General Description; Generator (Arep); Excitation System - Nidec LEROY-SOMER LSA 52.2 MHV Installation And Maintenance Manual

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Installation and maintenance
Electric Power Generation
5654 en - 2017.10 /
LSA 52.2 MHV
Industrial Range Alternators - 4 pole

1.2 GENERAL DESCRIPTION

1.2.1 Generator (arep)

The synchronous generator is an alternating-current
machine, without ring or brush. The machine is cooled by
the flow of air through the machine.
For a better comprehension, use the drawings of chapter
10.
The Automatic Voltage Regulator (item 6) supplies the
exciter field (static part ; item 1) in DC current.
The Exciter works as a reversed alternator.
The Exciter armature (rotating part ; item 2) generate a
three-phase current which supplies the Rotating diodes
bridge (rotating part ; item 3)
The Rotating diodes bridge (rotating part ; item 3) rectifies
the three phases current in DC current which supplies the
Revolving field (rotating part ; item 4)
The revolving field (rotating part ; item 4) excites the
alternator armature (static part ; item 5) which generates a
three phases current
6
H1
H3
5 1
3
4
2
1- Excitation field winding
2- Excitation armature
3- Rotating diodes bridge
4- Revolving field
5- Alternator armature
6- Automatic Voltage Regulator
H1- AREP winding detect harmonic 1
H3- AREP winding detect harmonic 3

1.2.2 Excitation system

The excitation system is fitted at the Non Drive End side
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