The role of the stay wire insulator is to block any potential voltage from reaching the ground when a fault occurs in the medium-voltage overhead line network. When there is a need for the operation of the stay wire insulator in line, we are already talking about a major and dangerous fault. Both a stay wire and stay wire insulator play a part in supporting the pole, therefore strong physical and mechanical strength as well as endurance are required from the insulator.
Porcelain stay wire insulators have been around for decades, but they also have certain challenging features. Porcelain as a material is not shockproof and breaks easily when dropped. The porcelain insulator is also quite heavy, which may cause difficulties in handling the installation phase of the product.
In our pursuit of enhanced ease of installation and safety, we are proud to introduce a pioneering
stay wire insulator SDI69 made from a remarkably robust and durable material, polymer. Its specified
minimum breaking load of 130 kN is even higher than porcelain or composite stay wire insulator, in addition the polymeric insulator is
highly resistant and withstands electrical stress well. Polymeric stay wire insulator is also
weatherproof and UV resistant.
Strong but lightweight structure
In addition to the polymeric stay wire insulator's innovative design and robust structure, we have prioritized the connection between the stay wire and the stay wire insulator is very strong and durable. Thanks to the design, the loops of the stay wire can be installed inside each other, which contributes to the strength of the joint. The insulator is shockproof and exceptionally lightweight, only 0,8 kg. The insulator is also easy to handle and install. The durability expectancy of a polymeric stay wire insulator is the entire life of the overhead power line.
The polymeric stay wire insulator is suitable for 25 - 70 mm² stay wire. It is possible to order the insulator pre-attached to the stay wire kit, making it very easy and safe to install. The kit includes all accessories for the stay wire installation, and thanks to pre-cut stay wire, there is no need to handle heavy stay wires from the reel on the field. The length of the stay wire means the distance between the pole and the stay wire fitting end including some spares for the installation. Kits with lock have some spare to allow the top end of the wire to be tied twice around the pole.
The polymeric stay wire insulator is designed and manufactured in Finland. The delivery capability of the product is excellent. The new polymeric stay wire insulator SDI69 replaces the porcelain stay wire insulator SDI4.5 and composite stay wire insulator SDI70.24.
New stay wire insulator SDI69
- Suitable for 25 - 70 mm² stay wire.
- Withstands voltage loads very well:
- highest system voltage 24 kV
- wet power frequency withstand voltage ≥ 24 kV
- dry lightning impulse withstand voltage ≥ 95 kV.
- Strong structure, but lightweight:
- strength, SMFL up to 130 kN
- shockproof
- weatherproof
- weight only 0,8 kg.
- Creepage distance 160 mm.
- Length 278 mm, width 133 mm and height 133 mm.
- Conforms with standard SFS 3741-H24.
Check how to install stay wire