Abnormity detection device for metering transformer
By designing a metering transformer abnormality detection device combining inverter and wiring device, the problem of variable ratio detection problems and high voltage safety hazards during the detection process is solved, and fast and safe variable ratio detection is achieved.
Patent Information
- Application Number
- CN202421349727.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-14
AI Technical Summary
The prior art is difficult to effectively detect the ratio of the metering transformer, and during the detection process, it is necessary to deal with voltages higher than the safety voltage of the human body, which poses safety risks.
A metering transformer abnormality detection device is designed, which converts the DC current of the battery into AC power through an inverter, and uses a wiring device and an ammeter to detect the current ratio of the transformer to determine whether there is an abnormality in its transformation ratio.
The rapid and safe detection of the ratio of the metering transformer is achieved, avoiding the risk of contacting high voltages, and ensuring the safety and accuracy of the detection process.
Smart Images
Figure CN222896257U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer detection equipment, in particular to a metering transformer abnormality detection device. Background Art
[0002] The transformer can convert large current on the primary side into small current on the secondary side. Therefore, after it is set in the AC circuit, it can measure current. Before using it, it is necessary to understand its transformation ratio to facilitate subsequent measurement operations. When its transformation ratio changes, it will cause errors in the final measurement value. For this reason, it is necessary to test its transformation ratio to ensure that its actual transformation ratio is the normal marked transformation ratio. In addition, since the transformation ratio of some transformers is large, it is necessary to use a voltage higher than the safe voltage for the human body. For this reason, it is necessary to avoid safety problems during the detection process. Utility Model Content
[0003] In order to solve the above-mentioned problem that in order to ensure that the metering value is normal, it is necessary to use equipment to detect the metering transformer ratio and avoid contact with higher voltage during use, the utility model provides a metering transformer abnormality detection device.
[0004] The technical solution of this utility model is as follows:
[0005] A metering transformer abnormality detection device comprises a storage battery, wherein the output end of the storage battery is connected to the input end of an inverter, and a second power supply line is arranged at the output end of the inverter, wherein the second power supply line is connected to the first power supply line through a connector, and the end of the first power supply line can be detached relative to the connector, the first power supply line can pass through the through hole of the metering transformer, and the end of the first power supply line away from the connector is connected to an AC load;
[0006] The invention also comprises an ammeter, wherein the ammeter is provided with a plurality of current wires, and ends of the current wires away from the ammeter can be clamped on the connection terminals of the metering transformer.
[0007] After the first power supply line passes through the metering transformer, it is normally connected to the second power supply line to form a complete loop so that the metering transformer can detect the current. After that, after the current of the metering transformer is detected by the ammeter, by comparing the ratio of the above currents, it can be detected whether there is any abnormality in the transformation ratio of the above metering transformer.
[0008] In order to facilitate the connection with the end of the metering transformer, one end of the current line is detachably connected to the ammeter, and the other end is provided with a wiring clamp.
[0009] The specific structure of the above-mentioned connector is that the connector includes an insulating shell, a connecting wire is arranged in the insulating shell, and both ends of the connecting wire are protruding relative to the insulating shell, and the first power supply line and the second power supply line are respectively connected to the two ends of the connecting wire.
[0010] The manner of realizing the detachable connection between the first power supply line and the connecting line is that a sleeve is provided at the end of the first power supply line away from the AC load, and the sleeve can be sleeved on the end of the connecting line.
[0011] For safety reasons, the insulating housing is connected to a rotating wiring board for damping rotation, and the end of the second power supply line away from the inverter is fixed on the rotating wiring board and can rotate with the rotating wiring board to contact the end of the connecting line. Power on and off can be achieved to ensure that the wiring operation of the first power supply line and the connecting line is safer.
[0012] For safety reasons, the insulating housing is provided with a groove, and the end of the connecting wire connected to the first power supply wire is arranged in the groove, and a movable isolation cover is arranged at the opening of the groove, and the isolation cover can cover the groove. Placing the live part in the isolation space can avoid accidental contact by personnel, which is safer.
