GROZA
GROZA software has been designed to calculate annual lightning resulted outages of 6-115 kV overhead power lines with possible implementation of Line Lightning Protection Devices (LLPDs) with different options of installation on poles as well as identification of reasonable LLPDs installation options in accordance with maximal allowed amount of lightning resulted trips or number LLPDs on hand.
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Description of calculations
GROZA software allows to create lines and substations design according to existence technical parameters and to make the following calculations:
The software includes an option to calculate the distribution of phase to ground fault current values along the power line.
There are two options to calculate fault current:
2. Measured short-circuit on busbars
Set the current value of the calculated or measured current at the substation.
The calculation shows the value of single phase fault current for the line and allowed area of LLPD installation.
There are two options to calculate fault current:
- In accordance with power of transformer
2. Measured short-circuit on busbars
Set the current value of the calculated or measured current at the substation.
The calculation shows the value of single phase fault current for the line and allowed area of LLPD installation.
Evaluation of lightning performance is suitable for calculating the overhead power line lightning performance considering or not considering LLPDs at their different installation on section poles.
LLPD amount based on target lightning performance is suitable to determine the optimal LLPD number for achieving the required values of per annual outages
Lightning performance based on LLPD amount is suitable to define an appropriate installation of available LLPDs to achieve the minimum value of per annual outages.