15KV 630KVA AC Oil Immersed Welding Distribution Transformer

15KV 630KVA AC Oil Immersed Welding Distribution Transformer

 

development history

Transformer oil is a petroleum based liquid that has the potential for combustion and has environmental drawbacks. However, due to the excellent performance and low price of transformer oil, the vast majority of power transformers still use transformer oil as insulation and cooling medium.

At the end of the 19th century, transformers began to use transformer oil as insulation and cooling medium, leading to the emergence of oil immersed transformers. In addition to abundant natural storage and low prices, transformer oil has been widely used due to its following characteristics.

1) When used in conjunction with fiber materials, the insulation performance is good, which can reduce insulation distance and reduce costs.

2) Transformer oil has low viscosity and good heat transfer performance.

3) It can effectively protect the iron core and winding from the influence of moisture in the air.

4) Protect insulation paper and cardboard from the action of oxygen, reduce the aging of insulation materials, and extend the service life of transformers.

Except for some special purpose small and medium-sized transformers and gas transformers, the vast majority of large and medium-sized transformers still use transformer oil as a cooling and insulation medium.

The insulation of transformers impregnated with transformer oil has a heat resistance grade of A and a long-term operating temperature of 105 ℃.

Performance characteristics

a. The low-voltage winding of oil immersed transformers generally adopts a cylindrical structure with copper foil winding, except for small capacity copper wires; The high-voltage winding adopts a multi-layer cylindrical structure, ensuring a balanced distribution of ampere turns, low magnetic leakage, high mechanical strength, and strong short-circuit resistance.

b. The iron core and winding each adopt fastening measures, and the fastening parts such as the height and low-voltage leads of the device are equipped with self-locking anti loosening nuts. They adopt a non hanging core structure and can withstand transportation bumps.

c. The coil and iron core are vacuum dried, and the transformer oil is filtered and injected using a vacuum process to minimize moisture inside the transformer.

d. The oil tank adopts corrugated plates, which have breathing function to compensate for the volume change of oil caused by temperature changes. Therefore, this product does not have an oil storage tank, which obviously reduces the height of the transformer.

e. Due to the replacement of the oil storage tank with corrugated sheets, the transformer oil is isolated from the outside, effectively preventing the entry of oxygen and water, which can lead to a decrease in insulation performance.

f. Based on the above five performance points, it ensures that the oil immersed transformer does not require oil replacement during normal operation, greatly reducing the maintenance cost of the transformer and extending its service life.

Key selection points

Load nature

1) When there is a large number of primary or secondary loads, it is advisable to install two or more transformers. When either transformer is disconnected, the capacity of the remaining transformers can meet the electricity consumption of primary and secondary loads. 1、 The secondary load should be concentrated as much as possible and should not be too dispersed.

2) When the seasonal load capacity is large, special transformers should be installed. For example, the load of air conditioners and freezers in large civil buildings, and the load of heating electric heating.

3) When the concentrated load is large, special transformers should be installed. Such as large heating equipment, large X-ray machines, electric arc furnaces, etc.

4) When the lighting load is large or the use of a shared transformer for power and lighting seriously affects the lighting quality and bulb life, a dedicated lighting transformer can be installed. In general, power and lighting share a transformer.

Usage environment

Under normal medium conditions, oil immersed transformers or dry-type transformers can be selected, such as independent or attached Electrical substation for industrial and mining enterprises, agriculture, and independent Electrical substation for residential areas. The transformers available for selection include S8, S9, S10, SC (B) 9, SC (B) 10, etc.

 

Temperature environment

① Maintain long-term stability at a temperature of 220 ℃

② Capable of withstanding short-term operation at a temperature of 350 ℃

③ Maintain stable performance over a wide range of temperature and humidity

④ At a temperature of 250 ℃, it will not melt, flow, or support combustion

⑤ No toxic or corrosive gases will be released at a temperature of 750 ℃

Installation requirements

1. The transformer foundation track should be horizontal, and the oil conservator should have a slope of 1-1.5%.

2. Transformers should be reinforced.

3. The primary and secondary leads of the transformer should not cause stress on the bushing.

4. The transformer shell is firmly connected to the neutral point and grounding device to form a trinity 800KVA (install gas relay).

