为保证配变的安全运行，应采取有效措施抑制零序电流的产生。因中性线不平衡电流是零序电流的3倍，因此，中性线电流的限制值经过理论计算可以证明：联结组为Y，ynO的变压器，其中性线电流不得超过额定电流的25%。这就是抑制零序电流的中性线电流的限制值。
In order to ensure the safe operation of distribution transformer, effective measures should be taken to suppress the generation of zero sequence current. Because the unbalanced current of the neutral line is three times that of the zero sequence current, the theoretical calculation of the limit value of the neutral line current can prove that the neutral line current of the transformer with Y and ynO connection group can not exceed 25% of the rated current. This is the limit value of neutral line current to suppress zero sequence current.
在配变以三相四线制供电运行中，为抑制零序电流的产生，必须经常检测中性线的电流值，如检测到中性线电流达到或超过额定电流的25%时，这将预示着零序电流的产生。为此，应采取措施对配电网的i相用电负荷进行调整，使三相负荷尽量趋于平衡，以减少中性线电流，抑制零序电流的产生。
In the operation of three-phase four-wire power supply system for distribution transformer, in order to suppress the generation of zero-sequence current, it is necessary to constantly detect the current value of neutral line. If the current of neutral line reaches or exceeds 25% of the rated current, this will indicate the generation of zero-sequence current. Therefore, measures should be taken to adjust the phase I load of distribution network so as to balance the three-phase load as far as possible so as to reduce the neutral line current and restrain the generation of zero-sequence current.
对于以三相网线制供电的配电变压器，在供用电管理中，首要的工作即是经常检测调整三相负荷，使三相负荷尽量保持基本平衡，保证变压器处于i相负荷平衡的状态运行这不仅可抑制零序电流的产生，而且，也是配变安全、经济运行的有效措施。
In the management of power supply and consumption, the primary task is to detect and adjust the three-phase load regularly so as to keep the three-phase load as balanced as possible and ensure that the transformer operates in the state of phase I load balance, which can not only restrain the generation of zero-sequence current, but also ensure the safety and economy of distribution transformer. Effective measures for economic operation.