Distance Protection GRZ100

GRZ100 is a full-scheme, high-speed, numerical distance relay for application to transmission lines in solidly earthed networks. This well-proven product provides extremely high performance through its advanced numeric design, with full-scheme, phase-selective distance protection giving typically one-cycle operating times. Command protection schemes, back-up overcurrent, switch-on-to-fault and stub protections, out-of-step tripping and circuit breaker fail protection complete a powerful protection package.

1. Time-stepped distance protection

2. Zone 1 extension protection

3. Distance protection using telecommunication
   - Permissive Underreach Protection (PUP)
   - Permissive Overreach Protection (POP)
   - Unblocking Overreach Protection (UOP)
   - Blocking Overreach Protection (BOP)

4. Directional earth fault protection using telecommunication

5. Switch-on-to-fault (SOTF) and stub protection

6. Broken conductor detection

7. Breaker failure protection

8. Out-of-step trip protection

9. Power swing blocking

10. High-resistance earth fault protection

11. Inverse-time overcurrent protection

12. Definite-time overcurrent protection

1. Metering
   - Power system voltages, currents, power, frequency

2. Recording
   - Event record
   - Fault record
   - Disturbance record

3. Directional earth fault protection using telecommunication

4. Calendar and Time
   - IRIG-B port for external clock

1. Single-shot autoreclose
   - single-phase / three-phase / single- and three-phase autoreclose

2. Multi-shot autoreclose
   - three-phase autoreclose

1. Liquid Crystal Display (LCD) display with operation keys
   - Relay setting and data display

2. Personal computer (PC) interface
   - Relay setting
   - Recorded data display
   - Waveform analyzing

1. Automatic monitor

2. Periodic signal channel test (BOP scheme)

1. Serial redundancy for tripping