OPGW is mainly composed of optical units (optical fiber, protective tube) and ground wire units (aluminum-clad steel wire, aluminum alloy wire). Its three most important basic parameters are the diameter of the optical cable, rated tensile strength, and short-circuit current capacity.
The specific meanings of the OPGW parameters are as follows:
D–Diameter (mm), affects the horizontal load of the tower
S–Cross section (mm2), affects the strength and heat capacity of the optical cable
G–Unit weight (kg/km), depends on the material of the optical cable and the aluminum-steel ratio, affects the vertical load of the tower
RTS–Rated tensile strength (KN), affects the mechanical properties of the optical cable and the force of the tower
R–DC resistance (Ω/km, 20℃), depends on the material of the optical cable and the aluminum-steel ratio, affects the shunt performance
E–Elastic modulus (GPa), a basic parameter in mechanical calculation
α–Linear expansion coefficient (/℃), a basic parameter in mechanical calculation
I2t–Short-circuit current capacity (kA2.s), depends on the material and cross section of the optical cable
OPGW model specifications consist of four parts, each part is represented by a code or number (referenced to DL/T 832-2003)
As follows:
OPGW-24B1-80[100;32.8]
Parameter description:
24-Cable core,
B1-G652D single mode optical fiber
80-Total cable cross-section (mm2);
100-Rated tensile strength (kN);
32.8-Short-circuit current capacity (kA2.S);
Note:
In order to ensure the safe operation of OPGW, the design of OPGW also requires that the other ground wire has a strong shunting ability, which can effectively shun the current in the event of a single-phase ground short circuit and lightning strike in the power system. The current distribution between OPGW and the other ground wire can be approximately calculated according to the following formula:
IOPGW/ I Shunt Ground Wire =(Z Shunt Ground Wire-Z Mutual Resistance)/(ZOPGW-Z Mutual Resistance)
I OPGW-OPGW current, kA;
I Shunt Ground Wire-current in Shunt Ground Wire, kA;
Z OPGW-OPGW resistance, (Ω/km);
Z Shunt Ground Wire-resistance in Shunt Ground Wire, (Ω/km);
Z Mutual Resistance-mutual inductance impedance between two parallel ground wires (OPGW and another ground wire), (Ω/km).
OPGW Cable Detail reguirements need to be sent to us for cable desian and price calculation. Below requirements are a must.
A、Power transmission line voltage level
B、fiber count
C、Cable structure drawing & diameter
D、Tensile strength
E、Short circuit capacity
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