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Coupling device 604 allows for physical attachment to the transformer case 106, limiting excessive movement, while still allowing for the sensor to be suspended in the transform oil, and also allows for acoustic isolation from the transformer case 106. Suitably, the fiber optic acoustic sensor 602 is physically coupled to the transformer case 106 via a coupling device 604. In embodiments, the system 600 is appropriately attached, mounted, placed or otherwise associated with a transformer 100, so as to allow an optical fiber 602 of the fiber optic acoustic sensor to enter the transformer 100, and suitably be positioned within the transformer oil 110. 6 shows a suitable implementation of the various systems described herein in the field to monitor a power transformer 100. Additional dissolvable jackets can comprise for example, lipids.įIG. Exemplary dissolvable jackets suitably comprise solid paraffin wax, for example. Exemplary dissolvable jackets suitable comprise a hydrocarbon that is solid at room temperature (and up to normal air temperature, e.g., 80-100° C.), but dissolves in transformer oil and/or at an elevated temperature, but such that the dissolution does not negatively impact the composition of the transformer oil. Utilizing a dissolvable jacket as described herein provides a mechanism such that, when placed in transformer oil, the jacket dissolves (either partially or completely) so as to effectively clean any debris from the surface of the fiber, and also to removing any defective jacket, revealing the protected fiber underneath, that is now in direct contact with the transformer oil. In addition, nicks or cuts can also occur to the jacket, creating defects. During handling and installation, dirt, debris, fingerprints, etc., can find their way on to the jacket of the optical fiber, providing potential sites at which a partial discharge can occur. The use of a dissolvable jacket provides a mechanism for effectively “self-cleaning” the optical fiber after placement in a transformer oil. a coating surrounding the fiber-this can be a gel, solid or semi-solid coating). In suitable embodiments, the systems further comprise a dissolvable jacket surrounding the optical fiber (i.e. Exemplary dissolvable jackets suitable comprise a.