Table 1.
Research on transformer maintenance strategy.
Table 2.
Research on RPN in the field of transformers.
Fig 1.
Method structure-calculate maintenance interval based on Bayesian and RPN.
Table 3.
OMCR criteria.
Table 4.
OPR criteria.
Table 5.
ESR criteria.
Table 6.
DDR criteria.
Table 7.
Example rating.
Fig 2.
Risk ranking example.
Table 8.
Failure occurrence time data.
Fig 3.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d) abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) heating.
Fig 4.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d) abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) heating.
Table 9.
Specific parameters of the prior and posterior distributions.
Table 10.
MCMC convergence results.
Table 11.
Failure probability.
Fig 5.
Failure probability prediction chart.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d) abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) heating.
Table 12.
Weight table of influencing factors.
Table 13.
Decision matrix.
Table 14.
Fusion weight table of influencing factors.
Fig 6.
Weight distribution chart.
Fig 7.
Weight stability chart.
Fig 8.
Safety factor results.
Table 15.
Maintenance strategy results table.
Fig 9.
20 year cumulative cost comparison chart.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d)abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) heating.
Fig 10.
20 year total cost comparison chart.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d)abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) heating.
Fig 11.
(a) power failure; (b) heater damage; (c) no-load closing failure; (d)abnormal operation of the fan; (e) damaged rainproof measures; (f) light gas transmission; (g) oil leakage; (h) oil seepage; (i) cheating.