View
241
Download
0
Category
Preview:
Citation preview
7/30/2019 UNITEN ARSEPE 08 L16
1/56
MV Switchgear
2008-02-18 ARSEPE 2008 Malaysia 1
Basic Requirements for
Developing a Condition BasedMaintenance (CBM) Plan.Hardanjit S. Gosal hardanjit@tnb.com.my
7/30/2019 UNITEN ARSEPE 08 L16
2/56
Why do we need to maintain aswitchgear?
To preserve its primary functionsTo improve its availability
ARSEPE 2008 Malaysia 22008-02-18
next failureTo reduce the frequency of service
interruptions and the undesirableconsequences
7/30/2019 UNITEN ARSEPE 08 L16
3/56
Maintenance has a majorimpact on -
Component and System ReliabilityIf too little is done
Hi her number of failures
ARSEPE 2008 Malaysia 32008-02-18
Poor system reliability
If done regularly at fixed time intervalsReliability will improveCost will increase sharply
7/30/2019 UNITEN ARSEPE 08 L16
4/56
Maintenance of SwitchgearsDeserves Special Consideration
Importance for routine switchingProtection of other primary equipment &
ARSEPE 2008 Malaysia 42008-02-18
May remain idle in either OPEN orCLOSED positions for long periods of time
7/30/2019 UNITEN ARSEPE 08 L16
5/56
Examples of switchgear failures
ARSEPE 2008 Malaysia 52008-02-18
7/30/2019 UNITEN ARSEPE 08 L16
6/56
Examples of switchgear failures
ARSEPE 2008 Malaysia 62008-02-18
7/30/2019 UNITEN ARSEPE 08 L16
7/56
Examples of switchgear failures
ARSEPE 2008 Malaysia 72008-02-18
7/30/2019 UNITEN ARSEPE 08 L16
8/56
Examples of switchgear failures
ARSEPE 2008 Malaysia 82008-02-18
7/30/2019 UNITEN ARSEPE 08 L16
9/56
What is Condition BasedMaintenance?
Also known as Predictive MaintenanceIt relies on knowing the condition ofindividual pieces of equipment
ARSEPE 2008 Malaysia 92008-02-18
It includes:
monitoring equipment parameterstesting on a periodic basis and/or whenproblems are suspectedData analysis and data management
7/30/2019 UNITEN ARSEPE 08 L16
10/56
What is Condition BasedMaintenance?
Results in knowledgeable maintenancedecisions which would reduce overallcosts b focusin onl on e ui ment that
ARSEPE 2008 Malaysia 102008-02-18
really needs attention
7/30/2019 UNITEN ARSEPE 08 L16
11/56
Drawbacks:
Some parameters are very difficult andexpensive to monitor
ARSEPE 2008 Malaysia 112008-02-18
analysis to be effectiveCondition monitoring equipment and
systems need to be maintained andcalibrated
7/30/2019 UNITEN ARSEPE 08 L16
12/56
In summary, CBM is:A cost-effective maintenance scheme whereSystem Reliability and Maintenance Cost are
balanced.A methodology that comes under the broadera roach of RCM
ARSEPE 2008 Malaysia 122008-02-18
In RCM approach, various alternative maintenancepolicies are compared and the most cost-effectivefor sustaining equipment reliability is selected.
It is nearly impossible to apply a condition basedmaintenance program to the entire distributionnetwork.
7/30/2019 UNITEN ARSEPE 08 L16
13/56
Asset Maintenance Strategy
TNB Distribution Division strategy is apractical approach. It is a hybrid i.e. acombination of Condition Based Maintenance
ARSEPE 2008 Malaysia 132008-02-18
.CBM will be applied to key and critical primaryequipment that has an impact on systemreliability such as:
1. Power Transformers2. Switchgears3. MV UG Cable Feeders
7/30/2019 UNITEN ARSEPE 08 L16
14/56
Asset Maintenance Strategy
PM will continued to be applied to:1. LV UG Cable Feeders2. LV Equipment
ARSEPE 2008 Malaysia 142008-02-18
3. LV OH Line Feeders4. MV OH Line Feeders5. DC Battery Banks
7/30/2019 UNITEN ARSEPE 08 L16
15/56
How to initiate a CBM Program?
The migration from a purely PM program to CBMis not an easy one. Listed below are some basicsteps that are required to initiate a CBM program:
ARSEPE 2008 Malaysia 152008-02-18
1. Develop a master list of all primary equipment in yournetwork
2. Prioritize the primary equipment based on theirimportance to system reliability
3. Group them according to voltage rating, type,manufacturer, age, etc
7/30/2019 UNITEN ARSEPE 08 L16
16/56
How to initiate a CBM Program?
