93
A
Temperature Controller of Dry-type Transformer
Setting Instruction
Caution!
A.1 Overview of LD-B10 series instruments
A.1.1 Features
LD-B10-10 series temperature controller of dry transformer(referred to as temperature controller) is an intelligent
controller designed specially for safe operation of dry transformer. The temperature controller features adoption of
single chip computer technology and utilization of the three platinum thermo-resistors embedded in the 3-phase
winding of the dry transformer for detection and display of temperature rise of the transformer windings. It can
start or stop the cooling fan automatically for forced air cooling of windings and control over-temperature alarm
and over-temperature tripping output so that the transformer will be operated safely. The main features as the
following:
A.1.2 Technical Indicators
1. Range of measurement:-0.0
℃～
200.0
℃
2. Accuracy of measurement:
Grade of accuracy: Grade 0.5
Resolution: 0.1
℃
3. Operating conditions:
Room temperature: -20
℃～
+55
℃
Relative humidity <85
％
+10%
Power voltage: AC220V -15% or 24VDC, voltage level is based on the actual VFD.
Power frequency: (50Hz~ 60Hz) ±2Hz
4. Parameter of the sensor: Pt100
5. Anti-jamming performance satisfy the JB/T7631:
1) The interference voltage for common code 250V (AC, 50Hz) or series mode 200mV (AC, 50Hz), the change of
the display value is less than the basic error.
2) Electric fast transient
The power cable of instrument and the input/output terminal can withstand the frequency of 5KHz. The electric
fast transient test with the voltage of 1kV and 0.5kV, respectively, shows that the absolute value of the limited error
limit meets the standard requirement .
Before the testing of the withstand voltage, the sensor cable plug should be separated from the
temperature control instrument first, so as to avoid damage to the temperature control instrument !
