CN107037310A - The cable and its detecting system and detection method of breaking point detection can be carried out - Google Patents
The cable and its detecting system and detection method of breaking point detection can be carried out Download PDFInfo
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- CN107037310A CN107037310A CN201710391786.8A CN201710391786A CN107037310A CN 107037310 A CN107037310 A CN 107037310A CN 201710391786 A CN201710391786 A CN 201710391786A CN 107037310 A CN107037310 A CN 107037310A
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- layer
- thin wire
- cable
- voltmeter
- detection
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
Abstract
A kind of cable for carrying out breaking point detection, includes conductor, internal layer, inner metal shield layer and outer layer successively from inside to outside, and the inner metal shield layer is around with thin wire, and the gap between the inner metal shield layer and the outer layer is filled by glass fiber；The thin wire includes core and thin wire insulating barrier.Its detecting system and detection method are also endured simultaneously, when occurring short trouble, high current heats up inner metal shield layer, and high temperature causes thin wire insulating barrier to be melted, conductor is realized with inner metal shield layer contact and connected, and realizes the quick measurement to trouble point.
Description
Technical field
The present invention relates to breakpoint of cable detection field, and in particular to a kind of cable for carrying out breaking point detection and its detection system
System and detection method.
Background technology
Cable be short-circuited blow when, it is impossible to the problem of short time is clear from breakpoint, work about electric power personnel exclude
During failure, the prolonged power failure of this region large area；
Detection to the break-make of cable is easily realized, but the breaking point detection of cable can not be realized；
Prior art only has to be detected to the breakpoint of the communications cable, and is by launching high-frequency signal, then according to high frequency
The feedback of signal is judged, still the breakpoint of cable can not be detected.
The breaking point detection method for comparing traditional feasible cable is to be realized by the measurement of electric capacity and breakpoint location is judged,
Disadvantage is that after failure occurs, staff just takes corresponding judgement operation, then repairs, not all work
Personnel can accurately be measured, it is desirable to have special messenger measures, it is impossible to cable is burnt into horse in short-term because of short circuit in circuit
On judge result, and point out.
The content of the invention
The present invention in view of the shortcomings of the prior art, proposes that one kind can be examined to breakpoint caused by cable short circuit in time
The cable surveyed and pointed out, while there is provided its detecting system and detection method, realizing the quick judgement to breaking point detection, being not required to
Special messenger's actively measurement is wanted, the function of automatic detection is realized, concrete technical scheme is as follows：
A kind of cable for carrying out breaking point detection, includes conductor, internal layer, inner metal shield layer and outer successively from inside to outside
Layer, the inner metal shield layer is around with thin wire, and the gap between the inner metal shield layer and the outer layer passes through glass
Silk fiber is filled；
The thin wire includes core and thin wire insulating barrier.
When occurring short trouble, high current heats up inner metal shield layer, and high temperature causes thin wire insulating barrier to be melted,
Conductor is realized with inner metal shield layer contact and connected.
A kind of restriction of scheme, the conductor, the internal layer and the inner metal shield layer formed inside conductor, it is described in lead
Line has three, and three inside conductors are twisted together, and outer metal is provided between the inner metal shield layer and the thin wire
Screen layer, the outer metal screen layer wraps up three inside conductors together, and the thin wire is wound on the outer metallic shield
On layer, the glass fiber is filled between the outer metal screen layer and the outer layer.
Inner metal shield layer and external shielding layer are partly led for the medium-low voltage power cable without protective metal shell except being provided with
Outside shield layer, also to increase metal screen layer.Metal screen layer is generally formed by copper strips or copper wire are wrapped, primarily serves shielding
The effect of electric field, inner metal shield layer and external shielding layer herein also act as the effect that measure loop is formed with thin wire simultaneously.
A kind of restriction of scheme, the internal layer includes internal shield, insulating layer of conductor and external shielding layer successively from inside to outside,
The internal shield and the external shielding layer are made by semiconductive shieldin material.
Semi-conductive screen semiconductive shielding layer is generally arranged at the outer surface of electric conductor and the outer surface of insulating layer of conductor,
It is referred to as inner semiconductor layer and out semiconductor layer.Semiconductive shielding layer is by resistivity is very low and thinner thickness
Semiconductive material is constituted.Inner semiconductor layer is for uniform conductor outer surface electric field, it is to avoid because conductive surface it is rough with
And conductor strand produce air gap and cause conductor and insulation occur shelf depreciation.Outside out semiconductor layer and insulating layer of conductor
Surface contact is fine, and with protective metal shell equipotential, it is to avoid occur because of defects such as cable insulation face cracks with protective metal shell
Shelf depreciation.
