Seismic Experimental Assessment of Remote Terminal Unit System with Friction Pendulum under Triaxial Shake Table Tests

In recent years, earthquakes have caused more damage to nonstructural components, such as mechanical and electrical equipment and piping systems, than to structural components. In particular, among the nonstructural components, the electrical cabinet is an essential piece of equipment used to maintain the functionality of critical facilities such as nuclear and non-nuclear power plants. Therefore, damage to the electrical cabinet associated with the safety of the facility can lead to severe accidents related to loss-of-life and property damage. Consequently, the electrical cabinet system must be protected against strong ground motion. This paper presents an exploratory study of dynamic characteristics of seismically isolated remote terminal unit (RTU) cabinet system subjected to tri-axial shaking table, and also the shaking table test of the non-seismically isolated cabinet system was conducted to compare the vibration characteristics with the cabinet system installed with friction pendulum isolator device. In addition, for the shaking table test, two recorded earthquakes obtained from Korea and artificial earthquakes based on the common application of building seismic-resistant design standards as an input ground motions were applied. The experimental assessment showed that the various damage modes such as door opening, the fall of the wire mold, and damage to door lock occurred in the RTU panel fixed on the concrete foundation by a set anchor, but the damage occurred only at the seismic isolator in the seismically isolated RTU panel system. Furthermore, it was considered that the application of the seismic isolator can effectively mitigate the impact and amplification of seismic force to the RTU panel system during and after strong ground motions in this study.

Modul Komunikasi Modbus RTU over RS485 Berbasis Arduino

Modul akuisisi data dengan menggunakan Modbus Remote Terminal Unit (RTU) telah banyak digunakan secara komersial di industri. Namun sayangnya, harga peralatan tersebut tergolong mahal. Protokol komunikasi Modbus RTU ini cukup kompleks untuk dibuat oleh pengguna awam, seperti siswa sekolah menengah vokasi dan mahasiswa. Dengan latar belakang tersebut, penelitian ini bertujuan untuk membuat modul komunikasi Modbus RTU over RS485 yang berbasiskan Arduino sehingga harga pembuatannya menjadi murah dan dapat menjadi sarana pembelajaran di sekolah menengah maupun universitas. Modul yang dibuat ini terdiri atas dua input analog dan dua input/output digital. Sinyal analog yang masuk dikondisikan terlebih dahulu dengan menggunakan signal conditioner sebelum diproses lebih lanjut oleh mikrokontroler. Hasil pengujian menggunakan Modbus Analyzer menunjukkan bahwa komunikasi Modbus RTU over RS485 pada modul yang telah dibuat ini berjalan dengan baik.

Development of Cyber-Physical Security Testbed Based on IEC 61850 Architecture

The paper focuses on security in industrial control systems. Numerous protocols and their incompatibility are undermining the security design. Also, the IEC 61850 standard focuses on these issues. In detail, it deals with the compatibility between protocols and, partly, security. In the context of this work, a testbed together with the traffic generator for IEC 61850 standard and its three main parts – MMS (Manufacturing Message Specification), GOOSE (Generic Object-Oriented Substation Events), and Sampled Values - are designed. Additionally, the used generator is compared with an example of RTU (Remote Terminal Unit) used in standard ICS (Industrial Control Systems) networks. The last part of this work consists of the performance testing of the implemented protocols (MMS, GOOSE, and Sampled Values).