Digital double-floater gas relay for transformer and multifunctional monitoring system for transformer

Abstract

According to the digital double-floater gas relay for the transformer and the transformer multifunctional monitoring system provided by the invention, when the oil level of the transformer is lowered to a preset position due to gas accumulation, the light gas monitoring system triggers an alarm signal, and the gas volume is measured in real time by the gas volume monitoring system; if the oil level of the transformer oil is further lowered to the limited position of the lower floater, the oil shortage monitoring system triggers an oil shortage alarm; when a serious fault occurs in the transformer and pressure wave flow impacts a relay baffle to a limited position, the heavy gas monitoring system triggers heavy gas alarm; the signals and data are collected by the mainboard and sent to a transformer monitoring system for remote monitoring, analysis and management. According to the double-floater gas relay, digitization is achieved, and the safety monitoring and fault early warning capacity of the transformer is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer protection devices, and in particular to a digital double-float gas relay for a transformer and a transformer multifunctional monitoring system. Background Art

[0002] The gas relay is an important protective device on the transformer. It is installed on the connecting pipe between the transformer's oil tank and the oil storage cabinet and contacts the transformer oil. When an internal fault occurs in the transformer, different gas relay actions can be completed according to the changes in the transformer oil caused by different faults, and corresponding alarm signals or trip signals can be issued to help the staff to correctly handle the fault and repair it, so as to achieve the purpose of protecting the transformer. However, most of the current gas relay technology, especially the double-float gas relay, lacks digital functions and cannot directly convert monitoring data into digital signals for transmission and analysis, which limits the application of gas relays in remote monitoring, data analysis and management, making it impossible for staff to grasp the operating status of the transformer in real time and accurately. In addition, the lack of remote monitoring and data analysis functions also limits the timeliness of fault detection and processing, which may lead to delayed fault response and increase the risk of transformer damage. It is urgent to make up for these defects through technological innovation. Summary of the invention

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a digital double-float gas relay for a transformer and a multifunctional monitoring system for a transformer, which is used to solve the technical problem that the existing double-float gas relays generally lack digital functions, limit remote monitoring, data analysis and application, and thus reduce the safety monitoring and fault warning capabilities of the transformer.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a digital double-float gas relay for a transformer, which is installed on the transformer and contacts the transformer oil, and includes: a light gas monitoring system, which is used to trigger a light gas alarm signal when it is detected that the gas accumulated in the relay forces the transformer oil level to drop to the upper float limit position; a gas volume monitoring system, which is used to collect the capacitance value change of the transformer oil in real time and measure the gas volume data; an oil shortage monitoring system, which is used to trigger an oil shortage alarm signal when it is detected that the transformer oil loss causes the transformer oil level to drop to the lower float limit position; a heavy gas monitoring system, which is used to trigger a heavy gas alarm signal when it is detected that a serious fault occurs inside the transformer and causes the baffle of the relay to move to a limit position; a main board, which is electrically connected to the light gas monitoring system, the gas volume monitoring system, the oil shortage monitoring system, and the heavy gas monitoring system, and is used to collect the light gas alarm signal, the gas volume data, the oil shortage alarm signal, and the heavy gas alarm signal, and send them to the transformer monitoring system.

[0005] In one embodiment of the present invention, the light gas monitoring system includes: an upper float structure and a first signal switch; an upper float and an upper float movement mechanism are provided at both ends of the upper float structure; when the gas accumulated in the relay forces the transformer oil level to drop to the upper float position, the upper float drops, and the upper float movement mechanism triggers the first signal switch to turn on under the drive of the upper float; the oil shortage monitoring system includes: a lower float structure and a second signal switch; a lower float and a lower float movement mechanism are provided at both ends of the lower float structure; when the transformer oil is lost, the transformer oil level drops, driving the lower float to drop, and the lower float movement mechanism triggers the second signal switch to turn on under the drive of the lower float.

