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gui chao cable news: on the conductor icing dancing, overloading, ice flashover failure
from：guichao author：admin click： 318 addtime：2017-04-06 10:34:12
under the severe cold weather, ice dancing, overloading, ice flashover can easily lead to the following failure:
(1) the conductor galloping occurs when the transmission line is icing;
(2) the ice melts, easily formed on the surface of the ice bridge insulator, if the insulator pollution is serious, prone to icing flashover;
(3) the overload of the ground wire will cause the pressure deformation of the tower head and the collapse of the tower.
in view of the above situation, the main measures to be taken are as follows.
(1) galloping prevention. in the line of the dance section of the installation of anti dancer, improve the threshold of the occurrence of dancing,
the amplitude and intensity of conductor galloping can be effectively suppressed, and a series of insulator strings are installed in each phase of the double string (porcelain or glass) insulator in the dancing section,
to prevent the occurrence of double string insulator collision damage due to galloping (uhv situation slightly better).
(2) ice flashover prevention. one is to take the way of inserting flowers, which is in the middle of each string insulator, each of the 3 pieces (or 5) inserted 1 pieces of straw hat type insulator market size,
in order to prevent the ice bridge insulator string, preventing ice flashover; insulator string two is inverted v transformation, in the guarantee of conductor and tower air clearance at the same time,
long insulator strings can be lengthened to improve insulation strength.
(3) for the accident of power grid safety caused by icing overload, such as the earth wire bracket yield, the earth string moving, the ground wire disconnection and so on,
the main measures taken: to increase the strength of the ground wire, hardware and other equipment, to prevent the wire from the ground wire, ground wire sliding channeling, drop;
strengthening of the tower components, such as strengthening the ground support;
shortening the length of the length of the wire and improving the stress condition.
(4) the installation of online monitoring devices in key sections should also be carried out for a long time to observe and accumulate data, so as to guide the prevention of ice disaster in the future.