Nacrt

Bushings 20 kV for montage outdoor/indoor (3 pcs)Item 2.Technical specificationRequirementsOffered Requirements

Type:

-

Nominal Voltage:

24 kV

Rated impulse overvoltage withstand on dry conditions:

125 kV

Temporary short time overvoltage in wet conditions:

50 kV

Nominal frequency:

50 Hz

Materials:

Porcelain C 120, according to IEC 60672-3/Silicon IEC 62231

Sealant:

Portland cement

Overall height of the insulator:

305 mm

Minimum creepage distance:

380 mm

minimum breaking force:

8000 N

minimum torsion torque:

0,8 kNm

Fitting:

Cast iron, hot zinc

Holes for mounting insulator

-Hole numbers:2-axial hole span:240mm-hole diameter:M16

-hole numbers:4-axial hole span:76mm-hole diameter: M12

Standards:

IEC 60272

Tests:

According to IEC 60168

Technical documents with offer:

-detailed dimensions drawing-Complete protocols of type test (not older than 10 years)*

Technical documents with equipment delivery:

protocols of routine tests

2. BUSHINGS 20 kVGeneral

Bushings for passage of flat busbars, inner wall has a conductive layer galvanic linked with busbars. The insulators are equipped with aluminum plates that are used as a carrier of busbars. The plates are secured from falling with clamping rings, which also used as electrical connection of the inner surface and busbars.

* - Type test protocols should be issued by accredited laboratories. Laboratory accreditation should be in accordance with ISO / IEC 17025 and should be issued by the national accreditations. The same must be submitted with the offer.- ISO 9001 should be submitted with offer

Note: The supplier is required to completely fulfill each item of these technical specifications, in otherwise the offer will be rejected as incomplete.