[0006] In one embodiment of the present invention, the gas volume monitoring system is arranged in a junction box of a relay, and includes: a capacitance sensor, a temperature measurement chip and a microprocessor; the capacitance sensor is used to detect the capacitance value of the transformer oil in real time; the temperature measurement chip is used to detect the temperature data of the transformer oil in real time; the microprocessor is connected to the capacitance sensor and the temperature measurement chip, and is used to receive the capacitance value from the capacitance sensor and the temperature data from the temperature measurement chip, use a compensation algorithm to correct the capacitance value according to the received temperature data, and measure the gas volume data based on the corrected capacitance value.

[0007] In one embodiment of the present invention, the heavy gas monitoring system includes: a baffle structure and a third signal switch; the baffle structure includes: a baffle and a trigger structure arranged on one side of the baffle; when a serious fault occurs inside the transformer and a pressure wave flow impacts the baffle and causes it to move to a limited position, the trigger structure triggers the third signal switch to turn on under the drive of the baffle.

[0008] In one embodiment of the present invention, the main board is arranged in the junction box of the relay, and includes: a light gas monitoring data acquisition module, connected to the first signal switch, for real-time acquisition of the state of the first signal switch, and when the first signal switch is in the on state, the light gas alarm signal is sent to the transformer monitoring system; a gas volume monitoring data acquisition module, connected to the microprocessor, for collecting gas volume data and sending it to the transformer monitoring system; an oil shortage detection data acquisition module, connected to the second signal switch, for real-time acquisition of the state of the second signal switch, and when the second signal switch is in the on state, the oil shortage alarm signal is sent to the transformer monitoring system; a heavy gas monitoring data acquisition module, connected to the third signal switch, for real-time acquisition of the state of the third signal switch, and when the third signal switch is in the on state, the heavy gas alarm signal is sent to the transformer monitoring system.

[0009] In one embodiment of the present invention, the first signal switch, the second signal switch and the third signal switch use reed switches arranged at different positions of the main frame, which are used to be turned on when the magnet structure in the upper float motion mechanism, the lower float motion mechanism and the trigger structure is adsorbed thereon by magnetic force.

[0010] In one embodiment of the present invention, the light gas monitoring data acquisition module, the gas volume monitoring data acquisition module, the oil shortage detection data acquisition module and the heavy gas monitoring data acquisition module send data to the transformer monitoring system through the RS485 interface.

[0011] In one embodiment of the present invention, the heavy gas monitoring system also includes: an oil flow rate set value adjustment device, including: an adjustable electromagnet superimposed on a permanent magnet arranged on a fixed plate, used to adjust the magnetic force through voltage, thereby adjusting the oil flow rate set value; a micro-lifting mechanism, arranged on the fixed plate, used to adjust the magnetic force through lifting and lowering, thereby adjusting the oil flow rate set value.

[0012] In one embodiment of the present invention, the relay cover is provided with a folded exhaust channel structure to prevent gas from being trapped.

[0013] To achieve the above-mentioned purpose and other related purposes, the present invention provides a transformer multifunctional monitoring system, comprising: a transformer, a transformer monitoring system and the digital double-float gas relay for the transformer; the digital double-float gas relay for the transformer is installed on the transformer and contacts the transformer oil; the digital double-float gas relay for the transformer is communicatively connected with the transformer monitoring system.

[0014] As described above, the present invention is a digital double-float gas relay for transformers and a multifunctional monitoring system for transformers, which have the following beneficial effects: when the gas accumulation causes the transformer oil level to drop to a preset position, the light gas monitoring system will trigger an alarm signal, and the gas volume monitoring system will measure the gas volume in real time; if the transformer oil level further drops to the limited position of the lower float, the oil shortage monitoring system will trigger an oil shortage alarm; when a serious fault occurs inside the transformer, when the pressure wave impacts the relay baffle to a limited position, the heavy gas monitoring system will trigger a heavy gas alarm; these signals and data will be collected by the main board and sent to the transformer monitoring system for remote monitoring, analysis and management. The double-float gas relay of the present invention is digitized and significantly improves the safety monitoring and fault warning capabilities of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing the electrical connection of a digital double-float gas relay for a transformer in one embodiment of the present invention.

[0016] Figure 2Shown is a structural schematic diagram of a gas volume monitoring system in one embodiment of the present invention.

[0017] Figure 3 Shown is a schematic structural diagram of a digital double-float gas relay for a transformer in one embodiment of the present invention.

