Modular units

DE58402
Generalities Description of the control/
monitoring & protection functions
CRa, CRb, CRc current sensor
Current sensor for VIP 35 and VIP 300LL
and Sepam series 10 for 24 kV
Type Dimensions (mm) Weight Ratio of Class of precision VIP 35 VIP 300LL Sepam 10
External Internal Thickness (kg) transformation
Ø Ø (without
fastening)
CRa 143.5 81 37.5 2.18 1/200 ± 2% from 10 A to 100 A
± 1% from 100 A to 1600 A
On load 5.7 Ω (cal. x 1) b b
± 1% from 10 A to 10 kA On load 0.67 Ω (cal. x 4)
CRb 143.5 81 37.5 1.26 1/1250 ± 1% from 10 A to 11 kA On load 5.7 Ω (cal. x 1) b b
± 1 % from 10 A to 25 kA On load 0.67 Ω (cal. x 4)
CRc 143.5 81 37.5 2 S1-S2: 1/200 S1-S2:
± 5% from 10 A to 80 A
± 2.5 % from 80 A to 600 A
On load 0.6 Ω b
S1-S3: 1/500 S1-S3:
± 2% from 20 A to 2200 A
General common selection of protection units
Protection type Code Protection units
Sepam VIP
series 10 series 20 series 40 series 80 35 300
Three-phase overcurrent 50 - 51 b b b b b (2) b (1)
Zero-sequence overcurrent 50N - 51N b b b b b (3) b (1)
Directional zero-sequence current 67N b b
Undervoltage 27 b b
Overvoltage 59 b b
Thermal image 49 b b b b
Zero-sequence overvoltage 59N b b
Negative sequence overcurrent 46 b b b
Long start-up and rotor blocking 51LR b b b
Maximum number of start-ups 66 b b b
Single-phase undercurrent 37 b b b
Communication b b b b
(1) DT, EI, SI, VI and RI trip curves.
(2) Inverse curve suited to transformer protection.
(3) DT trip curve.
40 AMTED398078EN.indd