产品详细资料
阻抗接地Y形绕组上的内部接地故障(见上图第二)产生的故障电流(IF)取决于接地阻抗的值和绕组上故障相对于中性点的位置。由于故障电压不是系统电压,而是初级绕组之间的变压比和次级绕组上短路匝数百分比的结果,因此对于绕组较低30%的故障,产生的初级电流(I/P)可以忽略不计。因此,产生的差分电流可能低于差分元件百分比的斜率阈值,因此故障可能未被检测到。下图显示了一次电流(IP)和故障电流(IF)之间的关系,作为故障点与中性点距离的函数,图5-25:RGF和差动保护区百分比概述了阻抗接地Y型的绕组有效保护区。
An internal ground fault on an impedance grounded wye winding (see second figure above) produces a fault current (I F) dependent on the value of the ground impedance and the position of the fault on the winding with respect to the neutral point. The resultant primary current (I P) will be negligible for faults on the lower 30% of the winding since the fault voltage will not be the system voltage but the result of the transformation ratio between the primary windings and the percentage of shorted turns on the secondary. Therefore, the resultant differential currents could be below the slope threshold of the percent differential element and thus the fault could go undetected. The graph below shows the relationship between the primary (I P) and fault (I F) currents as a function of the distance of the fault point from the neutral and FIGURE 5–25: RGF and percent differential zones of protection outlines the zones of effective protection along the winding for an impedance grounded wye.
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●使用前:
在操作和维护,安装设备之前,请阅读并严格遵守安全相关的信息。
Read and strictly follow safety-related information before operatingmaintainingand installing equipment.
●使用者要求:
必须从事安装,组装或维护设备等相关工控电气机械以及其他相关技术的人员。
Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.应用范围:
应用于品牌本系列工业以及生产生活自动化设备产品。
Used in the brand of this series of industriaand production automation eauipment products
适用于场景:系统集成,非标定制,产线升级改造,原设备电气替换等等。
Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.
●操作人员:
应该由本品牌专业培训操作员来安装、操作和维修设备。专业人员具有技术能力强,熟悉安全信息和安全实施:
熟悉设备的安装加工、操作和维护:熟悉处理所有的潜在危险情况。
Equipment should be installed,operated and maintained by trained operators from the brand
●危险情况
警告
.请注意使用人员的人身安全。
●除了产品特性以及功能,还需了解产品的使用寿命环境。
●充分学习产品使用手册,否则非专业人员可能会造成人身危险。
Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.
●服务行业
适用水泥,木业,石业,橡胶,石油,化工,发电,环保,水处理,制冷,交通,钢铁,食品,饮料,船舶,制冷等行业
Applicable to cementwood,stone,rubber,petroleumchemical, power generation