He began his career at one of the largest electric utilities in north america as a high voltage underground. Important improvements can be achieved considering the real condition of parts based on direct measurement or estimation from actual usage, which represents a best maintenance practice. The pm strategy known as condition based maintenance cbm provides a dynamic understanding of equipment condition while in operation and is used to predict failure in mechanical systems through fault diagnosis from condition monitoring signals using diagnostics and prognostics 6. Power cable installation guide figure f5 multiple sheaves figure f6 sheave arrangements for feeding into cable tray training radius the training radius is the final positioning of cable ends after the cable has been placed in the raceway. We express our appreciation for the support provided by psercs industrial members and by the national science foundation under grant nsf. The following details are required for calculation. In particular, cbm is highly effective where safety and reliability is the paramount concern such. Steve haddock is a utility expert in the areas of transmission lines and underground power cables with over 34 years of experience maintaining and managing transmission lines and cables equipment. High voltage xlpe cable systems technical user guide. Ieee guide for the design and installation of cable systems in substations 2.
Examining the standards and standardization proposals within the condition based maintenance cbm technology and specific within cbm systems, conclusions might be drawn as to where the technical. Introduction increasingly, utilities, developers and power. Introduction emerging challenges in the oil and gas industry are proving to be a catalyst for change in the management of facilities, new and old, worldwide. By contrast, conditionbased maintenance is not directly based on equipment age. Condition monitoring technologies can, therefore, play a vital role in attempting to target the cables that pose the most urgent reliability concerns. Less voltage drop during normal operating condition and less chance of fault. Condition based maintenance on mv cable circuits as part. Condition based maintenance allows preventive and corrective actions to be scheduled at the optimal time, thus reducing the total cost of ownership. Condition based maintenance this checks underground power transmission cables and aboveground grid fixtures like joints and terminations that have already experienced partial damage. Condition based maintenance and the use of condition based maintenance systems ensures that the condition of an item is always monitored and alarm limits can be programmed or specified to alert. Underground networks guide to maintenance practices page b03. Underground system design tadp 547 gonzaga university. Preventive maintenance to be carried out annually comprises.
Efforts to introduce a rational condition based maintenance programme started as early as almost two decades ago. The workshop will also benefit those working in system design as well as site commissioning, maintenance and troubleshooting. Underground power distribution underground power distribution is used by utilities in areas where overhead distribution systems are not acceptable due to physical limitations, environmental considerations, or aesthetic reasons. These limits should not be used for cables subjected to pulling tensions during installation. Condition based maintenance cbm in the oil and gas industry. Pm can be further subdivided into condition based maintenance and predetermined maintenance which implies that pm can be time based or condition based. It helps to predict when and what kind of repairs might be needed in the future, or if faulty sections need immediate replacement. Because most of an underground cable system is inaccessible, fault location can slow the restoration process.
In this paper different condition assessment methods as well as improved failure statistics for cable systems are considered. Most repair work is on the cable joint or termination, and an increasing number of. It is less liable to damage during storm or bad whether condition. Laying of underground cables the reliability of underground cable network depends to a considerable extent upon proper laying. Constructing, operating and maintaining underground. Today, improvements in technology are making it easier to gather, store and analyze data for cbm. Figure 1 cbm basic structure diagnostics condition assessment maintenance concept condition based. The desired attributes for the ideal cable condition monitoring technique are presented along with a general discussion on the various properties of electric cable insulation that can be monitored to assess the condition of an electric cable and the dielectric integrity of cable insulation systems. Condition based maintenance and monitoring software fiix.
The concept, quite correctly, is based on the belief that if equipment can be evaluated, and. The diagnostic capabilities of predictive maintenance technologies have increased in recent years with advances made in sensor technologies. Condition based maintenance on mv cable circuits as part of. A conditionbased maintenance policy for multicomponent. Through this connection one will be able to connect many sensors via a single cable or bus. Cable layout and system design the dimensioning of a high voltage cable system is always based on the specifications and demands of the project at hand. The reliability of underground cable network highly depends upon proper laying of cables, quality of cable joints and branch connections etc. There are three main methods of laying underground cables a. Mafijur rahman electrical and electronic engineer professional associates limited. High voltage underground cables i cable cable components 6 conductor 78 inner semiconductor shield 9 xlpe insulation 9 outer semiconductor shield 9 metallic screen 910 outer protective jacket 11 table of cable components 12 metallic screens earthing shortcircuit operating conditions 14 grounding methods 14. Continuous online condition monitoring of hv cable systems. Asset optimization and conditionbased maintenance cbm improving reliability and quality ann moore business development executive.
