Flash and fire points
Relatively small percentages (2-3%) of transformer oil or
contaminants may substantially reduce the flash and fire
point of R-Temp fluid. If it is suspected that the fluid may
have been exposed to contamination, the flash and fire
point should be measured in accordance with ASTM D-92.
A fire point lower than 300°C probably indicates some
contamination by lower fire point material. If flash or fire
points fall below the minimum values required, retrofilling
may be required.
Drain and refill
If it is necessary to drain and refill the transformer, special
care should be taken to avoid the entrapment of gas
bubbles in the system. Sufficient time should be allowed
between refilling and energization of the transformer to be
sure that any gas bubbles created during the process have
dissipated.
Contact your Eaton representative for additional handling
guidelines.
PEAK™ and Envirotemp™ FR3™ fluid-filled
transformers
Periodic maintenance should be performed on the
same schedule as would be used for units of similar
application filled with transformer oil. The same type of
sampling techniques should be used (ASTM-D923). Basic
recommended tests for Envirotemp™ FR3™ fluid are
dielectric strength, moisture content and flash and fire
points.
Acceptance values should meet or exceed those shown in
IEC 61203, "Guide for Maintenance of Transformer Esters in
Equipment".
CAUTION
When the insulating fluid temperature is less than –10ºC
(14ºF), no-load tap changers and energized loadbreak
switches should not be operated and the Bay-O-Net
fuses should not be used to make or break a load.
(Operations at lower temperatures may be possible
provided it is certified by the switching device
manufacturer for loadbreak operation in Envirotemp™
FR3™ fluid at lower temperatures.)
If the transformer cover or manhole must be removed
for internal service, exposure time to ambient air should
be minimal. Avoid exposure times greater than 24 hours.
Immediately after service is completed, replace the cover or
manhole. Then, purge and recharge the headspace with dry
nitrogen.
The procedure for recharging the headspace with nitrogen
should include the following steps:
1. Fill headspace with dry nitrogen to a pressure of 2-3
psig.
2. Vent headspace to atmospheric pressure.
3. Refill headspace with nitrogen to 2-3 psig.
4. Verify that the unit is hermetically sealed.
If the manhole cover or non-flapper style Bay-O-Net fuses
are removed for more than 24 hours, any oxygen absorber
packet(s) should be replaced.
Transformer oil contamination
Envirotemp™ FR3™ fluid is fully miscible with oil. There
is no known detrimental performance impact when
Envirotemp™ FR3™ fluid is mixed with mineral oil.
Conversely, except for some reduction in flash and fire
points, the same is true for oil mixed in with Envirotemp™
FR3™ fluid. More than 7% mineral oil in Envirotemp™
FR3™ fluid is required to drop the fire point to below
300ºC. To maintain its exceptional environmental
classification, contamination of Envirotemp™ FR3™
dielectric coolant by any other fluids should be avoided.
Contact your Eaton representative for additional handling
guidelines.
Spare parts and service
We suggest that you keep one spare set of gaskets for
the manhole and any gasket-type bushings used. Other
renewal parts may be ordered through your local factory
representative. When replacing components, including
gaskets, on a PEAK transformer ensure they are rated for
PEAK level operating temperatures. When ordering parts or
requesting service, provide a complete description of the
part or the problem and the complete transformer serial
number as listed on the nameplate.
15SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016
To Next Page
Loading...
Need help?
General
