AAC Alternating Current (AC) is electric current that alternates between a positive maximum value and a negative maximum value at a characteristic frequency, usually 50 or 60 cycles per second (Hertz).
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AC Alternating Current (AC) is electric current that alternates between a positive maximum value and a negative maximum value at a characteristic frequency, usually 50 or 60 cycles per second (Hertz).
交流 交流是指电流在正负最大值之间以特定的频率变动，通常频率为50或60赫兹。
ANSI American National Standards Institute.
美国国家标准协会 美国国家标准协会
Acoustic Material Acoustic material is any material considered in terms of its acoustic properties, especially its properties of absorbing or deadening sound.
声音材料 声音材料，特指有吸音或隔音特性的材料。
Active Power Active power is the real power (kW) supplied by the generator set to the electrical load. Active power creates a load on the generator set’s engine and is limited by the horsepower of the engine. Active power does the work of heating, turning motor shafts, etc.
有功功率 有功功率（kW），是指发电机组实际供应给负载的功率，它由发电机组的发动机提供，受到发动机马力大小的限制。发热和驱动马达转动靠有功功率完成。
Air Circuit Breaker An air circuit breaker automatically interrupts the current flowing through it when the current exceeds the trip rating of the breaker. Air is the medium of electrical insulation between electrically live parts and grounded (earthed) metal parts.
空气线路断路器 空气线路断路器的功能是当电流大小超过断路器的过流跳脱设定值后自动断开。空气是带电零件和接地金属零件之间的绝缘介质。
Alternator Alternator is another term for AC generator.
交流发电机 交流发电机
Amortisseur Windings The amortisseur windings of a synchronous AC generator are the conductors embedded in the pole faces of the rotor. They are connected together at both ends of the poles by end rings or end plates. Their function is to dampen waveform distortion during load changes.
阻尼线圈 同步交流发电机的阻尼线圈是指嵌绕在转子磁极间的导线，他们分别在两极用端环或端板相连接，主要功能是减弱因负载变化而引起的波形畸变。
Ampacity Ampacity is the safe current-carrying capacity of an electrical conductor in amperes as defined by code.
载流容量 载流容量是以安培数来定义导线安全载流能力。
Ampere The ampere is a unit of electric current flow. One ampere of current will flow when a potential of one volt is applied across a resistance of one ohm.
安培 安培是电流单位。1伏电压作用于1欧姆的电阻上就会产生1安培的电流。
Annunciator An annunciator is an accessory device used to give remote indication of the status of an operating component in a system. Annunciators are typically used in applications where the equipment monitored is not located in a portion of the facility that is normally attended. The NFPA has specific requirements for remote annunciators used in some applications, such as hospitals.
指示器 指示器作为一个附属装置常用于远程显示系统的各个组成部分的运行状态。指示器通常使用在监测设备不在设备现场的应用。美国国家防火协会对指示器在某些行业的应用有特殊要求，例如医院等。
Apparent Power Apparent power is the product of current and voltage, expressed as kVA. It is real power (kW) divided by the power factor (PF).
视在功率 视在功率是电流和电压共同作用的产物，用kVA表示。它等于有功功率（kW）除以功率因数。
Armature The armature of an AC generator is the assembly of windings and metal core laminations in which the output voltage is induced. It is the stationary part (stator) in a revolving-field generator.
电枢 交流发电机电枢的是金属芯和绕组的总成，产生感应电压。电枢是旋转磁场交流发电机的不动部分（定子）。
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NEMA National Electrical Manufacturers Association
国家电力制造协会 国家电力制造协会
NFPA National Fire Protection Association
国家防火协会 国家防火协会
Network A collection of Nodes that communicate with one another over a common medium.
网络 在共同的介质上互相通讯的接点的集合就是网络。
Network Data A signal that carries messages between nodes. PowerCommand Networks use Manchester Encoding that makes the signal insensitive to polarity. The signal is transformer-coupled to the network data wire at a rate of 78 KBPS.
