Low-voltage leakage current monitoring and early warning device
By using detectors A and B to form forward and reverse detection circuits in the low-voltage leakage current monitoring and early warning device, the problems of lack of circuit structure and detection accuracy in existing devices are solved, and rapid and accurate leakage information acquisition and improved detection accuracy are achieved.
Patent Information
- Application Number
- CN202520216202.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing low-voltage leakage current monitoring and early warning devices lack clear circuit structure descriptions and cannot verify the accuracy of the detection circuit.
Detector A and detector B are used to form forward and reverse detection circuits. The current values are compared by a comparison circuit, the signal is transmitted to a remote terminal by a wireless transmission chip, and the device is fixed to the electrical appliance under test by a clamp and a double-headed reverse screw.
It enables rapid and accurate acquisition of leakage current information, improves detection precision and accuracy, and ensures the reliability of leakage current detection.
Smart Images
Figure CN223650649U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of current monitoring and early warning devices, specifically a low-voltage leakage current monitoring and early warning device. Background Technology
[0002] Patent CN208636389U proposes a low-voltage leakage current monitoring and early warning device, including an electric shock early warning terminal, an electric shock early warning gateway, and a current sensor. The input terminal of the current sensor is connected to the current output terminal of the power distribution equipment, and the output terminal of the current sensor is connected to the input terminal of the electric shock early warning terminal. The output terminal of the electric shock early warning terminal is connected to the input terminal of the electric shock early warning gateway, and the output terminal of the electric shock early warning gateway is connected to a management terminal. Analysis reveals the following shortcomings of this low-voltage leakage current monitoring and early warning device: First, it does not clearly describe the specific structure and wiring of the circuit; second, it cannot verify the accuracy of the detection circuit. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this invention provides a low-voltage leakage current monitoring and early warning device, which solves the problems mentioned in the background section.
[0005] (II) Technical Solution
[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0007] A low-voltage leakage current monitoring and early warning device includes a device housing and a device under test. A detector A is fixed to the left side of the bottom surface of the inner cavity of the device housing, and a detector B is fixed to the right side of the bottom surface of the inner cavity of the device housing. A comparison circuit is fixed to the middle of the bottom surface of the inner cavity of the device housing. Detector A and detector B are of the same specifications. Detector A is connected in series to one port of the device under test, and detector B is connected in series to the other port of the device under test. The output terminals of detector A and detector B are electrically connected to the input terminal of the comparison circuit. The two ends of detector A are port a+ and port a-, the two ends of detector B are port b+ and port b-, and the two ends of the device under test are port c+ and port c-. The detectors A, detector B, and the device under test are connected in a circuit sequence to form a forward detection circuit and a reverse detection circuit.
[0008] Furthermore, the forward detection circuit is as follows: the current is connected to the input terminal of the electrical appliance under test through port a-, port a+ and port c+ in sequence, and then output through port c-, port b+ and port b-.
[0009] Furthermore, the reverse detection circuit is as follows: the current is connected to the input terminal of the device under test through port b+, port b- and port c+ in sequence, and then output through port c-, port a- and port a+.
[0010] Furthermore, ports a+ and a-, ports b+ and b-, and ports c+ and c- are all quick-connect ports of the same specification.
[0011] Furthermore, a wireless transmission chip is fixedly provided at the output end of the comparison circuit, and the comparison circuit transmits signals to the remote terminal through the wireless transmission chip.
[0012] Furthermore, clamps are movably fitted at both ends of the top surface of the device housing via guide rails, and the two clamps are connected by a double-headed reverse screw thread.
[0013] (III) Beneficial Effects
[0014] Compared with the prior art, this utility model provides a low-voltage leakage current monitoring and early warning device, which has the following beneficial effects:
[0015] In this invention, the current sequentially passes through detector A to detect the input current of the electrical appliance under test. Detector A transmits the detected current value to the comparison circuit. At the same time, detector B detects the output current of the electrical appliance under test and also transmits the detected current value to the comparison circuit. The comparison circuit compares the two current values to quickly and accurately obtain leakage current information.
[0016] This invention constructs a forward detection circuit and a reverse detection circuit by changing the connection order of detector A, detector B and the electrical circuit under test. The forward detection circuit and the reverse detection circuit can be compared and corrected to improve the detection accuracy and precision. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the forward circuit current of this utility model;
[0019] Figure 3 This is a schematic diagram of the reverse circuit current of this utility model.
[0020] In the diagram: 1. Device housing; 2. Detector A; 3. Detector B; 4. Comparison circuit; 5. Electrical appliance under test; 6. Wireless transmission chip; 7. Fixture; 8. Double-ended reverse lead screw; 21. Port a+; 22. Port a-; 31. Port b+; 32. Port b-; 51. Port c+; 52. Port c-. Detailed Implementation
[0021] 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.
[0022] Example
[0023] like Figure 1 , 2 As shown in Figure 3, an embodiment of this utility model proposes a low-voltage leakage current monitoring and early warning device, including a device housing 1 and a device under test 5. A detector A2 is fixed on the left side of the bottom surface of the inner cavity of the device housing 1, and a detector B3 is fixed on the right side of the bottom surface of the inner cavity of the device housing 1. A comparison circuit 4 is fixed in the middle of the bottom surface of the inner cavity of the device housing 1. Detectors A2 and B3 are of the same specifications. Detector A2 is connected in series to one port of the device under test 5, and detector B3 is connected in series to the other port of the device under test 5. The output terminals of detectors A2 and B3 are electrically connected to the input terminal of the comparison circuit 4. The two ends of detector A2 are port a+21 and port a-22, the two ends of detector B3 are port b+31 and port b-32, and the two ends of device under test 5 are port c+51 and port c-52. The detectors A2, B3, and device under test 5 are connected in a circuit sequence to form a forward detection circuit and a reverse detection circuit.
