High-voltage electrical characteristic parameter term
1. Rated voltage – This is the maximum voltage that a high-voltage switchgear can continuously operate under specified conditions of use and performance. It serves as a key parameter for determining the testing conditions required for high-voltage equipment.
2. Rated current – This refers to the maximum continuous current that the main circuit of the high-voltage switchgear can handle under normal operating conditions and performance specifications.
3. Rated frequency – This is the standard grid frequency at which the switchgear can operate continuously under normal use and performance conditions. It, along with the rated voltage and current, helps define the test conditions for the equipment.
4. Rated breaking current – This is the maximum short-circuit current that a circuit breaker can safely interrupt under specified conditions. It ensures reliable operation during fault scenarios.
5. Rated closing current – This represents the peak short-circuit current that the switch can withstand and successfully break under rated voltage and specified operational conditions.
6. Rated short-time withstand current (thermal stability current) – This is the root mean square (RMS) value of the current that the switch can carry in the closed position for a defined short period under specified conditions.
7. Rated peak withstand current (dynamic stability current) – This is the peak value of the first large half-wave of the rated short-time withstand current that the switch can endure while in the closed position.
8. Rated short-circuit duration (dynamic settling time) – This is the time interval during which the switch can carry the rated short-time withstand current in the closed position without damage.
9. Temperature rise – This measures the difference between the temperature of various parts of the switchgear when current flows through it and the surrounding ambient temperature. It indicates the thermal performance of the device.
10. Power factor (loop) – This is the ratio of resistance to inductive reactance in the equivalent circuit of the switchgear test setup, at power frequency, excluding the load impedance. It plays a role in determining the efficiency and performance of the system.
11. Rated short-duration power frequency withstand voltage – This is the standard effective value of power frequency voltage that the equipment can withstand during testing under specified conditions and for a given duration.
12. Rated switching (lightning) impulse withstand voltage – This is the standard surge voltage that the insulation of the equipment can endure during a withstand voltage test, simulating real-world lightning or switching events.
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