Megger SWG 1750 C User manual

Consultation with Megger
1
SWG 1750 C/CD
Surge Wave Generator
USER GUIDE
Issue: 03 (09/2015) - EN
Article number: 128314159

Consultation with Megger
2

Consultation with Megger
3
Consultation with Megger
The present system manual has been designed as an operating guide and for
reference. It is meant to answer your questions and solve your problems in as fast and
easy a way as possible. Please start with referring to this manual should any trouble
occur.
In doing so, make use of the table of contents and read the relevant paragraph with
great attention. Furthermore, check all terminals and connections of the instruments
involved.
Should any question remain unanswered or should you need the help of an authorized
service station, please contact:
Megger Limited Seba Dynatronic
Mess- und Ortungstechnik GmbH
Archcliffe Road
Kent CT17 9EN
T: [phone]
F: [phone]
E: [e-mail]
Dr.-Herbert-Iann-Str. 6
D - 96148 Baunach
T: [phone] – 0
F: [phone]
E: [e-mail]
Hagenuk KMT
Kabelmesstechnik GmbH
Megger USA
Röderaue 41
D - 01471 Radeburg / Dresden
T: [phone] – 0
F: [phone]
E: [e-mail]
Valley Forge Corporate Centre
2621 Van Buren Avenue
Norristown, PA 19403 USA
T: [phone]
F: [phone]
Megger
All rights reserved. No part of this handbook may be copied by photographic or other means unless Megger
have before-hand declared their consent in writing. The content of this handbook is subject to change without
notice. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook.
Megger also disclaims all responsibility for damage resulting directly or indirectly from the delivery, supply, or
use of this matter.

Terms of Warranty
4
Terms of Warranty
Megger accept responsibility for a claim under warranty brought forward by a customer
for a product sold by Megger under the terms stated below.
Megger warrant that at the time of delivery Megger products are free from manufacturing
or material defects which might considerably reduce their value or usability. This
warranty does not apply to faults in the software supplied. During the period of warranty,
Megger agree to repair faulty parts or replace them with new parts or parts as new (with
the same usability and life as new parts) according to their choice.
This warranty does not cover wear parts, lamps, fuses, batteries and accumulators.
Megger reject all further claims under warranty, in particular those from consequential
damage. Each component and product replaced in accordance with this warranty
becomes the property of Megger.
All warranty claims versus Megger are hereby limited to a period of 12 months from the
date of delivery. Each component supplied by Megger within the context of warranty will
also be covered by this warranty for the remaining period of time but for 90 days at
least.
Each measure to remedy a claim under warranty shall exclusively be carried out by
Megger or an authorized service station.
This warranty does not apply to any fault or damage caused by exposing a product to
conditions not in accordance with this specification, by storing, transporting, or using it
improperly, or having it serviced or installed by a workshop not authorized by Megger.
All responsibility is disclaimed for damage due to wear, will of God, or connection to
foreign components.
For damage resulting from a violation of their duty to repair or re-supply items, Megger
can be made liable only in case of severe negligence or intention. Any liability for slight
negligence is disclaimed.
Since some states do not allow the exclusion or limitation of an implied warranty or of
consequential damage, the limitations of liability described above perhaps may not
apply to you.

Contents
5
Contents
Consultation with Megger...............................................................................................3
Terms of Warranty ...........................................................................................................4
Contents ...........................................................................................................................5
1Safety Instructions ...........................................................................................6
1.1 General Notes ....................................................................................................6
1.2 General Safety Instructions and Warnings.........................................................7
2Technical Description ......................................................................................9
2.1 System Description ............................................................................................9
2.2 Technical Data .................................................................................................10
2.3 Controls ............................................................................................................11
2.4 Connection Components..................................................................................12
3Commissioning ..............................................................................................13
3.1 Electrical Connection........................................................................................13
3.2 Preselecting Surge Level .................................................................................15
3.3 Switching On ....................................................................................................16
4Operation ........................................................................................................17
4.1 Setting of the Surge Voltage ............................................................................17
4.2 Adjusting Surge Sequence...............................................................................19
4.3 Operating Modes..............................................................................................20
4.3.1 Pinpointing a Cable Fault (Continuous Surging) ..............................................20
4.3.2 Pre-locating a Cable Fault (Single Shot / Charging) ........................................21
5Concluding the Test.......................................................................................22
6Maintenance and Care ...................................................................................23

