April 2020
Intermediate
296 pages
7h 37m
English
Content preview from Current Interruption Transients Calculation, 2nd Edition
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1Introduction
1.1 Background
The intent of this textbook is to explain the origin and nature of the transients associated with fault and inductive and capacitive load current interruption. The transients in general have a power frequency and an oscillatory component. The oscillatory components have a RLC circuit basis with such a degree of commonality between the above current interruption cases that a generic calculation approach is possible. The power frequency component is either a balanced or momentarily unbalanced quantity and, in some cases, is the axis of oscillation for the oscillatory component. In overview, the following transients will be analyzed and the resulting equations applied to real current interruption cases:
- Fault current interruption: The transient of interest is the transient recovery voltage (TRV) that appears across the circuit breaker after current interruption. For terminal faults, i.e. a fault at the circuit breaker, the power frequency component is dependent on the system earthing and the type of fault. The oscillatory component can be either overdamped or underdamped with traveling waves contributing to the former oscillation. The TRV may be on one side of the circuit breaker only, for example, a three‐phase‐to‐earth fault on an effectively earthed system, or on both sides of the circuit breaker as for the out‐of‐phase switching and short‐line fault cases.
- Inductive current interruption: The transients for consideration in this case are the TRV, ...
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