1. Current transformers are classified according to the installation method
According to the installation method, the current transformer can be divided into through-type current transformer, pillar type current transformer, bushing type current transformer, and busbar type current transformer.
Through-type current transformer: A current transformer used to pass through a screen or wall.
Pillar type current transformer: a current transformer installed on a flat surface or pillar and used as a primary circuit conductor pillar.
Sleeved current transformer: a kind of current transformer that is directly mounted on the insulated sleeve without a primary conductor and primary insulation.
Busbar current transformer: a kind of current transformer that does not have a primary conductor but has a primary insulation, and is directly set on the bus.
2. Current transformers are classified according to their use
Current transformers are classified according to their applications, including current transformers for measurement and transformers for protection.
Current transformer for measurement: provides current information of the power grid to measurement, metering and other devices within the normal working current range.
Protection current transformer: In the case of a power grid fault state, it provides grid fault current information to relay protection and other devices.
3. Current transformers are classified according to insulating medium
Current transformers can be divided into dry-type current transformers, cast current transformers, oil-immersed current transformers, and gas-insulated current transformers according to the classification of insulating mediums.
Dry-type current transformer: It is insulated by ordinary insulating materials with impregnated paint.
Cast current transformer: A current transformer that is cast with epoxy resin or other resin mixtures.
Oil-immersed current transformer: It is insulated by insulating paper and insulating oil, which is generally an outdoor type, and is commonly used in various voltage levels in China.
Gas insulated current transformer: A current transformer whose main insulation is composed of gas.
4. Current transformers are classified according to the principle of current conversion
Current transformers can be classified as electromagnetic current transformers and photoelectric current transformers according to the conversion principle.
Electromagnetic current transformer: A current transformer that realizes current conversion according to the principle of electromagnetic induction.
Photoelectric current transformer: A current transformer that realizes current conversion through the principle of photoelectric conversion.
5. Current transformers are classified according to current ratio conversion
Current transformers can be classified into single current ratio current transformers, multi-current ratio current transformers and multiple core current transformers according to the current ratio conversion.
Single current ratio current transformer: that is, the number of turns of the primary and secondary windings is fixed, the current ratio cannot be changed, and only one current ratio conversion can be realized.
Multi-current ratio current transformer: that is, the number of turns of the primary and secondary windings can be changed, and the current ratio can be changed, so that different current ratio can be converted.
Multiple core current transformers: The transformer has multiple secondary windings with each core to meet the needs of different precision measurements and a variety of different relay protection devices. In order to meet the requirements of some devices, some of the secondary windings have multiple taps.
6. Current transformers are classified according to the location of the secondary winding
Current transformers are classified according to the location of the secondary winding, which can be divided into vertical current transformers and inverted current transformers.
Vertical current transformer: the secondary winding is in the lower part of the transformer, which is currently a common structural method.
Inverted current transformer: the secondary winding is on the upper part of the transformer, which is a new type of structure in recent years.
7. Current transformers are classified according to the number of turns of primary winding
Current transformers can be classified according to the number of turns of primary winding, which can be divided into single-turn current transformers and multi-turn current transformers.
Single-turn current transformer: commonly used for high-current transformers.
Multi-turn current transformer: Commonly used for medium and small current transformers.
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