⑴ at the installation site can be divided into indoor type and outdoor type. 35kV and below, made more indoor type; 35kV or more is made of outdoor type.
⑵ Press phases can be divided into single-phase and three-phase, 35kV and above can not be made of three-phase.
⑶ can be divided by the number of winding double and three-winding voltage transformers, three windingElectric transformer in addition to primary and basic secondary side, there is a set of auxiliary secondary side for ground protection.
⑷ Press insulation can be divided into dry type, cast type, oil-immersed and inflatable. Dry-type voltage mcb circuit breaker simple structure, no fire and explosion hazard, but a lower dielectric strength, applies only to the following indoor 6kV devices; cast voltage transformer, compact structure, easy maintenance, suitable for 3kV ~ 35kV indoor type distribution equipment; immersed voltage transformer insulation performance is good, can be used for more than 10kV outdoor power air circuit breaker; inflatable voltage transformer for SF6 fully enclosed appliances.
⑸ In addition, capacitor voltage transformers, capacitor voltage transformer is actually a single-phase capacitor divider tube consists of several identical capacitors in series, connected to the high voltage between phase and ground, it is widely used 110kV ~ 330kV neutral point directly grounded grid.
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