Digital gas relay and its on-line monitoring system

Abstract

This application relates to the field of electrical engineering, and more particularly to a digital gas relay, comprising a housing with an opening on its upper side and a sealing top cover at the opening; a mounting bracket fixed to the side of the top cover facing inwards from the housing; an upper detection mechanism and a monitoring element; wherein the upper detection mechanism includes an upper float hinged to the mounting bracket and an upper trigger switch mounted on the mounting bracket, when the gas volume inside the housing reaches a first set value, the liquid level drives the upper float to a first set position, triggering the upper trigger switch to issue an alarm signal; the monitoring element is mounted on the mounting bracket and connected to a detection circuit, and the detection element includes an adjustment terminal connected to the upper float. This application allows for convenient determination of the gas volume within the gas relay regardless of the gas content, facilitating analysis of the equipment's operating status and determining whether maintenance is required.

Description

Technical Field

[0001] This application relates to the field of electrical engineering, and in particular to a digital gas relay and its online monitoring system. Background Technology

[0002] A gas relay is a specialized relay protection device used in transformers, also known as a gas relay. The gas relay is installed between the transformer and the oil tank. It contains a detection component. When the oil level is full, the detection component is either in standby or disconnected. If the transformer generates gas or leaks, causing gas to enter the relay, the oil level inside the relay drops. When the oil level drops to a first set position, the detection component is triggered, sending an alarm signal to alert personnel to perform appropriate maintenance.

[0003] Regarding the aforementioned technologies, the inventors have discovered that currently used gas relays, when detecting whether a transformer is generating gas or leaking gas, can only trigger the detection component to issue a corresponding alarm signal after the gas volume reaches a certain set value. Before the gas volume reaches the set value, it is impossible to know the amount of gas, making it inconvenient to monitor the process of generating gas or gas leakage. Summary of the Invention

[0004] In order to facilitate the easy determination of the gas quantity in gas relays with varying gas concentrations, thereby enabling analysis of equipment operation and determining the need for maintenance, this application provides a digital gas relay and its online monitoring system.

[0005] In a first aspect, this application provides a digital gas relay, which adopts the following technical solution:

[0006] A digital gas relay, including

[0007] The housing has an opening on its upper side, and a top cover for sealing is provided at the opening;

[0008] Mounting bracket, fixed to the side of the top cover facing the inside of the housing;

[0009] The upper detection mechanism is used to detect the liquid level inside the casing and issue an alarm signal when the gas volume inside the casing reaches a first set value; and

[0010] Monitoring elements;

[0011] The upper detection mechanism includes an upper float hinged to the mounting frame and an upper trigger switch set on the mounting frame. When the gas volume inside the housing reaches a first set value, the liquid level drives the upper float to a first set position, triggering the upper trigger switch to connect and issue an alarm signal.

[0012] The monitoring element is mounted on the mounting bracket and connected to the detection circuit. The monitoring element includes an adjustment terminal, which is connected to an upper float ball. The upper float ball rotates, causing the adjustment terminal to move and adjust the signal value output by the monitoring element.

[0013] By adopting the above technical solution, as the liquid level in the relay decreases, the float moves the adjustment terminal of the monitoring element, causing the corresponding detection signal of the monitoring element to change. By calculating the detection signal data of the monitoring element, the gas volume in the relay can be obtained in real time. It is convenient to know the gas volume in the relay at any time and can obtain accurate gas volume data.

[0014] Optionally, the monitoring element is a rheostat, and the adjustment terminal of the rheostat is connected to the upper float ball. The rise and fall of the upper float ball drives the adjustment terminal of the rheostat to move.

[0015] By adopting the above technical solution, a detection circuit is set up to detect the voltage or current of the rheostat, and the change in the resistance value of the rheostat can be obtained. Then, based on the properties of the rheostat itself, the moving distance of its adjustment terminal can be easily determined. The detection principle is relatively convenient, reducing the difficulty of obtaining the amount of gas in the relay in real time.

