TY - JOUR
T1 - Investigation on Shielding Failure of a Novel 400-kV Double-Circuit Composite Tower
AU - Wang, Qian
AU - Jahangiri, Tohid
AU - Bak, Claus Leth
AU - Silva, Filipe Miguel Faria da
AU - Skouboe, Henrik
PY - 2018/4
Y1 - 2018/4
N2 - In this paper, the lightning shielding performance of a newly-designed 400 kV double-circuit composite tower is investigated. Based on a revised EGM method, traditional shielding failure regions, located at both sides of a traditional tower is no longer a big issue for the fully composite tower, due to its unusual ‘Y’ configuration. Instead, a new unprotected region exists in the tower center. The maximum lightning current that can lead to shielding failure and the shielding failure rate (SFR) of the new tower are calculated. To verify results from the revised EGM method, a scale model test is conducted. Spatial shielding failure probability around the tower is calculated based on ratio of discharge paths recorded in the test. Moreover, based on test results, the maximum shielding failure lightning currents are obtained. Analysis and results derived from the revised EGM method and scale model test have a small deviation, verifying the feasibility of these two methods in the lighting performance evaluation of the fully composite tower. Both methods confirm that the unusual negative shielding angle of —60 in the newly composite pylon provides good lightning shielding performance. The feasibility of the novel composite tower is verified.
AB - In this paper, the lightning shielding performance of a newly-designed 400 kV double-circuit composite tower is investigated. Based on a revised EGM method, traditional shielding failure regions, located at both sides of a traditional tower is no longer a big issue for the fully composite tower, due to its unusual ‘Y’ configuration. Instead, a new unprotected region exists in the tower center. The maximum lightning current that can lead to shielding failure and the shielding failure rate (SFR) of the new tower are calculated. To verify results from the revised EGM method, a scale model test is conducted. Spatial shielding failure probability around the tower is calculated based on ratio of discharge paths recorded in the test. Moreover, based on test results, the maximum shielding failure lightning currents are obtained. Analysis and results derived from the revised EGM method and scale model test have a small deviation, verifying the feasibility of these two methods in the lighting performance evaluation of the fully composite tower. Both methods confirm that the unusual negative shielding angle of —60 in the newly composite pylon provides good lightning shielding performance. The feasibility of the novel composite tower is verified.
KW - Fully composite tower
KW - Revised EGM method
KW - Scale model test
KW - Lightning shielding performance
U2 - 10.1109/TPWRD.2017.2716383
DO - 10.1109/TPWRD.2017.2716383
M3 - Journal article
SN - 0885-8977
VL - 33
SP - 752
EP - 760
JO - I E E E Transactions on Power Delivery
JF - I E E E Transactions on Power Delivery
IS - 2
ER -