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6
TRANSFORMER CRITERIA
The transformer shall meet the following criteria:
▪
The transformer contains mineral type oils (paraffinic or naphthenic) that meet the
requirements of IEC 60296, BS EN 60296, VDE 0370 or ASTM D 3487.
▪
The transformer oil must be certified PCB free.
▪
The temperature of the oil at the outlet valve of the transformer should not fall below
−10 °C nor exceed 100 °C.
▪
The transformer oil is at atmospheric pressure or above (see points below).
▪
There are separate return and supply valves available for connection.
▪
The ambient temperature in the area where the product resides should not fall below
−35 °C nor exceed 55 °C.
If the transformer is nitrogen blanketed, check the pressure/vacuum gauge. If
the pressure is positive, then the product can be installed. If the pressure is
negative, a vacuum exists within the transformer. Air will be drawn into the
transformer when a valve is opened. Air bubbles could be damaging to the
transformer if the transformer is energised.
Do not
Dielectric fittings are a safety measure to prevent circulating currents from
flowing in the tubing circuits whenever a transformer is not grounded to the
same point as the monitoring product. Customers should consult with their
local tubing supplier to source suitable dielectric fittings if required.
MA-005 - Minitrans Installation Manual - Rev 4.5
install the product on an energised transformer that is under vacuum.
13-Aug-20
Page 14 of 86
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