Clamp body and wedges: Al-alloy, sliding surfaces of wedges coated with lubricant
Straps: steel 8.8 / hot dip galvanized
Connecting bolt: type S, DIN EN 61284-1, steel grade 8.8 / hot dip galvanized, Copper split pin
Wedge-type tension clamps consist of a wedge chamber with fastening elements for anchoring and a wedge system for gripping the conductor.
The tension force gets directed towards the conductor via transverse pressure of the
the wedges via the outer conductor layer to the inner steel layers. The wedges ovalize the conductor without creating any arching inbetween the individual conductor layers.
In the case of composite conductors, the frictional connection between the conductor layers allows the steel core to sufficciently take a major fraction of the complete tension force. However the grease on the
steel core needs to get considered. While tensile forces on the conductor increase, the replenishment principle, in conjunction with the ovalized conductor structure, causes the wedge system to slide into the wedge chamber, increasing the transverse pressure on the conductor. Depending on the wedge angle some applications require longer wedges.
1. To ensure the support of the tensioned conductor during usual operational conditions.
By applying suitable design specifications, appropriate dimensions and suitable materials for the individual parts of the tensioning clamps, the cable ropes are held with at least 2.5 times the maximum tensile stress or with at least 85% of the nominal force of the cable rope. The lower value applies.
2. Absorption of rope vibrations excited by air currents in the tensioning field.
By using suitable tensioning clamp designs with a
- low mass moment of inertia of the vibrating clamp parts,
- low friction in the pivot points,
- double forks for attachment to the insulator chain or to the ground cable guy point,
- gradual increase of the transverse pressure, starting from the rope inlet of the guy clamp
the conditions are created to ensure that the fatigue strength of the single wires in the area of the guy clamp is not exceeded and to prevent single wire breaks in the rope in the clamping area and next to the guy clamp. The additional installation of vibration dampers next to the anchor clamps significantly reduces the stresses on the anchor clamps caused by rope vibrations.
1. safe transmission of the operating and short-circuit current into the current loop.
The safe transmission of the current into the current loop is ensured by the uncut passage of the conductor through the wedge type clamps or the suitable dimensioning of the clamping points for the current loop connection to compression type clamps where the conductor has to be cut.
2. safe transmission of short-circuit currents from the conductor into the tension arrangements (insulator chain, earth wire tension point).
Sufficient dimension of the tension clamps and low contact resistances between the conductor and the cable support in the tension clamp ensure the transfer of the earth short circuit currents of the rigidly grounded systems into the tension arrangements.
3. avoidance of partial discharges
By appropriate shaping and suitable inclusion of the tension clamps into the tension system of bundled conductor guy wires, the corona extinction voltage at the tension clamps is above the required levels.
Advantages of the wedge type clamps are:
- the open conductor channel or the two-part wedge chamber, which avoids "threading" of the conductor into the clamp
- the assembly without special tools
Body-side plate, body-rail and wedges: Al-alloy, sliding surfaces of wedges coated with lubricant
Straps: steel 8.8 / hot dip galvanized
Connecting bolt: type S, DIN EN 61284-1, steel grade 8.8 / hot dip galvanized, Copper split pin
The wedges ovalize the conductor without creating any arching inbetween the individual conductor layers.
In the case of composite conductors, the frictional connection between the conductor layers allows the steel core to sufficciently take a major fraction of the complete tension force. However the grease on the
steel core needs to get considered. While tensile forces on the conductor increase, the replenishment principle, in conjunction with the ovalized conductor structure, causes the wedge system to slide into the wedge chamber, increasing the transverse pressure on the conductor. Depending on the wedge angle some applications require longer wedges.
1. To ensure the support of the tensioned conductor during usual operational conditions.
By applying suitable design specifications, appropriate dimensions and suitable materials for the individual parts of the tensioning clamps, the cable ropes are held with at least 2.5 times the maximum tensile stress or with at least 85% of the nominal force of the cable rope. The lower value applies.
2. Absorption of rope vibrations excited by air currents in the tensioning field.
By using suitable tensioning clamp designs with a
- low mass moment of inertia of the vibrating clamp parts,
- low friction in the pivot points,
- double forks for attachment to the insulator chain or to the ground cable guy point,
- gradual increase of the transverse pressure, starting from the rope inlet of the guy clamp
the conditions are created to ensure that the fatigue strength of the single wires in the area of the guy clamp is not exceeded and to prevent single wire breaks in the rope in the clamping area and next to the guy clamp. The additional installation of vibration dampers next to the anchor clamps significantly reduces the stresses on the anchor clamps caused by rope vibrations.
1. safe transmission of the operating and short-circuit current into the current loop.
The safe transmission of the current into the current loop is ensured by the uncut passage of the conductor through the wedge type clamps or the suitable dimensioning of the clamping points for the current loop connection to compression type clamps where the conductor has to be cut.
2. safe transmission of short-circuit currents from the conductor into the tension arrangements (insulator chain, earth wire tension point).
Sufficient dimension of the tension clamps and low contact resistances between the conductor and the cable support in the tension clamp ensure the transfer of the earth short circuit currents of the rigidly grounded systems into the tension arrangements.
3. avoidance of partial discharges
By appropriate shaping and suitable inclusion of the tension clamps into the tension system of bundled conductor guy wires, the corona extinction voltage at the tension clamps is above the required levels.
