Abb library is a web tool for searching for documents related to abb products and services. Uncompromising quality and maximum reliability is guaranteed. Dielectric frequency response high low high high low low 0,001 0,01 1 100 0,001 0,01 0,1 1 frequency hz tor 0,1 10 ture and e on y oil conductivity. Camtech has prepared this handbook to cover all essential aspects of maintenance of tap changer. Singlephase transformer with ltc in one package consider the common situation where equipment maintenance or failure requires taking the product offline, i. Along with dielectric and electric states, a defective tab changer can damage. Detecting faults in oltcs is one of the key challenges facing the power equipment predictive maintenance community. Hence, it demands special consideration during routine maintenance. Refurbishment includes a complete overhaul of the regulating transformer plus other improvements regarding loading capability, an increase in insulation levels, a decrease in noise levels, and the possible replacement of the bushings and of the ltc or a complete overhaul of the ltc. When additional information is desired to satisfy a problem not covered sufficiently for the users purpose, please contact your cooper power systems representative. Do not subject tap changer to temperatures above 150f 66c. For ltcs where oil is used for arcquenching, the arcing at the arcing switch or arcing tap switch contacts causes contact erosion and.
Maintenance and repair of onload tapchangers reinhausen. Multiple recharging without detailed investigation may leads to failure of transformer windings. Some modes of failure can occur regardless of construction type. To do so may cause damage to the contact panels, resulting in misalignment of the contacts. These operational and electrical checks performed during a ttr help determine the condition of the load tap changer. Maintenance of on load tapchanger shall be performed according to the instructions given by the supplier of the tapchanger. The pes and ias chapters will sponsor a technical seminar on the topic of reinhausen rmvii on load tap changer maintenance and application. Cm oltc is to be mounted to the transformer tank cover by its tap changer head which serves also for.
Maintenance of on load tap changer shall be performed according to the instructions given by the supplier of the tap changer. The components group offers load tap changer failure analysis, reverse engineering and a variety of manufacturers ltc replacement parts, transformer health products and comprehensive ltc maintenance courses for all skill levels. Transformer components deenergized tap changer, type dtw. Warranty voids if transformer fails due to poor maintenance of oltc. The constant switching capacity over the entire lifespan of the vacuum interrupters. The oil in the load tap changer is drained and changed. This paper explains the technological developments of resistor type oltcs as well as of reactor type oltcs. Reinhausen rmvii on load tap changer maintenance and. Frequently change in load changes the voltage of the system. Maintenance handbook on tap changer of ac electric. Load tap changers, types uze and uzf with motordrive mechanism, type buf3. Load tap changer maintenance ground support electric. Onload tapchangers oltcs are indispensable in regulating power transformers used in electrical energy networks and industrial applications 2. Waukesha uzd technical manual spx transformer solutions.
These might include tap changer failures, bushing failures, tank failures, moisture ingress, and other forms of dielectric fluid contamination. What is a transformer tap changer engineering tutorial. Training course oltc maintenance for utilities industry at. Shzv onload tap changer maintenance should be carried out by trained professional engineers. Transformer components deenergized tap changer, type. With more than 6,000 tap changer maintenance deployments every year, our specially trained and tested service technicians have unrivaled field experience. Power transformer tap changers design, maintenance and. Extent of tap changer maintenance for oil and vacuum type tap changers.
These cam switches are geared directly to the tap changer motor and are contained in an air compartment within the tap changer housing. On load tap changer in service maintenance aspects. Filling the oil compartment of the onload tapchanger with oil. The main component is the selectorswitch combined tap selector and diverter switch. Onload tap changer reliability and maintenance strategy. May 25, 2011 oltc maintenance under extrem time pressure.
Qd5 quikdrive voltage regulator tapchanger instructions. Onload tap changer fault diagnosis and maintenance of 100 mva. University of queensland st lucia campus, brisbane day 1 14218 8. Ghanim putrus, edward bentley, in electric renewable energy systems, 2016. September 1991 supersedes 990 1991 cooper power systems, inc. Onload tapchangers for power transformers a technical digest. Tap changer is one of the main components of transformer which is highly beneficial to stabilize output voltage 3,4. The contacts are then immediately visible and can be inspected for wear.