[0013] For easy operation, the isolation cover can be pushed by the rotating wiring board, and can only cover the groove when the second power supply line and the connecting line are in conflict. After the power is turned on, the isolation cover can be closed synchronously, which is safer.
[0014] In order to avoid accidental contact with the first power supply line, the insulating housing is provided with a wire groove, and the width of the wire groove is the same as the diameter of the first power supply line, and the width of the wire groove is less than 5 mm. The width of the wire groove cannot be entered by fingers, which is safer.
[0015] As a preferred solution, the depth of the wire trough is greater than 15 mm.
[0016] As a preferred solution, the isolation cover is provided with a gap corresponding to the first power supply line, so as to facilitate the compression of the first power supply line.
[0017] The beneficial effects of the utility model are as follows: the utility model is a metering transformer abnormality detection device, which connects the first power supply line and the second power supply line through a connector, which can ensure the safety of the connection position, and the first power supply line is easy to disassemble and assemble relative to the connector, so the first power supply line can be quickly passed through the metering transformer and current detection can be performed, and the connection of the ammeter is also very convenient, and it is only necessary to clamp the wiring clamp at the end of the metering transformer, and there is no need to disassemble the previous wires, and the design of the above-mentioned connector can ensure that the wiring terminal is isolated after power is turned on to ensure safety, and during the disassembly process of the first power supply line, the power must be turned off in advance, which is very safe. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.
[0019] In the attached picture:
[0020] Figure 1 This is a schematic diagram of the circuit structure of the utility model;
[0021] Figure 2 This is a schematic diagram of the current detection structure of the utility model;
[0022] Figure 3 This is a schematic diagram of the wiring structure of the metering transformer of the utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the wiring device of the utility model;
[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the utility model wiring device (not powered);
[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the utility model wiring device (power on);
[0026] Figure 7 This is a schematic diagram of the top view of the wiring connector of the utility model (without power);
[0027] Figure 8 This is a schematic diagram of the top view of the wiring connector of the utility model (power on);
[0028] The components represented by the reference numerals in the figure are:
[0029] 1. Ammeter; 2. Current line; 3. Measuring transformer; 4. First power supply line; 5. Wiring connector; 51. Insulating shell; 511. Wire trough; 52. Connecting wire; 53. Isolation cover; 54. Rotating terminal block; 6. Second power supply line. DETAILED DESCRIPTION
[0030] like Figure 1-8A metering transformer abnormality detection device shown includes a battery, which is easy to carry and can supply power. Since the transformer can only be used in an AC circuit, the output end of the battery is connected to the input end of the inverter, and a second power supply line 6 is set at the output end of the inverter, that is, the inverter is required to convert DC power into AC power for power supply. At this time, it is only necessary to connect the AC load to form a complete AC circuit, so it is only necessary to pass the power supply line through the through hole of the metering transformer. In order to facilitate the threading action, the above-mentioned power supply line is divided into two sections, namely the first power supply line 4 and the second power supply line 6, and the second power supply line 6 is connected to the first power supply line 4 through the connector 5, and the end of the first power supply line 4 can be disassembled relative to the connector 5, so it is convenient to pass the first power supply line 4 through the through hole of the metering transformer 3. Finally, the end of the first power supply line 4 away from the connector 5 is connected to the AC load.
[0031] The circuit of the above device is as follows Figure 1 As shown, the battery can select a 48V power supply specification, and the above circuit includes a PWM control unit, a transformer, a first field effect transistor and a second field effect transistor, and for safety reasons, a fuse can also be set in the circuit. The 48V direct current can be inverted into 220V alternating current through the above structure. When the above alternating current is connected to a fixed alternating current load, the current is a constant value. Therefore, as long as the metering transformer is installed in the above circuit, the detected current value can be compared with the above constant value to calculate the transformation ratio. If the false touch is large, it can be determined that the metering transformer is abnormal and needs to be replaced.
[0032] like Figure 2 As shown, the ammeter 1 for detection needs to be provided with a plurality of terminals, and the ammeter 1 is provided with a plurality of current wires 2, and the end of the current wire 2 away from the ammeter 1 can be clamped on the terminal of the metering transformer 3, and in order to facilitate the connection with the end of the metering transformer 3, one end of the current wire 2 is detachably connected to the ammeter 1, and the other end is provided with a wiring clamp. The wiring clamp can be directly clamped on the wire connected to the metering transformer 3, or it can be directly clamped at the terminal position without removing the wire, so the connection is very convenient.
