There is no such thing as monitoring something based on condition. Peters hamburgische electricitatswerke ag, uberseering 12, 22297 hamburg, germany abstract. Currently, there are three maintenance methods employed by utilities. Condition based maintenance 1996 page 3 of 11 online vs. Results of the condition assessment are input for the economical and technical assessment. Condition based maintenance of mv power cable systems on the basis of advanced pd diagnostics. Work on underground cable systems use and upkeep of safety appliances in substations and other electrical premises. Underground, oil filled, pipe type cable systems were designed for an expected life of 30 40 years, primarily driven by the life span of the oil circulating and pumping equipment. We propose a new cbm policy for multicomponent systems with continuous stochastic deteriorations.
It is our opinion that if changes are not made along the lines we suggest, ipl can expect to. Condition based maintenance cbm program for medium voltage underground cables after early application of very low frequency vlf. Parts that have scheduled maintenance at fixed intervals, usually due to wearout or a fixed shelf life, are sometimes known as timechange. One of the predominant causes of cable failure is partial discharge pd and collection of pd data can help fill this information gap. Ieee guide for the design and installation of cable systems. These types of transmission line systems were replaced due to auxiliary equipment problems and replacement material. It enables maintenance to plan repair and replacement of cables to be carried out timely. Implementation of conditionbased maintenance for medium.
Planned maintenance is preplanned, and can be date based, based on equipment running hours, or on distance travelled. Corrective maintenance dominates in todays power industry. Condition based maintenance gap analysis reliabilityweb. Condition based maintenance on mv cable circuits as part. Condition based maintenance these check underground power transmission cables and aboveground grid fixtures like joints and terminations that have already experienced partial damage. Condition based maintenance cbm is an part of asset management in a liberalised market place for electric energy. Being able to predict the incipient problems, condition based. Underground cable testing and life expectancy diagnostics. 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. Overhead lines can frequently been seen traversing the landscape from a long way away. Condition based maintenance of asset health lends itself to large.
May 22, 2015 crosslinked polyethylene xlpe cable, illustrated in figure 6 below, cable is being used for 230 kv underground transmission line systems. The frequency of the condition based maintenance is fixed based on the type of equipment and its previous history. Condition based maintenance of mv power cable systems on. Figure 3 maintenance overview chart according to en 306 2001. The strategy of moving towards maintaining and replacing assets only when strictly necessary condition based maintenance can help considerably in meeting these needs. Today, improvements in technology are making it easier to gather, store and analyze data for cbm. Pm can be further subdivided into condition based maintenance and predetermined maintenance which implies that pm can be time based or condition based. Offline since the early 1990s, major interest in socalled online monitoring has started to appear in the industry. Condition based maintenance, which is predictive in nature, is part of condition based monitoring. Figure 7 is a photo of a typical cable pulling arrangement. Results of the condition assessment are input for the economical.
The transmission lines would be very expensive, so high voltages are used thousands of volts to transmit from the generating plants, with relatively thin wires. The event of november 19, 2011 adds new emphasis and urgency to these issues. Tpm framework for underground mobile mining equipment. This paper discusses the approach, experiences and way forward in developing and. Identifying and isolating these issues creates opportunities for optimizing replacement part inventories, scheduling downtimes for planned maintenance, and making runtime process adjustments that can extend the useful life of the. Condition based maintenance cbm is an important part of asset management in a liberalised market place for electric energy. Pdf condition based maintenance cbm is an part of asset management in a liberalised market place for electric energy. The interpretation of data coming from condition monitoring systems, the reli. Test or measurements are carried to determine the condition of the equipment. This paper deals with the condition based maintenance of singleunit systems which are subject to the competing and dependent failures due deterioration and traumatic shock events. Mamishev, member, ieee abstract maintenance of distributed infrastructures requires periodic measurement of many physical variables at numerous locations.
