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Case study SMUD. TASA code 2. DRM PERFORMED ON FPE TYPE OLTC. FPE CONTROLS. DGA. Increase in Hydrogen and Methane in 2011 Indicative of hot metal gasses breaking down the oil. TASA Diagnostic Evaluation. DGA Particle count Proprietary algorithms Operating procedure

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case study smud
Case studySMUD

TASA code 2

drm performed on fpe type oltc
DRM PERFORMED ON

FPE TYPE OLTC

slide4
DGA

Increase in Hydrogen and Methane in 2011

Indicative of hot metal gasses breaking down the oil

tasa diagnostic evaluation
TASA Diagnostic Evaluation

DGA

Particle count

Proprietary algorithms

Operating procedure

Monitor for increased arcing

Evaluate for worn or damaged components

Indicated: Condition code 2

tasa comments
TASA Comments

A slightly abnormal dissipation of energy

Early indication of fault or wear activity

Heating indicated

Abnormal arcing

result
Result

TASA - identifies the wear out of the failure mode and identifies issues

DRM  - looks at the functionality timing sequence of the functional steps and identifies the abnormalities

static resistance graph of phases 1 2 3
Static Resistance Graph of Phases (1,2, & 3)

The first static resistance illustrated an issue in Phase 2

dynamic resistance graphs
Dynamic Resistance Graphs

Phase 2 – 16L to 16R

We would expect to see symmetry through the reversing switch.

Erratic behavior through the transitions

High resistance through some contacts

Problem 1

motor current graphic phase 2
Motor Current Graphic (Phase 2)

FIVE CHARACTERISTIC TRANSITIONS DIRECTION 16R-N

Phase 2

BAD

Phase1 (same for Ph.3)

GOOD

reversal switch issue
Reversal Switch Issue

When one complete side shows a problem

Reversal switch is the culprit

Phase 3 – 16L to 16R

Phase 1 - 16R to 16L

Problem 2

motor current
Motor current

The increase in motor current coincides with the squeaking noise heard during the motor operation. This could be an indication of misalignment of mechanical components.

Problem 3

slide15

S

I

M

I

L

A

R

repair

Repair

on FPE OLTC

Right After our Findings

repairs completed
Repairs Completed

Updated diverters, installed shunt straps to all 6 diverters

Replaced all arcing contacts, because of unusual cracking in face of contacts.

Re-aligned face to face mating by bending arms until flush.

Re-tensioned drive chain and drilled new pin

Replaced 2 diverter barriers

Replaced rotor bearings

Replaced stationary contact locking tabs

Replaced rotor contact nuts

before and after
Before and After

R tested from collector rings, to stationary contacts, through rotor (in milliOhms).

Tap changer operates normally in the lower range. Went through Neutral once last December.

Collector rings and contacts showed tarnish, no coking. Resistance after repair milliOhms