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AC three-phase energy network analyzer
UMG 505 Janitza Electronics

The UMG 505 is a digital integral measurement instrument which is suitable for measuring and recording electrical parameters (True-RMS) in low and medium voltage networks. The measurement device is suitable for 1- and 3-phase systems with and without neutral conductors. At a mains frequency of 50 Hz, the scanning frequency of random measurements, which takes place twice per second, is 6.4 kHz. It is characterised by the high accuracy level, the compact construction and the measurement of harmonics in each external conductor.

In order to achieve functional variety of the UMG 505, you would need around 13 analogue units such as an ampere meter, volt meter, volt meter switch, power meter (kW, kVA, kvar, cos ϕ), an effective and reactive energy meter (kWh/kvarh), a clock, a frequency meter and a harmonic analyser. This means that the planning, installation, wiring and storage costs are significantly reduced with the UMG 505 in comparison to analogue measuring instruments. Another advantage is the more accurate and better legibility. Selected measurement values and power failure/power return are recorded in a ring buffer with stamp time.

Functional principle

The three phase electronic measurement system measures and digitizes the effective values of voltage and currents in a 50 / 60Hz network. Two random tests per second are carried out. From these scanned values, the inserted microprocessor calculates the electrical quantities.

Peak values, lowest values and programmed data are saved in a battery buffered memory. Selected values as well as net breakdown and return are saved with date and time within the ring buffer.