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Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

PM511V16 3BSE011181R1 processor module

Determination of 'MTR': Short the star-point to ground ( Rf = 0  ). Set the binary I/P 'AdjMTRInp'. On the HMI, open the menu 'Display function measurements' and note the value for 'MTR'. Return to the main 'Editor' menu, select the function 'Stator-EFP' in the submenu 'Present prot funcs' and enter and save the value noted for the setting 'MTR'. Remove the connection between the star-point and ground. Reset the binary I/P 'AdjMTRInp'. Determination of 'REs': Select the menus and items as for 'Determination of MTR'. Set the binary I/P 'AdjREsInp'. Enter the approximate value for REs. Simulate a ground fault Rf by connecting a resistor between the star-point and ground: 8 k < Rf < 12 k On the HMI, open the window 'Edit function settings': Enter the value for the setting 'RFs-Adjust'. Enter the approximate value for 'REs'. If the grounding resistor is on the secondary system side, the value entered must be referred to the primary side. (Refer also to the Sections concerning REs and MTR in the case of secondary injection at the star-point, respectively at the terminals.) Save the settings entered. Open the menu 'Display function measurements' and note the value of 'REs'. Enter and save the value noted for the setting of ‘REs’ in the ‘Edit function parameters’ sub-menu. Remove the simulated ground fault. Reset the binary I/P 'AdjREsInp'.

The protection function

Important note: The operation of the tripping and alarm triggers is disabled as long as one of the two binary I/P's 'AdjMTRInp' or 'AdjREsInp' is enabled, i.e. the protection will not trip, if the stator circuit is grounded. The two signals 'InterruptInt' and 'InterruptExt', on the other hand, are not disabled. REs and MTR in the case of primary injection at the generator star-point An injection transformer block Type REX 011 is needed for this circuit. Fig. 3.5.24.1 shows the wiring diagram for primary injection (peak value of Uis 110 or 96 V DC) at the generator star-point. The star-point is grounded via the resistor REs and the parallel resistor RPs. The current at the star-point must not exceed 20 A. It is recommended, however, to select the resistors such that the star-point current is  5 A to protect as much of the winding as possible. The v.t. must be designed such that for a solid ground fault at the generator terminals, the rated frequency component voltage signal Us = 100 ±20 %, i.e. the ratio MTR = N12/ N11 must lie within the following range: Design instructions: When supplied from a 110 V battery, the maximum power injected into the stator circuit is 110 VA. The injection unit is equipped with a converter to accommodate battery voltages between 48 V and 250 V. The peak injection voltage is ±96 V