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Megger 651403, Инструкция по эксплуатации

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AVTM6514J Rev. A (03/2003) 

1 

SECTION 1 

Introduction 

RECEIVING INSTRUCTIONS 

Check the equipment received against the packing list to ensure that all materials are 

present. Notify Megger of any shortage. Telephone (610) 676-8500. 
Examine the instrument for possible damage received in transit. If any damage is 

discovered, file a claim with the carrier at once and notify Megger or its nearest 
authorized sales representative, giving a detailed description of the damage. 
This instrument has been thoroughly tested and inspected to meet rigid specifications 
before being shipped. It is ready for use when set up as indicated in this manual. 

GENERAL INFORMATION 

This instruction manual describes the operation and maintenance of Impulse 

Generators having Catalog No. 651403 and 651404. Catalog No. 651403 is the 120 V, 
50/60 Hz, 300 VA model, and Catalog No. 651404 is the 240 V, 50/60 Hz, 300 VA 

model. 
The Impulse Generator produces periodic pulses up to 15 kV for locating faults in 

cables by the high-voltage, impulse-tracing method. No larger than a medium-sized 
suitcase and weighing only 41 pounds, the Impulse Generator is contained in a 

fiberglass carrying case that is rugged and durable to withstand transportation from site 
to site. See Figure 1. 
The Impulse Generator uses low-voltage storage capacitors on the primary side of a 
pulse transformer. Every six seconds, a solid-state switch discharges the capacitors into 

the pulse transformer, which steps the voltage up to the required level. The resultant 
output is a high-voltage impulse with a steep front and an exponentially decaying "tail" 

— an ideal waveform for cable fault location. The waveform travels along the cable 
until it reaches the fault, where a sparkover occurs. High-voltage sparkover causes a 

significant current to flow, and the fault is located by detecting this current or the noise 
made by the sparkover. 
An ammeter on the Impulse Generator displays peak fault current in percentage of the 
available output. When the meter indicates a cable fault, its location is pinpointed by 

tracing the fault current with a detector carried along the cable path. Two such detectors 
are available from Megger: 

Содержание 651403

Страница 1: ...gh Voltage Equipment Read the entire manual before operating Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente PO Box 9007 Valley Forge PA 19485 1007 U S A 610 676 8500...

Страница 2: ...his manual is believed to be adequate for the intended use of the product If the product or its individual instruments are used for purposes other than those specified herein confirmation of their val...

Страница 3: ...ptions 11 Controls And Connectors 13 SECTION 5 15 Setup 15 SECTION 6 19 Operation 19 Operating Procedure 19 Interpreting The Output Current Meter 19 Shutdown Procedure 20 SECTION 7 21 Operation Notes...

Страница 4: ...AVTM6514J Rev A 03 2003 ii WARRANTY 33 APPENDIX 35 Brief Operating Instructions 35 FIGURE LIST Figure 1 Impulse Generator 2 Figure 2 Schematic Diagram 12 Figure 3 Typical Fault Diagram 21...

Страница 5: ...y the high voltage impulse tracing method No larger than a medium sized suitcase and weighing only 41 pounds the Impulse Generator is contained in a fiberglass carrying case that is rugged and durable...

Страница 6: ...AVTM6514J Rev A 03 2003 2 Figure 1 Impulse Generator...

Страница 7: ...d and buried cable A rotary switch allows the selection of 3 6 9 12 or 15 kV The switch also has a ZERO START position which discharges the capacitors and provides a zero voltage start up for safety I...

Страница 8: ...AVTM6514J Rev A 03 2003 4...

Страница 9: ...uipment can be extremely dangerous The purpose of the test equipment is limited to use as described in this manual Do not use the equipment or its accessories with any device other than specifically d...

Страница 10: ...ng voltage 120 V ac for Catalog No 651403 and 240 V ac for Catalog No 651404 Before making connection to the power source determine that the system is suitable for the voltage of the power source and...

Страница 11: ...truction of the equipment or apparatus under test Megger has made formal safety reviews of the initial design and any subsequent changes This procedure is followed for all new Megger products and cove...

Страница 12: ...AVTM6514J Rev A 03 2003 8...

Страница 13: ...voltage 3 to 15 kV switch selected Surge output current Approximately 600 A into a short circuit Output cable length 20 ft 6 m PHYSICAL Weight 41 lb 18 6 kg Dimensions 14 5 x 17 5 x 8 5 in D x W x H 3...

