What are the power performance of OPGW cable

1. DC resistance

The calculated value of parallel DC resistance of all conductive elements in OPGW shall be as close as possible to the opposite grounding wire.

2. short circuit current

When the system is short circuited (usually single-phase grounding short circuit), the maximum current that OPGW can withstand within a certain short-circuit time. In the calculation, the values of short-circuit current time and start stop temperature will affect the calculation results, which should be close to the actual working conditions as much as possible. The maximum operating temperature of OPGW is a controversial issue. The test results show that the instantaneous high temperature of 300 ℃ (or slightly higher) will not pose a serious threat to the buffer and protection of optical fiber. However, if the structure contains aluminum, the aluminum is at 200 & deg; Above C, irreversible plastic deformation will first occur. When the structure is damaged, the sag of OPGW may collide with the steel wire. If all steel structures can be in 300 DEG in a short time; C。

3. short circuit current capacity

It is the square of the short-circuit current times the square of time.

4. lightning resistance

OPGW cable is actually a lightning conductor. There is usually no specific lightning resistance index in the technical parameters of OPGW, and it is not specified in ieeie138, but it is specified in relevant IEC standards. OPGW shall pass corresponding lightning protection test.