ABB NAL Series User manual

Indoor Air Switch-disconnector, NAL/NALF
Rated voltage: 12, 17.5, 24 and 36 kV
Rated current: 400/630, 800 and 1250 A
Mounting and operation manual
The NAL family of switch-disconnectors is characterized
by its compact, modular design and broad functionality. With
their unique design for extinguishing the electric arc and high
switching capacity, they represent an attractive solution, as main
switching apparatus for applications in enclosed switchgear and
compact transformer stations. In combination with CEF current
limiting fuses, they provide reliable control over the full range of
overload currents.
Main areas of application NAL switch disconnectors:
– as line and transformer switches within distribution networks,
– as motor switches,
– as capacitor switches.
Introduction
The NAL/NALF switch-disconnector system is based on a modular
principle. The basic unit consists of a frame with insulators
and current carrying elements. Two different types of operating
mechanisms: snap action mechanism type K or stored spring energy
mechanism type A, can be mounted on the frame. Fuse bases type F
with or without fuse tripping mechanism, and earthing switch type E/
EB, suitable for both direct monting and free standing components,
complete the basic switch-disconnector equipment. These modules
can be easily configured, according to customer requirements.
Accessories such as shunt trip, under-voltage release, auxiliary
switches, motor operation and various systems for manual operation
can easily be added.
The NAL/NALF brand is recognised globally and more than 600,000
switches have been produced so far. The design is subject to
continuous development to meet changing customer needs.
Main Product Features
NALF is the ideal solution for the protection of the majority of faults in
modern electrical networks. It combines NAL, which interrupts load
currents (up to 1250A) and small fault currents, with the fuse base (F)
for breaking large short-circuit currents.
This switch-disconnector range meets IEC Publication 60129, 60265,
60694, GOST 1516.3-96, GOST 17717-79, and CSA Standard No.
C22.2, No. 193, and IEC 62271-105, regarding switches for general
use and for safe switching coordination between switch-disconnectors
and a current limiting fuse.
The NAL version for ANSI standard is called VersaRupter. It meets
ANSI Standard No. C37.20.4.
The specified NAL/NALF switch-disconnectors are listed as certified by
the Canadian Standard Association. Some VersaRupter styles are UL
listed, in terms of compliance with relevant safety requirements, in order
of their release for use in each region of the US and installations carried
out in accordance with the UL standard.

2 NAL/NALF – Mounting and operation manual
Triple-pole switch-disconnector type NAL
and fuse switch-disconnector type NALF for indoor installation
1.0 Switch-disconnector type NAL, alternative assemblies ...... 3
2.0 Installation................................................................................ 3
2.1 Preparation of the switch for installation............................... 3
2.2 Preparation of the supporting structure ................................ 3
2.3 Installation of the disconnector.............................................. 3
3.0 Adjustment of the hand operating, mechanism type HE .... 4
3.1 K-mechanism .......................................................................... 4
3.2 A-mechanism .......................................................................... 4
4.0 Mounting the mechanism on the switch............................... 5
4.1 Test operation of A-mechanism............................................. 5
5.0 Mounting the hand operating mechanism type HE ............. 6
5.1 Instruction of installation and adjustment of switch-
-disconnector type NAL/NALF with hand operation
mechanism HE........................................................................ 6
6.0 Mounting of fuse base.......................................................... 10
6.1 The switch must be open and the main springs
not charged ........................................................................... 10
6.2 Mounting of the fuse tripping............................................... 10
6.3 Adjustment of the fuse tripping............................................ 10
6.4 Fuse tripping. Control ...........................................................11
7.0 Mounting of eartch switch type E and eartch switch
type LCES ............................................................................. 12
7.1 Mounting of eartch switch to the switch-
-disconnector type NAL ....................................................... 12
7.2 Mounting the eartch switch to the fuse-switch-
-disconnector type NALF ..................................................... 12
8.0 Mounting the mechanical interlock between switch-
-disconnector and eartch switch ......................................... 12
9.0 Mounting the shunt release ................................................ 13
10.0 Mounting the auxiliary switch............................................... 13
11.0 Mounting the auxiliary switch for E-EB
earthing switch, excluding LCES......................................... 14
12.0 Mounting of NM motor drive................................................ 17
13.0 Service and maintenance..................................................... 21
14.0 Replacement of parts (12-24 kV)........................................ 23
14.1 Replacement of contact knife with draw bar...................... 23
14.2 Replacement of fixed contact on the opening side ........... 24
15.0 Replacement of the arcing chamber................................... 24
16.0 Replacement of insulators ................................................... 24
16.1 Hollow insulators with arcing chamber ............................... 24
16.2 Pivot side support insulator.................................................. 24
17.0 Insulator for fusebase and quick make earthing switch ... 25
18.0 Changing parts in NAL 36 kV .............................................. 25
18.1 Changing contact knives...................................................... 25
18.2 Changing draw bar ............................................................... 26
18.3 Changing the supporting insulator ...................................... 27
18.4 Changing the hollow insulator ............................................. 27
18.5 Changing the piston with piston rod ................................... 28
19.0 Technical specification for NAL/NALF switch-
-disconnectors NAL 12 - 17.5 - 24 - 36/6 - 12.5 A - K..... 29
20.0 Liabilities ................................................................................ 30
21.0 Reference list of fuses..........................................................31
22.0 Environmental declaration.................................................... 32

