1

Max. rated through-current (A)

500

600

800

1200

1500

2

Rated frequency (Hz)

50 or 60

3

Connection

3 phases for neutral point of star connection

1 phase for any selectable winding connection

4

Max. rated step voltage (V)

3300

5

Rated step capacity (kVA)

1400

1500

2000

3100

3500

6

Short-circuit

current test (kA)

Thermal (3s)

8

8

16

24

24

Dynamic (Peak)

20

20

40

60

60

7

Max. Operating Positions

Without change-over selector

18

With change-over selector

35

8

Insulation

to ground

(kV)

Highest voltage for

equipment Um

72.5

126

170

252

Rated separate source AC

withstand voltage (kV/50Hz,1min)

140

230

325

460

Rated lightning impulse

withstand voltage (kV,1.2/50μs)

350

550

750

1050

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)