Transformer substation transformer grounding current monitoring device

Abstract

The utility model relates to the technical field of transformer grounding current monitoring, and particularly discloses a transformer substation transformer grounding current monitoring device which comprises a fixing plate frame, a device shell is fixed on the side wall of the fixing plate frame through screws, and a monitoring mechanism used for monitoring transformer grounding current is arranged on the left side of the fixing plate frame. A cooling mechanism for cooling the monitoring mechanism is arranged in the device shell; the monitoring mechanism comprises a sensor body, the sensor body is fixed to the left side of the fixing plate frame, the side wall of the sensor body is connected with a limiting piece, and a heat dissipation piece is fixed to the outer wall of the limiting piece. Through the arranged monitoring mechanism, the grounding current of the transformer can be monitored, the monitored cable can be limited, the falling condition is reduced, the sensor body does not need to be assembled from one end of the cable and can be assembled at any displacement of the cable, and the practicability is improved.

Description

Technical Field

[0001] This utility model relates to the field of transformer grounding current monitoring technology, and in particular to a substation transformer grounding current monitoring device. Background Technology

[0002] A transformer core grounding current online monitoring system is a device used to monitor the grounding current of power transformer cores in real time. It is of great significance for assessing the transformer's operating status, detecting potential faults, and ensuring the safe operation of the power system. During transformer operation, changes in magnetic flux generate alternating magnetic flux in the core, inducing a current between the core and ground. This current is usually small, but if a fault exists, such as insulation aging or cracks, the core grounding current will increase significantly. The online monitoring system detects this grounding current in real time through sensors or detection windings and converts it into an electrical signal for subsequent processing and analysis.

[0003] Existing sensing systems have short lifespans, and because sensing devices need to operate in outdoor environments for extended periods, the failure rate of sensors is high.

[0004] An existing patent (publication number: CN206818777U) discloses a main transformer core grounding current monitoring device. The main transformer core grounding current monitoring device collects the current signal in the grounding conductor of the main transformer core through a magnetoresistive sensor, and after processing by a signal processing unit, it is sent to a remote monitoring center by a LoRa wireless communication module; remotely monitors the grounding fault of the main transformer, effectively prevents the grounding fault of the main transformer, and realizes an intelligent unmanned substation.

[0005] To address the aforementioned issues, while existing patents offer solutions that enable remote monitoring of grounding faults in the main transformer, effectively preventing such faults and achieving intelligent unmanned substations, their sensors are integrated circular structures. This requires passing one end of a wire through the sensor during assembly, and placing the sensor at a distance from the end of the wire, making assembly quite cumbersome. Summary of the Invention

[0006] The purpose of this utility model is to provide a substation transformer grounding current monitoring device that can monitor the grounding current of the transformer and limit the monitoring cable to reduce the occurrence of detachment. Furthermore, the sensor body does not need to be assembled from one end of the cable and can be assembled at any displacement of the cable, thereby improving its practicality and solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a substation transformer grounding current monitoring device, comprising a fixed plate frame, wherein a device housing is fixed to the side wall of the fixed plate frame by screws, a monitoring mechanism for monitoring transformer grounding current is provided on the left side of the fixed plate frame, and a cooling mechanism for cooling the monitoring mechanism is provided inside the device housing;

[0008] The monitoring mechanism includes a sensor body, which is fixed on the left side of a fixed plate frame. A limiting component is connected to the side wall of the sensor body, and a heat sink is fixed to the outer wall of the limiting component. Connecting blocks are fixed to both ends of the heat sink, and a connecting slot opened on the sensor body is inserted into one side of the connecting block.

[0009] Preferably, the upper surface of the connecting block is provided with a fixing hole, and a limiting rod that penetrates the connecting groove is inserted into the inner wall of the fixing hole.

[0010] Preferably, a fixing block is fixed to the outer surface of the limiting rod, and a spring sleeved on the limiting rod is connected to the upper surface of the fixing block.

[0011] Preferably, four fixing bolts are symmetrically installed inside the fixing plate frame.

[0012] Preferably, the cooling mechanism includes a water tank, which is fixed inside the device housing, and a submersible pump is fixed to the inner wall of the water tank by screws.

[0013] Preferably, the output end of the submersible pump is connected to a delivery pipe, the end of the delivery pipe is connected to a flow cavity opened inside the heat sink, and the outer wall of the heat sink is provided with a return pipe that is connected to the water storage tank.

