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Crimp Terminals
Crimp Terminals
Bimetallic Terminals (Lugs)
Bimetallic terminals for connecting power cables with aluminium conductors to copper
terminals and bus bars on equipments are made by STI. A bimetallic terminal consists of
copper palm integrated to an aluminium barrel by process of friction welding.
Aluminium conductors of a power cable is connected to bimetallic terminal inside the
aluminium barrel and secured by compression (crimping) tools. Friction welding done
in special machines ensures a positive bond of the two metals at the interface by fusion.
The copper palm can be connected either to bushing of equipments or to a copper
bus bar by means of high tensile bolts to recommended torque. Bimetallic terminals
eliminate burn out of copper terminals crimped to aluminium conductors. They are
standard connectors for connecting cables with aluminium conductors to bushing of
Ring Main Units (RMUs) and to copper bus bars. Bimetallic terminals eliminate burnout of
terminals occurring due to following methods of connection:
• Copper terminals crimped to aluminium conductors.
• Alumiium terminals crimped to aluminium conductors and connected to copper
Temp Rise at terminal contact point with bushing of R.M.U.
250
Temp in Degree C
200
150
Bimetallic lug
Aluminium lug
100
50
0
0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00 4:30 5:00 5:30 6:00
Time in Hrs
Regular Series
Regular Series
Regular Series
Bi-Metallic Lugs
For cables with aluminium, compact round
and pre-rounded sector shaped conductors.
Al. barrel friction welded to solid copper palm
O
AL CU
L1
C A
W
45
W
L
O
13/17
35
5.5
12
125
13/17
35
6.5
12
125
13/17
35
8.5
14
125
13/17
35
9.5
16
125
13/17
35
11.0
18
125
13/17
35
12.5
22
125
13/17
35
13.7
23
135
13/17
35
15.5
25
135
13/17
35
17.0
28
135
13/17
*
35
19.5
32
135
13/17
*
35
22.5
34
145
13/17
**
35
25.0
38
155
44
200
60x60 28.5
**
Note: Dimension ‘O’ can be to local standards/Customer
Specification
44
200
60x60 31.7
*1-hole to customer specification
50
260
80x80 35.7
**2-holes/4-holes to customer specification
58
260
80x80 42.0
Ring Type Non Insulated
copper