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A flashover mark was observed in the fiber glass Actions taken to rectify the above problems:
centre shaft of the selector, between the red and
yellow phase collector rings. (Refer Figure 2) ➤ The damaged hylam bars were replaced by new
fiber glass make supports.(See Figure 4)
Figure 2: Flashover at the Shaft, Holding the odd Figure 4: Implementation of New Fibre Glass Support as
Moving Selector Contacts Replacement of Damaged Hylam Bar Support
➤ Flashover marks were also observed in the holders of ➤ The damaged collector rings were bypassed by
the moving selector contacts for all the three phases, shorting the three leads from windings for tap no.-5
as marked in Figure 3. with the neutral externally after providing proper
support. (As shown in the Figures 5 & 6).
Figure 3: Fault at the Collector Ring of Selector Chamber Figure 5: Newly Modified Neutral Connection With
Incorporation of Proper Support
26
centre shaft of the selector, between the red and
yellow phase collector rings. (Refer Figure 2) ➤ The damaged hylam bars were replaced by new
fiber glass make supports.(See Figure 4)
Figure 2: Flashover at the Shaft, Holding the odd Figure 4: Implementation of New Fibre Glass Support as
Moving Selector Contacts Replacement of Damaged Hylam Bar Support
➤ Flashover marks were also observed in the holders of ➤ The damaged collector rings were bypassed by
the moving selector contacts for all the three phases, shorting the three leads from windings for tap no.-5
as marked in Figure 3. with the neutral externally after providing proper
support. (As shown in the Figures 5 & 6).
Figure 3: Fault at the Collector Ring of Selector Chamber Figure 5: Newly Modified Neutral Connection With
Incorporation of Proper Support
26
