A current transformer secondary circuit live warning unit and device

Abstract

The utility model discloses a current transformer secondary circuit live warning unit and device, including alternating current collection part, load resistance, rectification filter part and alarm part, alternating current collection part is connected with load resistance, the both ends of load resistance are connected with rectification filter part, rectification filter part is connected with alarm part, this scheme pincer current transformer is pressed on the secondary lead of current transformer, and its output end is connected to the both ends of load resistance respectively, and the both ends of load resistance are connected on rectification filter module respectively, and rectification filter module output end is connected on LED drive module again, can realize the red LED lamp and / or bee calling organ of current transformer secondary circuit live situation under the condition of lighting, and further play the function of live warning.

Description

Technical Field

[0001] This utility model belongs to the field of electrical engineering safety detection technology, and specifically relates to a live warning unit and device for the secondary circuit of a current transformer. Background Technology

[0002] In the power industry, data acquisition equipment used in electrical secondary systems such as relay protection, measurement, monitoring, and automation all collect AC current from the primary side of the electrical system through current transformers. During the operation and maintenance of electrical secondary equipment, it is common to perform maintenance on equipment while the current transformer is energized. Currently, the common safety measures to address this risk of live work are: first, seal the circuit test terminals on the secondary side of the current transformer closest to the transformer body; then, open the sealed test terminal connection piece, thus isolating the electrical secondary equipment to be maintained from the energized secondary side of the current transformer; finally, use red insulating tape at the sealed current circuit test terminals for insulation and warning isolation to prevent accidental contact with energized parts during maintenance. However, currently, the insulating tape is prone to peeling off during maintenance or its warning effect is not obvious, failing to provide a proper live-line warning. Maintenance personnel are easily prone to misoperation, leading to open circuits on the secondary side of the current transformer, resulting in equipment burnout or personal injury accidents. Utility Model Content

[0003] The purpose of this utility model is to provide a live warning unit and device for the secondary circuit of a current transformer, which addresses the above-mentioned shortcomings. This solves the problems in the prior art where the insulating tape is easy to fall off during maintenance or the warning effect is not obvious, thus failing to play the role of live warning and reminder. Furthermore, maintenance personnel are prone to misoperation, which can lead to open circuits on the secondary side of the current transformer, resulting in equipment burnout or personal injury accidents.

[0004] This utility model is achieved through the following solution:

[0005] A current transformer secondary circuit live warning device includes an AC current acquisition unit, a load resistor, a rectifier and filter unit, and an alarm unit; the AC current acquisition unit is connected to the load resistor, the two ends of the load resistor are connected to the rectifier and filter unit, and the rectifier and filter unit is connected to the alarm unit.

[0006] Based on the structure of the above-mentioned current transformer secondary circuit live warning unit, the AC current acquisition unit includes a clamp-on current transformer and a connecting line, and the clamp-on current transformer is connected to the circuit where the load resistor is located through the connecting line.

[0007] Based on the structure of the above-mentioned live warning unit for the secondary circuit of a current transformer, the connecting wire is made of soft copper wire with elasticity and extensibility.

[0008] Based on the structure of the above-mentioned live warning unit for the secondary circuit of a current transformer, the clamp-on current transformer is selected with a rated output current of 5mA and a transformation ratio of 1000 / 5. The load resistance is selected as 400Ω.

[0009] Based on the structure of the above-mentioned live warning unit for the secondary circuit of a current transformer, the rectifier and filter section includes a rectifier bridge and a filter capacitor, which are connected together.

[0010] Based on the structure of the above-mentioned live warning unit for the secondary circuit of a current transformer, the alarm unit includes a current-limiting resistor and an alarm unit, which are connected in series.

[0011] Based on the structure of the above-mentioned current transformer secondary circuit live warning unit, the alarm unit is a red LED light and / or a buzzer.

[0012] This solution provides a live warning device for the secondary circuit of a current transformer, including an integrated circuit board, a package box, and a warning unit. The load resistor, rectifier filter, and alarm unit in the warning unit are all mounted on the integrated circuit board. The package box is fitted onto the outside of the integrated circuit board, and the package box encloses the load resistor, rectifier filter, and alarm unit within it.

