Power Quality Interface for Medium and High Voltage Networks Type PQI-D - a. eberle - #1

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................ Version 10/2010 The state-of-the-art PQI-D power quality interface for medium and high voltage networks is the central component of a system for carrying out all of the required measurement tasks in electrical networks. PQI-D can be used both as a power quality interface according to DIN EN 50160 and as a measuring device for all physically defined measurement quantities in three-phase networks. The component is primarily designed to monitor special reference qualities and quality agreements between the energy supplier and the customer, as well as to monitor, record, evaluate and store the data. Modern voltage quality measuring devices operate according to the IEC 61000-4-30 standard. This standard defines measuring methods and so provides the user with a basis for comparison. Devices from different manufacturers which function in accordance with this standard must provide the same measurement results. The standard defines two different measuring devices classes. Class A measuring devices are used primarily for measurements related to contracts in the customer/supplier relationship, while Class B measuring devices can be used for determining statistical quality values. PQI-D complies with the requirements of IEC 610004-30 for Class A devices for the following parameters. Power quality interface for low, medium and high voltage networks Type PQI-D * in wall mounting housing * in panel mounting housing * as a 19" plug-in module Parameters Class Accuracy of voltage measurement......................... A Determination of time intervals............................... A Marking of measurement values for events............. A Harmonics, interharmonics.................................... A Frequency.............................................................. A Voltage asymmetry................................................. A Event recording...................................................... A Synchronization...........................A (with DCF77 or GPS) In addition, three different fault value recorders can be used. The oscilloscope recorder stores fault records which are composed of 100 ìs-sampling values of freely selectable length (pre-event and post-event history) The r.m.s. recorder stores fault records which are composed of the r.m.s. values of half period values (10 ms). The length of the fault record (pre-event and post-event history) is also freely selectable. The harmonics recorder stores the corresponding spectrum of all harmonics from the 2nd to the 50th if a limit value (harmonic or THD of a voltage) is exceeded. All fault records are triggered by a freely definable event. This enables phase-phase and phase-earth events to be recorded simultaneously. Limit value violations can also be signalled via LEDs or relays if required. The inputs and outputs of the interface can be supplied in various hardware versions; its later use is prescribed by the configuration of the input current transformer and the voltage transformer. • • • • • • • • Application GB A. Eberle GmbH & Co. KG Technical data