基于平衡桥-不平衡桥直流电源绝缘检测的策略

摘要：绝缘性能直接关系到直流电源系统的安全运行，传统直流绝缘检测的方法存在检测死区、抗干扰能力差和母线电压波动过大的缺点。因此，文中提出了基于“平衡桥-不平衡桥”直流电源绝缘检测的策略，通过不平衡桥电阻取值，有效降低了直流母线电压波动。并根据所提的策略设计了一种基于“主机-从机”模式的大型直流绝缘检测系统。实际应用表明，基于该绝缘检测策略的直流电源系统运行可靠、精度高、无检测死区、实时性好。

Strategy of DC Power Supply Insulation Detection Based on Balanced Bridge-Unbalanced Bridge

Insulation performance is directly related to safe running of DC power systems. Since the traditional DC insulation detection method has the shortcomings such as detection dead zone, poor anti-jamming performance and excessive fluctuation of the busbar voltage, an in- sulation detection method based on ＂balanced bridge-unbalanced bridge＂ is proposed in this paper. Voltage fluctuation is reduced effectively by choosing suitable unbalanced-bridge re- sistance. A large DC insulation detection system is then designed based on the ＂master-slaver＂ mode with the proposed detection strategy. The practical application demonstrates that the DC system under the strategy is reliable and high accurate with good real-time ability and no dead zone.