Specification of the Separated Transformer (or Isolated Transformer)
1. Standard: The transformer is designed, manufactured and tested in accordance with IEC 60076 Standard.
2. Rating: The transformer is core type, dry type, natural cooled and suitable for indoor/outdoor installation.
a) Rated power [kVA] : 50 KVA
b) No. of Phase : 3
c) Rated frequency [Hz] : 50
d) Rated primary voltage / current : 380V / 75.97 A
e) Rated secondary voltage / current : 380 V / 75.97 A
f) Insulation Class : H
g) Vector group : Dyn11
h) Operation duty [%] : 100% continuous operations
3.Service condition and installation: The transformer is designed and constructed for installation and operation under the fallowing conditions
A) Altitude : Less than 1,000 meters above sea level
B) Ambient temperature : 40°C (35°C average on one day)
C) Type of cooling : AN
D) Minimum air flow at full load (with enclosure) (f3 / min) : 95
4. Technical particulars: (Technical particulars at rated voltage, current, frequency and refer temperature to 75*C)
No load current [%] : 4.45 +25%
No load losses [W] : 364 +10%
Load losses [W] : 935 +10%
Total losses [W] : 1299 +10%
Impedance voltage [%] : 3.3 +/ -15%
Efficiency at full load [%] : 97.5 - 5%
Regulation at 100 % p.f. [%] : 1.72 +25%
5. Insulation levels:
a) Induced test voltage: 2 times of rated voltage at frequency 360 Hz for 17 seconds. b)The insulation resistance between winding and each tested by megger ohm meter not less than 1,000V at ambient temperature 30 'C and relative humidity 80%
P - S Not less than 100 Meg. Ohm
P - E Not less than 100 Meg. Ohm
S - E Not less than 100 Meg. Ohm
6. Temperature Rise:
a) Average winding temperature rise above maximum ambient temperature (40 'C) carrying maximum continuous rating. Max. 125 'C
7. Transformer Construction:
a) Core: constructed of high quality, grain oriented, high permeability silicon steel and designed to withstand over exiting of 110% rated voltage without making injury to the transformer core. The steel shall be thin lamination, annealed after cutting and rolled to insure smooth surface at the edges.
b)Winding: The designed, construction and treatment of windings is give proper consideration to all service factors such as high dielectric and
mechanical strength of insulation, coil characteristics, uniform electrostatic flux distribution, prevention of corona formation. The windings shall be
impregnated with insulating vanish and dried in oven chamber.
8. Painting: All surfaces shall be thorough cleaned before painting then painted with a primer coat and then finish colour shall be standard colour. The paint shall be used for special heat, oil and weather resisting properties.
Accessories: The transformer shall be furnished with the following accessories
a) Primer and secondary with terminal connectors.
b) Lifting lugs
Jiangxi Yawei Electrical Co.,Ltd. professional custom made package substations for all over the world.This substation has 3 main compartments. There are transformer compartment, high/medium voltage switchgear compartment and low voltage switchgear compartment.HV & LV compartments are with completed function.
1. H.V.compartment has various of power supply methods when testing power supply in 1 time, it also can be installed with H.V.testing appliances to reach the demand of H.V.testing.
2.The transformer compartment can be choosed S7 ,S9,S11 or other low loss oil immersed transformer ,or dry transformer. The transformer compartment has automatic start wind cooling systems and lighting systems.
3.Low voltage compartment can be made according to users' need , it adopts fixed or assembled structure to be electrical power supply system,it has many function like light distribution ,power distribution, reactive power ,electrical power testing..etc to improve the power distribution quality and satisfy the user.