Insulation plays a very important role in an electrical system. Without electrical insulation, the electricity flowing in the conductors is exposed to short circuit to other conductors or create the risk of electrocution to personnel. It is important to always check the integrity of insulation to ensure the safety and reliability.
Megger test equipment is one of the best choices when it comes to insulation resistance measurement. These devices boast features to simplify and accurately assess insulation condition. Here are some of the popular equipment available on the market.
Megger MIT525 5kV Insulation Resistance Tester
The MIT525 is a light and compact device that lets you measure resistance from 100 kΩ up to 10 TΩ. It allows you perform various insulation tests like Dielectric Absorption Ratio, Polarization Index, Step Voltage, Ramp and Dielectric Discharge testing.
Specifications:
- Has an analog resistance range of 100 kΩ up to 10TΩ
- Has a digital range of 10 kΩ up to 10TΩ
- 3 mA short circuit current
- Selectable output voltage at 250, 500, 1000, 2500 and 5000 Volts
- Insulation alarm from 100 kΩ up to 1 GΩ
- < 3 s per μF at 3 mA and <250 ms/μF discharge time
- Can measure current from 0.01 nA up to 6 mA with an accuracy of ±5% at all voltages
- Integrated time with a range of up to 99 minutes
- Can perform IR(t), IR, PI, DAR, DD, SV and Ramp Test
- Built-in memory function that continuously logs data every 5 seconds for up to 10 5 1/2 hours or 350 IR test results or 350 PI test results
- Integrated EMI suppression circuit that can reject noise at 1 mA per 250 Volts max 3 mA
- Capacitance range of 10 nF up to 25 μF
- Ingress Protection 64 rating
- Can withstand 3000 m CAT rating maintained >2000 m
Megger MIT1025 10kV Insulation Resistance Tester
This tester is similar to the MIT525 but has a 10 kiloVolt output test voltage. This allows you to test resistance up to 20TΩ.
Specifications:
- Has an analog resistance range of 100 kΩ up to 20TΩ
- Has a digital range of 10 kΩ up to 20TΩ
- 3 mA short circuit current
- Selectable output voltage at 500, 1000, 2500, 5000 and 10000 Volts
- Insulation alarm from 100 kΩ up to 1 GΩ
- < 3 s per μF at 3 mA and <250 ms/μF discharge time
- Can measure current from 0.01 nA up to 6 mA with an accuracy of ±5% at all voltages
- Integrated time with a range of up to 99 minutes
- Can perform IR(t), IR, PI, DAR, DD, SV and Ramp Test
- Built-in memory function that continuously logs data every 5 seconds for up to 10 5 1/2 hours or 350 IR test results or 350 PI test results
- Integrated EMI suppression circuit that can reject noise at 1 mA per 250 Volts max 3 mA
- Capacitance range of 10 nF up to 25 μF
- Ingress Protection 64 rating
- Can withstand 3000 m CAT rating maintained >2000 m
- RS232 and USB interface for PC connection
- Compatible with PowerDB
Megger S1-554 5kV Insulation Resistance Tester
This device is designed to assist you in troubleshooting and maintenance of insulators. It has a large and easy to read LCD display that is also backlit. It also has adjustable limit alarms and timers. The case is durable and light, making it suitable not only for industrial but also for field applications.
Specifications
- Selectable test voltage output at 50, 5000 and 10000 volts
- Automated testing of IR, SV, PI DD and DAR
- Can measure insulation resistance up to 15TΩ
- On board memory for storing test results
- Rejects electrical noise of up to 4 mA with built-in software filtering
- Analog and digital readouts
- Voltage input from 85-265 Volts AC 50/60 Hertz
- Battery operation of 6 hours continuous testing
- USB and RS232 ports for PC connectivity
- 500 kΩ leakage with 100 MΩ 2% error guarding
- ±5% accuracy to 1 TΩ and ±20% to 10 TΩ
Related electrical test equipment available for rent from Protec:
AEMC 1026 1kV Digital Megohmmeter
Amprobe DM-III Multitest Power Quality Recorder
This electrical test equipment is available for rent, lease, or purchase from Protec Equipment Resources. We are here to help you with your testing equipment needs.
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Editor’s Note: This post was originally published September, 2012 and has been updated freshness, accuracy and comprehensiveness.