NAL/NALF – Mounting and operation manual 3
Fig. 1 Switch-disconnector type NAL
Triple-pole switch-disconnector type NAL
and fuse switch-disconnector type NALF
1.0 Switch-disconnector type NAL, alternative assemblies
The Switch-disconnector NAL is supplied by the factory as follows:
1.1 Fully assembled with mechanism and auxiliaries. See item 2.0
1.2 Switch main frame, mechanism and auxiliaries as separate
components, see item 4.0
2.0 Installation
2.1 Preparation of the switch for installation. Fig. 1
For switches with A-mechanisms, the contact knives must be
fully opened by hand and the draw bars connected to the cranks.
Before the switch is test operated, it should be checked that the
surfaces of the main contact are covered by contact grease
(recommended grease: ISOFLEX TOPAS NCA 52).
Test operations
Switches with K-mechanism will close when the operating shaft
is turned anti-clockwise. The switch will open when the operation
shaft is turned clockwise. (Clockwise/anti-clockwise as seen from
the mechanism side of the switch).
When operating switches with A-mechanism, the opening spring is
first charged and latched by turning the operating shaft clockwise.
Turning the shaft anti-clockwise charges the closing spring and
the switch closes. The switches open when the operating shaft is
turned clockwise.
Caution!
Keep well clear of contact knives when operating the switches.
2.2. Preparation of the supporting structure
The disconnectors are intended for vertical or horizontal opera-
tions. The design of a supporting structure shall consider the
geometrical configuration of the disconnector/vertical or horizontal/
and minimal clearances to both earthed and live parts. The sup-
porting structure shall be rigid enough to avoid some deformation
of the disconnector base. All the touching points of the supporting
structure and the disconnector base shall lay in the same plane.
For construction of the supporting structure it is recommended
to use some U-iron or angle iron components. The disconnector
shall be fixed by means of four M12 bolts arranged according
to the dimensional drawing.
2.3. Installation of the disconnector
In the course of installation of the disconnector particular attention
should be paid not to deform the base of the disconnector, other-
wise some defects will occur such as the following:
1. excessive rise of the starting moment of a force on the discon-
nector shaft,
2. non-simultaneity of the contacts which should not exceed
3 mm in normal conditions,
3. deterioration of contacts touch interface in the closed position,
a clearance gauge of 0.05 mm in thickness should not fit bet-
ween the fixed and moving parts of correctly installed
disconnector,
4. displacement of the symmetry plane of moving contacts in rela-
tion to the pole symmetry plane what results in asymmetrical
touching of the fixed and moving contacts. In addition, the ope-
rating lever will hit the lock.
To avoid these defects at resulting from samll deformations of the
supporting structure it is recommended to tighten initially three
bolts only when fixing the base. Some additional washers shall be
placed under the fourth bolts to prevent deformations of the dis-
connector base when tightening the fourth bolt.