[0018] Figure 4 Shown is a schematic structural diagram of a mainboard in an embodiment of the present invention.

[0019] Figure 5 Shown is a side view of the internal structure of a digital double-float gas relay for a transformer in one embodiment of the present invention.

[0020] Figure 6 A rear view showing the internal structure of a digital double-float gas relay for a transformer in one embodiment of the present invention.

[0021] Figure 7 It is a schematic diagram showing the installation of a digital double-float gas relay for a transformer in an embodiment of the present invention.

[0022] Figure 8 It shows a communication connection schematic diagram of a digital double-float gas relay for a transformer and a transformer monitoring system in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may also be used, and that mechanical composition, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0025] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0026] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within the scope of the present invention.

[0027] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0028] The present invention provides a digital double-float gas relay for transformers. When gas accumulation causes the transformer oil level to drop to a preset position, the light gas monitoring system will trigger an alarm signal, and the gas volume monitoring system will measure the gas volume in real time; if the transformer oil level further drops to the limited position of the lower float, the oil shortage monitoring system will trigger an oil shortage alarm; when a serious fault occurs inside the transformer, when the pressure wave impacts the relay baffle to a limited position, the heavy gas monitoring system will trigger a heavy gas alarm; these signals and data will be collected by the main board and sent to the transformer monitoring system for remote monitoring, analysis and management. The double-float gas relay of the present invention is digitalized and significantly improves the safety monitoring and fault warning capabilities of the transformer.

[0029] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0030] like Figure 1 A schematic diagram showing electrical connections of a digital double-float gas relay for a transformer according to an embodiment of the present invention is shown.

[0031] Installed on the transformer and in contact with the transformer oil, the working state of the transformer is monitored according to the state of the transformer oil. The transformer digital double-float gas relay includes:

[0032] The light gas monitoring system 1 is used to trigger a light gas alarm signal when it is detected that the accumulated gas in the gas relay forces the liquid level to drop to the upper float limit position;

[0033] Gas volume monitoring system 2, used to collect the capacitance value change of transformer oil in real time and measure gas volume data;

[0034] The oil shortage monitoring system 3 is used to trigger an oil shortage alarm signal when it is detected that the oil loss of the transformer causes the oil level to continue to drop to the lower float limit position;

[0035] The heavy gas monitoring system 4 is used to generate a pressure wave flow moving toward the oil storage cabinet when a serious fault is detected inside the transformer, impacting the baffle of the relay and moving the baffle of the relay to a limited position, thereby triggering a heavy gas alarm signal; the heavy gas alarm signal may also include a trip signal.

[0036] The main board 5, as the core component of the entire digital double-float gas relay, is electrically connected to the light gas monitoring system 1, the gas volume monitoring system 2, the oil shortage monitoring system 3, and the heavy gas monitoring system 4, and is used to collect the light gas alarm signal, gas volume data, oil shortage alarm signal and heavy gas alarm signal, and send them to the transformer monitoring system, thereby realizing remote monitoring, analysis and management.

[0037] Through the present invention, operation and maintenance personnel can receive various monitoring data from the digital double-float gas relay in real time, including light gas alarm signals, gas volume data, oil shortage alarm signals, and heavy gas alarm signals. These data provide operation and maintenance personnel with a comprehensive view of the internal status of the transformer, enabling them to promptly discover and deal with potential problems, thereby effectively avoiding accidents and ensuring the safe and stable operation of the transformer. In addition, through remote monitoring, operation and maintenance personnel can view the historical data of the transformer in real time, conduct trend analysis and fault diagnosis. Through in-depth mining and analysis of the data, operation and maintenance personnel can more accurately judge the health status of the transformer, predict potential faults, and provide a scientific basis for preventive maintenance of the transformer.

[0038] In one embodiment, the light gas monitoring system 1 includes: an upper float structure and a first signal switch; the upper float structure is arranged on the upper part of the main frame, and upper floats and upper float movement mechanisms are arranged at both ends.

