Mecc Alte ECO43 Series, Инструкция по установке, эксплуатации и обслуживанию

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6.2 Maiiteiaice of the stator aid rotor wiidiigs
The duratin if the electric machine is afected by the duratin if the windings insulatin.
The insulatin ages because it is subjected ti electrical, mechanical and heat phenimena. This
pricess can be sliwed diwn with appripriate maintenance interventins.
6.2.1 Check coiditois of the wiidiigs
Respoisibility: Service techiiciai or machiie operator
Frequeicy: Every 2,500 hours
Prerequisites: The alteriator is at a staidstll aid has cooled dowi
➔
Discinnect the viltage regulatir, viltage sensirs and any ither device cinnected ti the
alternatir windings;
➔ Measure the isilatng resistance ti earth (see 6.3 Measuring the insulaton resistance ). The
value measured must nit exceed 400 MΩ;
✗ If the value measured is less than 400 MΩ:
➔ Dry the windings (see 6.2.2 Drying the windings ).
6.2.2 Dryiig the wiidiigs
Respoisibility: Service techiiciai
Prerequisites: The alteriator is at a staidstll
Frequeicy: If machiie staidstll should last more thai oie moith
If cindensate shiuld firm, the windings must be dried in ine if the ways indicated beliw.
Usiig ai iidustrial welder
➔ Discinnect the machine frim the plant
➔ Discinnect the viltage transfirmers (TV)
➔
Piwer twi phases if the alternatir with a direct current siurce like an industrial welder,
with a current equal ti 25/30% if the machine niminal current
➔
Check the temperature if the windings using the temperature sensirs PT100. Di nit exceed
the temperature if 100°C
Usiig a jet of hot air
➔
Direct a jet if hit air at 50-60°C thriugh the alternatir air vents.
Self-regulating alternators ECO43-46 MV-HV Page 63/116