operating instructions load-break switches with...

November 2010

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

OPERATING INSTRUCTIONS LOAD-BREAK SWITCHES WITH OR WITHOUT FUSE HOLDER TYPE LDTP WITH QUICK-

MAKE / QUICK-BREAK DRIVE MECHANISM

November 2010 I Load Break Disconnector Switches Page 1 of 7

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




Figure 1

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:

DETAIL "A"

DETAIL "B"

LIMITING

DEVICEMAIN

SHAFT

SHAFT

SUPPORT

PUSH RODARCING CHAMBER

INSULATOR

FRAME

MAIN

SHAFT

OPERATINGTAB LEVER

OPENING ORCLOSINGMECHANISM

FUSE

TRANSMISSION

OPERATOR

MECHANISM

OPERATING

ROD ARCHING

HOOK

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.




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.

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.

ADJUSTMENT ON THE DISC-TYPE OPERATING MECHANISM AND THE TRANSMISSION ROD SHOULD BE MADE IN ACCORDANCE WITH THE INSTRUCTIONS GIVEN IN THE DW-900 MANUAL

ACCIONAMIENTO DE APERTURA O CIERRE (SU POSICIÓN DEPENDE DEL MANDO)

INSTALL 12º FROM THE VERTICAL POSITION TOWARDS THE FRONT OF THE SUBSTATION

OPERATING LEVER

REFERENCE PLANE

80º

12º

Figure 2




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 - Partial (halfway) stroke 3 towards 4 (this opens the main blades).

B

Figure 3

“L” Bracket

DETAIL "C"

Detalle "B" 18°

72°

75º

B

12º

A

80º

DETAIL “B”




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.

b

To charge the quick-break mechanism

2

c

Open

4

a To charge the quick-make mechanism

2

3

Close

3

Close

1

Open

CE RRAR

A)

1

B )

CERRAR 3

C )

2

2 4

ABRIR

3

Figure 4




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.




Power OPERATING VOLTAJE IN kV

COMMENTS SERIE 07 SERIE 15 SERIE 20 SERIE 30

kVA 2.4 4.16 4.8 7.2 13.2 13.8 15 17.5 23 25.8 34.5 36

15 10 4 4 4 2 2 1 1 1 1 1 1 FUSE WITHOUT

30 16 10 10 6 4 4 2 2 2 2 1 1 STRIKER PIN

45 25 16 10 10 4 4 4 4 4 2 2 2 1 AND 2 Amp

75 40 25 25 16 6 6 6 6 4 4 4 4

112.5 63 32 32 25 10 10 10 10 6 6 4 4

150 75 40 40 25 16 16 16 10 10 6 6 6 STANDARD

225 125 63 63 40 25 25 25 16 16 10 10 10 FUSE WITH

300 160 100 75 50 32 25 25 25 16 16 10 10 STRIKER PIN

400 200 125 100 75 40 40 32 32 25 25 16 16 (FROM 2 A.)

500 250 160 125 100 50 40 40 32 25 25 16 16

750 400 200 200 125 75 63 63 50 40 40 25 25 ONE FUSE

1000 500 315 250 160 100 100 100 75 50 50 40 32 PER-PHASE

1250 630 400 315 200 125 125 100 100 63 63 50 40

1500 500 400 250 160 125 125 100 75 75 50 50

2000 630 500 400 200 160 160 160 100 100 75 75

2500 630 400 250 200 200 200 125 125 100 100

3000 500 315 315 250 200 160 160 100 100

3750 630 400 315 315 250 200 200 125 125 TWO FUSE

5000 400 400 315 250 200 200 PER-PHASE

7500 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:

kV

kVAXI n 155.1

e) Choose the next highest current rating from the table below:

1 2 4 6 10 16 25 32 40 50 63 75 100 125 160 200 250 315 400 500

Serie 30, 30.....38 kV

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 [email protected] [email protected]

TELS: 53-00-8219 with 5 lines 53-00-0210 53-01-3620

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