Current Transformer

In electrical engineering, a current transformer (CT) or electrical current transformer is used to measure electric currents. Current transformers can be divided into AC current transformers and DC current transformers. Current transformers, together with voltage transformers (VT) or potential transformers (PT), are called instrument transformers. When current in a circuit is too high to directly apply to measuring instruments, a current transformer produces a reduced current accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments. A current transformer can also isolate the measuring instruments from what may be very high voltage in the monitored circuit. Current transformers are commonly used in metering and protective relays in the electrical power industry.

Usage
Current transformers are used widely for measuring current and monitoring the operation of the power grid. Along with voltage leads, revenue-grade current transformers drive the electrical utility's watt-hour meter on virtually every building with three-phase service, and every residence with greater than 200 amp service.
The CT is typically described by its current ratio from primary to secondary. Multiple current transformers are usually installed as a stack for various uses. For example, protection devices and revenue metering may use separate current transformers. Stacking them provides severability while consolidating the high voltage interface. Similarly, potential transformers such as the CVT are used for measuring voltage and monitoring the operation of the power grid.

As a professional current transformer manufacturer in China with more than 20 years of production experience, we understand the importance of product quality. For this reason, our current transformers, circuit breakers, break switches and other products have been certified by KEMA, GOST, CCC, TUV, WTGS and CB. They are reliable in quality and have been exported to more than 30 countries and regions, such as America, Germany, Russia, Iran, South Africa and Argentina. Huayi Electric Co., Ltd. sincerely welcomes all customers to visit our company!