D-F英语词汇发电机组专业术语.doc

D Dead Bus Dead Bus refers to the de-energized state of the power connections between outputs of paralleled generator sets. The term bus in this usage can either be rigid solid bus bars or insulated flexible cables. 不带电母排，是指连接并联发电机组输出之间的电力连接处于不带电状态。这里所指的母排可能是坚硬的实心汇流条，也可能是柔韧的绝缘电缆。 Delta Connection Delta connection refers to a three phase connection in which the start of each phase is connected to the end of the next phase, forming the triangle-shaped Greek letter Delta. The load lines are connected to the corners of the triangle. 三角形连接，是指在三相连接中，相临两相首尾相连，构成三角形的希腊字母Delta，负荷线连接在三角形的角上。 Differential Relay A differential relay is a protective device that is fed by current transformers located at two different series points in the electrical system. The differential relay compares the currents and picks up when there is a difference in the two, which signifies a fault in the zone of protection. These devices are typically used to protect windings in generators or transformers. 差动继电器。作为保护装置，差动继电器由位于系统中两个不同位置的电流互感器提供反馈信息。差动继电器对电流进行比较，如果存在不同则表示受保护区域内有故障存在。这些装置常被用于保护发电机或变压器的线圈。 Digital Master Control (DMC) This device is designed to control the power systems in a facility. It is offered as an option on Cummins switchgear. 数字主控制器，是用于控制设备电力系统的装置。在康明斯开关柜中数字主控制器是选配件。 Direct Current (DC) Direct current is current with no reversals in polarity. 直流，是指没有正负极性往复变化的电流。 Distributed Control System A collection of nodes that interact to control a system whose components are spread out over some distance. Each node has intelligence for operating its own particular component of the system. Different parts of the system communicate status and control information with one another to form a distributed control system. Typically, they communicate on a peer-to-peer level. This is different from a type of system where all control and interaction between components is dictated by one central control. This is a common master/slave arrangement. 分布式控制系统，是由分布在不同位置但互相作用的节点构成。每个节点具有智能，可以对各自系统