Current transformer secondary side open circuit fault cause judgment and treatment - Database & Sql Blog Articles

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1. The primary winding of a current transformer is directly connected to the main current loop. When the secondary side is open, no current flows through it, while the primary current remains unchanged. This causes a rapid increase in magnetic flux within the core, potentially leading to saturation. Such a sharp rise in flux can generate dangerously high voltages across the open secondary winding, posing serious risks to both personnel and equipment. 2. Common signs of an open circuit on the secondary side of a current transformer include frequent triggering or failure to reset of zero-sequence and negative-sequence current protection systems, unexpected activation of differential protection, abnormal readings on ammeters (such as a drop to zero), reduced indications on active and reactive power meters, slower energy metering, occasional sparks or smoke at the open point, and unusual clicking sounds from the current transformer. These symptoms may not all appear simultaneously, as they depend on the specific load applied to the secondary winding and the nature of the open circuit. 3. Steps for handling an open circuit on the secondary side of a current transformer: 3.1 Identify which group of secondary windings is affected based on the observed fault symptoms. If the affected winding is used for protection, immediately disable the protective devices that could malfunction due to the issue. 3.2 Inspect the secondary circuit components, such as relays, instruments, and terminal blocks, for any visible signs of damage, discharge, or smoke. 3.3 If no obvious faults are found, use insulated tools like an electroscope to carefully touch and press on terminals and other parts. Look for signs of looseness, overheating, or abnormal signals. Always use appropriate insulated safety gear, such as insulated gloves, that match the voltage level of the system being tested.