Transport, Erection, commissioning and testing at site
After sales services
A team for each mission
In Electroputere, each member of the transformer SERVICE team is an expert in his field. We have the know-how and experience to be able to meet or exceed your expectations.
Our motto is: receptivity.
Technical solutions and consultancy
"Optimum designing, analysis, technical expertise, proposals of innovative technical solutions, together with the implementation of joint action plans and training sessions in Electroputere are the basis of a successful future. Our specialists' know-how and experience with transformers is put at your disposal in order to find solutions to complex problems.
Preventive maintenance works
Our SERVICE includes works for improving the condition of the transformer, on-site rehabilitation, supply of original spare parts, repairs of tap-changers, logistics, etc., which guarantees a maximum availability of your transformer. We will be your partners starting from the planning stage and up to the final commissioning stage. Our aim is to achieve the lowest possible life cycle costs (LCC) for our customers.
Modernization and rehabilitation works
"We can improve performance, increase value and extend the life-cycle of the existing transformer by a complete technical rehabilitation. Our mission extends beyond repairs. We upgrade the transformer with the help of the latest technologies and existing know-how, the result being reflected in the rehabilitated products we deliver. We can perform the works both in our workshop, located in Craiova, Romania or at site, using the repairing solutions available for the specific demand.
The objective of our work: to extend the life-cycle of the product.
The service contract
"SERVICE includes identification and traceability of the equipment, periodical evaluation of its status, maintenance works depending on the existing condition, repairs and improvement of performance, optimization works, transportation, assembly and commissioning of the new transformer, recycling of obsolete materials and instruction of the operator. You can rest assured that Electroputere offers: maximum availability at the minimum prices..
Evaluation of transformer status
"Solid knowledge regarding the transformer status, based on its history, the revision of the design and an advanced diagnostics, as well as the timely detection of defects and a plan of corrective actions allow us to have better reliability and optimizations of our network transformers.
Focus on getting maintenance in accordance with the condition of the equipment!
Always a step ahead
Due to the evaluation of the condition of the transformer, you will be able to:
- find out about the status of your equipment;
- ensure an optimal use of the equipment;
- avoid any unexpected events;
- anticipate or add quality to the services in a short period of time.
Online monitoring system
Due to the continuous measuring, monitoring and tracking system of the main operational data, the analysis, interpretation and evaluation of accidental failures or ageing factors, our system optimizes performance and guarantees the availability of the product. Being one step ahead means making the right decisions at the right time, based on accurate information. Electroputere's Transformer Service Department is an active partner of your business. Ensure a high availability of your product!
"Our technical solutions offer a new level of intelligent service by improving performance, availability, efficiency and testing, on-line monitoring, evaluation of the condition of the equipment, innovative solutions, training courses, technical services and consultancy, all of these from an integrating perspective of our portfolio, in accordance with the needs of our various customers. Being up to date with the condition of a group of transformers or a product represents the key to success in terms of you benefitting from an optimum maintenance program.
Improving performance and increasing the value of existing equipment depends on the complete technical rehabilitation, modernization and exhaustive check of the components. In some cases, the choice of whether to repair or not a transformer instead of replacing it can significantly decrease maintenance costs and ensure a faster installation than if buying a new one. Together with our customers, we try to conceive a repair plan that goes beyond replacing used parts. The final result will be a remanufacturing process through which Electroputere can offer its customers a new product, similar to the original.
On site technical assistance
We offer works for on-site improvement and modernization of the condition of the transformer, supply of original spare parts, reconditioning of tap-changers, logistics, transportation and 24/7 assistance in order to guarantee the equipment a maximum of availability. We will be your partners starting with the design phase. The professionalism of our process management and our on-site interventions will support you in developing optimum solutions. Our range of services includes: identification and traceability of the equipment, periodical evaluation of its status, maintenance works differentiated based on the condition in which the transformer is, repairs, improvement of performance, optimization works, recycling of damaged materials and training of the user. We believe in a pro-active, preventive and predictive maintenance. Our on-site technical assistance team is trained and qualified to help you avoid idle time and have your transformer back to operating mode as soon as possible.
