|
Tap changing gear | |
|
i)
Type | |
|
ii)
Provided on | |
|
iii)
Tap range | |
|
iv)
Step Voltage | |
|
v)
Rated voltage of on load tap
changer | |
|
vi)
Rated current of on load Tap
changer | |
|
Over voltage operating capability and duration | |
|
|
Max flux density in any part of core and yoke at rated MVA
,normal voltage(Tesla) | |
|
Current density of HV /LV Windings | |
|
Insulation Levels for windings | |
|
a)
1.2 /50 micro - second wave shape
impulse withstand (kVp) | |
|
b)
Separate source withstand voltage
(kV rms) | |
|
c)
Power frequency voltage withstand
(kVp) | |
|
Type of winding insulation | |
|
a)
HV | |
|
b)
LV winding | |
|
System short circuit level and duration for which the
transformer shall be capable to withstand thermal and dynamic stresses (kA
rms /Sec) | |
|
Noise level at rated voltage and frequency | |
|
Permissible temperature rise over ambient temp of 50 DC | |
|
i)
Of top oil measured by thermometer | |
|
ii)
Of winding measured by resistance | |
|
Minimum clearance in air (mm) | |
|
HV | |
|
a)
Phase to Phase | |
|
b)
Phase to ground | |
|
LV | |
|
c)
Phase to Phase | |
|
d)
Phase to ground | |
|
Terminals : | |
|
a)
HV winding Line end | |
|
b)
HV winding Neutral end | |
|
c)
LV Winding | |
|
Bushing current rating | |
|
HV | |
|
LV | |
|
Max Radio Interference voltage level at 1 MHZ & 1.1
times max rms phase to ground voltage for HV Terminal Connector | |
|
Cooling Equipments | |
|
a)
Number of Banks | |
|
b)
No of Pumps | |
|
c)
No of fans | |
|
Insulation level of bushings | |
|
a)
Lightning impulse withstand (kVP) | |
|
b)
Switching impulse withstand (kVP) | |
|
c)
1 Minute power frequency withstand
voltage (kV rms) | |
|
d)
Creepage distance (mm) | |
|
Bushing current transformers for purchasers use
(for restricted E/F protection) | |
|
i)
Type | |
|
ii)
Quantity | |
|
i)
No of Cores | |
|
iii)
Current Ratio (A/A): (A/A) | |
|
ii)
Turn ratio | |
|
iv)
Knee Point Voltage | |
|
v)
Accuracy class | |
|
iii)
Location for mounting | |
|
HV Neutral side CT
for owners use | |
|
iv)
Type | |
|
v)
Quantity | |
|
vi)
No of Cores | |
|
vii)
Current Ratios (A/A) | |
|
viii)
Turn ratio | |
|
ix)
Knee point voltage | |
|
x)
Class of accuracy | |
|
xi)
Location for mounting | |
|
Bushing CT on LV side for load measurement | |
|
i)
Type | |
|
ii)
Current ratio | |
|
iii)
Burden in VA | |
|
iv)
Accuracy class | |
|
v)
No of cores | |
|
LOSSES | |
|
Maximum acceptable (without any positive tolerance) no load
loss (Iron Loss )at rated voltage and at rated frequency at 75 deg C in KW | |
|
Maximum acceptable (without any positive tolerance) load
loss including cooler loss because of power consumption by the cooler fans
,motor pump sets etc at rated current and at rated frequency at 75 deg C in
KW | |
|
Maximum acceptable (without any positive tolerance) Auxiliary Loss
in KW | |
How to Calculate the Parameters of a Transformer Specification
Re: how to calculate the parameters of a transformer specification
