AUTOMATION 2000 DGPT2-IB Instrukcje techniczne - Strona 5
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3– ELECTRICAL OPERATION
3.1 Preamble
All DGPT2
monitoring functions come with change-over contacts (a Normally
®
Opened contact, a Normally Closed contact and a Common point).
In
the
following diagrams,
(dead),
meaning
their respective monitoring functions.
3.2 Operating diagram
3.2.1 Gas discharge
Gas discharge is usually due to an electrical defect in the transformer active part,
creating an electrical arc not strong enough to cause an instantaneous pressure
increase.
Gas accumulation tank
Triggering float
Indicator float
Reed
When the gas volume inside the gas accumulation tank reaches a certain value
(depending on the dielectric density), the Reed contact changes position.
TECH. INSTRUCTIONS
DGPT2
®
A U T O M A T I O N 2 0 0 0
the
not
under
the
Dielectric density < 1 Volume < 140 cm
Dielectric density = 1 Volume = 140 cm
Dielectric density > 1 Volume > 140 cm
contacts
are
shown
influence
of
NORMAL LEVEL
Reed contact(s)
NO
NC
NO
C
3'
2'
1'
G2
(as an option)
Page
N° T/NOT-0021
5
unpowered
any
defect
for
NC
C
Terminal
3
2
1
block
G1
3
(±5 cm
)
3
3
3
Rev.
Date: 28/09/16
7