[0039] Specifically, when the transformer is working normally, the upper float structure is completely located in the transformer oil. Due to the effects of gravity and buoyancy, the upper float is stable in its normal working position. When a minor fault occurs in the transformer, the gas generated by the decomposition of the transformer oil will gather above the double-float gas relay, thereby causing the transformer oil level to drop. When the transformer oil level drops to the upper float position, the buoyancy of the upper float decreases, and when the gravity is greater than the buoyancy, the upper float drops and drives the lower float motion mechanism at the other end to trigger the first signal switch to turn on.

[0040] The oil shortage monitoring system 2 comprises: a lower float structure and a second signal switch; the lower float structure is arranged at the lower part of the main frame, and the lower float and the lower float movement mechanism are arranged at both ends;

[0041] Specifically, when the transformer is working normally, the lower float structure is completely located in the transformer oil. Due to the effects of gravity and buoyancy, the lower float is stabilized in its normal working position. When the transformer oil level drops until the lower float floats out, there is a large amount of leakage in the transformer, and the buoyancy of the lower float decreases. When the gravity is greater than the buoyancy, the lower float drops and drives the lower float motion mechanism at the other end to trigger the second signal switch to turn on.

[0042] In one embodiment, if Figure 2 , the gas volume monitoring system 2 includes: a capacitive sensor 201, a temperature measurement chip 202 and a microprocessor 203;

[0043] The capacitance sensor 201 is used to detect the capacitance value of transformer oil in real time; the change of capacitance value can reflect the change of oil level, thereby indirectly monitoring the volume of gas. Preferably, the capacitance sensor 201 adopts a special capacitance sensor for the capacitance value change caused by the temperature change of 25# and 45# transformer oil.

[0044] The temperature measurement chip 202 is used to detect the temperature data of the transformer oil in real time; the change of oil temperature will affect the capacitance value, so accurate measurement of oil temperature is crucial for accurate monitoring of gas volume.

[0045] The microprocessor 203 is connected to the capacitance sensor 201 and the temperature measurement chip 202, and is used to receive the capacitance value from the capacitance sensor 201 and the temperature data from the temperature measurement chip 202; the capacitance value is corrected by the received temperature data using a compensation algorithm, and the compensation algorithm is a mathematical model or a lookup table, which describes the relationship between temperature and capacitance value, and this relationship can be linear, nonlinear, or based on the fitting of experimental data. The influence of temperature on the capacitance value is taken into account to ensure that the measurement of the capacitance value is not disturbed by temperature changes. The correction process is to eliminate the influence of temperature changes on the capacitance value measurement results and improve the accuracy of the measurement. By analyzing the capacitance value changes after correction, the microprocessor can calculate the gas volume data.

[0046] It should be noted that if Figure 3 , the gas volume measurement system 2 is set inside the relay junction box. The junction box has an IP67 protection level, which can effectively prevent the intrusion of dust and moisture, thereby ensuring the stability of the system in various harsh environments. At the same time, the junction box is connected to the ground using metal material, which provides a good electromagnetic shielding effect, can reduce external electromagnetic interference, and further improve the measurement accuracy and system reliability. This installation method helps to extend the service life of the equipment and ensure the accuracy of gas volume measurement.

[0047] In one embodiment, the heavy gas monitoring system 4 includes: a baffle structure and a third signal switch; the baffle structure includes: a baffle and a trigger structure arranged on one side of the baffle; the upper end of the baffle is rotatably arranged on the upper part of the main frame; that is, when the baffle rotates, the trigger structure is driven to rotate by the baffle, thereby changing the distance from the third signal switch.

[0048] Specifically, when the transformer is working normally, the baffle is in a normal working position. When a serious fault occurs inside the transformer, a pressure wave flow is generated that moves toward the oil storage cabinet, impacting the baffle of the relay and causing it to move. When the baffle moves to a limited position, the trigger structure triggers the third signal switch to turn on under the drive of the baffle.

