Current Transformer

Current Transformers, also known as instrument transformers, are the collective term for current transformers and voltage transformers. It can turn high voltage into low voltage and large current into small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, all refer to rated value), in order to realize the standardization and small size of measuring instruments, protection equipment and automatic control equipment. Chemical. At the same time, the transformer can also be used to separate high voltage systems to ensure the safety of people and equipment.

Main classification

Transformers are divided into two major categories: voltage transformers and current transformers. Voltage transformers can be used for voltage and power measurements in high voltage and ultra high voltage power systems. Current transformers can be used for the measurement of exchange currents, the measurement of exchanged electrical power, and the protection of electrical drag lines.

Main role

The function of the transformer is to reduce the AC voltage and the large current proportionally to the value that can be directly measured by the meter, which is convenient for the meter to directly measure and provide power for relay protection and automatic devices. The transformer for power system is a special transformer that transmits the information of high voltage and high current of the grid to the metering, measuring instrument and relay protection and automatic device of the secondary side of low voltage and small current. It is a primary system and a secondary system. The contact element has its primary winding connected to the grid, and the secondary winding is respectively connected to the measuring instrument, the protection device and the like.

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