PG Resistors electrama

PUNCHED GRID RESISTORS
PUNCHED GRID RESISTORS
BCH un-breakable Punched Grid Resistors features an all welded current path for heavy duty applications. The units
have been made robust, versatile and yet economical for use as starting or speed control resistors for complete range
of AC and DC motors.
The resistor unit can meet the need of any industrial applications like :
•
•
•
•
Neutral grounding
AC / DC Cranes
Steel Mills
Slipring Motor starting
Features
•
Un-breakable Chromium Steel alloy grids in
Superior FeCrAL grade AISI406. Corrosion and
vibration resistant.
•
The low temperature coefficient of (0.00022
ohms/ohm/°c) resistance results in negligible
change in resistance from cold to hot.
•
The alloy has a high specific resistance - about 120
micro ohms cm. This results in 50% saving of the
material by weight for the same value of resistance.
•
Grid junction are TIG welded - continuous current
path unaffected by vibrations.
•
High capacity (upto 225A per bank) without
paralleling.
•
Steel and mica spacers.
•
Terminals designed for 2 conductors.
•
Compact and light in weight for equivalent current
capacity of other type of grids.
•
Sufficient number of tappings to simplify the
adjustment of resistance.
•
Resistance range from 0.1 Ohms minimum to 16
Ohms maximum per bank.
•
Multiple resistors in mounting frame for open
execution.
•
Resistors in enclosure with protection category IP
33 or IP 11 or higher.
•
Exclusive draw-out type enclosure.
Parts of Punch Grid Resistors
Grid element:
Individual grids are
stamped out of
aluminium chromium
steel alloy. The grids are
in 3 patterns, i.e 5, 9 or no
slots with different
thickness of materials.
Terminals:
2 types of terminals are
available depending on
current rating.
Welded joints:
All joints are T.I.G welded
to provide a continuous
current path ensuring
low loss.
Dual Terminal:
The dual terminal taps for
lower rating have 2
projections for connectors.
Floating Rod design:
Floating rod design in
end plate is an exclusive
feature which permits
'draw out' removal of grid
assembly from frame.
Allows for expansion and
contraction of individual
grids.
Square Terminal:
The square terminal taps for
higher rating are flat and when
provided with cast terminal
clamps are suitable for a
maximum of two 95 mm sq.
solid wires.
Three Rod Construction:
Special 3 rod construction
is used with the thin high
resistance grids to
provide extra mechanical
stiffness.
End Frame:
The formed end frame is
designed to provide rigid
support for grid assembly.
Resistor Banks:
Two standard bank sizes are
available.
19
(16) Wide Slots For 13
Mtg. Screws
39
A
B
Cooling:
Unique positioning of the
grids in the frame forms a
staggered grid pattern
for efficient cooling and
heat transfer.
Bank Dimensions (mm)
Type
A
B
Weight
(kg)
19
54
49
(152)
(251)
49
152
WL
673
635
22.7
Notes:
• Inter column connections are not in scope of BCH supply in given dimension.
• Bottom most bank assembly can be kept empty and terminals can be put in next unit to get higher distance from
gland plate to terminals.
• We can also supply back to back assembly.
Resistor Bank Assembly (draw-out)
Multiple resistance bank mounting frame is a sheet steel frame, sturdy in construction with welded top and bottom plates
having corrosion resistant finish. They are available in different sizes to accommodate from 3 to 6 resistor banks and can
be used with the WL bank. These mounting frames can be installed back to back and side by side and have provision for
bolting to floor. Resistor bank can be stacked within the mounting frame and can be drawn out from the front quite easily,
without disturbing the end plates.
Enclosure
Sheet steel enclosures of IP-11 and IP-33 as per IS-2147 are available for stacked assemblies with adequate ventilation.
IP-11 type enclosures are also available for back to back arrangement.
