DRIESCHER Y WITTJOHANN, S.A.
HIGH VOLTAGE SWITCHES
OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER
TYPE LDTP WITH QUICK-MAKE / QUICK-BREAK DRIVE MECHANISM
November 2010
OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
Index
1
Warning
2
2
Introduction
2
3
Upon Verification
2
4
To Operate the Equipment
4
5
Device Settings
6
6
Preventive Maintenance
6
7
Corrective Maintenance
6
8
Fuse Replacement
6
November 2010
I Load Break Disconnector Switches
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
1.- Warning
Read these instructions and get acquainted with the recommendations given herein. DO NOT operate the switch
until you have finished reading this. High voltage equipment must be operated by trained authorized personnel
only.
Remove the plastic straps from the quick-break mechanism BEFORE operating the switch
2.- Introduction
DRIWISA™ three-pole load-break disconnecting switches are used to open medium voltage circuits up
to 38 KV, connecting or disconnecting lines or cables, ring-circuits, as well as to connect or disconnect
transformers under load conditions.
Load-break switches type LDTP have the following parts:
ARCING CHAMBER
DETAIL "A"
PUSH ROD
OPERATING
ROD
INSULATOR
ARCHING
HOOK
FRAME
MAIN
SHAFT
LIMITING
DEVICE
MAIN
SHAFT
OPERATING
TAB LEVER
DETAIL "B"
OPENING OR
CLOSING
MECHANISM
SHAFT
SUPPORT
OPERATOR
MECHANISM
TRANSMISSION
FUSE
Figure 1
3.- Upon Verification
DRIWISA® load-break switches are design to section voltage networks to 38 kV; connect and disconnect lines
or cables, as well as connect and disconnect transformers.
1. DO NOT operate the switch without having applied paraffin wax as a lubricant over the contact areas. Never
use organic grease or any other type of electrical or industrial lubricant.
2. Make several charge-close-open cycles by means of the disc operator mechanism before installing (see note
under figure 4 of page 2).
3. When doing so, check that the shaft turn limiting device located at the end of the shaft reaches its final stop
when the switch is either in open or in closed position.
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
4. Be sure the arcing hooks have completely entered and engaged into the arcing chambers, pushed forward
by means of a stick or your hand (for details, see point 5 in PREVENTATIVE MAINTENANCE).
5. To facilitate any necessary adjustments to the transmission (i.e. making it longer or shorter), we suggest
installing the DW-900 OPERATOR MECHANISM. Operate it according to the DW-900 OPERATOR
MECHANISM MANUAL.
6. Verify that the bus bars or cables connected to the switch terminals do not exert undue stress upon them,
since such stress may affect the alignment of the chamber and cause incorrect operation.
7. In any operator option (right / left) the operating tab lever has to be 12º from the vertical position when the
switch is in open position (Fig. 2-A). This allows 80º rotation for opening and closing (Fig. 2-B).
Note: Make sure to tighten the operating tab lever screws to 35 lb-ft, and the ¼’ Allen screws to 15 Lb-ft.
8. In the 38 kV Load Break Switch, you must install the shaft support as reinforcement (fig. 3 detail "C") in order
to prevent future operation problems with the quick-make drive mechanism.
12º
80º
REFERENCE
PLANE
OPERATING
LEVER
INSTALL 12º FROM
THE VERTICAL
POSITION
TOWARDS THE
FRONT OF THE
SUBSTATION
ADJUSTMENT ON THE DISCTYPE OPERATING MECHANISM
AND THE TRANSMISSION ROD
SHOULD BE MADE IN
ACCORDANCE WITH THE
INSTRUCTIONS GIVEN IN THE
DW-900 MANUAL
Figure 2
ACCIONAMIENTO DE
APERTURA O
CIERRE (SU
POSICIÓN DEPENDE
DEL MANDO)
NOTE:
WHEN OPERATING THE SWITCH, ALWAYS DO SO WITH A STRONG AND DECIDED STROKE. NEVER HESITATE AS LEAVING
THE SWITCH IN HALFWAY POSITION (BETWEEN OPEN AND CLOSE POSITION) WILL DAMAGE THE EQUIPMENT.
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
DETAIL “B”
Detalle "B"
12º
A
18°
B
80º
75º
72°
DETAIL "C"
B
“L”
Bracket
Figure 3
4.- To Operate the Equipment
1. When operating a switch in an energized switchgear installation, it is recommended that you always use
insulated gloves, boots and mats. We recommend the use of a stage or insulation platform to prevent
electrical hazards.
2. Before operating the switch, stand firmly on the floor or on an insulating mat. Insert the operating rod into the
disc hole and hold it by the knob.
3. To know how to operate the equipment please check figure 4:
Siempre realice las operaciones con un movimiento franco y decidido.
NUNCA INTERRUMPA UN MOVIMIENTO YA INICIADO.
CARGAR - Complete stroke from 1 to 2 ( this fully charges the opening spring).
CERRAR - Complete stroke from position 2 to 3 (this returns main blades to original position).
ABRIR November 2010
Partial (halfway) stroke 3 towards 4 (this opens the main blades).
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
a
To charge the
quick-make
mechanism
b
c
To charge the
quick-break
mechanism
Open
2
2
4
1
3
3
Open
Close
Close
ABRIR
2
4
2
3
3
1
CERRAR
A)
B)
CERRAR
C)
Figure 4
NOTA: The quick-make drive mechanism has been designed to operate O N L Y in vertical
position. If the switch is operated in any other position (different from vertical) it won’t
work. If you try to operate the switch several times in this manner, you will cause a lot of
damage.
