CN214374990U - Electrified cable identification instrument - Google Patents

Abstract

The utility model discloses a live cable identification instrument, which belongs to a live cable detection device, and comprises a transmitter and a receiver, wherein the transmitter comprises a handle body, the front end of the handle body is provided with a current clamp, the current clamp comprises a left clamp and a right clamp, the tail end of the right clamp is provided with a trigger, the left clamp and the right clamp are movably arranged at the front end of the handle body, and the left clamp and the right clamp form a rectangle together; the inside of the handle body is also provided with a main control circuit board, a transmitting circuit is integrated on the main control circuit board, and the transmitting circuit is connected with the current clamp; the transmitting circuit is provided with a grounding end and at least three transmitting terminals, and the transmitting terminals are used for respectively transmitting direct current pulse signals with different frequencies to core wires of the cable to be detected. Through the shape of designing left pincers and right pincers for the rectangle for the straight flange of left pincers can conveniently be embedded into and lean on the wall cable, tests in order to adapt to more cable erection environment.

Description

Electrified cable identification instrument

Technical Field

The utility model relates to a live cable detection device, more specifically the utility model discloses mainly relate to a live cable discernment appearance.

Background

At present, electrified cable identification instruments on the market are various in types, and generally have no problem in the conventional cable identification in normal operation, but because the cables in a cable trench are complicated and complicated, some cables are maintained, replaced and moved for many times, a plurality of construction units are constructed, and corresponding marks are not made; in other cases, power cables are damaged carelessly during other municipal construction, so that the power cables are short-circuited and broken, and the like. The existing instrument is troublesome in identification operation, low in working efficiency, high in manpower and material resource consumption and even inaccurate in identification. The electrified cable identification appearance on the current market all comprises 4 main parts of independent emission host computer, emission current pincers, receiving host computer, receiving current pincers, and the emission pincers is separated with the transmitter, and the receiving pincers also is separated with the receiver, and the field usage will carry 4 sets, carries the operation all very inconvenient. The three-core cable is required to be provided with a cable sleeve for electrified identification, the armor grounding is good, the resistance value of a generally formed grounding loop cannot exceed 200 ohms, the grounding loop cannot be correctly identified if the resistance value of the grounding loop is too large, the open circuit of an armor grounding wire cannot be identified, and the three-core cable cannot be identified if a copper braid has a break point in the middle of the cable; and the three-phase unbalanced current or the induced current of the three-core cable cannot be too large, the interference current instrument cannot identify the three-phase unbalanced current or the induced current by operating the 2A current, and the interference current is considered to be too large when the three-phase unbalanced current or the induced current is too large, so that the instrument cannot normally identify the three-phase unbalanced current or the induced current.

The traditional cable identification instrument cannot identify a single-core electrified cable, particularly a single-core electrified cable of 110KV and above, or a 220V single-core wire, or a single-core communication wire, and the traditional cable identification instrument cannot identify the single-core electrified cable. In addition, the transmitting pliers and the receiving pliers of the traditional product are common current pliers, no shielding layer structure is provided, the anti-interference performance of field test is poor, the distance between two pliers is kept to be at least more than 2 meters during test, the two pliers are not interfered with each other, and the operation cannot be carried out in some cable wells. And traditional transmission pincers and receiving pincers all adopt circular binding clip, inconvenient pincers of going into when the cable is vertical to lean on the wall and the clearance with the wall is less. In the identification of the power failure cable, the current power failure identification instrument loads signals to 1 core wire of a target cable at the near end by a direct connection method, 3 core wires of the target cable need to be independently grounded at the far end, and then a receiver and a receiving clamp are used for far-end identification. In some cases, only 1 core wire is loaded with a signal, and the core wire has a break point in the middle, so that the signal cannot be transmitted and cannot be identified. Regardless of live cable identification or power failure cable identification, the existing identification instrument can only identify one cable at a time, after one cable is identified, a far-end engineer runs back to a near end to calibrate and sample the cable needing to be identified additionally, then the far end identifies a second cable, the engineer operating on site often runs back and forth at two ends of the cable, the cable to be reexamined can not be identified once or twice, and a large amount of manpower and material resources are consumed. Therefore, the development of a multifunctional full-intelligent cable identification instrument is very necessary.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the one of the aforesaid is not enough, provides a live cable discernment appearance to it is complicated to expect to solve the discernment appearance structure of the same kind among the prior art, carries inconveniently, and electrified discernment interval is narrow, appears the unable discernment of breakpoint easily, marks technical problem such as sampling operation trouble.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a live cable identification instrument, the identification instrument include transmitter and receiver, the transmitter includes the handle body, the front end of handle body is equipped with the current clamp, the current clamp includes left pincers and right pincers, the end of right pincers is equipped with the trigger, and left pincers and right pincers movable mounting are at the front end of handle body, left pincers and right pincers form the rectangle jointly; a main control circuit board is further mounted inside the handle body, a transmitting circuit is integrated on the main control circuit board, and the transmitting circuit is connected to the current clamp; the transmitting circuit is provided with a grounding end and at least three transmitting terminals, and the transmitting terminals are used for respectively transmitting direct current pulse signals with different frequencies to core wires of the cable to be detected.

