Insulation Resistance Measurement

Insulation Resistance Measurement (4)

Wednesday, 12 August 2015 04:39 Written by

MD 5075x

The digital insulation tester model MD-5075x is Megabras' cutting edge insulation analyzer equipment and it is one of the most complete and sophisticated available in the international market. A powerful software allows for further analysis of tests results, including features such as graphical representation and automatic report generation. Its proven technology provides safe, reliable and accurate measurements of insulation resistances up to 5 TW, with 4 pre-selected test voltages, 500 V - 1 kV - 2.5 kV - 5 kV. Other test voltages may be selected in steps of 25 V, 100 V or 500 V.

A state-of-the-art microprocessor controls the equipment operation and enables the incorporation of advanced features which make measurements easier: auto-range selection, 4,000 readings memory, AC/DC voltmeter, automatic measurement of Absorption Index and Polarization Index, leakage current and capacitance measurement, timer enabling programming of test duration, configurable Pass-Fail test, Step voltage test, built-in printer, real time clock and calendar.

Built-in chronometer, indicating elapsed time, in minutes and seconds, since the test started, up to 90 minutes.

Features

 

  • Insulation Resistances up to 5 TΩ 
  • Automated tests:
    •   Absorption index
    •   Polarization index
    •   Capacitance
    •   Leakage Current
    •   AC/DC Voltmeter 
  • Step voltage test       
  • Switchable filter to remove external noise interference
  • Real time clock and calendar 
  • 4,000 readings memory
  • USB Interface
  • Software for data management
  • Built-in printer
  • Rechargeable battery

Specifications

Specification  
Test voltage 500 V, 1,000 V, 2,500 V, 5,000 V directly, one button selectable. 500 V to 5 k V in 25 V, 100 V or 500 V steps. DC, negative.
Maximum resistance reading 5 TΩ @ 5 kV
DC Voltmeter

 10 V up to 1000 Vdc.

Accuracy: ±(5% of reading + 3 digits)



AC voltmeter

 10 V up to 1000 Vr.m.s.

Accuracy: ±(5% of reading + 3 digits)



 Overvoltage Category   CAT -III 600V
 Leakage current measurement

 50 nF up to 10 µF @ 500 V

50 nF up to 5 µF @ 1,000 V

30 nF up to 2 µF @ 2,500 V

30 nF up to 1 µF @ 5,000 V.

Accuracy: ±10% of reading ± 3 digits.

 Short circuit current  Max. 3 mA
 Test voltage accuracy  ± 3% of nominal test voltages on GΩ
 Insulation tester basic accuracy

 ± 5% of reading 1 MΩ to 1 TΩ @ 5 kV

± 20% of reading 1 TΩ to 5 TΩ @ 5 kV

(for lower test voltages, the upper limit will be reduced proportionally).

± 20% of reading 10 kΩ to 100 kΩ.

± 10% of reading 100 kΩ to 1 MΩ.

Advanced features

Automated Polarization Index calculation

Automated Dielectric Absorption Ratio calculation.

Programmable Pass-Fail test.

Step Voltage Test.

4,000 Readings memory.

Switchable filter to remove external noise interference

Wednesday, 12 August 2015 04:44 Written by

MD 5060x

The Megabras MD-5060x is a smart, microprocessor-controlled, 5kV insulation tester and analyzer. Besides the conventional measurement of insulation resistances up to 5 TW, its advanced features allow to automatically measure both the Polarization Index and Dielectric Absorption Index, thus significantly simplifying testing of transformers.

This insulation tester is a portable, battery-powered equipment. Test voltage may be chosen from 500V to 5 kV in 100 dddV increments. Due to its measurement principle (actual voltage and current readings) the accuracy of resistance measurement is not affected by any test voltage error. Nevertheless, the High-Voltage generator is electronically stabilized with a better than 2% accuracy in open-circuit condition and for any normal operation battery voltage.

The MD-5060x is powered using a rechargeable battery and has an automatic charger that may be connected to 100 - 240V mains supply. The cabinet is strong and lightweight, easy to carry, impact-resistant and suitable to be used under severe weather conditions. Thus the megohmmeter supplies very reliable and accurate measurements both in laboratory and out in the field.

