Intertie Protection M‑3520 Integrated Protection System®
• Integrated Protection System for DER Intertie, providing:
Loss of parallel utility operation protections
Abnormal power flow protections
Comprehensive suite of phase and ground
fault backed protections
Abnormal operating protections
Reconnect and Sync Check functions

• Microprocessor-based Intertie Protection Relay integrates
protection, metering, monitoring and waveform capture
• Provides 18 base protective relay functions and
3 optional protective functions
• Local and remote serial communications capabilities, plus
IRIG-B interface
Standard Functions
• Sync check with Phase, ∆V and ∆F with deadline/deadbus options (25)
• Phase undervoltage (27) protection
• Neutral over/undervoltage (59G/27G) protection
• Sensitive dual-setpoint, reverse power detection (32)
• Sensitive negative-sequence overcurrent protection and alarm (46)
• Negative sequence voltage (47)
• Instantaneous overcurrent (50) protection
• Instantaneous neutral overcurrent (50G) protection
• Three-phase inverse time overcurrent (51V) with voltage control/voltage restraint
• Neutral inverse time overcurrent (51G) protection
• Phase overvoltage (59) protection
• Peak overvoltage (59I) protection
• VT fuse-loss detection and blocking (60FL)
• Directional inverse and definite time phase overcurrent (67)
• Directional inverse and definite time neutral overcurrent (67N)
• Reconnect enable (79)
• Over/Underfrequency (81 O/U)
Optional Functions
• Dual-zone phase distance protection for phase fault backup (21)
• Out of Step (78)
• Rate of change of frequency (81R)
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