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    SF6 Gas Insulation Combined Transformer CT VT PT Free – oil together Manufacturer Factory ISO9001 Combined Transformers

    PRODUCT INTRODUCTION

    The combined transformers combinate the characters of inductive voltage transformer and inductive current transformer

    PRODUCT DETAILS

    The combined transformers combinate the characters of inductive voltage transformer and inductive current transformer, and it also has the function of current transformer and voltage transformer. The insulation material is SF6 gas. The bushing of the instrument transformer is made by silicon rubber or porcelain

    The combined instrument transformer shall be suitable for measurement control and relay protection in the outdoor AC power system of nominal voltage 72.5~550kV, and frequency of 50 or 60Hz. Outline and the Installation Dimensions shown in Figure 1.

    一、Service Conditions 

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

    b. 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’ requirements)

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

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

    e. Earthquake intensity does not exceed 8 degree

    f. 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.

    二、Current Transformer And Voltage Transformer Main Technical Parameters

    Table 1

    Rate   voltage( kV)

    72.5

    126

    145

    170

    252

    363

    420

    550

    power-frequency withstand voltage (r.m.s) (kV)

    140

    230

    275

    325

    460

    510

    630

    680

    Rated lightning impulse withstand voltage (peak)   (kV)

    325

    550

    650

    750

    1050

    1175

    1425

    1550

    Rated switching impulse withstand voltage (peak)   (kV)

     

     

     

     

     

     

    950

     

    1050

     

    1175

    Rated frequency( Hz)

    50/60

    Creepage distance    mm/kV

    25~31 or more

    Insulation   level   

    E

    Ambient   air temperature

    -30/+50 special   design is available of -60℃)

    Current   transformer part

    Rated   current( A)

    100A ~ 4000A

    Rated secondary current (A)

    1A, 5A or others

    Accuracy   class        

    0.2S0.5S5P10PPXPRTPXTPYTPZ or others

    Voltage   transformer part

    Rated   primary voltage (kV)

    66/v3110/3132/3150/32203330/33803 or 500/3

    Rated   secondary voltage

    100/3100 or others

    Rated   Voltage factor

    1.5/30s1.9/8h or others

    Accuracy   class

    0.20.53P6P or others

    Standard: GB 20840.1GB 20840.2GB 20840.3 IEC 61869-1IEC 61869-2IEC 61869-3ANSI C57.13

    Table 2                                                                                                                      Unit:mm

    Rate voltage

    (kV)

    H1

    H2

    A

    B

    C

    D

    72.5

    2450

    600

    780

    540

    400

    20

    126

    2862

    960

    877

    600

    450

    24

    145

    3112

    1150

    950

    620

    450

    24

    170

    3412

    1255

    950

    620

    450

    24

    252

    4025

    2105

    1105

    800

    560

    24

    363

    4434

    2950

    1200

    860

    560

    24

    420

    5324

    3350

    1200

    860

    600

    24

    550

    6210

    4380

    1450

    980

    900

    28

     

     

    三、Outline and the Installation Dimensions

     

     

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