Power Quality Monitoring

▼Chapter 2Universal measuring instrumentsUMG 96L/UMG 96universal measuring instruments96 x 96mm front panel mountingThe use of energy measurement technology in energy distributionhas moved dynamically towards digital universal measuring instrumentsin the past few years. The advantages are obvious: lowerequipment costs for more information and functionality. In addition,digital measuring technology is more accurate, even all along theentire lifespan.Clear cost advantages also result from the construction of theswitchgear which results in lower installation costs and less wiringefforts in comparison to analogue measuring technology. Universalmeasuring instruments of the UMG 96L and UMG 96 productfamilies are mainly designed for use in low and medium voltagedistribution systems.In addition to the large quantity of electrical measurement values,this series also offers a number of additional functions such as therecording of minimum and maximum values, the operating hourmeter, the bi-metallic strip function, password protection andmany more.▼Main featuresCompact housing dimensions (96x96 mm), minimal installation depthUser-friendly and reliable terminalsLarge LCD with outstanding legibilityThe large quantity of electrical measurement values, replaces 13 analogue measurement units and moreExcellent reliability and long life spanApplicationsThe UMG 96L and UMG 96 measurement instruments are digitalfront panel mounted measuring instruments which are suitablefor measuring and recording electrical parameters (True-RMS) in50/60 Hz networks. The measurement is configured for threephasesystems with a neutral conductor (TN and TT networks).At the network frequency of 50 Hz or 60 Hz, the scanning frequencyof the random measurements which take place once persecond is 2.5 kHz or 3.0 kHz. The supply voltage and scanningfrequency for operating the UMG 96L is taken from the L1-Nmeasurement voltage. The effective values and the minimum andmaximum values are recorded every 15 minutes and the programmingdata is immediately stored in a non-volatile memory(EEPROM). The main characteristic of the measurement instrumentis the compact construction (96x96 mm) and the high levelof stability.In order to achieve the functional diversity of the universal measurementinstrument, you would need 13 analogue units such asan ampere meter, volt meter, volt meter switch, power meter(kW, kVA, kvar, cos ϕ), an effective and reactive energy meter(kWh/kvarh) and a frequency meter. This means that the planning,installation, wiring and storage costs are significantly re -duced in comparison to the use of analogue measuring instruments.Another advantage is the higher precision and better legibility.39