The voltage on bus bars of the main switchboard of the ro-ro ship electrical power system during a sea voyage - Open Research Data - Bridge of Knowledge

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The voltage on bus bars of the main switchboard of the ro-ro ship electrical power system during a sea voyage

Description

The dataset is 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. The attached dataset contains the measurement results carried out onboard a ro-ro ship during a sea voyage.

The ro-ro ship is equipped in three-phase, three-wire electrical power systems. The ship's electrical power plant consists of two free-standing generators 1000 kVA each and two-shaft generator 1500 kVA each (see Figure 1). The nominal voltage on bus bars of the main switchboard was 400 V with a frequency equal to 50 Hz. The voltage of 220V has been obtained by means of a transformer. The single shaft generator has been used during sea voyage as well as during maneuvering as an energy source of a bow thruster. The each of shaft generators could not work in parallel with other electrical energy sources, excluding short switching time (roughly 2 seconds). The shaft generators have been connected with the remaining system only with the help of a simple circuit breaker. It has been possible thanks to adjusting screw propellers using.

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. Using three channels at the same time allows the maximum sampling rate of 6.6 kS/s. The block diagram of the digital measuring system is shown in Figure 2.

The files contain voltage waveforms of the output of a/d converters in [V], in three phases for 400 V network. The attenuation and offset of the measuring path 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 data recorded during a sea voltage is included in the file named ro_ro_voyage.TXT.
The file described as ro_ro_transition.TXT contains measurement data, which was recorded during the generator G1 operation, after 2 s the shaft generator SG1 is switching off and after 20 minutes the generator G2 is on.

Illustration of the publication

Figure 1. The electrical power plant configuration on the ro-ro ship

Illustration of the publication

Figure 2. The block diagram of the digital measuring system

Dataset file

ro_ro_sea_voyage.zip
251.1 MB, S3 ETag c2983b856c113bd932a5f97dda4afb81-1, downloads: 16
The file hash is calculated from the formula
hexmd5(md5(part1)+md5(part2)+...)-{parts_count} where a single part of the file is 512 MB in size.

Example script for calculation:
https://github.com/antespi/s3md5
download file ro_ro_sea_voyage.zip

File details

License:
Creative Commons: by 4.0 open in new tab
CC BY
Attribution
Raw data:
Data contained in dataset was not processed.

Details

Year of publication:
2020
Verification date:
2020-12-17
Creation date:
1999
Dataset language:
English
Fields of science:
  • Automation, electronic and electrical engineering (Engineering and Technology)
DOI:
DOI ID 10.34808/8t7j-2r77 open in new tab
Verified by:
Gdańsk University of Technology

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