Download as docx, pdf, txt or read online from scribd. Introducing current industrial practice and challenges. Appreciate the role of regular inspection and condition based maintenance in ensuring safe operation gain an insight into the organisational aspects of safety. By contrast, conditionbased maintenance is not directly based on equipment age. To ensure only a good condition of ug cable in tnb system. The condition indicator captures some feature of the signal that changes in a reliable way as system performance degrades. Clearly, the consequences of cable asset failure could lead to a serious disruption of network operation which, in turn, reinforces the importance of condition assessment. Cable types, failures, root causes and phases in cable lifecycle.
We express our appreciation for the support provided by psercs industrial members and by the national science foundation under grant nsf. Diagnostic tests used on new and on service aged cable systems. Though the term is used in industry, it is used incorrectly. However, two significant challenges still greatly affect the diagnostics result. Medium voltage cable diagnostics condition based maintenance on power cables nico van schaik, e. Condition based maintenance cbm program for medium voltage underground cables after early application of very low frequency vlf technologies proven to cause sideeffects on the insulation integrity of inservice cables. The checklists are in pdf format and can be completed electronically or printed and used as hard copy. Pdf condition based maintenance cbm is an part of asset management in a. Intelligent destroyer initiative mset background original mset 1998 is mature and in use for prognostics in many safetycritical and businesscritical industries. The aging of power cables begins long before the cable actually fails. These limits should not be used for cables subjected to pulling tensions during installation. Autonomous robotic monitoring of underground cable systems. By y wang, ea technology group reducing failure in underground cables launched in 20, the cable data collector is a test instrument which measures partial discharge activity in live distribution voltage cables, without the need to deenergise them. Assessing the condition and remaining life of underground electrical cables first edition december 2016 published by energy institute, london the energy institute is a professional membership body incorporated by royal charter 2003.
Predictive maintenance and conditionbased monitoring. An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. Condition based maintenance allows preventive and corrective actions to be scheduled at the optimal time, thus reducing the total cost of ownership. The interference from external disturbances like storms, lightening, ice, trees etc. The diagnostic capabilities of predictive maintenance technologies have increased in recent years with advances made in sensor technologies. Pdf electrical equipment condition based maintenance strategy. Conditionbased maintenance cbm is a maintenance strategy that collects and assesses realtime information, and recommends maintenance decisions based on the current condition of the system. Condition based maintenance of mv power cable systems on the. Condition monitoring gives the information needed for safe and reliable operation, replacement strategy and hence increases the system reliability. Conditionbased 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 monitoring software fiix. The discussion is focused on transmission cables but also has relevance for distribution cable applications. For service aged medium voltage cable circuits it is realised by means of cable diagnostics as part of the condition assessment of the underground cable network. Conditionbased maintenance cbm approach today, more and more power utilities are switching to moneysaving and effective condition based maintenance programs for scheduling of machine maintenance and testing.
This paper provides an introduction to the cable system types and presents an overview into considerations for using underground cable systems. A condition based maintenance policy for multicomponent systems with a high maintenance setup cost citation for published version apa. It helps to predict when and what kind of repairs might be needed in the future, or if faulty sections need immediate replacement. At present, numerous high voltage xlpe cable systems with nominal voltages up to 500 kv and. Preventive maintenance this aims to thwart possible faults that arise from outright negligence of the power distribution infrastructure. 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. Overhead or underground a comparison legislative services. Demands for reliable power causes a growing tendency to apply different strategies in the form of condition based maintenance. Malaysian cable manufacture havestop their production of pilc cable and difficult for tnb to have spare part for repair in the future. Pdm uses cbm systems to detect fault sources well in advance of failure, making maintenance a proactive process. Standard pembinaan sistem kabel bawah tanah pembahagian, jun 2014. Condition based maintenance optimization for wind power.
Table of cable components 12 metallic screens earthing shortcircuit operating conditions 14 grounding methods 14 earth cable protection 15 earthing diagrams 1617 laying methods 1819 cable reels 20 permissible bending radius 20 pulling tensions 20 fastening systems 21 cable system tests 21. From the point of view of a power utility, insight in the condition of their medium voltage power cable network becomes more and more important to guarantee a reliable and secure power supply. Data acquired by online pd measurements can help in identifying the upcoming faults in such cable networks and possibly forecast the remaining life of the insulation. I manage multiple dc plants with well over a thousand amps worth of juice. The number of extrahighvoltage alternatingcurrent ac underground cable systems installed in colombia has grown rapidly.
