Discrimination of the direct current circuit breakers
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1 Discrimination of the direct current circuit s DB Continuity of service of the solutions Discrimination of the direct current protection devices Discrimination is a key element that must be taken into account right from the design stage of a low-voltage installation to allow continuity of service of the electrical power. Discrimination involves coordination between two circuit s connected in series, so that in the event of a fault, only the circuit positioned immediately upstream of the fault trips. A discrimination current Is is defined as: bbi fault < Is: only D2 removes the fault, discrimination ensured, bbi fault > Is: both circuit s may trip, discrimination not ensured. 0 D2 Only D2 trips Is D1 and D2 trip I fault Discrimination may be partial or total, up to the breaking capacity of the downstream circuit. To ensure total discrimination, the characteristics of the upstream device must be higher than those of the downstream one. The same principles apply to designing both direct current and alternating current installations. Only the limit currents change when direct current is used. DB Once again, we find the same concepts of discrimination: bbtotal: up to the breaking capacity of the downstream device. Our tests have been performed at up to 25 ka depending on the breaking capacity of the devices in question (20 ka pour C60H-DC), bbpartial: indication of the discrimination limit current Is. Discrimination is ensured below this value; above this value, the upstream device participates in the breaking process, bbnone: no discrimination ensured, the upstream and downstream circuit s will trip. Total discrimination solutions In the following tables, we offer you solutions that favour continuity of service (total discrimination between circuit s), for different short-circuit currents. For further information about the discrimination concept for protection devices in general, refer to technical supplement 557E4300, "Discrimination of modular circuit s". For further information about direct current applications, refer to technical supplement CA908032, " s for direct current applications". 1
2 Discrimination of the direct current circuit s Choice of the discrimination table Voltage Ue Tables Distribution with earthed polarity Distribution with earthed Protection non exigé Protection exigée mid-point In In In a a a Distribution isolated from earth In a Un R Un R Un/2 + Un/2 R Un R B A B A B A B A b C b C D b C Up to Up to 125 V DC Up to 250 V DC Tables 60 V page 3 Tables 125 V page 9 Tables 125 V page 9 ic60 1P + ic60 1P ic60 2P + ic60 2P ic60 2P + ic60 2P C120/NG125 1P + ic60 1P C120/NG125 2P + ic60 2P C120/NG125 2P + ic60 2P C60H-DC 1P + C60H-DC 1P C60H-DC 2P + C60H-DC 2P C60H-DC 2P + C60H-DC 2P C60H-DC 2P + C60H-DC 2P C120/NG125 1P + C60H-DC 1P C120/NG125 2P + C60H-DC 2P C120/NG125 2P + C60H-DC 2P C120/NG125 2P + C60HDC 2P ic60 2P + ic60 2P (see tables 60 V) ic60 3P + ic60 3P (see tables 60 V) ic60 2P + ic60 2P (see table 60 V) C120/NG125 2P + ic60 2P (see table 60 V) C60H-DC 2P + C60H-DC 2P C60H-DC 2P + C60H-DC 2P C60H-DC 2P + C60H-DC 2P C60H-DC 2P + C60H-DC 2P C120/NG125 2P + C60H-DC 2P C120/NG125 3P + C60H-DC 2P C120/NG125 2P + C60H-DC 2P C120/NG125 4P + C60H-DC 2P 2 Version : 1.1 CA908060E
3 : ic60 curve B : ic60 curves B, C, D ic60n/h/l Curve B In (A) ic60n/h/l B 1 T T T T T T T T T T 2 T T T T T T T T T T T T T T T T T T u 16 C 1 T T T T T T T T T T 2 T T T T T T T T T T T T T T T T T T u 16 D 1 T T T T T T T T T T T T T T T T T T T T T T T T T u 16 Note: This table can be used up to 125 V DC if ic60 (/) have 2 poles in serial to cut the current. 700 Discrimination limit = 700 A 3
4 : ic60 curve C : ic60 curves B, C, D ic60n/h/l Curve C In (A) ic60n/h/l B 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T C 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T D 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T Note: This table can be used up to 125 V DC if ic60 (/) have 2 poles in serial to cut the current. 700 Discrimination limit = 700 A 4 Version : 1.1 CA908060E
5 : ic60 curve D : ic60 curves B, C, D ic60n/h/l Curve D In (A) ic60n/h/l B 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T C 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T D 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T Note: This table can be used up to 125 V DC if ic60 (/) have 2 poles in serial to cut the current. 700 Discrimination limit = 700 A 5
6 : C120, NG125 curve B : ic60 curves B, C, D Curve B ic60n/h/l B 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 25 C 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 25 D 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 25 Note: This table can be used up to 125 V DC if C120/NG125 and ic60 (/) have 2 poles in serial to cut the current. 700 Discrimination limit = 700 A 6 Version : 1.1 CA908060E
7 : C120, NG125 curve C : ic60 curves B, C, D Curve C ic60n/h/l B 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 40 C 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 40 D 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 40 Note: This table can be used up to 125 V DC if C120/NG125 and ic60 (/) have 2 poles in serial to cut the current. 500 Discrimination limit = 500 A 7
8 : C120, NG125 curve D : ic60 curves B, C, D Curve D ic60n/h/l B 1 T T T T T T T T T T T 3 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T C 1 T T T T T T T T T T T 3 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T D 1 T T T T T T T T T T T 3 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T Note: This table can be used up to 125 V DC if C120/NG125 and ic60 (/) have 2 poles in serial to cut the current Discrimination limit = 5000 A 8 Version : 1.1 CA908060E
9 125 V DC : C60H-DC curve C : C60H-DC curve C Operating voltage (Ue): up to 125 V C60H-DC Curve C In (A) C60H-DC C 0.5 T T T T T T T T T T T T T T T T T T T T T T T T T T T u 10 Note: This table can be used up to 250 V DC if C60H-DC (/) have 2 poles in serial to cut the current. 500 Discrimination limit = 500 A 9
10 125 V DC : C120, NG125 curves B, C, D : C60H-DC curve C Operating voltage (Ue): up to 125 V Curve B C60H-DC C T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T Curve C C60H-DC C 0.5 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 32 Curve D C60H-DC C 0.5 T T T T T T T T T T T 1 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T u 50 Note: These tables can be used up to 250 V DC if C120/NG125 and C60H-DC (/) have 2 poles in serial to cut the current. T Total discrimination. 500 Discrimination limit = 500 A 10 Version : 1.1 CA908060E
11 Discrimination of the direct current circuit s (cont.) TEvolutions his page must be removed before publishing /10/2016 New tables Sonovision /04/2016 Creation Sonovision Indice Date Modification Name 11
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