6.6 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 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.
Clearances in air
When assembled with connections as in service, electrical
clearances in air shall be adequate to withstand the assigned
impulse withstand test voltages. This shall be demonstrated by the
impulse voltage routine tests specified in 5.2 Test by the
Manufacturer, during the performance of which all relevant fittings
shall be in position as for service conditions.
For three-winding transformers, the tertiary bushings shall have
the maximum practicable spacing between phases but shall be not
less than 580 mm metal-to-metal. Note the minimum requirements for
tertiary bushings and bushings for transformers of 5 MVA and above
in,which also requires a minimum phase-to-phase clearance of not
less than 700 mm (centre to centre of the air terminals).
|Rated H.V.:||6.6 kV, ±2×2.5%|
|Notes: The above specifications may be customized according to
|Features & Advantages|
|1. Low loss, low noise and high reliability.|
|2. Excellent dynamic thermal stability and high over-load capacity.|
|3. Simulation analysis was carried out for the core mould design,
thus to greatly reduce noise level. Simulated lightning impulse
wave process was carried out for HV winding mould design, thus to
greatly improve product's anti-lightning impulse capability.|