Battery Ground-Fault Locator

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					                                                                                                            BATTERY TEST EQUIPMENT


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                                                                                               MULTI-AMP
                                                                                               Model BGL                                  2

                                                                                               • Locates ground faults on                 3
                                                                                                 floating battery systems

                                                                                               • Operates on live                         4
                                                                                                 battery systems
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                                                                                               • Multiple fault detection
                                                                                                 and tracking
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                                                                                               • Automatic operation

                                                                                               • Battery operated                         7

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Battery Ground-Fault Locator                                                                                                              9


DESCRIPTION                                 The BGL operates on battery systems              This method allows the instrument to
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The Multi-Amp® Battery Ground-Fault         that are either floating or grounded             effectively eliminate the effects of
Locator (BGL) simplifies the tracking of    through a resistor. Operators can determine      charging current due to capacitance on
ground faults on floating dc-powered        both the direction and magnitude of faults,      the battery system or surge suppression      11
control systems.                            allowing them to ignore high-impedance           capacitors that may be installed on the
                                            faults and concentrate on serious faults.        system.
It features automatic operation, can be                                                                                                   12
used on live battery systems and has the    The BGL is designed to work on battery           The wide dynamic range of the
unique capability of detecting, tracking    systems up to 260 volts dc. The instrument       instrument allows the operator to
and locating multiple faults on a battery   even operates in the presence of surge-          simultaneously track two or more ground
                                            suppression capacitors, effectively ignoring     faults that may be different in value. The   13
system without having to resort to
sectionalizing.                             them. It is only sensitive to the power          injected signal is low enough in
                                            dissipated in the grounding resistance,          amplitude that it should not interfere
This is accomplished by injecting a low-    hence the resistive paths to ground.             with the operation of relays, even of the    14
amplitude 25 Hertz test signal on either                                                     sensitive variety, under normal operation.
the positive or negative side of the        An additional feature of the BGL is its
power bus and tracking the signal with      ability to measure battery system total
                                            capacitance to ground, or the capaci-            FEATURES AND BENEFITS                        15
one of several available clamp-on
sensor probes.                              tors of any branch of the system. This           • Reads resistance directly (1 ohm
                                            allows the operator to determine the             to 100 kilohms)
A fault simulator also is provided with     maximum practical fault-resistance               • Locates single or multiple ground
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the instrument, allowing the periodic       range and provides the user with infor-
verification of the resistance and ca-                                                       faults
                                            mation on the battery system.
pacitance ranges of the BGL.                                                                 • Operates on floating or resistance-        17
                                            PRINCIPLE OF OPERATION                           grounded battery systems
APPLICATIONS                                                                                 • Operates on live battery systems
                                            The instrument operates by injecting a
The BGL allows tracking and locating of     25 Hertz signal between the battery                                                           18
ground faults on live or dead battery                                                        • Operates in the presence of surge-
                                            system and the ground. The resulting             correction capacitors
systems. Its locating ability is only       current is tracked by a clamp-on current
limited by the accessibility of the         probe. The magnitude of the injected signal is   • Fused output leads for maximum             19
battery cable.                              only 3.5 volts and will not cause any inter-     user safety
The instrument can make measure-            ference with the operation of sensitive          • Battery operated with internal
ments in the presence of dc current (up     protective relays on the system.                 automatic charger                            20
to 20 amperes) and ac ripple (charging      The instrument’s circuitry measures the          • Measures capacitance
current up to 0.5 ampere).                  25 Hertz power dissipated in the grounding       • Lightweight and portable
The BGL is useful for locating grounds on   resistance and calculates the value of                                                        21
any type of battery system, including       the grounding resistance from knowledge          • Tough polyethylene plastic sealed
those in refineries, mines and utilities    of the applied voltage.                          enclosure that provides high shock
as well as UPS and continuous process                                                        and vibration resistance                     22
systems.




AC-4 AVO-651 07.97
                                                                                                     AVO INTERNATIONAL            4-11
     BATTERY TEST EQUIPMENT

 1   SPECIFICATIONS                                             Environmental                                      Dimensions
     Input (specify one)                                        Operating Temperature                              13 H x 14 W x 10 D in.
                                                                  32 to 122° F (0 to 50° C)                        330 H x 356 W x 254 D mm
     120 V, 60 Hz, 30 VA
 2             OR                                               Storage Temperature                                Weight
     240 V, 50 Hz, 30 VA                                           -40 to +149° F (-40 to +65° C)
                                                                                                                   25 lb (11.3 kg)
                                                                Relative Humidity: Up to 80%
 3   Battery
     Lead-acid rechargeable

 4   Resistance Range
     1 Ω to 100 kΩ

 5   Capacitance Range
     1 to 100 µF

 6   Accuracy
     ±20%

     Injected Signal
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     25 Hz nominal, 3.5 V rms maximum,
     110 mA maximum
 8   Maximum Ripple Current
     0.5 A (ac)
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11                                                              The BGL with clamp-on current sensor and fault simulator


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                                                                    ORDERING INFORMATION
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       Item (Qty)                                                            Cat. No.       Item                                                 Cat. No.
       Battery Ground-Fault Locator                                                         Optional Accessories
19       120 volt, 60 Hz ....................................................... 835140     Mini clamp-on current sensor, 0.5 in. (127 mm)
         240 volt, 50 Hz .................................................... 835140-1        opening – maximum dc current: 5 A ................... 835146
20     Included Accessories                                                                 Busbar clamp-on sensor, 2 x 4 in. (50 x 101 mm)
       Clamp-on current sensor, 33 ft (10 m), 2 in. (50 mm)                                   opening – maximum dc current: 50 A ................. 835147
          opening – maximum dc current: 20 A [1] ........... 835142
21     Fault simulator [1] .................................................... 835145
       Output lead extension, 14.9 ft (4.5 m) [1] .............. 835144
       Output lead, 6.6 ft (2 m) [1] ..................................... 835143
22     Power cord, ac ............................................................. 17032
       Instruction manual [1] ................................... AVTM835140



                                                                                                                                                AC-4 AVO-651 07.97
     4-12    AVO INTERNATIONAL