What is a current transformer (CT)?
1 Answer
As of my last knowledge update in September 2021, a current transformer (CT) is a type of electrical instrument used to measure alternating current (AC) by transforming the primary current passing through its primary winding into a secondary current, which is proportional to the primary current but scaled down in magnitude. CTs are commonly used in various applications, including power systems, industrial settings, and metering, to provide accurate and safe measurement of high currents without directly connecting measurement devices to the high-current circuit.
The basic principle of operation involves passing the primary conductor (the current-carrying conductor) through the center of the CT's core, which is typically made of a magnetic material. The primary winding is connected in series with the circuit carrying the current to be measured. The secondary winding is wound around the core and connected to measuring instruments or relays. The secondary current is then a scaled-down version of the primary current, and the transformation ratio between primary and secondary currents is determined by the winding turns ratio.
CTs are often used in conjunction with other instruments, such as ammeters, wattmeters, or protective relays, to monitor and control currents in power systems. They provide isolation between the high-current circuit and the measurement or protection circuit, enhancing safety and accuracy.
It's important to note that technology and terminology can evolve over time, so there might have been developments or changes in CT technology since my last update. I recommend checking more recent sources or industry references to get the latest information on current transformers and their applications.
The basic principle of operation involves passing the primary conductor (the current-carrying conductor) through the center of the CT's core, which is typically made of a magnetic material. The primary winding is connected in series with the circuit carrying the current to be measured. The secondary winding is wound around the core and connected to measuring instruments or relays. The secondary current is then a scaled-down version of the primary current, and the transformation ratio between primary and secondary currents is determined by the winding turns ratio.
CTs are often used in conjunction with other instruments, such as ammeters, wattmeters, or protective relays, to monitor and control currents in power systems. They provide isolation between the high-current circuit and the measurement or protection circuit, enhancing safety and accuracy.
It's important to note that technology and terminology can evolve over time, so there might have been developments or changes in CT technology since my last update. I recommend checking more recent sources or industry references to get the latest information on current transformers and their applications.