned with special large-flow flushing equipment, which will extend the construction period and waste labor, materials and energy.

[0004] At present, transformer parts are mainly flushed by manufacturers before leaving the factory. For users, the quality of flushing is difficult to supervise and guarantee.

[0005] In addition, the flakes of important products are currently connected to the oil filter pipeline and lifted by a crane for flushing, which occupies the oil filter and takes a long time to drive, is time-consuming and labor-intensive, and the flushing effect is difficult to monitor. Summary of the invention

[0006] The present invention provides a fully automatic flushing device and method for transformer oil fragments, which utilizes a large-flow circulating oil pump, uses a transformer oil online detection system to monitor the flushing effect, and adopts ten flushing modes such as forward and reverse flushing to achieve fully automatic flushing of fragments. The technical solutions adopted by the present invention are as follows:

[0007] A fully automatic flushing device for transformer parts, comprising: an integrated machine control cabinet equipped with a touch screen and a PLC control device, and a flushing pipeline for connecting an oil storage tank and parts, the flushing pipeline comprising an oil pump for driving oil to flow in the pipeline, and an electric valve, an electric ball valve, a manual ball valve, a manual butterfly valve, a coarse filter, and a fine filter, the electric valve and the electric ball valve being electrically connected to the PLC control device through cable accessories; the PLC control device being provided with a control module for controlling the opening and closing of the electric valve and the electric ball valve; the touch screen being used for displaying the opening and closing requirements of the manual valve corresponding to the control process, and the user selecting the corresponding flushing mode through the touch screen.

[0008] A fully automatic flushing method for transformer fragments comprises the following steps:

[0009] Step 1. Select the control function required for flake flushing, check whether the opening or closing status of the relevant valves is correct, and click the start button;

[0010] Step 2: The electric valve and the electric ball valve start to execute according to the preset pipeline, the oil pump motor is started, and the timing of the sheet flushing begins;

[0011] Step 3: Determine whether the timing time is up, whether the particle size meets the requirements, whether the flow is cut off, whether it is ended manually, whether the oil sample is tested, and finally turn off the oil pump motor, turn off the automatic control, and generate a fragment flushing report.

[0012] Beneficial effects of the present invention:

[0013] 1) Do not occupy the vehicle and oil filter for a long time;

[0014] 2) Large flow oil pump automatically flushes to improve work efficiency;

[0015] 3) Can wash 10 groups of flakes of different or same specifications at the same time;

[0016] 4) Special oil tanks provide qualified flushing oil;

[0017] 5) It can be used in conjunction with existing oil filters and large-capacity flushing devices;

[0018] 6) It can realize independent automatic flushing and filtering. Only qualified and clean pieces will be installed on the transformer, eliminating a source of pollution;

[0019] 7) The impurities in the filter bag can be weighed and used as evidence of the washing quality of the flake manufacturer, thus achieving the purpose of incoming inspection;

[0020] 8) The online detection system can automatically adjust the flushing time according to the cleanliness level, thereby greatly shortening the flushing time and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the present invention. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work.

[0022] Figure 1 Schematic diagram of the entire pipeline structure of the flushing oil circuit according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of an oil circuit for flake flushing according to an embodiment of the present invention;

[0024] Figure 3 is a circuit connection diagram of an embodiment of the present invention;

[0025] Figure 4is a schematic diagram of the deployment of electronic components in an embodiment of the present invention;

[0026] Figure 5 It is a logic block diagram of the steps in the preparation stage for the start of film washing according to an embodiment of the present invention;

[0027] Figure 6 It is a logic block diagram of the steps in the preparation phase of the film-dispersed washing timing according to an embodiment of the present invention;

[0028] Figure 7 It is a logic block diagram of the steps of the film-dispersed washing process according to an embodiment of the present invention.

[0029] In the figure, D01-08 is an electric valve, D09 is an electric ball valve, Q01-04 is a manual ball valve, N01-18 is a manual butterfly valve in the oil circuit area, Nz, Nx, Ny, Nt, and Nw are manual butterfly valves in the main pipe area, K01 is an online particle size monitor, and C01-03 is an oil sampling device. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] A fully automatic flushing device for transformer bulk, comprising: an integrated machine control cabinet equipped with a touch screen and a PLC control device, and a flushing pipeline for connecting an oil storage tank and a bulk, the flushing pipeline comprising an oil pump for driving oil to flow in the pipeline, an electric valve, an electric ball valve, a manual ball valve, a manual butterfly valve, a coarse filter, and a fine filter, the flushing pipeline comprising: a first pipeline - a bulk flushing oil inlet pipeline, a second pipeline - a bulk flushing oil return pipeline, a third pipeline - a bulk oil drain pipeline, and a fourth pipeline - an external oil filter flushing pipeline; the electric valve and the electric ball valve are electrically connected to the PLC control device through cable accessories; the PLC control device is provided with a control module for controlling the opening and closing of the electric valve and the electric ball valve; the touch screen is used to display the opening and closing requirements of the manual valve corresponding to the control process, and the user selects the corresponding flushing mode through the touch screen.

