接零的定义：接零是将电气系统中的中性点与地之间建立电气连接的过程。其目的是：确保电压的稳定并使电流能够流回电源并形成闭合回路，通过接零可以有效地减少电气设备和电路中的噪音、干扰和电压波动，并提供可靠的电源供应。
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