We provide answers to the management and maintenance of assets in order to increase safety, reduce failures and incidents and optimize environmental and maintenance costs.
The Electric and Electromechanical tests and trials area has 3 laboratories accredited by IPAC (Portuguese Institute for Accreditation):
• High-Voltage Laboratory (LAB-AT);
• Electrical Metrology Laboratory (LAB-ME);
• Energy Metering Laboratory (LAB-CE), that also has the recognition of IPQ as OVM - Metrological Verification Organism, for testing BT counters.
Performance analysis services of electrical systems:
• Tests, at power-frequency, of lightning impulse test and switching impulse test (dry and wet);
• Partial discharge measurement, environmental tests and ageing tests;
• Tests to characterize the state of equipments/electrical systems;
• Metering systems calibration in high voltage and high current;
• Calibration of test and metering equipments;
• Dielectric strength testing in power transformers and rotating electrical machines;
• Power quality monitoring;
• Measurement of electromagnetic fields and radioelectric disturbances (RIV);
• Registration and analysis of electrical transients;
• Measurement of ground resistance and scalar potentials, continuity verification and touch and step voltages determination;
• Maintenance engineering and fault diagnosis.
Electrical and electromechanical systems analysis services:
• Environmental tests;
• Electric ageing tests.
Energy Metering Trials
• Testing of electrical energy meters;
• Accuracy checking of electric meters static clocks;
• Metering audit of types 1, 2, 3 and 4;
• Maintenance of metering and telemetering systems.
EDP Labelec offers terrestrial and aerial thermography services, with a focus on power plants, substations, switching and transforming stations, electrical panels, MV, HV and EHV overhead power lines, thermal insulators and facilities.
Thermography allows the acquisition of instant images of the temperatures, detected by the infrared cameras (IR), at each moment.
EDP Labelec operators with adequate training and years of experience in thermography, thermographic observation and analysis of the state of operation of electrical and mechanical equipment, can obtain reliable results (measurement of severe temperatures) and interpretations of the operational state of inspected organs.
Inspections results are presented with thermograms, photographs and temperatures of selected points from organs with abnormalities; they also include extrapolations of measured values for other operating conditions (e.g., for other values of load) and recommendations for action, in light of the interpretation of results.
As a result of this activity and this experience is possible to reduce revenue losses that result from unexpected equipment service outages, verify initial running quality of equipment recently placed in service, plan more efficiently and economically maintenance activities and avoid serious accidents with persons and facilities, originated by faults.
The overhead power lines thermographic inspections at EDP Labelec began almost simultaneously with inspections of other electrical facilities, by land, with operations since 1980.
In 1994 was held the first experience of inspection by helicopter, which came to originate overhead power lines inspection routines, which have been growing in number and variety.
In 1996 was introduced an important improvement - inspection with a stabilized gimbal remotely controlled from inside the helicopter and with two cameras - video and IV.
In 2007 was incorporated, at the overhead power lines inspection activity, the determination of distances between conductors and obstacles, with a laser/LIDAR and a geo-referenced anomalies system and digital imaging.
This system, initially developed in EDP Labelec, has allowed the identification, over the years, of thousands of critical or serious distances, which are transmitted to the client with images of 'clouds of laser spots' and lists of points with anomalies.
This information allows the companies that own overhead power lines, from the HV to EHV, to reduce the lines outage and plan more effectively the maintenance actions. As the LiDAR system can be used simultaneously with visual inspection flight and thermographic inspection, there is a significant saving of inspections costs.
In 2013, it was acquired a second gimbal which includes two further sensors - a 'reflex' photography camera, to record quality photos of visual anomalies and an ultraviolet camera (UV), which allows to view the corona effect in daylight.
The use of two systems and two helicopters has afforded the inspection of more than 20000 km of lines per year.
The aerial thermographic inspections have also allowed thermal mapping inspections and evaluation of the thermal impact of thermal power stations rejected water.
Thermographic inspections are accredited by IPAC (Certified L0220).
Determination of the lifetime expectancy of insulating paper, which allows our customers a more efficient decision about the investment to be made.
Regeneration of insulating oils increasing the life cycle of oil and equipment. This is a solution where the cost / benefit ratio is more attractive and with practically nonexistent environmental impacts.
Consulting within the online monitoring area, supporting the most suitable monitor selection to each case and performing the validation of the measurements made by the device
Post-mortem analysis of transformers to obtain additional information for diagnosing the fault causes, which impact the operation of transformers in service and eventually the design of new transformers.
Evaluation of the transformers’ health index, enabling the ranking of equipments in terms of their condition, for a better management of assets, allowing the prioritization of interventions to be made in the costumer's transformers.
The main activities of the department are as follows:
• Preventive monitoring of oil insulated electric equipment, namely: power transformers, current transformers, voltage transformers, combined transformers, crossings, ruptures, among others;
• Transformers faults diagnosis;
• Evaluation of the transformers’ health index;
• Characterization of insulating oils corrosive effects;
• Chlorine detection test of PCB's, PCT’s and PCBT's in insulating oils;
• Determination of life expectancy of insulating paper;
• Insulating oils regeneration;
• New oils reception trials;
• Compatibility tests between nature and/or different aging states of oils;
• Characterization of vegetable oil behavior;
• Tests to characterize the state of lubricating oils, transmission oils efforts and dielectric solvents;
• Consulting on online monitoring;
• Post-mortem analysis of transformers;
• Specialized technical support in chemical products acquisition (e.g. silica gel; dielectric solvents);
• Development of studies in the field of insulating materials.
We are dedicated to a preventative vigilance of electrical equipment, through diagnosis obtained by the analysis of insulating oils in order to assess the equipment condition, thus enabling our customers a better way to manage their assets.