Megger MIT30 Instruction Manual
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Megger MIT30 Instruction Manual

Megger MIT30 Instruction Manual

30kv dc insulation tester
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AVTMMIT30-EN
Rev E02
June 2009

Instruction Manual

-30kV DC Insulation Tester
MIT30
Catalog No. MIT30
High Voltage Equipment
THIS EQUIPMENT PRODUCES
INSTANTANEOUSLY LETHAL VOLTAGE
Please read carefully before operating
Safety is the responsibility of the user
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.
610-676-8500
www.megger.com

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Summary of Contents for Megger MIT30

  • Page 1: Instruction Manual

    AVTMMIT30-EN Rev E02 June 2009 Instruction Manual -30kV DC Insulation Tester MIT30 Catalog No. MIT30 High Voltage Equipment THIS EQUIPMENT PRODUCES INSTANTANEOUSLY LETHAL VOLTAGE Please read carefully before operating Safety is the responsibility of the user Valley Forge Corporate Center...
  • Page 3 -30kV DC Insulation Tester MIT30 Catalog No. MIT30 Instruction Manual...
  • Page 4 Copyright© 2009 by Megger. All rights reserved. The information presented in this 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 validity and suitability must be obtained from Megger.

  • Page 5: Table Of Contents

    Table of Contents 1 INTRODUCTION ............1 How to Use this Manual............ 1 2 SAFETY PRECAUTIONS ..........3 3 RECEIVING INSTRUCTIONS ........7 4 SPECIFICATIONS ............9 Input ..................9 Output .................. 9 Control ................10 Safety .................. 11 Physical ................11 Environmental ..............
  • Page 6 AVTMMIT30-EN Rev E02 June 2009...

  • Page 7: Introduction

    INTRODUCTION This instruction manual is intended as a guide to the operation of the MIT30. The instructions and suggestions provided in his manual anticipate the normal use of the insulation tester for testing electrical insulation systems. In the normal course of testing, a specimen or system is subjected to high DC voltage.
  • Page 8 appear in the format shown below and are defined as follows: WARNING! Warning, as used in this manual, is defined as a condition or practice which could result in personal injury or loss of life. CAUTION Caution, as used in this manual, is defined as a condition or practice which could result in damage to or destruction of the...

  • Page 9: Safety Precautions

    SAFETY PRECAUTIONS SAFETY IS THE RESPONSIBILTY OF THE USER The test set and the equipment to which it is connected is a source of high-voltage electrical energy. All persons performing or assisting in the tests must use all practical safety precautions to prevent contact with energized parts of the test equipment and associated circuits.
  • Page 10 WARNING Never connect the test set to energized equipment or use the test set in an explosive atmosphere. All apparatus to be tested should be bonded to ground except during the actual test. Test connections should be made with the ground bonds in place.
  • Page 11 Megger considers this an excellent safety practice. WARNING Do NOT use the MIT30 test set for any purpose not described in this instruction manual and do not use accessory items for any purpose except with the specified equipment.
  • Page 12 AVTMMIT30-EN Rev E02 June 2009...

  • Page 13: Receiving Instructions

    Examine the instrument for damage received in transit. If any damage is discovered, file a claim with the carrier at once and notify Megger or it’s nearest authorized sales representative giving a detailed description of the damage observed. This instrument has been thoroughly tested and inspected to meet rigid inspection specifications before being shipped.
  • Page 14 AVTMMIT30-EN Rev E02 June 2009...

  • Page 15: Specifications

    SPECIFICATIONS INPUT 85 – 264 VAC, 110 – 350 VDC Voltage: DC, 47 – 440 Hz Frequency: 35 VA Maximum: Double Pole 5 x 20mm ceramic Fusing: 3.15A slow blow fuse, 500 VAC C14 acc. to IEC/EN 60320-1 Power Inlet: OUTPUT 0 to -30 kV Voltage:...

  • Page 16: Control

    < 50 mJ Stored energy: 3 meter (9.8 feet) Test Connection: triaxial cable (-HV, guard and current sense) terminated with crocodile clips. CONTROL  Mains ON/OFF switch integrated with power inlet and fuse holder  High Voltage power supply control with integrated Zero-Start switch ...

  • Page 17: Safety

    SPECIFICATIONS SAFETY  33MΩ Fail-Safe Internal Discharge Switch  Integrated Zero-Start switch  High Voltage warning lamp  High strength plastic case  Cable interlock  Air-transport pressure relief valve PHYSICAL 360 mm (14.2 in) Length: 304 mm (12 in) Width: 194 mm (7.6 in) Depth:...

  • Page 18: Environmental

    ENVIRONMENTAL 67 with case closed for IP rating: transport (as defined by Standard 81-41/STANAG 4280) 52 when in use -10C to 55C (14 F to 131F) Operating temperature: -20C to 70C (-4 F to 158 F) Storage temperature: 0 – 90% (non-condensing) Humidity: 1600m (MSL) (5200 ft MSL) Maximum Altitude...

  • Page 19: Description

    DESCRIPTION This Insulation test set measures the electrical quantities of applied voltage and the resultant current in the apparatus to which it is connected. Designed for field use, the test set is built into a durable, rotary molded, impact resistant case with carrying strap.
  • Page 20 AVTMMIT30-EN Rev E02 June 2009...

  • Page 21: Setting Up

    SETTING UP Test controls and terminals are identified in Section 6. The following steps are listed as a general guide for setting up the insulation tester. Before setting up the equipment make sure you have read and understand Section 2 of this manual entitled SAFETY.

