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Traditionally, high voltage (HV) laboratories have required different measuring instruments to measure alternating voltages 50/60 Hz (AC), using peak voltmeters, lightning impulses, through peak voltage meters or oscilloscopes and the apparent charge, by means of partial discharge (PD) measuring instruments. All of them with very different technical requirements stablished in applicable hardware and software standards (IEC 61083 series , IEC 60060 series [2, 3] and IEC 60270 ). However, the technological evolution of measuring instruments has allowed these measurements could be carried out through highperformance digital recorders. This article describes a new universal measuring instrument, developed by the LCOE for high voltage quantities, known as UMU (Universal Measuring Unit), for the five typical measurements to be carried out in any high voltage laboratory: AC 50/60 Hz, DC, Lightning impulse 1.2/50 μs (LI), Switching impulse 250/2500 μs (SI), partial discharge measurements, Radio Interference Voltage (RIV) measurements, transmitted overvoltage in secondary winding of voltage and current measuring transformers.A new software package has been also developed in the framework of 19NRM07 HV-com2 project .
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Two types of RTV coating were applied to the insulators, namely, RTV 1 and RTV 2 as shown in Fig 3. The differences of these two types of coating materials were depending on their formulations that determine their physical and electrical properties. These properties were depending on type of polymer, fillers and the amount of free fluid in the coating during its manufacturing process. The selection of these RTV coating were based on its electrical parameters and material properties. RTV type 1 was using high-grade nano-material while RTV type 2 was using normal material. Details properties of RTV coatings used are tabulated in Table 2. 2b1af7f3a8