Hardened inductive device and systems and methods for protecting the inductive device from catastrophic events
View Patent ↗A hardened inductive device and systems and methods for protecting the inductive device from impact is provided. The inductive device is hardened with protective coating and/or an armor steel housing. The hardened inductive device is protected from impact by an object such as a bullet and leakage of dielectric fluid is prevented. Acoustic and vibration sensors are provided to detect the presence and impact, respectively, of an object in relation to the inductive device housing. The measurements of the acoustic and vibration sensors are compared to thresholds for sending alarms to the network control center and initiating shut-down and other sequences to protect the active part. The acoustic sensor results are utilized to determine the location of origin of the projectile.
1. An inductive device comprising: a tank with top, bottom and side walls, and wherein each said side wall has an outer substrate surface; a core having at least one core limb extending between a pair of yokes, at least one coil assembly mounted to the at least one core limb, and an insulating medium disposed in an internal volume of said tank; and a coating layer bonded to said tank side wall outer substrate surfaces, and wherein said coating is a polyurea coating upon reaction, said polyurea coating formed of first and second components prior to reaction, comprising: a first component comprising a member selected from the group consisting of an aromatic diisocyanate and an aliphatic diisocyanate; and a second component comprising a polyamine.
2. The inductive device of claim 1 wherein the core has a non-magnetic gap in the at least one core limb.
3. The inductive device of claim 1 wherein the coating first component comprises from 0.1 to 50 percent by weight of isocyanates and the coating layer second component comprises from about 50 percent to about 75 percent by weight of amines and the coating second component comprises from about 50 percent to about 75 percent by weight of amines.
4. The inductive device of claim 1 wherein the coating first component comprises from 0.1 percent to 45 percent diphenylmethane-4,4′-diisocyanate by weight and from about 0.1 percent to 5 percent methylene diphenyl diisocyanate by weight.
5. The inductive device of claim 1 wherein the coating second component comprises diethylmethylbenzenediamine and alpha-(2-Aminomethylethyl)-omega-(2-aminomethylethoxy)-poly(oxy(methyl-1,-2-ethanediyl)).
6. The inductive device of claim 1 wherein the coating first component comprises from about 30 percent to about 60 percent by weight of isocyanates and from about 5 percent to about 15 percent by weight of propylene carbonate and wherein the coating second component amine mixture comprises from about 61 percent to about 89 percent by weight polyoxypropylenediamine.
7. The inductive device of claim 1 wherein the first and second components are applied to the tank wall surfaces in a 1:1 volumetric ratio.
8. The inductive device of claim 1 wherein the tank walls are formed of a metal having a chemical composition comprising by weight:
0%.Itoreq.carbon.Itoreq.0.29%; 0.85%.Itoreq.manganese.Itoreq.1.35%;
0%.Itoreq.phosphorous.Itoreq.0.04%; 0%.Itoreq.sulfur.Itoreq.0.05%;
0%.Itoreq.silicon.Itoreq.0.4%; at least 0.2% copper; and the remainder being comprised by iron.
9. The inductive device of claim 1 wherein the tank material is comprised of a chemical composition by weight percent based on total weight of the following elements: 0.30% carbon; 1.70% manganese; 0.70% silicon; 1.00% chromium; 0.8% nickel; 0.5% molybdenum; and 0.004% boron.
10. The inductive device of claim 1 wherein a coating thickness is from about 0.25 inches to about 0.75 inches.
11. The inductive device of claim 1 wherein a thickness of the side walls is from about 0.375 inches to about 1.25 inches.
12. The inductive device of claim 1 wherein a reduction in core noise level of from about 0.1 dB to about 4.3 dB during operation of the inductive device is experienced for the inductive device having a layer of said polyurea coating in comparison to an uncoated inductive device.
13. The inductive device of claim 1 wherein said polyurea coating layer prevents leakage of dielectric fluid through openings from about 0.001 mm to about 12.7 mm in diameter.
14. The inductive device of claim 1 wherein the coating is applied to outer surfaces of a barrier formed of connected plates surrounding a member selected from the group consisting of ONAN cooler, OFAF cooler, radiator, conservator, valve, hose, tap changer, gauge, sensor, instruments and control panel.
15. The inductive device of claim 1 wherein the coating protects the tank walls from penetration by an object.
16. The inductive device of claim 1 wherein a shore D durometer hardness of the coating is from about 50 to about 61.
17. The inductive device of claim 1 wherein the tank has at least one stiffener attached to each of the side walls and plates attached to each of the stiffeners, the plates being arranged to surround the inductive device tank.
18. The inductive device of claim 17 wherein the coating is applied in a layer to the outside surface of each plate.
19. The inductive device of claim 1 having a cooling system comprising a radiator bank proximate to each of two opposing side walls of the inductive device tank, and wherein each radiator bank has a top wall, a bottom wall and side walls and at least one fan; and wherein a plate is attached to each of opposing side walls of the cooling system and the coating is bonded to outer substrate surfaces of the plates.