A kind of restriction of scheme, the outer layer includes fireprotection layer and external sheath layer successively from inside to outside, and the fireprotection layer is
The overcoat that mica tape is made.
Mica tape：
Normal temperature performance：Synthetic mica tape is best, muscovite band takes second place, gold mica tape is poor.
Insulating properties under high temperature：Synthetic mica tape is best, gold mica tape takes second place, muscovite band is poor.
Resistance to elevated temperatures：Synthetic mica tape fluorophlogopite belt, without the crystallization water, 1375 DEG C of fusing point, margin of safety is big, resistance to height
Warm nature can preferably, and phlogopite discharges the crystallization water more than 800 DEG C, and resistance to elevated temperatures is taken second place, 600 DEG C of muscovite disengages crystallization
Water, its performance of the poor of resistance to elevated temperatures is also rooted in the Compound Degree of mica tape machine.
Fire safety cable is a kind of high performance mica insulation product with mica tape, with excellent resistance to elevated temperatures and
Flame resistance energy.With good flexibility during mica paper tape normality, it is adaptable to main refractory insulating layer in various fire-resisting cables.
The volatilization of harmful vapors is substantially not present when meeting naked light burning, so the product is not only effective and very safe for cable.
A kind of restriction of scheme, more than one of the thin wire, the interval of the thin wire circumferentially is equal.
When can avoid metal screen layer and a certain thin wire from not forming loop, other thin wires can be connected still,
It ensure that the validity of detection and monitoring.
A kind of breakpoint detection system, including detection power supply, cable, voltmeter and controller, the detection power supply connect institute
Inner metal shield layer or the outer metal screen layer are stated, each described thin wire collects rear communication with detection power supply, the voltmeter
With the detection power sources in parallel.
Realize the real-time monitoring and processing in real time to breakpoint.
A kind of restriction of scheme, in addition to reminding module, the voltmeter are the voltmeter with data-transformation facility, described
Controller and voltmeter connection, the reminding module and controller connection.
The effective ear of testing result can be shown and be prompted to staff.
A kind of detection method, comprises the following steps：
The first step, prepares cable, detection power supply, voltmeter, controller and reminding module, the metal screen layer of the cable
Outer setting thin wire, the thin wire is externally provided with thin wire insulating barrier, the voltmeter band data-transformation facility；
Second step, sets up and installs cable；
3rd step, the metal screen layer is connected with the detection power supply, by the thin wire and the detection power supply
Connection, the metal screen layer, detection power supply and thin wire are sequentially connected in series, the voltmeter and the detection power sources in parallel, institute
Voltmeter and controller connection are stated, the reminding module is connected with the controller.
It is low with cost, it is easy for installation, it is not necessary to which that professional survey crew can monitor in real time, it is that rapid-maintenance improves base
This condition, it is to avoid prolonged power failure.
A kind of restriction of scheme, the electric current of the detection power supply is I, and the radical of the thin wire is n, the metallic shield
The resistivity of layer is ρ1, the cross-sectional area of the metal screen layer is S1, the resistivity of the thin wire is ρ2, the thin wire
Cross-sectional area be S2, the length of the cable is L, and the magnitude of voltage of the voltmeter is U, and the voltmeter transmits U values to institute
State controller,
The processing method of the controller is as follows：
L=U/ { I (ρ1*S1)+I(ρ2*S2)/n}；
S1Much larger than S2, ignore the resistance sizes of the thin wire, draw：
L=U/ { I (ρ1*S1)+0}；
L=U/ { I (ρ1*S1)}。
A kind of restriction of scheme, the controller receives and stores the U Value Datas of the voltmeter.
Cross-sectional area due to thin wire with compare too small, therefore ignore the Resistance Influence of thin wire, only consider metallic shield
The influence of layer, after measure loop connection, voltmeter gathered data, and it is transferred to controller, controller data storage, because
Cable is when generation short trouble blows cable, and metal screen layer is not necessarily what is connected in real time with thin wire, even if occurring
Instantaneous connection can also realize the measurement of distance, failure judgement point.
Beneficial effects of the present invention are：Thin wire is set by the metal screen layer in cable, with by voltage measurement, so
Controller stores data and calculates the distance of trouble point afterwards, can be monitored in real time, even the instantaneous connection of measure loop
The detection of trouble point can also be realized.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Fig. 2 is circuit and flow chart of the invention.
Cross-sectional structure schematic diagram when Fig. 3 is an inside conductor 7.
Cross-sectional structure schematic diagram when Fig. 4 is three inside conductors 7.
Fig. 5 is the structural representation of the cross section of thin wire 5.
