400/5A Ring-Type Current Transformer (CT)

About 400/5A Ring-Type Current Transformer (CT)

The 400/5A Ring-Type Current Transformer is an electrical measuring transformer used for accurate current measurement and monitoring in AC power systems. The conductor or busbar carrying the primary current passes through the CT's central opening, while the transformer produces a proportional 5 A secondary output for connection to suitable metering or monitoring equipment.

This particular unit is marked 400/5 A, Class 1, 5 VA, 50 Hz, with an 11 kV insulation-level marking and an 800 V line rating shown on the product label. It is manufactured in a compact ring/toroidal construction and is suitable for applications where electrical current needs to be monitored without directly connecting high current to the measuring instrument.

Powertrac's catalogue describes its CT range as suitable for energy meters, panel instruments and transducers, with applications including distribution systems, generator control panels, single- and three-phase circuits, billing/sub-metering and substation monitoring.

Main Specifications

The 400/5 A ratio means that when approximately 400 A flows through the primary conductor, the CT provides approximately 5 A on its secondary side, subject to the CT's operating conditions and accuracy specifications.

Uses / Applications

• Energy metering supplies a scaled current to energy meters.
• Electrical panel monitoring monitors current flowing through feeders and circuits.
• Power distribution systems used for measuring current in distribution equipment.
• Control panels provides current signals to measuring and monitoring instruments.
• Generator panels helps monitor generator output current.
• Sub-metering useful for monitoring individual electrical loads or sections.
• Switchgear systems provides current measurement for electrical equipment.
• Industrial power monitoring helps monitor electrical loads and power consumption.
• Protection and control circuits CT secondary signals can be used with appropriate protection/control equipment