General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Dull silver metal cap & locking pin; clear glass shell; ceramic liner.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

N/A

Width

N/A

Height

20.0 cm

Thickness

N/A

Weight

N/A

Diameter

28.3 cm

Volume

N/A

Lexicon

Group

Energy-electric

Category

Transmission & distribution

Sub-Category

N/A

Manufacturer

AKA

Sediver

Country

China

State/Province

Unknown

City

Shanghai

Context

Country

Canada

State/Province

Ontario

Period

This type made c. 2008, and used until 2010. This example appears new/unused.

Canada

The [lot] donation includes insulators, dampers, conductors, a preform rod, a sign, and personal gear from a Hydro One transmission station. It shows choices made by Hydro One, the typical equipment used at the beginning of the 21st c. on high voltage lines in Ontario. The artifacts also represent diversity and the longevity of manufacturers of electrical equipment and globalization of the markets. [Ref. 1]

Function

Used in electrical power transmission to separate conductors to prevent a flow of current between them or to other objects.

Technical

Insulators are designed to be used with lines of a specific voltage: in Ontario, the voltage is usually 115kV; 230 kV and 500 kV. The insulators are assembled in sequences; the number of insulators in a sequence indicates the kV of the transmission line. Iron caps and locking keys allow attaching one insulator to another. Insulators such as this example would be used on 115kV line. Glass insulators are once more gaining popularity. Since the late 1980s, polymeric insulators have been promoted by manufacturers as a superior technology. Hydro One is now going back to glass insulators. Even though they are much heavier then polymeric insulators, glass insulators are more durable and have lower rate of failure. Moreover, to diagnose a potential failure of a polymeric insulator, the lineman has to climb to the top of the pylon and use testing equipment. Glass insulators break to pieces and linemen can see the problem from the ground. This saves time, is more cost efficient and safer. Many insulators suffer from critical surface cracks. The Sediver glass is pre-stressed under very high pressure to ensure that the formation of the cracks is minimized. Dielectric (non-conducting) shells are made from very structurally pure glass and are durable and resilient to environmental wear. The cap & pin are also made from dielectric materials; their long term mechanical performance depends on their ability to resist the internal cracks due to stress in service. The electrical performance of these materials is similarly dependant on their structural consistency. Internal fracture is the starting point of failure due to electrical stress concentration.

Area Notes

Unknown

Details

Markings

"[ 3 unidentified symbols]/ SEDIVER 05/ M&E50000lb K/ 25 [illegible]0016 TEST" cast in raised print on one side of cap; "057083/ 222 KN M&E TEST/ 250" cast on opposite side. "R J" crudely incised on top of cap. "1 05" and "1" incised in glass shell.

Missing

Appears complete.

Finish

Dull silver metal cap & locking pin; clear glass shell; ceramic liner.

Decoration

N/A