Micro-momentum zero-point self-correcting temperature measuring device and temperature controller applying same

Abstract

The invention discloses a micro-momentum zero-point self-correcting temperature measuring device and a temperature controller applying the same, and relates to the technical field of transformers, the micro-momentum zero-point self-correcting temperature measuring device comprises a multifunctional dispatching seat which is inserted into a box body of a transformer, a structural cavity is arranged in an insertion part, and a surrounding dispatching cavity is arranged outside the structural cavity; the temperature bulb is inserted into the structural cavity; the temperature response module is connected to the temperature bulb and outputs temperature information based on the change of the temperature bulb at the temperature; the high-heat-conduction medium circulating mechanism is used for driving a pre-prepared high-heat-conduction medium to enter and exit from the structural cavity and the dispatching cavity; the low-heat-conduction medium circulating mechanism is used for driving a pre-prepared low-heat-conduction medium to enter and exit from the structural cavity; the active temperature regulation module is used for carrying out active temperature regulation on the high-heat-conduction medium; the temperature response module comprises a control unit, and the control unit is electrically connected to the high-heat-conduction medium circulating mechanism, the low-heat-conduction medium circulating mechanism and the active temperature adjusting module. The transformer winding temperature monitoring method has the effect of improving the accuracy of transformer winding temperature monitoring.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a micro-motion zero-point self-correction temperature measuring device and a temperature controller using the same. Background Art

[0002] Transformers are essential infrastructure for power transmission and distribution, providing key functions such as voltage conversion, isolation, and voltage regulation. To improve transformer safety, composite sensing technology is currently being used to monitor transformer winding temperature, enabling timely control of cooling system start / stop, high-temperature alarms, and over-temperature tripping.

[0003] An existing composite sensing technology, the corresponding equipment mainly includes components such as a temperature bulb, a capillary tube, an elastic element, a monitoring module (such as a current transformer), an electric heating element and a current transformer.

[0004] The above-mentioned temperature bulb is placed in the oil near the transformer winding. When the temperature bulb senses temperature, the volume of the temperature-sensing medium in the bulb changes accordingly. The change is transferred to the elastic element through the capillary tube, causing the elastic element to displace. The displacement analysis indicates the measured temperature, that is, the oil temperature. When the transformer load changes, the current proportional to the load is taken out through the current transformer. After the built-in converter adjusts the corresponding data, it is input to the electric heating element. The heat generated by the electric heating element is:

[0005] In one case, the temperature bulb is reheated to cause an additional displacement of the elastic element, which generates a temperature indication value that is one temperature difference higher than the oil temperature, i.e., the transformer winding temperature;

[0006] In another case, the elastic element in the drive unit generates an additional displacement, which generates a temperature indication value that is one temperature difference higher than the oil temperature, namely, the transformer winding temperature.

[0007] The above method for obtaining the transformer winding temperature is provided. However, the core of the above solution is the displacement of the elastic element, which leads to the following problems:

[0008] If the elastic element is initially offset or deformed due to production or installation, or if the elastic element cannot return to its original position after long-term use, the obtained transformer winding temperature will actually be offset, resulting in misjudgment when used on the transformer, affecting the use effect. Therefore, this application proposes a new technical solution. Summary of the Invention

[0009] In order to improve the accuracy of transformer winding temperature monitoring and reduce transformer system misjudgment, the present application provides a micro-momentum zero-point self-correction temperature measurement device and a temperature controller using the same.

[0010] This application provides a micro-motion zero-point self-correction temperature measurement device, which adopts the following technical solutions:

[0011] A micro-motion zero-point self-correction temperature measuring device, comprising:

[0012] A multifunctional dispatching seat is inserted into the transformer box and has a structural cavity in the insertion portion and a surrounding dispatching cavity outside the structural cavity;

[0013] a temperature bulb, which is inserted into the structural cavity;

[0014] a temperature response module connected to the temperature bulb and outputting temperature information based on changes in the temperature of the temperature bulb;

[0015] A high thermal conductivity medium circulation mechanism, which is used to drive the pre-prepared high thermal conductivity medium into and out of the structural cavity and the dispatching cavity;

[0016] A low thermal conductivity medium circulation mechanism, which is used to drive the pre-prepared low thermal conductivity medium into and out of the structural cavity;

[0017] Active temperature control module, which is used to actively adjust the temperature of high thermal conductivity media;

[0018] The temperature response module includes a control unit, which is electrically connected to the high thermal conductivity medium circulation mechanism, the low thermal conductivity medium circulation mechanism and the active temperature control module. The control unit is configured to: be provided with a transformer winding temperature monitoring mode and a micro-momentum zero point correction mode;

[0019] If the current mode is transformer winding temperature monitoring mode, the high thermal conductivity medium circulation mechanism is controlled to fill the structural cavity and the scheduling cavity with the high thermal conductivity medium;

[0020] If the current mode is micro-motion zero point correction, the high thermal conductivity medium circulation mechanism is controlled to extract the high thermal conductivity medium from the scheduling cavity, so that the high thermal conductivity medium circulates in and out of the structural cavity, and the active temperature control module is controlled to increase and decrease the temperature of the high thermal conductivity medium and adjust it to the preset correction reference temperature; and the low thermal conductivity medium circulation mechanism is controlled to fill the scheduling cavity with low thermal conductivity medium until the temperature of the circulating high thermal conductivity medium stabilizes and the current temperature information is taken for zero point correction.

