Portfolio | Εργαστήριο Υψηλών Τάσεων https://highvoltages.ece.ntua.gr/en/ Ε.Μ.Π. Tue, 27 Apr 2021 11:40:00 +0000 en-US hourly 1 https://wordpress.org/?v=5.7.7 https://highvoltages.ece.ntua.gr/wp-content/uploads/2021/03/cropped-favicon-32x32.png Portfolio | Εργαστήριο Υψηλών Τάσεων https://highvoltages.ece.ntua.gr/en/ 32 32 CALIBRATIONS https://highvoltages.ece.ntua.gr/en/projects/calibrations/ https://highvoltages.ece.ntua.gr/en/projects/calibrations/#respond Thu, 08 Apr 2021 09:02:04 +0000 http://highvoltages.ece.ntua.gr/projects/calibrations/

Calibrations

  • Electrostatic Discharge (ESD) generators

    high voltage

  • Burst generators

    laboratory

  • Surge generators

    voltage laboratory

  • Voltage dips, short interruptions and voltage variations equipment

  • Inductive coil (Equipment for tests according to EN 61000-4-8)

We will be very happy to hear from you!

Please do not hesitate to contact us for any information you need.

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]]> https://highvoltages.ece.ntua.gr/en/projects/calibrations/feed/ 0 Electromagnetic Compatibility (EMC) and Immunity tests and measurements https://highvoltages.ece.ntua.gr/en/projects/electromagnetic-compatibility-emc-and-immunity-tests-and-measurements/ https://highvoltages.ece.ntua.gr/en/projects/electromagnetic-compatibility-emc-and-immunity-tests-and-measurements/#respond Thu, 08 Apr 2021 08:58:38 +0000 http://highvoltages.ece.ntua.gr/projects/electromagnetic-compatibility-emc-and-immunity-tests-and-measurements/

Electromagnetic Compatibility (EMC) and Immunity tests and measurements

Since 2008 the High Voltage Laboratory is accredited according to ELOT ΕΝ ISO/IEC 17025 for a large variety of Electromagnetic Compatibility (EMC) tests and measurements, associated with most of the modern commercial and industrial Product Standards, continuously investing in the up-to-date scientific training of the personnel and monitoring the ever-changing requirements of International, European and National Standardization

  • Measurement of conducted emissions (Standards ELOT ΕΝ 55032, ΕΝ 55014-1, EN 55015, EN 55011 etc) in power ports of equipment in the frequency range from 9kHz up to 30MHz, which aims to certify that neighboring apparatus is not affected by the disturbances that are conducted through the interconnecting cables of the equipment.

agomenes diataraxes

  • Measurement of radiated emissions (Standards ELOT ΕΝ 55032, ELOT ΕΝ 55014-1, ELOT EN 55015, ELOT EN 55011 etc) in the frequency range from 150kHz up to 18GHz, which aims to certify that neighboring apparatus is not affected by the disturbances emitted in terms of electromagnetic field from the enclosure of the equipment.

  • Measurement of discontinuous disturbances (Std ELOT ΕΝ 55014-1): transient conducted emissions generated by equipment with main functions that are carried out with motors and switching devices.

diakoptomones diataraxes

  • Measurement of disturbance power (Standard ELOT ΕΝ 55014-1): measurement of continuous generated electromagnetic power disturbance in the frequency range from 30MHz up to 300MHz.

diataraxes isxios

  • Measurement of the current harmonics (ELOT ΕΝ 61000-3-2) emitted by the equipment to its power supply network, thus contributing to maintaining the power quality of the electricity network.

armonikes

  • Measurement of voltage fluctuations and flicker (Standard ELOT ΕΝ 61000-3-3) which aims to certify that the equipment under test does not cause variations in its voltage supply.

diakimansis tasis

  • Immunity to Electrostatic Discharge test (ELOT ΕΝ 61000-4-2), aiming to certify that the equipment will not be disturbed by electrostatic discharges generated from other charged devices or operators.

hlektrostatikh ekfortosi

  • Immunity to RF Electromagnetic Radiated Field test (Standard ELOT ΕΝ 61000-4-3), which aims to certify that the equipment will operate properly in an environment with radiated radio-disturbances.

atrosia se pedio

  • Immunity to Bursts test (Standard ELOT ΕΝ 61000-4-4), which aims to certify that the performance of the equipment will not deteriorate in the presence of conducted disturbances caused by fast switching operations of contacts and loads.

grigora metavatika fenomena

  • Immunity to Surges test (Standard ELOT ΕΝ 61000-4-5), which aims to certify that the equipment will continue to perform properly when subjected to overvoltages or overcurrents caused e.g. by a lightning strike.

