In recent years our company has successfully developed the numeric high impedance differential protection function, which provides protection solution for busbar, transformer, generator, reactor and motor applications where fast clearance of faults is required with high stability against external fault conditions and fast & reliable performance against internal faults.
In recent years our company has successfully developed the numeric high impedance differential protection function, which provides protection solution for busbar, transformer, generator, reactor and motor applications where fast clearance of faults is required with high stability against external fault conditions and fast & reliable performance against internal faults.
In recent years our company has successfully developed the numeric high impedance differential protection function, which provides protection solution for busbar, transformer, generator, reactor and motor applications where fast clearance of faults is required with high stability against external fault conditions and fast & reliable performance against internal faults.
In recent years our company has successfully developed the numeric high impedance differential protection function, which provides protection solution for busbar, transformer, generator, reactor and motor applications where fast clearance of faults is required with high stability against external fault conditions and fast & reliable performance against internal faults.
This operating principle requires stabilizing resistors (RST) in each phase and a non-linear resistor (MOV) is generally required across the relay circuit.
| This protection can also be widely used at neutral grounded star transformers, where high internal phase-to-ground fault detection sensitivity can be reached. It is also called as Restricted Earth Fault protection (87N). |  |
During internal faults the current transformers are quickly saturated, so the differential current can be highly distorted. Because of the current distortion, a special differential current measurement is required. Protecta uses special hardware solutions for the measurement:
More technical details can be found on the related product page:
https://www.protecta.hu/protecta_products/smartline/s24/variant-7
Protecta provides own‑developed protection, automation & control devices for power generation, transmission, distribution, industrial and renewable energy (microgrid) applications.
Késmárk u. 7/A, 1158 Budapest, Hungary +36 1 415 3800 protecta@protecta.hu Protecta LinkedIn
