Design
PEL
has a vast experience in design and
manufacturing of standard and
special purpose transformers. New
technical designs for improved
efficiency and quality against
special orders of non-standard
transformers are continuously being
explored. Dry type transformers for
Tarbela and Mangla Power Houses
Auxiliary Supplies were designed by
out Technical Department Special
transformers against Client's
specification have been manufactured
for use within and outside Pakistan.
PEL
make oil immersed transformers with
natural cooling are suitable for
both indoor and outdoor
installation. These transformers are
manufactured according to BSS-171,
IEC-76 or VDE-0532 tropicalised for
suitable operation in Pakistan,
Middle East and the Africa. The
standardized pole mounted
transformer up to 200 KVA capacities
are sealed type while all larger
sizes are conventional transformers
with conservator tanks provided with
dehydrating breather. All PEL make
transforms are offered with
tabulartanks as per temperature rise
specs.
Technical Specifications
|
Rated KVA |
% Z |
% Efficiency at 100% Load |
Core Losses (Watts) |
Copper Losses (Watts) |
% Regulation at 1.0 Power
Factor |
|
25 |
4.0 |
97.03 |
123 |
640 |
2.607 |
|
50 |
4.0 |
97.38 |
175 |
1170 |
2.392 |
|
100 |
4.0 |
97.72 |
310 |
2020 |
2.079 |
|
150 |
4.0 |
97.91 |
400 |
2800 |
1.929 |
|
200 |
4.0 |
98.02 |
495 |
3410 |
1.770 |
|
250 |
4.0 |
98.12 |
670 |
4100 |
1.706 |
|
300 |
4.0 |
98.16 |
800 |
4800 |
1.667 |
|
400 |
4.0 |
98.39 |
925 |
5600 |
1.470 |
|
500 |
4.0 |
98.42 |
1200 |
6800 |
1.430 |
|
630 |
4.0 |
98.51 |
1350 |
8150 |
1.365 |
|
750 |
5.0 |
98.20 |
1700 |
12000 |
1.712 |
|
800 |
5.0 |
98.22 |
1800 |
12700 |
1.699 |
|
1000 |
5.0 |
98.32 |
2000 |
15000 |
1.613 |
|
1250 |
5.0 |
98.46 |
2500 |
17000 |
1.475 |
|
1500 |
6.25 |
98.48 |
3000 |
20000 |
1.519 |
|
1600 |
6.25 |
98.49 |
3200 |
21300 |
1.517 |
|
2000 |
6.25 |
98.59 |
3500 |
25000 |
1.437 |
|
2500 |
6.25 |
98.65 |
4000 |
30000 |
1.388 |
|
3000 |
6.25 |
98.70 |
4500 |
35000 |
1.355 |
|
3500 |
7.15 |
98.73 |
4800 |
40000 |
1.391 |
|
4000 |
7.15 |
98.76 |
5200 |
45000 |
1.374 |
|
4500 |
7.15 |
98.77 |
5600 |
50000 |
1.360 |
|
5000 |
7.15 |
98.79 |
6000 |
55000 |
1.349 |
|
6000 |
7.15 |
98.85 |
6800 |
63000 |
1.300 |
Type Test Certifications
|
 |
KEMA
Holland |
|
|
RAWAT Pakistan |
|
|
NIP
Pakistan |
|
|
U.E.T. Lahore, Pakistan |
Construction
PEL
make standard Transformers are
designed for 11/0.415 KV, 3 phase,
50 Hz. Delta-Star connections with
neutral brought out from secondary,
for 40/50-55/65oC
temperature rise. Transformers with
other primary voltages (up to 33KV),
secondary voltage, type of
connections and temperature rise are
being designed and manufactured as
per requirements.
It is
our constant endeavor to improve
design and we therefore, reserve the
right to supply transformers
different in details.
|
A. Standard Fittings |
|
|
Filling Device |
|
|
Drain Plug (Drain Valve for
capacities above 200KVA) |
|
|
Oil Level Indicator |
|
|
Roller Wheels /
Bi-Directional Wheels |
|
|
HV Porcelain Bushings |
|
|
LV Porcelain Bushings |
|
|
Off Load Tap Changer |
|
|
Earthling Terminal |
|
|
Rating Plate and Name Plate |
|
|
Conservator and Silicagel
Breather (with conservator
types only) |
|
B. Additional Fittings on
Request |
|
|
Thermometer pocket with
thermometer |
|
|
Buckholz Relay |
|
|
Pressure Relief
Vent/Pressure Relief Device |
|
|
HV/LV Cable End Box |
|
|
HV/LV Bus Connecting Box |
|
|
Dial Type Thermometer with
Max. Indicator |
|
|
Dial Type Thermometer with
alarm & trip contacts |
Features
|
1. |
Windings
Enameled and Paper
insulated high conductivity
copper is used for all HV &
LV windings. In PEL's
distribution transformers up
to 200KVA, packet windings
with enameled copper wire
are used on the HV side
which increases the short
circuit withstand capacity. |
|
2. |
Insulation
Very high quality, greater
dielectric strength &
durable insulations are used
in the transformer. These
insulations are press pan,
cable paper, varnishes and
craft paper sheets. Proper
clearances are maintained
for the appropriate system
voltage to meet the IEC
tests specifications e.g.