Preferably, the further technical scheme is as follows: iron core components are arranged in the left clamp and the right clamp of the current clamp respectively, a coil is wound on the iron core components, and the coil is connected to a transmitting circuit on the main control circuit board; the inner side, the outer side, the upper part and the lower part of the left clamp and the right clamp are provided with shielding sheets.

The further technical scheme is as follows: the upper part of the right clamp is also provided with an infrared temperature measuring probe and an LED lamp group, and the infrared temperature measuring probe and the LED lamp group are also connected to the main control circuit board.

The further technical scheme is as follows: the tail end of the handle body is also provided with a control keyboard and a display screen, and the control keyboard and the display screen are also connected to the main control circuit board.

The further technical scheme is as follows: the handle body is characterized in that a connection interface of a grounding end and three transmitting terminals is arranged at the tail end of the handle body, a storage battery is further installed inside the handle body, the main control circuit board is connected into the storage battery, the storage battery is further connected into a USB charging interface, and the USB charging interface is installed at the tail end of the handle body.

The further technical scheme is as follows: the structure of the receiver is the same as that of the transmitter, a receiving circuit is mounted on a main control circuit board of the receiver, and the receiving circuit is used for receiving the direct current pulse signals output by the transmitting circuit.

The further technical scheme is as follows: the direct current pulse signals at least comprise seven direct current pulse signals with the frequencies of 22 Hz, 625Hz, 1562Hz, 2500Hz, 10kHz, 80.1kHz and 300 kHz.

Compared with the prior art, the beneficial effects of the utility model are one of following at least:

the left clamp and the right clamp are designed into rectangular shapes, so that the straight edge of the left clamp can be conveniently embedded into a cable close to a wall, and the cable clamp is suitable for more cable installation environments to test;

different pulse signals are loaded to the three-wire cable through the three transmitting terminals respectively, so that even if a breakpoint exists in the middle of one or two core wires, the three-wire cable can be normally identified, and the three-wire cable testing device is suitable for cable testing under more conditions;

the current value, the current variation trend and the current phase relation of the cable at a certain moment at two ends of the cable can be accurately tested through satellite time service, so that the single-core electrified cable can be identified.

Meanwhile, the live cable identification instrument provided by the invention is simple in structure, suitable for industrial production and easy to popularize.

