Transformer Criteria - GE Kelman TRANSFIX 1.6 Installation Manual

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 −20 °C nor exceed 120 °C.
 The transformer oil is at atmospheric pressure or above (see points below).
 There are separate supply and return valves available for connection.
 The condition of the transformer supply and return valves must allow a secure
long-term connection to the product. The valve size should measure at least
15 mm (½ in.) in diameter.
 The ambient temperature in the area where the product resides should not fall
below −40 °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 install the product on an energised transformer that is under vacuum.
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-001 – TRANSFIX-family Installation Manual – Rev 3.0 18-Jan-16 Page 12 of 55