[0032] The first pipeline - the bulk flushing oil inlet pipeline, includes the oil storage tank - oil sampling device - manual butterfly valve - electric valve - manual butterfly valve - oil pump - manual butterfly valve - fine filter - manual butterfly valve - electric valve - oil sampling device - upper mother pipe - each branch riser - each bulk inlet manual butterfly valve - each bulk outlet manual butterfly valve - converge into the lower mother pipe - oil discharge pipeline.

[0033] Function: Use the oil pump to filter the transformer oil in the oil storage tank through the fine filter and then pump it into each piece of bulk to flush out the impurities in the bulk.

[0034] The second pipeline - the fragment flushing oil return pipeline, includes the oil discharge pipeline manual butterfly valve - online particle size monitor - oil sampling device - electric valve - manual butterfly valve - coarse filter - manual butterfly valve - fine filter - electric valve - manual butterfly valve - oil storage tank connected in sequence.

[0035] Function: The washed transformer oil is filtered through a coarse filter and a fine filter, leaving impurities in the filter bag, purifying the transformer oil and recycling it for the next round of flushing.

[0036] The third pipeline - the scattered oil drainage pipeline, includes the upper mother pipe - exhaust pipe - electric ball valve - manual ball valve - upper mother pipe - each branch riser - each scattered inlet manual butterfly valve - each scattered outlet manual butterfly valve - converge into the lower mother pipe - oil discharge pipeline manual butterfly valve - online particle size monitor - oil sampling device - electric valve - manual butterfly valve - coarse filter - manual butterfly valve - fine filter - electric valve - manual butterfly valve - oil pump - manual butterfly valve - electric valve - manual butterfly valve - oil storage tank.

[0037] Function: Use the power of the oil unloading pump to quickly unload the residual oil in the flow of loose pieces. After two-stage filtration and purification, it enters the oil storage tank for recycling, and no oil pollution pollutes the environment when disassembling the loose pieces.

[0038] The fourth pipeline - the external oil filter flushing pipeline, includes the oil storage tank - oil sampling device - manual butterfly valve - electric valve - manual ball valve - oil filter - oil sampling device - upper mother pipe - each branch riser - each piece of bulk inlet manual butterfly valve - each piece of bulk outlet manual butterfly valve - converge into the lower mother pipe - oil discharge pipeline - online particle size monitor - oil sampling device - manual ball valve - hose - manual ball valve - electric valve - manual butterfly valve - oil storage tank connected in sequence.

[0039] Function: Deep cleaning of the ultra-high voltage transformer or other reasons. Use vacuum oil filter or large-capacity flushing equipment to deeply clean the oil pump and filter.

[0040] like Figure 1 FIG. 1 is a schematic diagram of the structure of the entire flushing oil circuit according to an embodiment of the present invention. The oil flow direction and function of the pipeline in the ten modes are different. The figure shows the structure of the entire pipeline and the connection relationship of the components.

[0041] 1.1DN80 manual ball valve.

[0042] There are 4 items, numbered Q01-04, all of which are external interface valves used to connect to external oil filters or large-flow flushing devices. They are usually closed manually and opened on demand after connecting to external equipment.

[0043] 1.2 Pieces are installed separately.

[0044] This part has an upper mother pipe and a lower mother pipe, which are used for confluence. When flushing, the oil in the oil tank enters the upper mother pipe from the top, and then flows into each group of fragments through the branch pipe joint valves NT \NX \NY (different valves correspond to different specifications of the upper interface of the fragments, which are closed at ordinary times and opened only when connected to the fragments), and then flows out from the lower pipe joint NW of the fragments, merges into the lower mother pipe, and flows from the lower pipeline through the online particle size tester and then flows back to the oil tank. There are manual butterfly valves NZ on the top and bottom of each riser. The upper part is normally open, and the lower part is only opened when the pipeline itself needs to be flushed. The purpose is to clean the oil and impurities in the pipeline of the system itself. There is a small electric ball valve on the upper part of the upper mother pipe, numbered D09, and a matching manual ball valve, numbered Q05. The manual ball valve is used to match the electric ball valve, and the state is normally open. The electric ball valve automatically opens when unloading oil to avoid vacuum in the pipeline and cause oil discharge difficulties.