[0021] Optionally, the structural cavity is provided with a structural entrance and a structural exit at the portion where the multifunctional dispatching seat extends out of the transformer, and the dispatching cavity is provided with a dispatching entrance and a dispatching exit at the portion where the multifunctional dispatching seat extends out of the transformer;

[0022] The control unit includes a controller, a five-way pipe and a four-way pipe;

[0023] Each end of the five-way pipe is respectively installed with an electric valve A1, an electric valve A2, an electric valve A3, an electric valve A4 and an electric valve A5 electrically connected to the controller, and the electric valve A1 is connected to the output port of the high thermal conductivity medium circulation mechanism, the electric valve A3 is connected to the dispatching inlet, and the electric valve A5 is connected to the structure inlet; the electric valve A2 is connected to the output port of the low thermal conductivity medium circulation mechanism, and the electric valve A4 is connected to the atmosphere;

[0024] Each end of the four-way pipe is respectively installed with an electric valve B1, electric valve B2, electric valve B3 and electric valve B4 electrically connected to the controller, and the electric valve B1 is connected to the structural outlet, the electric valve B3 is connected to the input port of the high thermal conductivity medium circulation mechanism; the electric valve B2 is connected to the scheduling outlet, and the electric valve B4 is connected to the input port of the low thermal conductivity medium circulation mechanism.

[0025] Optionally, the active temperature control module includes a heat exchanger and a temperature sensor, and the high thermal conductivity medium circulation mechanism includes a storage tank and pump 1, the output port of pump 1 is connected to the input port of the heat exchanger, the output port of the heat exchanger is connected to the storage tank, and the storage tank is also connected to the electric valve A1 through a pipeline; the input port of pump 1 is connected to the electric valve B3;

[0026] The temperature sensor is detachably connected to the input port of the heat exchanger.

[0027] Optionally, the step of taking current temperature information and performing zero point correction until the temperature of the circulating high thermal conductivity medium stabilizes includes:

[0028] If the difference between the temperature detection value fed back by the temperature sensor and the calibration reference temperature is less than the preset allowable error, it is determined that the current temperature of the high thermal conductivity medium is stable;

[0029] Get the temperature information generated by the temperature package;

[0030] Calculate the difference between the temperature information and the temperature detection value fed back by the temperature sensor as a correction value;

[0031] The correction value is used to reset the zero point of the process of the controller generating temperature information or to add the correction value to the new temperature information.

[0032] Optionally, the low thermal conductivity medium circulation mechanism includes a buffer tank and a second pump, the upper part of the buffer tank is connected to the electric valve A2 and the lower part is connected to the output port of the second pump, the input port of the second pump is connected to the electric valve B4, and a pressure relief valve is installed on the upper part of the buffer tank, and the pressure relief valve is electrically connected to the control unit;

[0033] The low thermal conductivity medium is in a gaseous state. The low thermal conductivity medium circulation mechanism is controlled to fill the scheduling cavity with the low thermal conductivity medium, which includes:

[0034] The electric valves A2, A4, A5, B2 and B4 are opened, and the pump 2 is turned on. After maintaining the preset clearance time t1, the electric valves A2, A4, A5, B2 and B4 are closed, and the pump 2 is turned off.

[0035] Optionally, a one-way valve is installed on the pipeline connecting the buffer tank to the electric valve A2, the conduction direction of the one-way valve is toward the electric valve A2, the pipeline between the one-way valve and the electric valve A2 is connected to a branch pipe, the branch pipe is installed with a solenoid valve, and the branch pipe is connected to the gas source;

[0036] The control of the low thermal conductivity medium circulation mechanism to fill the scheduling chamber with low thermal conductivity medium also includes: first closing the electric valve A4 after the clearance time t1, opening the solenoid valve, maintaining the preset filling time t2, then closing the solenoid valve, closing the electric valves A2, A5, B2 and B4, and shutting down the second pump.

[0037] Optionally, a vertical lifting mechanism is installed in the buffer tank, and a floating tube is connected to the inner side of the input port of the buffer tank with a hose. The floating tube is fixed to the lifting part of the lifting mechanism. The lifting mechanism is electrically connected to the controller. The controller is configured to: if the electric valve A2 is opened, the lifting mechanism is controlled to pull the floating tube out of the liquid in the buffer tank.