Features

  • Insulation resistance
  • Auto-range
  • Guard terminal
  • Automated tests:
    • Absorption index
    • Polarization index
  • Real time clock
  • 4000 Readings memory
  • USB Interface
  • Programable pass-fail
  • Built-in printer
  • Rechargeable battery

Specifications

Specifications  
Test Voltages

500 V, 1,000 V, 2,500 V, 5,000 V directly, one button selectable

500 V to 5 kV in 100 V increments.

DC, negative.

Maximum resistance reading 5 TΩ @ 5 kV.
Short circuit current 1.5 ± 0.5 mA.
Megohmmeter basic accuracy ± 3% of nominal test voltages on 10 GΩ.
Advanced features

Automated Polarization Index calculation.

Automated Dielectric Absorption Ratio calculation

Programmable Pass-Fail test.

Step Voltage Test.

Built-in printer Prints elapsed time, actual voltage and resistance measured each 15 seconds.
Wednesday, 12 August 2015 04:57 Written by

MI20KVe

The MI-20KVe High-Voltage insulation tester is a truly portable device that allows the measurement of insulation resistances using test voltages up to 20 kV.

It employs a state-of-the-art technology for the safe measurements of insulation resistances up to 4,000,000 MΩ with four test voltages: 5 kV - 10 kV - 15 kV and 20 kV.

Analogue indicator, having a broad scale.

Due to its reduced size and weight, its power autonomy and mechanical strength, this insulation tester is suitable for working out in the field, under severe weather conditions. It is powered with a rechargeable battery, with a charger for 110 V/220 V. In order to protect the equipment, the cabinet is water and dust resistant. Protection grade is IP54, and the insulation tester is supplied with a complete kit of high voltage test leads.

Features

  • Insulation test up to: 4 TΩ
  • 4 Test voltages: 5 kV - 10 kV - 15 kV - 20 kV
  • Guard terminal
  • Rechargeable battery
  • Multiple scales for precision improvement
  • Portable, accurate & rugged
  • IP-54 Protection

Specifications

Specifications   
Test voltages 5 kV - 10 kV - 15 kV - 20 kV.
Maximum resistance reading

1 TΩ @ 5 kV. 

2 TΩ @ 10 kV. 

3 TΩ @ 15 kV. 

4 TΩ @ 20 kV.

Short circuit current 500 µA.
Test voltage accuracy ± 2% of nominal test voltages on R ≥ 10 GΩ.
Internal current limiting resistance

10 MΩ @ 5 kV.

20 MΩ @ 10 kV.

30 MΩ @ 15 kV.

40 MΩ @ 20 kV.

Insulation tester Accuracy Class 2 (±2 % of full scale deflection).
Analogue indicator  Up to 98 mm scale length, taut band, with mirror 
Wednesday, 12 August 2015 05:10 Written by

MI15KVe

The MI-15KVe High-Voltage insulation tester is a truly portable device that allows the measurement of insulation resistances using test voltages up to 15kV. 

It employs a state-of-the-art technology for the safe measurements of insulation resistances up to 3,000,000 MW with four test voltages: 1 kV - 5 kV - 10 kV and 15 kV. 

Readings are performed through an easy-toread analogue indicator, having a broad scale.

Due to its reduced size and weight, its power autonomy and mechanical strength, this insulation tester is suitable for working out in the field, under severe weather conditions. It is powered with a rechargeable battery, with a charger for 110 V/220 V. In order to protect the equipment, the cabinet is water and dust resistant. Protection grade is IP54, and the insulation tester is supplied with a complete kit of high voltage test leads.

Features

  • Insulation test up to: 3 TΩ
  • 4 Test voltages: 1 kV - 5 kV - 10 kV - 15 kV
  • Guard terminal
  • Rechargeable battery
  • Multiple scales for precision improvement
  • IP-54 Protection

Specifications

Specifications  
Test voltages 1 kV - 5 kV - 10 kV - 15 kV.
Maximum resistance reading

200 GΩ @ 1 kV.

1 TΩ @ 5 kV.

2 TΩ @ 10 kV.

3 TΩ @ 15 kV

Short circuit current 1 mA.
Test voltage accuracy ± 2% of nominal test voltages on R ≥ 10 GΩ.
Internal current limiting resistance

1 MΩ @ 1 kV.

5 MΩ @ 5 kV. 

10 MΩ @ 10 kV.

15 MΩ @ 15 kV.

Insulation tester Accuracy Class 2 (±2 % of full scale deflection).
Analogue indicator Up to 98 mm scale length, taut band, with mirror.