Sihui Oil Immersed Transformer

Service Conditions

Ambient air temperature: maximum +40℃, minimum -45℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requriments).

The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

The maximum wind speed does not exceed 34m/s.

Eerthquake intensity does not exceed 8 degree.

There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

Technical Parameters

Rated frequency is 50Hz or 60Hz

Rated primary current: 10~4000 A

Rated secondary current: 1, 2 or 5 A

Rated output: 10~60VA

Instrument security factor (FS) for metering cores: 5 or 10

Accuracy limit factor: 10, 15, 20, 30, 40, 50 or 60

Accuracy class for metering cores: 0.2, 0.2S, 0.5, 0.5S, 1 or 0.3, 0.6, 1.2

Accuracy class for protection cores: 5P, 10P, PR, PX, TPS, TPX, TPY, TPZ or C10, C20, C50, C100, C200, C400, C800

Rated frequency: 50Hz or 60Hz

Ambient air temperature: -45 ℃/+40 ℃

Altitude: ＜1000m, if need to design exceed 1000m, please declare in the order.

Rated short-time thermal current: up to 50 kA, 3s; rated dynamic current: up to 125 kA (the actual data shall be corresponding with primary current).

Arcing distance and creepage distance of outer insulation please see table 1.

Table 1

Insulation requirements for the primaries please see table 2.

Table 2

Mechanical requirements for the primary terminals please see table 3.

Table 3

Dimensions of the Current Transformers

The outline and installation dimensions please see drawing 1~2, and the dimensions of the primary termanils please see table 4~5.

Drawing 1                                                      Drawing 2

1 Oil viewing window   2 Primary terminals   3 Porcelain isolator

4 Earthing Terminal   5 Secondary terminals box  6 Nameplate

Table 4

Notes: There may be any change of the dimensions for the current transformers because of renewing, the clients must basis on the updated drawings.