[0038] Optionally, the bottoms of the storage tank and the buffer tank are connected by a pipe and a circulation pump is installed on the pipe. The circulation pump is electrically connected to the controller. The controller is configured to control the circulation pump to pump the medium from the buffer tank to the storage tank if the current equipment conditions meet the preset reflux conditions.

[0039] Optionally, a temperature measuring transition pipe is installed at the input port of the heat exchanger, the electric valve B3 is connected to the temperature measuring transition pipe, a detection window is provided at the beginning of the temperature measuring transition pipe, the detection window is threadedly connected to the mounting seat, and the temperature sensor penetrates the mounting seat.

[0040] In a second aspect, the present application provides a thermostat, which adopts the following technical solution:

[0041] A temperature controller is provided, which is installed on a transformer using the micro-motion zero-point self-correction temperature measuring device as described above, and is electrically connected to a monitoring system of the transformer.

[0042] In summary, the present application includes the following beneficial technical effects: first, the scheduling cavity is filled with a low thermal conductivity medium to relatively isolate and hinder the heat transfer between the structural cavity and the transformer oil, and then the temperature of the structural cavity is actively reduced (generally reduced) to the calibration reference temperature by continuously circulating and exchanging a high thermal conductivity medium, and the temperature response module of the temperature package is temperature-calibrated, reset or zeroed; because the present application can be directly applied to the transformer, there is no need to frequently disassemble and assemble the temperature package and the corresponding elastic element structure, etc., and the temperature measurement results of the winding temperature composite sensing detection technology can be corrected during the operation of the transformer, which can reduce errors caused by abnormalities such as elastic elements, so it is easy to use and can effectively improve the accuracy of transformer winding temperature monitoring and reduce the chance of misjudgment of the transformer system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of this application;

[0044] Figure 2 It is a structural diagram of other components of this combined temperature package;

[0045] Figure 3 It is a schematic diagram of the control structure of this application.

[0046] Explanation of the accompanying symbols: 1. Multi-functional dispatching seat; 11. Structural cavity; 12. Dispatching cavity; 2. Temperature bulb; 31. Capillary; 32. Structural body; 33. Elastic part; 34. Displacement sensing unit; 35. Current transformer; 36. Electric heating element; 41. Controller; 42. Five-way pipe; 43. Four-way pipe; 51. Heat exchanger; 52. Temperature sensor; 61. Storage tank; 62. Pump 1; 71. Buffer tank; 72. Pump 2; 73. One-way valve; 74. Solenoid valve; 8. Lifting mechanism; 81. Float tube; 9. Circulation pump. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0048] The embodiment of the present application discloses a micro-motion zero-point self-correction temperature measurement device.

[0049] Reference Figure 1 、 Figure 2 and Figure 3 The micro-motion zero-point self-correction temperature measurement device includes a multifunctional scheduling seat 1, a temperature package 2, a temperature response module, a high thermal conductivity medium circulation mechanism, a low thermal conductivity medium circulation mechanism and an active temperature adjustment module. Among them, the temperature response module includes a control unit and other components. The other components refer to the components that cooperate with the temperature package to monitor the temperature of the transformer winding. It is a prior art. The following is an exemplary description of the other components:

[0050] A capillary tube 31 is mounted on and connected to the temperature bulb 2;

[0051] The structure 32, which serves as the temperature-sensing displacement integrated body, is provided with a temperature-sensing cavity;

[0052] The elastic member 33 (diaphragm) separates the temperature sensing chamber into a first chamber and a second chamber, and the first chamber is connected to the capillary tube 31;

[0053] The displacement sensing (amplification) unit 34 senses the displacement of the elastic member 33 and can be a pressure sensing structure, a laser ranging structure, a force sensitive resistor, and a peripheral sampling and amplification circuit, etc., which can sense displacement changes. It can be understood that a one-to-one data relationship between displacement and temperature is pre-established;

[0054] a current transformer 35, which is installed on the transformer line to measure the load current of the transformer;

[0055] The electric heating element 36 can be a structure used to secondary heat the temperature bulb 2 or heat the temperature sensing medium in the temperature bulb 2, for example, a heating wire located outside the first chamber, so that the control unit controls the corresponding current (power) to be supplied to the electric heating element 36 after conversion by a current transformer according to a preset rule (such as proportion) based on the feedback from the current transformer 35, thereby generating additional heat and causing the elastic member 33 to produce additional displacement, so as to obtain the transformer winding temperature.

