AUTOMATION 2000 DGPT2-IB - 3.2.2 Excessive Pressure Operation; 3.2.3 Temperature Operation

Pressure switch
3.2.2 Excessive pressure
Excessive pressure is usually due to an internal short-circuit, creating an electrical
arc strong enough to indirectly cause an instantaneous pressure increase.
Excessive pressure set-point is always defined by the transformer manufacturer.
P2 P1
(as an option)
When the tank pressure reaches the set-point value (±0.01 bar), the pressure switch’s
contact changes position.
3.2.3 Temperature
Temperature elevation is usually due to an electrical defect inside the transformer
tank causing a localized heating, or to an overcharge (an intensive transformer use
above the operating conditions given by the transformer manufacturer).
Temperature set-points are always defined by the transformer manufacturer.
T2 T1
When the dielectric temperature reaches the set-point value (±2.5°C), the
thermostat’s contact changes position.
T1 setting
system
NORMAL TEMPERATURE
Thermostats’ contacts
Terminal
block
NO
C
12
NC NO
C
9
8
7
NC
11 10
Setting system
NORMAL PRESSURE
Pressure switch’s contact(s)
Terminal
block
NO
C
6’
5’
4’
NC NO
C
6
5
4
NC
T2 setting
system
AUTOMATI ON 20 0 0
TECH. INSTRUCTIONS
Page
N° T/NOT-0021 Date: 28/09/16
Rev.
7
DGPT2
®
6