Multi-channel mining cable insulation comprehensive monitoring and fault positioning terminal

Abstract

The utility model relates to the cable monitoring field, and discloses a multipath mining cable insulation comprehensive monitoring and fault positioning terminal comprising a three-core cable outer sheath, two ends of the three-core cable outer sheath are respectively provided with a grounding pipe, the interior of each grounding pipe is provided with a grounding wire, and the outer wall of each grounding wire is sleeved with a grounding circulation sensor. According to the utility model, when partial discharge occurs in the cable, charge movement is caused, the moving charge can generate pulse current in a peripheral measurement loop and reaches the ground through a grounding wire, and the micro current can be sensed through the grounding circulating current sensor, so that the partial discharge can be monitored; and the grounding circulating current sensor directly passes through the grounding wires at the two ends of the cable in an open manner, electrical contact is avoided, the installation is convenient, the reliability is high, and high-frequency pulse current can be sensed through the arranged partial discharge mutual inductor, so that fault positioning can be carried out by judging the propagation time of fault traveling waves.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable monitoring field especially relates to a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal. BACKGROUND

[0002] In recent years, crosslinked polyethylene cable gradually becomes the mainstream of coal mine high-voltage power supply system cable network development due to the advantages of simple operation and maintenance, high temperature resistance and excellent insulation performance, etc., since insulation defects are inevitably generated in the production, transportation, installation and operation process of cable, which leads to partial discharge in operation and becomes the hidden danger of safe operation of cable, so cable monitoring device is needed to detect and locate the fault of cable, so as to avoid more loss.

[0003] Traditional monitoring technology is to measure the insulation resistance value of cable line and carry out ac withstand voltage test to judge the insulation state of cable, but this method has obvious insulation defects, which cannot effectively detect slight insulation defects, so that timely maintenance cannot be carried out.

[0004] Therefore, the skilled person in the art provides a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal to solve the problems raised in the above background technology. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the shortcomings in the prior art, and provides a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal, when partial discharge occurs in cable, the device is set to ground loop sensor, which can cause charge movement, and the moving charge can generate pulse current in the peripheral measurement loop, and reach the ground through the grounding wire, the ground loop sensor can sense these small currents, so that partial discharge can be monitored, and the ground loop sensor adopts open type and directly passes through the grounding wire at both ends of cable, without electrical contact, easy to install, high reliability, and the partial discharge mutual inductor set can sense high-frequency pulse current, so that fault location can be carried out by judging the propagation time of fault traveling wave.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal, including three-core cable outer sheath, the both ends of the three-core cable outer sheath are provided with grounding pipe, the inside of the grounding pipe is provided with grounding wire, the outer wall of the grounding wire is sleeved with ground loop sensor, the side of the front end of the ground loop sensor is provided with cable partial discharge monitoring terminal, the lower end of the outer wall of the front end of the ground loop sensor is provided with connecting wire, the both sides of the outer wall of the three-core cable outer sheath are sleeved with partial discharge mutual inductor.

[0008] Through the technical scheme, the device can realize insulation monitoring and accurate fault point positioning of the multi-path mine power supply cable.

[0009] Further, one end of the connecting line away from the ground loop sensor is arranged at the input end of the cable partial discharge monitoring terminal.

[0010] Through the technical scheme, the signal can be transmitted to the cable partial discharge monitoring terminal through the connecting line.

[0011] Further, the outer wall of the two ends of the outer sheath of the three-core cable is fixedly connected with the cable line.

[0012] Through the technical scheme, the device can be better installed.

[0013] Further, the network port of the cable partial discharge monitoring terminal is provided with an optical fiber Ethernet.

[0014] Through the technical scheme, the signal can be transmitted through the optical fiber Ethernet, and the system can be conveniently monitored in real time.

[0015] Further, the inner wall of the outer sheath of the three-core cable is provided with a flat steel tape armor, the inner wall of the flat steel tape armor is provided with an inner sheath, and the inner part of the inner sheath is provided with a filler.

[0016] Through the technical scheme, the cable can be protected from mechanical damage and environmental factors, and the safe and stable operation of the cable can be ensured.

