Rated Capacity: Refers to the permissible load power on the secondary side (common values include 2.5 VA, 5 VA, 10 VA, etc.); the actual secondary load should be maintained between 25% and 100% of the rated capacity.
Dynamic and Thermal Stability Currents: Thermal stability current refers to the RMS value of the short-circuit current that can be withstood for one second (e.g., 50 kA); dynamic stability current is a peak value-typically 2.5 times the thermal stability current-and must be verified against short-circuit calculation results.
Rated voltage: Must not be lower than the rated voltage of the connected circuit. Common medium-voltage ratings are 10 kV and 12 kV; for example, the LZK-10W has a rated insulation level of 12/42/75 kV (maximum operating voltage of 12 kV).
Rated primary/secondary current: The primary current range typically spans from tens to thousands of amperes (e.g., 160–1250 A, 1000–5000 A), while the standard secondary current is 5 A or 1 A.
Accuracy class: Common classes for metering include 0.2, 0.5, and 1 (classes with an "S" suffix, such as 0.2S or 0.5S, indicate higher accuracy at light loads); classes for protection include 5P and 10P, where the number following the "P" represents the accuracy limit factor (e.g., 10P10 indicates a composite error of ≤10% at 10 times the rated current).