[0016] Optionally, the upper float is provided with connecting rods at both ends, the connecting rods are rotatably connected to the mounting bracket, the adjusting terminal of the rheostat is connected to the connecting rods, and is rotatably connected to the rheostat body.

[0017] By adopting the above technical solution, the rheostat can be directly fixed on the mounting bracket, and the adjustment terminal of the rheostat can be connected to the rotation shaft of the connecting rod, thus completing the installation of the rheostat. The operation is more convenient, and there is no need to convert the rotation of the float ball and the connecting rod into linear movement again, which improves the convenience of use.

[0018] Optionally, the upper trigger switch is a reed switch, and an upper trigger magnet for triggering the reed switch to close is fixed on the upper float.

[0019] By adopting the above technical solution, after the float rotates to the first set position, the reed switch closes under the action of the upper trigger magnet, which can trigger the corresponding alarm signal. Compared with the triggering method through mechanical structure connection, it is less likely to have wear and failure problems during long-term use, thus improving the stability of the relay operation.

[0020] Optionally, the mounting bracket is provided with a limit bracket, and the upper float abuts against the upper side of the limit bracket to maintain a height at a first set position.

[0021] By adopting the above technical solution, as the liquid level inside the relay continues to drop, the float ball abuts against the upper side of the limit frame, keeping the float ball in the first set position. The alarm signal is always in the triggered state, reducing the phenomenon that the float ball causes the upper trigger magnet and the upper trigger switch to misalign as the liquid level drops, thus causing the upper trigger switch to disconnect. At the same time, the displacement path of the float ball is restricted, making it less likely for the float ball to collide with other structures and cause damage.

[0022] Optionally, a lower detection mechanism is provided on the lower side of the mounting bracket. The lower detection mechanism includes a lower float ball rotatably connected to the mounting bracket and a lower trigger switch provided on the mounting bracket. The lower trigger switch is also connected to the detection circuit. When the lower float ball descends to the second set position, it triggers the lower trigger switch to connect, and the lower trigger switch sends a signal to the detection circuit to trigger an alarm signal.

[0023] By adopting the above technical solution, as the oil level continues to decrease, the lower float will drop in height, causing the lower trigger switch to close. The relay will then issue an oil shortage alarm signal to remind staff to replenish the oil and perform corresponding maintenance work.

[0024] Optionally, the gas relay further includes a baffle hinged to the mounting bracket and a heavy gas trigger switch mounted on the mounting bracket; the baffle is perpendicular to the oil path flowing through the gas relay, and the baffle rotates away from the transformer to a third set position under the impact of the oil, triggering the heavy gas trigger switch to close; the heavy gas trigger switch is connected to the detection circuit and triggers the corresponding alarm signal.

[0025] By adopting the above technical solution, when a transformer failure causes a short-term increase in internal pressure, the oil flows back from the transformer to the oil conservator, impacting the baffle and causing the heavy gas trigger switch to close. This further enhances the comprehensiveness of the relay's detection. In actual use, the heavy gas trigger switch closes and issues an alarm signal while simultaneously controlling the transformer to shut down and reduce the risk of more serious accidents.

[0026] Optionally, the mounting bracket has an elastic element that applies a spring force to the baffle to keep the baffle in a vertical state. Under the impact of the oil, the baffle overcomes the spring force of the elastic element and rotates to a third set position.

[0027] By adopting the above technical solution, when the oil in the transformer flows back to the oil conservator, the heavy gas trigger switch can only be closed when the force of the oil impacting the baffle is sufficient to overcome the elastic force of the elastic element. This reduces the phenomenon of the heavy gas trigger switch being triggered due to relay shaking or the oil flowing within the normal flow rate range, and makes it less likely to cause false alarms.

