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Track and Locate Ground Faults on Battery Systems with the Megger BGL

Megger-BGLThe Megger Battery Ground-Fault Locator (BGL) allows tracking and locating of ground faults on live or dead battery systems. Its locating ability is only limited by the accessibility of the battery cable.

The instrument can make measurements in the presence of dc current (up to 20 amperes) and ac ripple (charging current up to 0.5 ampere).

The Megger Battery Ground-Fault Locator is useful for locating grounds on any type of battery system, including those in refineries, mines and utilities as well as UPS and continuous process systems.

The Megger BGL operates on battery systems that are either floating or grounded through a resistor. Operators can determine both the direction and magnitude of faults, allowing them to ignore high-impedance faults and concentrate on serious faults.

The BGL is designed to work on battery systems up to 260 volts dc. The instrument even operates in the presence of surge-suppression capacitors, effectively ignoring them. It is only sensitive to the power dissipated in the grounding resistance, hence the resistive paths to ground.

An additional feature of the BGL is its ability to measure battery system total capacitance to ground, or the capacitors of any branch of the system. This allows the operator to determine the maximum practical fault resistance range and provides the user with information on the battery system.

Megger Battery Ground-Fault Locator specifications:

Input (specify one)

120 V, 60 Hz, 30 VA OR 240 V, 50 Hz, 30 VA


Lead-acid rechargeable

Resistance Range

1 ½ to 100 k½

Capacitance Range

1 to 100 μF


±15% to ±40%

Item (Qty) Cat. No.

Battery Ground-Fault Locator

120 volt, 60 Hz 835140

240 volt, 50 Hz 835140-1

220 volt, 60 Hz 835140-2

120 volt, 50 Hz 835140-3

Injected Signal

25 Hz nominal, 3.5 V rms maximum, 110 mA maximum

Maximum Ripple Current

0.5 A (ac)


Operating Temperature

32 to 122° F (0 to 50° C)

Storage Temperature

-40 to +149° F (-40 to +65° C)

Relative Humidity

Up to 80%


13 H x 14 W x 10 D in. (330 H x 356 W x 254 D mm)


25 lb (11.3 kg)

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