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35kV and Below SC(B)/SG(B) Series

  • Structural features

    1.Iron core
    Made up of high quality cold rolled silicon steel sheet that is for electric engineering
    2.Low voltage winding
    Made up of a whole copper foil coil
    3.High voltage winding
    Made up of sectional type vacuum casting double glass-fiber covered coils
    4.Low voltage terminal
    5.High voltage terminal
    Variable wiring mode, which is convenient for installation
    6.Resilient pad
    Avoid mechanical resonance, and reduce noise
    7.Clamp and trolley
    The wheel of trolley can rotates to 90°
    It is convenient for vertical and horizontal movement.
    8.Packing type resin insulation
    With advantages of damp proof, anti-damp and hot, flame-retardant, and selfextinguish.

    Product characteristic

    The epoxy resin cast dry type transformer of Special T ransformer Company of Great is made with abroad advanced technology, it includes the following characteristics:
    1.Low local discharge
    As the coil is cast in vacuum state, the air bubble produced in coil can be prevented effciently, the local discharging value fully accords with relative national standard.
    2.Strong capability of lightning impact
    The lightning impact voltage that affects the insulation of transformer windings along the initial voltage distribution of windings, the foil type windings initial voltage distribution approaches to linear one, therefore, the transformer manufactured by us has good ability to resist the lightning impact.
    3.Strong ability to resist short -circuit
    The width of copper foil of LV windings that is the reactance height, LV current is supplied according to be the requirement for ampere turns balance among windings, HV/LV windings axial force caused by short circuit tends to zero.
    4.Good performance of anti-drying crack
    The transformer manufactured by us is made of packing type resin and designed into the structure of full copper oil, the coefficient of insulation material is the similar to the that of thermal expansion of copper conductor, so the coils can be prevented cracking efficiently. The transformer has been done kinds of anti-crack tests, such as cold/hot alternation test, thermal impact test, rapid aging test, etc, and the test result demonstrates that our technology can meet the requirements of service occasions like low temperature, high temperature and large range of variable temperature, as well as anti-crack after the transformer runs for a long time.
    5.Strong over-load capability
    If the transformers of same capacity whose load consumption is equal, the sectional area of copper foil will be increased correspondingly, and the volumewill be extended with the sectional area that requires more packing resin, therefore, both the thermal capacitive property of windings and short -time over load capability of transformer are quite strong.
    6.Good flame retardancy
    The transformer has visible features such as free-maintenance, moisture-proof , anti-damp and hot, flame-retardant, selfextinguishing, etc., besides, its stuffing type resin casting technology is good for environmental protection. When bum by the electric are at high temperature, it will not product any noxious gas. The superior flame retardancy is proved in the burning test. The product has good ability to adapt to environment, on the basis of European HD464 standard, it reaches the environment class E2, weather-resistant class FC2, flame-retardant class F1, it can be widely used in fields or locations where service conditions are rather atrocious such as commercial area, under ground, power plant, steamship, offshore drilling platform, etc.
    7.Low noise
    Because of special structure and design, the noise produced by transformer is reduced greatly, compared with the noise value stipulated at national Specialized Standard, its whole noise level is lower than it for more than over 10-13dB(A).
    8.Low consumption
    Compared with"8" character type products, SCB9 series has better economic benefit, its total consumption is reduced for 10~15% in average

    T emperature control and temperature thermometer system

    1.Safety running and service life of dry type transformer is largely determined by safety and reliability of transformer's winding insulation. When the temperaturerise of winding conductor exceeds its insulation withstand range, it will destroy the insulation, it is one of the main cause of transformer fault.
    2.The temperature control and temperature thermometer system of our products are accord with JB/T7631.

    Common type temperature controller

    1.Temperature control system measures and get the temperature signal by 3 PT100 temperature-measuring elements, which is pre buried in the temperature hole at the top of low voltage coil, it controls the air cooling fan's running, and gives over-temperature alarm signal or even over-temperature tripping signal according to the winding temperature.

    2.Main functions
    a.When it is natural air cooling (AN), if the winding temperature exceeds 130℃, it will give alarm, and output tripping signal if exceeds 150℃.
    b.When it is forced air cooling (AF), if the winding temperature exceeds 100℃, the system will start the fan automatically; when the temperature is lower than 80℃, the system will stop the fan automatically; if the temperature rises continuously and exceed 130℃ , it will output ver-temperature alarming signal. When the temperature is beyond 150℃, it will input over-temperature tripping signal to the secondary protection system.
    c.The above temperature points are set by the supporting factory, if necessary, these temperature points can be adjusted, adjusting range is ±20℃.

    3.Model of temperature controller as following:

    Microcomputer interface type temperature controller

    1.Temperature thermometer system test the temperature signal by PT100 thermistor that pre buried in low voltage winding, it can display the temperature of each winding directly, can be equipped with computer to realize remote temperature control.
    2.Main functions
    a.Serial communication (RS-485), transmission distance can be as far as 1200m. We can provide data control software under Windows operating system.
    b.Output 3 circuit of 4-20mA standard current signal (4mA corresponding to 0℃; 20mA corresponding to 200℃ ). It can connect with the secondary and tertius instrument and computer A/D board directly, transmission distance is far than 500m.

    Main performance index of temperature controller

    1.Operating temperature: -10℃~+55℃
    2.Operating power supply: AC220V±10%, 50Hz
    3.Measuring range: 0~200C
    4.Contact capacity of output signal: AC220V, 3A
  • SC(B)12-30~2500/10 type cast resin dry-type power transformer main T echnical parameters

    SC(B)10-30~2500/10type cast resin dry-type power transformer main T echnical parameters

    Trolley size

    Size diagram of L V connecting terminal

  • Overload capability

    Overload capability of the transformer is relative to factors like transformer structure, ambient temperature, initial load and so on. Overload capability of our transformer is determined after accurate calculation, see the following curve for reference.

    Note: The outline dimensions and track gauge dimensions covered in the catalog are only for reference. Welcome to contact us for accurate dimensions

    Refer to the following data list for overload capability of our transformer (Highest ambient temperature +45℃)

    Principle diagram of temperature control and temperature thermometer system as following:

    Note: temperature system can obtain power supply from the transformer or from outside power source

    Note: The outline dimensions and track gauge dimensions covered in the catalog are only for reference. Welcome to contact us for accurate dimensions