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Stable Operation Oil Immersed Distribution Transformer 20 KV - 3500 KVA

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Good quality Oil Immersed Transformer for sales
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Stable Operation Oil Immersed Distribution Transformer 20 KV - 3500 KVA

China Stable Operation Oil Immersed Distribution Transformer 20 KV - 3500 KVA supplier

Large Image :  Stable Operation Oil Immersed Distribution Transformer 20 KV - 3500 KVA

Product Details:

Place of Origin: China
Brand Name: Pearl Electric Co.,Ltd.
Certification: KEMA, CE, CCC, ISO9001
Model Number: PEO-S, S9~13

Payment & Shipping Terms:

Minimum Order Quantity: 1 unit
Price: USD/RMB
Packaging Details: Seaworthy wooden packing
Delivery Time: 35~50days ex-work
Payment Terms: T/T, L/C
Supply Ability: 8000 units per year
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Detailed Product Description
Capacity: 3500kVA Or Customized Rated H. V.: 20kv Or Customized
Rated L. V.: 0.433kv Or Customized Vector Group: Dyn11 Or Customized
Impedence: 6% Or Customized Cooling: ONAN/ONAF Or Customized

20kV - 3500kVA , Oil - Immersed Transformer, Three Phases, Two Winding, Power Distribution

 

Introduction

 

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.

Core:


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 current.

HV winding:


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 capability.

LVwinding:


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.


Insulation Structure:


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.


Tank:


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.

 

Accessories:


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.

 

 

General Description:

Application: for power distribution system and large industrial enterprises, etc.

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 heat-radiation parts

· Oil tank is made by fine cold-rolled steel on an exclusive production-line

· Corrugations can expand or contract according to the change of oil volume

· 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

 

Network frequency 

 

The transformer shall be designed for a rated frequency of 50 Hz ± 2 Hz.

The under frequency condition may be sustained for 30 min and the over frequency sustained for

5 min.

 

Ability to withstand abnormal electrical conditions/loadings

 

Short-circuits

 

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.

 

 

No. Items Unit Item 1
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     
2.01 Rated Power kVA 3500
2.02 HV KV 20
2.03 LV KV 0.433
2.04 Frequency Hz 50
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
2.10 Noise level dB 60
2.11 Impedance % 4.75
2.12 No-load loss W 4120
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)
kV
75/0
2.18 Power Frequency Withstand Voltage (HV/LV)
kV
28/3
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
3.04 Tap-changer pcs Off-load tap-changer
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
3.08 Bushing pcs Porcelain Bushing
3.09 Oil thermometer pcs Yes,with alarm and trip
3.10 Terminal box pcs Yes
3.11 Oil-level indicator pcs Yes
3.12 Oil Conservator pcs Hermetiacally-sealed tank
3.13 De-hydrating breather pcs N/A
3.14 Cooling device pcs Corrugated fins
3.15 Current Transformer pcs N/A
3.16 Lightning Arrester pcs N/A
3.17 Transformer wheel pcs Yes
IV OTHERS     
4.01 Dimensions (L*W*H) mm 3220*2450*2180
4.02 Total mass(with oil) kg 7320
4.03 Colour   RAL7035

 

 

Stable Operation Oil Immersed Distribution Transformer 20 KV - 3500 KVA

Contact Details
Pearl Electric Co.,Ltd.

Contact Person: Sandy

Tel: 86-020-22626603

Send your inquiry directly to us (0 / 3000)