A CT must withstand, without damage, the thermal effects of a large short-circuit current for a specified duration (usually 1 or 3 seconds). This parameter ensures the CT can survive a fault before circuit breakers operate.
This duality ensures that a single substation can simultaneously perform accurate billing measurement and reliable fault detection using different CTs on the same power line. norma iec 61869-2
The standard specifies the . This is the maximum current the transformer can carry continuously without exceeding its temperature rise limits (e.g., a typical limit might be a 60K or 75K rise above ambient). This ensures the insulation does not degrade due to overheating during routine operations. A CT must withstand, without damage, the thermal
By merging these, the new standard ensures a more cohesive approach to designing and testing CTs for both steady-state and transient conditions. 3. Key Technical Requirements The standard specifies the