  • Page 22: Clearances

    meters and panel markings easily without approaching the energized high-voltage terminals. CLEARANCES 1. Be sure adequate clearances are maintained between energized conductors and ground to prevent arc over. Such accidental arc-overs may create a safety hazard or damage the equipment being tested. The position of the exposed conductors with respect to ground can often be maintained in place with clean, dry nylon rope.

  • Page 23: Connections Procedure

    SETTING UP CONNECTION PROCEDURE 1. Ground and bond all terminals of the test object to a known, good earth ground point. 2. With the test set switch off, connect the power cord to the mains supply. WARNING The third wire in the input power line is the system ground.
  • Page 24 AVTMMIT30-EN Rev E02 June 2009...

  • Page 25: Operation

    OPERATION When the test set and apparatus to be tested are set up as indicated in Section 6, the equipment can be energized and the required tests run by following the steps given below. Note: Before operating the test set, read Section 2 of this manual and ensure that all appropriate safety precautions are observed.
  • Page 26 6. Rotate the voltage control to 0.0 to engage the zero-start interlock. Ensure the locking collar is not engaged. 7. Depress the GREEN illuminated button on the panel to engage the HV WARNING HIGH VOLTAGE PRESENT 8. When the RED button illuminates, rotate the voltage control knob until the desired voltage is attained.

  • Page 27: Use Of Guard

    OPERATION WARNING Use an external safety grounding/discharge rod or “hot stick” to prove that the system has been de-energized prior to handling. 12. Apply safety grounds to the apparatus 13. If desired, disconnect the HV clip from the apparatus Notes: ...
  • Page 28 resistance along the leakage path from the conductor over the surface of the termination may be less than that within the major length of the cable. Under such conditions the guard feature of the test set is useful in excluding the leakage of the surface path from the measurement.

  • Page 29: Routine Maintenance

     Inspect power cable. It is vitally important that the ground pin is mechanically sound. The cable should be free of cuts or radical changes in geometry. There are no user serviceable parts or assemblies contained within the MIT30. AVTMMIT30-EN Rev E02 June 2009...

  • Page 30: Inspection And Maintenance Procedure

    INSPECTION AND MAINTENANCE PROCEDURE Proceed according to the steps below: 1. Visually inspect the unit case, noting that hinges and case locks function properly 2. Check for breaks and or cracks in the case or 3. Check that the cable bag remains firmly affixed to the lid 4.

  • Page 31: Calibration Procedure

    ROUTINE MAINTENCE clip should be smooth and clean. If the unjacketed portion of the HV cable is dusty, wipe it down with a clean dry lint free cloth. 9. Check that all knobs rotate smoothly throughout their entire range, that all knobs are firmly affixed, and in serviceable condition with no cracks.
  • Page 32 9. Turn the voltage control knob to 10.0. 10. Adjust R38 on control PCB until -30.00 kV is read on the calibration voltmeter. 11. Adjust R40 until the MIT30 voltmeter reads - 30.00. 12. Disengage high voltage. 13. De-energize unit. Restore unit to case.
  • Page 33 ROUTINE MAINTENCE 4. Energize unit. 5. Engage high voltage (DANGER! HIGH VOLTAGE PRESENT!). 6. Raise MIT30 output voltage until 300 µA is displayed or the 30 kV limit is achieved. 7. Read current measured through calibration ammeter. 8. Read current measured by on-board ammeter.
  • Page 34 AVTMMIT30-EN Rev E02 June 2009...

  • Page 35: Theory Of Operation

    The MIT30 is an adjustable, high voltage DC power supply, capable of sourcing 330 µA. Output voltage and current is displayed on high contrast, liquid crystal displays. The MIT30 has an active over current trip that can be adjusted between 3% and 120% of full rated current.
  • Page 36 The discharge switch is ballasted with a 33 MΩ resistor. As mentioned above, the MIT30 indicates voltage, current and has an audible ionization indicator. Voltage measurement is accomplished through a highly protected, 2 GΩ input impedance circuit.

  • Page 37: Troubleshooting

    OPERATION/TROUBLESHOOTING Troubleshooting Chart Figure 1 AVTMMIT30-EN Rev E02 June 2009...
  • Page 38 AVTMMIT30-EN Rev E02 June 2009...

  • Page 39: Nomenclature

    NOMENCLATURE Field Replaceable and Recommended Spare Parts Due to the size constraints of the MIT30 design, advanced polymeric insulation systems are required. As a result, the only field replaceable components in the system are the following: Description Megger P/N Fuse, 5x20 mm, ceramic, SB*,▼...
  • Page 40 Figure 2 AVTMMIT30-EN Rev E02 June 2009...
  • Page 41 NOMENCLATURE This page intentionally left blank. AVTMMIT30-EN Rev E02 June 2009...
  • Page 42 Figure 3 ITEM PART NO. DESCRIPTION 90001-269 Fuse, 5x20 mm, ceramic, SB*,▼ 36258-1 Control Power LED* (GREEN) 36258 Cable Interlock LED* (RED) 36258 Over-current Trip LED (RED) 37282 Over-current Trip Reset Switch* 37259 Ionization Audio Control Potentiometer 37252 Voltage Control Potentiometer 1000-921 Output Cable* 1001-116...
  • Page 43 NOMENCLATURE Figure 4 AVTMMIT30-EN Rev E02 June 2009...
  • Page 44 Figure 5A Figure 5B ITEM NO. PART NO. DESCRIPTION 37264 Control PCB* 90000-755 +24 VDC Power Supply* *Recommended spares kit ▼Should be replaced in pairs AVTMMIT30-EN Rev E02 June 2009...

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