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。

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。