E
Efficiency (EFF)
Efficiency is the ratio of energy output to energy input, such as the ratio between the electrical energy input to a motor and the mechanical energy output at the shaft of the motor.
效率
效率是输出能量与输入能量的比率，例如输入到电动机的电能与电机轴承输出的机械能的之间的比率。
Emergency System
An emergency system is independent power generation equipment that is legally required to feed equipment or systems whose failure may present a life safety hazard to persons or property.
应急系统
应急系统是指根据相关法规要求，为那些可能会危及生命安全或造成财产重大损失的设备或系统提供电源的独立发电设备。
Energy
Energy is manifest in forms such as electricity, heat, light and the capacity to do work. It is convertible from one form to another, such as in a generator set, which converts rotating mechanical energy into electrical energy. Typical units of energy are kW/h, Btu (British thermal unit), Hp/h, ft/lbf, joule and calorie.
能量
能量以电能、热能、光能等形式存在，可以做功，也可以从一种形式转换为另一种形式，例如发电机组能把机械能转变为电能。经常用的能量单位有：千瓦/小时、英国热量单位、马力/小时、焦耳、卡等。
 
F
Fault
A fault is any unintended flow of current outside its intended circuit path in an electrical system.
故障
故障是指在电力系统中任何电流跑出正常电路以外的情况。
Feeder Circuit Breaker
See Distribution Circuit Breaker.
馈电线路开关
见“配电线路开关”。
Fiber Optic Cable
A technology using glass or plastic threads (fibers) to transmit data. A fiber optic cable is a bundle of either glass or plastic threads capable of transmitting messages modulated into light waves. Typically, fiber optic cable has greater bandwidth allowing them to carry more data than metal wires. Fiber optic cable is lighter and less susceptible to interference than metal wires. Also, data can be transmitted digitally rather being transformed into analog data for transmission as is the case with metal wires when used for computer data transmission. Fiber optics are becoming increasingly more common for use with Local-Area Networks (LANs).
光缆
光缆是指使用玻璃或塑料束（光纤）来传输数据。光纤是一束可以用来传递被调制成光波的信息的玻璃或塑料管。与金属电线相比，光缆的特点是带宽更大，质量更轻，可以传导更多数据，抗干扰性能更好，并且数据是以数字形式而不是模拟形式传播。光缆在局域网领域的使用越来越普遍。
First Start Sensor
A first start sensor is an electronic device within some paralleling equipment that senses generator set and bus voltage and frequency, and determines whether or not a generator set is the first unit ready to close to the bus following a call to start under "black start" conditions.
首启动传感器
首启动传感器是应用于某些并联设备中的电子装置，功能是感知发电机组和母排的电压、频率，判断哪个机组在接到“黑启动”信号后第一个可以合到母排。
Frequency
Frequency is the number of complete cycles per unit of time of any periodically varying quantity, such as alternating voltage or current. It is usually expressed as (Hz) Hertz or CPS (cycles per second).
频率
频率是指周期性变化的事物（如交流电压和电流等）在单位时间内完成的周期数，常用单位是赫兹(Hz)或周期/秒(CPS)。
Frequency Adjust Potentiometer
A frequency adjust potentiometer is used to manually bring the frequency (speed) of the incoming set to that of the bus for synchronizing purposes. When the generator set is paralleled, operation of this potentiometer will adjust the kW load assumed by the generator set.
频率调整电位器
频率调整电位器是用于手动调整输入机组的频率使之与母排同步。当机组并联后，电位器可以调整为机组输出功率值。
Frequency Regulation
Frequency regulation is a measure that states the difference between no-load and full-load frequency as a percentage of full-load frequency.
频率调整率
频率调整率是指空载和满载之间频率的差别与满载频率的百分比。
 
G
Gateway
A device that acts as an interface between two different communication protocols. The Network Gateway Module (NGM) provides a communication protocol that a PC can understand. Other gateway devices may be used to interface between our Lontalk protocol and other systems such as a SCADA or Building Automation System. Typically, a gateway becomes necessary when a SCADA or BAS does not have a driver developed for Lontalk.
网关
网关是两个不同的通讯协议之间的接口，网关模块（NGM）提供了个人电脑可理解的通讯协议。其他网关设施可能被用作我们的Lontalk 协议和其他系统（如SCADA或楼宇自动化系统）之间的接口装置。当SCADA或楼宇自动化系统没有Lontalk的驱动时，网关就是必不可少的。
Generator
A generator is a machine which converts rotating mechanical energy into electrical energy.
发电机
发电机是把（旋转）机械能转化为电能的装置。
Genset Communication Module (GCM)
The GCM provides a communication gateway between the Model 3100 PowerCommand Control (PCCI) and the network. The GCM communicates with the PCCI control over a serial data link. The GCM gets data from the PCCI controls such as voltage, current, engine speed, oil temperature, etc. and then sends it out on the network if another network node is bound to it or requesting data.
机组通讯板
机组通讯板(GCM)是 PCC3100 控制器和网络之间的通讯接口。GCM与PCC通过串行数据连接。GCM从PCC得到如电压、电流、发动机转速、油温等，再把它们发送给需要这些信息的网络节点。
Governor
A governor is a device on the engine which controls fuel to maintain a constant engine speed under various load conditions. The governor must have provision for adjusting speed (generator frequency) and speed droop (no load to full load).
调速器
调速器是安装在发动机上的一个装置，在不同的负载条件下通过控制燃料量来保持发动机的恒定转速。调速器必须具备转速调整（发电机频率）和降速降调整（零负荷到满负荷）功能。
Grid
The utility-owned power distribution system.
电网
电网是指电厂的电力输送系统。
Ground
A ground is a connection, either intentional or accidental, between an electrical circuit and the earth or some conducting body serving in place of the earth.
接地
接地是电路与地渺幡巍怼啤笑桅痞兀地面上的导体的连接，可以是有意的也可以是意外的。
Ground Fault Protection
This function trips (opens) a circuit breaker or sounds an alarm in the event that there is an electrical fault between one or more of the phase conductors and ground (earth). This ground fault protection function may be incorporated into a circuit breaker.
接地故障保护
当一个或多个相导线与地之间出现电气故障时，接地故障保护通过跳脱断路器或报警来示警。这种功能可以一体化设计在断路器上。
H
Hertz (Hz)
The term Hertz is the preferred designation for cycles per second (CPS) and is used to describe frequency.
赫兹
赫兹是频率单位，也等于周期/秒(CPS)。
Hub
A common connection point for devices or nodes in a network or sub-network. Hubs are commonly used to connect segments of a LAN and contain multiple ports.
分支器
分支器是网络或子网络中设备和接点的集线器，包含很多端口，一般应用于连接局域网的分支。
Hunting
Hunting is a phenomenon that can occur upon load changes in which the frequency or the voltage continues to rise above and fall below the desired value without reaching a steady-state value. It is caused by insufficient damping.
游车
游车是一种在负载变化引起的频率、电压高于或低于期望值，无法达到稳定的现象。它是由于阻尼不足而造成的。