Safety Instructions
6
1Safety Instructions
1.1 General Notes
This manual contains basic instructions for the commissioning and operation of the
device / system. For this reason, it is important to ensure that the manual is always
available to the authorised and trained operator. He needs to read the manual
thoroughly. The manufacturer is not liable for damage to material or humans due to non-
observance of the instructions and safety advices provided by this manual.
Locally applying regulations have to be observed!
The following symbols may be present on the packaging material, on the instrument and
in the manual:
Symbol Description
WARNING
Indicates a potential danger of an electric shock that may result in fatal
or serious injury.
CAUTION
Caution (refer to accompanying manual for instructions)!
Indicates a potential danger that may lead to slight or moderate injury.
The notes contain important information and useful tips for using the
system. Failure to observe them can render the measurement results
useless.
It is important to observe the generally applicable electrical regulations of the country in
which the device will be installed and operated, as well as the current national accident
prevention regulations and internal company directives (work, operating and safety
regulations).
After working on the system, it must be voltage-free and secured against reconnection
as well as having been discharged, earthed and short-circuited.
Use genuine accessories to ensure system safety and reliable operation. The use of
other parts is not permitted and invalidates the warranty.
The system may only be installed and operated by an authorised electrician. DIN VDE
0104 (EN 50191), DIN VDE 0105 (EN 50110) and the German accident prevention
regulations (UVV) define an electrician as someone whose knowledge, experience and
familiarity with the applicable regulations enables him to recognise potential hazards.
Anyone else must be kept away!
Safety precautions
Labelling of safety
instructions
Working with products
from Megger
Operating staff

Safety Instructions
7
1.2 General Safety Instructions and Warnings
The operating safety is only guaranteed if the delivered system is used as intended (see
page 9). Incorrect use may result in danger to the operator, to the system and the
connected equipment.
The thresholds listed in the technical data may not be exceeded under any
circumstances.
The equipment may only be used when working properly. When irregularities or
malfunctions appear that cannot be solved consulting this manual, the equipment must
immediately be put out of operation and marked as not functional. In this case inform the
person in charge who should inform the Megger service to resolve the problem. The
instrument may only be operated when the malfunction is resolved.
Five safety rules
The five safety rules must always be followed when working with HV (High Voltage):
1. De-energise
2. Protect against re-energising
3. Confirm absence of voltage
4. Earth and short-circuit
5. Cover up or bar-off neighbouring energised parts
Using cardiac pacemaker
Physical processes during operation of high voltage may endanger persons
wearing a cardiac pacemaker when near these high voltage facilities.
Wear Ear Protection
Surge operation can cause high and sudden noise levels. It is strongly
recommended to wear hearing protection during surge operation. Keep in
mind that this will limit the operators awareness for ambient dangers.
Intended application
Behaviour at
malfunction of normal
operation

Safety Instructions
8
Fire fighting in electrical installations
•According to regulations, carbon dioxide (CO2) is required to be
used as extinguishing agent for fighting fire in electrical installations.
•Carbon dioxide is electrically non conductive and does not leave
residues. It is safe to be used in energized facilities as long as the
minimum distances are maintained. A CO2fire extinguisher must be
always available within electrical installations.
•If, contrary to the regulations, any other extinguishing agent is used
for fire fighting, this may lead to damage at the electrical installation.
Megger disclaims any liability for consequential damage.
Furthermore, when using a powder extinguisher near high-voltage
installations, there is a danger that the operator of the fire
extinguisher will get an electrical shock from a voltage arc-over (due
to the powder dust created).
•It is essential to observe the safety instruction on the extinguishing
agent.
•Applicable is DIN VDE 0132.
WARNING
Dangers when working with high voltage
Working on high voltage systems and equipment – especially in non-
stationary operation – requires particular care and safety-conscious action
on the part of test personnel. VDE regulations 0104 on setting up and
operating electrical test systems, as well as EN 50191 and national
standards and regulations must be strictly adhered to.
•The SWG 1750 C/CD generates a dangerous voltage of up to 32 kV.
•The test system may not be operated without supervision.
•Never fail to use safety equipment or put it out of operation.
•Operation requires minimum two people whereas the second person
must be able to activate the emergency switch in case of danger.
•To prevent dangerous charge accumulation, earth all metal parts in
the vicinity of the high voltage equipment.

