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New SDZV Vacuum Tap-changer Launched

Date: 2020-04-01
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Huaming’s new SDZV vacuum tap-changer was launched to the market, an optimized product based on SHZV, with a better performance in distinguishing arcing and a higher max. rated current of 3000A.


* Adopting the same structure of traditional SHZV tap-changer, SDZV inherits SHZV’s advantages, including inputting force from the head, arranging cables outside the oil compartment and transmitting force in the middle.

* SDZV vacuum tap-changer is equipped with vacuum interrupters with two sets of contacts arranged in series. Two sets work simultaneously, but the arc-distinguishing compartments are relatively independent, both capable of making and breaking.

New SDZV Vacuum Tap-changer Launched                New SDZV Vacuum Tap-changer Launched

* The recovery voltage after vacuum interrupters break the current is reduced to previous 1/2, preventing re-ignition.

* When the two sets of contacts break, there are arcs on every contact. After the current is zero, the re-ignition is possible only when there is re-ignition on both contacts, more difficult than the traditional single-set design. As a result, SDZV is more reliable.

* SDZV has a max. rated current of 3000A and max. capacity of 6000V.


Item

Description

SDZVIII

SDZVI

1

Max. rated through current (A)

400

600

1000

1300

400

600

1000

1600

2400

3000

2

Rated frequency (Hz)

50 or 60

3

Connection

3-phase Y-connection

for neutral point only

Single-phase for any selectable

winding connection

4

Max. rated step voltage (V)

6000

5

Rated step capacity

2250

2400

4500

4950

2250

2400

4500

6600

8400

9000

6

Short-circuit

current test (kA)

Thermal (3s)

6

8

12

15

6

8

12

24

24

30

Dynamic (peak)

15

20

30

37.5

15

20

30

60

60

75

7

Max. operating positions

35 without change-over selector; 107 with change-over selector

8

Insulation to ground

The highest voltage

for equipment (kV)

72.5

126

170

252

Rated separate source AC withstand voltage (kV/50Hz,1min)

140

230

350

460

Rated lightning impulse

withstand voltage (kV,1.2/50μs

350

550

750

1050

9

Tap selector

Categorized into B, C, D & DE four sizes


Max. working positions

14 without change-over selector

27 with change-over selector

10

Mechanical life

Not less than 1,500,000 operations

11

Electrical life

Not less than 600,000 operations

12

Oil compartment

of diverter switch

Service pressure

0.03 MPa

Leakage test

No leakage under 0.08 MPa for 24 hours

Over pressure

protection

Rupture disc bursts at 300 ± 20% KPa

Protective relay

Set oil flow speed at 1.0m/s ± 10%


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