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Safety, Operation, and Procedure Instructions for the VLF Series of
AC Hipots
Equipment to be used by trained personnel only
This Operator Manual contains instructions for the operation of a High Voltage power source. The operator of this equipment
must use good judgement and follow all safety precautions noted in this guide to ensure the protection of himself and others in
close proximity to the test area.
or death. Proper grounding of the test set must be done prior to
connecting this unit to a power source.
Please Refer to
Documentation
Before Operation
Danger- Lethal Voltages:
Failure to follow the instructions could result in injury
VLF-50CMF
saMi n e
SERIES
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Table of Contents
Related Manuals for High Voltage VLF Series
Summary of Contents for High Voltage VLF Series
- Page 1 Equipment to be used by trained personnel only This Operator Manual contains instructions for the operation of a High Voltage power source. The operator of this equipment must use good judgement and follow all safety precautions noted in this guide to ensure the protection of himself and others in Failure to follow the instructions could result in injury close proximity to the test area.
- Page 2 VLF Operator Manual HIGH VOLTAGE, INC. 31 Route 7A Copake, N.Y. 12516 Phone 518/329-3275 • Fax 518/329-3271 http://www.hvinc.com E-mail: factory@hvinc.com...
- Page 3 Instrument Summary This instrument is a Very Low Frequency AC high voltage test system – a VLF hipot. It is an AC hipot whose frequency output is 0.1 Hz or lower, compared to the 50/60 Hz of a conventional AC hipot. The lower the frequency, the lower the current and power it takes to test a capacitive load like a cable.
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Page 4: Table Of Contents
T able of Contents About the Operator Manual S E C T I O N 1 General Information Operating Environment Safety Symbols Features and Specifications Controls and Indicators List of Components S E C T I O N 2 Setting up the Equipment 11,12 Typical VLF Connection Scheme Operating the Equipment... -
Page 5: About The Operator Manual
Section 1: Specifications and Controls. Section 2: Setup and Operation. Section 3: Performing Special Operations. The Functions, Features, and Specifications of the VLF Series of AC Hipots are also discussed in the VLF Brochure available from High Voltage, Inc. - 1 -... -
Page 6: General Information
VLF Series of Very Low Frequency AC Hipots manufactured by HIGH VOLTAGE, INC. Features and Specifi c ations The VLF-50CMF hipot test set provides true sine wave AC output voltage for the test of high voltage cables and other capacitive loads. - Page 7 14” Safety Grounding Hook with 20ft. lead. WARNING DO NOT OPERATE THE VLF HIPOT SET IF THE HIGH VOLTAGE TANK IS 5° OR MORE FROM LEVEL. IF THE UNIT IS OPERATED OUT OF LEVEL, OVERHEATING AND INTERNAL ARCING MAY OCCUR.
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Page 8: Operating Environment
Installation: Category II Pollution: Degree 2 WARNING DO NOT OPERATE THE VLF HIPOT SET IF THE HIGH VOLTAGE TANK IS 5° OR MORE FROM LEVEL. IF THE UNIT IS OPERATED OUT OF LEVEL, OVERHEATING AND INTERNAL ARCING MAY OCCUR. DO NOT STORE OR TRANSPORT VLF HIGH VOLTAGE SECTION... -
Page 9: Safety Symbols
O P E R A T O R M A N U A L Safety Symbol Identification Warning! Please refer to documentation before operation Protective Earth Terminal Warning: Hazardous Voltage... -
Page 10: Features And Specifications
Remote Control Size 17”w x 11”d x 9.5” high – 20lbs. Power Section Size 20”w x 14”d x 27” high – 160lbs. High Voltage Tank size 13.5”w x 19”d x 23” high – 310lbs. Complete Trolley 28”w x 60”d x 51” high Complete Trolley 775 lbs. -
Page 11: Controls And Indicators
The HIGH VOLTAGE ON (OFF) pushbuttons activate (de-activate) the high voltage power circuits. The LED indicators provide long life positive indication of the circuit status. The RED (ON) LED lights when high voltage is energized, the GREEN (OFF) LED lights when the high voltage is de-energized. - Page 12 An automatic return to zero function at time of high voltage off ensures energizing of high voltage at zero. The control must be at ZERO (0) to energize the high voltage circuits. The output control must always be returned to zero at the completion of testing, prior to de-energizing the output , allow the unit to cycle for 60 seconds to assure full discharge of the capacitance in the load.
- Page 13 The START TIMER switch starts the dwell timer on the front panel to time test duration. The timer can only be started when high voltage is energized. The timer is reset only after the high voltage is off and the START TIMER pushbutton is depressed.