网络数据 接点之间传送信息的信号就叫做网络数据。PowerCommand 网络利用Manchester编码使信号不受极性影响，信号通过变压器传送到网络数据线的速度是78 KBPS。
Network Gateway Module A device acting as an interface between a modem or PC and the network wire. The Gateway takes the UTP wire and then provides an RS-232 port for connection to either a modem or PC.
网关模块 网络模块是调制解调器或PC与网络线之间的接口。网关与UTP线相连，并为调制解调器或PC提供了RS-232连接端口。
Neutral Current Neutral current is the current that flows in the neutral leg of a paralleling system. Often, this term is used in reference to circulating currents or cross currents.
零线电流 零线电流指的是通过并联系统零线的电流，在谈及环流电流或者交叉电流时常会提到这个术语。
Node A module that can communicate over the network data to other modules. A module contains a Neuron Chip. Certain devices are nodes such as Genset Communication Modules (GCMs) and Control Communication Modules (CCMs). Other devices are not nodes, as they cannot communicate with other devices, but only receive messages. An example is the Network Annunciator Module (NAM).
接点 接点是含有神经元芯片的模块，可以通过网络数据与其他模块通讯。有些模块是接点，例如机组通讯模块(GCMs)和控制器通讯模块(CCMs)，而那些只能接受信息，而不能与其它设施实现通讯的模块则不是接点，例如网络示警模块(NAM)。
Nonlinear Load A nonlinear load is a load for which the relationship between voltage and current is not a linear function. Some common nonlinear loads are fluorescent lighting, SCR motor starters and UPS systems. Nonlinear loads cause abnormal conductor heating and voltage distortion.
非线性负载 电压和电流之间是非线性关系的负载称为非性形负载。一些常见的非线性负载有荧光灯、可控硅电动机启动器以及UPS系统。非线性负载能导致反常的导体发热和电压畸变。
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O
Ohm The ohm is a unit of electrical resistance. One volt will cause a current of one ampere to flow through a resistance of one ohm.
欧姆 欧姆是电阻单位。1伏特的电压通过1欧姆的电阻能产生1安培的电流。
One-Line Diagram A one-line diagram is a schematic diagram of a three-phase power distribution system which uses one line to show all three phases. It is understood when using this easy to read drawing that one line represents three.
单线图 单线图是用一条线来表示三相电力分布系统的示意。，
Overcrank Overcrank is an alarm function provided with most generator sets that indicate that the generator set has failed to start.
盘车失败 盘车失败是机组的预警功能，表示发电机组启动失败，大多数机组都有这种功能。
Overshoot Overshoot refers to the amount by which voltage or frequency exceeds the nominal value as the voltage regulator or governor responds to changes in load
超调 超调是指电压调节器或控制器响应负载的变化时，导致电压或频率超出正常值的那部分。
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P
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。
Peak Load Peak load is the highest point in the kilowatt demand curve of a facility. This is used as the basis for the utility company’s demand charge.
峰值功率 峰值功率是用电设备的功率需求曲线中的最大值。
Peer-To-Peer A network operating system where any device on the main network bus can initiate communication.
点对点 点对点是一种网络运行系统，任何设施都可以发起信息交换。
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”。
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R
Radio Interference Radio interference refers to the interference with radio reception caused by a generator set.
无线电干扰 无线电干扰是指发电机组对无线电信号接收造成的干扰。
Reactive Power Reactive power is power that flows back and forth between the inductive windings of the generator and the inductive windings of motors, transformers, etc., which are part of the electrical load. This power does no useful work in the electrical load nor does it present load to the engine. It does apply load to the generator and limits the capacity of the generator.
无功功率 无功功率是指电流在发电机、电动机、变压器等的感应线圈之间往复流动，这也构成了电力负载的一部分。它并没做有用功，而且也不是发动机的负载，但是作为发电机负载，限制了发电机的容量。
Reverse Power Relay A reverse power relay is a relay with a wattmeter movement that senses the direction of power flow. In paralleled sets, a flow of reverse power (i.e., power flow into set) will actuate the reverse power relay and disconnect the set from the system. If one set stops and reverse power protection is not provided, the set still running will drive the set that has stopped. The generator on the set that has stopped will act as a motor.