characteristic

advantage

1. Transformer oil has good insulation and thermal conductivity, while transformer oil is cheap.

2. It can solve the problem of high capacity heat dissipation and high voltage insulation in transformers.

disadvantage

1. Transformer oil has flammability and may burn and explode when encountering flames

2. Transformer oil is harmful to human health

3. Transformer oil needs to be regularly inspected

4. The sealing performance of oil immersed transformers is poor and should be aged, resulting in severe oil leakage in the operating site, which affects the safe operation of equipment and also affects the environment

5. The insulation level of oil-immersed transformers is low, and they are designed and manufactured according to Class A insulation

Technical Parameter

Traduction pour : Transfo H61 20KV 160kVA B2

H61 Transformer 15(20)kV 160kVA B2

Three-phase MV / LV distribution transformer with MV and LV windings in wound copper power P = 160KVA
- Compliance: NFC 52 100 - 52 112 and 52 113 standard or equivalent in substance
- Natural cooling: ONAN
- MV voltage adjustment: by switch off +/- 5% in five (5) positions
- Type: on post H61
- Nominal power: 160KVA
- Primary rated voltage: 20,000V ± 5%
- Secondary voltage: 410V off-load between phases / 240V between phase and neutral
- Frequency: 50Hz
- Short-circuit voltage: 4%
- No-load loss less than or equal to 300W
- Load loss less than or equal to 2000W
- Coupling: Dyn11 with output neutral
- MV and LV crossings: in porcelain

 

 

 

 

 

 

 

 

 

 

Q5 : Is OEM/ODM available?

A: Yes, it is! Our products can be Customized. We have design and engineer teams,we can customize products according to customers' drawing or requirements.

 

Q6 : You are manufacturer or trading company?
A: We are factory, As a 100% professional manufacturer with 20 year's manufacturer experience, we could produce products according to customers' requirements and we could also control the quality of products 100%.

 

Q7 : Can the price be negotiated?

A: Yes, the price is negotiable. It can be changed according to your quantity or package

 

Q8 : How about inspection?

A: We have the whole inspection system from raw material to end products include temperature rise test,salt spraying test conductor type test,mechanical life test.

 

Q9 : What is payment terms?

A: T.T, Paypal,Western Union,Alibaba trade assurance and L/C is acceptable. 30% T/T in advance ,70% balance before shipment.

 

Q10 : What is the service offered by company?

A: We have the professional engineer team which can design and develop the mold to arrive different customer requirement.

We also have the sales team to offer good service from pre-sale to after-sale.

 

 

This product is usually customized.
We are a manufacturer and have a professional technical department that can design and provide solutions according to customer needs.
Please click on the button below to send us the information, and our sales personnel will contact you to provide you with the design drawings

 

Here are our customer examples for your reference

African clients

Data Sheet N° 1-A: Transformer H61 20kV/400V of 100kVA

DESIGNATIONS	UNITS	SPECIFIC DATA	CANDIDATE DATA
Maker		To be indicated
Reference standard		IEC 60076
Type		Phase
Vat		Hermetic
Execution		Tropicalized
Dielectric		PCB-free oil
Installation		On pole
Operating ambient temperature	°C	45
Rated frequency	Hz	50
Rated power	Kva	100
Rated primary voltage	Kv	20
Isolation level assigned to primary school	Kv	24
Number of phases in primary school		03
Secondary voltage	V	400/230
Voltage adjustment range on the M side when unladen	%	±2.5
Coupling		DYn11
Short circuit voltage	%	4 – 4.5
Neutral sized for one load	%	100
Maximum vacuum losses	W	230 - 460
Losses due to Maxi load	W	1450 - 2350
Maximum steady-state oil temperature	°C	55
Maximum temperature of the windings in steady state	°C	60
Winding material		Electrolytic copper
Maximum noise level	Db	52
50Hz industrial frequency hold, 1 min	Kv	50 – 70
Shock wave resistance (1.2/50 micros)	Kv	125 - 170
Cooling		ONAN
Nameplate		01
Grounding connection		01
Dimensions Height/width/depth	mm x mm x mm	1200 X 1270 X 820
Total mass of transformer including oil	Kg	700
Oil mass	Kg	160
PAINT
		Tropicalized and anti-rust
	Number	Layers
		Binder
		Colour
		Plans and technical diagrams to be provided.

 

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