State of the art on-site technical assistance
The on-line method used by Electroputere to regenerate the solid insulation of the power transformer implies using natural or synthetic absorbing materials in order to eliminate water and ageing products derived from oil and paper that could not be eliminated through other methods of treatment. The on-line regeneration technology does not require for the transformer to be taken out of operation, reduces operational costs and cancels transportation and reassembly costs. Regeneration costs are usually lower than those of replacing oil. The savings are significant (several times more) when on-line regeneration limits the losses caused by the interruption, generation and transportation of power. Water, acids and mud are the oxidation items that cause the biggest problems in terms of ageing of the oil. Transformer oil regeneration is a method through which the oil is given back properties very similar to those it initially had. The advanced diagnosis process, careful observation of the gases dissolved in oil and of other properties of the oil offers valuable information with regards to the state of the transformer. The advanced diagnosis analysis used by Electroputere usually reveals the seriousness of the problem, helps localize the problem and offers an advice from specialists, in order for you to find out what actions are imposed.
The period of time for which the transformer is out of operation, associated with the maintenance or damage repair works can be reduced significantly when important spare parts are available. Some of these spare parts can be easily bought from the manufacturer. We have a very good relationship with the suppliers of accessories, which makes it possible for us to monitor the code on each item and obtain original spare parts for a quick replacement. Moreover, we can offer technical advice for finding the equivalent spare part or for redesigning those that are obsolete.
On-site testing of the transformer
TRANSFORMER TEST SUMMARY CHART
PART TO BE TESTED TEST TO BE PERFORMED 1 Windings DC Resistance
Turns ratio/phase displacement
Excitation current at all tap positions
Short circuit impedance
Insulation resistance to ground (megohmmeter)
Dielectric Dissipation factor
2 Bushings Capacitance
Dielectric Dissipation factor
Oil level (sight glass)
Visual inspection (cracks and cleanliness)
3 Insulating oil Dissolved gass analysis (DGA)
Dielectric Dissipation factor
Number of particles
4 Tap changer – load Turns ratio at all positions
Timing and switching dynamic
Motor load current
Limit switch operation and continuity
5 Tap changer – no load Centering
Turns ratio at all positions
6 Core Insulation Resistance to tank
Ground test (megohmmeter)
7 Tanks and associated devices Pressure/vacuum/temperature gauges-calibration
Visual inspection (leaks and corrosion)
8 Conservator Visual inspection (leaks and corrosion) 9 Air drier desiccant Proper color
Valves in proper position
10 Sudden pressure relay Calibration and continuity 11 Bucholtz relay Proper operation and continuity 12 Cooling system Temperature 13 Heat exchanger radiators Clear air flow
Visual inspection (leaks, cleaning and corrosion)
14 Fans Controls
Visual inspection and unusual noise
15 Pumps Rotation and flow indicator
Motor load current
TRANSFORMER CONDITION ASSESSMENT SUMMARY
TEST DEFECTS TOOL ONLINE TEST 1 Dissolved gas analysis Internal arcing, bad electrical contacts, hot spot, partial discharge
Overheating of: oil, tank and cellulose insulation.
Requires laboratory analysis
2 Oil physical and chemical tests Moisture, degraded IFT, acidity, furans, dielectric strength and power factor. Requires laboratory analysis 3 External physical inspection Oil leaks, broken parts, warm paint, defective support structure, stuck indicators, noisy operation, loose connections, cooling problems with fans, pumps, etc. Experienced staff and binoculars 4 External temperature (main tank and load tap changer) Temperature monitoring with changes in load and ambient temperature. Portable temperature data recorder and software. 5 Ultrasonic (acustic) contact fault detection Internal partial discharge, arcing, sparking, loose shilds, poor bushing connections, bad tap changer contacts, core ground problems and weak insulation that is causing corona. Ultrasonic detectors and software analysis. 6 Vibration analysis Internal core, coil and shield problems. Loose parts and bad bearings. Vibration data logger. OFFLINE TEST 1 Bushings capacitance, insulation power factor, tip up, excitation current) Loss of winding insulation integrity, loss of bushing insulation integrity, winding moisture. Specific test equipment.
Dielectric response analysis
2 Turns ratio Shorted windings. Turns ratio tester. 3 Short circuit impedance Deformation of the core or winding. FRA ( frequency response analysis) analysis 4 Core to ground resistance(external test may be possible depending on the transformer condition) Bad connection on intentional core core ground and existence of unintentional grounds. Megger 5 Winding direct current (DC) resistance measurements Broken strands, loose connections, bad tap changer contacts. Wheatstone bridge (1 ohm and higher). Kevin bridge micro-ohmmeter (less than 1 ohm). 6 Frequency response analysis Shifted windings FRA analysis 7 Internal inspection Oil sludging, displaced winding or wedging, loose windings, bad connections, localized heatig, debris and foreign objects. Experienced staff, micro-ohmmeter. 8 Degree of polymerization Insulation condition (life expectancy). Laboratory analysis of paper sample.