SGVA
Impulse Voltage Test System, 200 – 10’000 kV / 10 – 1’500 kJ










Shunt reactors
Power transformers
Instrument transformers
Cables (type tests)
Arresters (impulse current tests)
Insulators
Bushings
GIS and air-insulated breakers

in the factory or on-site. For the latter tests, the SGVA system
can be mounted in modules on a trailer or installed in an airconditioned weather-resistant tower for permanent outdoor
operation.
Our generator withstands earthquakes and strong winds due
to its extreme engineering design and are also protectedagainst fire & lightning.
Impulse test system with 4000 kV impulse generator& divider and 3600 kV multiple chopping gap

APPLICATIONS
Series impulse generators are designed to address all the
rigorous requirements of industry and research. The field of
applications extends form the industrial test facility touniversity laboratories and to large-scale research centres forultra high voltages.
SGVA impulse test systems can be used to generate impulse
voltages simulating lightning strokes and switching surges.
The total charging voltage ranges from 200 kV to 10’000 kV
with a per stage energy of 10 to 30 kJ. This wide range
permits optimum capacity selection for any test assignment.
The system is built on all our experience acquired in Impulse
Generators since 1932.
Applications covered include testing to IEC, ANSI/IEEE as wellas other national standards.
The basic system can be upgraded in various ways for special
tests or greater ease of operation. A number of optional
additional circuits and components can be included to
optimise the impulse test system for tests on:

Outdoor test system 6 MVa brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 1/11

USER BENEFITSMain features of the SGV system are:Quality
The electronic measurement and control components aredesigned and manufactured in-house. Our many years ofexperience in dealing with electromagnetic compatibility ofelectronic devices in high voltage test bays provides therequisite expertise.



In designing and manufacturing our impulse test systems wetake full advantage of our seventy years of experience. As aresult, trouble-free operation and a long service life are
ensured.
Safety of Operation
The design of the test system and, in particular, the control
system comply with VDE 0104. Testing personnel benefit
from enhanced protection against accidents. The grounding
device with two grounding bands and two grounding
switches guarantees safe operation. The controls provide
clear alarm messages and guide the user through theoperations.





















Motorised safety earthing systemEase of Operation with Modern Control System
The generator controls are very comfortable and flexible,
safety features are implemented in the hardware too
independent of software. All components of the control
system are EMC tested.

Sophisticated, strong and flexible design (experience has
proven that our 30 stage generator (6 MV) can withstandstrong earthquakes several times).
Total charging voltage from 200 kV up to 10’000 kV.
Energy for stage ranges from 10 kJ to 30 kJ.
Reliable and accurate triggering by improved Marx circuit.
Easy operation with micro-processor based control
system.
Equipped with resistors for lightning and switching
impulse voltages. Special resistors can be manufactured
for testing any load or impulse shape.
Unique protective grounding device, the fastest available
on the market.
Ingenious extensions of load range (Glaninger Circuit,
Overshoot Compensation, Special Resistor sets fortransformer, cable or GIS testing).
Short reconfiguration times (internal ladder, internal
platforms, handy plug-in resistors and connections,special resistor support and resistor compartments on
every stage).
Series resistors can be interchanged with one another as
can be the parallel resistors. Different values of a resistor
type can be used.
Encapsulated spark gaps with filtered air-flow.
Different kind of base frames available.
Liquid insulation in the impulse capacitors is made of
castoroil
whichoffersoptimalenvironmental
compatibility (no PCB’s).
Communication between measuring system and controls
allows the determination of the efficiency and to workwith test voltages instead of charging voltages
Top electrodes adjustable according to customers’
impulse test requirements.
Special solutions for unique customer problems or test
requirements.