[0013] Based on the structure of the above-mentioned current transformer secondary circuit live warning device, the warning units are respectively a first warning unit, a second warning unit, and a third warning unit inside the package box; the first warning unit, the second warning unit, and the third warning unit are arranged in parallel, and each of the first warning unit, the second warning unit, and the third warning unit is provided with a clamp-on current transformer, which clamps the secondary leads of the three current transformers respectively.

[0014] Based on the structure of the above-mentioned current transformer secondary circuit live warning device, a strong magnet is provided at the bottom of the encapsulation box.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. In this solution, the AC power acquisition unit collects AC power from the secondary leads of the current transformer. The collected AC power is rectified by the load resistor and the rectifier filter before being sent to the alarm unit as DC power. Upon receiving the DC power, the alarm unit performs corresponding early warning processing. This solution effectively alerts maintenance personnel during the operation and maintenance of electrical secondary equipment, reminding them that the secondary side of the current transformer is in a live operating state. This prevents open circuits in the secondary side of the current transformer due to misoperation, ensuring reliable power supply and personal safety. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0018] Reference numerals in the attached diagram: 1. AC power acquisition unit; 2. Load resistor; 3. Rectifier and filter unit; 4. Alarm unit; 5. Current transformer; 6. Air switch; 7. Electrical secondary acquisition settings; 8. Encapsulation box; 9. Strong magnet; 11. Clamp-on current transformer; 12. Connecting wire. Detailed Implementation

[0019] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0020] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a predetermined orientation, or be constructed and operated in a predetermined orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0023] Example 1

[0024] like Figure 1 As shown, this utility model provides a technical solution:

[0025] A current transformer secondary circuit live warning unit includes, but is not limited to, an AC power acquisition unit 1, a load resistor 2, a rectifier and filter unit 3, and an alarm unit 4; the AC power acquisition unit 1 is connected to the load resistor 2, the two ends of the load resistor 2 are connected to the rectifier and filter unit 3, and the rectifier and filter unit 3 is connected to the alarm unit 4.

[0026] Based on the above structure, the AC power acquisition unit 1 is used to acquire the AC power from the secondary leads of the current transformer 5. The acquired AC power is rectified by the load resistor 2 and the rectifier filter unit 3 and then sent to the alarm unit 4 as DC power. Upon receiving the DC power, the alarm unit 4 performs corresponding early warning processing. This solution can effectively warn maintenance personnel that the secondary side of the current transformer 5 is in a live operating state during the operation and maintenance of electrical secondary equipment, thereby avoiding open circuit of the secondary side of the current transformer 5 due to misoperation, ensuring reliable power supply and personal safety.

[0027] As an example, the AC power acquisition unit may include a clamp-on current transformer 11 and a connecting line 12, with the clamp-on current transformer 11 connected to the circuit containing the load resistor via the connecting line 12.

[0028] The connecting wire 12 can be made of soft copper wire with elasticity and flexibility.

[0029] The clamp-on current transformer 11 is selected with a rated output current of 5mA and a transformation ratio of 1000 / 5. The load resistor 2 is selected as 400Ω.

[0030] Based on the above structure, the clamp-on current transformer 11 realizes the AC current induction of the secondary lead of the current transformer 5, providing a power supply basis for subsequent early warning operations; the clamp-on jaw can firmly clamp the conductor with a cross-sectional area of ​​less than 6 square millimeters.

[0031] As an example, the rectifier and filter unit 3 may include a rectifier bridge and a filter capacitor, which are connected together.

[0032] Based on the above structure, the AC voltage obtained by the clamp current transformer 11 and the load resistor 2 is converted into a stable DC voltage through the rectifier bridge and the filter capacitor.

[0033] As an example, the alarm unit 4 may include a current-limiting resistor and an alarm unit, which are connected in series.

[0034] The alarm unit can be a red LED light and / or a buzzer;

[0035] Based on the above structure, the current entering the alarm unit 4 is limited by a current-limiting resistor, so that it can be adapted to the alarm unit. The alarm unit can be a red LED light and / or a buzzer, which provides early warning through sound and light alarm.

[0036] Example 2

[0037] Based on the structure of Embodiment 1 above, as Figure 1 As shown, this utility model provides a technical solution:

[0038] A current transformer secondary circuit live warning device includes an integrated circuit board, a package box 8, and a warning unit; the load resistor 2, the rectifier filter 3, and the alarm unit 4 in the warning unit are all mounted on the integrated circuit board, and the package box 8 is sleeved on the outside of the integrated circuit board, and the package box 8 encloses the load resistor 2, the rectifier filter 3, and the alarm unit 4 within it.

