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$SSOLFDWLRQ SF6 insulated test transformers are especially designed for testing metal-clad switchgear (GIS) in the factory and on-site, and for testing on-site substation equipment. The conventional transformers can be flanged directly to the GIS. This makes testing of such GIS installations possible without feeding them through an air-SF6 bushing. Therefore, the merits of the encapsulation remains effective also during the testing which is of importance for Partial Discharge tests. These systems are particularly suited for on-site tests of GIS after assembly. In the factory, they allow to test sub-assemblies and components directly in the manufacturing line, thus avoiding transportation to a central test facility, and extra handling. 8VHUEHQHILWV • Small and compact dimensions resulting in minimum space requirements • Light-weight components • Rugged construction to withstand transportation stresses • Direct flanging to the test object • High safety for operating personnel because of encapsulation of all HV carrying parts • Large range of application in conjunction with test bushing for testing of „open“ equipment • Built-in HV measuring capacitor 4XDOLW\ Haefely quality assurance complies with ISO 9001. The electronic measurement and control devices are designed and manufactured in-house. Our many years of experience in dealing with EMC is therefore an important asset. The design of the test system complies with the VDE 0104 standard for optimal protection of the operating personnel. The test system is shut-down in case of over-voltage, over-current and fast voltage transients. Damage at the fault is minimised.

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6\VWHPFRPSRQHQWV The test system includes following main components: • Regulating transformer type STL (only with factory test system TSS) • Power line filter type NLFA • Compensating reactor type KDL (only with factory test system TSS) • Low voltage protection unit (included in systems rated 510 kV or higher) type NSP • Test transformer type TES • Control system type OT 247 for factory tests (TSS) or • Regulating cubicle with control panel, type TKMT, for on-site tests (TSSV) $YDLODEOH2SWLRQV• Encapsulated coupling capacitor type KKS • SF6-air bushing type DFS and various connection or adaptation flanges between test

transformer & bushing & coupling capacitor & test object. • Specific base frames or containers for on-site testing. • Encapsulated standard capacitor type NKS • Control system type OT 257 instead of the OT 247 • HV and grounding connections if bushing is used. The connection to test object is usually not

included. • Partial Discharge detectors • Capacitance and power loss factor measuring bridges • Other devices upon request.

4

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TSSV 750-25 TES 750-250 TKMT 250 )XQFWLRQRIWKHWHVWV\VWHP The encapsulated test transformer TES is a conventional transformer and steps-up the voltage coming from the regulating transformer. The controls act on the regulating transformer to adjust precisely the input voltage of the TES and thus the test voltage. A compensating reactor KDL is connected between the regulating and the test transformers and compensates the capacitive power required for the test object. This way, the STL and power line filter ratings can be kept small. For on-site tests, the controls (relay technique & push buttons) are integrated into the regulating transformer rack. The latter transformer is dimensioned to avoid a separate compensation reactor. This gives a most compact equipment with a minimum number of components to be transported and connected for testing. $PELHQWFRQGLWLRQVIRUDQHQFDSVXODWHG$&WHVWHTXLSPHQWHeight above sea level not limited for the HV parts Relative humidity in main hall under non condensing conditions not limited for the HV parts - Temperature averaged over 24 h for H.V. components min. 0 °C, max. + 30 °C - Extreme temperatures for H.V. components min. - 5 °C, max. + 40 °C - Temperature for electronic controls and measuring (equipment to operate with the specified measuring errors) min. + 15 °C, max. + 25 °C

5

'HVFULSWLRQRIWKHWHVWV\VWHPFRPSRQHQWV 5HJXODWLQJWUDQVIRUPHUW\SH67/ 'HVFULSWLRQ With this air-insulated column-type regulating transformer, the input voltage of the test transformer can be varied smoothly & continuously. The unit is for indoor operation. The active part is air insulated and built into a cubicle. The primary winding is galvanically separated from the secondary winding. The driving motor allows a slow and a fast regulating speed (40-240 s from 0-100 % of the voltage). The zero start interlock forces the operator to start always from zero. The primary breaker and secondary contactor are placed in the regulator cabinet. The power line filter can be built-in the regulating transformer cubicle.

