SGC DF-2 User manual

MEDIUM VOLTAGE SWITCHGEAR
THE MODULAR CONCEPT
Extract installation manual:
Gland plates and cable connections
THE SPECIALIST IN MEDIUM VOLTAGE SWITCHGEAR
SGC nv - SwitchGear Company - Moorstraat 24 - B-9850 Nevele BELGIUM
Tel: [phone] - Fax: [phone] - e-mail: [e-mail] - www.switchgearcompany.be
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© 2020 SwitchGear Company nv.
All rights reserved.
The information provided may not be reproduced and/or published in any way and by any means (electronic or
mechanical), without the prior, explicit written authorisation of SwitchGear Company nv
The information provided is based on general data concerning the construction known at the time of publication, material
qualities and working methods, so that the right to make changes is reserved.
The information given is applicable to the standard version of the DF-2 Medium Voltage Switchgear. Therefore
SwitchGear Company nv. cannot be held liable for any damage resulting from specifications that differ from the standard
version of the DF-2 Medium Voltage Switchgear.
The available information has been assembled with the greatest possible care but SwitchGear Company nv. cannot be
held liable for any mistakes in the information or the consequences thereof.
The user names, trade names, trademarks, etc, used by SwitchGear Company nv. in accordance with the legislation
concerning the protection of trademarks cannot be considered to be free.

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CONTENTS
Contents...................................................................................................... 1-2
Preface ........................................................................................................ 1-3
This document ........................................................................................................................ 1-3
Pictograms and safety symbols in and on the medium voltage switchgear ............................ 1-3
Pictograms in the documentation ........................................................................................... 1-3
Related documentation ........................................................................................................... 1-4
1 Assembly of the floor pans – cable connection ................................ 1-5
1.1 Assembly instructions for connecting single phase cables ................................... 1-6
1.1.1 Preparations ......................................................................................................... 1-6
1.1.2 DF-A / DF-P .......................................................................................................... 1-6
1.1.3 DF-D and DF-D/EDN ............................................................................................ 1-9
1.2 Assembly instructions for connecting parallel cables ......................................... 1-10
1.2.1 Preparations ....................................................................................................... 1-10
1.2.2 DF-D and DF-D/EDN type 800A/1250A ............................................................. 1-10

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PREFACE
This document
This document is intended as a reference for qualified and trained operators to transport,
install, use and maintain the medium voltage switchgear in a safe and economic way.
In this document the definition “medium voltage switchgear” is used to indicate a random –
but in actual practice existing – combination of DF-2 cubicles that, connected, form a
customer-specific transformation or distribution switchgear. For details, see “General
description”.
The chapters and sections are numbered. The page numbering (Form of the chapter
number and the page number) and the document code can be found at the bottom of each
page.
In the documentation the words “left”, “right”, “front” and “behind” are used to indicate a
specific part of the medium voltage switchgear. The starting point is always the position of
the operator, standing in front side of the switchgear.
Pictograms and safety symbols in and on the medium voltage
switchgear
Depending on the version, the following pictogram is used on the medium voltage
switchgear:
WARNING
High Voltage Danger
Access to the particular cubicle is only allowed after the cubicle itself, the next
and the previous cubicle are voltage-free.
Pictograms in the documentation
In the user’s manual of the medium voltage switchgear, the following pictograms are used:
CAUTION
Procedures that can – when not carried out with the necessary care - result in
damage to the medium voltage switchgear, the surrounding area or the
environment.
WARNING
High Voltage Danger

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CAUTION
Clamping danger
Notes, suggestions and advices
Make the cubicle in question, the next one and the previous cubicle voltage-free,
before carrying out the work described.
Open the load break switch as well as the earthing switch before carrying out the
work described.
Consult the indicated information sources first.
Protect the medium voltage switchgear from water or damp.
Related documentation
The following technical documentation is available for the medium voltage switchgear:
− Spare-parts list (AG608301)
− Technical Brochure (AG601301)
− Transport Manual
− Maintenance Manual

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1 ASSEMBLY OF THE FLOOR PANS – CABLE CONNECTION
Considering the fact that when installing the cubicles, the assembly of the floor pans and
the connection of the cables happens almost simultaneously, the descriptions of these
actions are combined.
The following applies in all circumstances:
A standard connection is possible up to 400 mm² for a single core cable per
phase.
Upon request, single core cables up to 630 mm² or 2 parallel cables up to
630mm² per phase can be connected to the DF-2 switchgear.
Connection of the cables is restricted to trained, qualified and authorised
personnel in accordance with the guideline mentioned in the installation manual
and using exclusively the materials supplied by SGC nv.
The floor pans and cable grommets should be installed in accordance with the
below mentioned guidelines and in accordance with the state of art closing off all
openings, prior to placing the switchgear into service.
The cable clamps should be installed in accordance with the below mentioned
guidelines and in accordance with the state of art to fulfil its function as strain
relief, prior to placing the switchgear into service.
Trifurcation of 3-core cable should be done outside the switchgear and cables
must never cross inside the cubicle. For the connection of the cables, a torque
of 60Nm needs to be respected at all times.

