选型常识
发电机组专业术语中英文对照大全（O、P、R、S、T）
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
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。
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”。
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。
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步。
Synchronous Generator
A synchronous generator is an AC generator having a DC exciter. Synchronous generators are used as stand-alone generators for emergency power and can also be paralleled with other synchronous generators and the utility system.
同步发电机
同步发动机是配有直流励磁机的同步交流发电机。同步发动机能作为独立的紧急电源，也可以与其他同步发电机或市电并联。
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。