4
Safety
Product description
Safety instructions
Make sure that any person installing, taking into operation
and operating the self-dehydrating breather:
• is technically qualified and competent
• fully complies with these assembling instructions
Improper operations or misuse could cause danger to:
• life and limb
• the equipment and other assets of the operator
• the equipment proper function
Safety instructions in this manual are shown in three
different forms to emphasize important information.
Safety notes on the equipment operation
Electrical installation is subject to the relevant national
safety rules.
It is mandatory to connect the grounding cable to the
ground screw (Fig. 8-9).
This information indicates particular danger to life and health.
Disregarding such a warning can lead to serious or fatal injury.
It is important to observe the limit values indicated on
the nameplate and in the operating instruction before
commissioning the device.
All relevant fire protection regulation must be strictly observed.
This information indicates particular danger to equipment or
other property of the user. Serious or fatal injury cannot be
excluded.
Installation, electrical connection and fitting the device may only
be performed by qualified personnel and only in accordance
with this instruction manual. It is the responsibility of the user
to ensure that the device is used for specified application only.
For safety reasons, please avoid any unauthorized and improper
usage.
During the regeneration phase, the surface temperature
increases. Touching the surface is dangerous.
This notes give important or specific information concerning the
equipment or as to work with the equipment.
WARNING
WARNING
WARNING
CAUTION
CAUTION
CAUTION
NOTE
The dehydrating breather is used for oil-insulated tran-
sformer and on-load tap-changer to dry the air which is
suctioned in by the oil conservator during the thermal
contraction of the oil mass.
During the normal operation the oil conservator intakes
air that passes through the metallic filter (Fig. 8-9; intel/
outlet air). The metallic filter stops dust, sand and other
particles from the contaminating air. The air then passes
through the tank 1. The salt tank is filled with silica gel
that absorbs the moisture.
When the silica gel absorbs the moisture, the weight of the
salt and the relative humidity of air increase.
Monitoring of silica gel status is carried out by:
• Weight cell and Humidity sensor for eSDB M/L
• Humidity sensor for eSDB XS/S
When the weight and/or relative humidity increase and
exceed the pre-set value a regeneration process starts.
Two heating systems (inside tank 1 and 2) are alternately
activated; the solenoid valve is energized during the tank
1 regeneration.
The water vapor leaving the silica gel is expelled outward
by a fan that also dissipates the heat (eSDB M/L).
Inside the tank, a probe monitors the temperature of the
heating element.
No maintenance is required for replacement and
regeneration of the desiccant.
SELF-DEHYDRATING BREATHERS eSDB XS/S/M/L
