CN207704877U - A kind of compound Metro Cable of optical fiber - Google Patents

Abstract

The utility model is related to a kind of compound Metro Cables of optical fiber, including single-core cable, No.1 optical fiber, No. two optical fiber, photoelectric conversion devices, photoelectric conversion device to include：No.1 photoelectric converter, No. two photoelectric converters, alarms.Two optical fiber are respectively arranged in single-core cable sheath by the utility model, and wherein No.1 optical fiber is measured for cable temperature：No.1 photoelectric converter is set based on Raman scattering method, on the one hand electric signal flows into alarm and carries out temperature faults alarm, on the other hand flow into No. two photoelectric converters and provide temperature information for it；Wherein No. two optical fiber are measured for cable by external force：Set No. two photoelectric converters based on Brillouin Scattering, the electric signal of the electric signal of No.1 photoelectric converter and No. two photoelectric converters carry out difference handle obtain cable by outer force information.The utility model realizes the temperature measuring of Metro Cable each point and stress detects, and improves the uniformity coefficient and accuracy of measuring temperature and stress.Foundation is realized to offers such as Metro Cable fault detects.

Description

A kind of compound Metro Cable of optical fiber

Technical field

The utility model belongs to field of cables, is related to a kind of compound Metro Cable of optical fiber.

Background technology

At this stage, subway is because its reliability is high, carrying capacity is strong, it is all to transport a large amount of crowd etc. in the very short time More advantages just rapidly develop, and because subway operates in underground completely, how over the ground the illumination of train driving and platform is required for electricity consumption, Iron system is stable, reliably powers, and determines that abort situation overhaul at the first time when supply line breaks down and just show It obtains particularly important.During subway power supply, 35kV, 10kV ac cable are mainly applied.Above-mentioned cable is mainly placed in cable Ditch or using direct buried, the most immediate cause to break down in the process of running, which is insulation, to be reduced and breakdown, and is caused The factor of insulation breakdown mainly has：External force damage, running overload, ambient temperature effect and cogging problem, electricity from the point of view of summarizing The reason of cable breaks down mainly is influenced by external force and temperature,

At this stage, Cable fault examination is mainly temperature detection and burglar alarm.It is widely used in temperature detection Technology has thermocouple temperature measurement and optical fiber temperature-measurement.The principle of thermocouple temperature measurement be thermocouple resistance can with the variation of temperature and Variation, is converted to electric signal, and measure with this by the signal of temperature.Thermocouple temperature measurement is simple in structure, cheap, technology Maturation, but since thermocouple can only carry out point type thermometric, it can not be to whole cable run into the on-line monitoring of trip temperature, so tool There is certain limitation.Optical fiber have it is of low cost, not by electromagnetic interference, small in volume, high certainty of measurement, convenient for laying The advantages that, distributed optical fiber temperature measurement technology achieves that the circuit of logarithm kilometer carries out long term monitoring, existing rank using an optical fiber Section optical fiber temperature-measurement cable rests on laboratory stage more, and practical application is less.Existing optical fiber temperature-measurement cable is mainly to cable Joint is detected, and by fibre optic installations in Exterior cable.It is primarily present problems with：

（1）Metro Cable temperature increases main stand under load flow effect, and current-carrying capacity raising can cause cable many places temperature to increase, Only carrying out thermometric to cable connector part, there are security risks；

（2）Metro Cable lays environment complexity, and fibre optic installations easily damage optical fiber physical arrangement in Exterior cable；

（3）Metro Cable laying groove has a plurality of cable, fibre optic installations can be by other in Exterior cable measured temperature more Cable temperature, which rises, to be influenced；

（4）Metro Cable bends, then measurement accuracy can be caused to decline；

（5）Thermometric, anti-theft alarm function cannot be realized simultaneously.

Therefore, it is necessary to a kind of new technical solutions to solve the above problems.

Utility model content

In order to solve the above-mentioned technical problem, the utility model proposes a kind of compound Metro Cable of optical fiber, subway is realized Temperature measuring, the stress detection of cable each point, external interference is eliminated using built-in fiber, and optical fiber is installed on single-core cable shield In set, the uniformity coefficient and accuracy of measuring temperature and stress are improved.The service life of optical fiber is improved simultaneously.To electric power electricity It is provided in terms of cable fault detect and burglar alarm and realizes foundation.

