245kV маслонаполненные Трансформатор тока

245kV Oil-filled Current Transformers Highest system voltage245kVRaetd primary current1 3000ARated secondary current1A or 5AAccuracy class of the windings for measurement0.2S,0.2,0.5S,0.5Accuracy class of the windings for protect5P, 10P, 5PR, 10PR,TPYNo. of the secondary widings1 8Rated output5 50VASecurity factor of the instrument(Fs)5, 10Accuracy limit coefficient5, 10，15，20，25，30，40Temperature rise limitthe max temperature rise should not be more than 65KRated short-time thermal current(Ith) and dynamic stable current(Idyn)Ith=50kA(4S); Idyn=125kA(peak) 245kV oil-filled current transfromer is hermetically sealed consists of internal parts,a bushing, a metallic expansion and a tank. The internal parts consist of a primary winding and secondary windings from 2 to 8. The shape of the primary winding likes a U. The high voltage insulation made by a kind of special insulating machine which is subdivided by many conductive lyers. The special design and careful process warrant for the main insulation，the electrical insulation strenth is high, and the dielectric loss factor（tgδ）and partial discharge is low. The primary winding is divided into two. The output lines are located on the outside of the bushing. This kind of structure can warrant the current transformers to change the ratio. The secondary windings are located at the Secondary winding around the system in cold-rolled silicon steel sheet (or AMD chip Jing-he) rolled on the ring core can be located intermediate tap, with a winding string, parallel, access to a wide range of current changes. The second lead in the fuel tank by a positive lead to the junction box, dielectric loss at the end of grounding wire tap-ping with separate sets of small porcelain to bring out the base fuel tank with check valve oil, each with a set of 3 oil pick-and-place-specific tools, transformer sealing parts are sealed limit. LB series oilpaper current transformer is a kind of current transformer with high-performance parameters, the main features are: high current, variable ratio, high measurement accuracy class, high dynamic performance of thermal stability, high accuracy limit factor, and the insulation margin is large, the main technical indicators have reached international advanced level.