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c pSTL 25 25 400 1.2 x 0.5 x 1.8 380

STL 50 50 400 1.6 x 0.6 x 2.0 570

STL 150 150 1000 1.0 x 1.8 x 1.5 1540

STL 200 200 1000 1.2 x 2.0 x 1.7 1700 3RZHUOLQHILOWHUVW\SH1/)$ 'HVFULSWLRQ For the reduction of line carried noise from the mains. The NLFA filters both phase and is connected to ground. Typical insertion loss per phase measured at 50 Ω / 50 Ω, MIL-STD 220 A > 80 dB in the following frequency range of 14 kHz...10 MHz

6

&RPSHQVDWLQJUHDFWRUW\SH.'/ 'HVFULSWLRQ For the compensation of the reactive power of capacitive test objects. The air-insulated compensating reactor is connected between the regulating transformer and the test transformer. Therefore, the power rating of the regulating transformer and of a possibly pre-connected power filter can be kept small. The compensating reactor comprises 3 inductances which can be combined to achieve up to 7 different power combinations. The re-connection is basically done manually. Upon request (option), a remote re-connection with switches, actuated from the controls, can be offered.

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KDL 180 180 400 1.1 x 1.2 x 1.0 550

KDL 360 360 400 1.2 x 1.2 x 1.0 850

KDL 900 900 1000 1.6 x 1.3 x 1.4 1800

KDL 1800 1800 1000 2.5 x 1.3 x 1.5 3200 /RZYROWDJHSURWHFWLRQGHYLFHW\SH163 'HVFULSWLRQ Is used to prevent inadmissible high recovery over-voltages on the test transformer in case of disruptive discharges on the test object. The low-voltage protection device NSP acts by opening the power supply and by short-circuiting of the test transformer primary winding within a few hundred microseconds. This avoids repetitive flashovers in the GIS.

Opening switch for disconnecting the

power supply

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primary winding

Regulating transformer

STL

Test transformer TES

7

7HVWWUDQVIRUPHUW\SH7(6 'HVFULSWLRQ The test transformer is the heart of any SF6 insulated test system. It is housed in a special tank and is terminated on its HV side by a GIS spacer. All LV terminals are brought out insulated and housed in a connection box. The exciter winding is divided into 2 groups to allow better flexibility in function of the test voltage & load and enhances the compensating reactor efficiency. The spacer type (standard ABB) is chosen acc. to the transformer voltage. Special design are available upon request. A high voltage capacitor is incorporated in the TES tank. The capacitor is used as the high voltage arm of a capacitive divider to perform voltage measurements according to IEC 60060-1.

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A secondary part for voltage measurement with a Haefely control unit or measuring instrument is fixed on the transformer housing. A platin-foil thermometer is built in the low voltage winding. The temperature is checked and switches the system off should it be over-loaded. 7HFKQLFDOGDWDRIWKH7(6WUDQVIRUPHUVHULHVDW+] a V#b#Y a8n

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TES 325-30 325 30 70 8 800 2000 140 17 2 x 400 5

TES 510-90 510 90 200 25 970 2300 210 17 2 x 400 5

TES 750-250 750 250 600 70 1260 3200 300 17 2 x 1000 10

TES 1000-375 1000 375 1000 105 950 2950 230 19 2 x 1000 10

Other voltage ratings are possible! Please contact us. The given power rating is valid at the output of the test transformer. If other components like a coupling capacitor, bushing or connecting flange are added, their internal capacitance reduce the available power available for the test object.