Technical solution used by the utility model is：

A kind of compound Metro Cable of optical fiber, which is characterized in that including single-core cable, be arranged outside single-core cable epidermis No.1 optical fiber and No. two optical fiber and the photoelectric conversion device being connect simultaneously with No.1 optical fiber and No. two optical fiber.

At least two tubules are provided with outside a kind of above-mentioned compound Metro Cable of optical fiber, the single-core cable epidermis, With single-core cable center symmetric setting, No.1 optical fiber and No. two optical fiber are individually positioned in tubule, and tubule is installed on single-core cable Protective case in.

In a kind of above-mentioned compound Metro Cable of optical fiber, the photoelectric conversion device is installed on rising for the single-core cable Beginning section, including：No.1 photoelectric converter, No. two opto-electronic conversions and alarm, the No.1 photoelectric converter and described one The connection of number optical fiber, can emit optical signal and receive the scattered light signal of setting, described No. two photoelectric converters with it is described No. two optical fiber connections, can emit optical signal and receive the scattered light signal of setting.The No.1 photoelectric converter with it is described Alarm electrical connection, realize that cable temperature rises alarm by the way that electric signal is delivered to the alarm；The No.1 photoelectricity Converter is electrically connected with No. two photoelectric converters, and temperature information can be delivered to No. two photoelectric converters.Institute No. two photoelectric converters stated are electrically connected with the alarm, and cable is realized by the way that electric signal is delivered to the alarm Stress is alarmed.

In a kind of above-mentioned compound Metro Cable of optical fiber, the single-core cable takes triangle system of laying, wherein one At least two tubules are provided with outside a single-core cable epidermis, single-core cable includes：Core, internal shield, megohmite insulant, external screen Cover layer, protective case, corrosion-resistant coating.Core material is copper wire or aluminum steel.The megohmite insulant is surrounded on the core and institute Outside the internal shield stated.The internal shield is surrounded on the core surface, with the core equipotential, prevents the line Shelf depreciation occurs between core and the megohmite insulant.The external shielding layer is surrounded on megohmite insulant surface, prevents megohmite insulant Shelf depreciation is generated between protective case, the protective case is surrounded on external shielding layer surface.At least two tubules are installed on guarantor Inside sheath, the thickness of protective case is more than the diameter of tubule, and No.1 optical fiber, No. two optical fiber are respectively placed in inside two tubules.

Therefore the utility model has the following advantages that：Temperature measuring, the stress detection for realizing Metro Cable each point, use Built-in fiber eliminates external interference, and optical fiber is installed in single-core cable sheath, improves the uniform of measuring temperature and stress Degree and accuracy.The service life of optical fiber is improved simultaneously.It is provided in terms of to power cable fault detection and burglar alarm real Now depending on.

Description of the drawings

Fig. 1 is the external structure schematic diagram of the utility model.

Fig. 2 is the sectional view of the utility model.

Specific implementation mode

The utility model is understood and implemented for the ease of those of ordinary skill in the art, it is right with reference to the accompanying drawings and embodiments The utility model is described in further detail, it should be understood that implementation example described herein is only used for describing and explaining this Utility model is not used to limit the utility model.

Referring to Fig.1, the compound Metro Cable of a kind of optical fiber provided by the utility model, including single-core cable 1, No.1 optical fiber 2, No. two optical fiber 3, photoelectric conversion device 4.The photoelectric conversion device 4 is installed on the initial segment of the single-core cable 1, including： 5, No. two photoelectric converters 6 of No.1 photoelectric converter and alarm 7, the No.1 photoelectric converter 5 and the No.1 light Fibre 2 connects, and can emit optical signal and receive the scattered light signal of setting, described No. two photoelectric converters 6 and described two Number optical fiber 3 connects, and can emit optical signal and receive the scattered light signal of setting.The No.1 photoelectric converter 5 with it is described Alarm 7 be electrically connected, realize that cable temperature rises alarm by the way that electric signal is delivered to the alarm 7；The No.1 light Electric transducer 5 is electrically connected with No. two photoelectric converters 6, and temperature information can be delivered to No. two opto-electronic conversions Device.No. two photoelectric converters 6 are electrically connected with the alarm 7, by the way that electric signal to be delivered to the alarm 7 Realize the alarm of cable stress.