The limiting effects become very important at transmission voltages, especially 100,000 volts and above. This is one area in which underground cables can really score. But the main disadvantage of underground cable is its cost of installation. For both types of cable systems a number of variables remain constant. Predictive maintenance attempts to detect the onset of a degradation mechanism with the goal of correcting that degradation prior to signiicant deterioration in the component or equipment. Butcher 2000, defines the maintenance technology as cbm is a set of maintenance actions based on realtime or near. The growth in demand for crude oil and natural gas is unlikely to show any. The discussion is focused on transmission cables but also has relevance for distribution cable applications. For serviceaged medium voltage power cable circuits, it is realised by means of. Condition based maintenance 1996 page 3 of 11 online vs. Eventually the entire power system is included in the program and cost savings begin to multiply. General load condition installation condition 2 general a guidelines for. The choice of whether to use overhead line ohl or underground cable ugc must be made keeping in view the safety, reliability and operational constraints.
Standard for an electrical preventive maintenance epm program page 410 connections. Introducing current industrial practice and challenges article pdf available january 20 with 1,853 reads how we measure reads. A new tool for applying condition based maintenance. What are the maintenance procedures for underground. V underground cable condition assessment project justification report actewagl distribution 4 current situation in the past 5 years, reactive repairs and replacements have been increasing, see figure 1. Condition based maintenance, distribution power stations. For higher voltage the cost of cable increases due to greater requirement of insulation as. Condition based maintenance in manufacturing industries. This process will determine the asset health, and act only when maintenance is. The program has been designed according to three key concepts. It helps to predict when and what kind of repairs might be needed in. To reduce the high setup cost of maintenance, a joint maintenance interval is introduced. High voltage xlpe cable systems techincal user guide brugg cables page 6 2. Condition based maintenance cbm in the oil and gas.
Condition based maintenance cbm offers the promise of enhancing the effectiveness of maintenance programs in a way that no other single concept has ever matched. A new approach for evaluating the condition of cable. Structure of an underground cable system overhead lines can frequently been seen traversing the landscape from a long way away. Maintenance of overhead and underground electrical distribution systems posted by joseph coupal eleccomm corporations primary business is on the construction and maintenance of overhead and underground distribution systems in both electrical and telecommunications markets.
Check racking system for any movement, and the grounding and bonding system. Pdf condition based maintenance system technology where. The following describes the design criteria and assumptions used in the analysis. Implementation of conditionbased maintenance for medium. The number of extrahighvoltage alternatingcurrent ac underground cable systems installed in colombia has grown rapidly. Asset optimization and conditionbased maintenance cbm. C12 10th international conference on insulated power cables c12 jicable19 paris versailles 2327 june, 2019 1 6 a new approach for evaluating the condition of cable systems and estimation of remaining life time of mv underground power cables. Pdf technical design of condition based maintenance system. Maintenance of overhead and underground electrical. Medium voltage cable diagnostics condition based maintenance on power cables nico van schaik, e.
Ieee guide for the design and installation of cable. Underground cables are, of course, meant to be installed or laid under the ground. Peters hamburgische electricitatswerke ag, uberseering 12, 22297 hamburg, germany abstract. The route should be inspected for signs of soil subsidence and erosion. Manhole inspections are similar to other cable systems in that they verify structure condition and, most importantly, inspect the cable system. Limiting effects may also be important for subtransmission. Cema bulk belt systems and emerging technologies committee keith e.
There are many ways to engineer, build, and operate a satisfactory underground power system. Parts that have scheduled maintenance at fixed intervals, usually due to wearout or a fixed shelf life, are sometimes known as timechange. This is the final report for the power systems engineering research center pserc research project titled a novel approach for prioritizing maintenance of underground cables. Engineering and installations should jointly presurvey the job site and cable route to ensure all problem areas are uncovered before pulling. This process will determine the asset health, and act only when maintenance is actually necessary. Easement and vegetation management are addressed within the scope of the land asset methodology framework. Cables reducing failure rates and better management of. Condition based maintenance cbm is an part of asset management in a liberalised market place for electric energy. Line outage durations as extended repair time is required in underground system, services to. Crosslinked polyethylene xlpe and highpressure fluidfilled hpff systems. Although a distribution system with underground cables is less maintenance intensive than one with overhead lines, it is necessary to have clear procedures for preventive, corrective and condition based maintenance in order to ensure a long trouble free operational life for the cables.