逆功率继电器 逆功率继电器是指带瓦特计的继电器，用来感知电流的方向。在并联机组中，反方向电流（例如流回发电机组的电流）会启动逆功率继电器，把该机组与系统断开。如果一台发电机组没有运转，并且没有逆功率继电器保护，运转的机组就会驱动这个机组，这台机组上的发电机则变成电动机运行。
Router A device for passing network messages over another media and sometimes protocol. Our network router is programmed as a "repeater" to create another channel on the main network bus. Each channel can have a 4,600 ft. network bus and is capable of having 44 nodes. The PowerCommand Network can have up to twenty (20) channels.
路由器 路由器是把网络信息通过另外一种介质（有时是协议）传送出去的装置。我们的网络路由器被设定为“转发器”，在主网络上创建另外一个信道。每个信道有4,600 ft网络母排，可容纳44个接点。 PowerCommand 网络最多可有20个信道。
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S
SCR Silicon Controlled Rectifier -- a three-electrode solid-state device which permits current to flow in one direction only, and does this only when a suitable potential is applied to the third electrode, called the gate.
可控硅整流器 可控硅整流器——三电极固态元件，只有当匹配的电压作用于第三电极（选通电极）时，才能够保证电流朝一个方向流动。
Short Circuit A short circuit is generally an unintended electrical connection between current carrying parts.
短路 短路通常是指带电流的组件之间意外的电路连接。
Shunt Trip Shunt trip is a feature added to a circuit breaker or fusible switch to permit the remote opening of the breaker or switch by an electrical signal.
分励脱扣 分励脱扣是线路断路器或可熔电闸的一个特性，可通过远程信号来进行分断或转换。
Soft Loading Soft loading refers to the ramping of load onto or off of a generator in a gradual fashion for the purpose of minimizing voltage and frequency transients on the system.
软加载 软加载是指在给发电机组增加或减少负载时要逐渐进行，以减少电压和频率对系统的瞬变影响。
Sound Level Meter A sound level meter measures sound pressure level. It has several frequency-weighted decibel (dB) scales (A, B, C) to cover different portions of the range of measured loudness. Sound level meters indicate RMS sound, unless the measurements are qualified as instantaneous or peak sound level.
声级表 声级表是用来测量声压级别的，它根据声音的频率分为几个分贝级（A, B, C）。声级表表征的是均方根声音，除非是适合瞬间或峰值的度量。
Sound Pressure Level (SPL) Sound pressure level is a measurement of the pressure fluctuations of a sound wave as it propagates through the air. Because of the wide range of pressures to which the ear responds, a logarithmic scale is used and is expressed as a ratio of the measured pressure referenced to a pressure of 2x10-5 N/m2 (20 m Pa) which is the threshold of human hearing at 1000 Hz. The measure is expressed in decibels (dB). The Bel unit is named after Alexander Graham Bell.
声压级别 声压级别是表示在空气中传播的声波的起伏压。由于耳朵能感知的声压范围很大，所以采用其对数值，并以2x10-5 N/m2 (20 m Pa)的比率表示，这是人类在1000 Hz所能听到的极限，单位是分贝(dB)。贝尔（十分贝）是以亚历山大·格雷姆·贝尔的名字命名的。
Standby System A standby system is an independent power system that allows operation of a facility in the event of normal power failure.
备用系统 备用系统是一个独立的电力供应系统，当常规电力供应失败时，备用系统就会运行。
Star Connection See Wye Connection.
星形连接 参见Y形连接。
Starting Current The initial value of current drawn by a motor when it is started from standstill.
启动电流 当发动机从停止状态启动时带来的初始电流值就是启动电流。
Surge Surge is the sudden rise in voltage in a system, usually caused by load disconnect.