Although, the armoring and outer sheath takes care of the physical safety of cable, adequate care has to be taken by cable manufactures during manufacturing of the cable. Facilities instructions, standards, and techniques volume. The cable generally comprises of the conductor, insulation material, bedding, beading armoring, and outer sheath etc. Building condition based maintenance cbm logic for. It is general experience of practically all the utilities that most of the equipment dont show any abnormality during scheduled maintenance and there. Condition based maintenance optimization for wind power generation systems under continuous monitoring zhigang tiana, tongdan jinb, bairong wua, fangfang dinga aconcordia institute for information systems engineering, concordia university, 1515 stecatherine street, west ev7. This will give a maintenance concept for cable circuits as part of the total maintenance policy for the network. 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. Implementation strategies and tools for condition based. 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. Implementation of condition based maintenance for medium. Mobile monitoring of underground cable systems citeseerx. This process will determine the asset health, and act only when maintenance is actually necessary.
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. On condition maintenance is based on using realtime data to prioritise and optimise maintenance resources. 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. This is the motivation behind condition based maintenance.
Condition based maintenance cadick corporation revised, october, 1999 page 5 of 18 data point how used motor vibration vibration values are compared against manufacturer or industry supplied norms. 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. On condition based maintenance is they key to maintain the correct equipment at the right time. Condition based maintenance is based on assessing the condition of cables and equipment that have already suffered partial damage and thereby predicting the need and timeline for future maintenance or replacement. Condition based maintenance in manufacturing industries. Condition based maintenance electrical power system. Seminar high voltage electrical resistance and conductance. 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.
The development of high voltage xlpe cable systems goes back to the since then production and material technology have improved significantly, providing reliable and maintenancefree products to the utility industry. Condition based maintenance of underground cable condition based maintenance of underground cable systems. Butcher 2000, defines the maintenance technology as cbm is a set of maintenance actions based on realtime or near. Of all the major asset classes, underground cables often have the least available condition data but at the same time have a significant impact on network performance. A signal based condition indicator is a quantity derived from processing signal data. Deregulation of power market brings changes by creating an increase in competition among utilities. For serviceaged medium voltage power cable circuits, it is realised by means of cable diagnostics as part of the condition assessment of the underground cable network. To reduce the high setup cost of maintenance, a joint maintenance interval is introduced. In particular, cbm is highly effective where safety and reliability is the paramount concern such. This relatively new approach to maintenance uses data drawn during operations andor maintenance intervals to forecast the need for additional or future maintenance. Asset optimization and conditionbased maintenance cbm. Condition based maintenance on mv cable circuits as part of.
Overall condition assessment cable, termination, and joints indication of overall degree of water treeing in xlpe cable data obtained at lower voltages lower risk of failure on test over time, multiple tests can predict rate of aging test duration is relatively short for good cables works on epr and xlpe cable systems. Although much research has been devoted to maintenance planning based on realtime condition monitoring, most existing methods use only diagnostic information, consider planning of individual components, and focus on lastminute planning. This is one area in which underground cables can really score. Condition based maintenance gap analysis traditional reliability centered maintenance rcm has demonstrated the great cbm utility when applied airframe wide to a new system. Oracle mset2 inherits and improves the value proposition for realtime prognostics for iot optimal predictive maintenance of critical assets. Preventive maintenance pm, as scheduled maintenance tends to be called, doesnt prevent anything, navarro says. Assessing the condition and remaining life of underground. Underground power cable systems new york city no overhead since 1890s singapore 100% underground the netherlands distribution 100% belgium ban on oh lines since 1992 denmark replaced six 2 kv oh lines with two new 400 kv ug cables in 1997 and 1999 december 1999 storms in france caused many. Asset optimization and conditionbased maintenance cbm improving reliability and quality ann moore business development executive. Predictive maintenance pdm, also known as condition based maintenance cbm, is well known1 to reduce costs and improve machinery and plant reliability and availability by reducing the need for corrective or reactive maintenance and. Ieee guide for the design and installation of cable systems in substations. Cable earth shield coming out of the cable whether single core or three core must not be touching any earthed metal except at terminating point to substation earth. Underground high voltage cable repairs eleccomm underground electrical cables distribute electricity to homes, parking lot.
