General Description
1. Current transformer, also referred to asinstrument transformer, is used to convert high AC current to small, easilymanageable value.
2. Current transformer is mainly composed of primary winding, secondary winding,magnetic core and insulated body. It is manufactured without primary winding ifit has no bus bar. Instead, it is possible to constitute primary winding bypassing conductor or bus bar inside toroidal core oftransformer.
3. Furthermore, the secondary terminals are under a transparent cover. Lowvoltage current transformer is manufactured as of two types for measuring andprotection.

Measuring Current Transformer
1. It is manufactured to feed on other low voltage apparatus such asmeasuring instrument, relay, watt-hour meter.(kWmeter).
2. This type of current transformer is mainly used 0.5 and 1 class to transferthe current from high rated current to rated secondary current.

Protection current transformers
1. It is constructed to feed the protection relay.
2. This type of current transformer is mainly used class 3.0(Customer suppliedwhen required)

TechnicalCharacteristics

Notes:
1. Ratio error of current transformer can be guaranteed between 100% and 120%of rated current.
2. Error class can be 2-3 folding, especially the value of the under half ratedcurrent at the application, load current can be taken into considerationbetween In-1.2In.

Current Errors andPhase Shift In Measuring Current Transformer

Current Errors and Phase Shift In Protection CurrentTransformer: [Fault Conditions]

Device Power Which Connected to Current Transformers