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Article
Fault Detection and Protection System of Electric Railway Substation
Author(s)
Dae-Seok Kang1, Woo-Sik Won1, Byung-Lib Ahn1 and Byeong-Gon Lee2
Full-Text PDF XML 453 Views
DOI:10.17265/1934-8975/2022.04.001
Affiliation(s)
1. Entechworld, Inc., 196 Gasan Digital 1-ro, Geumcheon-gu, Seoul 08502, Korea
2. Korea Railroad Corporation, 240 Jungangno, Dong-gu, Daejeon 34618, Korea
ABSTRACT
The
industrial power systems are moving to digital networks, and unmanned systems
are increasing recently with the technological development of information and
communication technology. In particular, reliability of system operation is
very important for stable power supply. Most industrial power distribution
facilities use a 154 kV or 22.9 kV extra HV (high voltage) power system, and a
special monitoring system is required because a large loss occurs when an error
occurs in the power facility in the field. Although digital protection relay
(IED; intelligent
electronic device)
and FR (fault recorder) are applied to the field to protect the power system,
various improvement activities are still ongoing. In this paper, a 22.9 kV high-voltage panel
and its test bed, which are widely used in railway stations, tunnels,
substations and large plants, were tested as test subjects. The developed fault
detection system automatically starts the AL (auto-lock) circuit or outputs
an alarm signal to user by monitoring in real time problems such as CT (current transformer)-open
and poor-contact that the existing digital protection relay cannot cover. In
addition, it is intended to increase the safety and reliability of the power
system by blocking various accidents in the system in advance and accurately
analyzing the causes of faults with the developed fault detection system.
KEYWORDS
CT open, poor contact, fault detection, protection relay, substation, HV panel.
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