33 kV Oil - Immersed Transformer, Three Phases, Two Winding, Power
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, tap changing equipment and supplementary cooling
equipment shall comply with the values stated in Table 1 — Audible
sound levels for oil-immersed power transformers and be verified in
accordance with IEC 60076-10.
The transformer shall be designed to meet the dBA noise level
specified in schedule A of an enquiry document.
Table 1 — Audible sound levels for oil-immersed power transformers
Equivalent two-winding transformer rating (MVA)
|Average Sound Level, (dBA)|
Primary voltage 66kV
|Primary voltage greater than 66kV|
For ONAF ratings, the sound levels are with the auxiliary cooling
equipment in operation .
|I Basic Information |
|1.01||Type Designation|| ||PEO-S-500/33/0.433|
|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%|
|2.09||Vector Group|| ||Dyn11|
|2.13||Load Loss (@75℃)||W||6960|
|2.14||Max. Ambient Temperature||℃||40℃|
|Top oil temperature rise||K||60|
|Winding temperature rise||K||65|
|2.15||Impulse Withstand Voltage||(HV/LV)|
|2.16||Power Frequency Withstand Voltage||(HV/LV)|
|2.17||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|
|3.04||Tap-changer|| ||Off-load tap-changer|
|3.05||Pressure relief valve|| ||Yes|
|3.06||HV&LV Cable Box & Extension Busbar|| ||Yes|
|3.07||Bushing|| ||Yes, Porcelain Bushing|
|3.08||Oil temperature thermometer|| ||Yes|
|3.09||Oil Conservator|| ||N/A, Hermetiacally-sealed tank|
|3.10||Terminal box|| ||Yes|
|3.11||Oil-level indicator|| ||Yes|
|3.12||De-hydrating breather|| ||N/A|
|3.13||Cooling Radiator|| ||Corrugated Fin|
|3.14||Current Transformer|| ||N/A|
|3.15||Lightning Arrester|| ||N/A|
|IV OTHERS |