Pad Mounted Transformer
YB27 series Prefabricated transformer substation is our company made Pad mounted transformer. It is an important equipment in the cable distribution network. It is a kind of complete prefabricated product with high voltage control, protection, power transformation and power distribution, It is widely used in 7.2~40.5kV electric power distribution system, widely used in the urban and rural distribution network . This equipment complies with the requirements of  standard IEC61330 etc.
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  • product details
  • Substation Structure Characteristic

Product description

  • The product equipped the HV load switch and HV fuse in transformer oil .It has common box or separate box with transformer body. Oil tank is enclosed sealed with oil temperature gauge, oil level indicator, pressure gauge , pressure relief valve ,drain oil valve etc to monitor the transformer working conditions.The product has loop feed ,radial feed & power supply type.In order to make this product more suitable for the actual requirements of power grid , we have also introduced plug-in type dry type fuse which fusing do not affect the transformer oil. According to the complexity of low voltage outgoing requirements,YB27 enclosure has standard type, intensive and comprehensive type to make user choice more economic & flexible.

Model

Service conditions

  • 1.Ambient air temperature: -30℃~+50℃
    2.Altitude : Maximum installation altitude: 2500m
    3.Outdoor wind speed is not more than 34m/s;
    4.Relative humidity: daily average value ≤95%, the monthly average value ≤ 90%;
    5.Inclination of installation site : not more than 3 °;
    6.Installation site: no explosion danger, serious pollution, chemical corrosion , severe vibration

Products advantage:

  • 1.Compact structure, small volume, is only about the 1/3 – 1/5 of the same capacity european type substation, which greatly reduce the occupation area
    2.Fully sealed and fully insulated structure, no need insulation distance .
    3.The wiring connection of high voltage can be used in loop feed and radial feed. Power supply method is flexible and reliable.
    4.Excellent performance; low consumption, low noise, low temperature –rising, high overload, anti short-circuit, high impact resistance, reliable protection of personal safety
    5.Meet all kinds of low voltage outgoing requirements .
    6.Cable head has 200A elbow plug & 630A “T” shape fixed type. All insulated Zinc Oxide lightning arrester can be configured. 200A cable head can be plugged in with load, also can be acted as isolation switch.

Products structure:

1. Plug-in fuse
2. Pressure gauge
3. Pressure relief valve
4. Oil level indicator
5. Oil temperature gauge
6. Load break switch
7. High voltage cable connector
8. Off load tap changer
9. Grounding points
10. Drain valve
11. Low voltage switchgear

Technical parameter


Item

Unit

Parameter



High Voltage Unit

Rated frequency

Hz

50/60

Rated Voltage

kV

11

13.8、15

20、22

30,33,36

Max service voltage

kV

12

17.5

24

40.5

Rated current

A

400、630、1250、1600、2000、
2500

transformer current

A

400~2500


1min power frequency withstand voltage to earth and phase
to phase /Fracture


kV

42/48

48/55

55/65

85/95

BIL: to earth and phase to phase
/Fracture

kV

75/85

90/105

125/150

170/185

Rated short circuit breaking current

kA

25、31.5、40



Transformer Unit

Rated Voltage

kV

11、13.8、15、20、22、30、33、36

Rated Capacity

kVA

160~1250

Tap ranging

%

+/-2x2.5%、+/-5%

Vector Group


Yyn0、Dyn11

Impedance

%

4、4.5、6、8



Low Voltage Unit


Rated Voltage


V


220、400、690、800


Main circuit rated current


A


400~2500


Branch current


A


63~1250



Enclosure


Protection Level


HV Room:IP44
Transformer Room:IP44
LV Room:IP44


Noise level


dB


≤50

Structure characteristics

  • The enclosure structure is made of channel steel and angle steel which has higher mechanical strength. The enclosure is made of aluminum alloy plate ,its face is even and smooth . The product is elegant appearance with better anti-erosion. The foundation of substation is higher 300- 600 mm than ground. All the doors are opened outward with angle more than 90°. The substation has handle, dark latch and dormant lock with waterproof anti-blocking and anti rust.

  • The body is whole enclosed against theft to ensure the working under a common air temperature, the temperature of all electrical devices do not be more than the max. allowed temperature of itself. It is equipped with enough natural vents and insulation measures.The prefabricated transformer substation is equipped with special grounding conductor .On the grounding conductor ,there has terminals to connect with ground net .Its number is more than two pieces and has obvious grounding mark. The ground terminal is copper bolt with diameter more than 12mm. The grounding conductor adopts copper strip which current density can not be more than 200A/mm, the cross section is more than 30mm , to ensure that the flow through the maximum short-circuit current does not overheat or affect the safety of the surrounding objects. Dynamic and thermal steady current of the special grounding conductor should be equipped with grounding methods of H.V. power distribution devices.

Transformer performance parameter

Pad mounted transformer -Transformer parameter

No

Capacity

Rated voltage

Tap
Range
(%)

No load current (%)

Losses(W)

Impedance
(%)

kVA

HV
(kV)

LV
(kV)

S9

S11

No load

Load

S9

S11

S9

S11

1

30



6.6
7.2
11
13.815
20
22
30
33
36



0.4
(0.69)



+/-5
±2*
2.5%

2.2

2.0

130

600

4

2

50

2.0

1.8

170

870

3

63

1.9

1.5

200

1040

4

80

1.7

1.2

250

1250

5

100

1.6

1.1

290

1500

6

125

1.5

1.0

340

270

1800

7

160

1.4

1.0

400

310

2200


8

200

1.4

0.8

480

375

2600

9

250

1.2

0.8

560

400

3050

3000

10

315

1.1

0.7

670

475

3650

3600

11

400

1.0

0.7

800

570

4300

4200

12

500

1.0

0.6

960

680

5100

5000

13

630

0.9

0.6

1200

800

6200

6000

4.5%

14

800

0.8

0.6

1400

1120

7500

7400

15

1000

0.7

0.5

1700

1320

10300

9860

16

1250

0.6

0.5

1950

1360

12800

12000

17

1600

0.6

0.5

2400

1840

14500

14000

Note:

a. According to customer requirements, the high voltage tap range of transformer can be designed to be + 2 * 2.5%.
b. According to customer requirements, the transformer low voltage can be designed as 0.69kV

Load break switch parameter

Rated Current (A)

Rated Voltage (kV)

BIL
(kV)

Power frequecny
Withstand voltage
(1min.kV)

Rated short - time withstand current
(kA/S)

Short circuit making current
(kA)

Rated withstand current (peak)
(kA)

Load
Operation
times
(kA)

Mechanical
Operation
times

315

11

75

42

12.5/2

31.5

31.5

100

2000

630

11

75

42

16/4

40

40

100

3000

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