4 NAL/NALF – Mounting and operation manual
3.0 Adjustment of the hand operating, mechanism type HE
3.1 K-mechanism. Fig.2
(Switch in the open position)
Closing
Arrester ring S, on the front shaft of the HE-mechanism is remo-
ved, see Fig. 8. The operating handle is turned clockwise until the
switch closes. Mount the arrester ring.
Opening
Turn the handle clockwise and the switch opens. Test the arrester
ring for correct functioning.
3.2 A-mechanism. Fig. 3
Closing
Remove the arrester rings on the front shaft of the hand operating
mechanism, see Fig. 8. Turn the operating handle anti-clockwi-
se until the opening spring is charged and latched. Mount the
arrester ring. Turn the operating handle clockwise until the switch
closes. Test the arrester ring for correct functioning.
Opening
After having pulled out the arrester ring, turn the operating handle
anti-clockwise. The switch opens after approx. 20° rotation.
For step-by-step instructions for installation of the switch-discon-
nector with the HE hand operation mechanism, see item 5.1.
Fig. 2 Switch-disconnector type NAL with K-mechanism Fig. 3 Switch-disconnector type NAL with A-mechanism

NAL/NALF – Mounting and operation manual 5
4.0 Mounting the mechanism on the switch. Fig. 4
The mechanisms are mounted on the right hand side of the
switch main frame and the switch is normally operated from the
same side (mechanism-side). When the switches have to be
operated from the opposite side, an operating shaft must be con-
nected, see Fig. 6. The mechanism clutch is brought together with
the clutch of the hollow main shaft and the mechanism is fixed to
the switch frame.
Note: Contact knives in open position
Normally the switch disconnector is delivered without shaft exten-
sion for left hand side operation.
4.1. Test operation of A-mechanism
After having mounted the mechanism to the switch frame, check
that the latch H is in correct position by pulling it back to the
outermost position, see Fig. 5.
Test operation see item 2.1.
Fig. 4
Fig. 6
Fig. 5
Fig. 4 Mounting the mechanism on the switch | Fig. 5 Shunt trip mounted on the A-mechanism | Fig. 6 Shaft extension for the
left-hand side operation
H

6 NAL/NALF – Mounting and operation manual
5.0 Mounting the hand operating mechanism type HE
The bevel gears are mounted with the switch in open posi-
stion as shown in Fig. 7.
The inclination of the operating tube must not exeed 40°, see
Fig. 8. Drilling of the operating tube, see Fig. 9.
5.1 Instruction of installation and adjustment of switch di-
sconnector type NAL/NALF with hand operation mechanism
HE.
Step by step.
1. Take out the NAL from the box. Open the contact knives to
maximum position and connect the drawbars (disconnected for
transport) with shaft. Install NAL on support construction in
open position, see Fig. 10.
2. Opening spring is not charged (apply to NAL/NALF with
A mechanism), see Fig. 11.
3. Install the bevel gear on the NAL/NALF shaft (and earthing
switch). Be sure the wheels are in the correct position – the lar-
ger should be located to the right side – on switch disconnector
– on earthing switch – to the left, see Fig. 12.
4. Install the hand operation type HE. Between cardanic joint and
bevel gear. Put the connection rod (pipe φ=26.9 mm) between
the cardanic joint and the bevel gear. Mark the position for the
bolt hole and drill a hole not more than φ=10 mm for this bolt,
see Fig. 13.
Fig. 7
Fig. 9
Fig. 10 Fig. 11
Fig. 7 NAL disconnector with earthing switch | Fig. 8 Hand operating mechanism | Fig. 9 Connection rod | Fig. 10-11 Mounting of hand opera-
ting mechanism HE
S
F
Max. 40°
Fig. 8

