Nidec LEROY-SOMER LSA 52.2 MHV User Manual

Test voltage
(VDC)
Criteria
(MΩ ; 40°C)
Stator: U ≤ 3 kV 500 200
Stator: 3 kV< U ≤ 6.6 kV 2500 1000
Stator: U > 6.6 kV 5000 1000
Rotor 500 100
Exciter (Stator & Rotor) 500 100
Excitation auxiliary
windings (AREP)
250 100
PMG (stator) 100 100
Heating element 500 100
Resistance Temperature
Detectors
500 100
If the insulation resistance is not measured with a tested
element à 40°C a corrective factor has to be used
R
m 40°C
= R
t
x K
t40
R
t
Measured insulation resistance
K
t40
Corrective factor
Curve LV for generator voltage ≤ 3 kV
Curve HV for generator voltage > 3 kV
0,01
0,1
1
10
100
-10
0
10
20
30
40
50
60
70
80
90
100
(°C)
Kt40°C
LV
HV
If the minimum insulation level is not reached, dry the
windings (refer to chapter 5.13)
5.10.2 Polarization index
The polarization index enables the status of the machine
insulating to be verified and gives an indication of the
pollution of the winding.
A poor polarization index may be corrected by a cleaning
and drying of the winding
The following measurements can be taken at any time
without any damage to the machine insulating material.
CAUTION
ALL ACCESSORIES MUST BE DISCONNECTED (AVR ,
EMC FILTER…)
REFER TO THE ELECTRICAL SCHEMATICS TO
IDENTIFY THE ACCESSORIES TO DISCONNECT
NOTE:
It must be done using a stable DC source.
Use a specific polarization index appliance (refer to
chapter 5.10.1 for the correct applied voltage)
Proceed for each phase
Open the winding star point
Apply the requested voltage
After 1 minute record the Insulating resistance "R
1 min
"
After 10 minutes record the Insulating resistance "R
10 min
"
1minute)=(t
10minutes)=(t
R
R
=
p
i
polarization index Diagnostic
p
i
< 1 Poor
2 <
p
i
< 1 Monitored
2 <
p
i
< 4 Good
p
i
> 4 Very good
E
lectric Power Generation
Installation and maintenance
5654 en - 2017.10 / a
LSA 52.2 MHV
Industrial Range Alternators - 4 pole
30

Nidec LEROY-SOMER LSA 52.2 MHV Specifications

General

Brand	Nidec
Model	LEROY-SOMER LSA 52.2 MHV
Category	Portable Generator
Language	English