Drawings

Fig. 1 is a schematic structural diagram for explaining an embodiment of the present invention;

FIG. 2 is a schematic view of the backside structure of FIG. 1;

FIG. 3 is a schematic diagram of the disassembled structure of FIG. 1;

fig. 4 is a schematic diagram for explaining a split structure of the current clamp according to an embodiment of the present invention;

in the figure, 1 is a handle body, 2 is a current clamp, 21 is a left clamp, 22 is a right clamp, 3 is a trigger, 4 is a main control circuit board, 5 is an iron core assembly, 6 is a coil, 7 is an infrared temperature measuring probe, 8 is an LED lamp group, 9 is an operation keyboard, 10 is a display screen, 11 is a connecting interface, 12 is a storage battery, 13 is a battery compartment cover, and 14 is a torsion spring.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1 and 2, an embodiment of the present invention is a live cable identification device, which includes a transmitter and a receiver, and the transmitter and the receiver have substantially the same structure in terms of their structural designs, and are similar to two clamp-on ammeters; specifically, the transmitter includes a handle body 1, the handle body 1 has an outer shell as shown in fig. 1, a current clamp 2 is designed at the front end of the handle body 1, the current clamp 2 includes a left clamp 21 and a right clamp 22, and a trigger 3 is arranged at the end of the right clamp 22, the left clamp 21 and the right clamp 22 are movably mounted at the front end of the handle body 1, the right clamp 22 and the left clamp 21 can be opened and closed by the trigger 3, as shown in fig. 3, the trigger can be reset by a torsion spring 14, and importantly, in order to facilitate embedding of some cables against the wall, the left clamp 21 and the right clamp 22 are designed to be shaped so as to form a rectangle, specifically, as shown in fig. 1 and fig. 2; on the basis, the clamp heads 68mmx88mm, 88mmx128mm and 128mmx150mm with three specifications of calibers can be designed according to the thickness of the cable so as to improve the practicability.

Moreover, a main control circuit board 4 is required to be installed inside the handle body 1, the main control circuit board 4 can be a PCB board so as to integrate the required circuits, the core circuit is a transmitting circuit integrated on the main control circuit board 4, and the transmitting circuit is required to be connected to the current clamp 2; the transmitting circuit is also provided with a grounding terminal and at least three transmitting terminals, so that the transmitting terminals can respectively send direct current pulse signals with different frequencies to the core wires of the tested cable; further, the direct current pulse signals at least comprise seven direct current pulse signals with the frequencies of 22 Hz, 625Hz, 1562Hz, 2500Hz, 10kHz, 80.1kHz and 300kHz, in practical use, the seven direct current pulse signals are automatically sent circularly, a transmitting clamp is coupled to a target cable, a receiver receives and identifies corresponding frequency signals, and multiple frequencies are adopted so as to stagger same-frequency interference signals. The low-frequency transmission distance is long, and the anti-interference performance is poor; the high-frequency transmission distance is short, and the anti-interference performance is strong. The automatic cycle sending and receiving signal also reduces the complexity of operation and improves the efficiency.

Preferably, for the convenience of matching use, the structure of the receiver is the same as that of the transmitter, and a receiving circuit for receiving the direct current pulse signal output by the transmitting circuit is mounted on the main control circuit board 4 of the receiver. Similarly, the dc pulse signals include at least seven dc pulse signals having frequencies of 22 Hz, 625Hz, 1562Hz, 2500Hz, 10kHz, 80.1kHz, and 300 kHz.

In this embodiment, it is preferable that the structure of the current clamp is a shielding structure to ensure shielding performance of the current clamp and avoid interference from external signals. Accordingly, the structure of the current clamp is redesigned, specifically referring to fig. 4, the iron core assembly 5 is integrated inside the left clamp 21 and the right clamp 22 of the current clamp 2, then the coil 6 is wound around the iron core assembly 5, and the coil 6 is connected to the transmitting circuit on the main control circuit board 4, that is, the transmitting circuit transmits the dc pulse signal through the coil 6; meanwhile, correspondingly, the shielding sheets are arranged on the inner side, the outer side, the upper part and the lower part of the left clamp 21 and the right clamp 22, namely the shielding sheets are arranged on the periphery of the coil 6, so that the interference in use can be avoided.