[0033] Afterwards, it is only necessary to pass the first power supply line 4 through the metering transformer 3 and then connect the second power supply line 6 normally to form a complete loop so that the metering transformer 3 can detect the current. After that, after detecting the current of the metering transformer 3 through the ammeter 1, by comparing the ratio of the above currents, it can be detected whether there is any abnormality in the transformation ratio of the above metering transformer 3.
[0034] Then, as a preferred implementation, in order to improve the safety of the above detection operation, as Figure 4-8As shown, the specific structure of the above-mentioned connector 5 is that the connector 5 includes an insulating shell 51. The existence of the insulating shell 51 is convenient for the staff to use. Then, a connecting wire 52 is arranged in the insulating shell 51, and both ends of the connecting wire 52 are protruding relative to the insulating shell 51. Except for the ends, the above-mentioned connecting wire 52 is arranged in the insulating shell 51 without any exposure to ensure safety. Then, the first power supply line 4 and the second power supply line 6 are respectively connected to the two ends of the connecting wire 52, and the connection method is not a simple bolt fixing, but it is necessary to ensure that it will not be exposed when the power is on.
[0035] The specific implementation method is, first, Figure 5 , 7 As shown, the way to achieve the detachable connection between the first power supply line 4 and the connecting line 52 is that a collar is provided at the end of the first power supply line 4 away from the AC load, and the collar can be sleeved on the end of the connecting line 52. After sleeved, it can ensure the interference connection, and can avoid relative separation under non-artificial circumstances, which is more stable.
[0036] Afterwards, for safety reasons, the insulating shell 51 is connected to a rotating terminal block 54 for damping rotation. After the damping rotation is connected, the second power line 6 can be rotated to any position and stop, so it is convenient to change its rotation state. Afterwards, the end of the second power line 6 away from the inverter is fixed on the rotating terminal block 54, so the position of the second power line 6 can be changed by rotating the rotating terminal block 54. To this end, it is only necessary to set the rotating terminal block 54 at the corresponding position, so that the end of the second power line 6 can be rotated with the rotating terminal block 54 to contact the end of the connecting line 52. It can realize power on and off, and in the above structure, the end of the connecting line 62 is set on the side of the insulating shell 51, and the end of the second power line 6 is set on the surface of the rotating terminal block 54 close to the insulating shell 51. Therefore, after the connection, Figure 6 , 8 As shown, it can ensure that the wiring operation between the first power supply line 4 and the connecting line 52 is safer, that is, there is no exposed structure.
[0037] On the basis of the above structure, in order to ensure that the connection between the first voltage line 4 and the connecting line 52 is safer, the insulating housing 51 is provided with a groove, and the end of the connecting line 52 connected to the first power supply line 4 is arranged in the groove, and a movable isolation cover 53 is provided at the opening of the groove, and the isolation cover 53 can cover the groove, such as Figure 6 , 8As shown, the live part is set in the isolation space, which can avoid accidental contact by personnel and is safer. And for the convenience of operation, the isolation cover 53 can be pushed by the rotating wiring board 54, and can only cover the groove when the second power supply line 6 conflicts with the connecting line 52. After the power is turned on, the isolation cover 53 can be closed synchronously, which is safer. When in use, it can ensure that the power is cut off when the first power supply line 4 is connected to the end of the connecting line 52, which is safer. When the power is on, the connection end of the first power supply line 4 can be covered and set in the groove, which is safer. In the process of disengaging the first power supply line 4 relative to the above-mentioned connecting line 52, once the isolation cover 53 is moved away, it can be ensured that it conflicts with the rotating wiring board 54 to rotate, thereby separating the contact between the second power supply line 6 and the connecting line 52, and then realizing power off.
[0038] In the above structure, the isolation cover 53 is provided with a gap corresponding to the first power supply line 4 , so as to facilitate the compression of the first power supply line 4 .
