Type CV is a typical selector switch structure tap changer, an ideal solution for medium power transformers (up to 110kV) down to distribution transformers. Its compact size allows transformers designers to achieve the most optimal tank design.
Item
Specification
CVIII350Y
CVIII350D
CV350
SVIII500Y
SVIII500D
CV700
1
Max. rated through-current (A)
350
500
700
2
Rated frequency (Hz)
50 or 60
3
Number of poles
Connection
Y-in the neutral, D and single pole-in any part of the winding
5
Max. rated step voltage (V)
10 contacts
1500
12 contacts
1400
14 contacts
1000
-
6
Rated step capacity (kVA)
525
400-525*
660
420
325-420*
520
450
7
Short-circuit
current test (kA)
Thermal (3s)
10
Dynamic (Peak)
12.5
17.5
25
8
Max. Operating Positions
Without change-over selector
14
12
With change-over selector
27
23
9
Insulation
to ground
(kV)
Highest voltage for
equipment Um
40.5
72.5
Rated separate source AC
withstand voltage (kV/50Hz,1min)
85
140
Rated lightning impulse
withstand voltage (kV,1.2/50μs)
225
Internal Insulation Level
Refer to Technical Data section 4.6
11
Mechanical life
Not less than 800,000 operations
Contact life
Not less than 200,000 operations
13
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%
Motor drive unit
SHM-D or CMA7
15
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)
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