IMG_7270

  • Immunity to Conducted Electromagnetic Field test (ELOT ΕΝ 61000-4-6), which aims to certify that the performance of the equipment will not deteriorate in the presence of conducted RF disturbances.

atrosia se agomenes

  • Immunity to Power Frequency Magnetic Field test (Standard ELOT ΕΝ 61000-4-8), which aims to certify that the equipment will continue to perform properly in the presence of power frequency magnetic field.

atrosia se magnitiko pedio

  • Immunity to Voltage Dips and Short Interruptions test (Standard ELOT ΕΝ 61000-4-11), which aims to certify that the equipment will not be affected by variations or interruptions of its power supply.

vithisis tasis

  • Immunity to transient phenomena test on power lines and immunity test (Standards ISO 7637-1, 7637-2, 7637-3, ISO 16750-1, 16750-2) to power supply interruption for on board vehicle equipment, which aims to certify that the equipment in the environment of a vehicle will not be affected by transient phenomena and specific types of variations of its power supply.

atrosia se metavatika

We will be very happy to hear from you!

Please do not hesitate to contact us for any information you need.

[contact-form-7]
[contact-form-7]

The post Electromagnetic Compatibility (EMC) and Immunity tests and measurements first appeared on Εργαστήριο Υψηλών Τάσεων.

]]> https://highvoltages.ece.ntua.gr/en/projects/electromagnetic-compatibility-emc-and-immunity-tests-and-measurements/feed/ 0 Electrical tests / measurements https://highvoltages.ece.ntua.gr/en/projects/electrical-tests-measurements/ https://highvoltages.ece.ntua.gr/en/projects/electrical-tests-measurements/#respond Thu, 08 Apr 2021 08:46:29 +0000 http://highvoltages.ece.ntua.gr/projects/electrical-tests-measurements/

Electrical tests / measurements

RENEWABLE ENERGY PARKS – HIGH VOLTAGE SUBSTATIONS

  • Earth resistivity measurement

The measurement of the earth resistivity (IEEE Std. 81) constitutes the first and primary stage for the optimal design of a grounding system. This kind of measurement is conducted upon multiple axes on the ground surface and in multiple soil depths in order to approach the multilayer earth structure at the site of interest before the installation of grounding systems.

eidiki antistasi edafous
  • Ground resistance measurement

The ground resistance measurement (IEEE Std. 81, ANSI IEEE Std. 80:2013, HD 637) is conducted after the full installation of a grounding system and, combined with the step and touch voltage measurements, indicates a sign of the grounding system efficiency. This particular measurement is usually necessary for receiving the functional certificate of the facilities and, in many cases, construction specifications and state-actors standards raise particular requirements for this resistance value.

antistasi giosis
  • Step & touch voltage measurement

The measurement of step and touch voltages (IEEE Std. 81, HD 637) is conducted after completing the construction of the facilities and aims to ensure personnel safety. Both the step voltage values developed at the facility area and the touch voltage values near to accessible grounded metallic structures must not exceed specific safety limits defined by national standards and requirements.

vimatikes taseis

CABLES – TRANSFORMERS

  • Dielectric strength under impulse voltage test on cables and transformers (20 kV – 1.4 ΜV)

This procedure includes type tests (Standards IEC 60502-2, IEC 60840, IEC 62067, BS 7870-4.10, BS 7870-4.20, BS 7835, BS 6622, SANS 1339) for testing the insulation strength against impulse voltages (1.2/50μs). The acceptance criterion is the non-perforation of the insulation upon the tested cable or transformer.

kalodia
  • Field testing of medium voltage shielded power cables using very low frequency (VLF) (40kV/0.1Hz)

VLF testing (Standards IEEE Std 400.2, ELOΤ HD 620, ELOT ΕΝ 60229)  aims to note and confirm the successful field installation of the tested cable, so that the cable can be energized without any problems or restrictions. During the procedure:
a) the cable is tested for any mechanical stress during the installation which could cause degradation of the cable insulation and
b) the successful installation of the cable joints and terminations along its length are tested, so that the cable can be energized and serve according to the current specifications.

VLF_1
VLF_2

CRITICAL HOSPITAL AREAS

  • Measurement of resistance to earth

Measurement of resistance to earth, surface and vertical resistance (Standard ELOT ΕΝ 1081)  of resilient floor coverings and installed floors in critical hospital areas (Surgeries, Intensive Care Units, CT / MRI etc.) for the safety of patients, doctors and nursing staff as well as for trouble-free functioning of equipment.

nosokomia

POWER TRANSMISSION LINES, SUBSTATIONS, HIGH VOLTAGE CENTERS

  • Measurement of low frequency magnetic and electric fields

Power transmission and distribution lines and all the types of the equipment of the ultra-high voltage centers, of the high voltage sub-stations and of the distribution centers of the electricity network are arrangements producing Extremely Low Frequency (ELF) electric and magnetic fields. The measurement of the electric and magnetic field intensity (Standards ELOT ΕΝ 61786-01, IEC 61786-2, ANSI IEEE Std. 644) in locations where there is human access to transmission lines and sub-stations of the electric network assures the compliance with the safety limits set by international organizations for the exposure of the public to such fields.

We will be very happy to hear from you!

Please do not hesitate to contact us for any information you need.

[contact-form-7]
[contact-form-7]

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