4. Determine the type & number ofmaintenance activities required andfre uenc usin :
ARSEPE 2008 Malaysia 162008-02-18
a. Manufacturer technical manualsb. Maintenance historyc. Root cause analysis findings - Why did it fail?d. Good engineering judgment
7/30/2019 UNITEN ARSEPE 08 L16
17/56
How to initiate a CBM Program?
5. Assess the size of your maintenance staff.6. Identify tasks that may be performed by your
operations maintenance personnel and those
ARSEPE 2008 Malaysia 172008-02-18
that can be outsourced to service providers.7. Analyze equipment failure modes and effects
(FMECA).
8. Identify effective maintenance tasks ormitigation strategies.
7/30/2019 UNITEN ARSEPE 08 L16
18/56
FMECAThe FMECA (Failure mode, Effects and CriticalityAnalysis methodology is employed in TNB Distribution toidentify potential failures. For the switchgear or system,assess the risk associated with those failure modes, rankthe issues in terms of importance and identify and carryout corrective actions to address the most serious
ARSEPE 2008 Malaysia 182008-02-18
concerns:All potential failure modes of the various components ofa systemThe effects these failures may have on the system
How to avoid and/or mitigate the effects of the failures onthe system
7/30/2019 UNITEN ARSEPE 08 L16
19/56
Standards Related to FMECA
FMECA standards are:MIL-STD 1629 Procedures for erformin a
ARSEPE 2008 Malaysia 192008-02-18
failure mode and effect analysisIEC 60812 Procedures for failure mode andeffect analysis (FMEA)
BS 5760-5 Guide to failure modes, effects andcriticality analysis (FMEA and FMECA)
7/30/2019 UNITEN ARSEPE 08 L16
20/56
Pre-requisites of FMECA
1. Defining the system to be analyzed and dividing it intomanageable units called functional elements.2. Collecting available information that describes the
system to be analyzed; including-drawings,
ARSEPE 2008 Malaysia 202008-02-18
specifications, schematics, component lists, interfaceinformation and functional descriptions.3. Collecting information about previous and similar
designs through interviews with design personnel,
operations and maintenance personnel and componentsuppliers.
7/30/2019 UNITEN ARSEPE 08 L16
21/56
Limitations of FMECA
In spite of being so popular FMECA alsohas downsides and they are:
ARSEPE 2008 Malaysia 212008-02-18
, -expensive process.It is not suitable for multiple failures.
7/30/2019 UNITEN ARSEPE 08 L16
22/56
Sample of FMECA
From FMECA:We identified the test techniques andtechnologies to be adopted for CBM of
ARSEPE 2008 Malaysia 222008-02-18
switchgearsDeveloped Acceptance CriteriaDeveloped a Switchgear Maintenance Manual
Developed a Frequency & Maintenance Matrix
7/30/2019 UNITEN ARSEPE 08 L16
23/56
What is in the manual?
Maintenance ManagementCategorisation of AssetsSafety Procedures
ARSEPE 2008 Malaysia 232008-02-18
-Commissioning ProceduresMaintenance Servicing ProceduresPost-breakdown ProceduresTest Equipment RequirementsData Analysis & Trending
7/30/2019 UNITEN ARSEPE 08 L16
24/56
Application
Air Insulated Switchgear (AIS) VCB,OCB, GCB.
ARSEPE 2008 Malaysia 242008-02-18
Ring Main Units (RMU) Oil , SF6.Outdoor Switchgear OCB, VCB.
7/30/2019 UNITEN ARSEPE 08 L16
25/56
Servicing MatrixNo. Test Classification
Routine Diagnostic AdvanceDiagnostic
In-house Out-sourced
1 Physical Audit
2 IR Thermography
3 Ultrasound
ARSEPE 2008 Malaysia 252008-02-18
4 PD Measurement
5 Gas Purity TNBR Lab
6 Gas Dew-point
7 Gas Leakage
8 Contact resistance
7/30/2019 UNITEN ARSEPE 08 L16
26/56
Servicing MatrixNo. Test Classification
Routine Diagnostic AdvanceDiagnostic
In-house Out-sourced
9 Timing & Travelinclusive of first trip
10 Vacuum Check
11 Contact Erosion & Ad ustment
ARSEPE 2008 Malaysia 262008-02-18
12 Oil Dielectric
13 HV Dielectric Test
14 Insulation Resistance
15 Tan Delta (DDF)
16 CT & VT Test
7/30/2019 UNITEN ARSEPE 08 L16
27/56
Servicing MatrixNo. Test Classification
Routine Diagnostic AdvanceDiagnostic
In-house Out-sourced
17 Mechanical Functional Check
ARSEPE 2008 Malaysia 272008-02-18
18 Electrical Functional Check
19 Interlocks
20 Gas Pressure
21 Temperature Scan
7/30/2019 UNITEN ARSEPE 08 L16
28/56
CMMSA computerized maintenance management system(CMMS) is a type of management software that performsfunctions in support of management and tracking ofO&M activities.