5. Take out the Seeger ring, spring and nut, see Fig. 14.
6. Slide out the arrestor ring from the shaft, see Fig. 15.
7. The shaft should loosely rotate loosely after taking out the
arrestor ring, see Fig. 16.
8. Put the operating handle on the splined end. Turn the handle
anticlockwise to charge A mechanism opening spring (apply to
A mechanism), see Fig. 17.
NAL/NALF – Mounting and operation manual 7
Fig. 12
Fig. 14
Fig. 16
Fig. 13
Fig. 15
Fig. 17
Fig. 12-17 Mounting of hand operating mechanism HE

9. A mechanism opening spring is charged, see Fig. 18.
10. Turn the handle to the left and right for test, see Fig. 19.
11. Put the arrestor ring on the shaft, see Fig. 20.
12. Slide out the arrester ring to the position where it is possible to
turn the handle clockwise and close disconnector, see Fig. 21.
8 NAL/NALF – Mounting and operation manual
Fig. 18
Fig. 20
Fig. 19
Fig. 21
Fig. 18-21 Mounting of hand operating mechanism HE

13. Check if the arrestor ring and switch disconnector are in
locking position, see Fig. 22.
14. If NOT (as in picture 22) slide out the arrestor ring from the
shaft and turn 2-3 teeth to the right, see Fig. 23.
15. Correctly position the arrestor ring in closed position,
see Fig. 24.
16. Check the opening spring is charged. Upper picture shows
the charged position of that spring. After adjustment the See-
ger ring, spring and nut should be put back on the HE shaft,
see Fig. 25.
NAL/NALF – Mounting and operation manual 9
Fig. 24
Fig. 22
Fig. 25
Fig. 23
Fig. 22-25 Mounting of hand operating mechanism HE

10 NAL/NALF – Mounting and operation manual
Fig. 26 Switch-disconnector type NALF mounted on the pivot side Fig. 27 Switch-disconnector type NALF mounted on the oppening side
E
6.0 Mounting of fuse base
6.1 The switch must be open and the main springs not
charged
When mounting a fuse base with three post insulators, one set
of fuse contacts and possibly fuse trip accessories are mounted
directly on the switch terminals, see Fig. 26 or 27.
6.2 Mounting of the fuse tripping. Fig. 30
1. Lower part of bearing (8) is fixed to terminal (10) by one
screw (9).
2. The lever (13) together with the fuse trip flap (15) are placed
in the lower bearing (8) and locked by means of upper part of
bearing (14).
3. The released rod (11) is mounted in the lever (13).
4. The drive ring (2) is mounted to the release shaft (1) on the RHS.
5. The bearing (5) and washer (6) is mounted on the release shaft
(1) on the LHS and secured by split-pin (7).
6. Disc (3) is mounted to the release shaft (4) of the mechanism.
7. The release rods (11) are mounted onto the hooks (12) on the
release shaft (1).
6.3 Adjustment of the fuse tripping. Fig. 30.
– the adjustment applies to switch disconnectors with fuse links
and fuse tripping,
– the adjustment must be made with both operating springs in the
mechanism in uncharged position, but the releasing spring in
the mechanism has to be charged as mentioned under control
point 6.4 point 1.
1. The split pin (7) is removed and the release shaft (1) together
with the drive ring (2) is pushed in the direction of the arrow
until the tapped connection is free from disc (3).
2. The release rod (1) with the drive ring (2) is turned and ajusted
to a hole in the disc (3), while the ajustment of the fuse trip flap
(15) and its distance to the strike pin of the fuse link must be
checked, see Fig. 28.
Remark:
– Following adjustment according to above the fuse switch di-
sconnector must open by when tested in all phases,