[0049] In one embodiment, if Figure 4 The main board 5 is arranged in the junction box of the relay and includes:

[0050] A light gas monitoring data acquisition module 501 is connected to the first signal switch, and is used to collect the state of the first signal switch in real time, and when the first signal switch is in the on state, send a light gas alarm signal to the transformer monitoring system;

[0051] A gas volume monitoring data acquisition module 502, connected to the microprocessor, for collecting gas volume data and sending it to the transformer monitoring system;

[0052] The oil shortage detection data acquisition module 503 is connected to the second signal switch, and is used to collect the state of the second signal switch in real time, and send the oil shortage alarm signal to the transformer monitoring system when the second signal switch is in the on state;

[0053] The heavy gas monitoring data acquisition module 504 is connected to the third signal switch, and is used to collect the state of the third signal switch in real time, and when the third signal switch is in the on state, send the heavy gas alarm signal to the transformer monitoring system.

[0054] In one embodiment, the first signal switch, the second signal switch and the third signal switch are reed switches arranged at different positions of the main frame, and are used to be connected when the upper float motion mechanism, the lower float motion mechanism and the magnet structure in the trigger structure are adsorbed thereon by magnetic force.

[0055] In a specific embodiment, the first signal switch is a first reed switch, the second signal switch is a second reed switch, and the third signal switch is a third reed switch.

[0056] Combination Figure 3 To illustrate, the middle part of the upper float structure is rotatably arranged on the upper part of the main frame, and a magnet structure is installed at one end of the upper float movement mechanism; the middle part of the lower float structure is rotatably arranged on the lower part of the main frame, and a magnet structure is installed at one end of the lower float movement mechanism; the upper float 101 in the upper float structure is arranged above the lower float 301 of the lower float structure;

[0057] When the gas accumulated in the gas relay forces the transformer oil level to drop to the upper float position, the buoyancy of the upper float 101 decreases, and when the gravity is greater than the buoyancy, the upper float 101 drops, and drives the magnet structure of the float motion mechanism at the other end to drop and approach the first reed switch. The magnet structure absorbs the first reed switch through magnetic force, the first reed switch is closed, and then the first signal switch is turned on. The light gas monitoring data acquisition module detects that the first reed switch is in a closed state, and then sends a light gas alarm signal to the transformer monitoring system.

[0058] When the transformer oil level drops until the lower float 301 floats out, there is a large amount of leakage in the transformer, and the buoyancy of the lower float 301 decreases. When the gravity is greater than the buoyancy, the lower float 301 drops, and drives the lower float motion mechanism and the magnet structure at the other end to drop and approach the second reed switch. The magnet structure absorbs the second reed switch through magnetic force to close it, and then the second signal switch is turned on. The oil shortage detection data acquisition module detects that the second reed switch is in the closed state, and then sends the oil shortage alarm signal to the transformer monitoring system.

[0059] The trigger structure includes a magnet structure. When a serious fault occurs inside the transformer and a pressure wave flow impacts the baffle to move it to a limited position, the magnet structure approaches the third reed switch. The magnet structure attracts the third reed switch through magnetic force to close it, and then the second signal switch is turned on; when the heavy gas monitoring data acquisition module detects that the third reed switch is in a closed state, the heavy gas alarm signal is sent to the transformer monitoring system.

[0060] In one embodiment, the light gas monitoring data acquisition module 501 sends the light gas alarm signal to the transformer monitoring system through the RS485 interface; the gas volume monitoring data acquisition module 502 sends the gas volume data to the transformer monitoring system through the RS485 interface; the oil shortage detection data acquisition module 503 sends the oil shortage alarm signal to the transformer monitoring system through the RS485 interface; the heavy gas monitoring data acquisition module 504 sends the heavy gas alarm signal to the transformer monitoring system through the RS485 interface.

[0061] In one embodiment, if Figure 5 The baffle 401 is made of carbon steel, and a fixed plate 402 is arranged at a corresponding position on the upper part of the baffle 401. The fixed plate 402 is equipped with a permanent magnet 403, and the upper part of the baffle 401 is adsorbed by the magnetic force of the permanent magnet 403. The magnitude of the magnetic force is directly related to the ability of the baffle 401 to resist the oil flow speed, that is, the stronger the magnetic force, the higher the oil flow speed that the baffle 401 can resist.

