Functions
Protection and control
l Pilot distance protection. (85)
l Pilot zero sequence directional comparison protection. (85)
l Phase-to-phase distance protection. (21P)
l Phase-to-ground distance protection. (21G)
l Phase directional overcurrent protection. (67P)
l Phase overcurrent protection. (50P, 51P)
l Zero sequence directional overcurrent protection. (67G)
l Zero sequence overcurrent protection. (50G, 51G)
l Switch-onto-fault (SOTF) logic.
l Under frequency protection. (81)
l Under/over voltage protection. (27/59)
l Frequency rate-of-change element. (7F)
l Voltage rate-of-change element. (7V)
l Power swing blocking. (68)
l Accelerated tripping for Asymmetric faults.
l Accelerated tripping during double circuit line.
l Overload alarm function (Optional).
l Synchronism check. (25)
l Auto-reclosing (three-pole). (79)
Monitoring and Metering
l Auto-switching module for AC voltage
l Circuit breaker monitoring.
l CT failure detection logic.
l VT failure detection logic.
l Line voltage failure supervision.
l Operating circuit supervision.
l Voltage and current drift auto adjustment.
l Self diagnostic test.
l Fault Recorder.
l Fault Locator.
l GPS clock synchronization.
l 64 tripping reports, 64 alarm reports and 64 binary input status change reports.
l High resolution oscillography of last 24 oscillograms (Compatible with international COMTRADE format).
Communications
l Pilot communication schemes with fiber, carrier or other channels.
l 2 optional Ethernet ports with IEC 61850 or IEC 60870-5-103 over TCP/IP.
l 2 RS-485 communication rear ports conform to IEC 60870-5-103 protocol.
l 1 RS-485 communication rear ports for clock synchronization.
l 1 RS-232 communication rear ports or RS-485 for printer.
l 1 RS-232 communication faceplate port for testing and setting.
Features
l The relay integrates AC voltage auto-switching module. In the double-busbar scheme, when the transmission line is switched between the two busbars, the AC voltage inputs of the relay will be auto-switched according to the actual busbar VT based on the states of isolators.
l Unique accelerated trip for double-circuit line and accelerated trip for asymmetric fault can reduce the tripping time during double-circuit line fault and asymmetric fault. The two schemes guarantee a fast clearance time even without pilot protection.
l The built-in reliable power swing blocking logic can properly supervise the distance elements during a power swing. The power swing blocking logic can make the relay untrip for an external fault during a power swing and pickup for an internal fault.
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.