OPPC - Optical Phase Conductor / OPPC - Optical Phase Conductors

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OPPC Application

Medium-voltage and high-voltage lines up to 150kV may not be equipped with a ground wire. To equip such lines with optical fibres, an Optical Phase Conductor (OPPC) may be used consequently, where a replacement by an Optical Ground Wire is not feasible.

OPPC Materials

Electrical and mechanical requirements are met thanks to a specific combination of the materials, AlMgSi, galvanized steel and aluminium-clad steel. The actual communication elements - the glass fibres - are arranged in stainless steel loose tubes which, together with a moisture repellent gel, form optimum protection against moisture.

OPPC Design

Starting with a core wire made of aluminium, AlMgSi, steel or aluminium-clad steel wire, a combination of stainless steel loose tubes and the above materials are stranded in the first layer, with one or more layers in addition, depending on the static and electrical engineering requirements. Also the core can be replaced by a stainless steel loose tube.

OPPC Common Construction AACSR/ACS 94/47 1C	OPPC Singlemode Fiber	OPPC Special Construction	OPPC Special Construction			aluminium alloy conductor
						steel tube
						ACS wire

Up to three wires of the inner layer as well as the core can be replaced by steel tubes containing the glass fibres. The steel tubes are hermetically sealed and, using a special gel, provide optimum for the glass fibres. The maximum number of fibres of the currently largest standard OPPC is 72.

Data Corresponding to Standard OPPC

The benefits of our OPPC design

• Optimum fibre excess length. The fibre excess length realized in the production process of steel bundle cables is greatly increased through braiding
• Optimum lateral pressure behaviour thanks to specific diameter
• Waterproof thanks to the use of stainless steel loose tubes and gel
• Rugged design

OPPC Characteristics

• High crush resistance
• Hermetic seal of the optical fibres
• Loosely packed optical fibres
• Fiber elongation < 0.01 % to achieve highest reliability
• Compact configuration, up to more than 100 fibres

OPPC Tests

Overhead conductors are subjected to high electrical and mechanical stress in operation. Numerous tests are necessary in order to guarantee the operator the highest degree of reliability possible. The following represent some of these tests.

• Tensile tests on whole rope: Confirmation of the calculated breaking load and fibre length reserve and attenuation stability up to a defined load.
• Tests to determine the lateral pressure behaviour: The OPPC's are subjected to an agreed lateral pressure and the change in attenuation measured. Once the test is finished the metal buffered fibres are removed from the cover and the surface inspected visually.
• Lightning strike tests: Pulse overshoots of up to 100 kA and long-time strikes up to 100 AS are applied to ropes.
• Vibration tests: Overhead conductors can be excited by laminar flows to high-frequency vibrations which destroy the ropes, depending on duration and intensity. Vibration test benches are used to determine the self-behaviour of the ropes and establish the type and position of the vibration dampers.

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