Secondary winding is the output coil in a current transformer that produces a reduced current proportional to the primary current for measurement and protection.
The secondary winding in a current transformer is a precisely wound coil of insulated copper wire that forms the output circuit. It is designed to produce a standardized secondary current (typically 1A or 5A) that is directly proportional to the primary current flowing through the transformer's core. This component enables safe measurement, monitoring, and protection of high-current systems by isolating measurement circuits from high-voltage primary circuits.
该组件会出现在以下整机或工业产品中。
诱因 → 失效模式 → 工程缓解
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Open-circuiting the secondary winding creates dangerously high voltages that can damage insulation, cause arcing, and pose serious safety hazards. Current transformers must never operate with an open secondary circuit.
1A secondary windings have more turns and are used for long-distance transmission with lower power loss, while 5A secondary windings have fewer turns and are common for local measurement with standard instruments.
Accuracy class (0.2, 0.5, 1, etc.) indicates the maximum percentage error at rated current. Class 0.2 has ±0.2% error for metering, while Class 5 has ±5% error for protection applications.
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