See Fig. 2, the single-core cable 1 includes using triangle system of laying, the single-core cable 1：Line Core 11, internal shield 12, megohmite insulant 13, external shielding layer 14, protective case 15, corrosion-resistant coating 16, tubule 8.The core 11 Material is copper wire or aluminum steel, and electric conductivity is good.13 material of megohmite insulant is crosslinked polyethylene, and insulation performance is good, It is surrounded on outside the core 11 and the internal shield 12.The internal shield 12 is made of semi-conducting material, ring It is around in 11 surface of the core, with 11 equipotential of the core, prevents from occurring between the core 11 and the megohmite insulant 13 Shelf depreciation.The external shielding layer 14 is made of semi-conducting material, is surrounded on 13 surface of the megohmite insulant, is prevented megohmite insulant Shelf depreciation is generated between 13 and protective case 15, the protective case 15 uses not halogen crosslinked polyethylene fire proofing.Institute The tubule 8 stated is installed on inside the protective case 15, and described 2, No. two optical fiber 3 of No.1 optical fiber are positioned over the tubule 8 It is internal.

When the present embodiment is in use, temperature measuring, the stress detection for realizing Metro Cable each point, are arranged using built-in fiber In addition to external interference, optical fiber is installed in single-core cable sheath, improve the uniformity coefficient of measuring temperature and stress with it is accurate Property.The service life of optical fiber is improved simultaneously.It is provided in terms of to power cable fault detection and burglar alarm and realizes foundation.

Although this specification more used single-core cable 1,2, No. two optical fiber 3 of No.1 optical fiber, photoelectric conversion device 4, The terms such as No.1 photoelectric converter 5, No. two photoelectric converters 6, alarms 7, but the possibility using other terms is not precluded. The use of these items is only for more easily describing the essence of the utility model, it is additional to be construed as any type Limitation is all contrary to the spirit of the present invention.

It should be understood that the part that this specification does not elaborate belongs to the prior art.It should be understood that above-mentioned Description for preferred embodiment is more detailed, therefore can not be considered the limit to the utility model patent protection domain System, those skilled in the art are protected under the enlightenment of the utility model not departing from the utility model claims Ambit under, replacement or deformation can also be made, each fallen within the scope of protection of the utility model, the utility model Range, which is claimed, to be determined by the appended claims.

Claims (3)

1. a kind of compound Metro Cable of optical fiber, which is characterized in that including single-core cable, be arranged outside single-core cable epidermis one Number optical fiber and No. two optical fiber and the photoelectric conversion device being connect simultaneously with No.1 optical fiber and No. two optical fiber；The single-core cable At least two tubules are provided with outside epidermis, with single-core cable center symmetric setting, No.1 optical fiber and No. two optical fiber are placed respectively In tubule, tubule is installed in the protective case of single-core cable.

2. the compound Metro Cable of a kind of optical fiber according to claim 1, it is characterised in that：The photoelectric conversion device peace The initial segment loaded on the single-core cable, including：No.1 photoelectric converter, No. two opto-electronic conversions and alarm, the No.1 Photoelectric converter is connect with the No.1 optical fiber, can be emitted optical signal and be received the scattered light signal of setting, and described two Number photoelectric converter is connect with No. two optical fiber, can be emitted optical signal and be received the scattered light signal of setting；Described No.1 photoelectric converter is electrically connected with the alarm, and cable Wen Sheng is realized by the way that electric signal is delivered to the alarm Alarm；The No.1 photoelectric converter is electrically connected with No. two photoelectric converters, can be delivered to temperature information described No. two photoelectric converters；No. two photoelectric converters are electrically connected with the alarm, by the way that electric signal to be delivered to The alarm realizes the alarm of cable stress.

3. the compound Metro Cable of a kind of optical fiber according to claim 1, which is characterized in that the single-core cable takes three Angular system of laying is provided at least two tubules outside one of single-core cable epidermis, and single-core cable includes：It is core, interior Shielded layer, megohmite insulant, external shielding layer, protective case, corrosion-resistant coating；Core material is copper wire or aluminum steel；The megohmite insulant It is surrounded on outside the core and the internal shield；The internal shield is surrounded on the core surface, and described Core equipotential prevents that shelf depreciation occurs between the core and the megohmite insulant；The external shielding layer is surrounded on insulation Material surface prevents from generating shelf depreciation between megohmite insulant and protective case, and the protective case is surrounded on external shielding layer surface； At least two tubules are installed on inside protective case, and the thickness of protective case is more than the diameter of tubule, No.1 optical fiber, No. two optical fiber difference It is positioned over inside two tubules.