Test wire device with detection function
By designing a test wire device with detection function, integrating CT wire and ground wire, equipped with a DC buzzer and fuse, the problem of cumbersome operation and safety hazards of multiple cables in electrical equipment tests is solved, and fast and safe grounding detection is achieved.
Patent Information
- Application Number
- CN202422022461.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-20
AI Technical Summary
The prior art requires carrying multiple test lines in electrical equipment testing, which are cumbersome and have safety hazards, especially in complex on-site conditions that are prone to errors.
A test wire device with detection function is designed, including a power connection device and a power test device. The CT wire and ground wire are integrated through the junction box, and equipped with a DC buzzer and a fuse to quickly detect the grounding condition, reduce operating steps and improve safety.
It simplifies the operation process, reduces the work burden of operators, improves the accuracy and safety of equipment grounding detection, and avoids misoperation and space occupation.
Smart Images
Figure CN223139813U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electrical testing, in particular to a test line device with a detection function. Background Art
[0002] In the operation and maintenance of power systems, to ensure the safety and reliability of electrical equipment, it is necessary to regularly conduct preventive tests on primary electrical equipment. Among them, current transformers (CTs), as key measurement and protection components, must be taken measures to prevent their secondary sides from opening during the test to avoid generating high voltages that may damage equipment or cause harm to operators.
[0003] Currently, the common practice is to use multiple test lines to short-circuit and ground each phase (such as phases A, B, C, and neutral point N) of the CT secondary side when conducting tests on primary electrical equipment. Although this method can meet the basic safety requirements, there are the following deficiencies in actual operation: 1. It is necessary to carry multiple test lines, increasing the workload of operators; 2. Each short-circuit requires manually connecting multiple cables, which is prone to errors and low in efficiency; 3. After the short-circuit is completed, additional detection equipment is required to confirm whether the wiring is correctly grounded, increasing additional operation steps; Therefore, the existing short-circuit and grounding methods are not only time-consuming and laborious but also have certain safety hazards. Especially in complex on-site conditions, improper operation may lead to serious consequences. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a test line device with a detection function, which can adopt a supporting power connection device and a voltage testing device to cooperate in short-circuiting and grounding the CT secondary side wiring, and can quickly detect whether the equipment is well grounded, ensuring good grounding and guaranteeing the safety of CT equipment.
[0005] To solve the above technical problems, the technical solution adopted by the utility model is:
[0006] A test line device with a detection function includes a power connection device and a voltage testing device. The power connection device includes a junction box. One side of the junction box is provided with a retractable CT wire that is sequentially connected to phases A, B, C, and N of the CT secondary side. The other side of the junction box is provided with a retractable grounding wire that is connected to the grounding system. The CT wires are connected in parallel inside the junction box and then connected in series with the grounding wire.
[0007] The voltage testing device includes a voltage testing box. A power supply and a DC buzzer are installed inside the voltage testing box. A first test pen and a second test pen are respectively connected to both sides of the voltage testing box. The first test pen, the power supply, the DC buzzer, and the second test pen are sequentially connected in series.
[0008] In a preferred solution, a first rotating shaft is vertically inserted into one side of the junction box. The first rotating shaft is movably connected to a rotating base at the bottom of the junction box and can rotate around its own axis. A first knob is installed at the end of the first rotating shaft. The CT wire is wound around the first rotating shaft for retracting and extending. One end of the CT wire is connected to a grounding wire, and the other end of the CT wire is provided with a secondary wiring head.
[0009] In a preferred solution, a second rotating shaft is vertically inserted into the other side of the junction box. The second rotating shaft is movably connected to a rotating base at the bottom of the junction box and can rotate around its own axis. A second knob is installed at the end of the second rotating shaft. The grounding wire is wound around the second rotating shaft for retracting and extending. One end of the grounding wire is connected to the CT wire, and the other end of the grounding wire is provided with a grounding wire head.
[0010] In a preferred solution, an inlet is provided on one side of the junction box. The CT wire passes through the inlet and is wound around the first rotating shaft. An outlet is provided on the other side of the junction box. The grounding wire passes through the inlet and is wound around the second rotating shaft.
[0011] In a preferred solution, the ends of the CT wire and the grounding wire are electrically connected to the rotating base, and the rotating bases are electrically connected through a busbar. A first switch is provided on the busbar.