[0028] Secondly, this application provides a digital gas relay online monitoring system, which adopts the following technical solution:

[0029] A digital gas relay online monitoring system includes a detection module, a monitoring element, and a data processing and display module; wherein...

[0030] The detection module is installed inside the housing to detect the liquid level inside the housing and to issue corresponding alarm signals when the liquid level reaches different preset heights.

[0031] The monitoring element is installed inside the housing to monitor the gas volume inside the housing;

[0032] The data processing and display module is located outside the housing. The data processing and display module is connected to the monitoring element inside the housing through a detection circuit, receives the signal transmitted by the monitoring element, calculates the gas volume in the housing through the corresponding software program, and stores and displays the data on the trend of gas volume change in the housing over time.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. By setting a monitoring element, as the liquid level in the relay decreases, the float moves the adjustment terminal of the monitoring element, causing the corresponding detection signal of the monitoring element to change. By calculating the detection signal data of the monitoring element, the gas volume in the relay can be obtained in real time. It is convenient to know the gas volume in the relay at any time and can obtain accurate gas volume data.

[0035] 2. The data processing and display module receives the detection data from the monitoring element, calculates the amount of gas inside the relay, stores and displays the gas amount data, and can conveniently and intuitively obtain the real-time gas amount inside the relay. It can also obtain the trend of gas amount inside the relay changing over time, which is helpful for analyzing transformer faults. Attached Figure Description

[0036] Figure 1 This is an overall schematic diagram of the gas relay according to an embodiment of this application;

[0037] Figure 2 This is a schematic diagram created to illustrate the internal structure of a relay.

[0038] Figure 3 This is a schematic diagram created to illustrate the mounting structure of a rheostat.

[0039] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0040] Figure 5 This is a schematic diagram to illustrate the structure of the heavy gas detection component.

[0041] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Top cover; 111. Air vent; 12. Mounting bracket; 13. Limiting bracket; 14. Limiting component; 141. Mounting plate; 142. Limiting bolt; 2. Upper detection mechanism; 21. Upper float; 22. Upper trigger switch; 23. Connecting rod; 24. Upper trigger magnet; 25. Mounting shaft; 26. End screw; 27. Adapter post; 271. Second contact surface; 3. Monitoring element; 31. Adjustment terminal; 311. First contact surface; 4. Data processing and display module; 5. Lower detection mechanism; 51. Lower float; 52. Lower trigger switch; 53. Lower trigger magnet; 6. Heavy gas monitoring component; 61. Baffle; 62. Heavy gas trigger switch; 63. Heavy gas trigger magnet; 64. Elastic component; 641. Mounting rod; 642. Positioning spring. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0043] This application discloses a digital gas relay, which is connected between a transformer and an oil tank via a pipeline. (Refer to...) Figure 1 and Figure 2 The gas relay includes a housing 1 with openings at both opposite ends for fixing pipes to connect to the transformer and oil tank. The upper end of the housing 1 also has an opening for mounting a corresponding detection mechanism inside. A top cover 11 is provided at the upper opening of the housing 1 to seal it. A mounting bracket 12 is bolted to the side of the top cover 11 facing inwards from the housing 1. This mounting bracket 12 is used to mount the detection mechanism inside the relay, and the top cover 11 and the housing 1 are sealed to ensure a good sealing effect and reduce leakage. Additionally, a vent 111 is provided on the top cover 11, which communicates with the upper side of the internal space of the housing 1. If gas accumulates in the upper part of the housing 1, the gas can be led out through the vent 111.