[0062] The heavy gas monitoring system also includes: an oil flow rate setting value adjustment device, including:

[0063] The adjustable electromagnet is superimposed on the permanent magnet 403 and is used to adjust the magnetic force through voltage, thereby adjusting the oil flow rate setting value; specifically, when the oil flow rate setting value needs to be increased, we can increase the voltage applied to the adjustable electromagnet to enhance its magnetic force, so that the baffle 401 is more firmly adsorbed on the fixed plate 402, thereby enhancing the ability of the baffle 401 to resist higher oil flow speeds. On the contrary, when the oil flow rate setting value needs to be reduced, we only need to reduce the voltage to weaken the magnetic force of the electromagnet, so that the resistance of the baffle 401 to the oil flow is correspondingly reduced.

[0064] The micro lifting mechanism 404 is arranged on the fixed plate 402 and below the permanent magnet 403. Through the lifting action of the micro lifting mechanism 404, the distance between the corresponding position of the fixed plate 402 and the baffle 401 can be adjusted. When the micro lifting mechanism 404 rises, the distance between the fixed plate 402 and the baffle 401 will increase accordingly, which will cause the magnetic force of the permanent magnet 403 on the baffle 401 to weaken, thereby reducing the adsorption force between the baffle 401 and the permanent magnet 403. Due to the reduction of the adsorption force, the ability of the baffle to resist the oil flow will also be weakened accordingly. Therefore, the requirement for the oil flow rate will be reduced, and the oil flow rate setting value will also be reduced accordingly. On the contrary, when the micro lifting mechanism 404 descends, the distance between the fixed plate 402 and the baffle 401 will be reduced, and the magnetic force of the permanent magnet 403 on the baffle 401 will be strengthened accordingly, thereby increasing the adsorption force between the baffle 401 and the permanent magnet 403. This enhanced adsorption force will enable the baffle 401 to more stably resist the impact of the oil flow, so the requirement for the oil flow rate will be increased and the oil flow rate setting value will also increase accordingly.

[0065] Preferably, the micro lifting mechanism 404 may adopt a bolt structure. The bolt structure is not only simple in structure and easy to operate, but also can withstand a large load, ensuring that the micro lifting mechanism can always maintain a stable lifting function during long-term use, thereby achieving accurate adjustment of the oil flow rate setting value.

[0066] In one embodiment, if Figure 6 The upper cover of the gas relay is provided with a return exhaust channel structure 6, which effectively prevents gas stagnation. The pipeline is inclined upward by four degrees, so the exhaust is not at the highest point. The return exhaust channel structure 6 is used to move the highest point backward, so that after the gas enters, the transformer oil will have a recoil, which can prevent the gas from being effectively prevented from being stagnant.

[0067] In one embodiment, if Figure 5 The installation of a waterproof breathable valve 7 on the gas relay junction box can significantly improve the overall reliability of the device. By balancing the internal and external air pressure, the waterproof breathable valve 7 effectively prevents the intrusion of moisture and pollutants, while allowing internal moisture to be discharged, reducing the risk of failure caused by moisture.

[0068] In one embodiment, the gas relay housing adopts a double-window structure to facilitate observation of the internal state and improve user-friendliness.

[0069] In one embodiment, if Figure 3 Two indicator lights 8 and 9 are arranged above the gas relay junction box. One indicator light is used to indicate the communication status, so that the user can intuitively understand the current communication connection status of the relay; the other indicator light is used to indicate the self-test status, which is convenient for the user to monitor the detection and operation status of the relay itself.

[0070] The present invention provides a transformer multifunctional monitoring system, which comprises: a transformer, a transformer monitoring system, and a digital double-float gas relay for the transformer capable of realizing the functions of the above-mentioned embodiment;

[0071] like Figure 7 The digital double-float gas relay 300 for transformer is installed on the transformer 100, and the transformer 100 includes an iron core 12. When a minor fault occurs in the transformer 2, the small amount of heat generated by the iron core 2 will decompose a small amount of gas from the transformer oil, and the gas will be accumulated on the upper part of the double-float gas relay 1, and the transformer oil level will drop to the upper float position, triggering a minor fault alarm signal; when there is a large amount of leakage in the transformer 2, the iron core 12 will trigger an oil shortage alarm signal when the transformer oil level drops until the lower float floats out; when a serious fault occurs inside the transformer, the iron core 12 will generate a pressure wave flow moving toward the oil storage cabinet, impacting the baffle of the relay and causing it to move. When the baffle moves to a limited position, a heavy gas alarm signal is triggered.

