CABLE CLAMPS FOR LOW AND HIGH VOLTAGE CABLES Bauteile für die Elektrotechnik GmbH An der Molkerei 15 56288 Kastellaun Phone +49 6762 5658 Fax +49 6762 6638 w w w. id-technik.com info @ id-technik.com
Cable Clamps for Low and High Voltage Cables Series K Mechanical resistance to short-circuits: 10.000 N......... Page 2 Type K 26/38 K 36/52 K 50/75 K 66/90 outer cable diameter 26-38 mm 36-52 mm 50-75 mm 66-90 mm Series KT Mechanical resistance to short-circuits: 20.000 N...... Page 3 Type KT 25/39 outer cable diameter 25-39 mm Series KR Mechanical resistance to short-circuits: 20.000 N...... Page 4 Type KR 75/100 KR 100/130 KR 130/160 outer cable diameter 75-100 mm 100-130 mm 130-160 mm Cable Clamps for bundled fastening of Low Voltage Cables Series KS Mechanical resistance to short-circuits: 12.500 N........ Page 5 Type KS 25/36 KS 33/46 outer cable diameter 25-36 mm 33-46 mm Series KP Mechanical resistance to short-circuits: 25.000 N... Page 6 Type KP 29/41 KP 39/53 KP 51/64 outer cable diameter 29-41 mm 39-53 mm 51-64 mm Series KH Mechanical resistance to short-circuits: 25.000 N...... Page 7 Type outer cable diameter KH 73/86 73-86 mm KH 84/97 84-97 mm KH 105/117 105-117 mm KH 115/140 115-140 mm Accessories... Page 8/9 S 57/92 Distance wedge for Cable Clamps KH 73/86 und KH 84/97 S 90/112 Distance wedge for Cable Clamp KH 105/117 Elastic Inlay: Fixation of cables and padding of cables Examples of Fastenings......... Page 10 Short-Circuit Tests...... Page 14
Cable Clamps Application: Material: Properties: Fastening of all types of single- and multi-conductor high and low-voltage cables. Polyamide, fiberglass-reinforced, coloured black, flame resistant, special protection against ultraviolet rays, free of halogenes, fully recycable Tensile strength: 120 N/mm 2 Flexural strength: 210 N/mm 2 Thermal expansion: 0.01 % per 10 C temperature increase Flame resistance: UL94V-O and classification following DIN 5510, part 2, flamability class S3 Resistance to: ultraviolet rays, ozone, oils, fuels,alkalis, radioactive rays Temperature range: Ambient temperatures Continuous operation Short heating Constructional Features: down to -40 C up to 120 C up to 220 C admissible The fiberglass-reinforced polyamide used in manufacture is marked by particularly high mechanical strength and heat resistance. Implementation both indoor and outdoor due to resistance to ageing, ozone and ultraviolet rays. No alteration in strength within a temperature range of -40 to 120 C. Thus particularly suitable for emergency operations of XLPE insulated cables. Because of its resistance to radioactive rays (at a radiation dose of 100 MRAD strength loss is less than 20 %) implementation is also possible in nuclear power stations. As the length of the clamping area is very wide the mechanical pressure on the cables is low. The dynamic forces of high short-circuit currents are very effectively withstood. Implementation can be done in those cases where high short-circuit currents occur. Therefore a secure fixation of the cables is insured and damage to them is being avoided. The fastening of cable clamps can be adapted to all local conditions. Test reports from neutral laboratories concerning dynamic short-circuit currents, up to 110 ka, and the fire-resistance of the material, are available. 1
CABLE CLAMPS Series: K Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single- and multi-conductor cables. 26 mm - 90 mm 10.000 N 5 Nm Dimensions in mm Typ D Ø L B l d Ø H 1 H 2 h a K 26/38 26-38 90 60 60 12 34-46 45-57 18 7 K 36/52 36-52 105 60 75 12 39-55 53-69 23 8 K 50/75 50-75 126 60 95 12 46-71 67-92 30 9 K 66/90 66-90 158 70 120 14 65-89 91-115 42 10 D Ø : indicates the outer cable diameter range Example of fastening: Additional bottom parts for arrangement of several cables 2