NAL/NALF – Mounting and operation manual 11
3–6 mm
15 14 13
7 5 6 712
11
1
11
9
8
1 2 3 4
MEC.
10
max. e÷8 mm
e (DIN 43625)
3–6 mm
15 14 13
7 5 6 712
11
1
11
9
8
1 2 3 4
MEC.
10
max. e÷8 mm
e (DIN 43625)
3–6 mm
15 14 13
7 5 6 712
11
1
11
9
8
1 2 3 4
MEC.
10
max. e÷8 mm
e (DIN 43625)
Fig. 28 Fuse tripping | Fig. 29 Tripping rod | Fig. 30 Fuse tripping comlpeted | Fig. 31 A-mechanism
– after fuse interruption the mechanism shall be blocked against
another operation until the fuse link has been replaced.
6.4 Fuse tripping. Control
1. Turn the operating shaft E, see Fig. 26 clockwise, max 60°, and
return the operating handle back to the neutral position (ope-
ning spring housing F, see Fig. 31, must not be latched),
2. Mount a new fuse-link, or a test fuse which is in accordance
with DIN 43625, in one of the phases. Dimensionally the fuse
link then will have the same dimensions as ABB-CEF fuse-links,
3. If the distance between the fuse clips is longer than described
– max e + 8 mm, the ajustment (point 6.3) must be made with
the fuse link resting on the fuse clips on the fuse base,
4. The distance between the striker pin and the fuse trip flag
(15) must be from 3-6 mm. By this adjustment the fuse link is
allowed to sag, but the distance between the striker pin and the
fuse trip flag must not exceed 12 mm,
5. If the fuse switch disconnector does not open when adjusted
as mentioned above, the adjustment has to be checked and
repeated.
Remark:
– the hooks (12) on the release rod (1) ought to have the same
position as shown on Fig. 29 - when the fuse switch disconnector
is in open position with both operating springs uncharged, but
with the releasing spring charged (ref. point 1).
Fig. 28
Fig. 30
Fig. 29
Fig. 31

12 NAL/NALF – Mounting and operation manual
7.0 Mounting of earth switch type E (Fig. 32) and earth
switch type LCES (Fig. 33)
The switch will normally be delivered for connection of the hand
operating mechanism on the right hand side and any mechanical
interlook on the left side. The splined extension intended for con-
nection to the hand operating mechanism will have free travel.
The extension for the interlook will be bolted to the shaft,
see Fig. 32.
7.1. Mounting the earth switch to the switch-disconnector
type NAL
The contacts A are mounted on the terminals of the switch
disconnector, and the surfaces of the main contacts are then
covered by contact grease. (Recommended grease: ISOFLEX
TOPAS NCA 52).
Close the earth switch slowly and adjust the fixed contacts to line
up correctly with moving contacts. Tighten the contacts screws.
7.2 Mounting the earth switch to the fuse-switch
disconnector type NALF
Proceed as under item 7.1. The contacts A must be mounted
on the terminals of the fuse base, and secured in position with
tension bushes.
8.0 Mounting the mechanical interlock between switch di-
sconnector and earth switch. Fig. 32-34
The switch disconnector must be in the open position (for NAL-A
the opening spring must be charged before assembly of the inter-
lock, see item 2.1.).
The earth switch must also be in the open position. Put one half
of the guide A (side plate) on the operating shafts of the switches.
Mount the interlock connection B. Mount the interlock rings C and
D on the shafts with the flat part of the ring facing towards the
interlock connection B, see Fig. 34.
Do not forget to mounting the two distance rings E on the two
screws F.
Fig. 32 Earthing switch type E mounted on the NAL switch disconnector | Fig. 33 Earthing switch type LCES | Fig. 34 Mechanical interlick for
earthing switch
Fig. 32
Fig. 34
Fig. 33

NAL/NALF – Mounting and operation manual 13
Testing the interlock
It shall not be possible to close the switch-disconnector when the
earth switch is closed.
It shall not be possible to close the earth switch-disconnector
when the switch is closed.
9.0 Mounting the shunt release. Fig. 38
Turn the operating shaft E, see Fig. 26 a maximum of 60°
clockwise. Opening spring housing F, see Fig. 31, must not be
Fig. 35 Auxiliary switch mounted on NAL 17-24 | Fig. 36 Wiring diagram auxiliary switch | Fig. 37 Wiring diagram tripping coil | Fig. 38 Shunt
trip parts component A-mechanism | Fig. 39 Auxiliary switch mounted on NAL 12
Fig. 35
Fig. 38Fig. 39
Fig. 36
Fig. 37
latched. Return the shaft to its neutral position. Connect the bar B
to the perforated disc A, see Fig. 31.
10.0 Mounting the auxiliary switch. Fig. 35 and 39
The auxiliary switch is mounted to the frame on the opening side
of the switch-disconnector and the bar connected to the crank on
the hollow shaft.