[0072] like Figure 8The transformer uses a digital double-float gas relay 300 to communicate with the transformer monitoring system 200; when the light gas monitoring system 1 detects that the accumulated gas in the gas relay forces the liquid level to drop to the upper float limit position, the light gas alarm signal is triggered, and the main board 5 collects the light gas alarm signal and sends it to the transformer monitoring system 200 by the main board 5; the gas volume monitoring system 2 collects the capacitance value change of the transformer oil in real time and measures the gas volume data, and the main board 5 collects the gas volume data and sends it to the transformer monitoring system 200 by the main board 5; when the oil shortage monitoring system 3 detects that the liquid level continues to drop and reaches the lower float limit position, the oil shortage alarm signal is triggered, and the main board 5 collects the oil shortage alarm signal and sends it to the transformer monitoring system 200 by the main board 5. When the heavy gas monitoring system 4 detects a serious fault inside the transformer, it generates a pressure wave flow moving toward the oil storage cabinet. When the baffle of the impact relay moves to a limited position, a heavy gas alarm signal is triggered. The main board 5 collects the heavy gas alarm signal and sends it to the transformer monitoring system by the main board 5. The transformer monitoring system performs remote monitoring, analysis and management. The transformer monitoring system 200 performs remote monitoring, and the operation and maintenance personnel can monitor the operating status of the transformer in real time remotely. This includes viewing real-time monitoring data, receiving alarm signals, analyzing historical data, etc. The remote monitoring function enables the operation and maintenance personnel to respond quickly to abnormal conditions of the transformer and reduce the probability and impact of failures. The transformer monitoring system 200 has powerful data analysis and management functions. It can process and analyze the received data in real time to evaluate the health status and potential risks of the transformer. Through data analysis, the system can predict the life of the transformer, detect potential fault points, and provide maintenance suggestions for the operation and maintenance personnel. In addition, the transformer monitoring system 200 can also generate various reports and charts so that the operation and maintenance personnel can better understand the operation and trend of the transformer.

[0073] In summary, the digital double-float gas relay for transformers and the multifunctional monitoring system for transformers of the present invention, when gas accumulation causes the transformer oil level to drop to a preset position, the light gas monitoring system will trigger an alarm signal, and the gas volume monitoring system will measure the gas volume in real time; if the transformer oil level further drops to the limited position of the lower float, the oil shortage monitoring system will trigger an oil shortage alarm; when a serious fault occurs inside the transformer, when the pressure wave flow impacts the relay baffle to a limited position, the heavy gas monitoring system will trigger a heavy gas alarm; these signals and data will be collected by the main board and sent to the transformer monitoring system for remote monitoring, analysis and management. The double-float gas relay of the present invention is digitized and significantly improves the safety monitoring and fault warning capabilities of the transformer. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A digital double-float gas relay for a transformer, characterized in that: Installed on the transformer and in contact with transformer oil, including: Light gas monitoring system, used to trigger light gas alarm signal when it detects that the gas accumulated in the relay forces the transformer oil level to drop to the upper float limit position; Gas volume monitoring system, used to collect the capacitance value changes of transformer oil in real time and measure gas volume data; The oil shortage monitoring system is used to trigger an oil shortage alarm signal when the transformer oil loss is detected and the transformer oil level drops to the lower float limit position; Heavy gas monitoring system, used to trigger heavy gas alarm signal when a serious fault is detected inside the transformer causing the baffle of the relay to move to a limited position; The main board is electrically connected to the light gas monitoring system, gas volume monitoring system, oil shortage monitoring system and heavy gas monitoring system, and is used to collect the light gas alarm signal, gas volume data, oil shortage alarm signal and heavy gas alarm signal, and send them to the transformer monitoring system.

