Switching overvoltages

Xl = power frequency inductive reactance of the circuit. Switching overvoltage... 

The number of thyristors in series, each selected for an impulse voltage of a little less than the impulse voltage with.stand level of the terminal equipment (Table 11.6) can effectively limit the switching overvoltages within desired safe limits. Then connecting them in anti-parallel will mean that the voltage will be forward for either of... 

The EMTP has been widely used all over the world as a standard simulation tool for transient analysis not only in a power system, but also in an electronic circuit. The BPA of the U.S. Department of the Interior (later U.S. Department of Energy) started to develop a computer software for analyzing power system transients, especially switching overvoltage from the... 

When a number of generators, transformers, and/or transmission lines are connected to the bus in Figure 2.4, the source impedance = jcoL becomes very small. Such a bus is called an infinite bus, and the source circuit becomes equivalent to the ideal source in Figure 2.2. A switching overvoltage generated in the infinite bus case is the severest, as observed from Figure 2.3. 

Statistical distribution curves of maximum switching overvoltages (< =150 km, Lj=50mH in Figure 1.22). (a) Uniform distribution (Figure 2.12a), x measured distribution ((c)-l), measured distribution ((c)-2). (b) Gaussian distribution (Figure 2.12b). 

Distribution characteristics of maximum switching overvoltages (0 =90° C=150km, =50mH). 

The reason for the seven cases in the telecommunication equipments is estimated due to switching overvoltages higher than the voltage defined in a standard or the parts that are not defined in a standard [15,16]. 

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