Controls GC 257 Imp.
6 MV, 450 kJ impulse test systema brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 2/11

Protection of Test Objects and Test Systems
The test system is shut down in case of over-voltage, overcurrent or fast voltage transients.
The test system is continuously monitored during test
operation.
Extension
The Haefely Test impulse generator SGV is a modular
system. The impulse generator can be extended for thegeneration of higher peak values (by adding of some stages)
or for the generation of other wave shapes (by adding
resistors and or other external circuits). Also the load range
can be extended by adding the Glaninger circuit or theOvershoot Compensation device.
Appearance
High voltage test bays form an important part of any
manufacturing system that maintains the quality of acustomers’ products.
A well-equipped test bay with appropriate appearance isimportant. Haefely products are not only technically, but also
aesthetically designed to complement the quality image ofthe customer’s facilities.
Function of the Impulse Test System

Accessories for additional measurements, tests or analysesof the wave shape are:
 Shunts
 Chopping Gap
 Measuring System Additional circuits for transformer testing or impulse
current generation
The block diagram below demonstrates the basic functions of
the system. The impulse test system operates under a control
system which charges the impulse generator through the
charging unit. This is achieved as the stages in the impulse
generator are connected in parallel via the charging resistors.
Charging time and charging voltage can be selected by theoperator.
Once the selected charging voltage has been reached, atrigger pulse initiates firing of the first spark-gap of theimpulse generator. The resulting over-voltage triggers the
successive stages. As all the spark-gaps fire, the stages which
are in series now, multiply the charging voltage to reach thetest voltage.
An impulse voltage divider reduces the impulse voltage to avalue that the measuring and recording instruments can use.

The test system comprises the following main components:
 Impulse Generator
 Charging Rectifier Impulse Voltage Divider
 Control System

IMPULSE TEST SYSTEM LINE DIAGRAM

Test Object

Charging Rectifier

V

Standard Impulse Test System

Shunt

Divider

Impulse Generator

A

Chopping orSphere Gap

Installation,
Testing andTraining

mm

Control Unit

Impulse Measuring
SystemAccessories

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 3/11

OPERATING RANGE
The minimum output voltage is 20 kV positive and negative.
This is obtained with only one stage operating. The otherstages are shorted or connected in parallel. The maximum
output voltage is between 85% and 95% of the total charging
voltage, depending on the load and the waveform. Details
about the load range and output voltages are given in ouroffers/quotes.

Im p u lse V o lta g e G e n e rato r(th e sim p le s t e q u iv a len t s in g le s ta g e c irc u it)
RS

CS

RP

CL

Ambient conditions
 The impulse generator can be operated at ambient
temperatures between -5 °C and 45 °C and relative
humidity (R:H.) up to max. 95 % (no condensed moisture).
 The control and measurement equipment is deigned for
operation at ambient temperatures of 0 °C to 45 °C and
R.H. values between 35 % and 80 %.
 The permissible temperature and R.H. ranges for shippingand storage of all parts are –20 °C to 60 °C and max. 95 %R.H. (no condensed moisture).
The voltage values stated in the documentation are forstandard conditions, that is, T = 20 °C, b = 1013 mbar and f =80%.
Theses values also apply for operation of the system up to
1000 m above sea level. Above this elevation, the rated
charging voltage is to be reduced by 1% for each additional
100 m.
Impulse intervals
At maximum charging voltage, minimum time between
impulses is 30 s (2 impulses per minute) for the smaller
generators up to 2 MV. This interval is dictated by the
maximum charging current, the maximum energy of theimpulse capacitors in the impulse generator and energy
absorption capacity of the resistors.
Immunity to Electromagnetic InterferenceElectromagnetic interference is unavoidable in impulse
testing. The SGVA test system is designed especially forminimising the influence of interference fields to ensure
correct functioning of the controls and measuring
instruments.
The measurement and control lines are properly shielded andgrounded. All inputs and outputs are protected against overvoltages. All system components are grounded with asuitable material such as copper braid or copper foil to keep
the ground potentials at a safe level. The measurement signal
from the high voltage divider is in the range of 100 V to 1’600
V in order to ensure a high signal to noise ratio.
The Impulse Voltage Generator
The Impulse Voltage Generator is the main part of an impulse
voltage test system. An impulse voltage generator SGV
consists of a number of capacitors charged in parallel up to a
maximum voltage of 200 kV for L.I.. When the desired
charging voltage has been reached, a set of sphere gaps
connect the capacitors in series and the output voltage isdelivered via some pulse forming elements.
The figure shows an equivalent circuit diagram for a single
stage impulse generator (it is possible to simplify a multistage impulse generator into this circuit).