With that migration to xlpe is the best decision for reliability of electric supply. For several years, detection and localisation of partial discharges pd using ac voltages is internationally accepted as a symptomatic, reliable diagnostic method for determination of the quality of. Implemented correctly, this approach can deliver significant cost savings, whilst keeping reliability and quality at the required level for electrical assets. Next to that the methods for diagnosing xlpe cables, based on loss factor. Motors with vibration signatures which exceed these norms are scheduled for offline repair. Following are the guidelines when conducting online partial discharge testing of power cables. Partial discharge pd monitoring is one of the successful diagnostic tools for accessing the insulation condition of mv cables. There is less maintenance associated with underground xlpe cable systems.
Earth shield at cable termination should be insulated using shrink tubes in order to get access to individual cable. Pdf condition based maintenance on mv cable circuits as. A conditionbased maintenance policy for multicomponent. Cbm condition based maintenance cfr code of federal regulations cmms computerized maintenance management system co2 carbon dioxide dc direct current epss emergency power supply systems fist facilities instructions, standards, and techniques hecp hazardous energy control program hz hertz jha job hazard analysis mawp maximum allowable working.
Condition based maintenance and condition monitoring. Introduction increasingly, utilities, developers and power. Underground cable systems bing jiang, student member, ieee, alanson p. May 04, 2015 condition based maintenance cbm is a methodology that combines predictive and preventive maintenance with realtime monitoring. On condition maintenance predictive maintenance cable testing. Cema bulk belt systems and emerging technologies committee keith e. Results of the condition assessment are input for the economical and technical. Pdf condition based maintenance on mv cable circuits as part of.
The concept, quite correctly, is based on the belief that if equipment can be evaluated, and. Efforts to introduce a rational condition based maintenance programme started as early as almost two decades ago. How to maintain underground electrical cables sygnite. Condition based maintenance manual for underground cable, august 20. Underground cable maintenance procedures routine maintenance can help minimize the frequency of cable faults, and these procedures are classified as follows. Summary condition based maintenance cbm on power cable circuits is an important part of. Equipment such an oscillating wave testing system owts can be used to identify, evaluate and detect partial discharge conditions in cables, joints and terminations. Condition based maintenance of underground cable systems. General guidelines for online partial discharge testing of. In recent decades, research on cbm has been rapidly growing due to the rapid development of computerbased monitoring technologies. What are the maintenance procedures for underground.
Statistical distribution of cable failure causes, joint type and termination type failures. A condition based maintenance policy for multicomponent systems with a high maintenance setup cost. As it is normally used, pm minimizes downtime only. Ongoing analysis will take some time to tweak screens and. Underground cable distribution up to and including 33kv infrastructure technical standards page b05. Pdf online partial discharge assessment and monitoring. Cbm for service aged medium voltage cable circuits is realised by means of cable diagnostics as part of the condition assessment of the underground cable. Condition based monitoring enables early detection and diagnosis of machine and system abnormalities in real time. The data and information provided from the test results provided will assist with. Electrical inspection checklists this pdf contains 77 electrical inspection checklists taken from the 2014 electrical inspection manual with checklists.
Optimising a replacement strategy based on condition and strategicimportance. High voltage xlpe cable systems technical user guide. Timely conditionbased maintenance planning for multi. In designing algorithms for predictive maintenance, you use such a condition indicator to distinguish healthy from faulty machine operation. 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. Reducing failure in underground cables spoton models. University college of engineering rawatbhata road, kota in partial fulfillment of the requirement for the award of the degree of. Pdf condition based maintenance in manufacturing industries. Partial discharge pd based online monitoring has increasingly been adopted for condition based maintenance cbm of underground power cable utilities systems.
Equipment such an oscillating wave testing system owts can be used to identify, evaluate and detect partial discharge conditions in cables, joints and. Wet electronics new electronics materials that operate while wet. Pdf condition based maintenance of lv cable network of. Conditionbased maintenance of electrical power installations.
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