[0024] Furthermore, the forward detection circuit is as follows: the current is connected to the input terminal of the electrical appliance under test 5 through port a-22, port a+21 and port c+51 in sequence, and then output through port c-52, port b+31 and port b-32.
[0025] like Figure 2 As shown, when the forward detection circuit is working, the current passes through detector A2 to detect the input current of the device under test 5. Detector A2 transmits the detected current value to the comparison circuit 4. At the same time, detector B3 detects the output current of the device under test 5 and also transmits the detected current value to the comparison circuit 4. The comparison circuit 4 compares the two current values. If the comparison value is within the set error range, it is considered normal. If the comparison value is greater than the set error, it indicates that there is leakage current, and an alarm message is issued at this time.
[0026] Furthermore, the reverse detection circuit is as follows: the current is connected to the input terminal of the electrical appliance under test 5 through port b+31, port b-32 and port c+51 in sequence, and then output through port c-52, port a-22 and port a+21.
[0027] like Figure 3As shown, if the leakage signal detected by the forward detection circuit is uncertain, the above electrical connection can be made through the wire. At this time, detector B3 detects the current at the input terminal of the device under test 5, and detector A2 detects the current at the output terminal of the device under test 5. If the leakage current detected at this time is consistent with the result of the forward detection circuit, it indicates that leakage has indeed occurred at both ends of the device under test 5. Therefore, the forward detection circuit and the reverse detection circuit can be compared and corrected to improve the detection accuracy and precision.
[0028] Furthermore, ports a+21 and a-22, ports b+31 and b-32, and ports c+51 and c-52 are all quick-connect ports of the same specifications.
[0029] This allows the wires to be quickly connected to form a detection circuit at the aforementioned ports, enabling forward and reverse detection of both ends of the electrical appliance 5 under test.
[0030] Furthermore, a wireless transmission chip 6 is fixedly provided at the output end of the comparison circuit 4, and the comparison circuit 4 transmits signals to the remote terminal through the wireless transmission chip 6.
[0031] If the comparison value in the comparison circuit 4 is greater than the set error, it indicates that there is leakage. At this time, an alarm message is issued and transmitted to the remote terminal through the wireless transmission chip 6.
[0032] Furthermore, clamps 7 are movably fitted at both ends of the top surface of the device box 1 via guide rails, and the two clamps 7 are connected by a double-headed reverse screw 8.
[0033] Therefore, by turning the double-headed reverse screw 8, the two clamps 7 can be brought closer together, and the device box 1, detector A2, detector B3 and comparison circuit 4 can be fixed on the electrical appliance under test 5. Then the above-mentioned forward detection circuit and reverse detection circuit can be performed.
[0034] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A low-voltage leakage current monitoring and early warning device, comprising a device housing (1) and an electrical appliance under test (5), characterized in that: A detector A (2) is fixed on the left side of the bottom surface of the inner cavity of the device housing (1), and a detector B (3) is fixed on the right side of the bottom surface of the inner cavity of the device housing (1). A comparison circuit (4) is fixed in the middle of the bottom surface of the inner cavity of the device housing (1). The detectors A (2) and B (3) are of the same specification. The detector A (2) is connected in series to one port of the electrical appliance under test (5), and the detector B (3) is connected in series to the other port of the electrical appliance under test (5). The output terminal of the detector A (2) is connected to the output terminal of the detector B (3). The output terminals of the detectors are electrically connected to the input terminals of the comparison circuit (4); the two ends of the detector A (2) are port a+ (21) and port a- (22), the two ends of the detector B (3) are port b+ (31) and port b- (32), and the two ends of the electrical appliance under test (5) are port c+ (51) and port c- (52). The detectors A (2), B (3) and the electrical appliance under test (5) are connected in sequence to form a forward detection circuit and a reverse detection circuit.
2. The low-voltage leakage current monitoring and early warning device according to claim 1, characterized in that: The forward detection circuit is as follows: the current is connected to the input terminal of the electrical appliance under test (5) through port a-(22), port a+(21) and port c+(51) in sequence, and then output through port c-(52), port b+(31) and port b-(32).
3. The low-voltage leakage current monitoring and early warning device according to claim 1, characterized in that: The reverse detection circuit is as follows: the current is connected to the input terminal of the electrical appliance under test (5) through port b+ (31), port b- (32) and port c+ (51) in sequence, and then output through port c- (52), port a- (22) and port a+ (21).
4. The low-voltage leakage current monitoring and early warning device according to claim 1, characterized in that: Ports a+(21) and a-(22), ports b+(31) and b-(32), and ports c+(51) and c-(52) are all quick-connect ports of the same specifications.
5. A low-voltage leakage current monitoring and early warning device according to claim 1, characterized in that: The output terminal of the comparison circuit (4) is fixedly equipped with a wireless transmission chip (6), and the comparison circuit (4) transmits signals to the remote terminal through the wireless transmission chip (6).
6. The low-voltage leakage current monitoring and early warning device according to claim 1, characterized in that: The top surfaces of the device housing (1) are fitted with clamps (7) via guide rails, and the two clamps (7) are connected by a double-headed reverse screw (8).