The rapid growth of the photovoltaic industry necessitates development innovative solutions to ensure safe operation these systems. One most critical challenges in installations is ensuring protection against electric shock under both operational and emergency conditions, as well minimizing risk fire spread case an installation fire. Existing safety measures do not provide a sufficient level protection, particularly terms safety. To address shortcomings, comprehensive system has been...

The continuous monitoring of power system devices is an important step toward keeping such capital assets safe. Partial discharge (PD)-based measurement tools provide a reliable and accurate condition assessment insulations. It very common that voids or cavities exist in every solid dielectric insulation medium. In this article, different are modeled analyzed using advanced finite element (FE)-based computational algorithm. proposed approach can be used to measure PD regardless their shape...

This paper presents the space charge impact on inception and propagation of electrical trees in cross-linked polyethylene (XLPE) insulation via simulations experimentation. A 3D finite element analysis (FEA)-based modeling is proposed to simulate a needle embedded XLPE insulation. The FEA model demonstrates influence magnitude polarity initiation partial discharges (PD). Then critical parameters at tip an 8 µm. tree are be examined. Experimentation necessary verify simulation results...

Power transformers and gas-insulated switchgear (GIS) play crucial roles in electrical power grids. However, they may suffer from degradation of insulation material due to wear tear, leading their imminent failure. Partial discharges (PDs) are an initial sign materials which emit signals spanning various physical domains, including electromagnetic. PDs temporally narrow, high-frequency, stochastic radiation sources. The Ultra-Wideband Vivaldi Antenna is the key element for detection...

This paper is focusing on 3D Finite Elements Analysis (FEA) based modelling of protrusions as defects or imperfections in the XLPE high voltage cable.This study aiming to examine impact have initiation partial discharges.Spherical and ellipsoidal with different sizes at conductor screen cable an essential content this paper.In addition, a spherical gas-filled void placed inside outside protrusions, water tree produced from under consideration.The discharge influence taking place stress...

The objective of this study is to assess the impact low-frequency electromagnetic fields (LF EMFs) generated by power infrastructure on nearby environment. Measurements electric (E) and magnetic (H) field intensities were conducted around high-voltage lines, transformer stations facilities related them. Numerical simulations also performed model distribution values real buildings in close proximity delivery systems. Given ongoing scientific debate regarding effects EMFs living organisms,...

The paper presents the methods of assessing technical condition varistor surge arresters used in laboratory tests and operation—performed without disconnecting from network. analysis diagnostic was supplemented with results measurements leakage current coming directly their production power industry. Among available evaluating arresters, mainly indicator solutions (temperature operation counter) measurement selected parameters are used. In latter, method determining resistive component...

Problems of Varistor Quality Assessment During Exploitation Varistors are commonly used elements which protect power supply networks against high-voltage surges or lightning. Therefore, quality and endurance these is important to avoid losses when an expensive laboratory equipment would not be protected from random overvoltages. Additionally, excessive leakage currents generate serious costs due high energy consumption. The paper presents shortly properties varistors that comprized different...

The measurement of the metal - oxide surge arresters (MOSA) leakage current and analysis its components is a key diagnostic criterion according to technical standards. During on site MOSA condition assessment, easy way based only current, without inconvenient live working measurements supply voltage. Orthogonal vectors method determination resistive presented. This provides good estimate in comparison with references values from active power calculation.

The paper presents the methods of assessing technical condition varistor surge arresters used in laboratory tests and operation - performed without disconnecting from network. analysis diagnostic was supplemented with results measurements leakage current coming directly production power industry. Among available evaluating arresters, mainly indicator solutions (temperature, counter) using measurement selected parameters are used. In latter, method determining resistive component current,...

The paper analyses power quality requirements for isolated systems. Standards used within this framework are taken from widely classification societies rules, international standards applied to shore and off-shore units. norms can be also divided into merchant navy ships, both analyzed. themselves just a simple indication tool of the electric quality. Hence, four real time examples presented: 1) ship with regular propeller, 2) an all network exceeded 1 MVA, 3) passenger 6.6 kV 4) equipment...

Users expect reliable operation of the surge arrester during overvoltages, which may originate from a switching process or lightning discharge. The necessary conditions to guarantee these expectations are: appropriate construction arrester, its production being maintained in accordance with technical standards, and positive results type test. recipient, especially when purchasing large quantities product, can check final quality product through selective testing samples market order find...

Partial Discharges (PDs) are a common source of degradation in electrical assets. It is essential that the extent deterioration level insulating medium correctly identified, to optimize maintenance schedules and prevent abrupt power outages. Temporal PD signals received from damaged insulation, collected through IEC-60270 method gold standard for detection. may be transformed frequency domain, introducing new spectral features beneficial certain circumstances. Consequently, time delays...

This paper indicates a significant problem of uncertainty fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value this impedance, related to the short-circuit current disconnection time and reference value, is one most important elements that determines approval an electrical installation its receivers for operation. To define principles FLI measurement, several hundred measurements fed by...

This work investigates the impact of an applied AC and DC high voltage on electrical tree behavior in extruded cross-linked polyethylene (XLPE) insulation based simulation experimental validation. Extensive partial discharge (PD) testing methods are being implemented for cables under monitoring their condition. However, these PD cannot be utilized power voltages. voltages is considered this study because rising implementation HVDC worldwide. Therefore, it paramount importance to originating...