Siemens Transient ground fault function

Siemens Transient ground fault function : The high sampling rate of SIPROTEC 5 devices allows for the integration of new, sensitive digital procedures for the reliable detection of high-impedance ground faults.

Features

The parts of the signal which are caused by the discharging and charging of the ground capacitances of the grid are of particular interest here. The active power in the zero-sequence system is a good criterion to detect the direction of the ground fault. As the charging takes place over a longer period of time with high-impedance ground faults, this part of the active power is available during this time period and can be integrated right from the ignition of the fault. This results in the active energy in the zero-sequence system.

Radial systems do not pose a problem for determining the direction. In meshed systems, operational zero-sequence currents can falsify the resulting direction. These operational zero-sequence currents are eliminated by the new algorithm in order to determine the correct direction.

Siemens Transient ground fault function : Benefits

• Enhances availability, conserves equipment
• Cost savings thanks to integration in SIPROTEC 5
• Very high sensitivity – detection of high impedance faults with fault resistances of up to 5 kOhms
• Detection of very short ground faults of few milliseconds
• Ideally suited for closed loops or meshed systems, as not impacted by operational zero-sequence currents
• Easy setup of the function

The protection, control, monitoring and measuring of our power networks is a vital element in managing our electrical assets, increasing reliability, sustainability and the safety of operating personnel. Our goal is to provide protection devices which provide flexible solutions and easy integration into an energy market which is becoming increasingly decentralized and digitalized. With the new Siemens Transient ground fault function we have listened to the changing needs of our customers.

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