[0017] Further, the inner part of the filler is provided with a plurality of metal shielding layers, the inner wall of the metal shielding layer is provided with an outer semiconductor shielding layer, the inner wall of the outer semiconductor shielding layer is provided with an insulating layer, the inner wall of the insulating layer is provided with an inner semiconductor shielding layer, and the inner wall of the inner semiconductor shielding layer is provided with a wire.

[0018] Through the technical scheme, the outer semiconductor shielding layer is between the insulating layer and the metal shielding layer, and maintains good contact with the insulating layer, so that partial discharge can be prevented.

[0019] Further, a central filler is arranged at the center of the filler, and the metal shielding layer is connected with the ground wire.

[0020] Through the technical scheme, the cable has good flexibility and bending degree, and bending damage can be prevented.

[0021] The utility model has the following beneficial effects:

[0022] The utility model provides a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal, the device is passed through the grounding ring current sensor of being set, when cable occurs partial discharge, will cause charge movement, and this movement charge can produce impulse current in peripheral measurement loop, and reach ground by grounding wire, these tiny currents can be sensed by grounding ring current sensor, so that partial discharge can be monitored, and grounding ring current sensor adopts open type and directly passes through the grounding wire of cable two ends, without electrical contact, easy to install, high reliability, again by the setting of partial discharge mutual inductor can be inducted high-frequency impulse current, so that the propagation time of fault traveling wave can be judged to carry out fault location. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the axonometric drawing of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal;

[0024] Figure 2 It is the plan view of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal;

[0025] Figure 3 It is the structure schematic view of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal in grounding ring current sensor and the structure of other components;

[0026] Figure 4 It is the structure schematic view of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal in cable partial discharge monitoring terminal and the structure of other components;

[0027] Figure 5 It is the structure schematic view of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal in partial discharge mutual inductor and the structure of other components;

[0028] Figure 6 It is the structure schematic view of the utility model to propose a kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal in three-core cable outer sheath and the structure of other components.

[0029] LEGEND:

[0030] 1, three-core cable outer sheath;2, grounding pipe;3, grounding wire;4, grounding ring current sensor;5, cable partial discharge monitoring terminal;6, connecting wire;7, optical fiber Ethernet;8, partial discharge mutual inductor;9, cable line;10, wire;11, inner semiconductor shielding layer;12, insulation layer;13, outer semiconductor shielding layer;14, metal shielding layer;15, center filler;16, filler;17, inner sheath;18, flat steel belt armoring. DETAILED DESCRIPTION

[0031] 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 of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0032] With reference to Figures 1-6 An embodiment provided by the utility model:

[0033] A kind of multi-path mine cable insulation comprehensive monitoring and fault location terminal, including three-core cable outer sheath 1, the two ends of three-core cable outer sheath 1 are provided with grounding pipe 2, the inside of grounding pipe 2 is provided with ground wire 3, the outer wall of ground wire 3 is equipped with ground loop current sensor 4, the side of the front end of ground loop current sensor 4 is provided with cable partial discharge monitoring terminal 5, the lower end of the outer wall of the front end of ground loop current sensor 4 is provided with connecting wire 6, the both sides of the outer wall of three-core cable outer sheath 1 are equipped with partial discharge mutual inductor 8.

[0034] So the device can realize the insulation monitoring and fault point accurate positioning of multi-path mine power supply cable.

