1

Max. rated through-current (A)

400

800

1200

400

800

1200

2

Rated frequency (Hz)

50 or 60

3

Connection

3 phases Y or D connection

1 phase for any selectable winding connection

4

Max. rated step voltage (V)

3300

5

Rated step capacity (kVA)

1200

2200

3200

1200

2200

3200

6

Short-circuit

current test (kA)

Thermal (3s)

8

8

12

8

8

12

Dynamic (Peak)

20

20

30

20

20

30

7

Max. Operating Positions

Without change-over selector

18

With change-over selector

35

8

Insulation

to ground

(kV)

Highest voltage for

equipment Um

17.5

40.5

72.5

Rated separate source AC

withstand voltage (kV/50Hz,1min)

50

85

140

Rated lightning impulse

withstand voltage (kV,1.2/50μs)

150

200

350

9

Internal Insulation Level

4 grades of B, C, D and DE according to insulation level

10

Mechanical life

Not less than 1,500,000 operations

11

Contact life

Not less than 600,000 operations

12

Oil compartment of diverter switch

Service pressure

0.03Mpa

Leakage test

No leakage under 0.08Mpa for 24 hours

Over pressure protection

Bursting cap busts at 300 ± 20%kPa

Protection relay

Oil flow speed set at 1.0m/s ±10%

13

Motor drive unit

SHM-D or CMA7

14

Oil filter plant

ZXJY-1 / ZXJY-2 / ZXJY-3 according to requirement (Necessary when max. rated through current is 1000A and above or OLTC used for industrial applications)