Chapter 8 load tap changer fault diagnosis onload tap changers oltcs are one of the most problematic components of power transformers. Huaming reserved rights for technical data and operation. Do not install, operate or perform maintenance work on the product in ar eas where a risk of explosion is present. The type dtw tap changer is a modular, bridgingtype zigzag tap changer with an external operating mechanism. For ltcs where oil is used for arcquenching, the arcing at the arcing switch or arcing tap switch contacts causes contact erosion and carbonization of the arcing switch oil. The onload tapchanger for maximum switching frequency. This is normally achieved by changing the ratios of the transformers on the system by altering the number of turns in one winding of the appropriate transformers. Reception, installation, operation and maintenance manual for three phase padmounted transformers. Onload tap changer reliability and maintenance strategy request. Tap changer overhaul preventive maintenance maintenance. Maintenance of olts manufacturers recommendations diverters. To prevent contamination of the tank oil and facilitate maintenance operations, the diverter switch usually operates. The most frequent attention given to power transformers is visual inspection, which involves mainly checking the transformers general exterior condition and cooling system.
Function in general, the control system of a load tap changer to be must per form five distinct functions. Industrial transformers spx transformer solutions, inc. Maintenance of transformer power transformers maintenance. Moving and stationary contacts are inspected and checked. Maintenance handbook on tap changer of ac electric locomotive. A tap changer is a device fitted to power transformers for regulation of the output voltage to required levels.
Power transformers must be inspected regularly so that problems can be detected early and corrected before major repairs are needed. Mcgrawedison vr32 regulator and cl5 series s2251010. Proper load andor onload tap changer ltc oltc maintenance has become. As such it is desirable to perform various preventative maintenance activities to ensure the transformer maintains a high level of performance and a long functional life. Tapchangers and switches transformer insulation and. Request pdf onload tap changer reliability and maintenance strategy hydroquebec canada summary hydroquebec operates. Onload tap changer type v 350500 and type h 400 additional securing of the tensioning bolt at the movable main contact onload tap changer type v 200350500700 changing of energy accumulator springs onload tap changer type v 200350 with an additional end position limit reworking. Maintenance and repair of onload tap changers put your trust in the expertise of the market leader. The art of transformer maintenance, inspection and repair. A comprehensive, unmatched network of 21 service locations worldwide also guarantees.
One is done on a regular basis and the other is done at the time of urgency. The deenergized tap changer is usually installed into the high voltage circuit of the transformer and, most of the time, it is used to adjust the primary voltage of the transformer within a 5 percent range in four steps. Bue spare parts list, motordrive mechanism english pdf service. The ltc is a very complex and intricate mechanical device that requires truly experienced technicians to perform maintenance and repairs. Maintenance of load tap changers ltcs photo credit. Maintenance and inspection of the tap changer are simplified since access to the active part of the tap changer is made easy with a large, hinged door panel on the front of the compartment. Onload tapchanger type cm operating instructions huaming. Noload tap changer nltc, also known as offcircuit tap changer octc or deenergized tap changer detc, is a tap changer utilized in situations in which a transformers turn ratio does not require frequent changing and it is permissible to deenergize the transformer system. Control of transformers tap changer is the most popular form of voltage control at all voltage levels in a power system. This is the only book published to address the concerns of transformer owners who want to realize the maximum return of their investments.
With a transformer with ltc, whenever one phase of the tap changer fails or requires maintenance, the entire package. A power transformer requires various routine maintenance. The maintenance of your load tap changer ltc is one of the most critical maintenance requirements your transformer will ever require. Put your trust in the expertise of the market leader. We are having a highly expertized team for repair and maintenance of on load tap changers of any make. Tic 2 day cpd advanced course program 1415th feb, 2018 power transformer tap changers design, maintenance and retrofit venue.
For maintenance the oil is drained and the front cover is opened. The tap changer is usually placed on the high voltage winding as the current is lower and this minimizes the current handling requirements and stress during operation of the tap changer. Maintenance of transformer load tap changers ltc eep. The actual condition of the tap changer, as determined from the results of maintenance inspections, are then compared with the assessments based on results.
The art of transformer maintenance, inspection and repair eep. New solidstate circuit protection devices are also emerging to enhance fault tolerance and fault isolation capabilities for gridscale. Reference should be made to iec 60214 tap changers and iec 602142 application guide for onload tap changers and especially to the tap changer manufacturers operation and maintenance instructions. Reference should be made to iec 60214 tapchangers and iec 602142 application guide for onload tapchangers and especially to the tapchanger manufacturers operation and maintenance instructions. Onload tap changers oltcs are indispensable in regulating power transformers used in electrical energy networks and industrial applications 2. Contact adjustments or replacements are made as necessary. A power transformer is the most costly and essential equipment piece of equipment within an electrical substation. The handle is operated for manual operation in case of an emergency. Before closing the bypass switch, the regulator must be on neutral and the. We wrote the book 1981 first edition, 2001 second edition on transformer maintenance. Maintenance handbook on tap changer of ac electric locomotives march,2002 2 foreword the proper maintenance of tap changer is necessary for trouble free operation of electric locomotive and to avoid failure enroute. The tap changer is operated by a motor operated driving mechanism of local or remote control. Example of maintenance strategy and operating costs example. To avoid damaging the unit, never exceed the operating limits stated in delivery documents and on rating plates.