14 NAL/NALF – Mounting and operation manual
11.0 Mounting the auxiliary switch for E-EB earthing switch,
excluding LCES, Fig. 40-50.
1. The installation starts with the earthing switch in open position,
see Fig. 40.
2. The arm of auxiliary switch should be at an angle 45-50 degre-
es in direction of earthing switch, see Fig. 41.
3. Holdfast screw must be tightened from the flat side of auxiliary
switch shaft, see Fig. 42.
Fig. 40
Fig. 42
Fig. 41
Fig. 40-42 Mounting the auxiliary switch for E-EB earthing switch

NAL/NALF – Mounting and operation manual 15
4. The shackle (connecting part with a hole) is mounted on the
extension shaft of earthing switch so that the rod connecting
the arm of auxiliary switch with shackle is slightly strained,
see Fig. 43.
5-7. Tighten the screws (M5) that mount the shackle on
extension shaft of earthing switch, see Fig. 44-46.
Fig. 43
Fig. 45
Fig. 44
Fig. 46
Fig. 43-46 Mounting the auxiliary switch for E-EB earthing switch

16 NAL/NALF – Mounting and operation manual
8-9. Tighten the holdfast screw rather firmly, see Fig. 47-48.
Verify the correct operation of auxiliary switch.
10. Earthing switch in open position, see Fig. 49.
11. Earthing switch in closed position, see Fig. 50.
Fig. 47-50 Mounting the auxiliary switch for E-EB earthing switch
Fig. 47
Fig. 49
Fig. 48
Fig. 50

12.0 Mounting of NM motor drive
1. Check that the motor drive is working correctly according to
Fig. 51 and 52.
Motor drive settings for A-mechanism
2. NAL/F must be in open position and discharge both springs.
Locate the spacer bracket mounting holes on the A-mecha-
nism, see Fig. 53-54. Fully tighten mounting screws.
NAL/NALF – Mounting and operation manual 17
Fig. 51
Fig. 53
Fig. 52
Fig. 54
Fig. 51-54 Mounting of NM motor drive on A-mechanism

Fig. 7
3. To reduce side shake, turn the operating shaft anticlockwise,
see Fig. 55-56.
4. Before mounting on the A-mechanism shaft, set up distance
to ~4-8 mm, see Fig. 57.
18 NAL/NALF – Mounting and operation manual
Fig. 55-57 Mounting of NM motor drive on A-mechanism
Fig. 55
Fig. 56 Fig. 57

5. Mount the standard motor drive for NAL/F on the shaft and
fully tight mounting screws, see Fig. 58-59.
NAL/NALF – Mounting and operation manual 19
Fig. 58-59 Mounting of standard motor drive for NAL/F on A-mechanism
Fig. 58
Fig. 59

Motor drive settings for K-mechanism.
6. NAL/F must be in open position. Locate the spacer bracket
mounting holes on the K-mechanism, see Fig. 60-61.
Fully tighten mounting screws.
7. Before mounting on the K-mechanism shaft, set up distance
to ~4-8 mm, see Fig. 62.
20 NAL/NALF – Mounting and operation manual
8. Before mounting the motor device, adjust distance ~3-5 mm
in K-mechanism, see Fig. 63.
9. Mount the standard motor drive for NAL/F on the shaft and
fully tight mounting screws, see Fig. 64-65.
Fig. 60-65 Mounting of standard motor drive for NAL/F on K-mechanism
Fig. 60
Fig. 62
Fig. 64
Fig. 61
Fig. 63
Fig. 65