CN201828671U

CN201828671U - Cable identifying probe

Info

Publication number: CN201828671U
Application number: CN2010201251894U
Authority: CN
Inventors: 胡晓剑
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-08
Filing date: 2010-03-08
Publication date: 2011-05-11
Anticipated expiration: 2020-03-08

Abstract

The utility model discloses a cable identifying probe, which relates to a measuring device for knowing the diameter of cables by aiming at accurate positioning and identifying detection on target cables under complicated severe environment such as underwater environment and the like and belongs to the field of electric power measuring equipment. The cable identifying probe comprises a probe rod and a probe, wherein the probe rod is a hollow metal corrugated pipe (4) capable of being flexibly bended to deform without rebounding, one end of the metal corrugated pipe (4) is connected with the probe, the other end of the corrugated pipe (4) is provided with a handle (3), a signal wire, a grounding wire and a power supply wire of the probe are placed in the corrugated pipe (4), and the probe is an anti-interference probe provided with a shielding mechanism. The cable identifying probe collects magnetic field strength signals generated by signal current on the ground, the current value of detecting signals is obtained through calculation, and the problems of cable detection and identification under complicated conditions such as underwater conditions, narrow spaces, partial burying and the like are solved.

Description

The cable identification probe

Technical field

The utility model relates to a kind of measurement mechanism of in many cables a root object cable wherein accurately being located and discerning, and belongs to the power measurement apparatus field.

Background technology

Advantages such as China's more and more power cables that adopt in urban construction replace ground pole line power supply at present, and this mode exists area occupied little, is not subjected to ectocine, and is safe, and operation maintenance is simple can at utmost guarantee the safety of powering.But, because cable laying underground more hidden, is difficult to quick failure judgement point when breaking down; And in the power grid construction of China, owing to reasons such as of the remote past, personnel amendment, urban construction, the inconsistent situation of the data information of underground cable and actual condition is more and more, make in real work, usually to run into the parallel situation of the identical cable of track, under the situation that sign disappearance, track are failed to understand, will realize accurately distinguishing quite difficulty.Therefore, need the complete quick detection cable of a cover and the equipment of test cable trouble spot, at present, utilize dynamic cable detection technology can design such equipment.

As shown in Figure 1, dynamically the cable detection technology be section start in target cable utilize clamp coil 11 by coupling scheme to the specific detectable signal of cable input, this detectable signal is produced by special sender unit 9, detectable signal by the armature of cable crust along cable transmission, detect detectable signal with signal receiving device 10 in the place that cable may occur, if can detect detectable signal, and carry out wireless remote checking, just can determine target cable by communication antenna 13.A key link of this detection mode is that the general at present clamp-type that adopts of cancellation is (with clamp coil 11 same structures, but parameter is distinguished to some extent) signal acquisition method, but utilize the electric current I that detects detectable signals as the sniffer 12 of a signal receiving device part ₁, and adopt certain shielding construction to avoid electric current I near its cable ₂, I ₃To its interference.Originally the sniffer 12 of non-contact type current measurement adopts the closed path split-core type meter that goes in ring, it is a kind of current transformer in essence, make the magnetic core set of two semi-circular with magnetic conductive material, on chip, coil, in order to the marking current (by signal mutual inductance pincers signal is injected cable under test exactly as sender unit among Fig. 1, the present signal that uses detects technology and also adopts same signal mutual inductance pincers to carry out input) of gathering target cable.When adopting the electric current split-core type meter to measure electric current, split-core type meter must wholely entangle cable and magnetic core set is in the closure state that head and the tail connect, the pacing of going forward side by side is detected in the magnetic field of cable periphery calculate its source electric current, this method is more accurate, but be subjected to a lot of restrictions in actual use, must expose such as cable, must have enough operating spaces to open and close around the cable to realize the electric current split-core type meter, or the like.In real work, the ungratified situation of condition of work appears in regular meeting, in the long-term process of construction of China's electrical network, the codes and standards disunity, the system of laying of cable is very many, and is very chaotic, such as big raceway groove is arranged, small channel, direct burial, calandria, even have the different electric pressures situation of ditch altogether in a lot of places, also exist cable to be submerged in the water, partly to bury or all to be buried in situation in the soil layer in a large number, field condition is very complicated; In view of above situation, in the detection of reality to target cable, not only echo signal is subjected to other signal serious interference, and the actual condition of a lot of cables can't detect by the closed path split-core type meter that goes in ring, this just makes traditional detection means be subjected to very big restriction, presses for a kind of novel checkout equipment of design.

