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ABB Electrical Installtion Handbook by Malestorm

By Malestorm

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2 Trip curves 3 General characteristics 3 General characteristics Trip curve thermomagnetic release T4 250 MA Example of thermomagnetic release setting Consider a circuit-breaker type T1 160 In 160 and select, using the trimmer for thermal regulation, the current threshold, for example at 144 A; the magnetic trip threshold, fixed at 10·ln, is equal to 1600 A. Note that, according to the conditions under which the overload occurs, that is either with the circuit-breaker at full working temperature or not, the trip of the thermal release varies considerably.

9-1 In disabled at 8 In t=k 10-1 10-1 T7 S,H,L t=k T7 V 10-2 10-2 10-3 10-3 10-1 10 1 10 x In 102 I [kA] 10-1 1 10 10 2 I [kA] For T7 In = 1250 A, 1600 A ⇒ I3 max = 12 x In. 13 0,5 0,4 103 102 0,7 0,95 0,6 0,8 1 0,9 1,5 t [s] t [s] 2 D C 102 10 B 4 A 6 8 D C 101 1 10 12 B A 1 10-1 10-2 10-3 10-1 10 1 10 2 I [kA] 10-2 10-1 1 1,05 101 Note: for PR211/P-I releases, consider the curves relevant to function I only. 2 Trip curves 3 General characteristics 3 General characteristics Trip curve electronic releases Trip curve electronic releases S7 PR212/MP 103 13 I Function Emax PR121/P PR331/P 104 L- I Functions 103 12 11 102 10 t [s] 9 t [s] 8 102 7 10 6 101 1 1 10-1 1SDC200100F0001 10-1 10-2 10-2 10-3 10-1 PR212/MP 1 1,05 101 102 GSIS0219 10-1 10-3 1 101 102 x In x In I3 (6 - 7- 8 - 9 - 10 - 11 - 12 - 13 - OFF) x In The tolerances are according to IEC 60947-4-1.

12 12 I2t ON 10 10 102 102 1 1 T4 T5 400 I2t OFF 10-1 10-1 T5 630 T7 S,H,L 10-2 10-2 T6 630 T7 V T6 800 T6 1000 10-3 10-3 10-1 1 10 1 x In 2 10 I [kA] 10-1 1 10 10 x In 102 I [kA] Note: For all the CT sizes the maximum delay t1 is equal to 18s, except for 320 A CT (T4) and 630 A (T5) where t1=12s. For T4 In = 320 A, T5 In = 630 A and T6 In = 630 A ⇒ I3 max = 10 x In. Only the electronic settings are available. 9-1 In disabled at 8 In t=k 10-1 10-1 T7 S,H,L t=k T7 V 10-2 10-2 10-3 10-3 10-1 10 1 10 x In 102 I [kA] 10-1 1 10 10 2 I [kA] For T7 In = 1250 A, 1600 A ⇒ I3 max = 12 x In.

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