In power lines, the current difference from a few to a few thousand, voltage difference from several volts to several million volts. The current voltage in the line is high, so it is very dangerous to measure directly. To facilitate the conversion of the secondary instrument to a uniform current voltage, the Transformer is used to change current pressure and isolate electricity.
The instruments are mostly needle-type current voltmeters, so the secondary current of the current Transformer is mostly amped-grade(E. G. 5). With the development of the times, most of the power measurements have reached the digital, and the computer sampling signal is usually mA(0-5V, 4-20mA, etc.). The secondary current of the micro current Transformer is milliampere, which acts as a bridge between the large Transformer and the sample. The miniature current Transformer is called the "current Transformer for equipment". (`` Instrument Current Transformer "has a meaning that is used in laboratories for multicurrent than precise current Transformers, generally used to extend the meter range.
Item | Technical data | ||||||||||||
Rated voltage (KV) | 3.6 | 7.2 | 12 | 24 | 40.5 | ||||||||
Rated frequency(Hz) | 50 | ||||||||||||
Insulator(capacity) | insulating | Frequency withstand voltage 5 min (KV) | 25 | 32 | 42 | 68 | 100 | ||||||
Frequency withstand voltage 1 min (V) | 2000 | ||||||||||||
Lighting impulse withstand voltage (KV) | 40 | 60 | 75 | 125 | 185 | ||||||||
Local discharge (pc) | ≤10 | ||||||||||||
Dispute bend (N) | ≥1000 | ||||||||||||








