Paralleling Breaker A paralleling breaker is the circuit breaker that connects the generator set to the emergency bus, and across which all the individual generator synchronizing functions occur.
并联开关 并联开关是连接发电机组和应急母排的线路断路器，所有的单个发电机通过它完成同步运行。

Paralleling Control A paralleling control contains the electrical equipment provided in a paralleling system for control of a single generator set.
并联控制 并联控制是并联系统中用来控制单个发电机组的电气设备。

Phase Angle Phase angle refers to the relation between two sine waves which do not pass through zero at the same time. Considering one full cycle to be 360 degrees, the phase angle expresses how far apart the two waves are in relation to each other in degrees.
相角 相角指的是两个不同时经过零点的正弦波之间的关系。一个完整周期为360度，相角就是用度数来表示两个波的距离。

Phase Rotation Phase rotation (or phase sequence) describes the order (A-B-C, R-S-T, or U-V-W) of the phase voltages at the output terminals of a three-phase generator. The generator phase rotation must match the facility phase rotation. This must be checked prior to operation of the electrical loads in a facility with an on-site generator.
相序 相序表示的是三相发电机输出终端相电压的顺序。在用电负载运转之前必须检查确保发电机的相序与用电设施的相序一致。

Port The external connector on a device at which the network cable or medium is attached.
接口 设备的外接口，用于连接网络线或者其它介质。

Power Factor Power factor is the cosine of the angle between the active power (kW) and apparent power (kVA) in a circuit.
功率因数 功率因数是电路中有功功率(kW)和视在功率(kVA)之间夹角的余弦值。

Prime Power Prime Power describes an application where the generator set(s) must supply power on a continuous basis and for long periods of time between shutdowns. No utility service is present in typical prime power applications.
常载 常载是指发电机组可长时间和连续的运行。通常在没有市电供应，发电机组作为首要电源的场合使用。

Priority Control Priority control is the process by which the total loads on the bus is limited to the most critical loads in the system until adequate generation capacity is available to serve all loads.
优先级控制 优先级控制是指当总负载电力需求大于发电机组的输出时，首先要满足最关键负载的电力需求。

Protocol A set of rules used mutually by two or more devices to communicate. Also, known as the "language" used in a network.
协议 两个或多个设施共同遵守的一些通讯规则，在网络中常称为"语言"。