DESIGN
Like all Haefely Test impulse generators the SGV generator isbased on the MARX multiplier circuit. The construction of
SGV generators is the result of decades of experience indesigning impulse test systems. The major impulse circuit
elements such as capacitors and resistors are arranged in an
optimum manner to simultaneously satisfy the two major
requirements viz. smallest possible internal inductance andoperating convenience. The design is strong enough towithstand earthquakes. In order to increase the impulse
capacitance, generator stages can be connected in parallel
and the groups so formed can be further connected in series.
The total charging voltage being the product of the stage
charging voltage and the number of groups.
The impulse generator can be extended easily for thegeneration of higher peak values by adding some stages.
Impulse generators are designed for stationary operation as
standard. For handy mobility, an air bearing system isavailable as an optional accessory.
Spark-gap drive, gap chimney ventilation, safety groundsystem, triggering unit and charging rectifier are built into thebase frame.
Triggering
High reliability and accuracy of generator triggering,extremely high stage energies and long front times (forswitching impulse voltages) is ensured by using tail and front
resistors and additional firing capacitors in the lower stages.
The reciprocal irradiation of the spark gap with the ultraviolet
light of the discharge spark is an additional reliability factor.
The generator is triggered by a triggering impulse which actson the triggering electrode in the lowest spark gap via acoupling capacitor. All subsequent stages are then reliably
triggered with extremely small delays due to the high natural
over-voltages, without the need for a complex electronic
triggering system in each individual stage. The encapsulationof the spark gaps and the filtered air flow eliminates theinfluence of dust and random particles.

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 4/11

Resistor wiring concept
All resistors are distributed among the stages within thegenerator as external resistors aren’t used for the V typegenerator anymore. This concept guarantees minimum spacerequirements and low inductance of impulse circuit.

Internal ladder
An internal ladder made of insulating material makes it
possible to reach the operating platforms. For normal
operating duty, there’s no additional external ladder or cranenecessary.

Front and tail resistors are wound with different innerinductances and therefore are not interchangeable.
Depending on front times, high or low-resistance front
resistors can be plugged in. The tail resistors for lightningand switching impulses generally remain in position. To
switch over from the lightning to the switching impulse
mode, it is only necessary to remove the short-circuitaluminium bar parallel to the switching resistors and to selecta front resistor in accordance with the load capacitance.

Operating platforms
At every third stage a folding platform is mounted. All
operations like resistor change, parallel connection of stages,
implementation of Glaninger circuit or OvershootCompensation can be performed from this platform (not only
from the internal ladder).

The charging resistors have been selected to provide a
sufficient efficiency factor, the necessary time to half value
and reasonable charging times even for extremely longswitching impulse voltages.
Trigger range
The trigger range starts at the lower triggering threshold andends at the static firing voltage of the switching spark gap.
The trigger range is expressed as a percent of the static firing
voltage. The larger this value, the more reliable is generator
triggering. The figure at right shows the trigger range plottedagainst the charging voltage.
The large trigger range of typically 25% and more is obtained
irrespective of the energy of the generator and practicallyindependently of the resistor configuration. In similar impulse
generators without firing capacitors, the trigger range may
drop to values below 10% and reliable triggering will nolonger be guaranteed.

Trigger Range %

50
40
30
20
10
0
0

25

50

70

100

150 200

Stage Charging Voltage kV
Support frame
Epoxy resin tubes glued to a welded steel frame andinternally tightened are the main part of the support frame.
This frame carries sets of two impulse capacitors in a Vshaped configuration as well as the resistor holders and aninternal ladder made of insulating material. Fibreglass guys
increase stability in generators with more than 22 stages.
The design is so good that even om 30 stage generators havewithstood earthquakes several times over.

