RFL products

The GARD Pro® Digital Teleprotection system is a versatile product with extensive digital Time Division Multiplexed (TDM) communications capabilities for use in a wide range of power system protection applications. The system is designed for protective relaying applications, requiring high-speed reliable digital communications. The GARD Pro® can be programmed for various protection schemes including Directional Comparison Blocking (DCB), Direct Transfer Trip (DTT), Permissive Transfer Trip (PTT), or phase comparison applications. The base system supports four 64 kbps digital teleprotection channels, each consisting of eight bi-directional functions, for a total of 32 functions. Additional channels can also be added as necessary. These channels may be assigned to one of up to eight various digital communications interfaces per system.

The GARD Pro® Single Function PLC channel is a product that can be programmed as Frequency-Shift Keyed (FSK) power line carrier system or as an amplitude-modulated ON/OFF powerline carrier terminal. The unit is designed for pilot protection relaying applications, requiring high-speed reliable communications. The GARD Pro® can be programmed for On/Off type directional comparison blocking (DCB), direct transfer trip, (DTT) Unblocking (DCU), permissive (PTT), or either single- or dual-phase comparison applications. The extensive sequence of events and diagnostic features provide information for the GARD Pro® and integrated PLC modules. The chassis is available in both a 3U version which can support one PLC system, or a 6U version which can support up to four PLC systems. The unit is available with front panel direct reading (in dB) digital meter to indicate receive signal strength. Each unit also comes with an external carrier level indicator output for use with external measuring devices such as a panel meter or an analog RTU input. Now supports DNP3 and SNMP remote management protocols for integration with management systems.