High Durability Transformer Breathers
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High Durability Transformer Breathers

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The failure or malfunction of many transformers or similar equipment can be directly attributed to the lack of proper control of the level of water vapor entering the equipment. It is essential, therefore, that a very low level of humidity is maintained in the airspace of the conservator tank to avoid deterioration in the insulating properties of the cooling medium. AGM’s High Durability Transformer Breathers provide an economic and efficient means of controlling the level of moisture entering equipment during the change in volume of the cooling medium and/or airspace caused by temperature gradients.

High Durability Transformer Breathers are filled with self-indicating silica gel desiccant which changes color from blue to pink or orange to green as it becomes saturated with water vapor.  Transformer Breathers are designed to enable the quick and easy replacement of the desiccant charge.  When the bottom half of the desiccant is pink or green, the charge should be replaced.  Replacement of either type of silica gel is available in standard 25 kg containers. If a smaller quantity is needed, please contact AGM for repackaging options.

AGM’s Transformer Breathers are constructed with a tough UV stabilized glass loaded polycarbonate, which is extremely durable. They are fitted with a two-way relief valve mechanism that eliminates all maintenance except when the desiccant needs to be replaced. These Transformer Breathers have a viewing window (there is 180 degree visibility on the small units) to easily determine when the desiccant needs to be replaced.

HIGH DURABILITY TRANSFORMER BREATHERS SELECTION GUIDE

Desiccant Charge in Lbs. (kgs)
Part Number
Model
Max. Oil
Contents
in Gal. (Liters)
Approx.
Transformer
Rating (MVA)
Max. Air
Space Volume
in Gal. (Liters)
11.02
(5.0)
BL/D6290/01
V
2998
(11,350)
9
634
(2,400)
22.05
(10.0)
BL/D6290/02
W
5,997
(22,700)
30
1,268
(4,800)
31.97
(14.5)
BL/D6290/03
X
8,995
(34,050)
60
1,915
(7,250)
38.58
(17.5)
BL/D6290/04
Y
12,007
(45,450)
100
2,559
(9,685)
60.19
(27.3)
BL/D6290/05
Z
18,003
(68,150)
180
3,830
(14,500)
Part Number
Approx. Daily
Breathing Rate
in Gal. (Liters)
Max. Air Volume
Before Recharge
in Gal. (Liters)
Approx. Charge
Life in (Days)
Overall Length H in In. (MM)
Dimension D in In. (MM)
BL/D6290/01
37
(140)
12,007
(45,450)
320
14.8
(375)
10.0
(255)
BL/D6290/02
74
(280)
24,013
(90,900)
320
21.9
(555)
10.0
(255)
BL/D6290/03
111
(420)
36,059
(136,500)
320
28.9
(735)
10.0
(255)
BL/D6290/04
151
(570)
48,026
(181,800)
320
19.1
(485)
14.0
(355)
BL/D6290/05
222
(840)
72,040
(272,700)
320
25.4
(645)
14.0
(355)
Part Number
Female Pipe Thread Size
Charge Length J in In. (MM)
Charge Diameter G in In. (MM)
BL/D6290/01
3/4″-14 BSPP but 3/4″-14 NPSM will work
8.94
(227)
8.15
(207)
BL/D6290/02
3/4″-14 BSPP but 3/4″-14 NPSM will work
16.00
(407)
8.15
(207)
BL/D6290/03
3/4″-14 BSPP but 3/4″-14 NPSM will work
23.10
(407)
8.15
(207)
BL/D6290/04
1″ BSPP but 1″-11-1/2 NPSM will work
13.46
(342)
12.05
(306)
BL/D6290/05
1″ BSPP but 1″-11-1/2 NPSM will work
19.76
(502)
12.05
(306)

The table above should be used for the basic selection of a Transformer Breather.  In order to assess the size of the breather, the air volume above the oil in the conservator tank is the most important factor.  The quantity of oil and the transformer rating is of secondary importance. Transformer Desiccant Breather models V, W and X have a 3/4″ female pipe thread; models Y and Z have a 1″ female pipe thread.

The daily breathing rate is based on the assumption that there are two temperature drops of 8°C per 24 hours.  The breathing volume change, which occurs during the pump start-up, is not taken into consideration.

If your needs exceed what is listed in the table, please contact AGM for our double and triple chamber models.

The typical desiccant fill for Transformer Breathers is 2-5 mm beaded blue indicating silica gelOrange silica gel is also available.  The sight windows on models V, W, X, Y and Z and the double and triple units are manufactured from the same material.

It is important to emphasize that, with the exception of routine inspection to determine the condition of the desiccant, AGM’s Transformer Breathers are virtually maintenance free.

BL/D6290 Drawing

V, W, X, Y and Z Transformer Desiccant Breather

Additional information

Weight 0.0000 lbs
Dimensions 0.0000 × 0.0000 × 0.0000 in
Desiccant Charge

, , , ,

Desiccant Type

Silica Gel

Drawing

Installation Guide