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.
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
SIGNAL VOLTAGE :
≤ 15 V RMS variable
SHORT CIRCUIT CURRENT :
< 2mA SIGNAL
≤ 12Hz selectable
FAULT RESISTANCE :
1 MΩ, 400 kΩ, 100 kΩ, 60 kΩ variants
SENSOR PROBE :
HIGH SENSE BIG PROBE – 55mm
HIGH SENSE SMALL PROBE – 18 mm
CONTROL: Fully automatic
CAPACITIVE BALANCING: Automatic
Storage : 0 ⁰ C To 55⁰ C
Operating : 0 ⁰ C To 55⁰ C
DIMENSIONS in mm :
Transmitter : 120x170x55
Receiver : 95x175x40
Transmitter : 0.5kg
Receiver : 0.2 K
Standard Accessories :
Note: Specification & design subject to change without prior notice
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