Nylon Trefoil Clamp

• avoid loss of current
• Smooth finish
• Easy to install

• F. R. P.
• Glass filled moulded nylon, Nylon 6
• Cast aluminum [ lm-6 ]
• Aluminum strip Nylon
• Pvc / hdp

• F.r.p. Glass fiber filled
• Nylon 6
• Cast aluminum [ lm-6 ]
• Aluminum strip, [ 25 x 3 mm, 25 x 5 mm, 30 x 4 mm,50 x 6 mm ]
• C.a. Single & double claw type
• Pvc / hdpp / pp
• Pg emc cable glands – [ wp & flp ]
• Rp junction boxes & trays

• The short circuit test report no: plv/10/sc/170, dated 24-05-2007 of m/s
• Erda, vadodara, baroda, gujarat for type test will be provided
• For rms value: 40 ka, for 1 seconds peak value: 100 ka

• Frp trefoil clamps are used for high voltage single core cables where the current rating is high and 3 core cables are not available
• The trefoil clamps are used for laying single core cables in trefoil touching formation which helps to maintain magnetic symmetry thereby avoiding electro magnetic heating and loss of current
• It’s nullify the induced magnetic field of high voltage power cable
• The aluminium trefoil clamps are protection of power and control cable from the lightning discharges and establishment of easy cable circulation paths
• Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths
• The distances between single core cables running in parallel determine the voltages induced
• With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimized and hence the circulating currents
• The circulating currents cause localized heating

• Frp trefoil clamps are suitable for supporting single core pvc/ hrpvc, xlpe, xlpe insulated aluminum, un- armoured, earth and un earth power cables from 1.1 kv to 132 kv grade
• 3 phase a.c. Circuits in trefoil formation in generation stations, sub-stations, thermal power stations, switchgear plants, industrial installation, terminal kits, and straight through jointing kits etc
• These can be used for indoor or outdoor for vertical or horizontal running cables inside trenches or on racks / galleries

• Tensile modulus: 19000 kg/cm2
• Flexural modulus: 9750 kg/cm2
• Izod impact strength: 8.0 kg cm/cm of notch
• Volume resistivity: 1014 to 1015 ohm-cm
• Surface resistivity: 1012 to 1013 ohm
• Melting point: 216ºc

Purpose of use of Trefoil Clamps :

• Trefoil Clamps are used for high voltage single core cables where the current rating is high and 3 core cables are not available. The Trefoil Clamps are used for laying single core cables in Trefoil touching formation which helps to maintain magnetic symmetry thereby avoiding electro magnetic heating and loss of current. It’s nullify the induced magnetic field of high voltage power cable.
• The Trefoil Clamps are Protection of power and control cable from the lightning discharges and Establishment of easy cable circulation paths.
• Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimized and hence the circulating currents. The circulating currents cause localized heating

Note :

Only our copy of Test Report of SHORT CIRCUIT No: PLV/10/SC/170 of M/s. ERDA, Vadodara for TYPE TEST for 1 Seconds & 3 second - Peak Value: 105 kA will be provided- for other extra TCs charges will be extra at actual as per third party Lab

A), Tested for 1 seconds for FRP, Nylon Trefoil Clamps- Peak Value: 105 KA

B), Tested for 3 seconds for Pressure Die-Cast Solid Aluminum Trefoil Clamp Peak Value:104 KA

for International standards

TREFOILLING is essential for Single core cables

Trefoil Clamps are used for high voltage single core cables where the current rating is high and 3 core cables are not available.
The Trefoil Clamps are used for laying single core cables in Trefoil touching formation which helps to maintain magnetic symmetry thereby avoiding electro magnetic heating and loss of current.

It does nullify the induced magnetic field of high voltage power cable.

The Trefoil Clamps are Protection of power and control cable from the lightning discharges and Establishment of easy cable circulation paths. Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimized and hence the circulating currents. The circulating currents cause localized heating.