specifications are subject to change without notice (19.07.06) 1 current and voltage controls ? 3-phase current metering transformers f or use with current control relays ? measuring ranges: a 74-10 5: 0.5 - 5 aac a 74-10 20: 2 - 20 aac a 74-11 100: 10 - 100 aac a 74-11 500: 50 - 500 aac product description 3-phase current transformer measures on all three phases. output voltage pr oportional ordering key type input current to measured amplitude of the rms-value of the normal phase cur rent. type selection input cur r ent type no. 5 aac a 74-10 5 20 aac a 74-10 20 100 aac a 74-11 100 500 aac a 74-11 500 input specifications a 74-10 5 a 74-10 20 a 74-11 100 a 74-11 500 output voltage (t a = 20 = 68?, r l = 9.5 k ) 0.4 - 4 v p 0.4 - 4 v p 0.4 - 4 v p 0.4 - 4 v p output impedance < 700 < 200 < 40 < 10 t olerance of output voltage @ rated input current 5% 5% 5% 5% t emperatur e variation 0.1% per c 0.1% per c 0.1% per 0.1% per rated insulation voltage (cable) 250 v ac r ms 250 v ac r ms 250 v ac r ms 250 v ac r ms output specifications current transformer, 3-phase types a 74-10, a 74-11 a 74-10 5 a 74-10 20 a 74-11 100 a 74-11 500 cur rent range 0.5 - 5 aac 2 - 20 aac 10 - 100 aac 50 - 500 aac max. current (continuously) 20 aac 50 aac 250 aac 750 aac max. overload current (t = 30 s) 40 aac 85 aac 325 aac 1000 aac rated insulation voltage input-output 1000 v ac r ms 1000 v ac r ms 1000 v ac r ms 1000 v ac r ms overvoltage category iv (iec 60664) iv (iec 60664) iv (iec 60664) iv (iec 60664) dielectric strength dielectric voltage 6 kvac rms 6 kvac rms 6 kvac rms 6 kvac rms rated impulse withstand volt. 12 kv (1.2/50 s) 12 kv (1.2/50 ?) 12 kv (1.2/50 ?) 12 kv (1.2/50 ?) power consumption < 0.1 w@5 a < 0.25 w@20 a < 1.5 w@100 a < 21 w@1500 a a 74-10 5
2 specifications are subject to change without notice (19.07.06) a 74-10, a 74-11 general specifications p ollution degree 3 (iec 60664) a mbient temperature - 20 to + 60 (--4 to + 140) h ousing d imensions a74-10 120 x 45 x 16 mm a 74-11 150 x 114 x 23 material abs weight a 74-10 200 g a 74-11 750 g connection cable 2 m pvc, 4 x 0.4 mm 2 a pproval u l ce marking ye s t he current metering trans- f ormer is connected to the current control relays h 475 as follows: red core to term. 5 - u 1 . white core to term. 6 - u 2 . yellow core to term. 7 - u 3 . black core to term. 8 . ( starpoint - neutral). the metered conductor is drawn through the central hole of the current metering transformer. drawing the con- mode of operation d uctor through the hole sever- a l times makes it possible to meter currents below the no- minal range. if the conductor is drawn through the central hole e.g. 5 times, the metering trans- former will register 50 a when t he current in the conductor is 1 0 a. in amplitude and phase the output voltage is proportional to the phase current metered. wiring diagrams output voltage a 74-10 .. a 74-11 .. input current red white yellow black u 1 red black u 3 y e llow u 2 white u 1 red u 2 white u 3 y ellow black dimensions correct connection i ncor rect connection
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