Internal view of ladder and platform

Encapsulated spark gaps
The spark gaps of the generator type SGV consists of copper
spheres with 250 mm diameter. Tungsten sintered metal
inserts reduce burn-off. Precision translatory gears are used
to adjust gap distance. The drive motor is automaticallycontrolled from the control unit. The optimum spark gap
distance pre-selected for a given trigger voltage is
automatically adjusted.
A protective fibre-glass reinforced plastic cylinder encloses all
spark gaps, keeping dust and random particles away from thespheres. Thus impeccable triggering is guaranteed even in a
dusty environment. The lateral service openings are covered
with transparent Plexiglas lids. The protective cylinder is
supplied with filtered air by a powerful fan. The air blows
from the bottom to the top through the spark gaps with asmall overpressure. This de-ionises the air between thespheres from one triggering cycle to the next even in fast
impulse sequences. Premature firing is therefore practically
excluded. The protective epoxy resin cylinder also
substantially silences the noise produced during spark
discharge.
Impulse capacitors
Each impulse capacitor consists of flat elements built into asteel housing and impregnated with castor oil. The housing
walls are flexible so that the impregnating oil can expand.
Two 100 kV impulse capacitors are positioned in a Varrangement in each stage.
Years of experience with castor oil guarantee long capacitor
life. Castor oil offers optimal environmental compatibility (noPCB’s).

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 5/11

Firing capacitors
Generators with more than 6 stages are equipped with firing
capacitors in the lower stages for best triggering. They arebuilt as oil-impregnated paper capacitors cast in a plastic
cylinder. These capacitors remain in position in all circuit
configurations and for all front resistor values.
Resistors
All wave shaping resistors are built into the impulse
generator. They are wire-wound resistors of high stability andlinearity built in flat epoxy resin-cast resistors for highimpulse loads. Each resistor value has a specific colour foreasy identification. These resistors have a plug- in connection
for quick and easy reconfiguration. The basic system includes
a set of resistors for lightning and switching impulse voltages
according to IEC 60060-1.
Resistor support
Each stage is equipped with resistor holders with corrosionresistant spring contacts. These holders can support 8 series
resistors (also called damping or front resistors) and 4
parallel resistors (also called tail resistors). For the front
resistors there are two groups of holders which areconnected in series. Each can accommodate up to 4 plug- in
elements. Tail resistors holders are also parted in two groupsof up to 2 plug- in elements. This large number of supports
and their special arrangement allows the implementation of alarge number of resistor combinations to further increase
thermal loading capability and to adjust optimally the wave
shape. Every resistor holder is designed for the rated data. So
it is possible to use one resistor in one group and to shortcircuit the series connected other group.
Resistor compartment
Each stage has place for the storage of 8 standard plug inresistor elements (also for short circuit bars or othercomponents with standard length).
This resistor compartment allows to reach very short rewiring
times, because it is not necessary to move resistors between
the stages.
The compartment is easily accessible from the service
platforms.

Grounding system
Two earthing switches ground the generator at the first stage.
Due to the discharging time constant of the generator an
additional high speed earthing band is moved into all stages(for a 15 stage generator in approx. 30 s) and this grounds all
capacitors.

OPTIONS
Overshoot Compensation
An overshoot compensation circuit can be used to test very
high capacitive loads according to the standard impulse
shapes.
The Haefely developed and patented compensation circuit isdesigned as an add-on circuit which can be integrated in eachstage of the impulse voltage generator type V.

For testing low voltage windings of transformers, anadditional circuit is available as an option. This external
circuit permits the testing of very low inductive loads.
The Glaninger circuit presupposes the existence of the tailresistor set SGV RP.
This circuit is built into the first (respectively ground) and/or
second stage of the generator. The stages are connected inparallel (1s2p) or parallel/series (2s2p).

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 6/11

OPTIONS, CONTINUATION
Top electrodes
The use of top electrodes makes it possible to raise
preliminary discharge voltage to very high values. Several
models of top electrodes, made of aluminium toroids ormade of discs (Polycon design) are available. They arechosen on a function of the lightning and switching ratings
and the available clearance to the walls and ceiling.
The normal generator models have a simple tubularelectrode at the top. In most cases this is suitable, particularly
if the laboratory building is largely dimensioned or if no very
high switching impulse voltages must be generated.
Basically preliminary discharge will occur at the top of theimpulse generator prior to a spark-over and can be observed
as a voltage drop on the measuring unit.
This effect is more significant for switching impulse voltages
than for lightning impulse voltages and becomes increasingly
less important for higher load capacitance.