[0039] Finally, based on the above structure, in order to prevent the length of the exposed copper wire of the first power supply line 4 from being too long and unable to fully enter the groove, in this case, in order to avoid accidental contact with the first power supply line 4, the insulating housing 51 is provided with a wire groove 511, and the width of the wire groove 511 is the same as the diameter of the first power supply line 4, and the width of the wire groove 511 is less than 5mm. The width of the wire groove 511 is too wide to allow fingers to enter, which is safer. Accordingly, the depth of the wire groove 511 is greater than 15mm, which can also ensure that personnel can contact the exposed copper wire. When the length of the exposed copper wire is greater than the length of the wire groove 511, part of the copper wire needs to be cut off.
[0040] Different from Figure 5 , 6 The above function can also be achieved by rotating the connecting plate 54 from a numerical plane perpendicular to the direction extending from the end of the connecting line 52 as a rotation plane. Accordingly, the moving direction of the isolation cover 53 needs to be adaptively changed, and is not limited to the above two methods. There are many other methods to choose from, as long as the necessary purpose can be achieved.
Claims
1. A device for detecting abnormality of a metering transformer (3), characterized in that: The invention comprises a storage battery, wherein the output end of the storage battery is connected to the input end of the inverter, and a second power supply line (6) is arranged at the output end of the inverter, wherein the second power supply line (6) is connected to the first power supply line (4) through a connector (5), and the end of the first power supply line (4) can be detached relative to the connector (5), the first power supply line (4) can pass through the through hole of the metering transformer (3), and the end of the first power supply line (4) away from the connector (5) is connected to an AC load; It also comprises an ammeter (1), wherein the ammeter (1) is provided with a plurality of current wires (2), and the ends of the current wires (2) away from the ammeter (1) can be clamped on the connection terminals of the metering transformer (3).
2. A device for detecting abnormality of a metering transformer (3) according to claim 1, characterized in that: One end of the current wire (2) is detachably connected to the ammeter (1), and the other end is provided with a wiring clamp.
3. A device for detecting abnormality of a metering transformer (3) according to claim 1, characterized in that: The connector (5) comprises an insulating shell (51), a connecting wire (52) is arranged inside the insulating shell (51), and both ends of the connecting wire (52) are protruding relative to the insulating shell (51), and the first power supply line (4) and the second power supply line (6) are respectively connected to the two ends of the connecting wire (52).
4. A device for detecting abnormality of a metering transformer (3) according to claim 3, characterized in that: A sleeve is provided at the end of the first power supply line (4) away from the AC load, and the sleeve can be sleeved on the end of the connecting line (52).
5. A device for detecting abnormality of a metering transformer (3) according to claim 3, characterized in that: The insulating housing (51) is connected to a rotating wiring board (54) in a damped rotation manner, and the end of the second power supply line (6) away from the inverter is fixed to the rotating wiring board (54) and can rotate with the rotating wiring board (54) to contact the end of the connecting line (52).
6. A device for detecting abnormality of a metering transformer (3) according to claim 5, characterized in that: The insulating housing (51) is provided with a groove, and the end of the connecting line (52) connected to the first power supply line (4) is arranged in the groove, and a movable isolation cover (53) is arranged at the opening of the groove, and the isolation cover (53) can cover the groove.
7. A device for detecting abnormality of a metering transformer (3) according to claim 6, characterized in that: The isolation cover (53) can be pushed by the rotating wiring board (54) and can cover the groove only when the second power supply line (6) and the connecting line (52) are in conflict.
8. A device for detecting abnormality of a metering transformer (3) according to claim 3, characterized in that: The insulating housing (51) is provided with a wire groove (511), and the width of the wire groove (511) is the same as the diameter of the first power supply line (4), and the width of the wire groove (511) is less than 5 mm.
9. A device for detecting abnormality of a metering transformer (3) according to claim 8, characterized in that: The depth of the wire groove (511) is greater than 15 mm.
10. A device for detecting abnormality of a metering transformer (3) according to claim 6, characterized in that: The isolation cover (53) is provided with a clearance notch corresponding to the first power supply line (4).