8

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TES 325-30 325 0.7 1.0 350

TES 510-90 510 1.0 1.1 1050

TES 750-250 750 1.4 1.8 2500

TES 1000-375 1000 1.5 2.6 4150 3'PHDVXUHPHQWV The indicated PD level is inherent to the test system itself, without considering possible external radiated interference or interference from the power supply. The PD level will be checked during the system test in our works. The above specified PD level presumes that the test system will be equipped with adequate filtering (low voltage filter) and earthing (< 2 Ω). The mains must fulfil the following requirements (according to IEC): Disturbances of supply voltage, peaks phase to ground max. 4 V Harmonics of supply: Ratio of peak to RMS value √2 ± 5 % 7\SLFDODFRXVWLFQRLVHOHYHO measured based on IEC 60551 < 75 dBA The actual noise level on site depends to a large extent on the on-site conditions, such as type of walls and the geometrical configuration. :RUNWHVWV- High voltage withstand test at 1.2 Un - PD measurement - Short circuit impedance measurement - Measurement of the voltage ratio 7UDQVSRUWDWLRQJDVFRQQHFWLRQUsually, the test transformers are shipped assembled and are therefore ready for immediate use. For transportation, the SF6 gas pressure should be reduced to 1.2 bar.

The standard filling valve is compatible with DILO treatment equipment. Other valves are available under request. The SF6 gas treatment equipment is not included in our scope of supply.

9

&RQWUROVW\SH27 'HVFULSWLRQ The Operating Terminal OT 247 provides a safe and easy computer-aided operation of transformer-type AC high voltage test systems. The unit is built into a standard 19" desktop housing. It has a high electro-magnetic compatibility and does not need additional screening. Due to the built-in safety interlocks the operator can fully concentrate on the test object. As an option, the more sophisticated OT 257 can be offered.

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6RIWZDUH The program allows the following operations: • Switching On/Off of the primary circuit breaker • Switching On/Off of the contactor (High Voltage On/Off) • Manual variation of the output high voltage, two speed levels • Automatic zero start-up after switching off the high voltage • Automatic setting of the output high voltage to a preset value with a pre-set speed (kV/s) • Timer for switching off the high voltage after a preset time At any time and in addition to the output high voltage a selection of four of the following information can be displayed: • Status of the protection system • Status of the safety circuit and the emergency trip • Output voltage and current of the regulating transformer • Timer +LJK9ROWDJHPHDVXUHPHQWThe measuring signal is derived from the built-in HV divider of the TES transformer. The value of the high voltage is permanently displayed, either as peak value/√2 or as RMS value. In case of flashover at the test object the control unit automatically stores the last voltage measurement as well as the polarity of the high voltage during the discharge. Measuring error of the electronic ± 0.5 % of the measured value between 10 % and 100 % of the system output voltage Measuring error of the complete measuring ± 1 % of the measured value between 10 % system (divider/coupling quadripole, and 100 % of the output voltage electronic system) at 50/60 Hz.

10

&RQWUROVIRURQVLWHWHVWVW\SH7.07 'HVFULSWLRQRIWKHFRQWUROV7.07 The controls TKMT house the control panel with push buttons, the HV-meter DMI 551 and the regulating transformer. Upon request, the power cables can be fitted with Multicontact plugs. 'HVFULSWLRQRIWKHFRQWUROVSDUW This push button controls allow the following functions and indications: • Emergency stop • Primary breaker On - Off • Secondary contactor On - Off • Horn • Setting of voltage variation speed • Max. current setting • Key-switch • Indication of test transformer temperature • Indication of Primary current and voltage • Indication of test transformer current on HV side.