[0035] The end of connecting wire 6 away from ground loop current sensor 4 is arranged at the input end of cable partial discharge monitoring terminal 5, so that signals can be transmitted to cable partial discharge monitoring terminal 5 through connecting wire 6, the outer wall of the two ends of three-core cable outer sheath 1 is fixedly connected with cable line 9, so that the device can be better installed, the network port of cable partial discharge monitoring terminal 5 is provided with optical fiber Ethernet 7, so that signals can be transmitted through optical fiber Ethernet 7, and real-time monitoring of the system is facilitated, the inner wall of three-core cable outer sheath 1 is provided with flat steel belt armor 18, the inner wall of flat steel belt armor 18 is provided with inner sheath 17, the inside of inner sheath 17 is provided with filler 16, so that the cable can be protected from mechanical damage and environmental factors, and the safe and stable operation of the cable is ensured, the inside of filler 16 is provided with a plurality of metal shielding layers 14, the inner wall of metal shielding layer 14 is provided with outer semiconductor shielding layer 13, the inner wall of outer semiconductor shielding layer 13 is provided with insulation layer 12, the inner wall of insulation layer 12 is provided with inner semiconductor shielding layer 11, the inner wall of inner semiconductor shielding layer 11 is provided with wire 10, outer semiconductor shielding layer 13 is between insulation layer 12 and metal shielding layer 14, and good contact is maintained with insulation layer 12, so that partial discharge can be prevented, the center of the inside of filler 16 is provided with center filling core 15, and metal shielding layer 14 is connected with ground wire 3, so that the cable has good flexibility and bending degree, and bending damage is also prevented.

[0036] Working principle: when in use, the other end of the optical fiber Ethernet 7 is connected with the IEEE1588 switch and connected with the mine industrial Ethernet system, when the cable has partial discharge, the movement of the electric charge can produce pulse current in the peripheral measurement loop, the grounding wire 3 of the cable is led out from the linked metal shielding layer 14, so as to reach the ground through the grounding wire 3, and the ground loop current sensor 4 is used for measuring the ground loop current generated when the cable outer sheath insulation is damaged, and then the position of the cable outer sheath insulation fault point is determined according to the size of the ground current (or loop current) of the ground loop current sensor 4 at both ends of the cable, and the partial discharge mutual inductor 8 is used for measuring the partial discharge when the cable insulation is damaged, the discharge current enters the ground through the grounding wire 3, the partial discharge pulse current size and the partial discharge pulse current traveling wave transmission time of the grounding wire 3 are used to determine the position of the insulation fault point, and the multi-path means that the partial discharge intelligent monitoring terminal can monitor three or more cables at the same time.

[0037] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A multi-path mine cable insulation integrated monitoring and fault location terminal, comprising a three-core cable outer sheath (1), characterized in that: The three-core cable outer sheath (1) is provided with a grounding pipe (2) at both ends, the inside of the grounding pipe (2) is provided with a grounding wire (3), the outer wall of the grounding wire (3) is sleeved with a grounding circulating current sensor (4), one side of the front end of the grounding circulating current sensor (4) is provided with a cable partial discharge monitoring terminal (5), the lower end of the outer wall of the front end of the grounding circulating current sensor (4) is provided with a connecting line (6), and the outer wall of the three-core cable outer sheath (1) is sleeved with a partial discharge mutual inductor (8) on both sides.

2. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 1, characterized in that: The end of the connecting line (6) away from the grounding circulating current sensor (4) is arranged at the input end of the cable partial discharge monitoring terminal (5).

3. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 1, characterized in that: The outer wall of both ends of the three-core cable outer sheath (1) is fixedly connected with a cable line (9).

4. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 1, characterized in that: The network port of the cable partial discharge monitoring terminal (5) is provided with an optical fiber Ethernet (7).

5. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 1, characterized in that: The inner wall of the three-core cable outer sheath (1) is provided with a flat steel belt armor (18), the inner wall of the flat steel belt armor (18) is provided with an inner sheath (17), and the inside of the inner sheath (17) is provided with a filler (16).

6. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 5, characterized in that: The inside of the filler (16) is provided with a plurality of metal shielding layers (14), the inner wall of the metal shielding layer (14) is provided with an outer semiconductor shielding layer (13), the inner wall of the outer semiconductor shielding layer (13) is provided with an insulating layer (12), the inner wall of the insulating layer (12) is provided with an inner semiconductor shielding layer (11), and the inner wall of the inner semiconductor shielding layer (11) is provided with a wire (10).

7. The terminal for integrated monitoring and fault location of a multi-path mine cable insulation according to claim 6, characterized in that: The center of the inside of the filler (16) is provided with a center filling core (15), and the metal shielding layer (14) is connected with the grounding wire (3).

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