DISCHARGE DEVICES Resistor Modules Capacitors with CAPAGRIP K and CAPAGRIP II terminals are equipped with discharge resistors for a discharge from their highest nominal voltage rating to less than 50 V within < 60 seconds. For capacitors with CAPAGRIP L, and M, as well as with D terminals we offer separate resistor modules. The cor- rect size of the module to be applied can be selected from the data charts on pages 49f based on applied voltage, required discharge period, and capacitance to be discharged. Alternatively, the resistors to be used for a given capaci- tance and operating voltage can be calculated by means of the following formula: t t h r e e -ph a s e : R U 2 B R R k C ln T C C U E t 1.5 s i ng l e -ph a s e : R k = 1 k = 3 U 2 B C ln total U E t ... Discharge period in (s) U ... Operating voltage B C ... Partial capacitance of one phase U ... Maximum permissible voltage after period t T E C ... Total capacitance R ... Module resistance value total In all cases, the closest smaller discharge module available shall be applied. The discharge resistors may become very hot (up to 200C) during continuous operation For design L/M only: Remove the lid of the discharge module if applying protective caps to the capacitors Sets for CAPAGRIP L & M Capacitors (Protection: IP20) CAPAGRIP resistor modules can be connected to single capacitors as well as to groups of parallel units. Both type 1 and 2 are equally compatible with CAPAGRIP L or M terminals. 47 DISCHARGE DEVICESDISCHARGE DEVICES for latest edition and updates check www.powercapacitors.info Type 1 R module selection U max N 15,2 15,2 24 order code ) (V) (k type code 1000 3 Y 300 2 (1) 275.106-10300 1000 3 Y 180 2 (2) 275.106-10180 850 3 Y 120 2 (3) 275.106-10120 760 3 300 1 (4) 275.100-10300 720 3 180 2 (5) 275.105-10180 Type 2 15.2 15.2 24 600 3 180 1 (6) 275.100-10180 600 3 120 2 (7) 275.105-10120 480 3 120 1 (8) 275.100-10120 530 3 100 2 (9) 275.105-10100 480 3 82 2 (10) 275.105-10082 400 3 82 1 (11) 275.100-10082 440 3 68 2 (12) 275.105-10068 Sets for Design D1/D3 Capacitors (Protection: IP00) 3ph R module selection U max N order code (V) (k ) type code 16 16 three phase 750 2 300 D3 (13) 275.110-10301 630 2 200 D3 (14) 275.110-10201 16 16 600 2 180 D3 (15) 275.110-10181 480 2 120 D3 (16) 275.110-10121 1ph single phase 16 16 750 300 D1 (17) 275.111-10301 600 180 D1 (18) 275.111-10181 16 16 Selection Charts The selection charts state the maximum capacitance per voltage level which can be discharged with each resistor module: 1. Select the line of your operating voltage. Mind that in detuned systems, the actual voltage at the capacitor is higher than the rated mains voltage. 2. Look for the column with the capacitance which is closest to your capacitor. Look up BLACK figures if you want to discharge below 50 V within no more than 60 seconds. Look up BLUE figures if you want a discharge below 75 V within 3 minutes. Go for GREY figures if 5 min discharge is sufficient. 3. Determine the resistor module to be ordered in the head of the column. 48 DISCHARGE DEVICES 12 12 12 15 15 27 47 12