[0044] Reference Figure 2The mounting frame 12 is equipped with an upper detection mechanism 2, including an upper float 21 hinged to the mounting frame 12 and an upper trigger switch 22 fixed to the mounting frame 12. Connecting rods 23 are fixed to both ends of the upper float 21. The end of the connecting rod 23 away from the upper float 21 is hinged to the mounting frame 12, thus achieving the hinge connection between the upper float 21 and the mounting frame 12. When the relay is filled with oil, the upper float 21 is located above the upper trigger switch 22. As gas or other gases are discharged into the relay, the upper float 21 descends with the liquid level. When the upper float 21 descends to the first set position, it triggers the upper trigger switch 22 to close. The upper trigger switch 22 is connected to the power supply via a circuit. The alarm is connected to the relay to realize the alarm function, indicating that the gas volume in the relay has reached the first set value and the staff needs to be reminded to perform gas introduction and maintenance. In this embodiment, the upper trigger switch 22 is a reed switch, and an upper trigger magnet 24 is fixed on the upper float 21 on the side opposite to the upper trigger switch. After the upper float 21 descends to the first set position, the upper trigger magnet 24 acts on the reed switch to close it. In other embodiments, the upper trigger magnet 24 can also be fixed to one end of the connecting rod 23 on the upper float 21, as long as it can trigger the reed switch to close when the upper float 21 descends to the first set position.

[0045] Reference Figure 2 A monitoring element 3 for detecting the amount of gas inside the relay is fixedly installed on the mounting bracket 12. The monitoring element 3 includes an adjustment terminal 31. The numerical properties of the monitoring element 3 itself are adjusted through the adjustment terminal 31. The monitoring element 3 is connected to a circuit, and the circuit detects the signal value output by the monitoring element 3. The adjustment terminal 31 is connected to a connecting rod 23. The rise and fall of the upper float 21 drives the connecting rod 23 to rotate, and then the connecting rod 23 drives the adjustment terminal 31 to move, thereby adjusting the output signal of the monitoring element 3. The signal is output through the connected circuit and calculated by the corresponding software. The amount of movement of the adjustment terminal 31 and the height of the upper float 21 can be calculated based on the output signal value. Finally, combined with the size of the internal cavity of the relay, the gas volume inside the relay can be obtained.

[0046] Reference Figure 2In this embodiment, the monitoring element 3 is a rheostat, and the rheostat is a rotary adjuster. The adjusting terminal 31 of the rheostat is connected to the connecting rod 23 and rotates with the rise and fall of the upper float 21 to adjust the resistance value of the rheostat. The resistance value of the rheostat can be obtained by detecting the voltage value across the rheostat or the current value through the rheostat. Of course, in actual use, the resistance value of the rheostat can also be obtained by other means. Various methods for measuring the resistance value of the rheostat are well known measurement means, so they will not be described in detail here. After obtaining the resistance value of the rheostat through software processing, the liquid level height and gas volume in the relay can be obtained by the amount of movement of the adjusting terminal 31 driven by the upper float 21.

[0047] For specific installation methods of the rheostat, please refer to... Figure 3 and Figure 4 A mounting shaft 25 is provided between the two connecting rods 23, with both ends of the mounting shaft 25 abutting against the two connecting rods 23 respectively. End screws 26 are provided at both ends of the mounting shaft 25, with the shank of the end screw 26 threaded through the connecting rod 23 and connected to the mounting shaft 25. The head of the end screw 26 engages with the end face of the mounting shaft 25 to clamp the connecting rod 23. Simultaneously, the end screw 26 penetrates the mounting bracket 12, with its head engaging with the mounting bracket 12, achieving a rotatable connection between the connecting rod 23 and the mounting bracket 12. The mounting shaft 25 and the end screws 26 rotate synchronously with the connecting rods 23. A fixing screw is located on the end face of the end screw 26 facing the rheostat. A converter post 27 has a first abutment surface 311 on the adjusting terminal 31, and a second abutment surface 271 on the converter post 27 that matches the first abutment surface 311. The rheostat is fixed on the mounting bracket 12, and the converter post 27 is inserted into the through hole of the rheostat, with the second abutment surface 271 in contact with the first abutment surface 311. Thus, during the raising and lowering of the upper float 21, the connecting rod 23 drives the mounting shaft 25 and the end screw 26 to rotate, and the resistance value of the rheostat can be adjusted through the adjusting terminal 31. It is convenient to install the upper float 21 and connect the rheostat to the upper float 21 to adjust the resistance value of the rheostat by raising and lowering the upper float 21.

