Automatic central monitoring of the
condition of VHV & EHV power
transmission systems
(ACM System)
Trends in power industry in European context
17.-18.4.2013
ČEPS, a.s., Petr Spurný, Head of Maintenance & Standardisation
Concept Department
Table of contents
 What is ACM
 Prerequisites for solution
 Principal functionalities with examples
 Summary of outputs and benefits of ACM
 Situation before & after the project
completion
 Conclusions
What is ACM
ACM – Automatic Central Monitoring of the
condition of VHV & EHV facilities
•It monitors technical condition of such facilities
•It issues recommendations for further operation or
modification of content or intensity of maintenance of
such facilities
Fault recorders
SAP system (equipment,
technological sites,
outages/shutdowns, faults/defects,
maintenance planning and results)
Database of dispatching control system
MST (monitoring
system for
transformers)
Specialized
external systems
(REGOL, EUCLID)
What is ACM – main elements
SW eSADA
= simple and user-friendly system for searching in
the database of central information system (SAP) and
in results of monitoring
= an active analytical and calculating system for the
control and evaluation of operation and
recommendations for maintenance
SW AROPO (automatic fault detection)
= automatic detection system of deteriorated
operating condition of facilities or excessive / nonstandard load
Architecture and sources of data
 System processes existing data from a control system,
protections, fault recorder.., no additional data are needed
 High reliability of data – it uses existing data from other
applications
 It is just a SW system, no additional HW or communication
tools are needed
 ACM registers and monitors all VHV and EHV facilities
Sources of data
 Control System: U,I, P & Q, status (ON-OFF), time, alarms
 Fault recorders: detailed analog curves (course of fault event
- analogy with oscillation-perturbation-recorder)
 SAP: topology and register of network facilities, records on
faults and defects, planning and evaluation of maintenance &
diagnostics
Principal functionalities of ACM
Short-term:
• Uncovering of non-standard condition or loading of individual facilities
Mid-term:
• Monitoring of loading and overloading of facilities
• Monitoring of failure rate and calculation of reliability parameters (including
modelling of degradation curves),
• Calculation of non-availability of network or its parts,
• Evaluation of [power] inputs and outputs at transfer points,
• Monitoring and evaluation of actual overloading in network,
• Processing of data on Voltage and R-fields for the determination of limit
loadability of DŘ,
• Modelling of maintenance strategy and planning to upkeep proper
performance
Long-term:
• Monitoring of technical condition and history of equipment operation and
calculation of equipment health index,
• Determination of priorities for maintenance and recovery of network
operation according to the importance and rate of risk
Modules for fault detection
 MODULE PRURAZ [BREAKDOWN]: Detection
of breakdowns of circuit breakers in switchingoff (11 cases detected at 9 circuit breakers, 4 of
them have been replaced)
 MODULE PREST: Detection of pre-ignition of
circuit breakers in switching-on (1 c.b. detected)
 MODULE QMCAS: Detection of intolerable
delay of functions between circuit breaker poles
(4 circuit breakers detected – diagnostics
planned for 2012)
 MODULE PETAN: Detection of broken-down
armatures of capacitive PTN (6 cases detected,
all faulty PTNs have been replaced)
 MODULE FREK: Fault detection of antiresonant circuit of capacitive PTN (1 of them
replaced for a new one)
Monitoring of non-standard load
 MODULE FERO : Detection of ferro-resonant
condition in network (15 fields at substations
detected, 1 of them repaired by changing its
physical arrangement, rest of them by
modifying their switching sequence)
 MODULE ASYNCHRON: Detection of
asynchronous switching in network and monitoring of related load by flow-through current
 MODULE SATUR: Detection of saturation of
PTP cores which may result in wrongful
response and function of protections
 MODULE PREP: Monitoring of operational
overvoltage and detection of overvoltage
straining excessively respective insulation
 MODULE NARAZ [SURGE]: Monitoring of
transformer loading by surge current
Monitoring of loading by short-circuit current
 MODULE ZKRAT [SHORT-CIRCUIT]:
Monitoring of loading by short-circuit
current
 MODULE VPROUD: Monitoring of
currents switched off by a circuit
breaker – calculation of ∑i2t and
comparison with a limit value
Example for a circuit breaker type 3AQ2EI 420 kV in the variant “Etzenricht”…
Index of Health (or a good technical condition)
IoH [IZ] is based on:






Age of facilities (W1) Group index - attaining values between 1 & 4
Cumulative load of facilities (W2) Group index - attaining values between 1 & 4
Actual condition of facilities (W3) Group index - attaining values between 1 & 4
Operational history of facilities (W4) Group index - attaining values between 1 & 4
History of technological model (W5) Group index - attaining values between 1 & 4
Model sustainability and reparability (W6) Group index- attaining values between 1&4
Total normalized Index of Health IZnorm: (attaining values between 25 & 100)
Basic visualisation of Index of Health
Monitoring of transmission system facilities – Map of warnings
Index of Health can be used for the issue of decision on expected reliability, repair,
replacement or rejection of respective facility (characterised by colour symbols on the
map). Index of Health thus represents a basis for the way and intensity of maintenance.
Calculation of Index of Importance (ID)
Principles for determination of ID:
A. Decisive factors for calculation are “Primary and derived weighting
objects” with boundaries given by protection switching-off algorithms.