Symbol description：Thin wire resistance R1, metal screen layer resistance R2。
Embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.
A kind of cable for carrying out breaking point detection, includes conductor 1, internal layer 2,3 and of inner metal shield layer successively from inside to outside
Outer layer 4, the inner metal shield layer 3 is around with thin wire 5, and the gap between the inner metal shield layer 3 and the outer layer 4 leads to
Glass fiber 6 is crossed to fill；
The thickness of internal layer 2 is 3.5mm；
The thin wire 5 includes core 51 and thin wire insulating barrier 52.The material of thin wire insulating barrier 52 is the poly- second of crosslinking
Alkene material, the cross-sectional area of thin wire 5 is 0.5mm2。
When occurring short trouble, high current heats up inner metal shield layer 3, and high temperature causes thin wire insulating barrier 52 to be melt
Change, conductor 1 is realized with the contact of inner metal shield layer 3 and connected.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, the conductor 1, the internal layer 2 and inner metal shield layer 3 are formed
Inside conductor 7, the inside conductor 7 has three, and three inside conductors 7 are twisted together, and the gap between three inside conductors 7 passes through
Mica tape is filled.Outer metal screen layer 8, the outer metallic shield are provided between the inner metal shield layer 3 and the thin wire 5
Layer 8 wraps up three inside conductors 7 together, and the thin wire 5 is wound on the outer metal screen layer 8, and the glass fiber is fine
Dimension 6 is filled between the outer metal screen layer 8 and the outer layer 4.
Inner metal shield layer 3 and external shielding layer 23 are for the medium-low voltage power cable without protective metal shell, except being provided with
Outside semiconductive shielding layer, also to increase metal screen layer.Metal screen layer is generally formed by copper strips or copper wire are wrapped, is primarily served
The effect of electric field is shielded, inner metal shield layer 3 and external shielding layer 23 herein are also acted as and the formation measure loop of thin wire 5 simultaneously
Effect.
As shown in Figure 3, Figure 4, the internal layer 2 includes internal shield 21, insulating layer of conductor 22 and external screen successively from inside to outside
Layer 23 is covered, the internal shield 21 and the external shielding layer 23 are made by semiconductive shieldin material.Insulating layer of conductor 22 is crosslinking
Polythene material is made.
Semi-conductive screen semiconductive shielding layer is generally arranged at the outer surface of electric conductor 1 and the appearance of the insulating barrier of conductor 1
Face, is referred to as inner semiconductor layer and out semiconductor layer.Semiconductive shielding layer be by resistivity is very low and thickness compared with
Thin semiconductive material is constituted.Inner semiconductor layer is for the outer surface electric field of uniform conductor 1, it is to avoid because of the surface of conductor 1 not
Smooth and the stranded generation of conductor 1 air gap and cause conductor 1 and insulation occur shelf depreciation.Out semiconductor layer and conductor
The contact of 1 insulating barrier outer surface is fine, and with protective metal shell equipotential, it is to avoid because of defects such as cable insulation face cracks and metal
Shelf depreciation occurs for sheath.
As shown in Figure 3, Figure 4, the outer layer 4 includes fireprotection layer 41 and external sheath layer 42, the fire prevention successively from inside to outside
Layer 41 is the overcoat 41 that mica tape is made.Also winding glass fibre successively outside overcoat 41 has glass fibre 6, then exists again
Outer layer extrusion molding restrictive coating 42.
Mica tape：
Normal temperature performance：Synthetic mica tape is best, muscovite band takes second place, gold mica tape is poor.
Insulating properties under high temperature：Synthetic mica tape is best, gold mica tape takes second place, muscovite band is poor.
Resistance to elevated temperatures：Synthetic mica tape fluorophlogopite belt, without the crystallization water, 1375 DEG C of fusing point, margin of safety is big, resistance to height
Warm nature can preferably, and phlogopite discharges the crystallization water more than 800 DEG C, and resistance to elevated temperatures is taken second place, 600 DEG C of muscovite disengages crystallization
Water, its performance of the poor of resistance to elevated temperatures is also rooted in the Compound Degree of mica tape machine.
Fire safety cable is a kind of high performance mica insulation product with mica tape, with excellent resistance to elevated temperatures and
Flame resistance energy.With good flexibility during mica paper tape normality, it is adaptable to main refractory insulating layer in various fire-resisting cables.
The volatilization of harmful vapors is substantially not present when meeting naked light burning, so the product is not only effective and very safe for cable.
As shown in figure 4, the thin wire 5 have between three, the thin wire 5 on circumference at intervals of 120 degree.
When can avoid metal screen layer and a certain thin wire 5 from not forming loop, other thin wires 5 can still connect
It is logical, it is ensured that the validity of detection and monitoring.