Страница 14: ...AVTM6514J Rev A 03 2003 10...

Страница 15: ...lid state switch SCR This switch Q7 is used to discharge the capacitor bank C7 3 Discharge circuit The energy in the capacitor bank is discharged into pulse transformer T3 through a damping resistor R...

Страница 16: ...Figure 2 Schematic Diagram...

Страница 17: ...pressor CR15 are provided across the main line voltage input Pilot light DS1 across a third secondary tap of T1 indicates that high voltage output pulses are available CONTROLS AND CONNECTORS AC INPUT...

Страница 18: ...AVTM6514J Rev A 03 2003 14...

Страница 19: ...n that meets the following conditions a Both the high voltage conductor and shield of the cable to be tested must be accessible b An electrical service suitable for the system must be available within...

Страница 20: ...generator voltage to ensure proper input voltage for the system 10 Operation from a portable engine generator The system can be operated from a portable engine generator when a service line is not av...

Страница 21: ...Rev A 03 2003 17 F WARNING Do not refuel the engine generator while it is running When these setup procedures have been completed the test may be conducted in accordance with the procedures given in...

Страница 22: ...AVTM6514J Rev A 03 2003 18...

Страница 23: ...he cable has a short circuit No deflection means the cable can withstand 3 kV 5 If no sparkover occurs at 3 kV set the OUTPUT KILOVOLTS switch to the next step 6 kV and repeat If the cable withstands...

Страница 24: ...rules of thumb ambiguities will occur from time to time and experience with the instrument will aid interpretation Increasing the output voltage to the next tap will usually resolve most questions SHU...

Страница 25: ...exposed faults can usually be located by the sound of the arc discharge or by the flash itself For more difficult cases where the cable is buried or the sheath is intact an electromagnetic impulse de...

Страница 26: ...t breakdown level For some installations the available 15 kV impulse may be excessive When such a limit exists the operator is cautioned not to exceed the specified voltage limit OPERATION WITH AN ELE...

Страница 27: ...The OUTPUT KILOVOLTS switch must remain set to ZERO START for at least 15 minutes before access is gained to the interior of the chassis F WARNING When it is necessary to touch the terminals of any o...

Страница 28: ...7 Apply a safety ground jumper across the terminals of the impulse capacitor 8 Check that all screws and nuts are tight 9 Examine all electrical connections for evidence of corrosion fracture or burn...

Страница 29: ...every six seconds at each output position 3 kV 20 6 kV 40 9 kV 60 percentages are approximate 12 kV 80 15 kV 100 6 Return the OUTPUT KILOVOLTS switch to ZERO START and set the ON OFF switch to OFF TRO...

Страница 30: ...ad 4 Isolate the fault to a major region of the circuit using the fan POWER lamp and OUTPUT CURRENT meter Once this is done systematically check test points in that region to determine the problem are...

Страница 31: ...ing Firing and Output Circuit Test Points 1 Check connections to meter M1 and check the meter movement 2 Check test points TP1 and TP2 for 28 V dc unregulated and 15 V dc regulated to ground respectiv...

Страница 32: ...very six seconds Return the OUTPUT KILOVOLTS switch to ZERO START A failure at this point is probably due to SCR Q7 resistor R19 or transformer T3 check for shorts and open circuits The problem might...

Страница 33: ...r PART NO Case Modified 15083 Bracket 15080 B1 Fan 9741 Hanger 15084 Cord 9741 4 L1 Choke Assembly 15092 K1 Relay 3623 DS1 Light 15099 Bulb 3612 3 CR15 Varistor 3384 1 CB1 Circuit Breaker 6807 7 M1 Me...

Страница 34: ...AVTM6514J Rev A 03 2003 30...

Страница 35: ...e In some designs frequently known as high voltage discharge sticks a resistor is connected between the electrode and the ground cable Both are used to discharge capacitive specimens to ground They mu...

Страница 36: ...AVTM6514J Rev A 03 2003 32...

Страница 37: ...r option defective equipment Equipment returned to the factory for repair must be shipped prepaid and insured This warranty does not include batteries lamps or similar items where the original manufac...

Страница 38: ...AVTM6514J Rev A 03 2003 34...

Страница 39: ...ath or ground wire 4 Remove safety ground jumper from cable under test 5 Set ON OFF switch to OFF and OUTPUT KILOVOLTS switch to ZERO START F WARNING Use only a three terminal grounded outlet instrume...

Страница 40: ...AVTM6514J Rev A 03 2003 36...

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