Determining where to install a Hydran on-line incipient fault monitor on a
transformer can sometimes be challenging.
A Hydran M2-X monitor can be installed on any available transformer valve.
However, care must be taken in selecting a suitable location while respecting the
overall dimensions and weight of the monitor.
To achieve optimal performance from the Hydran monitor, it is imperative that:
• the Hydran is always mounted horizontally on the transformer valve
• there is no restriction between the Hydran and the main body of oil
• there is a good circulation of oil flowing towards the Hydran.
Figure 4-1 illustrates some typical valve locations that can be found on a
transformer. These locations vary between transformers, but there are some valve
locations on a transformer where the oil circulation is much better due to the nature
of a transformer’s operation.
The circulation of oil is generally the same in all transformers — the natural
convection of the oil circulates from warm to cool as the transformer warms up. The
oil at the bottom is usually cooler than the top as it returns from the cooling system,
as illustrated in Figure 4-1.
Figure 4-1: Typical Installation of the Hydran M2-X
Location #A: Cooling Return
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