[0039] Based on the above structure, an integrated circuit board is set up to provide a connection basis for electrical components, and a package box 8 is set up to protect the internal electrical components and avoid damage to the internal electronic components.

[0040] As an example, the warning units inside the package 8 are a first warning unit, a second warning unit, and a third warning unit, respectively. The first warning unit, the second warning unit, and the third warning unit are arranged in parallel, and each of the first warning unit, the second warning unit, and the third warning unit is provided with a clamp-on current transformer 11, which is clamped to the secondary leads of the three current transformers 5 respectively.

[0041] Based on the above structure, the secondary leads of the current transformer 5 are clamped by three sets of clamp-on current transformers 11, which can sense the current in each lead. If one of the warning units fails, the remaining warning units can still trigger an alarm. By working together with multiple warning units, the safety of power operation and maintenance can be further improved, and the adverse effects caused by occasional equipment failures can be avoided.

[0042] As an example, a strong magnet 9 can be installed at the bottom of the packaging box 8. This allows for easy installation and attachment to the equipment during maintenance, better serving as a warning and reminder.

[0043] As an example, the packaging box 8 is made of PVC material.

[0044] In this scheme, the clamp-on current transformer 11 is clamped onto the secondary lead of the current transformer 5, and its output terminal is connected to both ends of the load resistor 2. The two ends of the load resistor 2 are connected to the rectifier and filter module, and the output terminal of the rectifier and filter module is then connected to the LED driver module. This enables the red LED light and / or buzzer to be lit when the secondary circuit of the current transformer 5 is energized, thereby serving as an energized warning.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A live warning unit for the secondary circuit of a current transformer, characterized in that, It includes an AC power acquisition unit (1), a load resistor (2), a rectifier and filter unit (3), and an alarm unit (4); the AC power acquisition unit (1) is connected to the load resistor (2), the two ends of the load resistor (2) are connected to the rectifier and filter unit (3), and the rectifier and filter unit (3) is connected to the alarm unit (4).

2. The current transformer secondary circuit live warning unit according to claim 1, characterized in that: The AC power acquisition unit includes a clamp-on current transformer (11) and a connecting line (12). The clamp-on current transformer (11) is connected to the circuit where the load resistor is located through the connecting line (12).

3. The current transformer secondary circuit live warning unit according to claim 2, characterized in that: The connecting wire (12) is made of soft copper wire with elasticity and stretching function.

4. The current transformer secondary circuit live warning unit according to claim 3, characterized in that: The clamp-on current transformer (11) is selected with a rated output current of 5mA, a transformation ratio of 1000 / 5, and a load resistance (2) of 400Ω.

5. The current transformer secondary circuit live warning unit according to claim 4, characterized in that: The rectifier and filter section (3) includes a rectifier bridge and a filter capacitor, which are connected together.

6. The current transformer secondary circuit live warning unit according to claim 5, characterized in that: The alarm unit (4) includes a current-limiting resistor and an alarm unit, which are connected in series.

7. The current transformer secondary circuit live warning unit according to claim 6, characterized in that: The alarm unit is a red LED light and / or a buzzer.

8. A live warning device for the secondary circuit of a current transformer, characterized in that: It includes an integrated circuit board, a package (8), and a warning unit as described in any one of claims 1-7; the load resistor (2), the rectifier filter (3), and the alarm unit (4) in the warning unit are all disposed on the integrated circuit board, and the package (8) is sleeved on the outside of the integrated circuit board, and the package (8) encloses the load resistor (2), the rectifier filter (3), and the alarm unit (4) therein.

9. The current transformer secondary circuit live warning device according to claim 8, characterized in that: The warning units are respectively a first warning unit, a second warning unit and a third warning unit in the encapsulation box (8); the first warning unit, the second warning unit and the third warning unit are arranged in parallel, and each of the first warning unit, the second warning unit and the third warning unit is provided with a clamp-on current transformer (11), and the clamp-on current transformer (11) is clamped to the secondary leads of the three current transformers (5).

10. The current transformer secondary circuit live warning device according to claim 9, characterized in that: A strong magnet (9) is provided at the bottom of the packaging box (8).

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