[0048] Additionally, refer to Figure 1 and Figure 2The gas relay also includes a data processing and display module 4, which is connected to the monitoring element 3 inside the housing 1. When the amount of gas inside the housing 1 changes, the data processing and display module 4 receives the corresponding signal data information, calculates according to the corresponding formula, and finally obtains the gas content and directly displays the gas volume information. At the same time, the data processing module also has a storage function, continuously detects the gas volume inside the housing 1, establishes the corresponding gas volume-time relationship curve, and can record the gas content inside the housing 1 at each time point in real time. The data processing and display module 4 and the detection element are set up to form an online monitoring system, which can continuously detect the amount of gas inside the relay, obtain the gas volume data in the relay in real time, and make it easy to know the gas content inside the relay at any time. Moreover, it can accurately know the real-time gas volume inside the relay, rather than a range value.

[0049] By using the monitoring element 3, the gas volume inside the housing 1 can be monitored in real time. Compared to the existing method that only triggers an alarm when the gas volume inside the housing 1 reaches a set limit, this method can more accurately measure and record the change in gas volume inside the housing 1 over time. By analyzing the recorded and stored data, the gas generation rate can be determined. Before reaching the set alarm value, the gas volume can be easily determined to identify whether maintenance or venting is required. Furthermore, by observing the gas volume change curve over time and the gas generation rate, the method can help deduce the possible fault types within a certain range, providing a more accurate basis for subsequent maintenance work. In addition, by adjusting the data processing and display module 4, a warning value can be set. When the gas volume inside the housing 1 is detected to reach a certain set value, an early warning can be issued, reducing the problem of not being able to carry out maintenance in time when the gas volume reaches the alarm value later.

[0050] Reference Figure 2 A limiting bracket 13 is fixed on the mounting bracket 12. When the upper float 21 descends to the first set position, the upper float 21 abuts against the limiting bracket 13, restricting the upper float 21 from continuing to rotate and descend. In this way, after the gas volume in the housing 1 reaches the set alarm value, the position of the upper float 21 is maintained in the state of keeping the upper trigger switch 22 closed, reducing the phenomenon that the upper float 21 descends too much and becomes misaligned with the upper trigger switch 22. In addition, during the rotation of the upper float 21, it will drive the adjustment terminal 31 of the rheostat to rotate synchronously, limiting the floating height of the upper float 21, and also preventing the upper float 21 from descending too much and causing damage to the rheostat and other components in the relay.

[0051] Reference Figure 2A lower detection mechanism 5 is also provided on the lower side of the mounting bracket 12. The lower detection mechanism 5 includes a lower float ball 51 rotatably connected to the mounting bracket 12. Correspondingly, a lower trigger switch 52 is fixed on the mounting bracket 12. The lower trigger switch 52 is also a reed switch. At the same time, a lower trigger magnet 53 is fixed on the lower float ball 51. When the height of the lower float ball 51 drops to the second set position, the lower trigger magnet 53 corresponds to the lower trigger switch 52, so that the lower trigger switch 52 is in a closed state and sends out a corresponding signal through the circuit. After the height of the liquid level in the housing 1 drops to the height at which the lower trigger switch 52 is connected, the relay sends out an oil shortage alarm signal. This allows the gas relay to monitor the gas volume and detect whether there is an oil shortage problem. In the event of damage or leakage of the transformer, timely repair and oil replenishment can be carried out to reduce the impact on the normal use of the transformer.