CABLE CLAMPS Series: KT Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single- and multi-conductor cables 25 mm - 39 mm 20.000 N 5 Nm Dimensions in mm Typ D Ø L B l d Ø H 1 H 2 h a KT 25/39 25-39 107 60 65 13 46-60 55-69 27 15 D Ø : indicates the outer cable diameter range 3
CABLE CLAMPS Series: KR Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single- and multi-conductor cables 75 mm - 160 mm 20.000 N 8 Nm Dimensions in mm Typ D Ø L B b l d H 1 H 2 h a KR 75/100 75-100 180 77 44 150 14 68-93 105-130 52 13 KR 100/130 100-130 210 97 54 175 14 85-115 135-165 67 16 KR 130/160 130-160 250 97 54 210 18 113-143 170-200 85 20 D Ø : indicates the outer cable diameter range 4
CABLE CLAMPS Series: KS Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single-conductor cables in trefoil arrangement 25 mm - 46 mm 12.500 N 5 Nm The assembly hole in the bottom part of Series KS permits direct fastening to lattice, concrete and wooden masts, suitable for M 10 bolts. (see: Examples Of Fastenings For Clamps) Dimensions in mm Typ D Ø L B l d H 1 H 2 h a KS 25/36 25-36 150 80 110 12 55-75 77-97 35 19 KS 33/46 33-46 170 80 130 12 55-75 90-110 35 15 D Ø : indicates the outer cable diameter range of each of the cables 5
CABLE CLAMPS Series: KP Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single-conductor cables in trefoil arrangement 29 mm - 64 mm 25.000 N 8 Nm Dimensions in mm Typ D Ø L B l d H 1 H 2 h a KP 29/41 29-41 172 80 125 14 60-90 81-111 40 20 KP 39/53 39-53 190 80 145 14 63-93 101-131 45 20 KP 51/64 51-64 205 90 160 14 95-123 130-158 70 25 D Ø : indicates the outer cable diameter range of each of the cables 6
CABLE CLAMPS Series: KH Application: For cables with outer diameters of: Mechanical resistance to short-circuits: Maximum initial torque for fixing screws: Fastening of single-conductor cables in trefoil arrangement 62 mm - 140 mm 25.000 N 8 Nm Dimensions in mm Typ D Ø L B l d H 1 H 2 H 3 a KH 62/75* 62-75 225 90 185 18 80 114-142 172-200 30 KH 73/86 73-86 250 100 210 18 85 119-147 192-220 30 KH 84/97 84-97 270 100 230 18 95 128-156 214-242 30 KH 95/107* 95-107 290 100 250 18 103 136-164 244-262 30 KH 105/117 105-117 310 100 270 18 108 144-178 248-282 30 KH 115/140 115-140 365 120 320 18 145 182-242 270-330 35 D Ø : indicates the outer cable diameter range of each of the cables * Delivery times and minimum quantity per order on request 7
DISTANCE WEDGE FOR CABLE CLAMPS SERIES KH Application: For cables with outer diameters of: Material: Additional fastening of cables in trefoil arrangement, especially for vertical installations 57 mm - 112 mm Fiberglass-reinforced polyamide 5 100 The surfaces are roughened D : Admissible range of outer diameters of the single cables using distance wedges if padded to D S. To achieve an optimum tightening, the cables have to be padded to the below shown outer diameters. Dimensions in mm cable clamp type D wedge type D S KH 62/ 75 57-70 65-70 KH 73/ 86 68-81 S 57/92 77-81 KH 84/ 97 79-92 88-92 KH 95/107 90-102 97-102 KH 105/117 100-112 S 90/112 107-112 D D s 8
ELASTIC INLAY Application: Material: Padding of cables for elastic compressation of diameter variations caused by changes of load and ambient temperature Fixation of cables and support of weight in vertical installations One-side ribbed Neoprene Thickness: 5 mm Heigth of ribs: 2,5 mm Length: 100 mm, Also available in rolls lenght of 3 m Wide: 100 mm Examples for application: Torque for fixing screws: max. 20 Nm Important: Counternut with washer ( necessary for clamp series KR ) Elastic Inlay Torque for fixing screws: max. 20 Nm Distance wedge for additional fastening in KH clamps 9
- Examples of Fastenings For Clamps - Only KS Serie Bolt Size M 10 10
