HV and EHV Testing Laboratory

A necessary condition for the reliable and safe operation of power equipment, especially high-voltage equipment, transformers and generators, is the good condition of their electrical insulation system, given the characteristics of solid insulation and insulating oil. On the basis of regular diagnostic monitoring of these parameters and in the context of data from the operational life of the equipment, the professional workplace can not only evaluate the current state of the electrical insulation system, but also formulate proposals for measures, prevention and a qualified estimate of further operational reliability or service life. Udestimation or even omission of these diagnostic activities by the power plant operator can lead to dramatic emergency situations, endanger human lives and health, cause serious environmental damage and, last but not least, cause power outages with consequent economic damage. Timely a thorough diagnosis of the operational status of power equipment is also often a condition when concluding insurance contracts between power equipment operators and insurance companies.

La laboratorio testo proporciona:

• diagnostics of insulation systems of electric rotary machines (hydro-alternators, turbo-alternators, VN motors)
• Diagnostica di sistema di insulazione di macchine elettrico non rotativo (transformatori di potenza e strumenti, grommets)
• testes de interruptores de circuitos y arrestores de surges
• tests between threaded insulation with current pulses (Baker)
• Diagnostics of electrical power equipment filled with SF6
• Diagnostica di parametri di insulazione di switche
• Measurement of partial discharges of rotary machines
• Detection of partial discharges by corona camera
• (FRA) to assess the possible
• internal deformation of the winding
• Dielectric spectroscopy in the frequency domain (IDAX) and determination of water content in paper insulation of transformers
• Chromatographic analysis of gases dissolved in the electro-insulating fluid
• Vibration measurement of drives, especially water turbine hydrogenerators
• Thermal Imaging Measurement
• Indications of ozone
• testas de trabajo y equipamento protectivo
• Increased voltage tests (mobile voltage source up to 350 kV/1a ss in c.)
• especialiseerde fieldmetingen met VVN, VN en NN metrotechnologie
• consulting activities in the above-mentioned areas

La laboratorio di testo anche includono un centro di analisi chimica especializzato, che fornece le seguenti assays supportati per fluidi elettrici per determinare:

• valori di voltazione di risolvere di insulatori liquido su frequenza di rete
• Water content in insulating oil
• acidity numbers of mineral insulating oils
• mineral insulation oil density
• intersurface tension oil — water
• , permittiviteit a v DC voltage
• the content of gases dissolved in the mineral insulating oil, including the total gas content
• slurries insoluble in n-heptane
• the number and size of particles in insulating fluids by a counter
• Thermal - Oxidative Stability (TOS) of Mineral Insulating Oils
• presence of corrosive sulfur (qualitatively and quantitatively as DBDS)
• Inhibitor content
• content of passivators in mineral oils by HPLC method
• content of PCBs (polychlorinated biphenyls) in mineral oils by gas chromatography
• and performing laboratory regeneration

and for solid insulation by determining:

• water content in solid insulation
• PPS values (average degree of polymerization)
• furan substances released from solid paper insulation into oil