[0052] Reference Figure 2 The mounting bracket 12 is provided with a limiting component 14, which includes a mounting plate 141 fixed on the mounting bracket 12. After the lower float 51 descends to the second set position, the lower float 51 abuts against the mounting plate 141 to limit the lower float 51 and limit the rotation angle of the lower float 51, so that the lower float 51 is kept at the second set position. The lower trigger switch 52 is always in the trigger state and continuously sends out the low oil alarm signal, reducing the problem that the staff may not notice the alarm signal in time.

[0053] During transformer operation, a transformer fault may occur, causing a significant increase in internal pressure within a short period. In this situation, the oil inside the transformer flows towards the relays and oil conservator under pressure. To monitor for this type of transformer fault, refer to... Figure 2 The housing 1 is equipped with a heavy gas detection component 6.

[0054] Reference Figure 2 and Figure 5The heavy gas detection component 6 includes a baffle 61 hinged to the mounting bracket 12 and a heavy gas trigger switch 62 fixed to the mounting bracket 12. The heavy gas trigger switch 62 is also a reed switch. A heavy gas trigger magnet 63, which works in conjunction with the heavy gas trigger switch 62, is fixed on the baffle 61. An elastic element 64 is provided on the mounting bracket 12 to keep the baffle 61 in a vertical position. The elastic element 64 includes a mounting rod 641 threaded to the limiting bracket 13 and a positioning spring 642 fixed to the mounting rod 641. The other end of the positioning spring 642 is fixed to the baffle 61, and the positioning spring 642 is located above the hinge axis of the baffle 61. The heavy gas trigger magnet 63 is located on the baffle 61 and below the hinge axis. On the side, when the oil in the transformer flows rapidly through the relay, the oil impacts the baffle 61, causing the baffle 61 to rotate against the tension of the positioning spring 642. When the baffle 61 rotates to the third set position, the heavy gas trigger magnet 63 acts on the heavy gas trigger switch 62, causing the heavy gas trigger switch 62 to connect and generate a corresponding heavy gas alarm signal. In actual use, the position of the mounting rod 641 relative to the limit frame 13 can be adjusted according to actual needs, the initial elastic force of the elastic element 64 can be adjusted, and the resistance that the oil needs to overcome when the baffle 61 rotates to the third set position can be adjusted. Furthermore, a corresponding scale can be set on the limit frame 13 to conveniently determine the adjustment distance of the mounting rod 641.

[0055] Additionally, refer to Figure 2 and Figure 5 A limiting bolt 142 is threaded onto the mounting plate 141. When the baffle 61 is rotated to the third set position, the lower side of the baffle 61 abuts against the end of the limiting bolt 142, which limits the rotation angle of the baffle 61, reduces the phenomenon of oil impacting the baffle 61 and causing the baffle 61 to hit the heavy gas trigger switch 62, reduces the problem of damage to the heavy gas trigger switch 62, and provides better protection for the components.

[0056] For the relay disclosed in this application embodiment, multiple terminals are fixed on the top cover 11. One end of the terminal is located inside the housing 1, and the other end extends through the top cover 11 to the outside of the housing 1. The reed switch and rheostat on the mounting bracket 12 are respectively fixed to the end of the terminal located inside the housing 1 by wires. The end of the terminal located outside the housing 1 is directly connected to the external data processing and display module 4 and other related electrical equipment. This makes it easier to realize the circuit connection of the gas relay. It does not require setting up a line to penetrate the housing of the relay, and it is not easy to have problems with liquid or gas leakage. The sealing performance is better. Moreover, since multiple terminals are all set on the top cover 11, when performing wiring operations, the top cover 11 can be directly removed from the housing 1 for operation. It is not easily restricted by space and the operation is more convenient.

