6.6kV - 3000kVA , Oil - Immersed Transformer, Three Phases, Two
Winding, Power Distribution
Oil-immersed type transformer features low noise, low loss,
rational structure, high quality material, scientific design,
strict production technology and advanced test method. The product
also has the following additional advantages:
1. High mechanic strength, great anti-short circuit capability,
excellent anti-lightning impulse capability and high reliability.
All these performance indexes rank first in the industry in China.
2. Excellent overload capability, capable of continuously working
under 110% rated load.
3. Low loss, energy-saving, economic and maintenance free.
4. Nice appearance, small size, less installation space occupation
and low engineering cost.
5. Each performance index and technical specification excels that
specified in China GB, international IEC and industrial standards.
6. Hermetically sealed corrugated tank structure is adopted, thus
to effectively prevent air corrosion to the oil and prolong service
lifetime of the transformer.
The core is manufactured with high quality cold rolled
grain-oriented silicon steel of high magnetic conductivity, and 45°
Mitring and steps overlapping structure is used for core
production, thus to effectively reduce no-load loss and no-load
HV winding is manufactured with high quality copper conductor,
adopting optimized structure to improve electric distribution.
Lightning impulse wave process is carried out for calculation and
analysis, thus to improve transformer's anti-lightning impulse
LV winding is manufactured with high quality foil conductor, so the
ampere-turn balance is excellent and the transverse magnetic flux
leakage is low. The anti-short circuit capability is thus greatly
improved. Oil conduit is rationally designed in the windings to
increase winding's heat dispersion surface, effectively reduce
temperature and improve transformer's overload capability.
The transformer adopts class-A insulation. The HV and LV windings
are arranged in concentric way. Between the windings are
oil-clapboard insulation structure built with paper cylinder and
small oil conduit.
The tank is jointed with high-quality steel. Rust-removing and
phosphorization processes are carried out for the tank surface,
then the surface is coated with FVC anti- erosion paint, thus to
effectively prevent grease pollution and chemical erosion. The
appearance is nice and harmonic with the environment. The whole
structure is easy for installation and maintenance. It can be
widely applied in outdoor environment and under harsh conditions.
The transformer is equipped with HV & LV bushings, oil drain
valve, earthing bolt, lifting board, rating plate, pressure relief
valve and other accessories. Transformers of over 800KVA power are
equipped with signaling thermometer and gas relay.
Main measures for preventing oil leakage:
1. Superior large-width steel plate is selected as material and no
vertical joins on the tank wall.
2. All sealing flanges are products of finish machining, thus to
ensure components' flatness and cleanness. Therefore, the sealing
parts have very long service lifetime.
3. Dual-sealing structure is adopted for large and medium size
tank, thus to further ensure tank rim from oil leakage.
4. Advanced technology is adopted during protective welding, thus
fully ensuring the welding quality. X-ray leakage detection is
carried out for each welding seam.
5. All main components and parts (for example, bushing, radiator,
sealing parts, butterfly valve and flap door) are purchased from
the famous manufacturers recognized and certified by authority.
6. Superior sealing part and nitrile rubber are adopted for sealing
process. The nitrile rubber is a type of oil-resistant
high-elasticity product that has a reputation as "sealing expert".
Ratings and operating conditions
The values of rated power specified in Schedule A of an enquiry
document are the continuous ratings, in MVA, at which each of the
windings of the transformer can operate on all tappings at a
voltage equal to the appropriate nominal system voltage, Un,
without exceeding the temperature rise limits specified in this
specification. (The power rating of the transformer shall be 100%
throughout entire tapping range).
Where mixed-cooled transformers are specified, (see 4.21.1 Type of
cooling required and ONAN rating), the naturally-cooled rating
(ONAN) of each of the main windings shall be at least 0,70 pu of
the rated power of these windings.ONAN70/ONAF100
If a tertiary winding is specified, this shall be capable of
operating under the naturally-cooled condition at any loading up to
the rated power specified in Schedule A of an enquiry document
provided that the loading in the input winding does not exceed its
|I Basic Information |
|1.01||Type Designation|| ||PEO-S-KVA/HV/LV|
|1.02||Applicable Standards|| ||IEC 60076|
|1.03||Manufacturer|| ||Pearl Electric|
|1.04||Country of Origin|| ||China|
|II Pearl Electric Performance |
|2.05||Number of phase|| ||Three|
|2.06||Insullation Class|| ||Class A|
|2.07||Cooling Method|| ||ONAN|
|2.08||Tapping Ranging|| ||±2*2.5% on HV side|
|2.09||Vector Group|| ||Dyn11|
|2.13||Load Loss (@75℃)||W||26500|
|2.14||Max. Ambient Temperature||℃||40℃|
|2.15||Top oil temperature rise||K||60|
|2.16||Winding temperature rise||K||65|
|2.17||Impulse Withstand Voltage||(HV/LV)|
|2.18||Power Frequency Withstand Voltage||(HV/LV)|
|2.19||Rated Duration of Short Circuit||s||2|
|III Materials & Accessories |
|3.01||Core Materials|| ||Silicon Steel Sheet|
|3.02||Winding Materials|| ||Copper conductor/foil|
|3.03||Main Insulation Materials|| ||Mineral Oil|
|3.05||Pressure relief valve||pcs||Yes,with alarm and trip|
|3.06||Gas relay||pcs||Yes,with alarm and trip|
|3.07||HV&LV Cable Box & Extension Busbar||pcs||Yes|
|3.09||Oil thermometer||pcs||Yes,with alarm and trip|
|3.12||Oil Conservator||pcs||Hermetiacally-sealed tank|
|3.14||Cooling device||pcs||Corrugated fins|
|IV OTHERS |
|4.02||Total mass(with oil)||kg||6310|