400kV Polymer Substation Insulator With Flange

What does 400kV substation mean?

A 400kV substation is designed to step up or step down electrical voltage levels, monitor transmission performance, and ensure the safety of power systems.

Are all substations high-voltage?

There are three fundamental types of substations: Transmission substations (high voltage), which link the power generation sources to regions receiving electricity. Sub-transmission substations (medium voltage) - these link transmission lines within the same region together.

400kV refers to 400 kilovolts (400,000 volts), an ultra-high voltage level used in power systems for long-distance, high-capacity power transmission.

Core Meaning:
Numerical Definition: 1kV = 1000V, therefore 400kV = 400,000 volts.

Voltage Level: Belongs to the ultra-high voltage (EHV) category (usually referring to the 330kV-750kV range), between 220kV and 500kV/750kV.

Writing Standard: The standard symbol is kV (k lowercase, V uppercase), representing "kilovolt".

Main Application Scenarios:

Regional Backbone Networks: Widely used in national-level power transmission backbone networks in Europe, India, Africa, and some Asian countries to achieve inter-provincial or inter-national power interconnection.

DC Transmission: In China, ±400kV specifically refers to the voltage level of high-voltage direct current (HVDC) transmission, a typical example being the Qinghai-Tibet power grid interconnection project (Chaila DC system), used to solve the challenges of high-altitude, long-distance power transmission.

Equipment Identification: Commonly found on the design rated voltage of 400kV substations, converter stations, and transmission lines. Special Note: The mainstream AC transmission levels in China are 500kV and 750kV; there is no standard 400kV AC level. If "400kV" is seen in a Chinese context, it usually specifically refers to a DC transmission system (such as ±400kV) or an imported/specific foreign-related engineering project.

 

Our factory & quipment

 

Customized Size Available

500kV(100mm diameter)

220kV(70mm diameter)

35kV(38mm diameter)

Height:4174±50mm

Min Dry Arcing Distance:3885mm

Min Creepage Dsitance:13020mm

Diameter of the Rod: φ90mm

Number of sheds:91

1. End fitting Material:Hot Dip Galvanized Steel

2. Mean coating thickness(minimum):86μm

3. Core Material:Epoxy&Glass Fiber

4. Weather material:HTV silicone

5. Color:Gray

Max Design Cantilever Load(MDCL):4kN

Specified Cantilever Load(SCL):8kN

Standard:IEC 61952

Rated Voltage:400kV

Power Frequency Withstand Voltage (Dry/Wet):850kV/800kV

Lightining Impulse Withstand Voltage:1550kV

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