Adiradh Energy offers Megger BM5200 tester which is a battery powered instrument with digital and analogue arc display, designed for high voltage insulation resistance testing in the maintenance and servicing of cables, rotating plant machinery, transformers, switchgear and industrial installations. DC insulation tests are performed at 250 V, 500 V, 1000 V, 2500 V and 5000 V. Insulation resistance tester BM5200 in India measuring range is 100 kΩ to 1000 GΩ. Automatic discharge for capacitive circuits under test is provided and decaying voltage displayed.The guard terminal can be used to minimise the effects of surface leakage and hence erroneous measurements when carrying out insulation resistance tests.Three insulation resistance (IR) test modes are provided, (InS, PI and t) and available in any IR test range. In IR mode (InS) tests are initiated by pressing and holding down the TEST button for two seconds and terminated by a second press of the TEST button.A Polarisation Index (PI) mode performs a ratio metric test that calculates the ratio of insulation resistance at ten minutes to insulation resistance at one minute. The IR test timer (t) mode facilitates a single fixed time test based on the set time interval t.
For capacitive test objects the instrument will automatically discharge through an internal resistor and indicate voltage across the terminals in range 25 V to 600 V with higher voltages indicated by >600 V. This feature will give decaying voltage indication following the testing of reactive loads. When the voltage indicator disappears it is safe for the user to disconnect the test leads. 5KV Insulation resistance tester BM5200 in India is powered by eight 1.5 V IEC LR6 (AA) cells. Part Number of 5KV Insulation tester Megger BM5200: 1001-289
■ 1 TΩ, 1.4 mA, 5 kV digital insulation tester with digital and analogue display
■ Five test ranges; 250 V, 500 V, 1000 V,2500 V and 5000 V
■ Insulation (InS), Polarisation Index (PI) and variable timed test (t) modes
■ Selectable DC or AC (incl. frequency) voltmeter functions
■ Guard terminal to shunt surface leakage currents
■ CAT III 600 V safety rating
Electrical insulating materials deteriorate with time leading to breakdowns and costly repair bills. Insulation resistance testers apply a regulated DC voltage across the insulation and measure current flow through it applying Ohm’s law to calculate insulation resistance. The current flows because no insulation material is perfect.5KV Insulation resistance tester -BM5200 tester uses includes:
Product test and qualification
Installation of equipment
Insulation testing with high voltage DC affects insulation polarisation such that consecutive testing without complete discharge of the unit under test will yield different results.Care should be taken to always employ the same process and technique of connecting to and testing an insulator to be able to trend results. It is important to record temperature of the insulation as well as IR values
BM5200 Insulation tester with 8m lead set Part No: 1002-472 also available in India
Brochure for Insulation resistance tester BM5200
5KV Digital Insulation resistance tester BM5200 user manual
|Insulation range||100 kΩ to 1 TΩ|
|Nominal test voltages||250 V, 500 V, 1000 V, 2500 V, 5000 V|
|Terminal voltage accuracy||< 1000 V 0…+10% of nominal test voltage
≥1000 V 0…+5% of nominal test voltage
|Insulation accuracy||Up to 1 GΩ: All ranges ±5% ±2 digits
Over 1 GΩ:
5000 V ±5% ±0.04% per GΩ
2500 V ±5% ±0.08% per GΩ
1000 V ±5% ±0.2% per GΩ
500 V ±5% ±0.4% per GΩ
250 V ±5% ±0.8% per GΩ
|Short circuit/charge current||1.4 mA ±0.5 mA|
|Maximum capacitance of load||5 μF|
|Voltmeter accuracy||3% ± 3 V|
|Frequency measurement||45 Hz to 65 Hz|
|Frequency measurement accuracy||±2 Hz|
|Voltmeter range||Up to 600 V a.c. or d.c.|
|Power supply||8 x LR6/AA batteries (included)|
|Battery life||5 lbs (2.3 kg)|
|5 hours @ 5 kV into 100 MΩ with AA Alkaline LR6||5 lbs (2.3 kg)|
|Guard||2% error guarding 5 MΩ leakage on 100 MΩ load|
|Operating temperature range and humidity||-20 to +55 °C|
|Humidity||90% RH, 0 to 40 °C
70% RH, 40 to 55 °C
|Storage temperature range||-20 to +65 °C|
|Safety protection||Insulation Cat III 600 V|
|EMC||The product conforms to IEC 61326|
|Dimensions||220 mm x 115 mm x 163 mm|
Various types of diagnostic insulation tests:
Spot Reading Test (IR )(IR(t)): The simplest of all insulation tests and the one most associated with lower voltage insulation testers; the test voltage is applied for a short, specific period of time and a reading is then taken
Time vs. Resistance Test (DAR): The concept of the time resistance test is to take successive readings at specified times during a single test.