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Page 14: List Of Components
O P E R A T O R M A N U A L List of included components with the VLF Hipot Ext. Intlk. jumper plug 10 ft. interconnect cable with grounds power section to HV tank. 20 ft. interconnect cable power section to control box 6 ft. -
Page 15: Setting Up The Equipment
The cooling and filter assembly of the VLF series will not operate properly if the high voltage tank is placed on uneven ground. A maximum angle for correct operation is 5°. Blocking the trolley to a level condition is acceptable. - Page 16 Upon reaching the dwell time, an alarm will sound indicating the need to return the Output Control to zero and turn off the high voltage, as noted in the Operating Manual, by allowing the output discharge solenoids and polarity solenoids to cycle at least ten more seconds (one full cycle).
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Page 17: Typical Vlf Connection Scheme
O P E R A T O R M A N U A L... -
Page 18: Operating The Equipment
When testing cables, either single or three phase, there are certain extra steps that must be observed to ensure safe operation. It should be noted that the VLF series test sets are not intended to be used on vacuum bottles or switchgear without cables connected. The VLF requires a minimum of .01uF load capacitance to achieve full output. - Page 19 O P E R A T O R M A N U A L First, the cable capacitance must be measured to determine the best operating frequency. Place the control near the cable being tested. Connect the input power terminal block to a grounded 230 v (+/-10%), 50/60 Hz source. A generator is an acceptable power source.
- Page 20 Place the OUTPUT MODE in the HIPOT position With the OUTPUT control at zero (zero start interlock engaged), depress the HV ON pushbutton. The HV ON light will glow. At this time the pump and fan on the high voltage section will also energize.
- Page 21 Using the BURN MODE on AC Cables 1. Ensure that all the steps listed in Setting up the Equipment have been accomplished. Take special note to ground the power section and the high voltage tank to a solid earth ground. Caution!!
- Page 22 15. Place the OUTPUT MODE in the BURN position 16. With the OUTPUT control at zero (zero start interlock engaged), depress the HV ON pushbutton. The HV ON light will glow. At this time the pump and fan on the high voltage section will also energize.
- Page 23 Kilovoltmeter and conventional fault locating techniques can be used. 20. After the test is complete, depress the HIGH VOLTAGE control in LOWER position, allowing the load to return to zero and the unit to cycle for about 3 more cycles prior to depressing the HV OFF pushbutton.
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Page 24: Vlf Cable Testing Recommendations
O P E R A T O R M A N U A L Recommended VLF Test Voltage Levels and Durati o ns With much of the world abandoning DC testing of solid dielectric cable, VLF AC hipots are becoming widely used. - Page 25 O P E R A T O R M A N U A L NOTES 1—For sinusoidal VLF the voltages are given in both rms and peak values. For a sinusoidal waveform the rms is 0.707 of the peak value if the distortion is less than 5%. 2—The results of field tests on over 15000 XLPE cable circuits tested showed that ~68% of the recorded failures occurred within 12 minutes, ~89% within 30 minutes, ~95% after 45 minutes, and 100% after 60 minutes (Moh [B17]).
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Page 26: Blank Page For Notes
O P E R A T O R M A N U A L THIS PAGE LEFT BLANK FOR APPLICATION NOTES... -
Page 27: Performing Special Operations
SECTION PERFORMING SPECIAL OPERATIONS The following section contains information on the care and upkeep of your new VLF SERIES AC Hipot. There are some notes on troubleshooting and service, which will save much time and money over the life of the unit. -
Page 28: Current Meter Re-Calibration
Oil Insulated High Voltage Tanks The oil-filled tanks in all the VLF SERIES of hipots are field serviceable. The only requirement is that the tank must be oil filled under vacuum at re-assembly. The parts to service the tank are available from HIGH VOLTAGE, INC. -
Page 29: Yearly Maintenance
The typical required yearly maintenance items are: 1) Calibration verification. 2) Thorough cleaning of the control and cooling section of the high voltage tank. 3) Replacing the HV insulating oil if necessary. Approximately every 2000 hours of use. -
Page 30: Return Materials
M A N U A L RETURNED MATERIAL If for any reason it becomes necessary to return any equipment or materials to High Voltage, Inc., the Service Department of High Voltage, Inc. must be notified, and authorization received, prior to the shipment of the equipment. -
Page 31: Warranty
High Voltage. repair by any person, firm or corporation not specifically authorized in writing by High Voltage, or (iii) defects caused by or due to handling by SALE AND DELIVERY. Unless otherwise agreed in writing, sale carrier, or incurred during shipment, transshipment or other move. - Page 32 If inspection deemed self-executing, and in the event that either party fails to appear at discloses that the defect is not one for which High Voltage is liable, then any properly noticed arbitration proceeding, an award may be entered Purchaser shall promptly reimburse High Voltage for all expenses incurred.
- Page 33 Top AC Bucket Truck Tester 600 kVDC @ 5mA HVI Products 10/2015...
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