本帖最后由 DaoDao1997 于 2023-3-20 22:46 编辑
这个问题可以理解为"开关的关断时间对于有害电击的影响",这些安全防护的标准条例的制定依据是 IEC TS 60479-1 电流对人类和家畜的影响,开关的关断时间曲线要尽可能的在可接受范围内,IEC标准没有强制RCD脱扣时间小于0.1s的条文,但是它规定了剩余电流值和断路器动作时间的关系。
以下是施耐德电气安装手册的摘录:
IEC 60364-4-41 specifies the maximum operating time of protective devices used in TN system for fault protection: - For all final circuits with a rated current not exceeding 63 A with one or more socket-outlets, and 32 A supplying only fixed connected current-using equipment, the maximum disconnecting time will not exceed the values indicated in Fig. F19
- For all other circuits, the maximum disconnection time is fixed to 5 s. This limit enables selectivity between protective devices installed on distribution circuits
IEC 60364-4-41 specifies the maximum operating time of protective devices used in TT system for the protection against indirect contact: - For all final circuits with a rated current not exceeding 63 A with one or more socket-outlets, and 32 A supplying only fixed connected current-using equipment, the maximum disconnecting time will not exceed the values indicated in Fig. F13
- For all other circuits, the maximum disconnection time is fixed to 1 s. This limit enables selectivity between RCDs when installed on distribution circuits.
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RCCB (Residual Current Circuit Breaker) as defined in IEC 61008 series is a specific class of RCD. General type and S type (Selective) of IEC 61008 have tripping time/current characteristics as shown in Fig. F14. These characteristics allow a certain degree of selective tripping between the several combinations of ratings and types, as shown later in Coordination of residual current protective devices. Industrial type RCD according to IEC 60947-2 provide more possibilities of selectivity due to their flexibility of time-delaying.
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