GFP - Grand Fault Protection

GFP (Ground Fault Protection) encompasses an entire family of ground fault protection devices designed to safeguard DC electric traction power systems with voltages ranging from 600V to 3000V. GFP system protections are used in traction substations, sectioning cabins, and repair halls where both poles are isolated from the ground.

The primary functions of the GFP protection include:

• Continuous monitoring of voltage exceeding safe levels on enclosures.
• Grounding of the earthed pole (MIN or PLUS) to the grounding installation (GND) via rapid activation of a grounding switch.
• Protection against stray currents by monitoring various parameters that define the state of the return network, including the voltage between the earthed pole and the grounding installation (UBU-UZM), current flowing through the grounding switch after its activation due to excessive UBU-GND voltage, the number of switch activations, and the switch's condition.
• Protection against the consequences of return cable interruptions.
• Protection against electric shock.
• Converting a ground fault in DC circuits into a two-pole short circuit, which is interrupted by primary protections or by the GFP protection in the substation (or cabin).
• Protection against the effects of faults in 110kV circuits.
• Protection of railway substations powered by 110kV voltage or located near 110kV/SN transformer stations.

Before selecting the appropriate type of GFP protection (substation, cabin, network type, polarity, location, etc.), please contact our design department.