Reliable cable splices under harmonic conditions
Harmonics are voltage or current waveforms with frequencies that are integer multiples of the fundamental frequency. They are often introduced by non-linear loads such as variable speed drives, rectifiers, and electronic devices.
The impact of harmonics on cable splices
Harmonics can lead to several issues in medium-voltage (MV) cable systems, including:
- Increased heating: harmonics can cause excessive heating in cable conductors and splices. This may lead to insulation degradation and reduce the cable’s lifespan.
- Partial discharges: harmonics increase the likelihood of partial discharges within cable splices. These discharges can erode insulation materials and cause failures.
- Thermal stress: harmonics worsen thermal stress in cable splices. When combined with factors like high soil thermal resistivity, they can raise temperatures well above normal operating levels.
Lovink’s solution: innovative cable splices
Lovink addresses the challenges posed by harmonics with innovative cable splice technology, offering:
- Self-healing insulation: LoviSil® splices utilize liquid silicone that can self-heal after partial discharges, maintaining the integrity of the splice and extending its service life.
- Hydrophobic properties: the fluid silicone insulation is hydrophobic, forming a perfect seal against moisture ingress, which is crucial in preventing insulation degradation in damp conditions.
- Enhanced dielectric strength: LoviSil® provides superior dielectric properties, reducing the likelihood of partial discharges and enhancing the overall reliability of the cable splice.
- Thermal stability: designed to withstand elevated temperatures, LoviSil® splices maintain their performance even under the thermal stress induced by harmonic currents.