[0045] 1.3 Online particle size monitor.

[0046] No. K01, installed in the outlet pipeline of the lower mother pipe, is used to display the value of the transformer oil particle size in the pipeline in real time and automatically store it in the control system. The transformer oil particle size value can be used as a condition to stop flushing in the control system, and can be used as a basis for qualitative analysis of the degree of internal contamination of the flakes. The automatic flushing time can be adjusted and set according to its curve chart, forming a fixed program for flakes of different structural specifications.

[0047] 1.4 Oil sampling device at measuring point.

[0048] No. C01-03, general products only need to detect the particle size of transformer oil, but for ultra-high voltage products and users with special requirements, the transformer oil test index requirements such as withstand voltage and water content will be increased. Three oil sampling ports are set up. C01 is on the outlet pipeline of the lower mother pipe to measure the oil index that has just flowed out of the bulk and merged into the lower mother pipe. C02 is on the inlet pipeline of the upper mother pipe to measure the oil index that has just flowed into the upper mother pipe and entered the bulk. C03 is located at the outlet of the oil storage tank to measure the oil index that flows out of the oil storage tank.

[0049] 1.5 Oil storage tank.

[0050] Model YG, with one oil outlet at the bottom and two oil return ports at the top. Used for storage and as a buffer transformer oil container during oil circulation and flushing.

[0051] 1.6 Coarse filter.

[0052] No. GLC. One is installed on the oil pipeline flowing out of the flakes, and is used for preliminary filtration of large particles of impurities after flushing. It is a bag filter. After shutdown, the filter bag can be quickly taken out to check the nature and quantity of impurities, and qualitatively and quantitatively analyze the quality of flushing by the flake manufacturer and the reasons and types of impurities in the flakes.

[0053] 1.7 Fine filter.

[0054] No. GLJ01-02. GLJ01 is used in the oil pipeline entering the oil tank to filter out impurities from the flakes or crude oil and purify the oil quality. GLJ02 is used in the oil pipeline entering the flakes to ensure the cleanliness of the oil entering the flakes and avoid secondary contamination of the flakes.

[0055] 1.8 Oil pump.

[0056] No. B01. One is used in pipelines and has two functions. One is used as the power of circulating flushing, which makes the oil flow quickly in the pipeline; the other is used as the power of oil unloading, which quickly pumps the oil in the flakes into the oil storage tank.

[0057] 1.9 Electric valve. Model D01-08. Automatically control the oil circuit on and off through the control system to meet different working conditions.

[0058] 1.10 Manual butterfly valves for oil circuits. Numbers N01-18, manually control the on-off of the oil circuit, excluding butterfly valves for bulk installation, risers, and upper and lower main pipes. 8 are manual butterfly valves matching electric valves, numbered N01-08, which correspond to the same numbers as the electric valve D**, and are used to replace the opening and closing when the electric valve is repaired or damaged. 6 manual butterfly valves matching filter repair, numbered N09-N14. 1 is for oil pump inlet repair, numbered N15. 1 is used in conjunction with the flushing bulk area, numbered N16. 2 are connected to the oil return port of the oil storage tank, numbered N17-18. All manual butterfly valves are normally in the open state.

[0059] The position and function of the manual butterfly valve are considered from a process perspective. For example, N02 is at the lowest position, which is easy to store oil during disassembly and assembly, and is easy to control with a valve. The upper opening of the oil tank is equipped with a valve for pressure testing and leak testing to avoid problems such as contamination of the upper opening during storage.

[0060] In the embodiment of the present invention, the flushing effect is monitored by an online transformer oil detection system. There is a threaded connection pipe joint on the pipeline, which is threadedly connected to the probe base. The probe is inserted into the pipeline to dynamically measure the particle size, and the data has an automatic storage function. The flushing effect can be analyzed by detecting data changes, and the flushing is stopped after the particle size value meets the requirements and stabilizes for a certain period of time. The data line is connected to the all-in-one machine, and the logical relationship controls the automatic shutdown after the set conditions are met. Through the analysis of a large amount of data, it can be summarized how long it takes for the sheets of different models and specifications and manufacturers to meet the cleanliness requirements, so as to formulate targeted process plans and save flushing time and power consumption.

[0061] In the embodiment of the present invention, the electric valve needs to be frequently opened and closed according to different functions, and is usually in a closed state. The manual ball valve only needs to be opened when an external oil filter or other equipment is connected, and is usually in a closed state. Most of the pipelines are normally open for standby or maintenance. The area for flushing the main pipe of the diffuser is manually opened according to the number and position of the diffusers installed. If electric control is used, it is difficult to judge whether the diffusers have been installed, which may cause safety hazards.

