Sheath Voltage Limiters

Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up ...

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HC Sheath Voltage Limiters

With 50 years of experience in surge protection, AREVA provides products suitable to the user’s expectations. HC sheath voltage limiters are surge arresters required for the reliability of electrical sections built with underground cables. The overvoltage protection provided by a surge arrester ensures both personnel and equipment safety, thus optimizing operating costs. THE RIGHT SURGE ARRESTER AT THE RIGHT PLACE ! Our HC surge arresters are designed for overvoltage protection of Power Distribution or Power Transmission underground cables sheathes. Their composite technology provides both high electrical performance and optimized conditions for implementation. Two ranges of products are available : VARISILTM HC surge arresters for connection to single point bonded sections and RNL HC surge arresters for use inside cross-bonding cabinets. The features of HC sheath voltage limiters are in accordance with CIGRE recommendations and IEC 60099-4 principles.

Customer benefits :

. System reliability . Easy to install . Enhanced safety

RNL HC Conductor Sheath Cables

Cabinets with 3 RNL HC

Local earth Local earth

Local earth

Dimensions and fittings

Electrical features

Reference

HC 1

HC 2

HC 3

HC 6

L1 (±1.5 mm)

31.5

39,5

51

63

Rated voltage Ur (kV rms)

101

Continuous operating voltage Uc

75

87

(kV rms)

b2

106.5

114.5

126

138

Nominal discharge current In

b3

81.5

89.5

101

113

(kA 8/20)

b0

14 x 18

High current impulse withstand

b1

13 x 26

(kA 4/10)

b2

10 x 25

Long duration current withstand

b3

18 x 38

(A 2000 µs)

b0

107.5

115.5

127

139

Maximum residual voltage

b1

91.5

99.5

111

123

at 10 kA 8/20

b2

143.5

151.5

163

175

= protective level (kV peak)

b3

139.5

17.5

159

171

b0/b2/b3

59

b1

80

b0

48

Mounting options

b1/b2/b3

40

b0/b1/b2

2

b3

3

b0 b1 b2 b3

Approximate weight (kg)

0.3

0.35

0.45

: : : :

HC 6

1

2

3,3

6

0.8

1.6

2.7

4.8

10

10

10

10

65

65

65

65

150

150

150

150

3

6

10

18

medium brackets short brackets long brackets asymmetrical brackets

0.6

dxL

1

ø48

3 2 4 5

1 2 3 4 5

-

End stud Locking nut Synthetic housing Contact disk Metal oxide varistor

H

e (mm)

89

63.5

HC 3

L3

P (mm)

77.5

55.5

HC 2

L1

H (mm)

69.5

HC 1

L2

L3 (±2.5 mm)

b0 b1

L3

d x L (mm)

Reference

L2 L1

L2 (±2 mm)

Local earth

Local earth

dxL

b0 / b1/ b2

e P

b3

VARISILTM HC Cable

Sheath

1

Conductor 2

3 VARISILTM HC

4

Local earth

5

Local earth

6

VARISILTM HC

VARISILTM HC

7 Local earth

Insulated grounding conductor

Local earth

Electrical features Reference Rated voltage Ur (kV rms)

HC 05

HC 10

HC 12

HC 15

HC 18

5

10

12

15

18

8

Continuous operating voltage Uc (kV rms)

4

8

9.6

12

14.4

Nominal discharge current In (kA 8/20)

10

10

10

10

10

High current impulse withstand (kA 4/10)

65

65

65

65

65

Long duration current

150

150

150

150

150

31.5

31.5

31.5

31.5

31.5

14

28

34

42

51

380

380

380

380

380

HC 05

HC 10

HC 12

HC 15

HC 18

H0 (mm)

195

195

195

195

195

Mounting options

H1 (mm)

255

255

255

255

255

H2 (mm)

290

290

290

290

290

NO : basic version P2 : with square pedestal (+ 0.7 kg) IP2 : with insulated square pedestal (+ 1.0 kg)

Weight no version (kg)

1.4

1.6

1.7

1.8

1.9

9 10

impulse withstand (A 2000 µs) Short circuit withstand (kA rms/0.2 s) Maximum residual voltage at 10 kA 8/20 = protective level (kV peak) Nominal creepage distance (mm)

Dimensions and fittings Reference

M 12 Connecting clamp

P2 option

H0

H1

NO

Pedestal

Insuled pedestal

110

140 110

140 110

110

Note : connection via terminal lugs or connecting clamp if conductor diameter <18 mm.

140

IP2 option

ø87 H0

ø87

ø87

Connecting clamp

H2 H1

Connecting clamp

H0

- Stainless steel top stud - Securing nut - Stainless steel top cap - Aluminium electrode - Metal oxide varistor - Synthetic tape - Composite wrapping - Silicone rubber housing - Stainless steel bottom cap - Stainless steel bottom stud

M 12

M 12

H1

1 2 3 4 5 6 7 8 9 10

140

Use of 4 fixing HM8 bolts

50 Hz applied voltage (p.u. of Ur)

HC

Permissible duration (s)

Example Cable features : - single point bonded cable - Uw = 55 kV - usc = 300 V/kA/km - Isc = 31.5 kA / 1 s - L = 1.8 km

The selection of the appropriate reference within the range is based on two considerations having opposite impacts : Sheath voltage limiter selection : - the 1.2/50 lightning impulse withstand level of the sheath, which depends on the external insulation of the cable, tends to minimize the required protective level, - the voltage induced at the connecting point of the device in case of short circuit on the main conductor, which depends on the short circuit power and on the length of the cable to be protected, leads to maximize the rated voltage. A protective margin greater than 20 % is recommended between the protective level of the surge arrester (Up) and the lightning impulse withstand level of the sheath (Uw). On the other hand, the level/time values (Usc/T) of the voltage induced on the sheath in case of short circuit must be below the minimum voltage vs time characteristic curve of the surge arrester.

a) VARISILTM HC b) 20% protective margin : Up < Uw/1.2 so that Up < 46 kV c) voltage withstand under short circuit conditions : Usc = usc x Icc x L = 17 kV and U (T = 1 s) = 1.2 x Ur according to the above curve give 1.2 x Ur > 17 so that Ur > 14.2 kV. Here, the calculations lead to VARISILTM HC 15 model.

Whenever several references meet both requirements, the final choice will be made by the user with respect to operation requirements and priorities. Basically, the surge arrester with lower rated voltage will provide improved protection whereas the surge arrester with higher rated voltage will better withstand short circuit stresses. Any surge arrester in-between will be a compromise. Should no reference fulfil both requirements, the protection should be achieved at shorter intervals so as to allow the use of a surge arrester having a lower rated voltage.

Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, this brochure should only be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advise on the application of any product referred to in it. We cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.

TRIDELTA Parafoudres S.A. Boulevard de l'Adour - 65202 BAGNERES DE BIGORRE - FRANCE Tel : + 33 (0)5 62 95 84 50 www.tridelta.de

HC - GB - 12/2009. TRIDELTA, the AREVA logo and any alternative version there of are trademarks and service marks of TRIDELTA. All trade names or tradmarks mentioned herein whether registred or not, are the property of their owners.

The choice of the range must be made according to the application : - RNL HC range for mounting in cabinets with crossbonding, - VARISILTM HC for mounting at ends of single point bonded sections.