Protective cylinder for outdoor operation
For outdoor operation, the standard indoor generator is
enclosed in an air-conditioned weather-resistant tower.
Modifications to generator aren’t necessary. Internal lighting
and fire protection system are provided. Our design is also
resistant to natural lightning!
Base frames
Different types of base frames are available, for instancemobile types with air cushions, with wheels or for rail-bounddisplacement. A common base frame for the generator andthe charging rectifier allows a displacement of the basic
system without any reconnections.
Stationary impulse generators are almost exclusively used
for test systems with standard test objects and test programs.

Example of a top electrode

Front resistors for transformer tests
Resistor sets are available according IEC 60076-3 andANSI/IEEE C57.12 for switching impulse for transformer
testing. This is recommended to obtain a sufficient operating
range for high parallel connections (i.e. secondary voltage
windings of transformers)
Tail resistors for testing of small inductances
In order to compensate for the shorter decay time with small
inductances, an additional set of tail resistors can besupplied. It consists of three resistors for each stage.
Termination resistors for power transformers
To obtain the specified time to half value the non-tested
windings may be grounded through termination resistors.
Values ranging from 20 to 400 are suitable in series orparallel circuits. Used in these applications are band typeresistors.
Spare parts
Recommended is a set of spares consisting of the following: One 100 kV impulse capacitor
 One plug-in resistor for each resistance value One charging and one potential resistor Two 250 mm diameter spark spheres

Outdoor impulse generator & multiple chopping gap
2400 kV

Today most high-voltage laboratories are designed formobile test systems. The main advantage lies in improved
utilisation of available space and in greater flexibility for
different types of test configurations. Whenever possible thefloor should therefore be designed for air cushiontransportation. The modern air cushion devices available
today permit effortless displacement of the generator to any
desired location. They are clearly superior to the conventional
castor type dollies, particularly when large and heavy
generators are involved (friction, drive power). In most cases,
a motor drive or a separate tractor can be eliminated with air
cushion bases. Two persons can conveniently move evenlarge generators by hand. Many years of operating
experience have been gained under various operating
conditions.
The most frequently used air cushion frame is type LLK which
also accommodates the charging unit.

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 7/11

ON-SITE & OLI AND OSI TESTING
The impulse voltage on-site test system type SGV is designed
for high output voltages. The test system can be stored on a
low bed trailer, see below drawing of such a realization.

The charging voltages of mobile on-site impulse voltage test
system is available up to 2400 kV, depending of the testingneeds. In general the size of the on-site test equipment is not
limited. The modular design allows an easy storage in a lowbed trailer. For assembling and disassembling a crane isrequired. Such systems are suitable for testing Power
Transformers or GIS of the voltage classes.

Impulse Current generation
Only additional resistors and wave shaping inductances arenecessary for generating impulse currents with an impulse
voltage generator. Exponential impulse currents acc. IEC
60099-4 can be generated on test objects having very highresidual voltages.

Control and measuring equipment are fitted into a ˝control
container˝ which is also mounted on the low bed trailer. This
control container is removable and can be placed according
the site conditions. Additional elements like divider, top
electrodes and inductances (for OLI, OSI generation) arestored in a standard container.
For testing GIS with oscillating lightning or switching
impulses, the oscillation frequency is determined byinductance of the generator and capacitance of the test
specimen. In addition to the voltage divider, a minimum
capacitive load of 2 nF is required for operation of the test
system acc. to the IEC 60517 standards.
The inductances are made of modules to suit the rated
voltage of the generator. Each module consists of a coilwound on an insulating tube. The voltage distribution iscapacitively graded. The inductances are arranged
horizontally between generator and divider.

