IEEE 13-Node Incident Energy Analysis Using Online Platform

The thermal hazard is considered the most significant hazard from an arc flash event. The protection against this type of hazard is associated with the assessment of incident energy, a study that aims to analyze the possibility of occurrence of an electric arc, the incident energy produced by it and the necessary protections so that the work in electricity is safe. An incident energy analysis is performed to the 634 bus of IEEE 13 Node system using the ATP Draw software to simulate a three-phase shot-circuit and an online platform that runs the IEEE Std 1584-2018 model is employed to obtain the incident energy levels and arc-flash boundary values for different durations of arcing event. As a closing, the personal protective equipment required for the different time scenarios are analyzed, according to the two approaches proposed in NFPA 70E-2021.

The Treasury Market Flash Event of February 25, 2021

The Treasury market flash event of February 25, 2021 underscores the pivotal role of high-speed liquidity provision in the most liquid electronic parts of the Treasury market. We find evidence that the sharp drop in prices that day was accompanied by a sudden drop in market depth and a brief deterioration in high-speed liquidity provision amid elevated transaction volumes, albeit to a much lesser extent than during the episode of severe illiquidity in March 2020. Similar to some previous episodes accompanied by moderately elevated economic and financial market uncertainty, market depth has recovered steadily since February 25 at a pace comparable to that observed following other such episodes, while high-speed liquidity provision appears to have rebounded fairly quickly. That said, market depth has taken over a month to partially recover, which suggests that Treasury market liquidity has been more heavily reliant on high-speed replenishment to meet trading demand and may remain fragile.

Analisis Variasi Ketebalan Coating Senyawa Glasir terhadap Daya Tahan Dielektrik Isolator Keramik Saluran Transmisi 150kV

ABSTRAKPenelitian ini bertujuan untuk mengetahui seberapa besar nilai coating isolator yang dapat ditembus listrik berdasarkan Basic Insulator Level (BIL). Metode yang digunakan dalam perhitungan tegangan tembus listrik ialah metode Anderson dalam hal ini Critical Fashover (CFO). Untuk mengetahui penurunan daya tahan dielektrik isolator dapat dilihat dari seberapa besar tegangan flashover yang dihasilkan. Hasil dari perhitungan disimulasikan dengan MATLAB logika fuzzy. Pada penelitian ini ketika isolator disetting pada coating 0,3 mm dengan waktu kejadian flash 2 μs maka tegangan flashover yang dihasilkan sebesar 1,3 MV. Hasil simulasi ini menunjukan bahwa pada coating 0,3 mm tegangan flashover yang dihasilkan melebihi dari BIL isolator yang sudah ditetapkan yakni sebesar 1,27 MV. Isolator dalam kondisi seperti ini dapat ditembus listrik atau daya tahan dielektriknya menurun. Secara bersamaan ketika kemampuan coating berkurang, maka dapat diklasifikasikan isolator dalam keadaan kotor.Kata kunci: isolator, coating, dielektrik, BIL, dan fashover ABSTRACTThis research aims to determine the value of the insulator that can be penetrated by electricity based on the Basic Insulator Level (BIL). The method used in the calculation of breakdown voltage is the Anderson method, in this case, Critical Flashover (CFO). To know a decrease in the dielectric resistance of the insulator can be seen from whatever the voltage resulting from a large flashover. The results of the calculations simulated with fuzzy logic Matlab. In this research, when the insulator set on a coating of 0.3 mm with a flash event time of 2 μs, then flashover voltage resulted in 1.3 MV. The simulation results show that at the coating 0.3 mm the result of flashover voltage exceeds the BIL insulator that has been set at 1.27 MV. Insulator in this condition can be penetrated by electricity or the dielectric resistance decreases. Simultaneously when the coating ability is reduced, then can be classified as a dirty insulator.Keyword: insulator, coating, dielectric, BIL, and flashover