l Unrestraint current differential protection. (87UR)
l DPFC (Deviation Power Frequency Variation Component) current differential protection. (87DR)
l Percentage restraint current differential protection. (87PR)
l Zero sequence current differential protection. (87GR)
l Sensitive inter-turn fault protection. (32G, 21G)
l Two-level definite time and one-level inverse time overcurrent protection. (50P, 51P)
l Two-level zero sequence overcurrent protection. (50G, 51G)
l Two-level neutral overcurrent protection. (50N, 51N)
l Thermal overload protection. (49)
l Non-electrical quantity protection. (NE)
l Circuit breaker monitoring.
l CT failure detection logic.
l VT failure detection logic.
l Operating circuit supervision.
l Voltage and current drift auto adjustment.
l Self diagnostic test.
l Fault Recorder.
l GPS clock synchronization.
l 256 event reports.
l High resolution oscillography of last 24 oscillograms.
(Compatible with international COMTRADE format)
l Rear communication ports: Ethernet with IEC 61850 or 2 RS-485 with IEC 60870-5-103, 1 RS-485 for clock synchronization, 1 RS-485/232 for communication to printer.
l Front communication port: 1 RS-232 for testing and setting.
l Main and backup protections are integrated in one set of protection equipment. Protection information such as sampled data and binary inputs is shared by all elements.
l DPFC percentage differential protection is regardless of the load current and is sensitive to small internal fault current within the transformer. Its performance against current transformer saturation is also good.
l The patented adaptive floating threshold method is adopted, which is insensitive to system unbalance and disturbance. The measuring element can get both high security and high speed simultaneously.
l Innovative technology to prevent any undesired trip caused by any component failure is adopted. The relay has two independent data acquisition paths, one for a fault detector and the other for protection and its logic. Tripping outputs are supervised by the fault detector to prevent a mal-operation.
l The connector type can be selected as connectorized wiring connector and crimp terminal connector. The unique connectorized wiring connectors from the relay rear panel to the terminal blocks on the rack or cabinet makes the on-site commissioning and replacement much easier than when you do the commissioning using the traditional screw terminals on the rear panel.
l The relay provides GPS clock synchronization, including second pulse, minute pulse and software IRIG-B synchronization.
l The format of event report is compatible with international COMTRADE file.
l The relay is compatible with multiple protocols- IEC61850 and IEC 60870-5-103. It provides networking interface such as RS485, RS232 and Ethernet port.