[0062] In the embodiment of the present invention, the upper and lower main pipes are pipes with a relatively large diameter, which play the role of converging and diverting the oil to each disperser. The inlet and outlet oil pipelines are connected to the upper part, and after the oil enters, it enters different ten groups of dispersers from each branch pipe, allowing one to ten groups of dispersers to be connected at a time, and the branch valves are opened according to the disperser situation.

[0063] like Figure 2 The figure shows a schematic diagram of the oil circuit for flushing the fan in an embodiment of the present invention. The figure shows the oil circuit structure for flushing the fan with thick lines. This is the most commonly used flushing oil circuit. The qualified transformer oil is stored in the oil tank. The oil is filtered through the fine filter by the oil pump to ensure that the cleanliness of the oil entering the fan meets the requirements. The oil enters the upper main pipe from the upper oil inlet pipe, and then flows into the fan through ten branch risers and the upper butterfly valve of the fan. After flushing the entire internal cavity of the fan, it flows into the lower main pipe from the lower oil outlet of the fan through ten branch pipes. The particle size detector installed on the oil outlet pipeline at the bottom of the lower main pipe will automatically measure and record the real-time particle size. Then the transformer oil and the impurities flushed down enter the coarse filter for primary filtration, and then enter the fine filter for secondary filtration, and then enter the oil storage tank from the upper oil return pipe. This process is the most commonly used forward flushing process.

[0064] like Figure 3 The figure is a circuit connection diagram of an embodiment of the present invention. The circuit adopts a three-phase four-wire system as the total input power supply, adopts a switching power supply to provide a 24V DC power supply for the circuit, adopts a Siemens PLC as a central processor to collect external related signals and drive the intermediate relay, and drives the corresponding electric valve, electric ball valve and actuator through the intermediate relay contacts to meet the flushing requirements.

[0065] like Figure 4 The figure shows the deployment diagram of the electronic components of the embodiment of the present invention. The control components are divided into a high-voltage wiring board and a human-machine interface. The high-voltage wiring board is fixed inside the all-in-one control cabinet. The human-machine interface is a Siemens 7-inch touch screen, which is fixed at the front of the all-in-one control cabinet. There are buttons such as power start and stop, emergency stop, and power indicator light next to it. The touch screen communicates with the processor using a network cable.

[0066] In the embodiment of the present invention, the PLC control device can be implemented by a Siemens PLC controller. A control module is set in the PLC control device to control the automatic opening and closing of related valves. The embodiment of the present invention sets 10 function switching modes through software to realize different oil circuit structures and functions, which are as follows:

[0067] Oil inlet to oil tank (without oil filter), oil inlet to oil tank (with oil filter), sheet-dispersed flushing, sheet-dispersed backwashing, sheet-dispersed flushing (with external oil filter), sheet-dispersed backwashing (with external oil filter), pipeline flushing, pipeline flushing (with external oil filter), pipeline backwashing, sheet-dispersed oil unloading. The following is a brief description of different oil circuit structures and functions:

[0068] 1. Wash the slices

[0069] Select the corresponding mode and the voltage level of the project. Different voltage levels have different requirements for the particle size of transformer oil, that is, different cleanliness indicators for qualified flushing, that is, different oil index parameter requirements. The operator opens and confirms that the manual and automatic valves are opened correctly according to the flow chart, and then presses the start button. The system runs automatically, and the online monitoring particle size meter displays the measured value in real time. After reaching the required standard, it will be stable for 5 minutes and then automatically shut down.

[0070] This flushing mode uses the large flow oil pump of the equipment to perform power flushing on the heat exchanger from top to bottom, and flushes the heat exchanger through the three-stage filtration mode of the first-stage coarse filter and the second-stage fine filter, and removes the internal impurities into the filter bag. Simulating the actual heat exchanger operation mode of the transformer product, the transformer oil enters the heat exchanger from the upper confluence mother pipe through the branch pipe, flows out from the bottom and converges to the lower mother pipe, and then flows back to the transformer. The hot oil in the transformer rises and flows into the heat exchanger from the top again, so that the oil circulates continuously between the heat exchanger and the transformer.

[0071] In the embodiment of the present invention, there is a detection connecting pipe at the outlet of the lower connecting pipe where the flushing is completed. The detection probe of the online monitoring particle size analyzer penetrates into the flowing transformer oil through the connecting pipe to automatically detect the particle size.

