Product Introduction of Distance Protection Relay
The GWZC-9812 Distance Protection Relay is designed for comprehensive directional line protection, measurement, and control in electrical power systems with voltages below 35kV, specifically in non-directly grounded or resistance-grounded networks. This integrated device features core functions including distance, current, and voltage protection, as well as three-phase auto-reclosing as standard configurations.
The GWZC-9812 Distance Protection Relay is suitable for applications in substations, distribution stations, and industrial plants, providing reliable fault detection and system monitoring. The relay is typically installed locally in line switchgear cabinets for direct access or mounted in group panels within control rooms for centralized operations.
Product functions（ANSI）
1.Phase Distance Protection (3-Zone) (ANSI 21)
2.Ground Distance Protection (3-Zone) (ANSI 21G)
3.Fault Location (ANSI 21FL)
4.Asymmetrical Successive Trip Protection (ANSI 68)
5.Double-Circuit Successive Trip Protection (ANSI 68)
6.Phase Overcurrent Protection (3-Zone) (ANSI 50/51)
7.Zero-Sequence Overcurrent Protection (3-Zone) (ANSI 50N/51N)
8.Directional Blocking (ANSI 32)
9.Undervoltage Blocking (ANSI 27)
10.Automatic Reclosing (ANSI 79)
11.Reclosing Acceleration Protection (ANSI 50HS/79)
12.Overload Protection (ANSI 49)
13.Underfrequency Protection (ANSI 81U)
14.Undervoltage Protection (ANSI 27)
15.PT Fuse Failure Detection (ANSI 60FL)
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)