[0056] The above briefly describes how the temperature bulb 2 is combined with the temperature response module to obtain the transformer winding temperature. The following is an explanation of the main contents of this application:

[0057] The multifunctional dispatching seat 1 is columnar, and can be vertically inserted into the transformer with only the upper end placed outside the transformer; a structural cavity 11 is provided inside the multifunctional dispatching seat 1, and a dispatching cavity 12 is surrounded by the outer ring of the inner wall. It should be noted that the dispatching cavity 12 does not cover the top of the structural cavity 11, so the multifunctional dispatching seat 1 can be a double-layer structure, with the outer layer being sleeved on the outside of the inner layer, and the outer wall of the inner layer is fixed with an insulating isolation block to isolate the inside and outside to form a dispatching cavity 12. The inner cavity of the inner layer is the above-mentioned structural cavity 11, and the temperature bag 2 is inserted into the structural cavity 11.

[0058] It can be understood that the setting of the above-mentioned multifunctional dispatching seat 1 will result in the top openings of the structural cavity 11 and the dispatching cavity 12, so the top cover should also be fixed to close the openings; at the same time, because it is necessary to cooperate with the high thermal conductivity medium circulation mechanism and the low thermal conductivity medium circulation mechanism, a structural inlet and a structural outlet are opened on the top cover to connect to the structural cavity 11, and a dispatching inlet and a dispatching outlet are also opened on the top cover to connect to the dispatching cavity 12.

[0059] The above-mentioned high thermal conductivity medium circulation mechanism is used to drive the pre-prepared high thermal conductivity medium into and out of the inner cavity and the scheduling cavity; the low thermal conductivity medium circulation mechanism is used to drive the pre-prepared low thermal conductivity medium into and out of the inner cavity; the active temperature control module is used to actively adjust the temperature of the high thermal conductivity medium.

[0060] The control unit is electrically connected to the high thermal conductivity medium circulation mechanism, the low thermal conductivity medium circulation mechanism and the active temperature control module. The control unit is configured to: be provided with a transformer winding temperature monitoring mode (i.e., working mode) and a micro-motion zero point correction mode (i.e., self-correction mode);

[0061] If the current mode is transformer winding temperature monitoring mode, for example, the machine time indicates that the current time is not the preset correction activation period, the high thermal conductivity medium circulation mechanism is controlled to fill the structural cavity 11 and the scheduling cavity with high thermal conductivity medium to prevent the temperature bag 2 from timely sensing the temperature change of the transformer oil and detecting and analyzing the transformer winding temperature.

[0062] If the current mode is the micro-motion zero point calibration mode, for example, the machine time indicates that the current time is the preset calibration activation period, the high thermal conductivity medium circulation mechanism is controlled to extract the high thermal conductivity medium from the scheduling chamber 12, so that the high thermal conductivity medium circulates in and out of the structural chamber, and the active temperature control module is controlled to raise and lower the temperature of the high thermal conductivity medium and adjust it to the preset calibration reference temperature; and the low thermal conductivity medium circulation mechanism is controlled to fill the scheduling chamber 12 with low thermal conductivity medium;

[0063] Until the temperature of the circulating high thermal conductivity medium stabilizes, the current temperature information is taken for zero point correction.

[0064] That is, first fill the dispatching cavity 12 with a low thermal conductivity medium to relatively isolate and hinder the heat transfer between the structural cavity 11 and the transformer oil, and then use the high thermal conductivity medium to continuously circulate and exchange heat to actively reduce the temperature of the structural cavity 11 (generally to reduce it) to the calibration reference temperature, and perform temperature correction, reset or zeroing on the temperature response module of the temperature package 2;

[0065] Because the present application can be directly applied to the transformer, there is no need to frequently disassemble and assemble the temperature bag 2 and the corresponding elastic element structure, etc., and the temperature measurement results of the winding temperature composite sensing detection technology can be corrected during the operation of the transformer, which can reduce the errors caused by abnormalities such as elastic elements. Therefore, it is easy to use and can effectively improve the accuracy of transformer winding temperature monitoring and reduce the chance of misjudgment of the transformer system.

[0066] It can be understood that the high and low of high thermal conductivity medium and low thermal conductivity medium are the result of comparison between the two. Water can be used as high thermal conductivity medium because it is relatively cheap; if safety in the transformer environment is considered, oil can also be used; and air can be used as low thermal conductivity medium. Dry air is preferred, so a dehumidification unit should be added to the air inlet part; carbon dioxide, inert gas, etc. can also be used as low thermal conductivity medium. At this time, a gas source should be selected, such as a gas tank or a gas source generator.

[0067] In one embodiment of the present application, the control unit includes a controller 41, a five-way tube 42 and a four-way tube 43, wherein the circuit board corresponding to the controller 41 is integrated and installed in a box body or other structure for protection, and can be a small PLC controller, a single-chip microcomputer controller, etc.

[0068] The ends of the five-way pipe 42 are respectively equipped with electric valves A1, A2, A3, A4 and A5 electrically connected to the controller 41, and the electric valve A1 is connected to the output port of the high thermal conductivity medium circulation mechanism, the electric valve A3 is connected to the scheduling inlet, and the electric valve A5 is connected to the structure inlet; the electric valve A2 is connected to the output port of the low thermal conductivity medium circulation mechanism, and the electric valve A4 is connected to the atmosphere.

