stp : flexible separator

STP : FLEXIBLE SEPARATOR
TO THE ELECTRICAL TRANSFORMER MARKET
1
DESCRIPTION
PRONAL, the world leader in the manufacture of products based upon elastomer-coated fabrics offers the STP flexible
separator to the electrical transformer market. The function of the STP separator is to line inside of the conservator
tank in transformers, allowing for changes in oil volume, while protecting the oil from any type of contamination or
external corrosive agents, such as air, ozone, nitrogen, humidity, etc.
STP separators are made from an elastomer-coated fabric, vulcanized at high temperature in a vacuum: fabric
reinforcement made of a high resistance polyamide thread, external coating designed to provide very high resistance
to transformer oil, internal protection resistant to nitrogen and atmospheric agents including ozone.
It offers a large range of elastomers to meet specific applications and a wide range of shapes and sizes to fit every
need. Designs exit to fit cylindrical, elliptical and rectangular conservator tanks.
The STP separator offers many advantages:
- Elimination of the air/oil contact, and of condensation
- Vulcanized-in flange which precludes the possibility of leakage
- Elimination of oxidation and hydrolysis that might stem from air contact
- Interior fabric reinforcement at points of contact with level indicator, to preclude the possibility of puncture
- Excellent impermeability to oil/gases and water vapour, through the use of a vulcanised-in barrier material
- Quick-Response Manufacturing to meet customer designs
- Large range of flanges to meet any requirement
- Easy quick assembly
- Superb service life in contact with air and oil
- High mechanical resistance
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STP : FLEXIBLE SEPARATOR
2
STANDARD EQUIPMENT
FLANGE: TYPE B1
Separator connection flange on
conservator. All other models on
request.
Conservator
Separator
Flange
FLANGE ASSEMBLY OF TYPE B1 FLANGE
The connection flange type B1 is shown on the
conservator (several other models available).
The flange is secured to the vulcanized insert.
This insert is fully embedded by vulcanizing into
the STP material thus ensuring that the unit is
fully sealed.
STP ATTACHMENT LUGS
Typically, the STPs are fitted with 2 attachment
lugs, located in a precisely-defined position. Special
positions or additional lugs are available upon
request.
ATTACHMENT LUG
3
Securing attachment lug on the conservator.
OPERATING PRINCIPLE
1
FLANGE
2
SECURING HOOK AND ATTACHMENT LUG
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3
LEVEL INDICATOR
STP : FLEXIBLE SEPARATOR
4
DIMENSIONS
The dimensions of the STP separator and its attachment lugs are defined using the dimensions of the
conservator tank itself.
As an example, please find below several models of STP separators manufactured for cylindrical conservators
with flat ends.
SIDE VIEW AS ASSEMBLED
TOP VIEW UNINFLATED
CONSERVATOR
SEPARATOR STP TYPE F1
Ø (mm)
Length
(mm)
Volume (l)
D
L
500
2 710
530
600
1 970
600
Expansion
volume (l)
Length
(mm)
Width (mm)
Distance between
axes (mm)
X
Y
Z
500
3 035
825
2 010
96
560
500
2 350
980
1 170
90
2 850
810
750
3 230
980
2 050
83
700
2 180
840
750
2 620
1 140
1 280
89
700
2 830
1 090
1 000
3 270
1 140
1 930
92
800
2 260
1 130
1 000
2 760
1 300
1 260
88
800
3 250
1 630
1 500
3 750
1 300
2 250
92
900
2 660
1 690
1 500
3 215
1 455
1 560
89
900
3 440
2 190
2 000
3 995
1 455
2 340
91
1 000
2 880
2 260
2 000
3 490
1 610
1 680
88
1 000
3 520
2 760
2 500
4 130
1 610
2 320
91
1 100
3 000
2 850
2 500
3 670
1 770
1 700
88
1 100
3 520
3 350
3 000
4 190
1 770
2 220
90
1 200
3 050
3 450
3 000
3 775
1 925
1 650
87
1 200
3 940
4 460
4 000
4 665
1 925
2 540
90
1 300
3 450
4 580
4 000
4 230
2 080
1 950
87
1 300
4 200
5 580
5 000
4 980
2 080
2 700
90
1 400
3 710
5 720
5 000
4 550
2 240
2 110
87
1 400
4 360
6 720
6 000
5 200
2 240
2 760
89
1 500
3 900
6 880
6 000
4 795
2 395
2 200
87
Other hoop positions available on request.
Additional hoops on request.
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Occupation
rate %
STP : FLEXIBLE SEPARATOR
5
SHAPES OF SEPARATORS AND CALCULATION FORMULAS
*
CYLINDRICAL CONSERVATOR
**
X (mm) = Length of conservator + Y – Diameter of conservator
Y (mm) = (П x Conservator diameter) + 40 mm
2
Z (mm) = X – Y – 200 mm
X : flat (fully deflated) length of the STP
Y : flat (fully deflated) width of the STP
Z : pitch distance of lugs
*
CUSTOMER SPECIAL REQUEST CONSERVATOR
ELLIPTICAL CONSERVATOR
X (mm) = length of conservator + 40 mm
Y (mm) = ½ developed length of the conservator
Z (mm) = X – (H x П) – 200 mm
2
X (mm) = length of conservator + 40 mm
Y (mm) = A + 2 x B + c
2
Z (mm) = X – (H x П) – 200 mm
2
**
**
X : flat (fully deflated) length of the STP
Z : pitch distance of lugs
*
Y : flat (fully deflated) width of the STP
H : conservator height
**
RECTANGULAR CONSERVATOR
X (mm) = length of conservator + 40 mm
Y (mm) = width of conservator + H + 40 mm
Z (mm) = X – (H x П) – 200 mm
2
X : flat (fully deflated) length of the STP
Z : pitch distance of lugs
Y : flat (fully deflated) width of the STP
H : conservator height
Other conservator shapes available on request.
6
* SEPARATOR SHAPE
**
CONSERVATOR SHAPE
LEVEL INDICATOR
The following table is used to select the type of level indicator (IDN), according
to the diameter of the conservator. Any non-standard indicator can be installed
on request.
Type
Ø conservator Float rod
length
Type
Ø conservator Float rod
length
IDN 1
500
370
IDN 7
1 100
1 030
IDN 2
600
480
IDN 8
1 200
1 140
IDN 3
700
590
IDN 9
1 300
1 250
IDN 4
800
700
IDN 10
1 400
1 360
IDN 5
900
810
IDN 11
1 500
1 470
IDN 7
1 000
920
These types of indicators may be delivered with or without 1 or 2 magnetic
contacts (assembly details on request).
PRONAL proposes standards dials but other types may be proposed on
request.
Always concerned with the improvement of the quality of its products, Pronal reserves the right to modify specifications without prior notice
PRONAL S.A. - Z.I. ROUBAIX EST - B.P. 18 - 59115 LEERS - FRANCE - TEL: 33 (0) 3.20.99.75.00 - FAX: 33 (0) 3.20.99.75.20
www.pronal.com - E.mail : pronal@pronal.com

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