[0012] In a preferred solution, a second switch and a fuse box are connected in series between the first wiring pen and the power supply. A fuse box is connected in series between the second wiring pen and the DC buzzer. A fusing fuse is installed in the fuse box.
[0013] A test wire device with a detection function has the following beneficial effects during use:
[0014] 1. This device can integrate the CT wire and the grounding wire through the wiring device, avoiding carrying multiple test wires during the test, thereby avoiding increasing the workload of the operator and reducing misoperations;
[0015] 2. The junction box can wind up the CT wire and the grounding wire through the winding device when the device is idle, avoiding the device occupying too much space and improving the compactness and flexibility of the device;
[0016] 3. The test device is equipped with a DC buzzer and a fuse, which can quickly detect the grounding condition of the equipment and effectively improve the safety during the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The following further describes the present invention in conjunction with the drawings and embodiments:
[0018] Figure 1 It is a top view of the junction box structure of the present invention;
[0019] Figure 2This is a cross-sectional view of the internal structure of the junction box of the present utility model in the flipped state;
[0020] Figure 3 This is a schematic diagram of the structure of the test device of the present utility model;
[0021] Figure 4 This is the schematic diagram of the circuit connection between each component.
[0022] In the figure: junction box 1, first rotating shaft 2, inlet 3, CT wire 4, secondary wiring head 5, first knob 6, first switch 7, second rotating shaft 8, second knob 9, ground wire 10, ground wire head 11, outlet 12, rotating base 13, wire row 14, test electric box 15, power supply 16, DC buzzer 17, fuse 18, first wiring pen 19, second wiring pen 20, second switch 21, fuse box 22. Specific embodiments
[0023] As Figure 1 and Figure 3 shown, a test line device with a detection function includes a power connection device and a test electric device. The power connection device includes a junction box 1. A retractable CT wire 4 is arranged on one side of the junction box 1 and is sequentially connected to the A, B, C, and N phases of the CT secondary side. A retractable ground wire 10 is arranged on the other side of the junction box 1 and is connected to the grounding system. The CT wires 4 are connected in parallel inside the junction box 1 and then connected in series with the ground wire 10;
[0024] The test electric device includes a test electric box 15. A power supply 16 and a DC buzzer 17 are installed inside the test electric box 15. A first wiring pen 19 and a second wiring pen 20 are respectively connected to both sides of the test electric box 15. The first wiring pen 19, the power supply 16, the DC buzzer 17, and the second wiring pen 20 are sequentially connected in series;
[0025] During the use of the device, the A, B, C, and N phases of the CT secondary side are connected through the CT wire, and then the ground wire 10 is connected to the grounding device. After closing the switch, the A, B, C, and N phases of the CT secondary side can be grounded. During measurement, the first wiring pen 19 is respectively connected to the A, B, C, and N phases of the CT secondary side, and the second wiring pen 20 is grounded. When the DC buzzer 17 sounds, it can prove that the phase is well grounded.
[0026] The preferred solution is as Figure 1 and Figure 2 shown. A first rotating shaft 2 is vertically inserted into one side of the junction box 1. The first rotating shaft 2 is movably connected to the rotating base 13 at the bottom of the junction box 1 and can rotate around its own axis. A first knob 6 is installed at the end of the first rotating shaft 2. The CT wire 4 is wound around the first rotating shaft 2 for retraction and extension. One end of the CT wire 4 is connected to the ground wire 10, and the other end of the CT wire 4 is provided with a secondary wiring head 5.
[0027] The preferred solution is as follows Figure 1 and Figure 2 As shown, a second rotating shaft 8 is vertically inserted into the other side of the junction box 1. The second rotating shaft 8 is movably connected to the rotating base 13 at the bottom of the junction box 1 and can rotate around its own axis. A second knob 9 is installed at the end of the second rotating shaft 8. The ground wire 10 is wound around the second rotating shaft 8 for retracting and extending. One end of the ground wire 10 is connected to the CT wire 4, and the other end of the ground wire 10 is provided with a ground wire head 11;
[0028] With the above structure, after the device finishes working, by rotating the first rotating shaft 2 and the second rotating shaft 8, the CT wire 4 and the ground wire 10 can be completely retracted into the junction box 1, avoiding the wiring device occupying too much space and improving the portability of the device at the same time.