[0069] Each end of the four-way pipe 43 is respectively installed with an electric valve B1, an electric valve B2, an electric valve B3 and an electric valve B4 electrically connected to the controller 41, and the electric valve B1 is connected to the structural outlet, and the electric valve B3 is connected to the input port of the high thermal conductivity medium circulation mechanism; the electric valve B2 is connected to the scheduling outlet, and the electric valve B4 is connected to the input port of the low thermal conductivity medium circulation mechanism.

[0070] It is understandable that each of the above-mentioned electric valves can be a solenoid valve; the electric valves, four-way pipes and circulation mechanisms are connected by pipelines, and the multiple structures can be integrated in the box structure to be simpler and easier to maintain.

[0071] Example usage:

[0072] 1) Transformer winding temperature monitoring mode: the structural cavity 11 and the dispatching cavity 12 are filled with high thermal conductivity media, and all electric valves are closed;

[0073] 2) Micro-motion zero point correction mode: This will be explained later and will not be repeated here.

[0074] According to the above settings, when using this application, the logic and workflow are set up, and the controller 41 is used to control each electric valve to meet the usage requirements of the above two modes.

[0075] In another embodiment of the present application, the active temperature control module includes a heat exchanger 51 and a temperature sensor 52, and the high thermal conductivity medium circulation mechanism includes a storage tank 61 and a pump 62; it should be noted that the structural cavity 11 and the scheduling cavity 12 outside the temperature bag 2 of the present application are relatively small in volume, so the tank structure, pump structure, etc. are all small and micro equipment, rather than conventional medium and large equipment in the factory.

[0076] Among them, the heat exchanger 51 in this embodiment can be a water-cooled heat exchanger, whose cold water outlet is connected to the water source (water pump, local water supply facility) through a pipeline, and the hot water outlet is connected to the drainage system and water resource recovery facility through a pipeline. Its input port is connected to the output port of the pump 62 through a pipeline, and the output port is connected to the storage tank 61 through a pipeline. That is, the high thermal conductivity medium flowing through can be cooled by water cooling so that the temperature of the high thermal conductivity medium reaches the calibration reference temperature.

[0077] The reason why the storage tank 61 is needed is that the amount of high thermal conductivity medium used in different modes is different, so a container is needed to assist in the allocation and adaptation; a pressure balance valve can be installed on the top of the storage tank 61 to connect to the atmosphere, and the storage tank 61 cannot be filled, and can be at most 4 / 5 of the volume; the storage tank 61 is also connected to the electric valve A1 through a pipeline to deliver the high thermal conductivity medium into the scheduling chamber 12.

[0078] The input port of pump 1 62 is connected to the electric valve B3 through a pipeline, so:

[0079] 1) Open the electric valves A1, A3, B1, and B3, close the other electric valves, and start the pump 62 to allow the high thermal conductivity medium to continuously exchange heat and circulate in and out of the structural cavity 11, so as to lower the temperature of the structural cavity 11 and allow the temperature measured by the temperature bulb 2 to theoretically reach the calibration reference temperature;

[0080] If it cannot be reached, it means that the composite sensing technology based on the temperature bulb 2 is abnormal and needs to be calibrated, and the calibration and re-zeroing are performed based on the difference from the calibration reference temperature.

[0081] 2) Open the electric valves A1, A5, B2, and B3, close the other valves, and start the pump 62 to allow the high heat conductivity medium to enter the dispatching chamber 12, so that the temperature package 2 can sense the oil temperature in time.

[0082] In the above step 1), a temperature sensor 52 is required. The temperature sensor 52 is outside the transformer and can be detachably connected to the heat exchanger 51. It can be said that it is independent of the transformer, so it is more convenient for staff to maintain and inspect it to ensure its accuracy, and the transformer can even be inspected without shutting down. As long as the temperature sensor 52 is accurate, the temperature measurement of the transformer winding can automatically correct errors caused by abnormal elastic elements, etc.; and when correction is not required, the temperature sensor 52 can even be activated without powering on, and its service life is relatively longer.

[0083] The temperature sensor 52 is preferably a contact temperature sensor, that is, a temperature sensor inserted into a high thermal conductivity medium to detect the temperature. One has lower cost and the other has better stability.

[0084] It should be noted that, under the above setting, the temperature sensor 52 needs to be installed at the input port of the heat exchanger 51. Specifically: a temperature measuring transition pipe is installed at the input port of the heat exchanger 51, the electric valve B3 is connected to the temperature measuring transition pipe, the temperature measuring transition pipe has a detection window at the beginning, the detection window is threadedly connected to the mounting seat, the temperature sensor 52 is fixed through the mounting seat, and the temperature measuring transition pipe is extended from the detection window to contact the high thermal conductivity medium.

