AQ200 Series – AQ-G215 Generator Protection Relay

The AQ G215 generator protection relay is well suited for machines requiring complete generator protections. The AQ G215 is a cost effective synchronous protection relay.

It can be combined with AQ T216 to protect larger machines requiring differential protection and greater protection redundancy. The AQ G215 communicates using various protocols including IEC 61850 substation communication standard.
 

Key features of the AQ G215 Generator Protection Relay

Protection functions

• Three-phase overcurrent, 2 stages INST, DT or IDMT (50/51)
• Earth-fault (sensitive), 2 stages INST, DT or IDMT (50/51N)
• Harmonic overcurrent / inrush blocking, 4 stages INST, DT or IDMT (50/51H, 68)
• Current unbalance / broken conductor, 2 stages INST, DT or IDMT (46/46R/46L)
• High/low impedance restricted earth fault / cable end differential * (87N)
• Directional overcurrent, 4 stages INST, DT or IDMT (67)
• Directional (sensitive) earth-fault, 4 stages INST, DT or IDMT (67N)
• Overvoltage, 2 stages INST, DT or IDMT (59)
• Undervoltage, 2 stages INST, DT or IDMT (27)
• Zero sequence overvoltage, 2 stages INST, DT or IDMT (59N)
• Negative sequence overvoltage, 2 stages INST, DT or IDMT (59N/47)
• Over/under frequency, 4 stages INST or DT (81O/81U)
• Rate of change of frequency, 4 stages INST or DT or IDMT (81R)
• Voltage restrained overcurrent (51V)
• Over/Under/Reverse power (32/37/32R)
• Generator thermal overload (49G/49RTD)
• Breaker failure protection (50BF/52BF)
• Arc protection (option) (50ARC/50NARC)

Measuring and monitoring

• Phase and residual currents (IL1, IL2, IL3, I01, I02)
• Voltage measurements (UL1-UL3, U12-U31, U0, SS)
• Current and voltage THD and harmonics (up to 31st)
• Frequency (f)
• Power (P, Q, S, pf)
• Energy (E+, E-, Eq+, Eq-)
• Circuit breaker wear (CBW)
• Disturbance recorder (3.2 kHz)
• Current transformer supervision (CTS)
• Fuse failure (VTS)
• Trip circuit supervision (TCS)  (12 sensors +2xHSO +BI)

Hardware

• Current inputs: 5
• Voltage inputs: 4
• Digital inputs: 3 (standard)
• Output relays: 5+1 (standard)