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.
This current transformer is indoor cast resin insulated and adopts totally enclosed structure. It's used for measurement of current and power, and relay protection in AC power supply system with rated frequency 50/60HZ, rated voltage 12kV and below.
This type of current transformer is used for metering and protective relaying for installation in indoor up to 12kV rated voltage frequency 50/60HZ. It is especially suitable for the fixed narrow case ring-net work switchgear.
This current transformer is a steel tank oil-immersed type. Our current transformer can be used for current and electric energy measurement and relaying protection in power system with the frequency of 50/60HZ. It carries out the long operation under the conditions for 20% of rated current. It is used in the field of altitude not exceed 4000m, and max. change of ambient temperature not exceed -25 to +40℃.
This current transformer is a cast resin and fully enclosed current transformer. It is used to measure electric energy and current, and protect relay in the electric system up to rated frequency 50/60HZ and rated voltage 35kV. It accords with IEC185 and GB1208-1997.
This kind of current transformer is oil insulated and outdoor. It is used to measure energy and current, and protect relay in electric system up to rated frequency 50/60HZ and rated voltage 35kV.
This current transformer is a cast resin and fully enclosed type. It is used to measure electric energy and current, and protect relay in the electric system of rated frequency 50/60HZ and rated voltage 12kV. It accords with IEC44-1:1996 and GB1208-1997.
This current transformer is support epoxy resin insulated. It is used for metering current and power, and protecting relay in power system with rated frequency 50/60HZ, rated voltage 12kV.
This current transformer is oil insulated and outdoor using. It is used for metering electric energy and current, and protecting relay in electric system up to rated frequency 50/60HZ and rated voltage 35kV.
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!