W o r l d C l a s s P o w e r S o l u t i o n s TEBEVERT Switch-mode inverters

All monitoring and control units are designed to be intrinsically safe so that an uninterrupted supply of the connected load is ensured. These products have a very good dynamic range. At load peaks of 0 % – 100 % – 0 %, fluctuations and voltage surges are corrected within a very short time. In order to increase the availability of the system a mechanical by-pass can be provided. In case of inverter failure the system can be manually switched to mains supply (Fig. 2). The EUE (electronic bypass) is another component for increasing the system security. Using of the EUE loads are directly switched...

Typeseries Tebevert III Technical data: 1000 VA, 1500 VA, 2500 VA, 5000 VA, Type Type table Inverter with integrated mechanical by-pass Input DC voltage: see type table Permissible deviation: + 20 %, - 15 % Disconnection value: 1,7 V/C +/- 1V 2,4 V/C +/- 1 V Connection value: 2,05 to 2,1 V/C Ripple of the input voltage: max. 5 % rms. (2 mV reverse smoothing for 48 V and 60 V) Nominal power: see type table Output voltage: 230 V Efficiency: approx. 85 % Static deviation: +/- 5 % at total loading -, nominal voltage - and power factor range Frequency: 50 Hz Constance of frequency: +/- 0,1 % (at self-step)...

Parallel operation of inverters Mechanical by-pass SUE Static bypass EUE Fig 6: Inverter with SUE Conventional inverter systems operate with a “passive redundancy” i.e. the mains does not supply the loads directly but will be connected in a fault situation. In contrast to this, parallel operating inverters, that are actively supplying the load (N or N+1 operation) offer an “active redundancy”. This operation mode requires a reliable exchange of information by the inverters via control signals. Furthermore a faulty unit has to be identified and switched off before the common busbar is affected....

The control of parallel connected inverters ensures a uniform power distribution among the modules. The currents and bus voltage load of 1,11 kW is shown in fig. 7. Both are actively supplying the load. On failure of inverter A inverter B takes the full current load without a interference of the voltage. (Fig. 8). After fault clearance the inverter is connected parallel again. In Fig. 9 (see unit A) bringing the current on the inverter can be critical. The bus voltage is not affected. The Tebevert III inverter range can supply linear and non-linear loads. Fig. 10 shows currents at combinational...

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