Impulse current testing arrangement for MV arresters

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 8/11

SHUNTS
Haefely shunts can be used for the measurement of impulse
currents. They consist of a metal cylinder with coupling
flanges and coaxial measuring connector. Different models
are available depending on the application.
Charging Unit LGR 200
The charging rectifier type LGR 200 is used to charge theimpulse capacitors with stage voltages up to 200 kV such as
the type SGV. It is usually located on the base frame of theimpulse generator. Connection from the bushing to thegenerator is done with an aluminium tube. The main
components i.e. high voltage transformer, rectifier element
and measuring resistor are located in an oil filled tank.
Standard charging rectifier type LGR 200 has a rated voltage
of 200 kV and a current of 60 mA or 200 mA (type LGR 200-60
or LGR 200-200).
Main features of the LGR 200 are:
 Compact & rugged design.
 Short circuit protected.
 Automatic motor-driven polarity reversal.
 Powerful
 Accommodates the connection box,
demagnetisation resistors.

damping&

Charging rectifier 200 kV, 60 mA

Controls
Two systems differing in sophistication and technicalspecification are available.
a) Competitive and well established GC 223 andb) fully computerised GC 257 IMP, operating underWindows.
The control systems for the SGVA test a system allows theuser to create fully automatic test sequences. The
programming of the control system is user-friendly. A
manual mode is also available. Data communication between
other Haefely Test equipment (impulse measuring
equipment) is fully supported. A remote control from a hostcomputer is available. The control system can be designed asa desk top or in a mini-rack-with-table-version. Haefely
control systems run on a self developed PCI (special
computer based on the up-to-date P.C). No additional efforts
like optical link or IR communications are necessary.

Impulse Generator Control GC 223
Comfortable and flexible control of an impulse system Safety procedures implemented in hardware, independentof any software Manual and automatic mode available Stand alone desk top unit or 19“ rack insert available Dust and dirt protected RS 232 Interface optional
 Automatic correction for atmospheric conditions
 EMC shielded and proof tested
 Execution of automatic test sequences (optional)
 Remote control for all functions (optional)Advanced Impulse Generator Control GC 257 IMP
The basic functions are the same as in the GC 223, but the GC
257 Imp offers more operating and upgrade capabilities.
 Windows based operating software
 Sophisticated sequence programs developed together
with the industry
 User-friendly software equipped with a flat screen colour
monitor. The operator is prompted by the software.
 Easy and clear indications and graphical display of several
features, such as: -trip levels, -system status, -failure
conditions, -flashovers, etc.
 Free programming and storage of complex test cycles.
Any number of test cycles can be stored.
 Interfaces for remote control and for transfer of measureddata.
 Fully automatic operation mode for customised test
sequences with individual parameters
 Integrated measurement and control functions as
required.
 Digital measuring system (like HIAS 743 or DIAS 733) canbe easily integrated
Safety and Protection Functions
The control unit has a connection for a safety circuit and isequipped with a connection for warning lights. Actuation
complies with VDE 0104. The lockable emergency switch isbuilt into a separate box. The switch can be placed as needed
so that it can be operated quickly in case of emergency. All
safety functions are directly wired to the input circuit breaker
i.e. they do not pass through the microprocessor control
system.
Damped Capacitive Impulse Voltage Divider
Damped capacitive impulse voltage dividers are used tomeasure high voltage full and tail chopped lightning and fullswitching impulses. Provided with an adequate additional
secondary part it can also be used for alternating voltage
measurements.
Dividers type CR can be used simultaneously as load
capacitance for the impulse generator.
Oil-filled insulating cylinders accommodate oil paper
capacitor packs. Dividers of type CR have an inserted
damping resistance, but need an additional external damping
resistor above 1000 kV.
space.

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 9/11

Main features: Response of system meets requirements of IEC 60060-2(1994)
 Four arms mobile base frame Indoor and outdoor types available CR dividers higher than 3 MV are equipped with fibreglass
strutsDifferent top-electrodes are available i.e. for measurementsof higher voltages in limited space.