[0072] 2. Flake washing (external oil filter)

[0073] For projects with particularly high voltage levels or special requirements, this mode can be selected after the flakes are washed. Use an external vacuum oil filter for deep cleaning. After the online particle size monitoring is qualified, take the oil sample and send it to the laboratory for special inspection.

[0074] This flushing mode uses special high-precision equipment such as vacuum oil filter to perform dynamic flushing of the flakes from top to bottom, which not only meets the purification requirements, but also meets the requirements of pressure resistance and gas content. At this time, the oil pump and filter equipment of the flushing equipment are not enabled.

[0075] The flanges of the inlet and outlet hoses of the external vacuum oil filter are connected to the manual ball valve.

[0076] 3. Flake recoil

[0077] To prevent the bottom impurities from being easily removed during forward flushing, select this mode for reverse flushing. The rest of the operations are the same as 1.

[0078] This flushing mode uses the equipment's high-flow oil pump to perform power flushing on the flakes from bottom to top, which is opposite to the flow direction in actual use. The purpose is to stir up the impurities that may be attached to the bottom after forward flushing through reverse flow, and then clean the flakes through a three-stage filtration mode of a first-stage coarse filter and a two-stage fine filter to remove internal impurities into the filter bag.

[0079] 4. Flake backwash (external oil filter)

[0080] Select the corresponding mode and use the external vacuum oil filter to perform deep cleaning. The rest of the operations are the same as 2.

[0081] This flushing mode uses vacuum oil filter and other special high-precision equipment to perform reverse power flushing from bottom to top on the flakes, stirring and cleaning the impurities deposited at the bottom, which not only meets the purification requirements, but also meets the requirements of pressure resistance and gas content. At this time, the oil pump and filter equipment of the flushing equipment are not enabled.

[0082] 5. Oil leakage

[0083] After the flakes are flushed, this mode is used to quickly drain the oil with an oil pump. Select the corresponding mode, and the operator opens and confirms that the manual and automatic valves are opened correctly according to the flow chart, and then presses the start button. The system runs automatically. The electric valve at the top of the main connecting pipe on the upper part of the mounting bracket opens automatically, and the oil in the flakes is discharged from the upper part into the oil tank through the outlet coarse and fine two-stage filter by the oil pump.

[0084] 6. Pipeline flushing

[0085] In order to avoid secondary pollution caused by the mixing of different transformer oils or deposition in the pipeline, the pipelines and oil tanks of the device should be cleaned regularly and in special circumstances. Open the upper valve of the riser, close the upper and lower interface valves of the scattered film, and start the large-flow oil pump to quickly circulate the transformer oil in the pipeline of the device body and filter it through the three-stage filter. After the online particle size monitoring is qualified, take the oil sample and send it to the laboratory for special inspection.

[0086] 7. Pipeline flushing (external filter)

[0087] For projects with particularly high voltage levels, poor transformer oil quality, or special requirements, select this mode for deep cleaning.

[0088] 8. Pipeline backwash

[0089] To prevent the impurities at the bottom from falling off during forward flushing, select this mode for reverse flushing. The rest of the operations are the same as 7.

[0090] There are two situations for oil inlet to the oil storage tank, one is the oil that has been filtered and qualified, and the other is the crude oil to be processed or unqualified oil. For qualified oil, select the oil tank inlet (no oil filter) mode on the workbench. The process flow is to connect the oil outlet of the transport oil tank with the oil pump front oil inlet of this device, manually open the valve according to the flow chart, and the electric valve D04 automatically opens. After the operator confirms that the valve is opened correctly, press the start button, the oil pump automatically starts, and the oil enters from the top of the oil tank. When the oil level reaches the set level, the magnetic flap level gauge sends a signal, automatically stops the pump, and the electric valve automatically closes. Close the corresponding valve manually, remove the connecting hose, and complete the oil filling work.

[0091] For unqualified oil, select the oil tank oil inlet (oil filter) mode. The process flow adds two levels of filtration compared to the non-filtered oil mode. The electric valve opens automatically. After the operator confirms that the manual and electric valves are opened correctly, press the start button, the oil pump automatically starts, and the transformer oil passes through the coarse filter and the fine filter and enters the oil tank from the top. Take an oil sample from the tank for testing. If it is qualified, keep it for use. If it is unqualified, start the pipeline flushing mode, and choose whether to connect the oil filter according to the oil sample index and project requirements, and filter the oil until it is qualified.

