3优Tunnel Cable
Tunnel Cables, Cable tunnels are corridors or tunnel-like structures used to accommodate large numbers of cables laid on cable supports. In addition to allowing tunnels to better protect cables, cable tunnels can also make it easy to inspect and repair cables.
With the development of society, the use of electricity is essential to our lives, and cable tunnels are inextricably linked to electricity. A cable tunnel is a tunnel used for laying cables.
There are many advantages of cable tunnels, the most obvious of which is that it is a one-time investment in the construction of the tunnel and there are a lot of cable supports, after the tunnel is completed, only need to check on time, without having to propose new plans to the relevant departments i
In order to ensure the absolute safety of the tunnels, the tunnels also do a lot of details of the requirements. Cable tunnel inside the design of lighting facilities, when the lighting voltage exceeds 36 volts, it will have an impact on the safety of the tunnel, thus affecting the safety of the cable, so the "Electrical Design Code for Civil Buildings," there are express provisions, lighting facilities in the cable tunnel voltage can not exceed 36 volts, if more than that, it is necessary to take certain safety measures In addition to the lighting requirements, the drainage system in the tunnel there are also certain Requirements. For example, the longitudinal drainage slope of the cable tunnel can not be less than 0.5%, as well as the bottom of the tunnel should be designed to drain, as well as in the tunnel when necessary, mechanical drainage, etc., in the tunnel safety protection, the tunnel to set up a safety hole is very necessary.
NO.1, Jiangnan Cable has advanced production technology and equipment. From the manufacturing of conductors to the processing of insulation, shielding and sheathing, every step is precise and strict to ensure the high quality of medium voltage cables.
NO.2, the quality control is extremely strict. The company has established a perfect quality inspection system, from the selection of raw materials to the finished products leaving the factory, checking at every level. Each medium-voltage cable has to go through a number of strict tests to ensure that the products meet or even exceed the national standards.
NO.3, Jiangnan Cable has invested heavily in research and development. According to the market demand and customers' special requirements, we can develop medium voltage cables with different characteristics, such as better environmental resistance and better current carrying capacity. Moreover, the rich product line can meet the different needs of various complex projects and provide customers with one-stop cable solutions.
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what we finished
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| Conductor Cross Section | Number of cores | Material Type | Insulation Thickness | Shielding type | Number of Shielding Layers | Material Selection | Color Identification | Armor type | Armor Layers | Fire resistance | Waterproof performance | Flame retardant performance | Cold resistance | Sample customization request meters | |
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Cable tunnels in a variety of forms and categories, different forms of tunnels with different operating characteristics, the importance of different.
Classification according to use
1. special tunnels: tunnels dedicated to the laying of power cables.
2. common ditch: also known as integrated pipe ditch, is a comprehensive corridor of underground urban pipelines, it is set up exclusively for a variety of public utilities to place a variety of pipeline tunnels under the ground
3.shared tunnels: refers to power cables and roads, railways and other municipal transport facilities used in common tunnels.
Classified by voltage level
1.high-voltage tunnels: refers to cable tunnels in the cable voltage level are 110 kV and above.
2.low-voltage tunnels: cable tunnel cable voltage level are below 110 kV.
3.high and low voltage mixed tunnel: refers to cable tunnels within the cable voltage level is not strictly regulated.
Classification by access method
The access mode of cable tunnel refers to the form of power line access on both sides of the tunnel. Mainly includes three forms:
1. Both ends are substations.
2.one end of the substation, the other end of the overhead line access.
3. Both ends of the overhead line access.
Due to the special use function, cable tunnels are generally long and narrow, with few entrances and exits, and the tunnels are fire blocked and have many obstacles.
1. Narrow space, few entrances and exits. Cable tunnels are a kind of closed and narrow structures, generally made of brick, stone and other non-combustible materials masonry, long and narrow space, usually about 1.8 m high, about 1.5 m wide, and some cable replacement of fewer places, there are also less than 1 m wide and high cable tunnels. In order to construction, maintenance, inspection of the convenience of the tunnel is generally left with a pedestrian access road, every few dozen metres to set up a maintenance entrance and ground connected.
2. Along the course of blocking, obstacles. There are several layers of cable supports on both sides of the tunnel, placing more cables. In the laying of cables, the tunnel is also set up inside the fire-resistant partition used to fire separation between the cable layers and blocking cable holes, to prevent the flame from penetrating and spreading of fire netting, firewalls set up in the relevant parts of the important circuit and fire-resistant compartments set up in the shaft and other fire separators, but these fire separators in the event of a fire, it will varying degrees of impediments to fire-fighting operations.
There are no other combustible materials in cable tunnels, and fires are generally caused by cables catching fire and burning. The insulating layers of cables are all combustible materials, and improper use and maintenance may cause fire.
Third, the characteristics of fire-fighting facilities
Cable tunnels are generally set up with mobile fire extinguishers and fixed fire extinguishing systems.
1. cable tunnels are configured according to the medium fire hazard level with a certain number of fire extinguishers, mainly ABC dry powder fire extinguishers.
2.cable tunnels set up a fixed fire extinguishing system usually carbon dioxide gas fire extinguishing system, gas fusion (smoke) fire extinguishing system and water spray fire extinguishing system.
3.Some larger cable tunnels are equipped with anti-smoke facilities.
Acceptance content
(1) lighting. Cable tunnels should be introduced from both ends of the low-voltage lighting power supply, and interval arrangement of lamps and lanterns, a two-way control switch. Lamps should be moisture-proof, explosion-proof type.
(2) Ventilation. Tunnel ventilation has natural ventilation and forced exhaust two ways. Urban roads on the cable tunnel, can be in the conditions of the green zone construction of inlet and outlet shaft, the use of inlet and outlet shaft height difference in the formation of air pressure, so that the natural circulation of air. Forced exhaust air needs to be installed fan, according to the tunnel volume and ventilation requirements for ventilation calculations, in order to determine the power of the fan and automatic on and off time.
(3) Drainage. The whole tunnel should have drainage channels, and there must be automatic drainage devices. If there is any infiltration water in the tunnel, it will be concentrated in the water collection pits at both ends, and when it reaches a certain water level, the automatic drainage device will be activated, and the water will be discharged to the city sewer by drainage pumps.
(4) Fire-fighting measures. In order to ensure the safety of cables, there must be reliable fire-fighting measures in the cable tunnel. Tunnel shall not be used with fibre-wrapped outer layer of the cable, should be used with fire-retardant properties, not externally combustible outer sheath of the cable, in the not positively combustible cable outer protective layer, should be coated with fire-resistant paint or wrapped around the fireproof wrapping tape. High-voltage cables should be covered with fireproof groove box made of durable fireproof material for the whole line. Such as single-core cables, can be zigzag arrangement, three-phase cover in a group of fire tank, fire tank ends with fire-resistant material plugging. Fire alarms and automatic fire extinguishing devices should also be installed in tunnels.
