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1、AVTM651017J Rev. A February 2003 Instruction Manual AVTM651017J for Impulse Generator/Cable Test System Catalog No. 651017 High-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 1
2、9485-1007 U.S.A. 610-676-8500 Shipping Address: Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403 U.S.A. RadioFans.CN 收音机爱 好者资料库 Copyright 2003 by Megger. All rights reserved. The information presented in this manual is believed to be adequate for the intended use of the produ
3、ct. If the product or its individual instruments are used for purposes other than those specified herein, confirmation of their validity and suitability must be obtained from Megger. Specifications are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 AVTM651017J Rev. A (02/2003) i Table of
4、Contents 1 Introduction. 1 Receiving Instructions . 1 System Overview. 1 2 Safety. 5 3 Specifications. 9 Electrical . 9 Metering.10 Physical Characteristics.11 Environmental.11 Cables Supplied.11 Safety Features.11 Operating Features.12 4 Description.13 Controls, Indicators, And Connectors.13 Circui
5、t Descriptions.17 5 Setup.21 6 Operation.25 Preliminary Check .25 Proof/Burn Mode Operation.26 Impulse Mode Operation.27 Shutdown Or Transfer Procedure.28 7 Service .31 Routine Maintenance.31 Troubleshooting .34 Troubleshooting Guide.36 Calibration Of Milliammeter.36 Calibration Of Kilovoltmeter.37
6、Output Cable Check.38 Replacement Of Components On Control Panel (Fig. 8).38 Repair .38 8 Performance Check.41 General.41 Impulse Function Test.41 Proof Function Test.42 Burn Operation Test.43 RadioFans.CN 收音机爱 好者资料库 AVTM651017J Rev. A (02/2003) ii 9 Parts List.45 Glossary.47 Warranty.49 List of Fig
7、ures Figure 1: Impulse Generator/Cable Test System. 2 Figure 2: Control Panel.14 Figure 3: Back Panel.16 Figure 4: System Schematic Diagram.18 Figure 5: Chassis Interior View.33 Figure 6: Metering Printed Circuit Board .35 Figure 7: High-Voltage Power Supply and Impulse and Discharge Assembly.35 Fig
8、ure 8: Control Panel, Rear View.39 AVTM651017J Rev. A (02/2003) 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 1-800-723-2861. Examine the instrument to determine
9、 if any damage occurred during transit. If damage is discovered, file a claim with the carrier at once and notify Megger of its nearest authorized sales representative, giving a detailed description of the damage. This instrument has been thoroughly tested and inspected to meet rigid specifications
10、before being shipped. It is ready for use when set up as indicated in this manual. SYSTEM OVERVIEW The Impulse Generator/Cable Test System locates cable faults by the high-voltage impulse method on cables rated up to 25 kV ac phase-to-phase. This system combines three related functions: dc proof tes
11、ting, dc cable fault burning, and impulsing. A common power supply is used. The system is housed in a sturdy metal cabinet using welded construction throughout to withstand the rigors of transport and operation in field vehicles. See Figure 1. It is expected that in normal use the system will be tra
12、nsported in a truck or van. There are rectangular base skids on the bottom of the cabinet if permanent installation in a van or trailer is desired. Mode of operation is selectable by a three-position MODE SELECTOR switch which may be set to GROUND, PROOF/BURN, or IMPULSE. A self-contained power supp
13、ly powers the system when the MODE SELECTOR switch is set to PROOF/BURN or IMPULSE. In the Proof/Burn mode, the system provides a continuous dc output which is used for the burn operation as well as for proof testing. When in the Impulse mode, a high-voltage capacitor is periodically charged and dis
14、charged to produce a high-energy pulse. This pulse is used as a traceable signal for cable fault location. AVTM651017J Rev. A (02/2003) 2 Figure 1: Impulse Generator/Cable Test System AVTM651017J Rev. A (02/2003) 3 The following is a brief description of the system operating modes: Proof Mode The pr
15、oof test is performed to determine whether cable insulation is good or bad. The cable under test is raised to the required voltage and held there for a prescribed period of time. If the insulation can withstand this voltage, the proof condition has been met and the cable is good. If the insulation i
16、s faulty (internal breakdown), the proof condition has not been met and additional testing is required to locate the fault. Burn Mode The burn mode is used to alter the electrical characteristics of the cable fault so that it will break down within the impulse voltage range of the system. This chang
17、e is produced by burning the cable fault, so as to char the walls of the fault and reduce its internal resistance. Reduced fault resistance means that the fault will break down at a lower voltage and will permit the use of the Impulse mode to produce a detectable arc or the use of a time domain refl
18、ectometer (TDR) to measure the distance to the fault. Impulse Mode In the Impulse mode of fault location, a high-voltage surge of energy is applied to the defective cable. This impulse travels along the cable until it reaches the fault location where the voltage causes an arc to occur and a large cu
19、rrent to pass through the return paths. The fault location along the cable length can be readily detected using an acoustic or electromagnetic impulse detector. AVTM651017J Rev. A (02/2003) 4 AVTM651017J Rev. A (02/2003) 5 Section 2 Safety This equipment and the cable to which it is connected are so
20、urces of high-voltage electrical energy. All persons performing or assisting in tests must use all practical safety precautions to prevent contact with energized parts of the test equipment and related circuits. Persons actually engaged in the test must stand clear (by at least 3 ft) of all parts of
21、 the complete high-voltage circuit unless the system is de-energized and all parts of the test circuit are grounded. Persons not directly involved with the work must be kept away from test activities by suitable barriers, barricades or warnings. An interlock circuit is provided to enable the operato
22、r to enclose all parts of the complete high-voltage circuit within a secure area. The interlock circuit should be used to shut off input power automatically upon unauthorized entry into the high-voltage area. ! Safety is the responsibility of the user. ! Misuse of this high-voltage equipment can be
23、extremely dangerous. ! The purpose of this equipment is limited to use as described in this manual. Do not use the equipment or its accessories with any device other than specifically described. ! Never connect the test equipment to energized equipment or use in an explosive atmosphere. ! A qualifie
24、d operator should be in attendance at all times while the test equipment is in operation. ! The safety ground jumpers and surge grounds must be properly connected (refer to Section 5). ! Refer to IEEE 510-1983 IEEE Recommended Practices for Safety in High- Voltage and High-Power Testing and follow t
25、he applicable safety recommendations. ! Observe the safety warnings marked on the equipment. Treat all terminals of high-voltage power equipment as a potential electric shock hazard. There is always the potential of voltages being induced at these terminals because of proximity to energized high-vol
26、tage lines or equipment. Always use a safety ground stick to ground the high-voltage conductor. A safety ground jumper must then be installed between the high-voltage conductor and ground of the cable under test. The ground connection must be the first made and the last removed. Any interruption of
27、the grounding connection can create an electric shock hazard. Systems of this type should not be used to fault locate on direct-buried unshielded or secondary cable. Dangerously high differences in potential may be developed in the current return path to the system. AVTM651017J Rev. A (02/2003) 6 Sy
28、stems of this type should not be used to fault locate on any cable which is likely to be near enough to an energized cable to allow a burn through of the insulation of the energized cable. This situation may occur when the cables are located in a common trench, duct, or tray. High-voltage electrical
29、 impulses and resultant current pulses create special safety problems because a large, rapidly changing current, even across small values of impedance, can generate high-voltage levels. Two separate and distinct grounds are provided: the chassis ground and the surge ground. The chassis ground, which must be connected to a good local earth ground, is designed to protect the operator by preventing a difference of potential between the chassis and the groun
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