Automatic central monitoring of the Automatic central monitoring of the condition of VHV & EHV power condition of VHV & EHV power

tratrannsmission systemssmission systems(ACM System)(ACM System)

Trends in power industry in European context17.-18.4.2013

ČEPS, a.s., Petr Spurný, Head of Maintenance & Standardisation Concept Department

Table of contents

What is ACMPrerequisites for solutionPrincipal functionalities with examplesSummary of outputs and benefits of ACMSituation before & after the project

completionConclusions

What is ACMACM – Automatic Central Monitoring of the ACM – Automatic Central Monitoring of the

condition of VHV & EHV facilitiescondition 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 Database of dispatching control system

SAP system (equipment, technological sites,

outages/shutdowns, faults/defects, maintenance planning and results)

MST (monitoring system for

transformers)

Specialized external systems

(REGOL, EUCLID)

What is ACM – main elements

SW eSADASW 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)SW AROPO (automatic fault detection)= aautomatic detection system of detection system of deteriorated operating condition of facilities or excessive / non-operating condition of facilities or excessive / non-standard loadstandard load

Architecture and sources of data

Control System:Control System: U,I, P & Q, status (ON-OFF), time, alarms Fault recordersFault recorders: detailed analog curves (course of fault event

- analogy with oscillation-perturbation-recorder) SAP: SAP: topology and register of network facilities, records on

faults and defects, planning and evaluation of maintenance & diagnostics

System processes existing data from a control system, System processes existing data from a control system, protections, fault recorder.., no additional data are needed protections, fault recorder.., no additional data are needed

High reliability of data – it uses existing data from other High reliability of data – it uses existing data from other applicationsapplications

It is just a SW system, no additional HW or communication It is just a SW system, no additional HW or communication tools are needed tools are needed

ACM registers and monitors ACM registers and monitors allall VHV and EHV facilities VHV and EHV facilities

Sources of dataSources of data

Principal functionalities of ACM Short-termShort-term: :

• Uncovering of non-standard condition or loading of individual facilitiesUncovering of non-standard condition or loading of individual facilities

Mid-term: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:Long-term:• Monitoring of technical condition and history of equipment operation and Monitoring of technical condition and history of equipment operation and

calculation of equipment health index,calculation of equipment health index,• Determination of priorities for maintenance and recovery of network Determination of priorities for maintenance and recovery of network

operation according to the importance and rate of riskoperation according to the importance and rate of risk

Modules for fault detection MODULE PRURAZ [BREAKDOWN]MODULE PRURAZ [BREAKDOWN]: Detection

of breakdowns of circuit breakers in switching-off (11 cases detected at 9 circuit breakers, 4 of them have been replaced)

MODULE PRESTMODULE PREST: Detection of pre-ignition of circuit breakers in switching-on (1 c.b. detected)

MODULE QMCASMODULE QMCAS: Detection of intolerable delay of functions between circuit breaker poles (4 circuit breakers detected – diagnostics planned for 2012)

MODULE PETANMODULE PETAN: Detection of broken-down armatures of capacitive PTN (6 cases detected, all faulty PTNs have been replaced)

MODULE FREKMODULE FREK: Fault detection of anti-resonant circuit of capacitive PTN (1 of them replaced for a new one)

Monitoring of non-standard load MODULE FERO : 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 ASYNCHRONMODULE ASYNCHRON: Detection of asynchronous switching in network and moni-toring of related load by flow-through current

MODULE SATURMODULE SATUR: Detection of saturation of PTP cores which may result in wrongful response and function of protections

MODULE PREPMODULE PREP: Monitoring of operational overvoltage and detection of overvoltage straining excessively respective insulation

MODULE NARAZ [SURGE]MODULE NARAZ [SURGE]: Monitoring of transformer loading by surge current

Monitoring of loading by short-circuit current MODULE ZKRAT [SHORT-CIRCUIT]MODULE ZKRAT [SHORT-CIRCUIT]:

Monitoring of loading by short-circuit current

MODULE VPROUD: 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

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.

Monitoring of transmission system facilities – Map of warnings

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.

Calculation of Index of Importance (ID)

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

1. 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 ACM5. 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, provision of input data for optimisation of contracts on transferred power inputs and outputs

9. Side effects – Checks and corrections in data sources Both SW and HW-based and user-intuitive opinions on all source data

Exploitation of results of ACM

Section of project implementation and Section of asset administration (Risk management)

•PLANNING OF INVESTMENTS•PLANNING OF RENOVATION

Section of secondary equipment

• Revelation of errors in setting of protections, fault recorders and control systems for substations

Other issues• CALCULATION OF KPIs (e.g. for non-availability, reliability…) • REPORTING ON TRANSFERRED POWER INPUT & OUTPUT

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

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

CENTRALISED SW eSADA (ACM)

Monitoring of operating conditions for equipment, calculations of Health and Risk Index for equipment and recommendations for maintenance

SW for AM area before the ACM project

CENTRAL SERVER

CENTRAL SERVER

Data storeIND-Ex

Dispatching SWTRIS

Faultrecorders

Monitors forpower transmission

Control systemsfor

substations

Expert SW:status of

equipment (EQ) per

DGA (REGOL)

Points in network (PM) and

equipment (EQ)

Maintenance and results of

diagnostic checks

Faults, defects and outages

SAP R/3 MODULE PM

Diagram of ACM project after its completion

Faultrecorders

Monitors forpower transmission

Data storeIND-Ex

Dispatching SWTRIS

Control systems for substations

SW for planning of shutdowns

Electronic network logbook

CENTRAL SERVER and SW

AROPO

CENTRAL SERVER and SW for data selection

CENTRALISED SW eSADA (ACM)

Monitoring of operating conditions for equipment, calculations of Health and Risk Index for equipment and recommendations for CBM and RBM

Faults, defects and outages

Faults, defects and outages

Shutdowns

Maintenance and results of diagnostic

checks

Points in network (PM)

andequipment (EQ)

Expert SW:status of

equipment (EQ) per

DGA (REGOL)

Monitoring of storm activity (EUCLID)

Module for economy of planned maintenance

Module for importance of TM (Importance index)

SAP R/3 MODULE PM

MONITORING OF EQUIPMENT

STATUS:SYSTEM ACM

Conclusions

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

ACM system is fully functional and beneficial and its operation has provided useful information

Thank you for your attentionThank you for your attentionAny questions?