3WL电子脱扣器介绍解析.pptVIP

SENTRON 3WL电子过电流脱扣 SENTRON 3WL脱扣 – 选择标准 1. 哪个保护功能是需要的？ L 长延时过载保护 (a) S 短路短延时保护 (z) I 短路瞬时保护 (n) N 中性线保护 (N) G 接地保护 (g) SENTRON 3WL脱扣 – 选择标准 3. 希望什么样的显示 ? 不希望 4行液晶显示 大屏幕液晶显示 SENTRON 3WL 脱扣单元 SENTRON 3WL Trip Units (communication as an option) SENTRON 3WL接地保护模块改装 SENTRON 3WL 额定电流模块 什么是额定电流模块 ? 额定电流模块是用于断路器In可更换的插件 它能在设备启用过程中快速调整电流以匹配不同的负载和条件 这一功能类似于更换断路器电流互感器 额定插件: 部分运行负载的保护调整 额定插件: 部分运行负载的保护调整 额定插件: 部分运行负载的保护调整 SENTRON 3WL 额定插件 SENTRON 3WL带Rogowski-线圈的电流互感器 Current Measuring Rogowski Coil What is a Rogowski Coil?It is not actually a current transformer, but a current transducer.It utilizes an “air cooled” coil which is placed around a conductorto accurately measure current. It has been selected to replace traditional CT’s for the new 3WL because of it’s ability to provide superior protection. How does the Rogowski Coil provide superior protection?One of the most important benefits of the Rogowski Coil is in it’s linearity. The traditional CT design has a inherent saturation property, which causes the measurement at the high end of the spectrum to be out of calibration. The Rogowski Coil contains no saturable components. It is able to provide more accurate information to the trip unit, which in turn improves protection. Current Measuring Rogowski Coil How is it measured? The vout is equal to the dI/dt times the mutual inductance of the coil. This signal is then integrated electronically, so the voltage accurately represents the current waveform. Saturation of Iron Coils SENTRON 3WL带Rogowski-线圈的电流互感器 SENTRON 3WL种类 ETU15B SENTRON 3WL种类 ETU25B SENTRON 3WL种类 ETU27B SENTRON 3WL种类 ETU45B SENTRON 3WL种类 ETU45B SENTRON 3WL种类 ETU76B SENTRON 3WL种类 ETU76B SENTRON 3WLType ETU76B Voltage Transformer What is a voltage transformer?A voltage transformer (VT), also referred to as a potential transformer (PT), utilizes a high primary voltage winding which induces a lower voltage secondary winding at