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1.1 Assembly instructions for connecting single phase cables
1.1.1 Preparations
Ensure that the switchgear in question is entirely voltage-free and earthed.
1.1.2 DF-A / DF-P
• Mount the first floor pan at the rear of the switchgear (Figure 1A) on both sides to the
frame, using the flange bolt (Figure 1B), the serrated spring washer (Figure 1C), and
the bolt (Figure 1D).
• Disassemble the cable bracket (Figure 2 B).
Figure 1
Figure 2

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• Make a circular incisions in the grommet in
accordance with the cable section to be connected
(Figure 3A). Slide the grommet over the cable at
the right height.
• Install the cable over the M12 bolt against the
connection terminal. Place the washer (Figure 3B),
disc spring (Figure 3C) and nut (Figure 3D).
Figure 3
• Connect the earthing cable (Figure 4B) to the
earthing strip (Figure 4D) using the bolt (Figure
4C).
Figure 4
• Assemble the cable clamp (Figure 5A) on the cable support and fix it into place using
hexagonal tap bolts (Figure 5C), the spring washers (Figure 5B) and the nut (Figure
5D).
• Place the second bottom plate (Figure 6A) in the cubicle to cause the grommet to be
fixed into place by both bottom plates.
• Secure the bottom plate on both sides to the frame using a flange bolt (Figure 6B), a
serrated spring washer (Figure 6C) and a nut (Figure 6D).
Figure 5
Figure 6

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• Connect the cable securely with a torque of 60Nm and pay special attention to:
 Connection between cable lug and contact
 Strain relief of the (capacitive) isolator
 Accurate cable clamping using cable clamps
• Fix the cable clamps using a torque of 25 Nm.
• Continue according to these instructions, working towards the door opening in a
systematic sequence.
•
Since the assembly of the cables and bottom plates occurs in an analogous fashion for
DF-P cubicles, no further details are provided here. By request, a more exhaustive
description can be obtained.

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Figure 7
Figure 8 Figure 9
Figure 10
Figure 11
1.1.3 DF-D and DF-D/EDN
The circuit breaker can be withdrawn to allow an easy and comfortable cable assembly.
• Disassemble the first three floor pans, leaving the last
one assembled (Figure 7A)
• Make a circular incisions in the grommet in
accordance with the cable section to be connected
(Figure 8A)
• Slide the grommet over the cable (Figure 8A)
• Mount the cable over the M12 bolt, onto the
contact terminal. Place the washer (Figure 8B),
the disc spring (Figure 8C) and the nut (Figure
8D)
• Move the grommet (Figure 9A) to the correct
height
• Connect the earthing cable (Figure 9B) onto
the earthing strip (Figure 9D) by means of the
nut (Figure 9C).
• Place the second bottom plate (Figure 10A) inside
the cubicle, in order for the grommet to be fixed into
place between the two bottom plates.
• Secure the bottom plates on both sides to the frame
using a flange bolt (Figure 10B), a serrated spring
washer (Figure 10C) and a nut (Figure 10D).
• Mount the cable clamps (Figure 11A) onto the bottom
plate and secure them using hexagonal tap bolts (Figure
11C), spring washers (Figure 11B) and flange nut (Figure
11D).
• Fasten the cable securely with a torque of 60 Nm. Pay
special attention to:
 Connection between cable lug and contact
 Strain relief of the (capacitive) isolator
 Accurate cable clamping using cable clamps
• Secure the cable brackets with a torque of 25 Nm.
• Continue according to these instructions, working towards
the door opening in a systematic sequence.
• The circuit breaker can now be placed back into the
cubicle, the flexible coppers can be connected to the
busbar copper, with a torque of 35 Nm.

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Figure 12
Figure 13 Figure 14
1.2 Assembly instructions for connecting parallel cables
Since the assembly of the bottom plates and the connection of the cables usually occurs
hand in hand, the instructions are described here simultaneously.
These instruction allow for an assembly of 2 parallel cables with a section of 400 mm² per
cable per phase. By request, provisions for a connection with 2 parallel cables with a
section of up to 630 mm² are possible.
1.2.1 Preparations
Ensure that the switchgear in question is entirely voltage-free and earthed.
1.2.2 DF-D and DF-D/EDN type 800A/1250A
The circuit breaker can be withdrawn to allow for an easy and comfortable cable assembly.
• Disassemble the first three floor pans, leaving the last
one assembled (Figure 12A).
• Make a circular incisions in the grommet in
accordance with the cable section to be connected
(Figure 13A).
• Slide the grommet over the cable plug (Figure 14A).
• Mount the cable over the M12 bolt, onto the
contact terminal. Place the washer (Figure
13B), the disc spring (Figure 13C) and the
nut (Figure 13D).
• Repeat these steps for the connection of
the second cable on the contact
• Slide the grommet (Figure 14A) over the
cables at the correct height.
• Connect the earthing cable (Figure 14B) onto the earthing strip (Figure 14D) by means
of the nut (Figure 14C).

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Figure 15
Figure 16
• Place the second bottom plate (Figure 15A) inside the
cubicle, in order for the grommet to be fixed into place
between the two bottom plates.
• Secure the bottom plate on both sides to the frame
using a flange bolt (Figure 15B), a serrated spring
washer (Figure 15C) and a bolt (Figure 15D).
• Mount the cable clamps (Figure 16A) onto the bottom
plate and secure them using hexagonal tap bolts
(Figure 16B), spring washers (Figure 16C) and flange
bolt (Figure 16D).
• Fasten the cable securely with a torque of 60 Nm. Pay
special attention to:
 Connection between cable lug and contact
 Strain relief of the (capacitive) isolator
 Accurate cable clamping using cable clamps
• Secure the cable clamps with a torque of 25 Nm.
• Continue according to these instructions, working
towards the door opening in a systematic sequence.
• The circuit breaker can now be placed back into the cubicle, the flexible tresses can be
connected to the earthing copper, with a torque of 35Nm.
After connecting the all floor pans, grommets and connecting the cables, the door can be
placed back onto the cubicle.

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THE SPECIALIST IN MEDIUM VOLTAGE SWITCHGEAR
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