[0092] When the touch screen of the integrated control cabinet is switched to a certain oil circuit structure and function, the LCD screen displays the corresponding control valve and pipeline structure diagram, and the corresponding electric valve is opened, and other electric valves are closed. The corresponding valve light on the display will light up to prompt the operator which manual valves and electric valve status to open and close. The opening and closing status of the electric valve is set by the program, and the manual valve can open and close the corresponding manual valve according to the prompt.

[0093] In short, when switching to a certain oil circuit structure and function, the LCD screen displays the corresponding pipeline schematic diagram, and controls the corresponding electric valve to open or close through circuit connection to form the corresponding pipeline and realize the required function.

[0094] After switching to the oil circuit structure and function, the LCD screen displays three states: "Start", "Stop" and "Emergency Stop". "Start" means the oil pump starts working; "Stop" means the oil pump stops working; "Emergency Stop" means the oil pump stops working and all valves are closed.

[0095] In the embodiment of the present invention, the control module of the PLC control device is set with two permissions, the operator has read-only permission and the programmer has editing permission.

[0096] In the embodiment of the present invention, when the transformer pieces are fully automatically flushed, the piece stand device, piece mounting bracket, movable operating table, oil storage tank, filtering device, large-flow flushing oil pump, piece fully automatic flushing pipeline system, online automatic particle size detection device, automatic control system, workbench, transformer oil testing device, matching vacuum oil filter and large-flow flushing equipment are combined into a complete operating system. The pieces are hung on the stand, the bottom laminated wooden pad is in place, and the supports on both sides are installed in place. The bottom of the piece is connected to the main connecting pipe at the bottom of the mounting bracket, and the upper part stands on the movable operating platform and is connected to the corresponding pipe mouth of the vertical pipe of the mounting bracket. If it exceeds the existing specifications, it can be connected with a hose, but the upper hanging climbing of the piece and the hook on the main connecting pipe of the mounting bracket need to be connected with a sling to avoid displacement of the piece caused by oil impact.

[0097] The present invention is applied to the automatic flushing of transformer pieces, which can realize the automatic flushing and effect monitoring, and can qualitatively analyze the flushing quality of the piece manufacturers as a purchase inspection. In addition, when the present invention is implemented, the integrated machine control cabinet can be connected to the company's data platform and transmit data.

[0098] A fully automatic flushing method for transformer fragments comprises the following steps:

[0099] Step 1. Select the control function required for flake flushing, check whether the opening or closing status of the relevant valves is correct, and click the start button;

[0100] like Figure 5 FIG. 1 is a logic block diagram of the steps in the preparation stage for the start of film washing according to an embodiment of the present invention; the steps specifically include the following steps:

[0101] S1.1. Turn on the power and enter the control display interface;

[0102] S1.2. Select the project type for flake washing;

[0103] S1.3. Check whether the manual valve is open according to the prompt. If not, open the manual valve.

[0104] S1.4. Check whether the manual valve to be closed is closed according to the prompt. If not, close the manual valve;

[0105] S1.5. Input the required flushing time and set the end particle size condition;

[0106] S1.6. Click the start button to start washing.

[0107] Step 2: The electric valve and the electric ball valve start to execute according to the preset pipeline, the oil pump motor is started, and the timing of the sheet flushing begins;

[0108] like Figure 6FIG. 1 is a logic block diagram of the steps of the preparation phase of the film-dispersed washing timing according to an embodiment of the present invention; the steps specifically include the following steps:

[0109] S2.1, electric valves and electric ball valves start to operate according to the preset pipelines;

[0110] S2.2, determine whether the electric valve and the electric ball valve have reached the corresponding switch position, if yes, go to the next step, if no, go to step S2.2;

[0111] S2.3, reset the flow interruption judgment logic; there is a flow interruption indicator in the oil pump outlet pipeline, which is connected to the oil pump motor start and close control system. In principle, when there is oil flow, it will impact the impeller in the pipeline. When there is no oil flow, that is, the motor rotates but there is no oil in the pipeline, the impeller will stop rotating and automatically stimulate an electrical signal to the oil pump control system. The oil pump automatically stops to avoid damage to the oil pump caused by long-term idling.

[0112] S2.4, start the oil pump motor;

[0113] S2.5, whether the flow cut-off signal can be judged, if yes, go to the next step, if not, go to step S2.5; that is, the flow cut-off in any situation will automatically protect the pump and stop, and the flow cut-off signal will be judged in real time and uninterruptedly as long as the oil pump starts running. Once the flow cut-off time exceeds the set value, the pump stop information will be sent to the oil pump control system.

[0114] S2.6. Start timing for washing the flakes.

[0115] Step 3: Determine whether the timing time is up, whether the particle size meets the requirements, whether the flow is cut off, whether it is ended manually, whether the oil sample is tested, and finally turn off the oil pump motor, turn off the automatic control, and generate a fragment flushing report.

