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 test conditions during high-voltage testing.

2. Rated Current – This refers to the continuous current that the main circuit of the high-voltage switchgear can carry under normal operating conditions and specified performance criteria.

3. Rated Frequency – This is the standard grid frequency that the equipment can operate at continuously, under normal usage and performance conditions. It plays a crucial role in defining the test conditions alongside rated voltage and current.

4. Rated Current Breaking Capacity – This represents the maximum short-circuit current that a circuit breaker can safely interrupt under specified conditions.

5. Rated Short-Circuit Closing Current – The highest peak short-circuit current that the switch can withstand and successfully break under rated voltage and specified operating conditions.

6. Rated Short-Time Withstand Current (Thermal Stability Current) – This is the root mean square (RMS) value of 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 Stabilization Time) – This is the time interval during which the switch can carry the rated short-time withstand current while in the closed position.

9. Temperature Rise – This measures the difference between the temperature of various components of the switchgear when current is flowing and the surrounding ambient air temperature.

10. Power Factor (Loop) – This is the ratio of resistance to inductive reactance at power frequency in the equivalent circuit of the switchgear test setup, excluding the load impedance.

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 time duration.

12. Rated Operation (Lightning) Impulse Withstand Voltage – This is the standard surge voltage level that the insulation of the equipment can tolerate during an impulse withstand voltage test, whether from switching operations or lightning strikes.

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