As shown in Fig. 2 including detection power supply 10, cable, voltmeter 11 and controller 12, the detection power supply 10 connection institute
Inner metal shield 3 or described outer metal screen layer 8 of layer are stated, each described thin wire 5 collects rear communication with detection power supply 10, the electricity
Press table 11 and the detection power supply 10 in parallel.
Realize the real-time monitoring and processing in real time to breakpoint.
As shown in Fig. 2 also including reminding module 13, the voltmeter 11 is the voltmeter 11 with data-transformation facility, institute
State controller 12 and the voltmeter 11 is connected, the reminding module 13 and the controller 12 are connected.
The effective ear of testing result can be shown and be prompted to staff.
As shown in Figure 1 and Figure 2, a kind of detection method, comprises the following steps：
The first step, prepares cable, detection power supply 10, voltmeter 11, controller 12 and reminding module 13, the gold of the cable
Belong to and thin wire 5 is set outside screen layer, the thin wire 5 is externally provided with thin wire insulating barrier 52, and the voltmeter 11 is with data transfer
Function；
Second step, sets up and installs cable；
3rd step, the metal screen layer is connected with the detection power supply 10, by the thin wire 5 and the detection electricity
Source 10 is connected, and the metal screen layer, detection power supply 10 and thin wire 5 are sequentially connected in series, the voltmeter 11 and the detection electricity
Source 10 is in parallel, and the voltmeter 11 and the controller 12 are connected, and the reminding module 13 is connected with the controller 12.
It is low with cost, it is easy for installation, it is not necessary to which that professional survey crew can monitor in real time, it is that rapid-maintenance improves base
This condition, it is to avoid prolonged power failure.
The electric current of the detection power supply 10 is I, and the radical of the thin wire 5 is n, and the resistivity of the metal screen layer is
ρ1, the cross-sectional area of the metal screen layer is S1, the resistivity of the thin wire 5 is ρ2, the cross-sectional area of the thin wire 5
For S2, the length of the cable is L, and the magnitude of voltage of the voltmeter 11 is U, and the voltmeter 11 transmits U values to the control
Device 12,
The processing method of the controller 12 is as follows：
L=U/ { I ρ1*S1)+I(ρ2*S2)/n}；
S1Much larger than S2, ignore the resistance sizes of the thin wire 5, draw：
L=U/ { I (ρ1*S1)+0}；
L=U/ { I (ρ1*S1)}。
As shown in Fig. 2 the controller 12 receives and stores the U Value Datas of the voltmeter 11.
Cross-sectional area due to thin wire 5 with compare too small, therefore ignore the Resistance Influence of thin wire 5, only consider metal screen
The influence of layer is covered, after measure loop connection, the gathered data of voltmeter 11, and controller 12 is transferred to, controller 12 is stored
Data, because cable is when generation short trouble blows cable, metal screen layer is not necessarily real-time connect with thin wire 5
, it can also realize the measurement of distance, failure judgement point even if the connection for occurring instantaneous.
Claims (10)
1. a kind of cable for carrying out breaking point detection, it is characterised in that：Include conductor (1) successively from inside to outside, it is internal layer (2), interior
Metal screen layer (3) and outer layer (4), the inner metal shield layer (3) are around with thin wire (5), the inner metal shield layer (3)
Filled by glass fiber (6) in gap between the outer layer (4)；
The thin wire (5) includes core (51) and thin wire insulating barrier (52).
2. a kind of cable for carrying out breaking point detection according to claim 1, it is characterised in that：It is the conductor (1), described
Internal layer (2) and inner metal shield layer (3) form inside conductor (7), and the inside conductor (7) has three, three inside conductors
(7) twist together, outer metal screen layer (8) is provided between the inner metal shield layer (3) and the thin wire (5), it is described
Outer metal screen layer (8) wraps up three inside conductors (7) together, and the thin wire (5) is wound on the outer metal screen layer
(8) on, the glass fiber (6) is filled between the outer metal screen layer (8) and the outer layer (4).
3. a kind of cable for carrying out breaking point detection according to claim 1, it is characterised in that：The internal layer (2) is by interior
To including internal shield (21), insulating layer of conductor (22) and external shielding layer (23), the internal shield (21) and described successively outside
External shielding layer (23) is made by semiconductive shieldin material.
4. a kind of cable for carrying out breaking point detection according to claim 1, it is characterised in that：The outer layer (4) is by interior
To fireprotection layer (41) and external sheath layer (42) is included successively outside, the fireprotection layer (41) is the overcoat (41) that mica tape is made.
