[3D ENGLISH] What is Inside of High-voltage Current transformer / CT

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A high voltage current transformer (HVCT) is a specialized instrument transformer used in electrical power systems to measure or monitor high currents. It is designed to step down high currents to a level suitable for measurement or protection devices.

The primary purpose of a current transformer (CT) is to provide an accurate representation of the current flowing through a power circuit. This is achieved by passing the primary conductor (carrying the high current) through the center of the current transformer's core. The core is typically made of a high-permeability material such as iron or silicon steel, which helps concentrate the magnetic field generated by the current.

The primary winding of the HVCT is connected in series with the power circuit, and the secondary winding is connected to measurement or protection devices. The turns ratio between the primary and secondary windings determines the transformation ratio of the CT. For example, if the CT has a turns ratio of 1000:1 and the primary current is 10,000 A, the secondary current will be 10 A.

High voltage current transformers are typically used in applications such as:

Metering and billing: HVCTs provide accurate measurements of current for metering purposes, allowing utility companies to determine energy consumption and bill customers accordingly.

Protection and control: HVCTs play a crucial role in protective relay systems, which detect faults and abnormal conditions in power systems. By providing current information, HVCTs enable relays to initiate protective actions, such as tripping circuit breakers to isolate faulty sections of the system.

Monitoring and diagnostics: HVCTs can be used to monitor and analyze power quality parameters, detect power disturbances, and perform diagnostics on power system components.

Due to the high voltages involved, HVCTs are designed to withstand the electrical stresses and insulation requirements of the system. They are typically enclosed in an insulating housing to ensure safety and reliability.

It's worth noting that specific requirements for high voltage current transformers can vary depending on the application, standards, and regulations in different countries or regions.