Switching circuits transient models

The distribution line, the pole, and the home appliances in the house shown in Figure 6.16 can be represented by horizontal and vertical distribution line models and lumped parameter circuits [27,28]. The grounding electrodes of the pole, the telephone line SPD, and the home appliances, if grounded, are modeled by a combination of a distributed line and a lumped parameter circuit to simulate the transient characteristic [29]. However, this section adopts a simple resistance model with a resistance value taken from the experiments discussed in References 29 and 30, as the vertical grounding electrode used for a home appliance is short and the transient period is much shorter in the phenomenon investigated in this chapter. A protection device (PD) is installed in a home appliance, and the NTT SPD is represented by a time-controlled switch prepared in the EMTP [31]. 

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