5. according to a kind of any described cables for carrying out breaking point detection of claim 1-4, it is characterised in that：The thin wire
(5) more than one, the interval of the thin wire (5) circumferentially is equal.
6. a kind of breakpoint detection system, it is characterised in that：Including detection power supply (10), cable, voltmeter (11) and controller
(12), the detection power supply (10) connects the inner metal shield layer (3) or the outer metal screen layer (8), and each is described thin
Wire (5) collects rear communication with detection power supply (10), and the voltmeter (11) and the detection power supply (10) are in parallel.
7. a kind of breakpoint detection system according to claim 6, it is characterised in that：Also include reminding module (13), it is described
Voltmeter (11) is the voltmeter (11) with data-transformation facility, the controller (12) and the voltmeter (11) connection, institute
State reminding module (13) and the controller (12) connection.
8. a kind of detection method, it is characterised in that：Comprise the following steps：
The first step, prepares cable, detection power supply (10), voltmeter (11), controller (12) and reminding module (13), the cable
Metal screen layer outside thin wire (5) is set, the thin wire (5) is externally provided with thin wire insulating barrier (52), the voltmeter
(11) band data-transformation facility；
Second step, sets up and installs cable；
3rd step, the metal screen layer is connected with the detection power supply (10), by the thin wire (5) and the detection electricity
Source (10) is connected, and the metal screen layer, detection power supply (10) and thin wire (5) are sequentially connected in series, the voltmeter (11) and institute
State detection power supply (10) in parallel, the voltmeter (11) and the controller (12) are connected, the reminding module (13) and described
Controller (12) is connected.
9. a kind of detection method according to claim 8, it is characterised in that：The electric current of the detection power supply (10) is I, institute
The radical for stating thin wire (5) is n, and the resistivity of the metal screen layer is ρ1, the cross-sectional area of the metal screen layer is S1,
The resistivity of the thin wire (5) is ρ2, the cross-sectional area of the thin wire (5) is S2, the length of the cable is L, the electricity
The magnitude of voltage for pressing table (11) is U, and voltmeter (11) the transmission U values give the controller (12),
The processing method of the controller (12) is as follows：
L=U/ { I (ρ1*S1)+I(ρ2*S2)/n}；
S1Much larger than S2, ignore the resistance sizes of the thin wire (5), draw：
L=U/ { I (ρ1*S1)+0}；
L=U/ { I (ρ1*S1)}。
10. a kind of detection method according to claim 9, it is characterised in that：The controller (12) receives and stores institute
State the U Value Datas of voltmeter (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710391786.8A CN107037310A (en) | 2017-05-27 | 2017-05-27 | The cable and its detecting system and detection method of breaking point detection can be carried out |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710391786.8A CN107037310A (en) | 2017-05-27 | 2017-05-27 | The cable and its detecting system and detection method of breaking point detection can be carried out |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490710A (en) * | 2018-11-23 | 2019-03-19 | 中国二十二冶集团有限公司 | The method for searching aluminium cable breakpoint |
| CN110554273A (en) * | 2019-09-02 | 2019-12-10 | 昆山纬亚智能科技有限公司 | Detection method of PCBA short circuit point |
| CN111766193A (en) * | 2020-07-08 | 2020-10-13 | 广东电网有限责任公司 | Power cable metal shielding layer corrosion defect detection device and method thereof |
| CN112542263A (en) * | 2020-10-31 | 2021-03-23 | 无锡卡尔曼导航技术有限公司 | Agricultural machinery cable and automatic testing arrangement thereof |
| CN113035436A (en) * | 2021-02-19 | 2021-06-25 | 安徽铁信光电科技有限公司 | Fireproof cable |
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| CN110554273A (en) * | 2019-09-02 | 2019-12-10 | 昆山纬亚智能科技有限公司 | Detection method of PCBA short circuit point |
| CN111766193A (en) * | 2020-07-08 | 2020-10-13 | 广东电网有限责任公司 | Power cable metal shielding layer corrosion defect detection device and method thereof |
| CN111766193B (en) * | 2020-07-08 | 2022-06-14 | 广东电网有限责任公司 | Power cable metal shielding layer corrosion defect detection device and method thereof |
| CN112542263A (en) * | 2020-10-31 | 2021-03-23 | 无锡卡尔曼导航技术有限公司 | Agricultural machinery cable and automatic testing arrangement thereof |
| CN113035436A (en) * | 2021-02-19 | 2021-06-25 | 安徽铁信光电科技有限公司 | Fireproof cable |
| CN113035436B (en) * | 2021-02-19 | 2023-02-17 | 安徽铁信光电科技有限公司 | Fireproof cable |
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