[0014] Preferably, a plurality of heat pipes are installed at the lower end of the interior of the water storage tank, and the ends of the heat pipes are fixed with heat dissipation fins through the outer wall of the water storage tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The monitoring mechanism can monitor the grounding current of the transformer and limit the monitoring cable to reduce the possibility of it falling off. The sensor body does not need to be assembled from one end of the cable and can be assembled at any displacement of the cable, which improves its practicality.

[0017] 2. The cooling mechanism can absorb the heat generated by the connecting block and sensor body during operation, and then circulate it into the water tank through the return pipe. The heat pipe can absorb the heat of the cooling water and transfer the heat to the external heat dissipation fins, thereby expanding the heat dissipation effect of the heat dissipation fins and playing an auxiliary role in cooling the water. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the sensor body of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of A in the middle;

[0022] Figure 4 This is a half-sectional structural diagram of the water storage tank of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Fixed plate frame; 2. Device housing; 3. Sensor body; 31. Limiting component; 32. Heat sink; 33. Connecting block; 34. Connecting groove; 35. Limiting rod; 36. Fixing block; 37. Spring; 38. Fixing hole; 4. Fixing bolt; 5. Water tank; 51. Submersible pump; 52. Delivery pipe; 53. Return pipe; 54. Flow chamber; 55. Heat pipe; 56. Heat dissipation fins. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] Please see Figures 1 to 4 A substation transformer grounding current monitoring device includes a fixed plate frame 1, a device housing 2 fixed to the side wall of the fixed plate frame 1 by screws, a monitoring mechanism for monitoring transformer grounding current is provided on the left side of the fixed plate frame 1, and a cooling mechanism for cooling the monitoring mechanism is provided inside the device housing 2.

[0028] The monitoring mechanism includes a sensor body 3, which is fixed on the left side of the fixed plate frame 1. A limiting member 31 is connected to the side wall of the sensor body 3. A heat sink 32 is fixed to the outer wall of the limiting member 31. Connecting blocks 33 are fixed to both ends of the heat sink 32. A connecting groove 34 opened on the sensor body 3 is inserted into one side of the connecting block 33. A fixing hole 38 is opened on the upper surface of the connecting block 33. A limiting rod 35 that passes through the connecting groove 34 is inserted into the inner wall of the fixing hole 38. A fixing block 36 is fixed to the outer surface of the limiting rod 35. A spring 37 sleeved on the limiting rod 35 is abutted to the upper surface of the fixing block 36. Four fixing bolts 4 are symmetrically installed inside the fixed plate frame 1.

[0029] By adopting the above technical solution, the sensor body 3 is set as the front-end sensor, which is directly fitted onto the grounding lead of the transformer core (or clamped onto the grounding flat steel, cable, etc.). It measures the grounding current of the core through the principle of electromagnetic induction, converting the large current into a small current signal (or the current signal into a voltage signal) for subsequent circuit processing. The subsequent circuit includes signal acquisition and processing circuits, which contain high-precision analog circuits and digital signal processors (DSPs) or microcontrollers (MCUs). The analog circuits are responsible for amplifying and filtering the current signal (or voltage signal) output by the transformer. The DSP / MCU is responsible for converting the analog signal into a digital signal and performing further algorithmic processing, such as digital filtering and data calibration, to ensure the accuracy and reliability of the measurement data. Therefore, the specific monitoring process is based on existing technical solutions and will not be detailed here. During use, the fixing frame 1 is placed in a suitable position, and tools are used to... Tightening the fixing bolts 4 secures the mounting plate 1, reducing the possibility of displacement. The cable to be monitored is placed inside the sensor body 3. The limiting member 31 is then connected to the sensor body 3. The limiting member 31 is positioned by aligning the connecting block 33 on the heat sink 32 with the connecting groove 34 on the sensor body 3. During assembly, the upper limit rod 35 of the sensor body 3 is manually pulled vertically, causing the fixing block 36 to compress the spring 37. The connecting block 33 is then fully pushed into the connecting groove 34. The limiting rod 35 is then released, and the spring 37's elasticity causes it to reset, allowing the end of the limiting rod 35 to insert into the fixing hole 38 on the connecting block 33, thus securing the limiting member 31. This effectively limits the monitoring cable, reducing the risk of it falling off. Furthermore, the sensor does not require assembly from one end of the cable; it can be assembled at any point along the cable, improving practicality.

[0030] Specifically, such as Figure 1 , Figure 2 and Figure 4As shown, the temperature control mechanism includes a water tank 5, which is fixed inside the outer casing 2 of the device. A submersible pump 51 is fixed to the inner wall of the water tank 5 by screws. The output end of the submersible pump 51 is connected to a delivery pipe 52. The end of the delivery pipe 52 is connected to a flow cavity 54 opened inside the heat sink 32. The outer wall of the heat sink 32 is provided with a return pipe 53 that is connected to the water tank 5. Several heat pipes 55 are installed at the lower end inside the water tank 5. The ends of the heat pipes 55 penetrate the outer wall of the water tank 5 and are fixed with heat dissipation fins 56.