[0029] The preferred solution is as follows Figure 1 and Figure 2 As shown, an inlet 3 is provided on one side of the junction box 1. The CT wire 4 passes through the inlet 3 and is wound around the first rotating shaft 2. An outlet 12 is provided on the other side of the junction box 1. The ground wire 10 passes through the inlet 3 and is wound around the second rotating shaft 8. When the CT wire 4 and the ground wire 10 are completely retracted, the secondary wiring head 5 and the ground wire head 11 can be simultaneously retracted into the box, leaving only their ends outside the box, which helps to pull out the CT wire 4 and the ground wire 10.
[0030] The preferred solution is as follows Figure 2 As shown, the ends of the CT wire 4 and the ground wire 10 are electrically connected to the rotating base 13, and the rotating bases 13 are electrically connected through a bus bar 14. A first switch 7 is provided on the bus bar 14;
[0031] With the above structure, one end of the CT wire 4 and the ground wire 10 can be kept connected, while the other end is retracted and extended along with the rotating shaft; when the first switch 7 is pressed, the corresponding circuit of the CT wire 4 is connected. When a certain phase on the secondary side of the CT is tested, the other phases are in a disconnected state to prevent errors.
[0032] The preferred solution is as follows Figure 2 As shown, a second switch 21 and a fuse box 22 are connected in series between the first wiring pen 19 and the power supply 16, and a fuse box 22 is connected in series between the second wiring pen 20 and the DC buzzer 17. A fusing fuse 18 is installed in the fuse box 22; when the DC buzzer 17 sounds, it means that the circuit is connected, and further means that the phase of the CT secondary side connected by the first wiring pen 19 at this time is well grounded. When the test current is too large, the fuse 18 immediately melts and disconnects the circuit to ensure the safety of the test process and improve the service life of the DC buzzer 17.
Claims
1. A test line device with a detection function, comprising a power connection device and a power testing device, characterized in that: The power connection device includes a junction box (1). On one side of the junction box (1), there is a retractable CT wire (4) which is sequentially connected to the secondary sides A, B, C, and N phases of the CT. On the other side of the junction box (1), there is a retractable ground wire (10) which is connected to the grounding system. The CT wire (4) is connected in parallel inside the junction box (1) and then connected in series with the ground wire (10). The power testing device includes a power testing box (15). Inside the power testing box (15), there is a power supply (16) and a DC buzzer (17). On both sides of the power testing box (15), there are respectively connected a first test pen (19) and a second test pen (20). The first test pen (19), the power supply (16), the DC buzzer (17), and the second test pen (20) are connected in series in sequence.
2. The test line device with a detection function according to claim 1, wherein: On one side of the junction box (1), there is a first rotating shaft (2) vertically inserted. The first rotating shaft (2) is movably connected to a rotating base (13) at the bottom of the junction box (1) and can rotate around its own axis. At the end of the first rotating shaft (2), there is a first knob (6). The CT wire (4) is wound around the first rotating shaft (2) for retracting and releasing. One end of the CT wire (4) is connected to the ground wire (10), and the other end of the CT wire (4) is provided with a secondary connection head (5).
3. The test line device with a detection function according to claim 1, characterized in that: On the other side of the junction box (1), there is a second rotating shaft (8) vertically inserted. The second rotating shaft (8) is movably connected to a rotating base (13) at the bottom of the junction box (1) and can rotate around its own axis. At the end of the second rotating shaft (8), there is a second knob (9). The ground wire (10) is wound around the second rotating shaft (8) for retracting and releasing. One end of the ground wire (10) is connected to the CT wire (4), and the other end of the ground wire (10) is provided with a ground wire head (11).
4. The test line device with a detection function according to claim 2 or 3, characterized in that: On one side of the junction box (1), there is an inlet (3). The CT wire (4) passes through the inlet (3) and then is wound around the first rotating shaft (2). On the other side of the junction box (1), there is an outlet (12). The ground wire (10) passes through the inlet (3) and then is wound around the second rotating shaft (8).
5. The test line device with a detection function according to claim 1, characterized in that: The ends of the CT wire (4) and the ground wire (10) are electrically connected to the rotating base (13). The rotating bases (13) are electrically connected through a bus bar (14), and a first switch (7) is arranged on the bus bar (14).
6. The test line device with a detection function according to claim 1, characterized in that: A second switch (21) and a fuse box (22) are connected in series between the first test pen (19) and the power supply (16). A fuse box (22) is connected in series between the second test pen (20) and the DC buzzer (17). The fuse box (22) is provided with a fusing fuse (18).