Product Introduction :
The GWZC-9886 Generator Backup Protection Relay is a critical protection device designed for medium to large generators (10kV–35kV) in power plants, hydro stations, and industrial cogeneration systems. It provides backup protection against faults such as overcurrent, under/overvoltage, reverse power, and negative sequence currents, while also monitoring key parameters like voltage, current, power, and frequency.
GWZC-9886 Generator Backup Protection Relay typically installed in generator protection panels or switchgear cabinets alongside primary relays, the GWZC-9866 ensures redundancy and safeguards generators during grid disturbances, internal faults, or abnormal operating conditions, enhancing overall system reliability.
Product functionsANSI）：
1.Three-Step Overcurrent Protection with Voltage Restraint and Memory Overcurrent (ANSI 50/51)
2.Inverse Time Overcurrent Protection (ANSI 51)
3.Overload Protection (ANSI 49)
4.Negative Sequence Overcurrent Protection (ANSI 46)
5.Inverse Time Negative Sequence Overcurrent Protection (ANSI 46)
6.Zero Sequence Overcurrent Protection (ANSI 50N/51N)
7.Loss of Excitation Protection (ANSI 40)
8.Reverse Power Protection (ANSI 32)
9.Frequency Protection (Overfrequency/Underfrequency) (ANSI 81O/81U)
10.Voltage Protection (Overvoltage/Undervoltage) (ANSI 59/27)
11.Zero Sequence Overvoltage Protection (Neutral Point Zero Sequence) (ANSI 59N)
12.Third Harmonic Voltage Stator Ground Protection (ANSI 64S)
13.Potential Transformer (PT) Open-Circuit Alarm (ANSI 60)
14.Potential Transformer (PT) Loss of Voltage Alarm (ANSI 27)
15.System Power Loss (Alarm/Trip Optional) (ANSI 27/81U)
16.Control Circuit Open-Circuit Alarm (ANSI 74)
Electrical Specifications
Power Supply:
● AC: 85-264V, 47-63Hz (≤15% THD)
● DC: 100-370V (≤5% ripple)
Rated AC Parameters:
● Voltage: 100V/√3 or 100V
● Current: 5A/1A
● Frequency: 50Hz
Overload Capacity:
● Current Circuit: 2×In continuous | 10×In (10s) | 40×In (1s)
● Voltage Circuit: 1.5×Un continuous
Power Consumption:
● Supply: <10W (static), ≤15W (trip)
● Current Circuit: ≤1VA/phase (5A) / ≤0.5VA/phase (1A)
● Voltage Circuit: ≤0.5VA/phase
Digital Output:
● Dry contact (8A@250VAC / 30VDC)
● Dielectric: 4kVAC (coil-contact), 1kVAC (open contact)
● Operating Time: 5ms (typ) / 8ms (max)
● Mechanical Life: 100k operations
Protection Performance
Operating Range:
● Voltage: 0.5-120V (phase)
● Current: 0.02-20×In
● Zero-Seq Current: 0.05-20A
● Frequency: 35-65Hz | Delay: 0-100s
Accuracy:
● Voltage/Current: ±2.5% or ±0.1V/±0.05A (whichever greater)
● Frequency: ±0.01Hz
● Settings: ±2.5%
Trip Time:
● Instantaneous: ≤35ms (≥1.2× setting)
● Time-Delayed: ≤1% of setting or 35ms
Measurement & Monitoring
Range:
● Voltage: 0.5-120V | Current: 0.02-1.2×In
Accuracy:
● V/I: ±0.2% | Frequency: ±0.01Hz | Other: 0.5%
● Time Sync: ≤2ms | SOE: ≤1ms
Event Recording:
● 128 protection trips/operations
● 32 self-tests/fault waveforms (COMTRADE)
Environmental & Mechanical
Operating Temp:
● Standard: -10°C to +55°C
● Extended: -40°C to +70°C*
Storage Temp: -40°C to +80°C
Humidity: 5-90% RH (non-condensing)
Pressure: 60-110 kPa
Compliance:
● IEC 60255-21 (vibration/shock)
● IEC 61000-6 (EMC)
