Battery Ground Fault Locator: MGFL

Floating DC systems are the backbone of any substations. Malfunctioning of a DC system/non-availability of sound DC system can lead to a disaster in the substation and hence it is a necessity that the floating DC systems in the substations should be free from any fault.

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    Floating DC systems are the backbone of any substations. Malfunctioning of a DC system/non-availability of sound DC system can lead to a disaster in the substation and hence it is a necessity that the floating DC systems in the substations should be free from any fault. 

    The DC ground locator, MGFL, helps substation engineers in locating, tracing and pinpointing DC ground faults in any floating DC system of up to 300V DC in online and offline conditions. The MGFL is a portable lightweight instrument used to locate the ground faults in DC systems. It consists of a transmitter unit and a receiver unit. The transmitter is connected to a live/non-live floating system of up to 300V DC preferably on the DC bus. It then transmits low frequencies and low voltage signals in the DC system without affecting the sensitive operation of relays. The transmitted signal is then tracked by the receiver to locate the faulted feeder and tracks it up to the point of fault. The instrument balances the capacitance of the DC system to automatically detect any faults. The instrument incorporates advanced signal processing to eliminate noise in the DC system and is very sensitive to any ground faults. The instrument is fully automatic and detects earth faults/mixing of sources easily.


    Battery systems used in the protection devices are designed and operated as floating ground systems which means that there is no intentional connection to the ground from either the positive polarity or negative polarity of the DC system. Sometimes a very low resistance or solid path is established from one of the polarities of the DC system to the ground which can lead to a significant voltage drop that continuously drains the battery bank. The usual suspects for DC ground-faults include worn insulation, conductive dust, water, or other ‘soft grounds.’ Ground faults account for more than 85% of equipment short circuits and in 95% of the cases, it is caused by insulation deterioration on wires and cables. These DC earth faults need to be rectified timely to avoid unscheduled breakdown.

    Major Application  

    • Utility – DC system with faulty grounding 
    • Railway – signal, communication, and locomotive electric equipment.
    • Industrial facilities – electric safety equipment for general power distribution applications. 
    • Telecommunication


    • Locates & pinpoints DC ground fault in online and offline conditions
    • Incorporates fully automatic capacitive balancing
    • Highly immune to noise in the system
    • Extremely sensitive to the fault signal
    • Lightweight and user friendly


    POWER : 

    Transmitter : 

    Rechargeable Li-ion batteries that can be charged with a 5V charger 


    Rechargeable and site replaceable Li-ion batteries that can be charged with a 9V charger 


     ≤ 15 V RMS variable 


    < 2mA SIGNAL


     ≤ 12Hz selectable 


    1 MΩ, 400 kΩ, 100 kΩ, 60 kΩ variants 



    CONTROL: Fully automatic 



    Storage : 0 ⁰ C To 55⁰ C
    Operating : 0 ⁰ C To 55⁰ C 

    DIMENSIONS in mm : 

    Transmitter : 120x170x55
     Receiver : 95x175x40 

    WEIGHT :

     Transmitter : 0.5kg 
     Receiver : 0.2 K

    Standard Accessories :

    • Receiver unit
    • Transmitter unit
    • Test lead Set with crocodile clips Clamp 55 mm
    • Clamp 20 mm
    • Spare battery – 9V
    • Charger 9V – Receiver unit 
    • Charger 5V – Transmitter unit 
    • Instruction Manual

    Note: Specification & design subject to change without prior notice

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    Motwane products are highly reliable, built with great quality, and deliver accurate results.  We at BSES Rajdhani Power have been using Motwane products for many years, and continue to do so.

    Shailendra Saxena

    Additional VP Protection BSES Rajdhani Power Ltd.

    Motwane is the oldest and the most trusted company in electrical testing products and solutions also. Motwane is known for reliable and rugged products also, we have procured from them. And our organization has been using these products and have found them satisfactory in performance and services also.

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    Director Technical MSETCL

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