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Warning lamps (one green, one red) are mounted on the TKMT cabinet. Plugs are provided for a safety circuit (Interlock). 'HVFULSWLRQRIWKHUHJXODWLQJWUDQVIRUPHUSDUWWith this air insulated regulating transformer the input voltage of the test transformer can be varied smoothly & continuously. The unit is for indoor operation, air-cooled. The primary winding is galvanically separated from the secondary winding. The zero start interlock forces the operator to start always from zero. 7HFKQLFDOGDWDRIWKH7.07FRQWUROVVHULHV a V#b#Y a x a o _!X Y#kwb]|Y?^~

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c pTKMT 30 30 400 1.3 x 0.8 x 2.2 270

TKMT 45 45 400 1.3 x 0.8 x 2.2 370

TKMT 90 90 400 1.3 x 0.8 x 2.2 570

TKMT 250 250 1000 1.3 x 0.8 x 2.2 680

11

'LJLWDOPHDVXULQJLQVWUXPHQWW\SH'0, 'HVFULSWLRQ Used in conjunction with the TKMT controls for on-site tests, the DMI 551 is a multi purpose measuring instrument for all kind of voltages present in high voltage test laboratories. The instrument has a high EMC compatibility and does not need additional screening. It is built into a 19" standard housing, 3 units in height.

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The DMI 551 has 3 separate analogue measuring channels and is available in all combinations. E.g. as a pure impulse measuring device up to a multi purpose AC, DC, IMP measuring device. Due to its modular system a later upgrade can be performed easily on-site without sending the device back to the Haefely works. +DUGDQG6RIWZDUHAre based on Haefely in house developments especially adapted to the demanding high voltage test environment. 3 individual measuring channels allow for better performance and higher reliability. Microprocessor control is based on PC 104 industrial standard and built with high quality industrial strength components. The illuminated LCD CFL screen has a size of 120 x 64 mm and offer a resolution of 240 x 128 dots. Software is stored on an EPROM and can be updated if required. 7HFKQLFDOGDWD Technical data are listed for a DMI equipped with only the AC measuring channel. $&9ROWDJH0HDVXULQJ&KDQQHO Measured values Peak / √2 (capacitor), RMS (fast A/D conversion) Display kV, 4 Digits Accuracy ± 0,5 %, ± 3 Counts Input voltage max 150 V RMS Measuring range 5...100 % Range setting automatic Input impedance 1 MΩ, 60 pF Frequency of the measured voltage 40...400 Hz, +/- 0.5 % Accuracy 16 2/3...40 Hz, +/- 1 % Accuracy Flash detection polarity and last Peak / √2

12

2SWLRQV(QFDSVXODWHG&RXSOLQJ&DSDFLWRU..6 'HVFULSWLRQ With an adapted coupling quadripole, the coupling capacitor is used for sensitive partial discharge measurements. Its capacitance is determined depending of the test object capacitance. The pre-tested active part is installed in an insulating tube, which is in turn installed in the coupling capacitor tube. This type of coupling capacitor has a high capacitance value, a good partial discharge behaviour and a high reliability. The capacitor vessel is equipped with a pressure gauge and filling valve.

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c pKKS 230-0.5 230 0.5 0.9 1.5 350

KKS 325-0.5 325 0.5 0.9 1.5 350

KKS 510-0.5 510 0.5 0.6 2.0 500

KKS 750-0.5 750 0.5 0.9 2.7 750 Other voltage ratings are possible. Please contact us.

13

6) × DLUEXVKLQJV')6DQGFRQQHFWLRQIODQJHV 'HVFULSWLRQ The SF6-air bushings are SF6 insulated, for outdoor use in any mounting position, with:

• Cylindrical FRP - insulator with silicone ribs

• Metal housing flange with gas fitting, spacer and lifting lugs.

An aluminium top electrode is mounted on the top bushing to allow PD free testing. A pressure indicator is available as an option.

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c pDFS 230 230 0.5 2.2 220

DFS 325 325 0.6 3.0 450

DFS 510 510 0.7 4.4 600

DFS 750 750 1.0 7.5 1660 &RQQHFWLRQIODQJHV 'HVFULSWLRQ A multitude of connection flanges can be realised to connect:

• coupling capacitors • SF6-air bushings • test object • test transformer

These flanges can be equipped with a switch for separating a coupling capacitor from the test transformer for example. This helps to increase the capacitive load range of the test system. Earthing or PD calibration studs can be integrated too.