[0085] The advantages of the above arrangement are: first, the temperature sensor 52 is easy to remove for inspection; second, it can more promptly detect that the temperature in the structural cavity 11 has approached or reached the calibration reference temperature, thereby reducing hysteresis distortion.

[0086] In another embodiment of the present application, the control unit (i.e., the controller 41 ) performs zero-point correction by taking the current temperature information until the temperature of the circulating high thermal conductivity medium stabilizes, which includes:

[0087] If the difference between the temperature detection value fed back by the temperature sensor 52 and the calibration reference temperature is less than the preset allowable error, it is determined that the current temperature of the high thermal conductivity medium is stable, that is, it is considered that the structural cavity 11 is temporarily stable at a temperature suitable for calibration under active control.

[0088] Afterwards, the temperature information generated by the temperature bulb 2 is obtained, that is, the temperature information obtained by the aforementioned temperature response module;

[0089] Calculate the difference between the temperature information and the temperature detection value fed back by the temperature sensor 52 as a correction value;

[0090] The process of generating temperature information by the controller 41 is reset to zero point with the correction value or the correction value is added to the new temperature information; an example of resetting the zero point is to add the correction value to the current zero point to obtain a new zero point; an example of adding the correction value to the new temperature information is to add the correction value to any new temperature information to obtain the new temperature information as the true value.

[0091] According to the above settings, the winding temperature obtained based on the temperature bag 2 can be guaranteed to be relatively accurate; at the same time, by adding a five-way tube 42 and a four-way tube 43 and connecting them in parallel, the present application can be used to simultaneously and separately perform temperature correction on multiple winding temperature measurement designs based on the temperature bag 2 on different transformers and the same transformer.

[0092] In another embodiment of the present application, the low thermal conductivity medium circulation mechanism includes a buffer tank 71 and a pump 2 72. The upper part of the buffer tank 71 is connected to the electric valve A2 through a pipeline and the lower part is connected to the output port of the pump 2 72 through a pipeline. A pressure relief valve is also installed on the upper part of the buffer tank 71.

[0093] Control the low thermal conductivity medium circulation mechanism to fill the scheduling cavity 12 with low thermal conductivity medium, specifically:

[0094] The electric valves A2, A4, A5, B2 and B4 are opened, the other electric valves are closed, and the second pump 72 is opened to maintain the preset clearance time t1. During this stage, the second pump 72 extracts from the scheduling chamber 12, allowing the high heat conductivity medium and air remaining in the scheduling chamber 12 to enter the buffer tank 71.

[0095] According to the above arrangement, when the medium in the scheduling chamber 12 is switched, the medium remaining therein can be squeezed out and sent into the buffer tank 12 to avoid excessive contamination of the two mixed paths, which may pollute the medium with low thermal conductivity but higher and the medium with high thermal conductivity but lower; moreover, after the gas and liquid enter the buffer tank 71, the liquid remains in the tank and the gas floats up to continue circulating. Because the low thermal conductivity medium is in gaseous state, it will not excessively hinder the flow of the low thermal conductivity medium.

[0096] After maintaining the preset clearance time t1, the electric valves A2, A4, A5, B2 and B4 are closed, and the pump 2 72 is turned off; at this time, the scheduling chamber 12 is filled with air. If the low thermal conductivity medium is air, the basic requirements are met; if the low thermal conductivity medium is not air, other settings are required, which will be explained in detail later.

[0097] In another embodiment of the present application, a one-way valve 73 is installed on the pipeline connecting the buffer tank 71 to the electric valve A2. The conduction direction of the one-way valve 73 is toward the electric valve A2. The pipeline between the one-way valve 73 and the electric valve A2 is connected to a branch pipe, and an electromagnetic valve 74 is installed on the branch pipe, and the branch pipe is connected to the gas source; the gas source is, for example: the above-mentioned gas tank, gas source generator; at this time, the low thermal conductivity medium can be non-air such as inert gas.

[0098] Based on the above, the controller 41 controls the low thermal conductivity medium circulation mechanism to charge the scheduling cavity with the low thermal conductivity medium, which also includes:

[0099] After the emptying time t1, the electric valve A4 is closed first, and the electromagnetic valve 74 is opened. After the preset filling time t2, the electromagnetic valve 74 is closed, the electric valves A2, A5, B2 and B4 are closed, and the pump 2 72 is turned off.

[0100] According to the above configuration, the present application can use an air source to provide a low thermal conductivity medium, and can squeeze out the air in the scheduling cavity 12 to ensure the purity of the low thermal conductivity medium in the scheduling cavity 12.

