Portable Earthing Kits Installed With Insulating Sticks To High Voltage Overhead Lines
Published 23 Jan 2018
- Images Courtesy: Murray Jones (Specialist Trainer, Transmission Lines & Rigging)
- Application: Portable Earthing Overhead Line Distribution Networks
- Voltage: 275kV Extra High Voltage (EHV)Â
- Uploaded by Chris Dodds – reading time 3 minutes
Portable Earthing
In this high-wire act the overhead linesmen are shown using Portable Earthing Kits on 275kV overhead power distribution and transmission lines – the portable earths are installed and connected using Insulating Sticks.
♦ See Portable Earthing – Short Circuiting Kits For HV Substations & Overhead Lines
The bottom phases are earthed using high voltage portable earthing kits by the Linesmen.
CATU Electrical – High Voltage Electrical Safety Equipment
Using insulating sticks the portable earthing kits are positioned and clamped to the overhead line by the Linesmen.
Insulating Matting | Insulating Gloves | Substation Safety | Arc Flash Clothing  MV HV EHV Electrical Safety Equipment Suppliers & Stockists
Electrical Safety For Overhead Lines & Substations
Thorne & Derrick International are the UK’s leading stockist and supplier of the CATU Electrical range of Electrical Safety Equipment – protecting utility workers including jointers, splicers and linesmen exposed to the risk of electrocution and arc flash hazards.
A complete range of HV Sticks are available for use on 33kV/40kV, 66kV/90kV and 275/400kV underground cables and overhead lines with a selection of short circuiting and portable earthing kits and associated high voltage earth clamps for substation busbars or line conductors. Insulating sticks are available as telescopic and extendable suitable for outdoor use or supplied as fixed length sticks.
The following tables provides an overview of Portable Earthing Kits available from CATU Electrical, The Electrical Safety Specialists – comprehensive range of earthing clamps are available for MV-HV substation, power cables and overhead conductors.
| Medium & High Voltage Substation Portable Earthing Kits | ||||
| CATU Part Reference |  Earth Kit Rating (kA/1 s) |  Installation on Fixed Points |  Composition |  Connection Kit |
|  CATU MT-1910 | 20kA/1 s |  Ø 20 mm MT-2951 range | 3 Earth clamps CATU MT-1911-E 1 MT-1911 |  3 cables 95 mm2 1 earth cable 35 mm2 |
| CATU MT-1920 | 30kA/1 s |  Ø 25 mm MT-3951 range | 3 Earth clamps CATU MT-1921-E 1 MT-1921 |  3 cables 150 mm2 1 earth cable 50 mm2 |
♦ Portable earthing kits used with CATU CF-5-40-E insulating stick (up to 40kV) – generally used to provide short circuiting and earthing on power systems operating at 11kV/33kV.
Portable Earthing & Short Circuiting Kits
| Portable Earthing Kits Overhead Line Conductors & Cables | ||||
| CATU Part Reference |  Earth Kit Rating (kA/1 s) |  Installation on Fixed Points | Composition | Connection Kit |
| CATU MT-5805 | 20kA/1 s |  Ø 5-35 16-40 5-40 |  3 Earth clamps CATU MT-815-C 1 MT-840/1 | 3 cables 95 mm2 1 earth cable 35 mm2 |
| CATU MT-8408 | 12.5kA/1 s |  Ø 18-33 |  3 Earth clamps CATU MT-814/3 1 MT-840/1 | 3 cables 70 mm2 1 earth cable 35 mm2 |
| CATU MT-9801 | 10kA/1 s |  Ø 5-16 0-16 Ø 5-28 |  3 Earth clamps MT-817-C 3 clamps CATU MT-814/2 1 MT-840/1 | 3 cables 50 mm2 1 earth cable 25 mm2 |
♦ Portable earthing kits used with CATU CE-4-21-C insulating stick (up to 90kV) – – generally used to provide short circuiting and earthing on power systems up to 66kV.
All following images courtesy: Murray Jones.
Tower transfer to allow for structural work to high voltage overhead lines
Hanging 600mm rollers to tension string OPGW using existing earth wire as the draw wire
400kV live line insulator wash
Overhead Line Equipment Distributed by Thorne & Derrick
Further Reading
-
CATU – Electrical Safety
Size: 14.74 MB
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Short Circuit & Portable Earthing Kits (Substation & Overhead Lines) – 2018 Brochure
Size: 160.14 KB