Technical Description
9
2Technical Description
2.1 System Description
The SWG 1750 C/CD surge wave generator serves primarily for pinpoint location of
cable faults. For this purpose, the impulse capacitors are charged and then discharged
into the faulty cable which causes an arc at the weak point of the cable insulation (fault
position). The resulting flashover noise as well as the magnetic pulse propagate in the
ground and can be recorded, amplified and evaluated with a surge wave receiver (e.g.
digiPHONE+) on the surface. The distance to the fault can be calculated using either the
volume of the flashover noise or the time difference between the arrival of the magnetic
pulse and the flashover noise.
When combined with a reflectometer and an ARM filter in a test van environment, the
SWG 1750 C/CD can also be used for pre-location of cable faults by means of the arc
reflection measurement (ARM) and / or the current decoupling (ICE, Impulse Current
Equipment) method.
The scope of delivery of the system includes the following:
•Surge wave generator
•Auxialiary surge attachment (CD model only)
•HV connection cable, 4 m
•Mains connection lead, 2,5 m
•2 x earthing lead, 5 m
•Manual
If the following optional accessories are not contained in the scope of delivery, it can be
ordered from SebaKMT Sales:
Accessory Description Item number
Isolating Transformer GTV
2500VA
Protection against voltage spikes and
overvoltage which may occur in the
supply network
108300126
Intended use
Scope of delivery
Optional accessories

Technical Description
10
2.2 Technical Data
The surge wave generator has the following parameters:
Parameter Value
Surge voltage 0 … 8 kV / 16 kV / 32 kV
Output power
•C model
•CD model
1750 J
3500 J
Surge sequence Single shot or 2.5 s … 10 s
Maximum charging current
•at 0 … 8 kV
•at 0 … 16 kV
•at 0 … 32 kV
210 mA
105 mA
53 mA
Capacity
•at 0 … 8 kV
•at 0 … 16 kV
•at 0 … 32 kV
54.4 µF (C) or 109 µF (CD)
13.6 µF (C) or 27.2 µF (CD)
3.4 µF (C) or 6.8 µF (CD)
Power supply 230 VAC ±10%, 45 … 60 Hz (maximum surge
energy can be guaranteed only at 230 VAC)
Current consumption 6.5 A (average value)
Weight
•Basic unit 97 kg
•Auxialiary surge attachment
(CD version)
30 kg
Dimensions (W x D x H)
•Basic unit 520 x 430 x 630 mm
•Auxialiary surge attachment
(CD version)
520 x 270 x 410 mm
Operating temperature -20 °C … 40 °C
Storage temperature -40 °C … 70 °C
Relative humidity 93% at 30 °C
Protection class (according to
IEC 61140 (DIN VDE 0140-1))
I
Protection rating (according to
IEC 60529 (DIN VDE 0470-1))
IP20

Technical Description
11
2.3 Controls
The SWG 1750 C/CD has the following controls:
Element Description
Single shot push-button / over temperature indicator
“HV OFF” push-button
“HV ON” push-button
On/off push-button
Surge sequence rotary switch
Fuses
F1/F2: 10 A circuit breaker
F3: M 0,8/250 (control)
Surge voltage control knob (with zero contact)
Input voltage meter
Charging voltage meter
Surge level switch

Technical Description
12
2.4 Connection Components
The following connection components are located on the rear of the SWG 1750 C/CD:
Element Description
Socket for connection of auxialiary surge attachment (CD version only)
HV output
"HV interlock" key switch
Socket for connection of external emergency unit NAG 1
BNC socket for connection to a reflectometer (current coupler)
Socket for connection to an arc stabilisation unit (LSG)
Mains power socket
Protective earthing connection

