When PRS-721 is mainly designed for protecting "T" zone of one and a half breakers arrangement. The device comprises of circulating current Protection and feeder line end fault protection.
This relay can sample the analog values from the traditional instrument transformers, or receive the sampled values from the electronic current and voltage transformers (via a merging unit). The binary inputs and outputs of this relay can be configured according to the demands of a practical engineering through the PRS IED Studio configuration tool auxiliary software, which can meet some special requirements of protection and control functions.
This relay can fully support the IEC61850 communication protocol and GOOSE function, and can completely meet the demands of a modern digitalized substation.It provides standard functions including breaker failure, voltage, overcurrent, stub protection, broken conductor check, and auto-reclosing for busbars from 1000kV to 110kV, with dedicated circulating current and feeder line end fault protection for the "T" zone in one-and-a-half breaker arrangements.
Supports analog acquisition from traditional transformers or sampled values from electronic transformers via merging units, compatible with standards like IEC60044-8 and IEC61850-9-2.
Adopts modular hardware design. Except for core modules like PWR, CPU, and HMI, other TF and IO modules can be flexibly configured and installed in remaining slots for easy expansion.
Its interlock logic function is programmable. Through the visual logic configuration tool, the interlock logic configuration files can be modified based on actual requirements to customize remote control and blocking functions.
Fully supports IEC 61850 communication protocol and GOOSE functions, meeting the demands of modern digital substations for seamless integration with station and process layer systems.
Features a 320×240 dot matrix LCD display, navigation keys, and configurable function keys for real-time monitoring of status, events, measurements, and modifying protection settings with ease.
Standard | IEC60225-1: 2009 |
Mounting Way | Flush mounted |
Merchanical size (width×high×deepth) | 260 mm*266 mm *217.7 mm |
Housing material | Metallic plates, parts and screws: Steel Plastic parts: Polycarbonate |
Protection class | Front side:IP40 (IP52 with seal strip) Rear side, connection terminals: IP20 Other Sides: IP40 |
Communication Ports | 3 Ethernet network 2 RS-485 serial ports |
Communication Protocol | IEC61850, IEC60870-5-103, DNP3.0 |
Time Synchronization | SNTP, lEEE 1588, pulse per second (PPS) and IRlG-B |
Function | Three Phase Directional Overcurrent Protection 67P(50/51P) Directional Earth Fault Overcurrent Protection 67N(50/51N) Directional Negative-sequence Overcurrent Protection 67I2 Breaker Failure Protection 50BF Thermal Overload Protection 49 Stub Differential Protection 87STB Circulating Current protection 87CCP Feeder Line End Fault Protection 51FLE Pole Discordance Protection 52PD Broken Conductor Protection 46BC Three Phase Overvoltage Protection 59P Residual Overvoltage protection 59N Three Phase Undervoltage Protection 27P Synchrocheck 25SYN Automatic Reclosure 79AR Fault Detector FD Current circuit supervision CTS Fuse failure supervision VTS |
