Standard - Cast Resin Transformer
SGB-SMIT Group is able to deliver Cast Resin Transformers (from production sites in Germany, Malaysia and the USA) with capacities up to 25 MVA and series voltages up to 36 kV. Our offer includes converter transformers, distribution transformers and special transformers. With more than 30 years experience in the construction of cast resin transformers, SGB-SMIT Group has worldwide expertise, and this is expressed in remarkably high quality coefficients such as mean time between failures (MTBF) of over 2,400 years.
Products Details
The product range in the standard segment covers capacities from 50 kVA up to including 3,150 kVA at at primary voltages up to including 36 kV.
Proceeding from a selection of basic transformer designs the transformers can be adapted or supplemented most efficiently to the individual requests. The proven designs are available in various loss ranges.
- Vibration resistant execution
- Shielding winding
- PT 100 thermo sensor
- Current transformer (neutral point)
- Transformer bearing
- Spherical-head connector
- Adaption of external dimensions
- Installation above sea > 1000 m
- Silicone-free
Guarantee
- up to 5 years
Technical parameters
- According to EN 60076
- HV: insulation class F
- LV: insulation class F
- Fire class F1
- Environmental class E2
- Climatic class C2
Transformers which are part of a semiconductor inverter installation must be specially dimensioned. This also applies for use in power supply with increased harmonics-strain, for example, in office blocks or computer centres. Here single-phase loads with power supply units cause a great deal of harmonics.
In the operating-rated current or in the transformer’s rated power, the true values of the fundamental wave and the harmonics are to be included. (Radix from quadratric additions of the values.) This means that the effective capacity decreases in accordance with the harmonics ratio. (With a B6 wiring ca.5%.) At the same time when operating converters, load losses increase due to the frequency-dependance of the additional losses. Additional losses occur both through eddy currents and through flux leakage in the windings and iron pieces.
With converter transformers special attention must be paid so that the amount of additional losses at 50 Hz (see test certificate) is as low as possible (reduced additional losses). With a transformer with normal additional losses it can lead to excessively high heating when operating with loads that cause harmonics. This then affects the service life.
With the SGB calculation model, both additional losses and thermal strain of the winding are ascertained. Heating is adopted in such a way that the converter can be dependably supplied.
SGB manufactures converter transformers for 6-/12-/18- und 24-pulse operations. Thereby moulded, low-vibration, high voltage layer winding with regard to short cycles of operation, quick variable loads, short-time overloads and commutation processes is particularly suitable. This is especially important with inverters with a voltage immediate circuit.
Technical Information
- General technical data
- Core
- high voltage coils
- low voltage coils
- Fans
- temperature monitoring
- electrical conncetions
- energy efficiency / evaluation of losses
- options
- Installation conditions
- Minimum distance
- Routine test schedule - tests
- type test schedule - tests
- transformer test report
- quality assurance plan
- ventilation
- noises
- EMC electromagnetic compliance
- earthing
- parallel operation
- Invitation to tender specimen
- Standards and instructions
- measurement and weights
- constructional planning principles
- possibilities for installation
- environmental conditions
- fire performance
- cool air temperature
- overload capacityservice life
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