[0101] In another embodiment of the present application, a lifting mechanism 8 is installed in the buffer tank 71. The lifting mechanism 8 can be an electric telescopic cylinder, which is fixed with a bracket and the telescopic rod is vertical; the base is fixed at the end of the telescopic rod, and the inner side of the input port of the buffer tank 71 is connected to the floating tube 81 with a hose, and the floating tube 81 is fixed to the end of the telescopic rod of the lifting mechanism 8; the lifting mechanism 8 is electrically connected to the controller 41.

[0102] The controller 41 is configured to control the lifting mechanism 8 to pull the floating tube 81 out of the liquid in the buffer tank 71 if the electric valve A2 is opened.

[0103] The above arrangement can reduce the probability of water vapor mixing into the low thermal conductivity medium filling the scheduling cavity 12, thereby reducing the interference of water vapor on the thermal insulation performance.

[0104] As to how to ensure that the floating tube 81 is separated from the liquid, the expansion and contraction amount may be preset, for example, the floating tube 81 is pulled to a position close to the upper part of the buffer tank 71 .

[0105] In another embodiment of the present application, the bottoms of the storage tank 61 and the buffer tank 71 are connected by a pipe and a circulation pump 9 is installed on the pipe. The circulation pump 9 is electrically connected to the controller 41. The controller 41 is configured as follows:

[0106] If the current equipment conditions meet the preset reflux conditions, for example, the number of corrections reaches the preset threshold, the circulation pump 9 is controlled to pump the medium from the buffer tank 71 to the storage tank 61, that is, the medium discharged into the buffer tank 71 in previous correction processes is sent back for reuse to increase the sustainable operation time of this application.

[0107] The embodiment of the present application discloses a thermostat.

[0108] The temperature controller is installed on a transformer using any of the micro-motion zero-point self-correction temperature measuring devices described above, and is electrically connected to the transformer's monitoring system.

[0109] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A micro-motion zero-point self-correction temperature measuring device, characterized in that: include: A multifunctional dispatching seat (1) is inserted into the transformer box and has a structural cavity (11) provided in the insertion portion, and a surrounding dispatching cavity (12) is provided outside the structural cavity (11); A temperature bulb (2) is inserted into the structural cavity (11); a temperature response module connected to the temperature bulb (2) and outputting temperature information based on a change in temperature of the temperature bulb (2); A high thermal conductivity medium circulation mechanism, which is used to drive the pre-prepared high thermal conductivity medium into and out of the structural cavity (11) and the dispatching cavity (12); A low thermal conductivity medium circulation mechanism, which is used to drive the pre-prepared low thermal conductivity medium into and out of the structural cavity (11); Active temperature control module, which is used to actively adjust the temperature of high thermal conductivity media; The temperature response module includes a control unit, which is electrically connected to the high thermal conductivity medium circulation mechanism, the low thermal conductivity medium circulation mechanism and the active temperature control module. The control unit is configured to: be provided with a transformer winding temperature monitoring mode and a micro-momentum zero point correction mode; If the current mode is transformer winding temperature monitoring mode, the high thermal conductivity medium circulation mechanism is controlled to fill the structural cavity (11) and the scheduling cavity (12) with the high thermal conductivity medium; If the current mode is the micro-motion zero point correction mode, the high thermal conductivity medium circulation mechanism is controlled to extract the high thermal conductivity medium from the scheduling cavity (12), so that the high thermal conductivity medium circulates in and out of the structural cavity (11), and the active temperature control module is controlled to increase and decrease the temperature of the high thermal conductivity medium and adjust it to a preset correction reference temperature; and the low thermal conductivity medium circulation mechanism is controlled to fill the scheduling cavity (12) with low thermal conductivity medium until the temperature of the circulating high thermal conductivity medium stabilizes and the current temperature information is taken for zero point correction.

2. The micro-motion zero-point self-correction temperature measuring device according to claim 1, characterized in that: The structural cavity (11) is provided with a structural inlet and a structural outlet at the position where the multifunctional dispatching seat (1) extends out of the transformer, and the dispatching cavity (12) is provided with a dispatching inlet and a dispatching outlet at the position where the multifunctional dispatching seat (1) extends out of the transformer; The control unit includes a controller (41), a five-way pipe (42) and a four-way pipe (43); Each end of the five-way pipe (42) is respectively installed with an electric valve A1, an electric valve A2, an electric valve A3, an electric valve A4 and an electric valve A5 electrically connected to the controller (41), and the electric valve A1 is connected to the output port of the high thermal conductivity medium circulation mechanism, the electric valve A3 is connected to the dispatching inlet, and the electric valve A5 is connected to the structure inlet; the electric valve A2 is connected to the output port of the low thermal conductivity medium circulation mechanism, and the electric valve A4 is connected to the atmosphere; Each end of the four-way pipe (43) is respectively installed with an electric valve B1, an electric valve B2, an electric valve B3 and an electric valve B4 electrically connected to the controller (41), and the electric valve B1 is connected to the structure outlet, the electric valve B3 is connected to the input port of the high thermal conductivity medium circulation mechanism; the electric valve B2 is connected to the dispatching outlet, and the electric valve B4 is connected to the input port of the low thermal conductivity medium circulation mechanism.

