Today, We are about to learn What is CT and its type?, What is wound type CT?, What are the different types of CTs?
What is CT and its type?
A CT, or current transformer, is an electrical device used to measure alternating current (AC) in an electrical circuit by producing a proportional current in its secondary winding, which is proportional to the current flowing in its primary winding. CTs are commonly used for measurement, protection and control purposes in power systems and electrical equipment. There are different types of CTS, including solid core CT, split core CT, and wound type CT, each designed for specific applications and installation requirements.
A wound type CT, also known as a primary wound CT, is a type of current transformer where the primary winding consists of several turns of wire wound around a magnetic core. The secondary winding is connected to a measuring or protection device and produces a current proportional to the current flowing in the primary winding. Wound type CTs are commonly used in high precision measurement applications and to measure higher currents than solid core or split core CTs.
What is wound type CT?
There are different types of CT used in electrical systems and equipment, each designed for specific applications and installation requirements. These include solid core CTS, split core CTS, wound type CT, ring CTS, bar type CT, and multi-ratio CT. Solid core CTs have a solid core and are typically used for high precision measurement applications. Split core CTS have a hinged or split core for easy installation around existing conductors. The CTS wound type has a primary wound winding to measure higher currents. The CTS ring is installed inside electrical equipment such as transformers and circuit breakers. Bar type CTs are installed around bars or conductors. Multi-ratio CTs have multiple TAP settings to provide different current ratios.
What are the different types of CTs?
The three main types of current transformers are ratio current transformers, protection current transformers and special purpose current transformers. Ratio current transformers are used for metering and metering purposes and are designed to provide precise current ratios between the primary and secondary windings. Protective current transformers are used for protective relay applications and are designed to provide accurate current signals to detect faults and anomalies in the power system. Special purpose current transformers are designed for specific applications or environments and may have unique features or characteristics tailored to the application requirements.
Current transformers are classified based on their accuracy, load, and demand requirements. The accuracy class of a CT indicates its level of accuracy in measuring current, with higher accuracy classes providing more precise measurements. Common accuracy classes for CTS include class 0.1, class 0.2, class 0.5, class 1.0, class 3.0, and class 5.0. The burden of a CT refers to the electrical load imposed on the secondary winding by connected measuring or protection devices, and it influences the performance and accuracy of the CT. Different CT classes are selected based on specific application requirements, such as accuracy, load, frequency response and environmental conditions.
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