3.4 ELECTRICAL CONNECTIONS
3.4.0. General points
The installation must comply with the electrical schematics
attached in Section 5
Check that all the protection devices are correctly
connected and in good working order.
The assembler has the responsibility to mechanically and
electrically protect the generator within the best practice
rules and to secure any operation over the defined tender
(respect of capability curve ; overspeed …)
For low-voltage machines, power supply cables must be
connected directly to the machine terminals (without adding
washers)
For high-voltage machines, power supply cables should be
connected to separate terminals or to current transformer
terminals (without adding washers).
NOTE:
The gland plate is made of non magnetic material.
CAUTION
DO NOT ADD WASHERS TO THE POWER SUPPLY
CABLE TERMINALS OTHER THAN THOSE USED BY
THE MANUFACTURER OF THE ELECTRIC MACHINE
Check that the lugs are tightened.(refer to chapter 5.8)
CAUTION
ALL CURRENT TRANSFORMERS MUST BE
CONNECTED OR SHUNTED
CAUTION
A VOLTAGE TRANSFORMER MUST NEVER BE
SHUNTED
CAUTION
THE INSTALLED POWER CABLES MUST BE FIXED
AND SUPPORTED IN SUCH A WAY AS TO BE ABLE
TO WITHSTAND THE VIBRATION LEVEL REACHED BY
THE GENERATOR IN OPERATION (refer to chapter
2.1.3.4)
The power cables must not stress (push, pull, bend ...) the
generator terminals
3.4.1 Phase-sequence
3.4.1.1 Standard units ; IEC 34-8
Except by special request of the customer, the phase-
sequence is carried out using the IEC 34-8 standard.
An arrow located on the stator indicates the direction of
rotation.
Inside the terminal box a specific marking plate indicates
the specific generator phase sequence.
Clockwise rotation viewed
from the shaft drive end
Counter clockwise rotation
viewed from the shaft
drive end
The phases are marked:
U1, V1, W1.
The phases are marked:
U1, V1, W1.
Viewed when facing the
terminal box door the
terminals are :
U1, V1, W1
Viewed when facing the
terminal box door the
terminals are :
U1, V1, W1
The installer connects :
L1 --> U1
L2 --> V1
L3 --> W1
The installer connects :
L3 --> U1
L2 --> V1
L1 --> W1
U2
V2
W2
U1
V1
W1
L1
L2
L3
U2
U1
V1
W1
L3
L2
L1
V2
W2
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
14