Summary of the invention

The purpose of this utility model is: a kind of detection probe with function of shielding that has flexible handle is provided, and the magnetic field intensity by detection streamer surface certain any calculates corresponding current value, thereby detects target cable.

The utility model proposes a kind of anti-tampering probe of meter, and adopts the distortion of non-closed coupling signal acquiring mode, flexible bending and do not have the bar linkage structure and the waterproofing protection of resilience, is used under water, the detection and Identification of narrow space, part buried cable.

To achieve these goals, taked following technical scheme: design a kind of cable identification probe, comprise feeler lever and probe, but described feeler lever is a metallic bellows that connects the hollow flexible bending distortion of probe and do not have resilience, the other end of corrugated tube is provided with handle, places signal wire, ground wire and the power lead of probe in the corrugated tube.

Probe in this programme is made of inductive coil or Hall element, shielding body, elementary amplifying circuit, plastic casing; Wherein, described inductive coil is that helical is tubular; Described shielding body is closed pipe or the square tube that magnetic conductive material is made, and establishes opening in the shielded-plate tube both ends of the surface, and side is parallel with axis direction establishes an elongated gap to tube wall near measuring along tubing, and shielding body carries out ground connection by ground wire; Inductive coil or Hall element place in the shielding body, and the central axis of inductive coil or Hall element and the central axes of shielding body or parallel, its signal pass feeler lever by signal wire and insert signal receiving device after elementary amplifying circuit amplifies.Wherein, described elongated gap width minimum is not less than 1.5 millimeters, and maximum is no more than the bottom length of side of square tube or 1/3 girth of pipe

Can measure cable under the wet environment in order to make this device; reach the outside surface that respectively connects the position at probe, feeler lever and all spray non-magnetic colloidality material with water barrier performance; perhaps the probe and feeler lever be encapsulated in the seal rubber sleeve of service part with shape in, protect.

Good effect of the present utility model: underwater survey, the narrow space that adopts such scheme to solve cable current measured, part is buried difficult problems such as measurement.As long as the diameter of known target cable just can carry out cable current and measure simple, convenient and rapidly.Owing to adopt magnetic field intensity probe with shielding properties, both can solve the magnetic saturation problem of closed magnetic core coil when signals collecting, also can realize having guaranteed the accuracy of cable detection identification to effective shielding of undesired signal and to the accurate collection of echo signal.

Description of drawings

The existing cable identification of Fig. 1 fundamental diagram;

The structural representation of one preferred embodiment of Fig. 2 cable identification probe of the present utility model;

The elementary amplifying circuit schematic diagram of popping one's head among Fig. 3 Fig. 2.

Among the figure: 1, communication antenna, 2, signal receiving device, 3, handle, 4, corrugated tube, 5, inductive coil (Hall element), 6, elementary amplifying circuit, 7, elongated gap (under gap was positioned at during actual fabrication, promptly parts were pressed close to cable side), 8, the end face opening, 9, shielding body, 10, the feeler lever web member.

Embodiment

Below in conjunction with accompanying drawing the preferred implementation in the utility model is elaborated:

Feeler lever in the present embodiment is at one end installed insulated handle 3 by corrugated stainless steel tubing 4 and is constituted.Corrugated tube 4 other ends are connected with probe by feeler lever web member 10, and the power lead of probe and signal wire are received signal receiving device 2 by corrugated tube 4.

Probe constitutes (as shown in Figure 3) for anti-tampering Shielding Design by inductive coil 5 and shielding body 9.Inductive coil 5 wherein is that helical is tubular, and is connected with elementary amplifying circuit 6 inputs; Shielding body 9 wherein is that magnetic conductive material is (as siliconized plate, permalloy) pipe of making, establish an elongated gap 7 at tube wall along axis direction, inductive coil 5 is placed in the shielding pipe, such design can realize that probe has the magnetic screening action of selectivity direction, when probe is pressed close to detection streamer with the perpendicular operating angle of elongated gap 7 and cable axis, only allow the magnetic lines of force to penetrate to the end face opening 8 that leaves the elongated gap parallel 7 and allow the magnetic line of force to pass in and out, and other undesired signals are played certain shielding action with the magnetic line of force in detected echo signal source side.According to experiment effect, elongated gap 7 width minimums are not less than 1.5 millimeters, and maximum is no more than the bottom length of side of square tube or 1/3 girth of pipe; Gap is more little, and antijamming capability is strong more, but the detection sensitivity reduction, gap is big more, and antijamming capability reduces, but detection sensitivity strengthens.Shielding body 9 is to be close to cable under test perpendicular to the cable axis direction when detecting, elongated gap 7 is towards cable under test, the magnetic line of force that marking current produces penetrates anti-tampering shielding body 9 by end face opening 8 and elongated gap 7 and acts on inductive coil 5 and produce the detection electric current, the magnetic line of force that the cable under test body produces allows to pass through detection probe, the then most of conductively-closed of other undesired signal, magnetic saturation problem when this structure both can solve signals collecting, also can realize to effective shielding of undesired signal and to the accurate collection of echo signal, the accuracy when having guaranteed cable detection identification.