ARSEPE 2008 Malaysia 282008-02-18
CMMS systems automate most of the logistical functionsperformed by maintenance staff and management.CMMS systems come with many options and have manyadvantages over manual maintenance tracking systems.
A CMMS is being developed by TNB Research for TNB-Distribution Divisions CBM Program.
7/30/2019 UNITEN ARSEPE 08 L16
29/56
tnb distribution division : condition based maintenance program
1
7/30/2019 UNITEN ARSEPE 08 L16
30/56
MaintenanceAction
MaintenanceManual
Module 1
Module 2Repository of all maintenance procedures,manuals, guidelines etc.
Tracking and recording of all maintenance actionson each equipment
TNB Research Involve to Solve
Test Results
Decision Support
Maintenance
Planning
Module 3
Module 4
Module 5
Collation of all maintenance test results of all equipments
CBM actions, determining maintenance intervals
Levels of authority2
7/30/2019 UNITEN ARSEPE 08 L16
31/56
Maintenance work orders (generated thruERMS)Date / Time start / endResponsible person
TNB Research Involve to Solve
maintenance actions (maintenance testsheets)
FindingsClosing of maintenance work orders
3
7/30/2019 UNITEN ARSEPE 08 L16
32/56
Related PSI documentsEquipment ManualsProceduresGuidelines
TNB Research Involve to Solve
Distribution DivisionStored in a central server and available on
demandLinked to Maintenance Action Module
4
7/30/2019 UNITEN ARSEPE 08 L16
33/56
Similar to Patients Medical RecordLinked to Maintenance Action moduleAble to list categories, tabulate resultsGenerate charts and graphs, look for
TNB Research Involve to Solve
Used for technical analysis
5
7/30/2019 UNITEN ARSEPE 08 L16
34/56
High level prognostic and diagnostic capabilityEvaluate what next scenariosIncorporate risk-based analysis
TNB Research Involve to Solve
Expert system capabilityPrioritise maintenance actionsMake use of database of maintenanceexperience, previous test results, previousfailures, maintenance costs etc.
6
7/30/2019 UNITEN ARSEPE 08 L16
35/56
Linked to current ERMS SAP-PM ModuleList of possible maintenance actionsAccept / Reject output from Decision Support
TNB Research Involve to Solve
ModuleAdd maintenance actions (if required)Prioritise Maintenance Action
Generate work order via ERMS
7
7/30/2019 UNITEN ARSEPE 08 L16
36/56
TNB Research Involve to Solve 8
7/30/2019 UNITEN ARSEPE 08 L16
37/56
TNB Research Involve to Solve 9
7/30/2019 UNITEN ARSEPE 08 L16
38/56
TNB Research Involve to Solve 10
7/30/2019 UNITEN ARSEPE 08 L16
39/56
TNB Research Involve to Solve 11
7/30/2019 UNITEN ARSEPE 08 L16
40/56
TNB Research Involve to Solve 12
7/30/2019 UNITEN ARSEPE 08 L16
41/56
TNB Research Involve to Solve 13
7/30/2019 UNITEN ARSEPE 08 L16
42/56
TNB Research Involve to Solve 14
7/30/2019 UNITEN ARSEPE 08 L16
43/56
TNB Research Involve to Solve 15
7/30/2019 UNITEN ARSEPE 08 L16
44/56
TNB Research Involve to Solve 16
7/30/2019 UNITEN ARSEPE 08 L16
45/56
TNB Research Involve to Solve 17
7/30/2019 UNITEN ARSEPE 08 L16
46/56
TNB Research Involve to Solve 18
7/30/2019 UNITEN ARSEPE 08 L16
47/56
TNB Research Involve to Solve 19
7/30/2019 UNITEN ARSEPE 08 L16
48/56
TNB Research Involve to Solve 20
7/30/2019 UNITEN ARSEPE 08 L16
49/56
TNB Research Involve to Solve 21
7/30/2019 UNITEN ARSEPE 08 L16
50/56
TNB Research Involve to Solve 22
7/30/2019 UNITEN ARSEPE 08 L16
51/56
TNB Research Involve to Solve 23
7/30/2019 UNITEN ARSEPE 08 L16
52/56
TNB Research Involve to Solve 24
7/30/2019 UNITEN ARSEPE 08 L16
53/56
TNB Research Involve to Solve 25
7/30/2019 UNITEN ARSEPE 08 L16
54/56
TNB Research Involve to Solve 26
7/30/2019 UNITEN ARSEPE 08 L16
55/56
TNB Research Involve to Solve 27
7/30/2019 UNITEN ARSEPE 08 L16
56/56
TNB Research Involve to Solve
azrin@tnb.com.my
28
Recommended