Test Equipment & Instrumentation, Hire, Sales & Technical Services

Megger BM11D up to 5kV

Home

MEGGER BM11D, BM21 AND BM25

 Analogue/Digital 5 kV Insulation Testers

• Spot tests and diagnostic insulation tests

• Simplicity and Ease of Use

• User safety features

• Unique rugged casing

• Analogue and Analogue/Digital Displays

• Wide range of test voltages

DESCRIPTION

The Megger BM11 series of 5 kV Insulation Testers provides a choice of features to suit all applications.

The series has been extended with three analogue/digital instruments; the BM11D, BM21 and BM25. These instruments show results and test options on a large, clear analogue/digital scale for both practicality and precision. A built-in timer makes both Spot Checks and Polarisation Index testing easier to carry out. They are powered by a built-in rechargeable lead-acid battery which can be charged directly from any supply from 95 V to 265 V. All testers incorporate a guard terminal to allow surface leakage to be removed.

Pre-set standard test voltages at 500 V, 1000 V, 2500 V and 5000 V are supplemented on the BM21 and BM25 units with a variable test voltage in 25 V steps. These top of the range units also allow measurement of resistance to 5 TW, leakage current to 0,01 nA and can display capacitance at the end of a test to 10 µF.

The BM25 extends the diagnostic testing capability of the range by performing automatic Polarisation Index, Step Voltage and Dielectric Discharge tests as well as providing an optically isolated RS232 port for downloading results during a test.

APPLICATIONS

The Megger BM11 series is designed for testing the insulation of high voltage electrical equipment and the wide voltage range also allows it to be applied to low voltage equipment.

Generators, motors, transformers, cables and switchgear all require effective maintenance and the test techniques on the Megger range give valuable diagnostic information.

Spot’ Insulation tests that are the most widely used, check on the general condition of electrical insulation, called up in most standards covering equipment design, testing, installation and maintenance. Insulation suffers from gradual steady decline, as well as occasional sudden damage; the effects of dirt, grease, moisture, vibration and chemical attack can be tracked through the recording of Polarisation Index tests which remove the temperature dependence of raw Insulation Resistance measurements. For finding more localised insulation problems, the BM25 includes both Step Voltage and Dielectric Discharge tests. Step Voltage identifies local weak spots because they respond differently as the electrical stress is increased, while the Dielectric Discharge test can show up a single bad layer in multilayer insulation.

The key to Predictive Maintenance is the trending of diagnostic tests and this is facilitated on the BM25 by the ability to use a PC to store results over time for trend analysis.

FEATURES AND BENEFITS

All BM11 Series

• Choice of test voltages

• Direct reading display

• Unique rugged case

• Guard terminal

• Designed for user safety

 BM11D

• Large, custom Analogue/Digital LCD

• Built-in timer

• Locking test leads for safety

• Battery indicator

•  Automatic discharge of capacitance

• Voltage measurement and warning

• Tests to 500 G

• Weather proof to IP54

 BM21: as BM11D plus;

• Variable test voltage in 25 V steps

• Breakdown or ‘Burn’ modes allow choice of diagnostic approach

• Shows capacitance at end of test

• Timer sets test duration for easier test control

• Tests to 5,000 GW

• Leakage current mode

BM25: as BM21 plus;

• Automated testing for increased productivity

• Polarisation Index and Step Voltage tests

• Dielectric Discharge test for multilayer insulation

• Optically isolated RS232 port for real-time download

 Please CONTACT US for information on the above instrument

	BACK TO:  Insulation Testers
	Top Of Page
	To add this site to your favourites click here