Low-voltage cable insulation test protection warning device

Abstract

The utility model discloses a low-voltage cable insulation test protection warning device, which is characterized in that a non-clamping end of a clamp is connected with a warning device through a short-circuit wire, and the short-circuit wire is slidably sleeved with a clamp insulation sleeve used for wrapping the clamp; the four warning devices are used for detecting four phase colors; each warning device is provided with a warning lamp and a dial switch, and an A-phase sensor, a B-phase sensor, a C-phase sensor and a D-phase sensor are arranged at the wire access end of each warning device at a time. One end of the warning device away from the short-circuit wire is connected with a grounding clamp through a ground wire; the device is convenient to insulate and shield, can effectively isolate a test cable from other electrified parts, guarantees the safety of a test process, has a detection function, can monitor whether the low-voltage cable is electrified or not in real time, is provided with a dial switch, enables inter-phase short circuit and ground discharge operation to be more convenient, simplifies the operation process, and improves the test efficiency. And the test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable maintenance protection technical field especially relates to a low voltage cable insulation test protection warning device. BACKGROUND

[0002] With the rapid development of China's economy, the demand for electricity is growing, and as an important part of power transmission, the load of low voltage cable is increasing. Under this background, the insulation performance of low voltage cable becomes a key factor to ensure the safe operation of power system. However, in the actual operation process, the insulation of low voltage cable is aging, damaged and other problems, which brings great hidden trouble to the stable operation of power system. Therefore, it is particularly important to carry out low voltage cable insulation test, which can timely find potential leakage and short circuit risk, and determine the fault type and find the fault point when fault occurs.

[0003] However, the laying position of low voltage cable is generally close to the user, and the end is mostly in the doorway. In the current low voltage cable insulation test process, the following problems exist: first, there are many people in the test site, and the risk of electric shock is high, which threatens the safety of the test personnel and the on-site pedestrians. Second, the passageway of the test site is narrow, and it is not convenient to take warning devices such as fences, which increases the difficulty of on-site safety management. Finally, after insulation bandaging, other phase short circuit operation is performed, which is complicated and easy to cause misoperation, affecting the accuracy of test results. In view of these problems, how to improve the efficiency and safety of low voltage cable insulation test has become a problem to be solved in the power industry.

[0004] Therefore, a low voltage cable insulation test protection warning device is proposed, which aims to provide a safer and more efficient solution for low voltage cable insulation test. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above problems existing in the prior art, the utility model provides a low voltage cable insulation test protection warning device.

[0006] The technical scheme of the utility model is as follows:

[0007] A low voltage cable insulation test protection warning device, comprising a clamp and a warning device, the non-clamping end of the clamp is connected with the warning device through a short circuit line, and a clamp insulation sleeve is slidably arranged on the short circuit line for covering the clamp; the warning device is provided with four pieces for four phase color detection; each warning device is provided with a warning lamp and a dial switch, and each warning device is respectively provided with an A phase sensor, a B phase sensor, a C phase sensor and a D phase sensor at the lead-in end; the end of the warning device away from the short circuit line is connected with a grounding clamp through a ground wire.

[0008] Preferably, a discharge resistor is arranged on the ground wire.

[0009] Preferably, the clamping section of the clamp fixes one end of the joint conductor, and the other end of the joint conductor is connected with the low-voltage cable head.

[0010] Preferably, each warning light displays yellow, green, red and blue in sequence when connected with the A-phase sensor, the B-phase sensor, the C-phase sensor and the D-phase sensor.

[0011] The utility model has the advantages of convenient insulation shielding, effective isolation of the test cable and other live parts, safety guarantee of the test process, real-time monitoring of the live or not of the low-voltage cable, immediate alarm to remind personnel, avoidance of the occurrence of misoperation, convenient phase-to-phase short-circuit and ground discharge operation, simplified operation process and improved test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the utility model.

[0013] The reference signs in the drawing represent:

[0014] 1, clamp; 2, clamp insulation sleeve; 3, short-circuit wire; 4, warning device; 5, warning light; 6, code dial switch; 7, ground wire; 8, discharge resistor; 9, grounding clamp; 10, low-voltage cable head; 11, A-phase sensor; 12, B-phase sensor; 13, C-phase sensor; 14, D-phase sensor. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0016] Referring to Figure 1 A low-voltage cable insulation test protection warning device, comprising a clamp 1 and a warning device 4, the non-clamping end of the clamp 1 is connected with the warning device 4 through a short-circuit wire 3, the clamp insulation sleeve 2 is slidably sleeved on the short-circuit wire 3 for covering the clamp 1, the clamp insulation sleeve 2 is sleeved on the short-circuit wire 3 and can completely wrap the clamp 1 on the wire, and has an insulation level of 1000V or above;

[0017] The warning device 4 is provided with four pieces for four phase color detections; each warning device 4 is provided with a warning lamp 5 and a dial switch 6, and each warning device 4 is respectively provided with an A-phase sensor 11, a B-phase sensor 12, a C-phase sensor 13 and a D-phase sensor 14 at a wire access end, when the residual voltage on the cable phase line is greater than 36V, the warning lamp is powered to flash and alarm; the warning device is provided with a built-in buzzer, when the residual voltage on the cable phase line is greater than 36V, the buzzer emits an alarm sound to indicate that there is electricity on the site; the warning device 4 is connected to the grounding clamp 9 through the ground wire 7 at the end far from the short circuit wire 3, and the ground wire 7 is provided with a discharge resistor 8 for reducing the current impact during discharge.

