1. Introduction
Electronic device RTT 8 is meant to find out excess temperature of transformers equipped
with PT100 sensors.
2.
Use
RTT 8 is dedicated to monitor temperature of both dry and resinblock transformers equipped
with PT100 sensors. It is able to control temperature of up to 5 sensors. The relay with switching
contacts is applied as the device outputs for each temperature threshold.
3.
Technical data
Nominal Voltage:
42 – 240 V AC or 42 – 240 V DC without switchings
Maximum absorbed power:
10VA
Number of inputs
5 sensors PT100
Isolation:
Power supply to housing
2,5 kV
Inputs to housing
2,5 kV
Output to housing
2,5 kV
Power supply to output
2,5 kV
Power supply to input
2,5 kV
Input to output
2,5 kV
Protection
IP 65
Dimensions
212x216x120 (see dwg.2)
Position of operation
any
Weight
1,5 kg
Temperature scale
70°C – 220°C with 1°C resolution
Time relay delay
70s – 220s or 70min. – 220 min.
Operating temperature
0 – 45°C
Storage temperature
-25C – 85C
Diameter of linking cables
max 2,5 mm
2
Maximum switch current:
8A / 250VAC/24VDC
Maximum switch power:
2kVA / 192W
Maximum switch voltage:
400V AC / 150V DC
Operation in environment free from any inflammable or chemically active dusts and gases is essential.
4.
Installation
Fasten the device with three M5 screws through the holes in the bottom part of the housing.
RTT8 ought to be used and kept away from water, conducting or not conducting dusts, explosive,
inflammable and chemically active gases, dusts and vapours. Connect protective earth, power supply,
and the sensors. Connect output contacts as desired. Connect data transfer cables (option).
5.
Functioning of the operating programme
After switching on power supply initiation of the display is carried out. Then the internal
system is tested. At the next step the programme is proceeding to verification of the user’s password.
If the password is entered, no changes to the original settings
will be possible. After 30 days of
operation all functions of the device will be blocked unless the password is re-entered.
If the password is not entered the programme will start to work with original settings after it has been
switch on for the first time.
If any faults occur (i.e. heavy interference or lack of power supply) the device can return to its
initial settings.