Installation and Testing on Site
The user is responsible for the preparation of the test stationand the power supply. The installation and the connections
for the voltage transformers must be prepared.
The warranty of an impulse test system requires that thesystem be installed and tested on site under the supervisionof Haefely Test specialists. They perform the fine tuning on
the control and measurement electronics. A system test isthen performed under no load conditions.
An acceptance test is performed in co-operation with theclient/customer. If possible, the customer furnishes a test
object. Haefely Test accepts no liability for the test object.
The standard acceptance test includes the following points:
 Tests of all functions
 Calibration of controls
 Impulse tests
Training of Operating Personnel
After acceptance testing, the client’s personnel assigned tooperate the impulse voltage test system will be trained.
Installation and operator training is conducted by Haefely
customer service personnel and will be adapted to suit theparticular test facility and test specimen. This is an important
contribution to reliable operation of the test system.
10 Years Maintenance Guarantee
Because of the high degree of vertical integration withrespect to high-voltage components and electronicequipment, Haefely is virtually independent of the productpolicies of suppliers. A large stock of replacement parts isheld for maintenance purposes. This makes it possible for
Haefely to ensure the maintenance for 10 years.
On-site Calibration Service
Simple and unified calibration methods which apply tocomplete measuring systems give high-voltage test
equipment manufacturers, users and customers theassurance of comparable quality requirements and tests
involving such equipment.
Haefely Test performs following services on-site or in ourworks:
 Calibration of divider
 Calibration of measuring device
 Calibration of entire system

2400 kV impulse voltage divider

Technical Services
A high level of customer service is essential in view of thecomplexity of high voltage test systems and the highreliability demanded by the customer.

Other Services
Haefely Test offers a maintenance agreement tailored to thecustomer’s special needs. In this way, the value of the test
system can be preserved over a long period of time.
Further services are offered for support in integration tasksor during operation.

The full warranty of the impulse voltage test system isconditional on the performance of the following Haefely
services: Expert installation and on-site testing of the system
 Training of the operating personnel
 Maintenance of the test system throughout its service life,
but for a period of at least 10 years
 Availability of spare partsa brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 10/11

Order text
Description

Code- Complete system, including:

SGVA ... kV, ... kJ- Impulse generator

SGV ... kV, ... kJ- Charging rectifier

LGR ... kV, ... mA- Control unit with set of control andmeasuring cables, 20 m

GC 223- Impulse voltage divider with 20 m
LEMO measuring cable

CR ... kV- Impulse current shunt with 20 m
LEMO measuring cable

SH ... Ohm- Two sets of operating instructions
and test reports
Options- Computerised control unit with set ofcontrol and measuring cables, 20 m
- Impulse current peak meter

GC 257 IMP- Impulse Analysing System

DIAS 733-1/2
channels- High Resolution Impulse Analysing
SystemHIAS 743-1/2/3/4
channels- Technical services

DEL- Other possibilities

please contact us

DMI 551 IMP

List of leaflets
Control type GC 257 IMP
Control type GC 223
Impulse Voltage divider type CR
Impulse Voltage test systems up to 800 kV, 40 kJ, type SGSA
Impulse Voltage test systems up to 2600 kV, 260 kJ, type SG
A Digital Measuring Instrument type DMI 551
Digital Impulse Analysing System type DIAS
High Resolution Digital Impulse Analysing System type HIAS

4800 kV impulse generator at CESI, Milano

www.haefely.com
Europe, Asia, South &Central America, Australia
Haefely Test AG
Birsstrasse 3004052 Basel
Switzerland
 + 41 61 373 4111
 + 41 61 373 4912
 sales@haefely.com

China (Sales & Service Office)Haefely Test AG – Beijing Office8-1-602, Fortune Street
No. 67, Chaoyang Road, Chaoyang District
Beijing, 100025
P. R. China
 + 86 10 8578 8099
 + 86 10 8578 9908
 sales@haefely.com.cn

North America
Hipotronics Inc.
1650 Route 22
PO Box 414
Brewster, NY 10509
USA + 1 845 279 3644
 + 1 845 279 2467
 sales@hipotronics.com

a brand ofHaefely is a subsidiaryof Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

LL_SGVA_1111_JW – 11/11