[0116] like Figure 7 FIG. 1 is a logic block diagram of the steps of the film-dispersed washing process according to an embodiment of the present invention; the steps specifically include the following steps:

[0117] S3.1, determine whether the timing time is up, if yes, prompt timeout shutdown, go to step S3.5, if no, go to the next step;

[0118] S3.2, determine whether the particle size meets the requirements, if yes, prompt the particle size is qualified, and go to step S3.5, if not, go to the next step;

[0119] S3.3, determine whether the flow is interrupted, if yes, alarm for interruption and go to step S3.5, if no, go to the next step;

[0120] S3.4, determine whether it is manually ended, if yes, go to the next step, if not, go to step S3.1;

[0121] S3.5, determine whether to conduct oil sample testing, if yes, go to the next step, if no, go to step S3.7;

[0122] S3.6, take samples and send them for inspection, then go to the next step. After the laboratory test, go to step S3.9;

[0123] S3.7, turn off the oil pump motor;

[0124] S3.8, turn off automatic control;

[0125] S3.9. Generate a fragment flushing report.

[0126] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A fully automatic flushing method for transformer fragments, using a fully automatic flushing device, characterized in that: The fully automatic flushing device includes: an integrated machine control cabinet equipped with a touch screen and a PLC control device, and a flushing pipeline for connecting the oil storage tank and the sheet disperser, the flushing pipeline is composed of an oil pump for driving the oil to flow in the pipeline, and an electric valve, an electric ball valve, a manual ball valve, a manual butterfly valve, a coarse filter, and a fine filter, the electric valve and the electric ball valve are electrically connected to the PLC control device through cable accessories; the PLC control device is provided with a control module for controlling the opening and closing of the electric valve and the electric ball valve; the touch screen is used to display the opening and closing requirements of the manual valve corresponding to the control process, and the user selects the corresponding flushing mode through the touch screen; The flushing pipeline includes: the first pipeline - the sheet-dispersed flushing oil inlet pipeline, which is used to pump the transformer oil in the oil storage tank through the fine filter and then pump it into each sheet-dispersed to flush the impurities in the sheet-dispersed. The first pipeline - the sheet-dispersed flushing oil inlet pipeline includes the oil storage tank - oil sampling device - manual butterfly valve - electric valve - manual butterfly valve - oil pump - manual butterfly valve - fine filter - manual butterfly valve - electric valve - oil sampling device - upper mother pipe - each branch riser - each sheet-dispersed inlet manual butterfly valve - each sheet-dispersed outlet manual butterfly valve - lower mother pipe - oil discharge pipeline connected in sequence; the second pipeline - the sheet-dispersed flushing oil return pipeline, which is used to The transformer oil after washing the flakes is filtered through a coarse filter and a fine filter, and the impurities are left in the filter bag. The impurities in the filter bag are weighed as evidence of the washing quality of the flake manufacturer, so as to achieve the purpose of incoming inspection. The purified transformer oil is circulated for the next round of washing. The second pipeline - the flake washing return oil pipeline includes an oil discharge pipeline manual butterfly valve - a particle size online monitor - an oil sampling device - an electric valve - a manual butterfly valve - a coarse filter - a manual butterfly valve - a fine filter - an electric valve - a manual butterfly valve - an oil storage tank connected in sequence; the third pipeline - the flake oil discharge pipeline is used to quickly discharge the flakes through the power of the oil unloading pump. The residual oil in the bulk is filtered and purified at two stages before entering the oil storage tank for recycling, and no oil pollution is caused to the environment when the bulk is disassembled. The third pipeline - the bulk oil drain pipeline includes an upper mother pipe - an exhaust pipe - an electric ball valve - a manual ball valve - an upper mother pipe - each branch riser - each bulk inlet manual butterfly valve - each bulk outlet manual butterfly valve - a lower mother pipe - an oil discharge pipeline manual butterfly valve - an online particle size monitor - an oil sampling device - an electric valve - a manual butterfly valve - a coarse filter - a manual butterfly valve - a fine filter - an electric valve - a manual butterfly valve - an oil pump - a manual butterfly valve - an electric valve - a manual butterfly valve - an oil storage tank; the fourth pipeline - External oil filter flushing pipeline, used for deep cleaning of ultra-high voltage transformers, deep cleaning of the loose pieces with a vacuum oil filter, no longer starting the oil pump and its own filter, the fourth pipeline - external oil filter flushing pipeline, including sequentially connected oil storage tank - oil sampling device - manual butterfly valve - electric valve - manual ball valve - oil filter - oil sampling device - upper mother pipe - each branch riser - each loose piece inlet manual butterfly valve - each loose piece outlet manual butterfly valve - lower mother pipe - oil discharge pipeline - particle size online monitor - oil sampling device - manual ball valve - hose - manual ball valve - electric valve - manual butterfly valve - oil storage tank; The particle size online monitor is installed in the outlet pipeline of the lower mother pipe, and is used to display the particle size value of the transformer oil in the pipeline in real time, and automatically store it in the control system; the oil sampling device is used to take oil samples for ultra-high voltage products to test the withstand voltage and water content of transformer oil test indicators; The control components are divided into a high-voltage wiring board and a human-machine interface. The high-voltage wiring board is fixed inside the integrated machine control cabinet. The human-machine interface is a Siemens 7-inch touch screen, which is fixed at the front of the integrated machine control cabinet. There are power start and stop buttons, as well as emergency stop and power indicator buttons next to it. The touch screen communicates with the processor using a network cable. A control module is set in the PLC control device to control the automatic opening and closing of related electric valves and electric ball valves, and 10 function switching modes are set to realize different oil circuit structures and functions, as follows: oil inlet from oil tank-no oil filtering, oil inlet from oil tank-oil filtering, sheet-dispersed flushing, sheet-dispersed backwashing, sheet-dispersed flushing-external oil filter, sheet-dispersed backwashing-external oil filter, pipeline flushing, pipeline flushing-external oil filter, pipeline backwashing, and sheet-dispersed oil unloading; The following steps are involved: Step 1. Select the control function required for flake flushing, check whether the opening or closing status of the relevant valves is correct, and click the start button; S1.