DRIWISA™ will not accept any claims if the shaft support is not installed in the 38 kV switches. Do
not hesitate to contact us as soon as possible with any doubt and/or question regarding these operating
instructions. This also applies if you need more detailed information. Our contact details are at the end of
the limited warranty page.
In case that the “L” bracket is NOT mounted (in 38 kV), the problems that arise will NOT be responsible for
DRIESCHER Y WITTJOHANN, S.A.
November 2010
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
5.- Device Settings
1. Minor adjustments to its operation in conjunction with the operating mechanism (disc type or other)
should always be made to the transmission rod.
2. Refer to the instruction manual of the operating mechanism, if necessary (DW-900 manual). (As long
as the operating disc mechanism is acquired from DRIWISA™).
3. For more details, consult the cabinet or switchgear manufacturer.
6.- Preventive Maintenance (At least once a year or every 30 operations):
1. Be sure the switch is NOT ENERGIZED.
2. Follow the basic safety rules and use the required safety devices (insulated mat, gloves, boots,
grounding devices).
3. Open the switch. Clean the dirty contact surfaces and apply only DRIWISA ™ paraffin wax as a lubricant
over the contact areas.
NEVER use organic grease or any other type of electrical or industrial lubricant on the contact areas.
4. DO use industrial lubricant to oil the moving parts of the operating mechanism (bearings, turning points,
joints, etc.).
5. Open the switch. Make sure that the arcing hooks are aligned with the holes at the front of the arcing
chambers, so that they can freely enter these chambers. You do this by pushing the hooks towards the
chambers with a stick (you can move with your hands if and only if the substation is NOT energized),
you can verify that they are lined up to enter the chambers, if it seems like the hooks will not enter, you
need to realign them with the holes.
6. Make several charge-close-open cycles with the disc operator mechanism. When doing so, check that
the shaft turn limiting device (Fig.1 detail “A”) located at the end of the shaft reaches its final stop when
the switch is either in open or closed positions.
7.- Corrective Maintenance:
In case of trouble, malfunctioning and / or need of spare parts, do not try to repair it by yourself, contact
your nearest DRIWISA Distributor / Representative or the switchgear manufacturer.
8.- Fuse Replacement:
A) To replace the transformer fuse first verify the calculation of the nominal current according to the
connected load, by doing the following :
a) Determine the system voltage in kV.
b) Determine the transformer power in kVA.
c) Find the rated current of the fuse (In) on the table below, in the intersection of the voltage
column and the transformer power row.
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OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
OPERATING VOLTAJE IN kV
Power
SERIE 07
kVA
15
30
45
75
112.5
150
225
300
400
500
750
1000
1250
1500
2000
2500
3000
3750
5000
2.4
10
16
25
40
63
75
125
160
200
250
400
500
630
4.16
4
10
16
25
32
40
63
100
125
160
200
315
400
500
630
4.8
4
10
10
25
32
40
63
75
100
125
200
250
315
400
500
630
SERIE 15
7.2
4
6
10
16
25
25
40
50
75
100
125
160
200
250
400
400
500
630
13.2
2
4
4
6
10
16
25
32
40
50
75
100
125
160
200
250
315
400
13.8
2
4
4
6
10
16
25
25
40
40
63
100
125
125
160
200
315
315
15
1
2
4
6
10
16
25
25
32
40
63
100
100
125
160
200
250
315
400
SERIE 20
17.5
1
2
4
6
10
10
16
25
32
32
50
75
100
100
160
200
200
250
400
23
1
2
4
4
6
10
16
16
25
25
40
50
63
75
100
125
160
200
315
25.8
1
2
2
4
6
6
10
16
25
25
40
50
63
75
100
125
160
200
250
SERIE 30
34.5
1
1
2
4
4
6
10
10
16
16
25
40
50
50
75
100
100
125
200
36
1
1
2
4
4
6
10
10
16
16
25
32
40
50
75
100
100
125
200
7500
COMMENTS
FUSE WITHOUT
STRIKER PIN
1 AND 2 Amp
STANDARD
FUSE WITH
STRIKER PIN
(FROM 2 A.)
ONE FUSE
PER-PHASE
TWO FUSE
PER-PHASE
CIRCUITE-BREAKER
10000
REQUIRED
RATED FUSE CURRENT (In) IN AMPERES
d) For cases not considered in the table, calculate the fuse rated current using the equation
below:
I n  1.155X
kVA
kV
e) Choose the next highest current rating from the table below:
1 2 4 6 10 16 25 32 40 50 63 75
Serie 30, 30.....38 kV
100
125
160
200
250
315
400
500
Serie 20, 20.....25.8 k V
Serie 15, 12.....17.5 k V
Serie 07, 2.4...7.2 kV
f)
For the replacement of fuses for other applications, ask to DRIWISA.
DRIESCHER Y WITTJOHANN, S.A.
San Luis Tlatilco No. 29
Parque Industrial Naucalpan,
C.P. 53470, Edo. de México
México
www.driwisa.com
nacionales@driwisa.com
soportec@driwisa.com
November 2010
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TELS: 53-00-8219
53-00-0210
53-01-3620
with 5 lines
OPERATING INSTRUCTIONS
LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICKMAKE / QUICK-BREAK DRIVE MECHANISM
November 2010
I Load Break Disconnector Switches
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