Standard for an electrical preventive maintenance epm. On condition maintenance predictive maintenance cable testing. Power distribution system relies heavily on a vast network of medium voltage mv underground cables for power delivery. To fully utilize these investments, network owners will have to adjust their reliability engineering methods to suit the new cable networks. The type of maintenance to be considered here is the condition based maintenance. This relatively new approach to maintenance uses data drawn during operations andor maintenance intervals to forecast the need for additional or future maintenance. Offline since the early 1990s, major interest in socalled online monitoring has started to appear in the industry. Testing methods forpower cable insulation depend basically on type and material.
Repair cable failures are less common than for overhead lines but they do occur. Remove any corrosion on battery terminals with bicarbonate of soda. Figure 3 maintenance overview chart according to en 306 2001. A transmission cable may require 23 weeks sometimes longer to repair once the failure has. This paper provides an introduction to the cable system types and presents an overview into considerations for using underground cable systems. Structure of an underground cable system planning and projects construction and recultivation in operation man and the environment exhibition structure of an underground cable system. Because cbm is based on the equipment oriented concepts of pdm, it can be applied gradually one system at a time. We propose a new cbm policy for multicomponent systems with continuous stochastic deteriorations. Tpm framework for underground mobile mining equipment. Planned maintenance is preplanned, and can be date based, based on equipment running hours, or on distance travelled. Introduction since the loads having the trends towards growing density.
On stranded cable, if ends are corroded, cut off ends or separate strands and clean internally. Results of the condition assessment are input for the economical and technical assessment. Such systems bridge the time between power cuts and the startup of emergency power generation. This monitoring system does not require a power supply at the site of the cable joints and hence may find wide application for. It is a demanding approach because of the need for frequent inspection and monitoring of an object, part of the system or entire maintained system, but it offers an optimal.
Jun 14, 2015 condition based maintenance cbm is becoming increasingly important due to the development of advanced sensor and information technology, which facilitates the remote collection of condition data. Conditionbased maintenance of electrical power installations. Anyone associated with power cable operation, maintenance, location and fault detection techniques. High voltage underground cables i cable cable components 6 conductor 78 inner semiconductor shield 9 xlpe insulation 9 outer semiconductor shield 9 metallic screen 910 outer protective jacket 11 table of cable components 12 metallic screens earthing shortcircuit operating conditions 14 grounding methods 14 earth cable protection 15. These limits are relatively unimportant on overhead lines but will severely limit high voltage underground cable systems the higher the voltage the shorter the line length must be. This will give a maintenance concept for cable circuits as part of the total maintenance policy for the network.
Electronically reprinted from april 2017 facilitating. Two technically viable underground cable systems were considered for this 345 kv underground application. Apr 24, 2018 it is less liable to damage during storm or bad whether condition. There are three main methods of laying underground cables, which are i direct laying, ii drawin system and iii. Summary condition based maintenance cbm on power cable circuits is an important part of. How and why is this ability to detect and visualize an objects temperature proile important in maintaining systems or components. Partial discharge pd monitoring is one of the successful diagnostic tools for accessing the insulation condition of mv cables.
Plan and design underground distribution systems and discuss the pros and cons of the various design options, including the factors affecting underground distribution systems, such as reliability, economics, and environmental aspects, into their planning and design work. This kind of maintenance is based on the state of an object or system to be maintained. Condition based maintenance has been defined as maintenance actions based on actual condition objective evidence of need obtained from insitu, noninvasive tests, operating and condition measurement. Maintenance of electrical assets with pervasive sensing strategies continuous condition based monitoring of electrical conductors and insulation is an effective way to reduce required plant maintenance activities, cut operating costs, and prevent unplanned shutdowns. Condition based maintenance electrical power system. The consequences of ineffective equipment maintenance can be huge in terms of system. Pdf condition based maintenance on mv cable circuits as. Overhead lines can frequently been seen traversing the landscape from a long way away. Predictive maintenance of railway subsystems using an.
1528 1134 943 708 1087 313 661 840 1577 1083 351 233 404 207 287 1131 1105 237 1346 396 1500 1276 179 103 862 750 458 1518 1312 1405 493 1323 705 30 656 1266 400 1043 1400 1278 667 841 982 825 11 1476 820 954