Probe and the connected mode of elementary amplifying circuit 6 as shown in Figure 3, telefault 5 is in parallel with first resistance R 1, their an end ground connection, the gate pole of another termination N raceway groove JFET (technotron); The source electrode of JFET links to each other the other end ground connection of this parallel network with an end of the parallel network that is made of second resistance R 2 and first capacitor C 1.The drain electrode of JFET links to each other with the base stage of NPN type triode; The 3rd resistance R 3 is connected across between the collector and base stage of NPN; The collector of NPN links to each other with VCC, and its source electrode is through the 4th resistance R 4 ground connection, the signal after source electrode amplifies by 2 outputs of second capacitor C simultaneously.Telefault 5 samplings obtain characterizing the voltage/current signals of cable surrounding magnetic field Strength Changes amount, these signal relative signal receiving trap 2 treatable signal levels are very faint, so, at first carry out the processing and amplifying of the first order through the JFET of a N raceway groove, and then amplify by partial transistor amplifier circuit, obtain the suitable level signal that can be handled by signal receiving device 2.

Realizing operability and antijamming capability simultaneously, present embodiment is also considered the waterproof problem in the practical application, all sprays the non-magnetic colloidality material with water resistance at probe, feeler lever and feeler lever web member.As natural rubber or EP rubbers heating and melting is liquid back spraying detection probe, feeler lever and probe connecting portion, realizes the water-tight purpose under the prerequisite that does not influence the probe measuring ability.The utility model can adapt to underwater cable detection problem like this.

When testing, the signal that probe records is handled through signal receiving device 2, through communication antenna 1 and original signal checking, determines target cable again.Because corrugated stainless steel tubing has the characteristic of crooked no resilience arbitrarily; can be according to field condition as required with any crooked feeler lever of manual type with avoiding obstacles; with probe with the angle that is parallel to the cable plumb cut to by partial occlusion; the cable of small space is surveyed; and corrugated stainless steel tubing has the protection to lead; the anti-tampering effect of shielding protection is played in the sensed current signal transmission that probe is captured trace; have various complex working condition (small spaces; part exposes; the cable close quarters) adaptability is guaranteed the accurate collection to the target cable source signal.

Claims

1. cable identification probe, comprise feeler lever and probe, it is characterized in that: but described feeler lever is a metallic bellows (4) that connects the hollow flexible bending distortion of probe and do not have resilience, the other end of corrugated tube (4) is provided with handle (3), places signal wire, ground wire and the power lead of probe in the corrugated tube (4).

2. cable identification probe as claimed in claim 1 is characterized in that: described probe is made of inductive coil or Hall element (5), shielding body (9), elementary amplifying circuit (6), plastic casing; Wherein, described inductive coil (5) is that helical is tubular; Closed pipe or square tube that described shielding body (9) is made for magnetic conductive material, and establish opening (8) in the shielded-plate tube both ends of the surface, side is parallel with axis direction establishes an elongated gap (7) to tube wall near measuring along tubing, and shielding body (9) carries out ground connection by ground wire; Inductive coil or Hall element (5) place in the shielding body (9), the central axis of inductive coil or Hall element and the central axes of shielding body or parallel, its signal passes feeler lever by signal wire and inserts signal receiving device (2) after elementary amplifying circuit (6) amplifies.

3. cable identification probe as claimed in claim 2 is characterized in that: described elongated gap (7) width minimum is not less than 1.5 millimeters, and maximum is no more than the bottom length of side of square tube or 1/3 girth of pipe.

4. as claim 1 or 2 or 3 described cable identification probes, it is characterized in that: described feeler lever and probe outside surface, point of attachment all spray the non-magnetic colloidality material with water resistance.

5. as claim 1 or 2 or 3 described cable identification probes, it is characterized in that: described feeler lever and the probe be encapsulated in the seal rubber sleeve of service part with shape in.