Detection

Directional overcurrent detection is used to protect multi-source feeders to distinguish between

Directional overcurrent detection is used to protect multi-source feeders to distinguish between faults in different directions. The device has three-phase and neutral overcurrent detection.

It ensures 90° quadrant coordination during phase directional polarization. Therefore, regardless of whether the system is in fault-free or faulted operation.

The selected polarization voltage should be reasonably constant regardless of whether the system is operating without or with faults.

Phase-directed overcurrent

Phase-directed detection requires the determination of whether the current flow in each phase is forward or reverse, depending on the connection of the phase sources, the selected MTA angle, and the voltage and current phases.

Features

The multimeter is a microprocessor-based intelligent electronic device (IED) for measuring current, voltage, power and energy.

Fault current detection and overcurrent indication are also provided.

The current and voltage inputs are connected via transformers only (see Wiring). The modules support configurations with 3 or 4 voltage transformers and 3 or 4 current transformers.

The calculated values are scaled according to the constants programmed by the user for the current and voltage transformers. All values are updated after 200 ms.

Fault current can be measured up to 20 times the rated current.

The current input can withstand 50 times the rated current for 1 second.

The multimeter is equipped with two binary outputs, which are not supported in the RTU500 series configuration.