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Short-Circuit Experiments Test institute: Forschungsgemeinschaft für Hochspannungs- und Hochstromtechnik e.v. Hallenweg, 68219 Mannheim, Germany Date of test June 29, 1979 Parts tested: Test: Cable clamp, Model K 36/52 Fastening of individual singlecore cables Cable clamp, Model KP 39/53 Joint fastening of trefoils of single-core cables Experiments were meant to define the behaviour of cable clamps under dynamic strain applied by maximum shortcircuit currents up to 110 ka The following figures were assumed as admissible strain on cable clamps: Type K 36/52 maximum admissible strain = 10.000 N Type KP 39/53 maximum admissible strain = 25.000 N 2 I s F = 17,75 l a F l a I s : force applied by short circuit in Newtons : distance between clamps in meters : center-to-center distance between cables in meters : maximum short circuit in ka Test: Cable Clamp K 36/52 Three 10-KV single-core cables with cross-linked polyethylene insulation and cross sections of 400 mm² were laid out in parallel and fastened to a frame using the cable clamps in question. Test No. Is ka a cm 189-79/73 65,3 11,5 0,9 5.900 189-79/74 80,2 11,5 0,9 8.950 l m F N Findings: Cable Clamps withstood forces of 5.900 N and 8.950 N without any damage. However, considerable bending of cables was observed. Photographs 1 and 2 show test set-up before and after testing. 14
Test: Cable Clamp KP 39/53 Three twisted 20-kV single-core cables with cross-linked polyethylene insulation and cross sections of 300 mm² were laid out in a U-shape and held in trefoil arrangement by the cable clamps. Test No. Is ka a cm 189-79/71 64,9 4,3 1,05 18.250 189-79/72 64,3 4,3 1,31 22.350 189-79/75 80,0 4,3 0,84 22.200 189-79/76 81,3 4,3 1,05 28.650 189-79/78 110 4,3 0,44 22.000 189-79/79 111 4,3 0,44 22.400 l m F N Findings: Cable clamps withstood short-circuit forces of 18.250N to 28.560 N without damage. Photographs 3 to 6 show the behavior of the trefoil during and after the surge. Tests revealed that closer spacing of clamps slightly reduces heights cable jump to. Considerable bending of cables between clamps was observed. Photographs 7 and 8 show the trefoil before and after tests 189-79/78 and 189-79/79. Here, as well, there is considerable bending of cables after two 110-kA surges, although the 44 centimeters between clamps is the spacing normally used in practice. In these tests, the cables jumped to heights of only 0,2 to 0,3 m. 15
Result of the tests: Besides the fact that the tested cable clamps meet the requirements placed on them, these experiments show that: 1. When using single-core cable, we recommend that the dynamic forces of the short-circuit current be considered as well, not only its thermic effects. 2. In order to prevent excessive bending of cables between clamps, the latter may have to be spaced closer together for high short-circuit currents than their maximum admissible strain would normally dictate. 3. With high short-circuit currents, simply arranging the cables in trefoil and laying them on racks, for instance, is not enough. As Photographs 3 to 6 show, the bundled cables can be damaged during jumps, or they may damage other system parts. In such cases, it appears expedient to connect the trefoil to the rack at appropriate intervals, bearing in mind that the rack itself must be able to withstand a certain amount of strain. However, these tests do not allow us to state how high such strain may be. 16
Photograph 1 Test set-up for tests 189-79/73 74 and 80 Photograph 2 After test 189-79/73 and 74 Max. short-circuit current: 65,3 ka and 80,2 ka Short-circuit force: 5.900 N and 8.950 N 17
Photograph 3 Test 189-79/72 During surge Max. short-circuit current: 64,3 ka Short-circuit force: 22.350 N Photograph 4 Test 189-79/75 During surge Max. short-circuit current 80,0 ka Short-circuit force: 22.200 N Photograph 5 Test 189-79/76 During surge Max. short-circuit current 81,3 ka Short-circuit force: 28.650 N Photograph 6 Test 189-79/76 After test 18
Photograph 7 Test set-up for tests 189-79/78 and 79 Photograph 8 After test 189-79/78 and 79 Max. short-circuit current: 110 ka Short-circuit force: 22.000 N 19