Commissioning
13
3Commissioning
WARNING
General safety instructions for set-up and commissioning
•The safety guidelines for the operation of mobile testing systems often
differ from one network operator to another and are frequently subject
to national regulations (such as the German BGI 5191). Before the
measurement session, find out what the applicable guidelines are and
follow the rules set out therein precisely, in respect of the organisation
of work and the commissioning of the mobile test system.
•Select a location which is sufficient for the weight and size of the
system and ensures that it stands securely.
•When setting up or connecting the system, make sure that it does not
impair the functional capability of any other systems or components. If
other systems and components have to be modified, be sure to
reverse these measures once the work has been completed. Always
take the special requirements of these systems and components into
account and only carry out work on them after consulting and
obtaining approval from whoever is in charge of them.
•In the event of larger differences in temperature between the storage
and installation locations (cold to warm) condensation may form on
components carrying high voltage (condensation effect). To avoid any
risk of damage to people and devices caused by voltage arc-overs,
the device must not be operated when in this condition. It should
instead be left in the new environment for roughly one hour to
acclimatise before it is then put into operation.
3.1 Electrical Connection
WARNING
Safety instructions for the electrical connection
•The SWG 1750 C/CD may only be connected to de-energised
equipment. The general safety instructions and, in particular, the five
safety rules (see page 7) must always be followed prior to connection
to the test object.
•Follow the specified connection sequence.
•All cables which are out of operation and not needed for the test must
be shorted and earthed.
•Because the voltage applied to the device under test can exhibit
values that represent a shock hazard, the test station itself and the
ends of the cables must be shielded as per VDE 0104 to ensure that
such contact is not possible. When doing so, be sure to take all cable
branchings into account.

Commissioning
14
The procedure described below specifies how the SWG 1750 C/CD is to be
connected electrically when in stand-alone mode.
Devices, which are permanently installed into a test van, are connected to the
defective cable using the vehicle's connection equipment. The procedure to
be used here is available in the respective operating manual.
The following figure shows the simplified connection diagram of a SWG 1750 C/CD in
stand-alone mode:
Proceed as follows, to connect the SWG 1750 C/CD to the defective cable:
Step Action
To be performed for CD version only:
Connect the additional surge battery with the aid of the given connecting
cable (High-tension supply line and earth cable) to each of the sockets
( and ) on the rear of the SWG 1750 C/CD.
Using the green/yellow earth cable make a connection between the
protective earth connection of the device and a suitable point on the
protective earth system (station earth).
Make sure that the connecting points of the earth cable are not soiled and
that they provide good metallic contact.
Plug the connector for the HV connecting cable to the HV-output of the
device and tighten the locking screw fitted to the plug connector
(contact switch!).
Connection diagram
Procedure
Station earth or other well-made
foundation earth electrode
Set up potential equalisation,
if not already present (min. 16 mm2)
230 VAC,
45 … 60 Hz

Commissioning
15
Step Action
Connect the screen of the HV connection cable to the earthed screen of the
defective cable (operational earth).
The screen of the HV connection cable should be fastened as
close as possible to the position at which the screen of the cable
under test is led out of the termination.
Connect the core of the HV connection cable to the core of the defective
cable.
Connect the mains power cable included in the package to the system's
mains connection lead and a power supply socket.
If the package contents include an isolating transformer, then it is to be
connected between the mains power cable and the power supply socket as
protection against voltage peaks and overvoltage!
3.2 Preselecting Surge Level
Selection of the surge level can only be made as long as the device is switched off (the
green push-button and the red push-button are not lit). When the device is
switched on a blocking magnet prevents the switch from being operated.
The plug-in rotary switch can be used to choose between the following surge levels:
Position Surge level
I 0 … 8 kV
II 0 … 16 kV
III 0 … 32 kV
In order to be able to utilise the maximum possible output power
, in particular,
when in pinpointing mode (loud "bang" at fault location),
the smallest surge
level required for igniting the fault should be selected
. For example, at an
ignition voltage of 14 kV the 16 kV surge level should be selected.
To change the surge level, the switch has to be forcibly pulled upwards, turned to the
required position and then forcibly pushed down again.
CAUTION
Any attempt to operate the plug-
in rotary switch during operation will lead
to the device being shut down. The charge energy present in the pulse
capacitors and cable can however, destroy the switching contacts.

Commissioning
16
3.3 Switching On
In stand-alone mode the SWG 1750 C/CD can be switched on immediately after all
connecting lines have been fitted (the white ON-/OFF-button lights up).
To transfer a device permanently fitted into a test van into this state, the test van’s
system control panel has to be switched on first. Following this, a surge operating mode
has to be selected and HV has to be enabled on the system control panel.
Detailed instructions on the procedure are available in the operating manual of
the test van.
The SWG 1750 C/CD can be switched on by pressing the ON/OFF button . The
enabled operational readiness is then indicated by the “HV ON” button lighting up in
green. There is not yet any high voltage in this state because the HV output is still
earthed.
If the button should fail to light up, this is probably down to one of the following reasons:
•Plug connector of HV connection cable not properly fastened to HV output
or locking screw not tightened
•Plug connector or dummy plug not properly fastened to socket for connecting
the auxiliary surge attachment or the locking screw is not tightened (CD
version only)
•The plug-in rotary switch is not latched correctly into a position
•The control knob for adjusting the surge voltage is not set to the left limit
stop (0%)
Once operational readiness has been established, HV can be enabled by pressing the
illuminated green "HV ON" button .
The green button then goes out and the red "HV OFF" button lights up. The internal
earthing is lifted and high voltage may be present at the HV output!
WARNING
If the red button fails to light up even after pressing the green button and it
has gone out, one must then still assume that the switch-on standby has
been enabled and that high voltage is applied to the HV-output!
Requirements
Switching on
Enabling high voltage