1. Turn on the power and enter the control display interface; S1.

2. Select the project type required for flake washing; S1.

3. Check whether the manual valve is open according to the prompt. If not, open the manual valve. S1.

4. Check whether the manual valve to be closed is closed according to the prompt. If not, close the manual valve; S1.

5. Input the required flushing time and set the end particle size condition; S1.

6. Click the start button to start washing; Step 2: The electric valve and the electric ball valve start to execute according to the preset pipeline, the oil pump motor is started, and the timing of the sheet flushing begins; S2.1, electric valves and electric ball valves start to operate according to the preset pipelines; S2.2, determine whether the electric valve and the electric ball valve have reached the corresponding switch position, if yes, go to the next step, if no, go to step S2.2; S2.3, reset the flow cut-off judgment logic: there is a flow cut-off indicator in the oil pump outlet pipeline, which is connected to the oil pump motor start-stop control system. When there is oil flow, it impacts the runner in the pipeline. When there is no oil flow, the runner stops rotating and automatically stimulates an electrical signal to the oil pump control system; S2.4, start the oil pump motor; S2.5, whether the flow interruption signal can be determined, if yes, go to the next step, if no, go to step S2.5; S2.6, start timing for washing the flakes; Step 3: Determine whether the timing time is up, whether the particle size meets the requirements, whether the flow is cut off, whether it is manually ended, whether the oil sample is tested, and finally turn off the oil pump motor, turn off the automatic control, and form a flake flushing report; S3.1, determine whether the timing time is up, if yes, prompt timeout shutdown, go to step S3.5, if no, go to the next step; S3.2, determine whether the particle size meets the requirements, if yes, prompt the particle size is qualified, and go to step S3.5, if not, go to the next step; S3.3, determine whether the flow is interrupted, if yes, alarm for interruption and go to step S3.5, if no, go to the next step; S3.4, determine whether it is manually ended, if yes, go to the next step, if not, go to step S3.1; S3.5, determine whether to perform oil sample testing, if yes, go to the next step, if no, go to step S3.7; S3.6, take samples and send them for inspection, then go to the next step. After the laboratory test, go to step S3.9; S3.7, turn off the oil pump motor; S3.8, turn off automatic control; S3.9, generate a fragment flushing report; The flushing time is automatically adjusted according to the cleanliness of the transformer oil through the online particle size monitor.

2. The fully automatic flushing method for transformer fragments according to claim 1 is characterized in that: The PLC control device is implemented using a Siemens PLC controller.

3. The fully automatic flushing method for transformer fragments according to claim 2 is characterized in that: The three-phase four-wire system is used as the total input power supply, the switching power supply is used to provide the circuit with 24V DC power supply, and the Siemens PLC controller is used as the central processor to collect external related signals and drive the intermediate relay. The intermediate relay contacts are used to drive the corresponding electric valves, electric ball valves and actuators to meet the flushing requirements.

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