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CT (Current Transformer) ：
Current transformers are instrument transformers used in conjunction with ammeters, control circuits and protective relaying. They usually have 5 ampere secondaries.
电流互感器： 电流互感器是一种仪表变压器，通常与电流表、控制电路、保护继电器配套使用。
Circuit ：A circuit is a path for an electric current across a potential (voltage).
电路 ：电路是电流通过电势（电压）的路径。
Circuit Breaker ：A circuit breaker is a protective device that automatically interrupts the current flowing through it when that current exceeds a certain value for a specified period of time. See Air Circuit Breaker, Main Breaker, Molded Case Circuit Breaker and Power Circuit Breaker.
线路断路器 ：线路断路器是一个保护装置，当通过它的电流超过某个安全设定值一定时间后，它就能够自动切断电流。（见空气线路断路器、主开关、塑壳线路断路器等）。
Circulating Harmonic Currents
Circulating Harmonic Currents are currents that flow because of differences in voltage waveforms between paralleled power sources, or induced by operation of non-linear loads.
谐波环流
谐波环流是由并联电源间不同的电压波形或者非线性负荷运转而产生的电流。
Continuous Load
A continuous load is a load where the maximum current is expected to continue for three hours or more (as defined by the NEC for design calculations).
持续负荷
持续负荷是指使电流在3个小时或更长时间（根据NEC的定义）内需保持最大值的负荷。
Current
Current is the flow of electric charge. Its unit of measure is the ampere.
电流
电流是电荷的流动，以安培为单位。
Cycle
A cycle is one complete reversal of an alternating current or voltage from zero to a positive maximum to zero again and then from zero to a negative maximum to zero again. The number of cycles per second is the frequency.
周期
周期是指交流电流或电压从零到正最大值再到零，然后从零到负最大值再到零这样一个往复的过程；而频率则是指每秒可完成的周期数。
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
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
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
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
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
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，可以对各自系统操作控制。系统不同部分之间的通信状态和控制信息交流构成了分布式控制系统，这种系统内的通信是点对点方式，有别于所有的控制以及组成部分之间的通信都由一个中央控制器完成的系统。
Distribution Circuit Breaker
A distribution circuit breaker is a device used for overload and short current protection of loads connected to a main distribution device.
配电线路开关
配电线路开关是给连接在主配电设备上的负荷提供过载和短路保护的装置。
Droop Load Sharing
Droop load sharing is a method of making two or more parallel generator sets share a system kW load. This is accomplished by having each governor control adjusted so that the sets have the same droop (reduction of speed). Typical droop is two cycles in frequency from no load to full load.
转速降负荷分配
转速降负荷分配是两台或多台机组负荷分配的一种方法。这通过每台并联机组调速器具备相同的转速降。从空载到满载转速降一般为两赫兹。
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。
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。
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。
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。
Insulation
Insulation is non-conductive material used to prevent leakage of electric current from a conductor. There are several classes of insulation in use for generator construction, each recognized for a maximum continuous-duty temperature.
绝缘
绝缘体就是非导电材料，用来防止导体中电流的泄露。按最高持续耐热度划分，发电设备中使用的绝缘体有多种等级。
Lagging Power Factor
Lagging power factor in AC circuits (a power factor of less than 1.0) is caused by inductive loads, such as motors and transformers, which cause the current to lag behind the voltage. See Power Factor.
滞后功率因数
交流电路中的滞后功率因数（小于1.0）是由感应负荷引起的，例如发动机、变压器，使电流滞后于电压。（参照功率因数）
Leading Power Factor
Leading power factor in AC circuits (0.0 to -1.0) is caused by capacitive loads or overexcited synchronous motors which cause the current to lead the voltage. See Power Factor.
超前功率因数
交流电路中的超前功率因数(0.0 to -1.0)是由电容负荷或者过励的同步电动机引起的，使电流超前于电压。（参照功率因数）
Line-To-Line Voltage
Line-to-line voltage is the voltage between any two phases of an AC generator.
线电压
线电压是指交流发电机任何两相间的电压。
Line-To-Neutral Voltage
In a 3-phase, 4-wire, Y-connected generator, line-to-neutral voltage is the voltage between a phase and the common neutral where the three phases are tied together.
相电压
在三相四线星形连接的发电机中，相电压是指三相连接点与每相之间的电压。
Load Demand负载需求
Load Demand is a paralleling system operating mode in which the system monitors the total kW output of the generator sets, and controls the number of operating sets as a function of the total load on the system. The purpose of load demand controls is to reduce fuel consumption and limit problems caused by light load operation of reciprocating diesel generator sets.
负载需求是并联系统的一种运行模式，系统监控发电机组总的输出功率，根据系统总负载量决定运行机组的数量。负载需求控制的目的是降低燃料的消耗量，减少往复式柴油发电机组因低负荷造成的故障。
Load Factor
The load factor is the ratio of the average load to the generator set power rating.
负荷系数
负荷系数指的是机组的平均负荷与额定功率之间的比率。
Load Shedding
Load shedding is the process by which the total load on a paralleling system is reduced, on overload of the system bus, so that the most critical loads continue to be provided with reliable electrical service.
卸载
在超载的系统母排上，并联系统的总负载被降低的过程称为卸载，以确保最关键负载获得可靠的电力供应。
Local-Area Network (LAN)
A computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings.
局域网
局域网（LAN）是指覆盖相对较小区域的计算机网络，大多数局域网局限在单一的建筑或建筑群内。
Low Voltage
AC system operating voltages from 120 to 600 VAC.
低压
交流电系统中从120到600 VAC的电压称为低压。
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。
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。
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”。
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。
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。
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