11KV LI 95-AC 28/AC3. |
|
3. |
Core
PEL-make transformer cores
are manufactured from high
quality cold-rolled silicon
steel sheets. |
|
4. |
Tank
Tubular corrugated type
tanks are made and all tanks
are pressure tested before
assembly. |
|
5. |
HV Bushings
Transformers are generally
equipped with three high
voltage insulator bushings.
Where star point connections
are required on the high
tension slide, four bushings
are provided. |
|
6. |
LV Bushings
Low voltage side is provided
with four porcelain bushings
and the neutral is brought
out on one of the bushings. |
|
7. |
Tap Changer
Off load circuit tap changer
is build in with a vertical
shaft and has different
operating positions as
required. Deviations from
this design can be supplied
on special order and
requirements. |
|
8. |
Oil Level Gauge
Oil Level Gauge is
fitted on the oil
conservator and permits
direct observation of its
contents through a
transparent plastic tube. On
sealed type transformers,
this is fitted on the side
wall above the tubes. |
|
9. |
Roller Wheels
Transformers are carried on
flat-rimmed roller wheels.
The axles are easily set
over for either broad-side
or lengthwise travel of the
wheels (centre distance
remaining the same). |
|
10. |
Earthing Terminal
Each Transformer is provided
with an earthing terminal. |
|
11. |
Oil Draining Device
There is an oil draining
device at the bottom of the
Transformer tank from where
oil can be drained out. The
vent is plugged by a screw
cap which makes it possible
to take out even very small
quantities for simple
testing. |
|
12. |
Transformer Oil
Transformers are
supplied with a first
filling of high di-electric
strength transformer oil
duly tested and treated at
PEL Works. |
Technical Specification for Export
Items
The
following transformers are
manufactured on the following system
voltages:
6.6KV, 11KV, 13.8KV, 15KV, 20KV,
33KV at frequency 50 Hertz and 60
Hertz.
|
Rating (KVA) |
% Z |
Core Losses (Watts) |
Copper Losses (Watts) |
|
50 |
4.0 |
250 |
1500 |
|
100 |
4.0 |
250 |
1500 |
|
200 |
4.0 |
380 |
2200 |
|
300 |
4.0 |
520 |
3200 |
|
500 |
5.0 |
750 |
4700 |
|
1000 |
6.0 |
110 |
9000 |
|
1500 |
6.0 |
1700 |
14000 |
|
2000 |
6.0 |
2300 |
19000 |
|
3000 |
6.0 |
3000 |
25000 |
Inspection and Testing
All
PEL-make Transformers undergo
stage-wise inspection and then
complete routine tests by the
inspection and Quality Control
Department. In addition, Type Tests
are carried out as per contractual
conditions. Our testing & QC
Department offers technical
inspection to the client before
delivery of the transformers and
prepares a complete set of factory
test reports before the dispatch of
the transformers.
|
Rating (KVA) |
A |
B |
C |
D |
E |
F |
G |
Total
Weight (Ton) |
|
25 |
888 |
* |
1034 |
634 |
520 |
632 |
1208 |
0.3 |
|
50 |
963 |
* |
1201 |
791 |
520 |
632 |
1283 |
0.45 |
|
100 |
1041 |
* |
1486 |
996 |
520 |
632 |
1361 |
0.67 |
|
200 |
1220 |
* |
1608 |
1038 |
520 |
632 |
1540 |
1.12 |
|
400 |
1368 |
2108 |
2350 |
1600 |
670 |
780 |
** |
2.0 |
|
500 |
1375 |
2115 |
1810 |
1140 |
670 |
780 |
** |
2.2 |
|
630 |
1395 |
2135 |
2015 |
1175 |
670 |
780 |
** |
2.6 |
|
750 |
1510 |
2250 |
2095 |
1315 |
670 |
780 |
** |
2.7 |
|
1000 |
1555 |
2295 |
2225 |
1465 |
820 |
820 |
** |
3.35 |
|
1250 |
1560 |
2300 |
2525 |
1665 |
820 |
820 |
** |
3.85 |
|
1500 |
1720 |
2460 |
2500 |
1560 |
820 |
820 |
** |
4.65 |
|
2000 |
1800 |
2635 |
2775 |
1845 |
820 |
820 |
** |
6.0 |
|
2500 |
2020 |
2855 |
2810 |
1830 |
1020 |
1020 |
** |
6.5 |
|
3000 |
2040 |
2875 |
3050 |
2040 |
1020 |
1020 |
** |
7.5 |
|
3500 |
2036 |
2870 |
3756 |
2716 |
1020 |
1020 |
** |
8.5 |
|
4000 |
2505 |
3339 |
3520 |
2250 |
1675 |
1675 |
** |
9.5 |
|
6000 |
2505 |
3339 |
3670 |
2710 |
1675 |
1676 |
** |
10.5 |
*
Seal Type
** Conservator Type
Note:
Dimensions are approximate in mm