This adjustment may be made by an onload tapchanger, or by a deenergized tapchanger, or by the selection of bolted link positions. Power transformer tap changers design, maintenance and retrofit. On load tap changer in service maintenance aspects by jurgen thomas schwarz, reinhausen south africa abstract whenever you have to make a decision on buying a new asset for the substation, you choose a technically mature and sophisticated technology off the market. Lifting eye connection to oil conservator load tap.
Nov 17, 2019 a power transformer is the most costly and essential equipment piece of equipment within an electrical substation. Ltc maintenance is the basis for the regulating transformers high level of reliability. Electrical transformers are an expensive and important part of any machinery. A comprehensive, unmatched network of 21 service locations worldwide also guarantees fast delivery of spare parts as well as 247 availability.
Onload tap changers type uzf conventional onload tap. Before you start any work, make sure that the personnel doing the job have read and fully understood the maintenance documents provided with the unit. This is a safe method and it is recommended for transformers and conventional on load tapchangers. Request pdf onload tap changer reliability and maintenance strategy hydroquebec canada summary hydroquebec operates over 1,200 transformer units with onload tap changers oltc, covering. So for getting optimal performance and increased product life, it is best to conduct regular maintenance checkups on your machinery. Aug 10, 2016 maintenance engineering maintenance of onload tap changer, maintenance engineering maintenance of onload tap changer, maintenance engineering maintenance of. The on load tap changer, the only part in movement and succumbed to the mechanical wear, is generally considered as a weak link of the transformer. Supply authorities are under obligation to their customers to maintain the supply voltage between certain limits.
Equipment age, extreme usage, lack of replacement parts, and declining availability of technical experts all add to the growing risk of failure of transformer ltcs. It is one of few non static devices in the transformer and is required to transfer load current several thousand times a year. Factors resulting from interconnections and power networks to aging equipment and the declining pool of technical experts add to the challenge. The uzf model also features an angled active part with an access panel on top of the compartment. As with all ge voltage regulators, there is no required maintenance plan for the vrfc regulator, resulting in one of the lowest total costs of ownership in the industry. Within 48 hours a team of mr service specialists managed a big maintenance job at turkish steelmill yolbulan. Onload tapchangers oltcs are one of the indispensable compo nents for the regulation of power transformers used in electrical energy networks and industrial application. Tap changer overhaul and upgrade proper load andor onload tap changer ltc oltc maintenance has become increasingly complex even for the best utility and industrial managers.
Maintenance engineering maintenance of onload tapchanger, maintenance engineering maintenance of onload tapchanger, maintenance engineering maintenance of. To increase contact life and reduce maintenance, the waukesha uzd load tap changer has separate arcing contacts and main currentcarrying contacts on. May 25, 2012 the pes and ias chapters will sponsor a technical seminar on the topic of reinhausen rmvii on load tap changer maintenance and application. Voltage regulators cooper power systems vr32 regulator and cl4c control. Maintenance of transformers a detailed checklist electrical4u. Online condition monitoring of tap changers cired international. Mcgrawedison vr32 regulator and cl5 series control caution.
Basics, maintenance, and diagnostics xi contents continued page 9. Reception, installation, operation and maintenance manual. Factors resulting from interconnections and power networks to aging equipment and the. The tap changing in the power transformer is mainly done for keeping the output voltage within the. Abb offers a comprehensive portfolio of onload tapchangers both the conventional and vacuum type, for high voltage and low voltage. The background for maintenance recommendations is as follows. Mar 07, 2016 a tap changer is a device fitted to power transformers for regulation of the output voltage to required levels. With more than 6,000 tapchanger maintenance deployments every year, our specially trained and tested service technicians have unrivaled field experience. No cutoff arcing in the onload tapchanger oil no oil filter system needed clean oil simplifies and speeds up maintenance work much lower maintenance frequency in comparison to conventional oil switching technology extra. This type of transformer is frequently employed in low power, low voltage. A tap changer is a mechanism in transformers which allows for variable turn ratios to be. There are basically two types of transformer maintenance.
889 580 1009 1132 889 170 1094 519 1526 1398 397 1306 1316 822 702 250 324 822 1381 1248 1336 89 413 1497 166 567 362 495 907 1071 1311 382 1300 296 174 283 291 1347 516 874 1393 1032 1007