[0018] Further, the clamping section of the clamp 1 fixes one end of the connected wire, and the other end of the wire is connected to the low-voltage cable head 10.

[0019] Further, each warning lamp 5 displays yellow, green, red and blue in turn when connected to the A-phase sensor 11, the B-phase sensor 12, the C-phase sensor 13 and the D-phase sensor 14, and when the corresponding phase line is electrified, the corresponding phase color flashing light can be emitted.

[0020] The working principle of the utility model is as follows:

[0021] In the utility model, the non-clamping end of the clamp 1 is connected to the warning device 4 through the short circuit wire 3, the clamp 1 is covered by the clamp insulating sleeve 2 which is slidably arranged on the short circuit wire 3, the clamp insulating sleeve 2 is sleeved on the short circuit wire 3 and can completely wrap the clamp 1 on the wire, and the clamp 1 has an insulation level of 1000V or above;

[0022] The connection point of the low-voltage cable is removed to prepare for insulation testing, the low-voltage cable head 10 is confirmed to be de-energized by using a low-voltage test pen to ensure the safety of operation, then the four clamps 1 of the device are connected to the A, B, C and D phase lines respectively, the grounding clamp 9 is connected to the grounding point, the preliminary connection of the overall device is completed, the clamp insulating sleeve 2 of the clamp 1 is pushed to completely wrap the clamp 1 and the exposed part of the cable head, and insulation shielding is realized; next, the A-phase insulation test can be started: first, the dial switch 6 of the A-phase is dialled to the off position, the A-phase is isolated for testing, then the dial switches 6 of B, C and D are dialled to the on position to ensure that the other phase lines are short-circuited; then real-time monitoring and warning are carried out: the A-phase insulation resistance is tested at the other end, whether the warning lamp 5 is on and whether the warning device 4 emits an electrified alarm sound are observed to determine whether the cable is electrified, after the test is completed, the dial switch 6 of the A-phase is dialled to the on position, the cable is discharged, it is confirmed that the warning lamp 5 is off, which indicates that the A-phase cable is discharged; the above steps are repeated to carry out the insulation resistance test of the other phases in turn;

[0023] The warning device 4 is provided with four pieces for four phase color detection; each warning device 4 is provided with a warning light 5 and a dial switch 6, and each warning device 4 is respectively provided with an A phase sensor 11, a B phase sensor 12, a C phase sensor 13 and a D phase sensor 14 at the wire access end, when the residual voltage on the cable phase line is > 36V, the warning light is powered, and the warning light flashes to alarm; the warning device is provided with a built-in buzzer, when the residual voltage on the cable phase line is > 36V, the buzzer emits an alarm sound indicating that there is electricity on the site; the end of the warning device 4 away from the short circuit wire 3 is connected to the grounding clamp 9 through the ground wire 7, and the ground wire 7 is provided with a discharge resistor 8 for reducing the current impact when discharging.

[0024] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A low voltage cable insulation test protection warning device comprising a clamp (1) and a warning device (4), characterized in that: The non-gripping end of the clamp (1) is connected with the warning device (4) through a short-circuit wire (3), a clamp insulation sleeve (2) is slidably sleeved on the short-circuit wire (3) for covering the clamp (1); the warning device (4) is provided with four pieces for four-phase color detection; each warning device (4) is provided with a warning light (5) and a dial switch (6), and each warning device (4) is respectively provided with an A-phase sensor (11), a B-phase sensor (12), a C-phase sensor (13) and a D-phase sensor (14) at a lead wire access end; the end of the warning device (4) away from the short-circuit wire (3) is connected with a grounding clamp (9) through a ground wire (7).

2. A low voltage cable insulation test guard warning device according to claim 1, characterised in that: The ground wire (7) is provided with a discharge resistor (8).

3. A low voltage cable insulation test guard warning device according to claim 1, wherein: The gripping section of the clamp (1) fixes one end of the lead wire, and the other end of the lead wire is connected with a low-voltage cable head (10).

4. A low voltage cable insulation test shield warning device according to claim 1, wherein: Each of the warning lights (5) displays yellow, green, red and blue four colors in turn when the A-phase sensor (11), the B-phase sensor (12), the C-phase sensor (13) and the D-phase sensor (14) are connected.

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