2. The digital double-float gas relay for transformer according to claim 1, characterized in that: The light gas monitoring system comprises: an upper float structure and a first signal switch; upper floats and upper float movement mechanisms are arranged at both ends of the upper float structure; When the gas accumulated in the relay forces the transformer oil level to drop to the upper float position, the upper float drops, and the upper float movement mechanism is driven by the upper float to trigger the first signal switch to turn on; The oil shortage monitoring system comprises: a lower float structure and a second signal switch; lower floats and lower float motion mechanisms are arranged at both ends of the lower float structure; When the transformer oil is lost, the transformer oil level drops, driving the lower float to drop, and the lower float movement mechanism is driven by the lower float to trigger the second signal switch to turn on.

3. The digital double-float gas relay for transformer according to claim 1, characterized in that: The gas volume monitoring system is arranged in the junction box of the relay, and includes: a capacitance sensor, a temperature measurement chip and a microprocessor; The capacitance sensor is used to detect the capacitance value of transformer oil in real time; The temperature measurement chip is used to detect the temperature data of the transformer oil in real time; The microprocessor is connected to the capacitance sensor and the temperature measurement chip, and is used to receive the capacitance value from the capacitance sensor and the temperature data from the temperature measurement chip, correct the capacitance value based on the received temperature data using a compensation algorithm, and measure the gas volume data based on the corrected capacitance value.

4. The digital double-float gas relay for transformer according to claim 1, characterized in that: The heavy gas monitoring system comprises: a baffle structure and a third signal switch; the baffle structure comprises: a baffle and a trigger structure arranged on one side of the baffle; When a serious fault occurs inside the transformer and a pressure wave flow is generated to impact the baffle plate and cause it to move to a limited position, the trigger structure is driven by the baffle plate to trigger the third signal switch to turn on.

5. The digital double-float gas relay for transformer according to any one of claims 2, 3 and 4, characterized in that: The main board is arranged in a junction box of the relay, and includes: A light gas monitoring data acquisition module, connected to the first signal switch, for real-time acquisition of the state of the first signal switch, and when the first signal switch is in the on state, sending a light gas alarm signal to the transformer monitoring system; A gas volume monitoring data acquisition module, connected to the microprocessor, for collecting gas volume data and sending it to the transformer monitoring system; an oil shortage detection data acquisition module, connected to the second signal switch, for real-time acquisition of the state of the second signal switch, and sending an oil shortage alarm signal to the transformer monitoring system when the second signal switch is in the on state; The heavy gas monitoring data acquisition module is connected to the third signal switch and is used to collect the status of the third signal switch in real time, and when the third signal switch is in the on state, send the heavy gas alarm signal to the transformer monitoring system.

6. The digital double-float gas relay for transformer according to claim 2 or 4, characterized in that: The first signal switch, the second signal switch and the third signal switch use reed switches arranged at different positions of the main frame, and are used to be connected when the magnet structure in the upper float motion mechanism, the lower float motion mechanism and the trigger structure is adsorbed thereon by magnetic force.

7. The digital double-float gas relay for transformer according to claim 5, characterized in that: The light gas monitoring data acquisition module, gas volume monitoring data acquisition module, oil shortage detection data acquisition module and heavy gas monitoring data acquisition module send data to the transformer monitoring system through the RS485 interface.

8. The digital double-float gas relay for transformer according to claim 4, characterized in that: The heavy gas monitoring system also includes: an oil flow rate setting value adjustment device, including: The adjustable electromagnet is superimposed on the permanent magnet set on the fixed plate and is used to adjust the magnetic force through voltage, thereby adjusting the oil flow rate setting value; The micro lifting mechanism is arranged on the fixed plate and is used to adjust the magnitude of the magnetic force by lifting and lowering, thereby adjusting the set value of the oil flow rate.

9. The digital double-float gas relay for transformer according to claim 1, characterized in that: The relay cover is provided with a folded exhaust channel structure to prevent gas stagnation.

10. A transformer multifunctional monitoring system, characterized in that: include: A transformer, a transformer monitoring system, and a digital double-float gas relay for a transformer as claimed in any one of claims 1 to 9; The transformer digital double-float gas relay is installed on the transformer and contacts the transformer oil; the transformer digital double-float gas relay is communicatively connected with the transformer monitoring system.

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