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Special base frames for the test transformer, coupling capacitor, SF6-air bushing can be realised.

14

6SHFLDOVROXWLRQV Ä7HVWDFURVVRSHQVZLWFK³DQGWHVWVDW+] 7HVWDFURVVRSHQVZLWFKSome customers require special tests on the breakers or disconnecting switches. This is a „test across open switch“ on the open breaker. Each of its contacts is energised separately. One of the voltage is phase shifted by 180 degrees, which allows to reach test voltage levels higher than the single test transformer nominal rating. The manufacturer thus needs 2 test transformers in his works. 37WHVWVDW+] In order to keep the instruments transformers in the circuit, tests have to be carried-out with a higher frequency, for example 180 Hz. A frequency converter (FU) is required for this test. %ORFNGLDJUDPIRUWHVWÄDFURVVRSHQVZLWFK³

kV

Frequency ConverterFU

Regulating transformerSTL

Test transformer400 kV TES 1

Testtransformer 400 kVTES 2

Test object at works

CouplingCapacitorKKS

Dielectric & PD testsTests at 180 Hz„Test across open switch"

Partial dischargeDetectorTE 571

Control unitOT 247

7HVWÄDFURVVRSHQVZLWFK³ZLWKERWK7(6RXWSXWVSKDVHVKLIWHGE\GHJUHHV Output TES 1 Output TES 2

Effective test voltage across test object is the sum of the outputs of the TES 1 and the TES 2.

15

&RQWDLQHUV 'HVFULSWLRQ For storage and transportation of the AC test system test system including the high voltage transformer TES. If possible, the container is subdivided by a partition in a "control room" and a "storage room". If not enough space is available, a separate container serves as control room. The regulating transformer TKMT with controls is installed inside the control room. The feeding voltage is transferred via special cables to the HV transformer. A desk with drawers can also be installed in the control room, which is lighted. Provision for a safety circuit connection is given. The container is usually equipped with a power distribution panel, including protection system and main circuit breaker. An opening is provided for the power and control cables which can be closed with a hinged door. All pieces of equipment are earthed at a central point, accessible from the outside of the container. The test transformer, eventual bushing with HV electrode as well as base frames are arranged inside the storage room / container. These elements are secured by adapted fastenings during transportation. Haefely uses the following standard steel container which are specially customised for the test equipment arrangement. A special double component paint, standard light grey RAL 9002, is used and the centre of gravity is clearly indicated. They can be transported by ship, train and lorry. Dimensions Control room container

10 feet Storage container

20 feet

Length x Width x Height 3.0 x 2.5 x 2.6 m 6.1 x 2.5 x 2.6 m

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16

2VFLOODWLQJ6ZLWFKLQJ,PSXOVH 'HVFULSWLRQ This generator allows to test GIS with oscillating switching impulses (OSI). It is fully independent from the AC components of the whole test system. It generates an OSI impulse of a few kV which is amplified by the test transformer TES itself. The system charges a bank of impulse capacitors which are discharged through the TES windings. The DMI 551 Imp (with options DC and Imp), with a special software displays the charging and the OSI test voltages. The OSI measurement signal is taken from the secondary part on the TES transformer.

400 V

OSI generator Test transformer Test object ,QFOXGHVWKHIROORZLQJPDLQFRPSRQHQWV

• Impulse capacitors with connection circuit • DC Charging and measuring circuits • Polarity change circuit • Integrated command panel • Digital measuring instrument DMI 551 IMP

26,UDFN 7\SLFDORXWSXWYROWDJH Max. output OSI voltage with test transformer TES 600 kV approx. 900 kV Max. output OSI voltage with test transformer TES 750 kV approx. 1250 kV The value depends of the test object load.