According to another embodiment of the present invention, in order to facilitate the temperature measurement and the use of the identifier when the light is dark, an infrared temperature measurement probe 7 and an LED lamp set 8 can be added on the upper portion of the right clamp 22 of the current clamp 2, and the infrared temperature measurement probe 7 and the LED lamp set 8 are also connected to the main control circuit board 4; through the infrared temperature measuring probe 7, non-contact infrared temperature measurement inspection can be performed on transformer substations, transformer inlet and outlet cables, cable joints, target cables needing to be identified and the like. Therefore, whether the cable and the electric equipment have fault hidden danger or not is detected. The LED lamp bank 8 can adopt a high-brightness LED, and can be used as a flashlight in a cable trench and a cable well in a place with insufficient light, so that the operation safety is improved. In this embodiment, for convenience of observation and operation, a control keyboard 9 and a display screen 10 may be designed at the end of the housing of the handle body 1, and the control keyboard 9 and the display screen 10 are also connected to the main control circuit board 4; and the tail end of the handle body 1 is provided with a connecting interface 11 of a grounding end and three transmitting terminals, meanwhile, a storage battery 12 is also installed inside the handle body 1, the main control circuit board 4 is connected into the storage battery 12, meanwhile, the storage battery 12 is also connected into a USB charging interface, and the USB charging interface is installed on the tail end of the handle body 1. The battery 12 is mounted in a battery compartment on the handle body 1, and a battery compartment cover 13 is also mounted on the battery compartment.

Based on the above embodiment, the utility model provides an electrified cable identification appearance still has following characteristics:

1. for convenience of carrying and operation, the transmitter and the receiver are designed into a clamp meter appearance mode.

2. In order to facilitate the pliers to measure the cable which is close to the wall and has a narrow gap with the wall, the cable is designed into a rectangular opening shape, and the straight edge of the left pliers is convenient to be inserted.

3. In order to improve the wide frequency characteristic and reduce magnetic leakage, the iron core is punched into sheets by nickel alloy with the thickness of 0.5mm, and then is cross-meshed and riveted, and the resolution capability of the micro current is improved.

4. Three kinds of jaw size designs satisfy the cable test needs of different thickness, improve the suitability.

5. The front ends of the transmitter and the receiver clamp heads are provided with infrared temperature measuring sensors, and non-contact infrared temperature measurement inspection can be carried out on transformer substations, transformer in-out cables, cable connectors, target cables needing to be identified and the like. Whether the cable and the electric equipment have fault hidden danger or not is detected.

6. The front ends of the transmitter and the receiver clamp heads are provided with the high-brightness LED lamp group, so that the flashlight can be used as a flashlight in a cable trench and a cable well in a place with insufficient light, and the operation safety is improved.

7. 7 kinds of frequency are launched, the same frequency signal interference is avoided, and the accuracy of cable identification is improved.

8. The transmitter and the receiver are both internally provided with GPS and GSM modules, and can position the head end and the tail end of the identified cable.

9. The transmitter and the receiver can test current, the current range can be 0.01mA-2000A, and the current clamp meter can be used as a high-precision clamp leakage current clamp meter and can also replace a common current clamp meter. Through a GPS module arranged in the instrument, satellite time service is carried out, and the relation among the phase, the current value and the current change trend of the cable at a certain moment at two ends of the cable is accurately tested, so that the identification of the single-core electrified cable is realized. The method comprises the steps that a transmitter and a receiver simultaneously test the current size, the current change trend and the phase of a single-core electrified cable at a certain time point, judge whether the single-core electrified cable is the same cable, send signals detected at two ends through a built-in GSM module, and then the receiver gives an identification result.

10. The instrument has multiple functions, and can test unbalanced current and leakage current of the cable besides live cable identification and power failure cable identification; testing voltage, phase, infrared temperature measurement, GPS positioning, flashlight function and the like.

