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PVS 100

The system consists of two identical devices, one of which is used as a base station and is connected to a known reference phase. The second device (the mobile unit) can be connected anywhere in the network. The phasing can be determined across various voltage levels by comparing the angle of the phase currently being tested with that of the reference phase. Automatic comparison with a direct indication of the phase assignment takes place by synchronizing the two devices via a mobile connection, using GPS as a highly accurate time base. If there are one or more transformers between the base station and the test point, the effect of the vector groups and the associated phase shifts (multiples of 30°) can be easily taken into account by entering appropriate correction values. Special operating modes allow the system to be used even when there is no GPS or cellular connection. To do this, the mobile unit can either be synchronized before the test to an available low voltage supply that remains connected, or the recorded test readings are synchronized via an existing mobile connection after the test. The PVS 100 can be used anywhere thanks to its built-in rechargeable battery. The system is directly connected to the test object at network voltages up to 400 V. At higher voltages, up to 120 kV, the test is performed using a high voltage sensor which communicates with the PVS 100 via bidirectional wireless communication. The test status and the phase indication are signaled using a visual display on the sensor.