Advantages of the wedge type clamps are:
- the open conductor channel or the two-part wedge chamber, which avoids "threading" of the conductor into the clamp
- the assembly without special tools
Clamp body: malleable cast iron or gray cast iron/ hot dip galvanized
Wedge with feed: aluminium alloy, slideways lubricated
U-bolts: steel grade 8.8/ hot dip galvanized
Nuts: steel grade 10/ hot dip galvanized
Connecting bolt: type S, DIN 48 073, steel grade 8.8/ hot dip galvanized, cotter pin A2
Wedge-type tension clamps consist of a wedge chamber with fastening elements for anchoring and a wedge system for gripping the conductor.
The tension force gets directed towards the conductor via transverse pressure of the
the wedges via the outer conductor layer to the inner steel layers. The wedges ovalize the conductor without creating any arching inbetween the individual conductor layers.
In the case of composite conductors, the frictional connection between the conductor layers allows the steel core to sufficciently take a major fraction of the complete tension force. However the grease on the
steel core needs to get considered. While tensile forces on the conductor increase, the replenishment principle, in conjunction with the ovalized conductor structure, causes the wedge system to slide into the wedge chamber, increasing the transverse pressure on the conductor. Depending on the wedge angle some applications require longer wedges.
1. To ensure the support of the tensioned conductor during usual operational conditions.
By applying suitable design specifications, appropriate dimensions and suitable materials for the individual parts of the tensioning clamps, the cable ropes are held with at least 2.5 times the maximum tensile stress or with at least 85% of the nominal force of the cable rope. The lower value applies.
2. Absorption of rope vibrations excited by air currents in the tensioning field.
By using suitable tensioning clamp designs with a
- low mass moment of inertia of the vibrating clamp parts,
- low friction in the pivot points,
- double forks for attachment to the insulator chain or to the ground cable guy point,
- gradual increase of the transverse pressure, starting from the rope inlet of the guy clamp
the conditions are created to ensure that the fatigue strength of the single wires in the area of the guy clamp is not exceeded and to prevent single wire breaks in the rope in the clamping area and next to the guy clamp. The additional installation of vibration dampers next to the anchor clamps significantly reduces the stresses on the anchor clamps caused by rope vibrations.
1. safe transmission of the operating and short-circuit current into the current loop.
The safe transmission of the current into the current loop is ensured by the uncut passage of the conductor through the wedge type clamps or the suitable dimensioning of the clamping points for the current loop connection to compression type clamps where the conductor has to be cut.
2. safe transmission of short-circuit currents from the conductor into the tension arrangements (insulator chain, earth wire tension point).
Sufficient dimension of the tension clamps and low contact resistances between the conductor and the cable support in the tension clamp ensure the transfer of the earth short circuit currents of the rigidly grounded systems into the tension arrangements.
3. avoidance of partial discharges
By appropriate shaping and suitable inclusion of the tension clamps into the tension system of bundled conductors, the corona extinction voltage at the tension clamps is above the required levels.
Advantages of the wedge type clamps are:
- the open conductor channel or the two-part wedge chamber, which avoids "threading" of the conductor into the clamp
- the assembly without special tools
Al tension sleeve, Jumper terminal: Aluminum alloy
Steel tension sleeve: Steel, forged / hot-dip galvanized
Connecting bolt: Type S, DIN 48 073, steel grade 8.8 / hot dip galvanized, cotter pin A2
Bolts, nuts: Stainless steel A2-80
Washers: Stainless steel 200 HV
The design of the compression tension clamps requires to cut the conductor at the anchorage point. In the case of composite conductors the steel core has to get carefully stripped, since it is tensioned
separately from the remaining conductor. Thus we ensure highest tension forces for the various conductor types and even composite conductors with a very large steel fraction can be safely tensioned. The jumper loop terminals are connected to the flat connection point of the tension clamp by 2 or 4 hexagonal screws. End point compression type tension clamps are not equipped with such flat connecting points.
While the steel sleeve is pressed continuously and overlapping, the outer aluminum sleeve has specific compression marks where the compression tool needs to get placed. The axial tensions between the conductor layers together with the contact adhesive grease applied inside the aluminum sleeve ensures reliable transmission of the conductor tensile force to the compression tension clamp.
1. To ensure the support of the tensioned conductor during usual operational conditions.
By applying suitable design specifications, appropriate dimensions and suitable materials for the individual parts of the tensioning clamps, the cable ropes are held with at least 2.5 times the maximum tensile stress or with at least 85% of the nominal force of the cable rope. The lower value applies.
2. Absorption of rope vibrations excited by air currents in the tensioning field.
By using suitable tensioning clamp designs with a
- low mass moment of inertia of the vibrating clamp parts,
- low friction in the pivot points,
- double forks for attachment to the insulator chain or to the ground cable guy point,
- gradual increase of the transverse pressure, starting from the rope inlet of the guy clamp
the conditions are created to ensure that the fatigue strength of the single wires in the area of the guy clamp is not exceeded and to prevent single wire breaks in the rope in the clamping area and next to the guy clamp. The additional installation of vibration dampers next to the anchor clamps significantly reduces the stresses on the anchor clamps caused by rope vibrations.
1. safe transmission of the operating and short-circuit current into the current loop.
The safe transmission of the current into the current loop is ensured by the uncut passage of the conductor through the wedge type clamps or the suitable dimensioning of the clamping points for the current loop connection to compression type clamps where the conductor has to be cut.
2. safe transmission of short-circuit currents from the conductor into the tension arrangements (insulator chain, earth wire tension point).
Sufficient dimension of the tension clamps and low contact resistances between the conductor and the cable support in the tension clamp ensure the transfer of the earth short circuit currents of the rigidly grounded systems into the tension arrangements.
3. avoidance of partial discharges
By appropriate shaping and suitable inclusion of the tension clamps into the tension system of bundled conductor guy wires, the corona extinction voltage at the tension clamps is above the required levels.