11. The utility model discloses can mark 35 cables, discern many cables and need not run back and forth often, to different cables, transmitter and receiver are first near-end, the transmitter sends different frequency signal, the signal of different gain intensity to every cable; the receiver stores and calibrates the signals of each cable at the near end and then identifies the signals at the far end. And the engineering personnel do not need to run back and forth, so that the efficiency of cable identification is improved. For the same cable, different frequencies and different gains can be combined for parameter calibration, and for the same cable, 35 combination parameters can be calibrated. For example, in Table 1, the L1 numbers are calibrated to have a frequency of 80.1kHz and a gain of 10 dB; the L2 number is calibrated to have the frequency of 2500Hz, the gain of 20dB, the L3 number is calibrated to have the frequency of 625Hz, the gain of 1dB, and the L1, the L2 and the L3 at this time refer to the same cable. The method can identify the same cable through various combination parameters, and improves the identification accuracy.

Table 1: frequency gain signal combination calibration meter

Frequency of

1dB

20dB

40dB

60dB

80dB

22 Hz

L1

L8

L15

L22

L29

625Hz

L2

L9

L16

L23

L30

1562Hz

L3

L10

L17

L24

L31

2500Hz

L4

L11

L18

L25

L32

10kHz

L5

L12

L19

L26

L33

80.1kHz

L6

L13

L20

L27

L34

300kHz

L7

L14

L21

L28

L35

12. When power failure identification is carried out, signals are loaded on 3 core wires at the same time, and the condition that 1 or 2 core wires are broken can be avoided, and identification of the cable can also be completed by passing 3 core wires.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (7)

1. The utility model provides a live cable discernment appearance which characterized in that: the recognizer comprises a transmitter and a receiver, the transmitter comprises a handle body (1), a current clamp (2) is arranged at the front end of the handle body (1), the current clamp (2) comprises a left clamp (21) and a right clamp (22), a trigger (3) is arranged at the tail end of the right clamp (22), and the left clamp (21) and the right clamp (22) are movably arranged at the front end of the handle body (1); the left clamp (21) and the right clamp (22) form a rectangle together;

a main control circuit board (4) is further mounted inside the handle body (1), a transmitting circuit is integrated on the main control circuit board (4), and the transmitting circuit is connected to the current clamp (2);

the transmitting circuit is provided with a grounding end and at least three transmitting terminals, and the transmitting terminals are used for respectively transmitting direct current pulse signals with different frequencies to core wires of the cable to be detected.

2. The live cable identification instrument of claim 1, wherein: iron core components (5) are arranged inside the left clamp (21) and the right clamp (22) of the current clamp (2), a coil (6) is wound on the iron core components (5), and the coil (6) is connected to a transmitting circuit on the main control circuit board (4); the inner side, the outer side, the upper part and the lower part of the left clamp (21) and the right clamp (22) are provided with shielding sheets.

3. The live cable identification instrument of claim 1, wherein: the upper part of the right clamp (22) is also provided with an infrared temperature measuring probe (7) and an LED lamp bank (8), and the infrared temperature measuring probe (7) and the LED lamp bank (8) are also connected to the main control circuit board (4).

4. The live cable identification instrument of claim 1, wherein: the handle is characterized in that the tail end of the handle body (1) is also provided with a control keyboard (9) and a display screen (10), and the control keyboard (9) and the display screen (10) are also connected into the main control circuit board (4).

5. The live cable identification instrument of claim 4, wherein: the handle is characterized in that a connection interface (11) of a grounding end and three transmitting terminals is arranged at the tail end of the handle body (1), a storage battery (12) is further installed inside the handle body (1), the main control circuit board (4) is connected into the storage battery (12), the storage battery (12) is further connected into a USB charging interface, and the USB charging interface is installed at the tail end of the handle body (1).

6. The live cable identification instrument according to any one of claims 1 to 5, wherein: the structure of the receiver is the same as that of the transmitter, a receiving circuit is mounted on a main control circuit board (4) of the receiver, and the receiving circuit is used for receiving the direct current pulse signals output by the transmitting circuit.

7. The live cable identification instrument of claim 6, wherein: the direct current pulse signals at least comprise seven direct current pulse signals with the frequencies of 22 Hz, 625Hz, 1562Hz, 2500Hz, 10kHz, 80.1kHz and 300 kHz.

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