B. Individual primary weighting objects (lines, transformers and chokes) are
considered based on the importance of their fault (or failure) on:
• neighbouring object (16 criteria)
• proper Transmission System (8 criteria)
C. Weights of individual impacts from the item B) are determined by a group
of experts of ČEPS [Czech Power Transmission System] using
importance factors assigned with the help of a questionnaire
D. Weights of derived objects (all parts of substations) are determined by a
calculation from primary weighting objects
E. Each item of equipment takes on itself the weight of that weighting object
in which it actually is installed and the calculation also assumes the time
period needed for the restoration of power transmission at a given place.
Summary of outputs and benefits of ACM
1.
Prevention of faults / failures of Transmission System
equipment (prevention of outages of transmission objects)
2.
Provision of data for analysis of reasons of faults of
Transmission System equipment, (in most cases, it makes possible
to find reasons for such faults, to negotiate with manufacturers (including customer
complaints) and to prevent any similar faults in the future)
3.
Calculation of (non)availability of individual parts of
networks
including provision of data for the solution of reasons of TS outages – in particular
successful repair interventions
4.
Provision of input data and recommendations for
planning of replacements (restoration) of TS equipment
including optimisation of service life in relation to estimated service life time (ESLT)
of appropriate groups of equipment
Summary of outputs and benefits of ACM
5. Creation of recommendations for planning of
maintenance of Transmission System equipment and
for modelling of costs of various strategies
6.
Determination of limits for loading of Transmission
System objects [items] for dispatching control
7.
Provision of input data for risk management in ČEPS,
a.s.
8.
Checks of power inputs and outputs in transfer points,
9.
Side effects – Checks and corrections in data sources
provision of input data for optimisation of contracts on transferred power inputs
and outputs
Both SW and HW-based and user-intuitive opinions on all source data
Exploitation of results of ACM
Section of operation/maintenance, Section of asset management
• REVELATION OF FAULTS AND INITIATION OF REPAIR WORK
• INITIATION OF CHANGES IN PREVENTIVE MAINTENANCE
CODE & EXTRAORDINARY MAINTENANCE/DIAGNOSTIC
PLAN
• DETERMINATION OF ORDER OF IMPORTANCE OF
MAINTENANCE OPERATIONS
• MAINTENANCE COST MODELLING
• Revelation of errors in power transmission monitor functions
• Revelation of errors in Central SAP System
Section of project implementation and
Section of asset administration (Risk
management)
•PLANNING OF INVESTMENTS
•PLANNING OF RENOVATION
CENTRALISED SW eSADA (ACM)
Monitoring of operating conditions for equipment, calculations of Health and
Risk Index for equipment and recommendations for maintenance
Section of secondary equipment
• Revelation of errors in setting of
protections, fault recorders and control
systems for substations
Dispatching
• CALCULATION OF LIMIT VALUES FOR LOADING
• Revelation of errors in setting of control systems for
substations, faults in data transfers to the control
centre & faults in network logbook
Other issues
• CALCULATION OF KPIs (e.g. for non-availability, reliability…)
• REPORTING ON TRANSFERRED POWER INPUT & OUTPUT
SW for AM area before the ACM project
CENTRAL
SERVER
Expert SW:
status of
equipment
(EQ) per
DGA
(REGOL)
SAP R/3 MODULE PM
CENTRAL
SERVER
Data store
IND-Ex
Points in network
(PM) and
equipment (EQ)
Dispatching SW
TRIS
Fault
recorders
Monitors for
power transmission
Control systems
for
substations
Maintenance
and results of
diagnostic
checks
Faults, defects
and outages
Diagram of ACM project after its completion
Monitoring of storm
activity (EUCLID)
Module for economy of
planned maintenance
Module for importance of
TM (Importance index)
Expert SW:
status of
equipment
(EQ) per
DGA
(REGOL)
SAP R/3 MODULE PM
Points in
network (PM)
and
equipment (EQ)
Faults,
Faults, defects
defects
and
outages
and outages
Maintenance and
results of
diagnostic
checks
Shutdowns
CENTRALISED SW eSADA (ACM)
Monitoring of operating conditions for equipment, calculations of Health and
Risk Index for equipment and recommendations for CBM and RBM
CENTRAL
SERVER and SW
AROPO
CENTRAL
SERVER and SW
for data selection
Data store
IND-Ex
Electronic
network logbook
Dispatching SW
TRIS
Fault
recorders
Monitors for
power transmission
Control
systems for
substations
SW for
planning of
shutdowns
MONITORING
OF EQUIPMENT
STATUS:
SYSTEM ACM
Conclusions
ACM system is fully functional and beneficial and
its operation has provided useful information
FURTHER PROGRESS
•“Fine tuning” of completed parts in compliance with actual results from real
operation
•System maintenance with regard to new equipment installed / replaced in TS
•Development of new functionalities (e.g. automatic monitoring of insulation
condition, inclusion of results of aerial inspections of transmission lines, …)
•Creation of a new subsystem LINE which would combine data from
maintenance findings with registered data and available information from ACM
•Support of maintenance planning based on the actual condition of the
equipment from the point of view of both the content and costs of maintenance
Thank you for your attention
Any questions?