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Circuit Breaker Terms Definition

The document outlines key specifications of the Siemens 145kV circuit breaker, including rated voltage, frequency, and current capacities. It details the circuit breaker's performance metrics such as breaking capacities, making capacity, and operational duty cycles. These specifications are essential for understanding the circuit breaker's capabilities in various fault conditions.

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Dharmendra V Mahida
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21 views2 pages

Circuit Breaker Terms Definition

The document outlines key specifications of the Siemens 145kV circuit breaker, including rated voltage, frequency, and current capacities. It details the circuit breaker's performance metrics such as breaking capacities, making capacity, and operational duty cycles. These specifications are essential for understanding the circuit breaker's capabilities in various fault conditions.

Uploaded by

Dharmendra V Mahida
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Here we will discuss some important terms on the nameplate of Siemens

145kV circuit breaker:

1. **Rated Voltage (145 kV):** This is the voltage level for which the
circuit breaker is designed to operate safely.

2. **Rated Frequency (50 Hz):** This is the frequency of the alternating


current (AC) system for which the circuit breaker is designed.

3. **Rated Normal Current (2003 A):** This is the maximum continuous


current that the circuit breaker can carry under normal operating
conditions without tripping.

4. **Rated Impulse Withstand Voltage (650 kV):** This is the maximum


voltage that the circuit breaker can withstand for a short duration without
damage during a lightning impulse.

5. **Rated Symmetrical Breaking Capacity (40 kA):** This is the maximum


current that the circuit breaker can safely interrupt under symmetrical
(balanced) fault conditions.

6. **Rated Asymmetrical Breaking Capacity (45.6 kA):** This is the


maximum current that the circuit breaker can interrupt under
asymmetrical (unbalanced) fault conditions.

7. **Rated Short-Time Current (40 kA, " sec):** This is the maximum
current the circuit breaker can safely interrupt under short-duration fault
conditions.

8. **Making Capacity (100 kA):** This is the maximum current the circuit
breaker can withstand during the closing operation.

9. **Rated Operating Duty (0-0.35-CO-5min-CO):** This indicates the


sequence of operations or duty cycle the circuit breaker is designed for.

10. **Total Break Time at Rated Breaking Current (60 ms):** This is the
total time taken by the circuit breaker to open and interrupt the circuit
when operating at the rated breaking current.

11. **Rated Single Capacitor Bank Breaking Current (315 A):** This is the
maximum current the circuit breaker can interrupt when breaking a single
capacitor bank.

12. **Rated Capacitor Inrush Making Current (16 kA):** This is the peak
current the circuit breaker can withstand when energizing a capacitor
bank.

13. **Out-of-Phase Breaking Current (10 kA):** This is the maximum


current the circuit breaker can interrupt when the current is out of phase
with the voltage.
14. **Amplitude Factor:** This could refer to a factor used in calculating
the breaking capacity of the circuit breaker based on the shape of the
current wave.

15. **Rate of Rise (2 kV/μs):** This represents the rate at which the
voltage across the circuit breaker terminals rises during a fault condition.

16. **First Pole to Clear Factor (1.5):** This factor indicates the ratio of the
time taken by the first pole to clear a fault to the total time taken by all
poles to clear the fault.

These specifications provide detailed information about the performance


and capabilities of the Siemens 145kV circuit breaker under various
operating conditions...

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