MV Surge Arresters

SNO – RP

Silicone rubber-housed metal oxide surge arrester for medium-voltage applications. Class DH according to IEC 60099-4:2014. Uc 2.4–44 kV, Ur 3–55 kV, In 10 kA, IP67. High voltage rating.

SNO – RP

SNO-R is a metal oxide surge arrester that provides protection against overvoltages and transient events in medium-voltage networks up to 52 kV.

The varistor block is directly molded with silicone rubber. This manufacturing method prevents moisture ingress, provides structural rigidity to the housing, and eliminates air gaps between the varistor and the housing.

The product is certified as Class DH in accordance with the latest edition of IEC 60099-4 (2014, Ed. 3.0). According to the manufacturer, Class DH surge arresters can absorb 122% more energy than Class 1 arresters: 40 kJ/kV compared to 18 kJ/kV.

Manufactured in an RP housing design. Suitable for both indoor and outdoor installations.

HIGHLIGHTED FEATURES

  • Class DH — certified according to the current IEC 60099-4:2014 version.
  • Varistor directly molded with silicone rubber
  • IP 67 protection class
  • UV and chemical resistant, self-cleaning silicone surface
  • −60 °C … +85 °C operating range
  • Low residual voltage
  • High energy absorption capacity
  • Rigid housing construction
  • 100% final inspection in the manufacturer's laboratory
  • Each arrester is marked with an indelible measurement number
  • Accredited laboratory certified

GENERAL TECHNICAL DATA

Parameter Value
Surge arrester type SNO
Commercial designation (housing form) RP
IEC class DH
Standard IEC 60099-4:2014, IEC 60099-5
Continuous operating voltage (Uc) 2,4 – 44 kV
Rated voltage (Ur) 3 – 55 kV
Nominal discharge current (In, 8/20 µs) 10 kA
High impulse current (4/10 µs) 100 kA
Short-circuit current (Isc) 20 kA
Thermal load transfer value (Qth) 1,1 C
Repeated load transfer rate (Qrs) 0,4 C
Cantilever withstand voltage (Ur = 55 kV) 250 Nm
Vertical load (Fv) 800 N
Terminal tightening torque (Ur = 55 kV) 50 Nm
Protection class IP 67
Ambient temperature −60 °C … +85 °C
Body material Silicone rubber
Body color Grey
Connection thread M12 × 27 mm
Upper terminal M12 × 25
Bottom terminal M12 × 20
Base diameter Ø140 mm

VOLTAGE LEVELS AND TECHNICAL TABLE

Electrical characteristics

Ur [kV] Uc [kV] Ures 1/2,5 µs 10 kA [kV] Ures 8/20 µs 5 kA [kV] Ures 8/20 µs 10 kA [kV] Ures 8/20 µs 100 A [kV] Upeak 1,2/50 µs [kV] Urms 50 Hz 1 dk [kV]
3,0 2,4 7,73 6,84 7,39 5,59 90 35
6,0 4,8 15,47 13,69 14,77 11,17 90 35
9,0 7,2 23,20 20,53 22,16 16,76 90 35
12,0 9,6 30,94 27,38 29,54 22,34 105 40
15,0 12,0 38,67 34,22 36,93 27,93 105 40
18,0 14,4 46,40 41,06 44,32 33,52 120 45
21,0 16,8 54,14 47,91 51,70 39,10 120 45
24,0 19,2 61,87 54,75 59,09 44,69 130 50
25,0 20,0 64,45 57,03 61,55 46,55 130 50
27,0 21,6 69,61 61,60 66,47 50,27 130 50
27,5 22,0 70,90 62,74 67,71 51,21 140 65
30,0 24,0 77,34 68,44 73,86 55,86 150 75
33,0 26,4 85,07 75,28 81,25 61,45 150 75
36,0 28,8 92,81 82,13 88,63 67,03 150 75
39,0 31,2 100,54 88,97 96,02 72,62 160 80
42,0 33,6 108,28 95,82 103,40 78,20 170 85
45,0 36,0 116,01 102,66 110,79 83,79 170 85
48,0 38,4 123,74 109,50 118,18 89,38 170 85
51,0 40,8 131,48 116,35 125,56 94,96 180 90
55,0 44,0 141,79 125,47 135,41 102,41 180 90

Mechanical characteristics

Ur [kV] SSL [N] SLL [N] AD [mm] CD [mm] A [mm] B [mm] H [mm] N
3,0 1888 1437 154 343 80 100 136 3
6,0 1888 1437 154 343 100 120 136 3
9,0 1888 1437 154 343 120 140 136 3
12,0 1528 1163 186 453 140 160 168 4
15,0 1528 1163 186 453 160 180 168 4
18,0 1284 975 218 563 180 200 200 5
21,0 1284 975 218 563 200 220 200 5
24,0 1106 841 250 674 220 240 232 6
25,0 1106 841 250 674 240 260 232 6
27,0 1106 841 250 674 260 280 232 6
27,5 976 742 282 784 270 300 263 7
30,0 870 662 314 894 300 320 295 8
33,0 870 662 314 894 320 340 295 8
36,0 870 662 314 894 340 360 295 8
39,0 785 597 345 1004 380 400 327 9
42,0 715 544 377 1114 400 420 359 10
45,0 715 544 377 1114 420 440 359 10
48,0 715 544 377 1114 440 460 359 10
51,0 656 500 409 1234 460 480 391 11
55,0 656 500 409 1234 470 490 391 11
  • Indoor and outdoor installation
  • Protection of electrical equipment
  • Protection of compensation devices
  • MV distribution networks (up to 52 kV)
  • Railways
  • Mines
  • Substations and distribution panels
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