Product Introduction:
The GWZC-9811C line differential protection relay is specifically designed for 66kV and below distribution networks, featuring pilot-wire based current differential protection that ensures rapid fault clearance to enhance power supply reliability. This relay is primarily installed in distribution substation switchgear cabinets and is suitable for critical feeders, industrial power lines, and ring main systems, providing both primary differential protection and backup overcurrent protection along with fault recording capabilities, while offering the advantages of simple wiring and cost-effective reliability.
Product functionsANSI）：
1.High-Speed Differential Protection (ANSI 87H)
2.Percentage Differential Protection (ANSI 87)
3.Differential Current Alarm (IEEE C37.2 Device 87A)
4.Instantaneous Overcurrent Protection (ANSI 50)
5.Time-Delayed Overcurrent Protection (ANSI 51)
6.Time-Delayed Overcurrent Protection (ANSI 51)
7.Inverse Time Overcurrent Protection (ANSI 51V)
8.Overload Protection (ANSI 49)
9.Negative Sequence Instantaneous Overcurrent Protection (ANSI 46)
10.Negative Sequence Time-Delayed Overcurrent Protection (ANSI 46)
11.Instantaneous Ground (Zero Sequence) Overcurrent Protection (ANSI 50N/50G)
12.Time-Delayed Ground (Zero Sequence) Overcurrent Protection (ANSI 51N/51G)
13.Time-Delayed Ground (Zero Sequence) Overcurrent Protection (ANSI 51N/51G)
14.Overvoltage Protection (ANSI 59)
15.Undervoltage Protection (ANSI 27)
16.Residual Overvoltage Protection (ANSI 59N)
17.Potential Transformer Fuse Failure / PT Supervision (IEEE C37.2 Device 60FL)
18.Potential Transformer Loss of Voltage (IEEE C37.2 Device 60FL)
19.Current Transformer Supervision (IEEE C37.2 Device 60CTS)
20.Control Circuit Supervision / Trip Circuit Supervision (IEEE C37.2 Device 74)
21.Loss of Mains / Underfrequency Protection (ANSI 81)
22.Non-Electrical Protection (ANSI 30)
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)
