LumaSense Technologies LumaSHIELD Controller Installation Guide: Winding Temp. Sensors - Manual

LumaSHIELD Installation Guide: Winding Temp. Sensors
Introduction
One of the most common causes of fiber optic sensor
systems failure is a faulty installation. To ensure proper
sensor installation, this guideline should be read and fol-
lowed carefully.
LumaSense offers a unique and easy method for install-
ing fiber optic temperature sensors into power trans-
formers. This method is based on LumaSense all-dielectric
fiber-optic TC connector and on its specially grooved key
spacer Because the all-dielectric fiber optic TC connector
can be placed anywhere in the transformer, this method
eliminates the cumbersome and hazardous operation of
cable spooling and handling during installation.
The specially grooved mounting disk, unique to Luma-
sense, ensures full protection against mechanical stresses
that often cause sensor damage when installed in the
transformer key spacer. Because the sensor’s sensing tip
is held loose in the groove (see Figure 10 in the next sec-
tion), it is much less exposed to the compressive stresses
during the winding compression manufacturing step of
the power transformer.
The following guidelines cover the installation of the
temperature sensors in the winding with or without the
optional mounting disk.
Figure 1: Tip of sensor with optional factory-installed
mounting disk.
Figure 2: Overview of sensor installation in transformer tank showing the TC connectivity solution.
The following figure shows the all dielectric TC connec-
tion schematic.
Since the TC connection can be placed anywhere in the
transformer, only short fiber optic cable lengh is needed:
this avoids conveying and handling long spans of fiber-
optic cable during sensor installation and reduces the
chances of sensor damage.
Figures 3, 4, and 5 show a typical installation in the power
transformer winding.
General Overview of the TC Connectivity Solution