The voltage on bus bars of the main switchboard of the car carrier electrical power system at sea trials during a bow thruster start-up

The dataset is a part of the research results on the quality of supply voltage on bus bars of the main switchboard of the ship's electrical power system in different states of ship exploitation. In ships' electrical power systems, disturbances occurring in voltage waveforms on bus bars of the main switchboard are connected mainly with the processes of switching large loads on and off, such as switching on the bow thruster propulsion. The attached dataset contains the measurement results obtained onboard the car carrier during sea trials when a bow thruster start-up. The bow thruster propulsion motor with a power of 1300 kW consumed 3 kA during the start-up (nominal current 2.2 kA). The nominal power of a single generating set was 1400 kW, with a nominal current of 2.25 kA. For the studied case, the start-up was carried out in the parallel operation of two generating sets. Right before the start-up, the load of each generator set was 840 kW (60% of the nominal load of the ship's power plant at the time of commissioning). Immediately after the start-up, an emergency shutdown of less important receivers by the Mayer system was observed. At the same time, an additional generating set was launched because of overloading the ship's power plant. Despite this, there was no emergency shutdown, so-called black-out, of working generating sets. The voltage waveforms on bus bars of the main switchboard were recorder with the digital measuring system, which allows the simultaneous measurement of three phase-to-phase or two-phase voltages. The initial conditioning of the input signals is carried out by optoisolation amplifiers and a low-pass filter module (antialiasing). The formation of the output digital signal from the analog signal takes place in the a/d converter with a resolution of 16 bits and a sampling rate of up to 20 kS/s. The block diagram of the digital measuring system is shown in Figure. The files contain voltage waveforms of the output of a/d converters in [V], in three phases for the 440 V network. The attenuation and offset of the measuring path for the 440 V network are equal to 134.0123 [V / V] and -0.0175 V, respectively. The sampling frequency is inserted in the first row of the attached files. The files are described as follows: car_carrier_thruster_440_the number of the set. The block diagram of the digital measuring system

本数据集属于船舶电力系统（ship's electrical power system）主配电板（main switchboard）母线排（bus bars）供电电压质量在不同船舶运行工况下的研究成果。
在船舶电力系统中，主配电板母线排的电压波形扰动主要源于大容量负载的投切过程，例如艏侧推推进系统（bow thruster propulsion）的启停。本附随数据集收录了某汽车滚装船（car carrier）在海试（sea trials）阶段启动艏侧推推进系统时的船上实测结果。

该艏侧推推进电机额定功率为1300 kW，启动时的冲击电流达3 kA，额定电流为2.2 kA。单台发电机组（generating set）的额定功率为1400 kW，额定电流为2.25 kA。本次测试工况为两台发电机组并联运行（parallel operation）。启动前，每台发电机组的负载均为840 kW，占该船舶电站当时额定负载的60%。启动完成后即刻观测到梅耶尔（Mayer）系统对次要用电负载执行了紧急停机（emergency shutdown）操作；同时因船舶电站出现过载，启动了额外一台发电机组。尽管如此，运行中的发电机组并未发生所谓的全船失电（black-out）事故。

主配电板母线排的电压波形由一套数字测量系统（digital measuring system）采集，该系统可同时测量三相线电压（phase-to-phase voltages）或两相电压。输入信号的初始调理由光隔离放大器（optoisolation amplifiers）与低通滤波模块（low-pass filter module，抗混叠antialiasing）完成。模拟信号到数字信号的转换由分辨率为16位、最高采样率达20 kS/s的模数转换器（Analog-to-Digital Converter, ADC）实现。该数字测量系统的框图如图所示。

数据文件包含440V电网的三相模数转换器输出电压波形，单位为[V]。该440V电网测量通道的衰减系数（attenuation）与偏移量（offset）分别为134.0123 [V/V]与-0.0175 V。采样频率（sampling frequency）存储于附随数据文件的第一行。文件名格式如下：car_carrier_thruster_440_机组编号。数字测量系统的框图。