3. The micro-motion zero-point self-correction temperature measurement device according to claim 2, characterized in that: The active temperature control module includes a heat exchanger (51) and a temperature sensor (52), and the high heat conductivity medium circulation mechanism includes a storage tank (61) and a pump (62). The output port of the pump (62) is connected to the input port of the heat exchanger (51), and the output port of the heat exchanger (51) is connected to the storage tank (61). The storage tank (61) is also connected to the electric valve A1 through a pipeline; the input port of the pump (62) is connected to the electric valve B3; The temperature sensor (52) is detachably connected to the input port of the heat exchanger (51).

4. The micro-motion zero-point self-correction temperature measurement device according to claim 3, characterized in that: The method of performing zero point correction by taking current temperature information until the temperature of the circulating high thermal conductivity medium stabilizes comprises: If the difference between the temperature detection value fed back by the temperature sensor (52) and the calibration reference temperature is less than a preset allowable error, it is determined that the current temperature of the high thermal conductivity medium is stable; Obtaining temperature information generated by the temperature package (2); Calculating the difference between the temperature information and the temperature detection value fed back by the temperature sensor (52) as a correction value; The correction value is used to reset the zero point of the process of generating temperature information by the controller (41) or to add the correction value to the new temperature information.

5. The micro-motion zero-point self-correction temperature measurement device according to claim 3, characterized in that: The low thermal conductivity medium circulation mechanism includes a buffer tank (71) and a second pump (72). The upper part of the buffer tank (71) is connected to the electric valve A2 and the lower part is connected to the output port of the second pump (72). The input port of the second pump (72) is connected to the electric valve B4. A pressure relief valve is installed on the upper part of the buffer tank (71). The pressure relief valve is electrically connected to the control unit. The low thermal conductivity medium is in a gaseous state, and the low thermal conductivity medium circulation mechanism is controlled to fill the scheduling cavity (12) with the low thermal conductivity medium, which includes: The electric valves A2, A4, A5, B2 and B4 are opened, and the pump 2 (72) is opened. After maintaining the preset clearance time t1, the electric valves A2, A4, A5, B2 and B4 are closed, and the pump 2 (72) is closed.

6. The micro-motion zero-point self-correction temperature measurement device according to claim 5, characterized in that: A one-way valve (73) is installed on the pipeline connecting the buffer tank (71) to the electric valve A2. The conduction direction of the one-way valve (73) is toward the electric valve A2. The pipeline between the one-way valve (73) and the electric valve A2 is connected to a branch pipe, and the branch pipe is installed with a solenoid valve (74), and the branch pipe is connected to the gas source; the low thermal conductivity medium circulation mechanism is controlled to fill the scheduling chamber (12) with low thermal conductivity medium, which also includes: after the clearance time t1, the electric valve A4 is first closed, the solenoid valve (74) is opened, and the solenoid valve (74) is closed after maintaining the preset filling time t2, and the electric valves A2, A5, B2 and B4 are closed, and the pump machine 2 (72) is closed.

7. The micro-motion zero-point self-correction temperature measurement device according to claim 6, characterized in that: A vertical lifting mechanism (8) is installed in the buffer tank (71). A floating tube (81) is connected to the inner side of the input port of the buffer tank (71) through a hose. The floating tube (81) is fixed to the lifting part of the lifting mechanism (8). The lifting mechanism (8) is electrically connected to the controller (41). The controller (41) is configured to control the lifting mechanism (8) to pull the floating tube (81) out of the liquid in the buffer tank (71) if the electric valve A2 is opened.

8. The micro-motion zero-point self-correction temperature measurement device according to claim 6, characterized in that: The bottoms of the storage tank (61) and the buffer tank (71) are connected by a pipeline, and a circulation pump (9) is installed on the pipeline. The circulation pump (9) is electrically connected to the controller (41). The controller (41) is configured to: if the current equipment conditions meet the preset backflow conditions, then control the circulation pump (9) to pump the medium from the buffer tank (71) to the storage tank (61).

9. The micro-motion zero-point self-correction temperature measurement device according to claim 3, characterized in that: The input port of the heat exchanger (51) is equipped with a temperature measuring transition pipe, the electric valve B3 is connected to the temperature measuring transition pipe, the temperature measuring transition pipe has a detection window at the beginning, the detection window is threadedly connected to the mounting seat, and the temperature sensor (52) penetrates the mounting seat.

10. A thermostat, characterized in that: The micro-motion zero-point self-correction temperature measuring device according to any one of claims 1 to 9 is installed on a transformer and electrically connected to a monitoring system of the transformer.

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