Nidec LSA 52.3 - Electrical Connections; General Information; Phase Order; Standard Units; IEC

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
__________________________________________________________________________________________________
13
3.4 ELECTRICAL CONNECTIONS
3.4.0. General information
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, etc.).
For low-voltage machines, power supply cables must be
connected directly to the machine terminals (without adding
washers, etc).
For high-voltage machines, power supply cables should be
connected to separate terminals or to current transformer
terminals.
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.
Make sure the lugs are tight. Refer to chapter 5.8.
CAUTION:
ALL CURRENT TRANSFORMERS MUST BE
CONNECTED OR SHUNTED.
CAUTION:
THE VOLTAGE TRANSFORMER MUST NEVER BE
SHUNTED.
CAUTION:
THE INSTALLED POWER CABLES MUST BE
FASTENED 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, flex, etc.) the
generator terminals.
3.4.1 Phase Order
3.4.1.1 Standard units; IEC 34-8
Except by special request of the customer, the phase-
sequence is chosen as per the IEC 34-8 standard.
An arrow located on the front bearing indicates the
direction of rotation.
In 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 identified:
U1, V1, W1.
The phases are identified:
U1, V1, W1.
The installer connects the
following:
L1 --> U1
L2 --> V1
L3 --> W1
The installer connects the
following:
L3 --> U1
L2 --> V1
L1 --> W1
U2
V2
W2
U1
V1
W1
L1
L2
L3
U2
U1
V1
W1
L3
L2
L1
V2
W2