Polarization Index Test (PI): The simplest implementation of the time resistance test for solid insulation, the PI Test requires only two readings followed by a simple division; the one-minute reading is divided into the ten-minute reading to provide a ratio. With “good” insulation, leakage current is relatively small and resistance rises continually as current decreases from the effects of charging and dielectric absorption
Dielectric Discharge Test (DD): While the other methods mentioned measure the currents flowing during the charging process, the DD test measures the current that flows during discharge of the test sample.
Step Voltage Test (SV): Since good insulation is resistive, an increase in test voltage will lead to an increase in current with a result that the resistance remains constant. Any deviation from this could signify defective insulation. At lower test voltages, say 500 V or 1000 V, it is quite possible that these defects might be unobserved, but as the voltage rises we reach a point where ionization can take place within cracks or cavities, resulting in an increase in current, and therefore a reduction in the insulation resistance.
Ramped Voltage Test: The ramped voltage test is endorsed in IEEE95-2002 as part of the recommended practice for insulation testing of AC electric machinery (2300 V and above) with high direct voltage. When using this test method, the test voltage is gradually increased (ramped) at a set rate to a final level, which results in an increase in the current. Any variations in current compared to the increase in applied test voltage can provide useful diagnostic information about the condition of the insulation.
Choose an insulation tester?
You should also base your voltage requirements on the rated voltage of the equipment you are working with, specifically whether or not you will be performing tests at or above rated, i.e. stress tests.Something to keep in mind is that pervasive insulation damage, such as moisture ingress, is revealed at any voltage; whereas mechanical damage usually requires a higher voltage for detection – capable of arcing an air gap.With 1 kV, 2.5 kV, and 5 kV models to choose from, this may be the most critical decision you have to make.
When working in the realm of predictive maintenance, it’s critical to know exactly how your measurements change over time, specifically in the upper values of resistance. Insulation testers allow you to test into the tera ohm range (TΩ) – giving you the capability to differentiate between elevated resistance measurements over time. It may be helpful to determine the exact insulation resistance values of your equipment when it’s new, and then choose a tester that can truly measure those values.
Batteries are likely the most convenient,
Insulation testers will detect unwanted voltage on the item under test
Combine both Analogue and LCD display capabilities in a single unit suggestable
Okay, these are commonly referred to as “continuity” and “resistance” ranges, which greatly enhance the depth of your testing capabilities. Ohm ranges can help you verify the integrity of circuits and connections, while kilohm ranges are helpful for identifying areas of insulation deterioration.
To eliminate certain components of leakage from measurements, should take the guard terminal into consideration.
From a few rupees thousands to several Lakhs , we have an insulation tester for every budget. Don’t let the price tag fool you either. Regardless of your budget, you’ll find a model that not only fits your testing requirements, but also offers a range of additional features too.
Newer models offer pre-programmed standardized tests, such as Polarization Index, Step Voltage, and Dielectric Discharge, along with calculation and storage of results, downloading capabilities, timed tests, leakage current measurements, and a “burn mode”.We recommend that if it fits your budget – go for it!
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