Battery Fault Protection

Data Power Solutions Quick Start Guide

•A fault protection device (such as a circuit breaker or fuse) must be fitted in series with one of the battery cables of each battery string.

•The fault protection device must be:

•Located as close as practical to the corresponding battery string output terminal, and

•Capable of disconnecting the potential fault current of the battery string.

•The battery circuit breaker(s) of the power system can not be considered as the fault protection device for the battery string(s) and associated wiring.

•The interrupt rating of the battery circuit breaker(s) fitted within the power systems is 10kA. Therefore, the maximum potential short-circuit current of a 48V battery string must be

limited to less than 10kA or the total internal impedance of the battery string should be greater than 5.7mΩ.

If a smaller rated external fault protection device is used, then batteries with appropriate internal impedance need to be selected.

电池故障保护

•故障保护装置（例如：断路器或保险丝）必须串接在每组电池的一条电缆上。

•故障保护设备必须：

•尽量接近相应的电池组输出终端，并且

•能够断开电池组的潜在故障电流。

•不能把电源系统电池电路断路器认为是电池组和相关引线的故障保护装置。

•不能把电源系统电池断路器认为是电池组和相关引线的故障保护装置。电源系统内电池断路器的分断能力额定值是10 kA。因此，48V

电池组的最大潜在短路电流必须限制到小于10kA，或者，电池组的内阻必须大于5.7毫欧。

如果使用较低额定值的外部故障保护装置，则必须选择内阻合适的电池。

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	20	10640205 February 2009
		10640205 February 2009