突变 突变是指系统中电压突然升高，通常是由于负载断开而引起的。
Surge Suppressor Surge suppressors are devices capable of conducting high transient voltages. They are used for protecting other devices that could be destroyed by the transient voltages.
突变抑制器 突变抑制器是能够抑制瞬间高电压的设施，用来保护其他设备免受瞬间电压的破坏。
Sync Check Relay A sync check relay is an electrical device that monitors the phase relationship between two voltage sources and provides a signal when the voltage sources are within specific preset parameters.
同步检查继电器 同步检查继电器是监测两个电压源之间的相位关系的电气设备，如果电压源间的关系在预定的参数范围内，它就会发出相应信号。
Synchronizer A synchronizer is an electronic device that monitors the phase relationship between two voltage sources and provides a connection signal to an engine governor, to force the generator set to synchronize to the system bus.
同步器 同步器是用来监测两个电压源之间的相位关系的电子设备，它向发动机调速器发出信号，以促使发电机组与系统母排能够同
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T
Terminator A resistive load placed at the end of a cable to prevent data signals from reflecting back into the data path.
终结器 终结器就是置于电缆终端的一个电阻负荷，用来防止数据信号又反射回到线路中去。
Transfer Switch A transfer switch is an electrical device for switching loads between alternate power sources. An automatic transfer switch monitors the condition of the sources and connects the load to the alternate source if the preferred source fails.
转换开关 转换开关是能够把负载在备用电源和常规电源之间进行转换的电气设施。自动转换开关能够进行监控，如果首选电源供应失败，就自动把负载连接到备用电源。
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U
Undershoot Undershoot refers to the amount by which voltage or frequency drops below the nominal value as the voltage regulator or governor responds to changes in load.
下超调 下超调指电压调整器或控制器在应对负荷变化时，电压或频率低于额定的量。
Utility The utility is a commercial power source that supplies electrical power to specific facilities from a large central power plant.
市电 市电是商业电源，从大型中央电站向各设施供电。
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V
Voltage Control The voltage control is a rheostat that sets the operating point of the voltage regulator and therefore controls the output voltage of the generator set, within its design limits.
电压控制 电压控制是设定电压调整器的运行点从而在设计范围内控制发电机组的输出电压的变阻器。
Voltage Dip Voltage dip is the dip in voltage that results when a load is added, occurring before the regulator can correct it, or resulting from the functioning of the voltage regulator to unload an overloaded engine-generator.
电压暂降 电压暂降是在负荷增加而调整器还未能进行校正时、或电压调整器正在为过载的发动机卸载时出现的电压下降。
Voltage Regulation Voltage regulation is a measure that states the difference between maximum and minimum steady-state voltage as a percentage of nominal voltage.
电压调整率 电压调整率描述的是最大和最小稳态电压差与额定电压之间的百分比
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W
Watt-Hour Meter A watt-hour meter records the total power output at a specific point in a system. Typical recording increment is in kW-hours.
电度表 电度表记录系统中某一点的总电力输出，通常以千瓦时为记录单位。
Wye Connections A Wye connection is the same as a star connection. It is a method of interconnecting the phases of a three-phase system to form a configuration resembling the letter Y. A fourth (neutral) wire can be connected at the center point.
Y连接 Y连接就是星形连接，也就是把三相系统中的相按照字母Y的形状连接起来，还可以在中心点接上第四根（中性）线。
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Z
Zero Sequence Zero sequence is a method of ground fault detection that utilizes a sensor (CT) that encircles all the phase conductors as well as the neutral conductors. The sensor will produce an output proportional to the imbalance of ground fault current in the circuit. This output is then measured by a relay to initiate circuit breaker tripping or ground fault alarm.
零序 零序是一种接地故障检测方法，它使用一个传感器（CT）来把所有相导体和中性导体连接在一起，传感器会按照线路中接地故障电流的不平衡程度等比例地产生输出，再由一台继电器来测量这一输出，并断开断路器或释放接地故障警报。
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