Operation
17
4Operation
4.1 Setting of the Surge Voltage
In particular when pinpointing a cable fault it is vital that the maximum amount of surge
energy is utilised, because the discharge energy and the loudness of the "bang" impact
proportionally on the fault location.
The surge energy depends directly from the set surge voltage. The full surge energy is
only reached, when the maximum surge voltage of the selected surge level has set
(voltage regulator set to right limit stop (100%)).
At a lower surge voltage the remaining available energy is calculated using the following
formula:
W = 0.5 x C x U²
The following example can be derived based on the quadratic relationship between
voltage and capacity:
As the diagram clearly shows, the correct choice of surge level (see page 15) plays a
decisive role. This means that for a required surge voltage of 8 kV, the full energy of
1750 J is only reached in the 8 kV-surge level.
In the next higher surge level (16 kV) the available energy is then reduced to 435 J
(roughly 25%). In the 32 kV surge level only 110 J (roughly 6%) would be available at a
surge voltage of 8 kV.
Basic principles
Example
Energy
Voltage
8 kV
16 kV 32 kV
1750 J
435 J
110 J

Operation
18
Before setting the surge voltage, the control knob for setting the surge sequence
has to be turned to left limit stop (single shot). In this way, the required surge voltage
can be precisely set without surges being automatically released in between doing so.
To adjust the voltage, the voltage regulator has to be turned slowly in a clockwise
direction. The current capacitor charging voltage can be read off the analogue kV
meter .
With a view to the optimum energy efficiency (see previous page), setting the voltage
regulator to <50% is not very practical (except in the lowest surge level). Instead of this
the SWG 1750 C/CD should be switched off and a lower surge level should be selected
(see page 15).
CAUTION
•To avoid any damage to the cable, the set surge voltage must not
exceed the limits for the particular type of cable!
•If the SWG 1750 C/CD is to be operated with a supply voltage of up
to 10% above 230 VAC, the actual charging voltage must not exceed
the maximum value of the set surge level (e.g. 16 kV) (keep an eye
on the kV meter)! Otherwise damage may occur to the system's HV
components.
•Depending on the operating altitude, the following limits have to be
considered while setting the voltage:
Adjusting surge voltage

Operation
19
4.2 Adjusting Surge Sequence
The surge sequence can be adjusted using the control knob . Automatic surge
decoupling is switched off on the left limit stop on this control knob (single shot mode).
This setting is to be selected for the cable fault location in combination with a connected
reflectometer.
In order to activate an automatic surge decoupling for cable fault pinpointing, the control
knob must be rotated in a clockwise direction and then set to the required position.
The surge sequences will be as follows to match the control knob position:
Single shot
Each surge pulse must be activated by pressing a button.
Fastest surge sequence
The surge pulses occur at intervals of roughly 2.5
seconds.
Medium surge sequence
The surge pulses occur at intervals of roughly 5 seconds.
Slowest surge sequence
The surge pulses occur at intervals of roughly 10 seconds.

Operation
20
4.3 Operating Modes
4.3.1 Pinpointing a Cable Fault (Continuous Surging)
Once the required surge sequence and the surge voltage have been set (see previous
sections), the SWG 1750 C/CD immediately starts continuous decoupling of the surge
pulses in the defective cable.
The fault position can then be located with the aid of a suitable surge wave receiver
(such as, e.g. the digiPHONE+).
For more details about operating the surge wave receiver, please read the
accompanying instructions.
WARNING
Do not leave the system in operation unattended and accessible to the
third parties. Cordon off the location in a secure manner or instruct an
authorised person to monitor the system.
The device is automatically switched off if any overheating occurs in the high-voltage
transformers. This fault condition is indicated by the button lighting up yellow. After
a corresponding cooling-down period the device can be switched on again.
Procedure
Excess temperature