Aluminum Tube Power System OPGW/OPPC/OPLC 96core Hybrid Fiber Optic
Cable Customize Constructure
Power System OPGW/OPPC/OPLC 96Core Hybrid Fiber Optic Cable
Description:
OPGW-Optical Fiber Composite Overhead Ground Wire. The optical
fiber is placed in the ground wire of the overhead high-voltage
transmission line to form an optical fiber communication network on
the transmission line. This structural form has the dual functions
of ground wire and communication, and is generally called OPGW
optical cable.
Structure:
Common OPGW structure
There are three main categories:
- aluminum tube type,
- aluminum frame type,
- (stainless) steel tube type.
Introduction:
Optical fiber utilizes the difference in refractive index between
the core and cladding materials to enable light to be transmitted
in the optical fiber, which has become a major revolution in the
history of communications. The optical fiber cable is light in
weight and small in size, and has been adopted by the power system
to transmit information such as dispatch telephones, telecontrol
signals, relay protection, and television images between the
substation and the central dispatch station. In order to improve
the stability and reliability of fiber optic cables, foreign
countries have developed a composite structure in which the phase
conductors of the optical cable and the transmission line, the
overhead ground wire, and the power cable are integrated. The OPGW
optical cable is more reliable, stable and firm due to the metal
wire wrapping. Because the overhead ground wire and the optical
cable are integrated, compared with other optical cables, the
construction period is shortened and the construction cost is
saved. In addition, if the OPGW twisted by aluminum clad steel wire
or aluminum alloy wire is used, it is equivalent to setting up a
good conductor overhead ground wire, which can receive the
reduction of the potential supply current of the transmission line,
the reduction of the power frequency overvoltage, and the
improvement of the power line to the communication line.
Interference and dangerous effects, etc. Due to its
anti-electromagnetic interference, light weight and other
characteristics, the optical fiber can be installed on the top of
the transmission line tower without having to consider the optimal
mounting position and electromagnetic corrosion. Therefore, OPGW
has remarkable features such as higher reliability, superior
mechanical performance, and lower cost. This technique is
particularly suitable and economical when laying or replacing
existing ground wires.
Application:
OPGW optical cable is mainly used on 500KV, 220KV and 110KV voltage
level lines. It is mostly used on new lines due to the influence of
line power outage and safety.
The applicable characteristics of OPGW are:
(1) The line with high voltage exceeding 110kv has a large gear
distance (generally above 250M);
(2) Easy to maintain, easy to solve the problem of line crossing,
its mechanical characteristics can meet the large line crossing;
(3) The outer layer of OPGW is metal armor, which has no effect on
high voltage electrical corrosion and degradation;
(4) OPGW must be powered off during construction, and the power
loss is large, so OPGW should be used in new high-voltage lines
above 110kv;
(5) In the performance index of OPGW, the greater the short-circuit
current, the more need to use a good conductor as armor, the
tensile strength will be reduced accordingly, and in the case of a
certain tensile strength, to increase the short-circuit current
capacity, only increase The metal cross-sectional area leads to an
increase in cable diameter and cable weight, which poses a safety
issue for the strength of the line tower.
Specification:
| Total number of fiber cores | 2-48 |
| Outer diameter (mm) | 7.8mm~8.5mm |
| Cable Max unit weight (kg/km) | 65+ |
| Allowable pull force (N) | long-term | 600 |
| short-term | 1500 |
| Allowable crush strength (N/100mm) | long-term | 300 |
| short-term | 1000 |
| Min bending radius (mm) | static | 25 times of cable external diameter |
| dynamic | 20 times of cable external diameter |
| Application of temperature | -40°C-70°C |
