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Some tips about 225 kva transformer

daelim 225 kva transformer

225 kva transformer is generally used in distribution system, in this article we will introduce some tips about distribution transformers.

Pad-mounted Transformer

We can provide you single phase and three phase pad mounted transformer

Dry-type Transformer

Type:Cast resin; Rated Capacity: Up to 25MVA; Rated Voltage: Up to 36KV;

Pole Transformer

TypeCSP type Frequency: 50/60Hz; Rated Power: 5~167kva

Oil immersed transformer

Frequency: 50/60Hz Rated voltage:10kv, 20kv,30kv Rated Power: 400~2500kva

Click below for quick review of 3 phase transformer

Which cable is used on the low-voltage side of a 225 kva transformer?

Empirical formula; it can be selected according to the copper core cable per kvA1 square millimeter, then 250kvA*1=250mm2, the public (common) can be changed to 4*240mm2 copper core

Power cable, factory and mine special change can choose 3*240mm2+1*120mm2 copper core power cable.

What is the meaning and method of measuring the winding resistance of a 225 kva transformer?

Let’s first look at the consequences of transformer oil leakage:

1. Transformer oil leakage not only seriously affects the appearance, but also causes economic losses because the transformer needs to be shut down to eliminate leakage.

2. Oil leakage will seriously interfere with the operation and maintenance personnel’s monitoring and judgment of the sealing condition in the transformer oil conservator and the correctness of the indication of the oil level gauge.

3. After the oil level is lowered due to leakage, the live connectors and switches may be operated without oil insulation, which may lead to breakdown, short circuit, burnout, and even cause equipment explosion.

4. After the transformer oil leaks, the fully sealed transformer will lose its sealing state, which will easily make the oil-paper insulation suffer from the intrusion of the outside air and moisture, which will reduce the insulation performance, accelerate the aging of the insulation, and affect the safe and reliable operation of the transformer.

How to deal with transformer oil leakage, let’s take a look at the specific treatment measures in combination with the case:

The transformer valve core of a power supply company leaked oil, and most of the valve core valve stem seals failed, resulting in serious oil leakage. Due to the special working environment of the transformer, it was not allowed to stop for a long time, so it could not meet the needs of replacing new parts. The use of Soleil carbon nano-polymer material technology is a more effective way to solve the transformer oil leakage at present.

The operation steps for on-site treatment of transformer oil leakage are as follows:

(1) Clean up the oil stains on the leaking part, and polish around the leaking part to expose the primary metal color;

(2) Clean up, clean, dry, firm and rough after surface treatment;

(3) Reconcile the SD2240 material and seal the leaking parts until there is no leakage;

(4) Reconcile SD7111C material, apply it to SD2240 and metal surface, and completely solve the leakage after the material is cured;

(5) The surface is sprayed with a layer of paint, so that the color is consistent with or similar to the equipment body, and the aesthetics is improved.

Read my article on Know More About The Main Transformer – DAELIM

What is the 225 kva transformer specification?

Below is specification for 225 kva pad mounted transformer, in the specification we can also see 225 kva transformer dimensions.

To know more about 225 kva pole mounted transformer, 225 kva dry type transformer, click below links:

Transformer, Single Phase, Pad Mount,225 kVA 4160GrdY/2400:12470GrdY/7200V

 

 

 

 

 

 

 

ITEM

DATA

UNIT

Offered

1

Supplier

….

Beijing Daelim

2

Model

….

ZGDL11-H-225/2.4-7.2

3

Country of origin

….

CHINA

4

Standard manufacturing and testing

….

IEEE Std. C57.12.00 IEEE Std. C57.12.90

5

Features

 

 

5.1

Type

 

Loop feed pad mount

5.2

Installation

 

Outdoor

5.3

Altitude above sea level/Ambient temperature

m/℃

1000/50

5.4

Altitude

 

≤1500m

5.5

Rated Power

kVA

225

5.6

HV

V

4160GrdY/2400

5.7

LV

V

12470GrdY/7200

5.8

Rated Frequency

Hz

60

5.9

Cooling System

 

ONAN

6

Number of winding

 

2

6.1

Number of phase

 

1

6.2

Core/Shell

 

Core type

6.3

Refrigerant

 

Mineral oil 45# (PCB FREE)

6.4

Working-Temperature

°C

-50°C to +40°C

6.5

Cooling Method

 

ONAN

6.6

The temperature rise -Top oil

°C

65

6.7

The temperature rise –Winding

°C

65

6.8

Hot spot

°C

80

7.1

Losses

 

 

7.1.1

No load losses at rated voltage and rated frequency on principal tap

W

500

7.1.2

Load loss at rated voltage

W

2000

7.1.3

Tolerance

 

NLL:±15%,Total loss: ±8%

7.3

Core material

 

Grain oriented silicon steel

7.5

Winding material

 

Copper

7.6

Tap changer

 

 

7.6.1

On load or off-circuit

 

off-circuit

7.6.2

Position of tapped winding

 

HV

7.6.3

Tap Voltages HV

%

±2×2.5%

7.6.4

Highest voltage for the enquipment

kV

35

7.6.5

Rated current of tap changer

A

63

7.7

High voltage electrical characteristics of transformers and assembled load break terminals

 

 

7.7.1

Insulation class

kV

5

7.7.2

BIL

kV

60

7.8

Low voltage

 

 

7.8.1

Insulation class

kV

15

7.8.2

BIL

kV

95

7.8.3

Audible sound level

db

55

7.9

Short-circuit capability

 

 

7.9.1

withstand capability per unit of base current (symmetrical)

 

35

7.9.2

Duration in cycles

 

60

8

Impedance

%

3

8.0.1

Impedance tolerance

 

±7.5%

8.1

Tank

 

Mild steel

8.1.1

Colors

 

Munsell Green

8.2

Total Dimentions

 

 

8.2.1

Height

mm

985

8.2.2

Depth

mm

1220

8.2.3

Width

mm

965

8.3

Weight

 

 

8.3.1

Oil

kg

375

8.3.2

Total

kg

1386

8.4

Accessories including:

 

 

8.4.1

Lifting lug

 

4

8.4.3

Parking stand bracket

 

4

8.4.4

LV bushing

 

2

8.4.5

Pressure relief valve

 

1

8.4.6

Drain Valve

 

1

8.4.7

Ground Strap cooper

 

1

8.4.8

HV bushing insert

 

2

8.4.9

Ground bar

 

1

8.5.0

Nameplate

 

1

8.5.1

ELSP fuse

 

1

8.5.2

Bayonet fuse

 

1

8.5.3

Tap changer

 

1

8.5.4

CEA ground bracket assy

 

1

8.5.5

Thermometer

 

1

8.5.6

Oil level gauge

 

1

8.5.7

Bushing well

 

2

8.5.8

LB Switch

 

1

9

Warranty:

Years

2

Try for free information about the The Ultimate Guide to Liquid Filled Transformer

How much does a 225 kVA transformer cost?

For a 225 kva single phase pole mounted transformer, the cost is around USD 5 000 per unit.

Let’s know learn more about the NEW ZEALAND CUSTOMERS

How much does a 225 kVA transformer weight?

The weight please refer above specification.

Keep on reading 110 kv Oil Filled Power Transformer – DAELIM BELEFIC

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About Bin Dong

Hello, I am Bin, General manager of Daelim which is a leading transformer manufacturer. If you have problems when you are looking for the equipment, what you need to do is tell us.