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QUALITROL
®
509ITM
– DW with Direct Winding
System Overview
The QUALITROL
®
509ITM - DW (509 DW) incorporates all the features of the 509ITM, along
with the ability to measure direct winding temperatures using fiber optic probes and to
compare these measurements to calculated winding temperatures. Once the fiber optic
probes are installed (see IST-096-1 Fiber Optic Installation Guide for details), the 509 DW
continuously measures the probes and incorporates the readings into all the 509ITM
functions. This allows the direct measurements to be used in the following ways:
•
To automatically compare calculated and direct winding temperatures
•
As a control signal or input for use in the relay logic matrix
•
As current loop outputs
•
As locally displayed values
The advantage of measuring direct winding temperatures with fiber optic probes over
calculated winding temperatures is that it provides you with actual winding temperature
readings. The disadvantage of this method is that it does not take into consideration
transformer loading, ambient conditions, and oil temperatures. Therefore, you might not
know if the winding temperature values are normal for those conditions or if there is a
reason for alarm.
On the other hand, the calculated winding temperature uses formulas (IEEE and IEC
models) to calculate the winding temperature based on information from the heat run data
and current conditions. In contrast to the direct measurement, this method takes into
account transformer loading, ambient conditions, and oil temperatures. The disadvantage of
this method is that it assumes the transformer is operating as originally specified.
By using these two winding temperature measurement methods, direct probes and
calculated, together, the 509 DW can automatically detect error conditions in the transformer
by using the calculated winding temperature as a benchmark, which would be the ideal
temperature, compared to the direct winding measurement, which reports the actual
temperature.
Note:
Fiber probes must be installed as the transformer is being manufactured or as the
windings are being rebuilt/re-wound. It is not possible to install fiber optic probes
without full access to the transformer windings.
Components
Fiber Optic Temperature Probe
The fiber optic probes are designed to be installed directly into the transformer windings.
See the Fiber Installation Guide. The fiber probes, CAB-699-X come in standard lengths
from 4 - 10 meters. Custom lengths are available.
Optical Feedthrough
Summary of Contents for 509ITM Series
Page 26: ...26 www qualitrolcorp com Current Input Wiring...
Page 55: ...55 www qualitrolcorp com 3 Continue with the setup procedure...
Page 101: ...101 www qualitrolcorp com...
Page 144: ...144 www qualitrolcorp com The following window will appear...
Page 167: ...167 www qualitrolcorp com The Customer Setup window displays 4 Click Load Tap Changer...
Page 178: ...178 www qualitrolcorp com Appendix...
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