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Using an optical hot spot module with a digital connection
For 509 DW units using a digital interface between the 509 DW and the optical hot spot
module, no additional input modules are needed. Instead, a digital connection is used for the
509 DW.
Comparing direct and calculated winding temperature methods
The calculated winding temperature provides the theoretical winding temperature based on
the present conditions (loading, ambient, oil temperature) and original heat run data. The
direct fiber winding temperature provides the actual winding temperature for the present
conditions. Only by comparing these two methods of determining a winding temperature can
you make full use of the data as a predictor for possible transformer problems. You can
accomplish this by using the matrix control of the output relays.
Example:
If the calculated winding temperature is derived at Input Module 2 (CT,
Temperature), and the first Fiber Optic Probe (Fiber1) measures the winding temperature
directly, then the relay may be configured as follows (for example purposes only):
Control Signal 1
Fiber1
Setpoint 1
10 (this value would be derived from measurements/experience)
Hysteresis 1
5
Direction 1
Up
Math Expression 1
Minus
Control Signal 2
Input Module 2; CT, Temperature
Math Expression 2
OR
Control Signal 3
Fiber 1
Setpoint 3
-5 (this value would be derived from measurements/experience)
Hysteresis 3
5
Direction 3
Down
Control Signal 4
Input Module 2; CT, Temperature
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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