17

7HFKQLFDOVHUYLFHV 'HVFULSWLRQ Haefely Test AG has a dedicated Technical Services dept. with an experienced team of engineers doing the internal tests as well as the commissioning on-site and final testing of the test installations. Our Technical Services dept. does also preventive maintenance, repairs and calibrations if required. This responsive team allows to minimise eventual down-times and assures the shortest possible reaction time should any question arise. The full coverage of the warranty is granted only if Haefely Test AG has carried out the Technical Services. The charges for the delegation of our personnel are based on the terms and conditions of the Swiss Association of Machinery Manufacturers. ,QVWDOODWLRQ Big installations require our experienced team of mechanical erectors for supervising the assembly the test systems. 6\VWHPDQG$FFHSWDQFH7HVWVRQ6LWH Once the system is erected, we delegate our engineers for doing the systems tests at the customers’. The system test shall proof that the system works according to the specification at customer’s site and gives a first training to the operating staff. These tests can also be done with a real test object. 7UDLQLQJRI2SHUDWLQJ3HUVRQQHO The training is carried out by the Haefely senior engineer immediately after the systems tests. Detailed explanations about the use of the system, controls and measuring instruments are given, in addition to the operating manuals. 3UHYHQWLYH0DLQWHQDQFH6HUYLFHYLVLWV Haefely Test AG can offer a regular service & maintenance visit on-site for checking the system condition & proposing necessary works. This is particularly appreciated for production line equipment. This visit can also be combined with the system re-calibration.

18

$FFHVVRULHV 0HDVXULQJRI3DUWLDO'LVFKDUJHV By adding a coupling quadripole (option), the encapsulated coupling capacitor type KKS can be used for measuring partial discharges. Various coupling quadripoles can be used. Digital or analogue PD detectors can then be used depending of the customer’s needs. Please consult the Tettex General Catalogue for more information.

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0HDVXULQJRIFDSDFLWDQFHDQGWDQG The encapsulated standard capacitors type NKS are used in conjunction with C and tan δ bridges for measuring capacitance and tan δ values. Digital or analogue bridges can then be used depending of the customer’s needs. For more details, see the Tettex General Catalogue.

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19

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- Complete basic system TSS ... kV, ... kVA TSSV ... kV, ... kVA

- SF6 - insulated HV transformer with a built-in HV measuring capacitor

TES ... kV, ... kVA TES ... kV, ... kVA

- Switching and regulating cubicle STL ... kVA TKMT ... kVA

- Compensating reactor KDL ... kVA incl. in TKMT

- Control unit with set of control and measuring cables, 20 m

OT 247 in desk top housing

incl. in TKMT

- Voltage measurement incl. in OT 247 DMI 551 incl. in TKMT

- Power line filter NLFA as option

- Low voltage protection device (only included for systems 510 kV and above)

NSP as option

- One set of operating instructions and test reports in English or German)

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- Computerised control unit with set of control and measuring cables, 20 m

OT 257 with desk and mini-rack

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- Encapsulated coupling capacitor KKS ... kV, ... nF KKS ... kV, ... nF

- SF6 - air bushing DFS ... kV DFS ... kV

- Connection flanges ZF... ZF...

- Container for storage, transportation & test room --- CONT AC

- OSI generation rack TES OSI ... kV TES OSI ... kV

- Technical services DEL DEL

- Partial Discharge detectors & - C & tan δ measuring bridges

several models available, please see the Tettex General Catalogue

several models available, please see the Tettex General Catalogue

- Other possibilities please contact us please contact us

20

/LVWRIOHDIOHWV Modular AC test systems up to 300 kV, 0.25 A E 151.30

AC voltage test systems up to 1800 kV, 40 A E 152.51

Instrumentation for Partial Discharge, C and tan δ, accuracy and resistance

Tettex General Catalogue

Haefely Test AG offers also a complete range of impulse test systems for both impulse voltage and impulse current applications.

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12.2003 Subject to technical modifications without notice.

Haefely Test AG Lehenmattstrasse 353 CH - 4052 Basel Switzerland Tel. +41 61 373 41 11 Fax. +41 61 373 49 12 e-mail sales@haefely.com www.haefely.com