Miniature current transformers are important components for a variety areas of industry. According to the Chinese Industry Standard, many technical terms have been defined. Here we introduce some of these terms and give detail explain.
Instrument transformer is a type of transformer that is used for instruments, meters, relays or some other similar electrical devices.
Current transformer is a type of instrument transformer that is designed to produce an alternating current in its secondary winding which is proportional to the current in its primary while proper used. Its phase displacement is nearly 0 while wiring method is correct.
Primary winding is a winding forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit.
Secondary winding is a winding such that current is induced in it by passing a current through the primary coil, and act as the source of measuring instruments, meters, relays or other similar electrical devices.
Rated frequency is frequency required or stipulated by some standards.
Rated Primary Current
Rated primary current is the primary current value act as the standard of performance for current transformers.
Rated Secondary Current
Rated secondary current is the secondary current value act as the standard of performance for current transformers.
Maximum Current ( Imax )
Maximum current is the maximum working current of instrument transformer within it’s accuracy class.
Miniature Current Transfromer
Miniature current transformer is a current transformer with rated secondary current no more than 100mA.
Actual Transformation Ratio
Actual transformation ratio is the ratio of primary current to secondary current at work.
Rated Transformation Ratio
Rated transformation ratio is the ratio of rated primary current to rated secondary current.