[0057] The implementation principle of a digital gas relay in this application embodiment is as follows: The gas relay is installed between the transformer and the oil tank. In the initial state, the oil flows through the relay and fills the cavity inside the relay. When gas is generated due to a fault in the transformer or when a gas leak occurs, gas accumulates on the upper side of the relay cavity. As the liquid level drops, the float 21 moves the adjustment terminal 31 of the monitoring element 3. Through the connected detection circuit, the detected signal data is transmitted to the data processing and display module 4, which converts the corresponding circuit signal into data such as liquid level and gas volume. The data processing and display module 4 stores and displays the corresponding detection data, which allows for convenient access to the liquid level and gas volume data inside the relay at any time, making the monitoring of gas inside the relay more accurate and comprehensive. In addition, it allows for a direct view of the trend of gas volume change in the relay over time. This information can help determine the type of fault in the transformer, providing convenience for subsequent inspection and maintenance.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A digital gas relay, characterized by: The utility model relates to a kind of gas relay, including Shell (1), shell (1) upside is provided as opening, opening is provided with top cover (11) for sealing; Mounting bracket (12), fixed on the side of top cover (11) towards shell (1) inside; Upper detection mechanism (2), for detecting liquid level in shell (1), and when gas volume in shell (1) reaches first set value, alarm signal is sent;And Monitoring element (3); Wherein, the upper detection mechanism (2) includes upper float ball (21) hinged on mounting bracket (12) and upper trigger switch (22) arranged on mounting bracket (12), when gas volume in shell (1) reaches first set value, liquid level drives upper float ball (21) to be located at first set position, triggers upper trigger switch (22) to communicate and sends alarm signal; The monitoring element (3) is arranged on mounting bracket (12) and is connected with detection circuit, and monitoring element (3) includes adjusting terminal (31), adjusting terminal (31) is connected with upper float ball (21), and the movement of upper float ball (21) drives adjusting terminal (31) to move, adjusts the signal value output by monitoring element (3); The gas relay further includes baffle (61) hinged on mounting bracket (12) and heavy gas trigger switch (62) arranged on mounting bracket (12);The baffle (61) is perpendicular to the oil liquid path flowing through the gas relay, and the baffle (61) rotates to third set position in the direction away from transformer under the impact of oil liquid, triggers heavy gas trigger switch (62) to close;Heavy gas trigger switch (62) is connected with detection circuit and triggers corresponding alarm signal; There is elastic member (64) on mounting bracket (12), and elastic member (64) exerts elastic force on baffle (61) so that baffle (61) is in vertical state, and baffle (61) rotates to third set position by overcoming the elastic force of elastic member (64) under the impact of oil liquid.

2. A digital gas relay according to claim 1, characterized in that: The monitoring element (3) is a variable resistor, and the adjusting terminal (31) of the variable resistor is connected with the upper float ball (21), and the adjusting terminal (31) of the variable resistor is moved by the lifting of the upper float ball (21).

3. A digital gas relay according to claim 2, characterized in that: The upper float ball (21) is provided with connecting rod (23) at both ends, the connecting rod (23) is rotatably connected to the mounting bracket (12), the adjusting terminal (31) of the variable resistor is connected with the connecting rod (23), and is rotatably connected with the body of the variable resistor.

4. A digital gas relay according to claim 3, characterized in that: The upper trigger switch (22) is a reed switch, and the upper float ball (21) is fixed with upper trigger magnet (24) for triggering the reed switch to close.

5. A digital gas relay according to claim 3, characterized in that: The mounting bracket (12) is provided with limiting frame (13), and the upper float ball (21) abuts against the upper side of the limiting frame (13) to keep at the height of first set position.

6. A digital gas relay according to claim 1, characterized in that: The lower detection mechanism (5) is arranged on the lower side of the mounting frame (12), and the lower detection mechanism (5) comprises a lower floating ball (51) rotatably connected to the mounting frame (12) and a lower trigger switch (52) arranged on the mounting frame (12), and the lower trigger switch (52) is also connected with a detection circuit; the lower trigger switch (52) is communicated when the lower floating ball (51) descends to the second set position, and the lower trigger switch (52) sends a signal to the detection circuit to trigger an alarm signal.

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