20kV - 3500kVA , 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.
Application: for power distribution system and large industrial
Standards: IEC 60076
Parameters: Rated Voltage: 20kV~22kV.
Rated Capacity: 30-20000kVA.
· Rated capacity: 800~20000kVA
· High voltage: 20/22kV
· Low voltage: 0.4kV
· Low loss
· Compared with normal oil immersed power transformer has no oil
storage box and adopts the corrugations on the oil tank as its
· Oil tank is made by fine cold-rolled steel on an exclusive
· Corrugations can expand or contract according to the change of
· Thus the inner space of transformer can be isolated from the air
· which can reduce the aging speed of oil and prevent the
insulation materials from damping
· Oil-immersed transformer possesses a reliable operation and is
free from maintenance
The transformer shall be designed for a rated frequency of 50 Hz ±
The under frequency condition may be sustained for 30 min and the
over frequency sustained for
Ability to withstand abnormal electrical conditions/loadings
Not withstanding the over current limits tabulated in IEC 60076-5,
the transformer with the standard minimum percentage impedances
given in of this specification, shall be capable of withstanding
the thermal, mechanical and other effects using the following
criteria for calculating the short circuit withstand condition:
a) Pre-fault voltage of 1.1Un;
b) Source impedance shall be assumed to be infinite;
c) Fault duration of 2s
d) The inner winding shall be designed to withstand the free
buckling criteria. However, the specific stress (σaverage) of the
inner winding shall not exceed 50% of the copper conductor yield
strength. When ever a reasonable application of Epoxy Bounded CTC
is possible, this would be the preferred solution.
e) The yield strength that shall apply to the conductor of the
outer winding shall be 80% of the copper conductor yield strength.
f) All material used for winding cylinders shall be pre-dried and
pre-impregnated with oil prior to use.
g) The blocks which are used to apply the axial compression shall
be pinned to the clamping system.
|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||34110|
|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||7320|