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How can voltage transformers be classified?
Voltage transformers can be classified according to the following five conditions:
(1) According to the installation location, it can be divided into indoor and outdoor. 35kV and below are mostly made indoors; above 35kV are made outdoor.
(2) According to the number of phases, it can be divided into single-phase and three-phase, and 35kV and above cannot be made into three-phase.
(3) According to the number of windings, it can be divided into two-winding and three-winding voltage transformers. In addition to the primary side and the basic secondary side, the three-winding voltage transformer has a set of auxiliary secondary sides for grounding protection.
(4) According to the insulation method, it can be divided into dry type, cast type, oil immersed type and inflatable type. The dry voltage transformer has simple structure, no fire and explosion hazard, but low insulation strength. It is only suitable for indoor units below 6kV. The cast voltage transformer is compact and easy to maintain. It is suitable for indoors from 3kV to 35kV. Power distribution device; oil-immersed voltage transformer has good insulation performance and can be used for outdoor power distribution devices above 10kV; inflatable voltage transformers are used in SF6 fully enclosed electrical appliances.
(5) In addition, there is a capacitive voltage transformer. The capacitive voltage transformer is actually a single-phase capacitor divider. It consists of several identical capacitors connected in series, connected between the high-voltage phase line and the ground. It is used in the power grid where the neutral point of 110kV～330kV is directly grounded.