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  » Support / Repairs
Support / Repairs
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Valiadis Repair UnitOur Company has an organized repair unit, the unique in Greece certified with ISO 9001. We undertake the repair of any kind of motors (AC and DC). We have also developed a repair unit specialized in High Voltage Motors. In this respect, expertise engineers of our Company attended relevant seminars abroad. The HV Electric Motors repaired in our factory, are many years in operation with excellent results.

The Public Power Corporation of Greece selected and officially appointed our Company as the main repairer of LV, and of all High Voltage AC motors and DC motors as well. The evaluation criteria of the Public Power Corporation were based on its strict specifications and international standards, and in combination to our competitive prices.

 

 

 

A.    Electrical Tests on High Voltage AC stators:


All High Voltage AC stators repaired by our Company undergo strictly the following tests according to VDE 0530 and IEC-34 specifications:

Before the rewinding:
Magnetic induction measurements on stator iron core to detect the existence of any hot spots. If any hot spots are detected then we proceed with their total elimination.

After the rewinding:

  1. Megger tests between phases and ground
  2. Megger tests between phases
  3. Dielectric strength tests by applying 2Un+1000 Volts for one minute between phases and ground
  4. Polarisation Index and Absorption Factor Tests
  5. Capacitance measurement on each phase
  6. Dissipation factor losses (tangent delta)
  7. Ohmic resistance on each phase
  8. Routine tests after order, provided the whole motor is received

 

 

 

B.    Electrical tests carried out on repaired DC motors

Armature:

  • Megger tests between commutator and ground
  • Dielectric strength test between commutator and ground (2Un+1000V) for one minute
  • Volt drop test between commutator segments
  • Grawler test

Main field coils:

  • Megger tests between main field  circuit and ground
  • Measuring ohmic resistance of all coils interconnected
  • Measuring  volt drop on each coil

Commutating coils:

  • Megger tests between commutating coils circuit and ground
  • Measuring ohmic resistance of all coils interconnected
  • Measuring volt drop on each coil

Compensating winding:

  • Megger tests between commutating coils circuit and ground
  • Measuring ohmic resistance of all coils interconnected
  • Measuring volt drop on each coil

Routine tests:
If the whole motor is received, we proceed with routine running tests

 


C.    Guarantee period:


All parts of motors which have been repaired by our Company are subjected to a guarantee period of good performance for 12 months.

 

ATHENS, GREECE: 18, Gr. Lambraki Str., 141 23 Likovrisi. Tel: +302102817217. Fax: +302102814277. valiadis@valiadis.gr