Dimensions
Dimensions of the enclosures are as given below. Figure 1 gives the overall dimensional drawing for Punched grid
resistor panel WL with integral terminal arrangement enclosure type IP 33 for single column & double column.
Current ratings
Table I give continuous current rating, type of terminals, resistance per bank & resistance per tap, and total number of
taps, based on NEMA requirements Table II & III gives the intermittent duty rating of WL type grids.
CANOPY
50
M.S. ANGLE
50 X 50 X 6 THK
(BLACK PAINTED)
40
40
40 50
50
NAME PLATE
525
875
25
H
P.G.R.
BANK
1730
1730
H
1730
FRONT/REAR
COVER
16B.G.PERF.
SHT.
50
DOOR
TERMINAL
STRIP
SIDE COVER
16 B.G.PERF.SHT
2
E
E
6-HOLES
14
+
+
+
L3
14
6-HOLES
+
+
+
CABLE ENTRY
520 X 225
CABLE ENTRY
520 X 225
+
+
45
+
2
2025
14
22.5
4-HOLES
45
E
E
2
L2
L1
+
2
1350
2
+
+
CABLE ENTRY
520 X 225
+
+
1260.0
45
Foundation Plan
Fig 1 : Overall dimensions wirh IP 11 (WL Type)
+
1935.0
+
426.0
E
675
75
E
2
75
75
300
775
HANDLE
471
475
M.S. CHANNEL
75 X 40 X 6 T
(BLACK PAINTED)
Current Rating - WL Type Banks
TABLE - I
Cat. Code
Type of Terminal
Continuous
Current Rating
Resistance
Per Bank
No. of Taps
Per Top
WL 10
S
225
0.1
0.020
5
WL 12
S
200
0.125
0.025
5
WL 20
S
150
0.200
0.020
10
WL 25
S
134
0.250
0.025
10
10
WL 32
S
118
0.320
0.032
WL 40
S
113
0.400
**
7
WL 50
S
100
0.500
**
7
WL 62
S
84
0.625
0.062
10
WL 80
S
75
0.800
0.800
10
WL 100
S
67
1.000
0.100
10
WL 125
S
64
1.250
**
7
WL 160
S
57
1.600
**
7
WL 200
S
54
2.000
0.250
8
WL 250
S
48
2.500
0.320
8
WL 320
D
43
3.200
0.400
8
WL 400
D
40
4.000
0.400
10
WL 625
D
33
6.250
0.625
10
WL 800
D
29
8.000
0.800
10
WL 1200
D
21
12.0
1.20
10
WL 1600
D
19
16.0
1.60
10
S - Square Terminal
D - Oval Terminal
** Non uniform tap values. Please contact our nearest sales office for details.
TABLE - II
Cat. Code
WL 10
WL 12
WL 20
WL 25
WL 32
WL 40
WL 50
WL 62
WL 80
WL 100
WL 125
WL 160
WL 200
WL 250
WL 320
WL 400
WL 500
WL 625
WL 800
WL 1200
WL 1600
Resistance
Per Bank Ohms
0.1
0.125
0.2
0.25
0.32
0.4
0.50
0.62
0.8
1
1.25
1.6
2
2.5
3.2
4
5
6.25
8
12
16
Continuous
Rating Amps
225
200
150
134
118
113
100
84
75
67
64
57
54
48
43
40
35
33
29
21
19
30 Sec.
0.1
900
520
430
360
350
300
280
225
180
195
160
155
120
95
90
85
80
75
41
33
Temporary Rating (Amps)
20 Sec.
10 Sec.
1250
1800
1175
1500
640
850
530
750
430
610
425
600
400
510
315
440
265
380
215
310
225
300
195
280
190
275
1650
200
122
165
115
160
98
150
90
140
85
120
49
65
40
58
Note : WM Type resistor banks also available. For details contact our nearest sales office.
5 Sec.
2500
2200
1200
1000
850
840
750
700
540
420
410
380
350
285
235
120
205
200
190
94
80