Today, We will learn about What is CT in a transformer?, What is the CT working principle?, What does a CT measure?
What is CT in a transformer?
A current transformer (CT) in a transformer is an instrument transformer used to measure alternating current (AC) in an electrical circuit. It works based on the principle of electromagnetic induction. The CT consists of a primary winding, through which the current to be measured passes, and a secondary winding, which produces a current proportional to the primary current but reduced in amplitude. This secondary current is then used for measurement or protection purposes.
What is the CT working principle?
The working principle of a CT scan involves Faraday’s law of electromagnetic induction. When an alternating current flows through the primary winding of the CT, it creates a varying magnetic field around the primary winding. This changing magnetic field induces a voltage in the secondary winding according to Faraday’s law. The magnitude of the induced voltage is proportional to the rate of change of the primary current and the number of turns in the secondary winding.
What does a CT measure?
A CT measures the current flowing through the conductor or primary winding. It provides an isolated secondary current which is directly proportional to the primary current. This secondary current is typically in the milliampere range and is used for measurement, control, or protection purposes in electrical systems.
CTs and PTs (potential transformers) are often used together in power systems. While the CTS measures current, the pts measure voltage. Together they provide the signals needed for protection, measurement and control in power systems. CTs and PTs are crucial components in various applications, including protective relays, energy meters, and supervisory control and data acquisition (SCADA) systems.
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