[0031] By adopting the above technical solution, the submersible pump 51 in the water storage tank 5 can draw out the cooling water and send it to the flow chamber 54 in the heat sink 32 through the delivery pipe 52. Since the heat sink 32 can absorb the heat generated by the connecting block 33 and the sensor body 3 during operation, the cooling water cools the heat sink 32. Then, it enters the water storage tank 5 through the return pipe 53 for circulation. The heat pipe 55 can absorb the heat of the cooling water and transfer the heat to the external heat dissipation fins 56, so that the heat dissipation fins 56 can expand the heat dissipation effect, thereby playing an auxiliary role in cooling the cooling water.

[0032] Working principle: The sensor body 3 is a front-end sensor that is directly fitted onto the grounding lead of the transformer core (or clamped onto the grounding flat steel, cable, etc.). It measures the grounding current of the core through electromagnetic induction, converting a large current into a small current signal (or a current signal into a voltage signal) for subsequent circuit processing, thereby monitoring the transformer grounding current. The limiting component 31 is then connected to the sensor body 3. The connecting block 33 on the heat sink 32 is aligned with the connecting slot 34 on the sensor body 3 to limit the assembly of the limiting component 31. Manually pulling the upper limit rod 35 of the sensor body 3 vertically causes the fixing block 36 to compress the spring 37, thus limiting the connection block 33. The limiting rod 35 is fully pushed into the connecting groove 34 and released. Under the elasticity of the spring 37, the limiting rod 35 is reset, so that the end of the limiting rod 35 is inserted into the fixing hole 38 on the connecting block 33, thereby fixing the limiting member 31 and limiting the monitoring cable. The submersible pump 51 in the water tank 5 can draw out the cooling water and send it to the flow chamber 54 in the heat sink 32 through the delivery pipe 52. Since the heat sink 32 can absorb the heat generated by the connecting block 33 and the sensor body 3 during operation, the cooling water cools the heat sink 32 and then enters the water tank 5 through the return pipe 53 for circulation. The heat pipe 55 can absorb the heat of the cooling water and transfer the heat to the external heat sink fins 56.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A substation transformer grounding current monitoring device, comprising a fixed frame (1), characterized in that: The side wall of the fixed plate frame (1) is fixed with a device housing (2) by screws. The left side of the fixed plate frame (1) is provided with a monitoring mechanism for monitoring the grounding current of the transformer. The inside of the device housing (2) is provided with a cooling mechanism for cooling the monitoring mechanism. The monitoring mechanism includes a sensor body (3), which is fixed on the left side of the fixed plate frame (1). A limiting member (31) is connected to the side wall of the sensor body (3). A heat sink (32) is fixed to the outer wall of the limiting member (31). A connecting block (33) is fixed to both ends of the heat sink (32). A connecting groove (34) opened on the sensor body (3) is inserted into one side of the connecting block (33).

2. The substation transformer grounding current monitoring device according to claim 1, characterized in that: The upper surface of the connecting block (33) is provided with a fixing hole (38), and a limiting rod (35) that penetrates the connecting groove (34) is inserted into the inner wall of the fixing hole (38).

3. The substation transformer grounding current monitoring device according to claim 2, characterized in that: A fixing block (36) is fixed to the outer surface of the limiting rod (35), and a spring (37) sleeved on the limiting rod (35) is connected to the upper surface of the fixing block (36).

4. The substation transformer grounding current monitoring device according to claim 1, characterized in that: The fixed plate frame (1) is symmetrically equipped with four fixing bolts (4).

5. A substation transformer grounding current monitoring device according to claim 4, characterized in that: The cooling mechanism includes a water tank (5), which is fixed inside the outer casing (2) of the device. A submersible pump (51) is fixed to the inner wall of the water tank (5) by screws.

6. A substation transformer grounding current monitoring device according to claim 5, characterized in that: The output end of the submersible pump (51) is connected to a delivery pipe (52), and the end of the delivery pipe (52) is connected to a flow cavity (54) opened inside the heat sink (32). The outer wall of the heat sink (32) is provided with a return pipe (53) that is connected to the water storage tank (5).

7. A substation transformer grounding current monitoring device according to claim 6, characterized in that: The lower end of the water storage tank (5) is equipped with several heat pipes (55), and the ends of the heat pipes (55) are fixed with heat dissipation fins (56) through the outer wall of the water storage tank (5).

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