Product Description
The GWZC-9821 Capacitor Protection Relay provides comprehensive protection for 6.6kV–33kV capacitor banks in substations and industrial power systems. Equipped with high-speed DSP processing and 16-bit precision sampling, it accurately detects faults while mitigating harmonic and inrush current impacts. Supports IEC 61850, DNP3.0, and Modbus protocols via dual Ethernet and RS-485 interfaces for seamless grid integration.
Product functionsANSI）：
1.Three-stage Phase Overcurrent Protection (with Voltage Blocking) ANSI 51P/27
①Instantaneous Overcurrent Protection (Stage I)（IEEE 50P/51P-1）
②Time-Delayed Overcurrent Protection (Stage II)（IEEE 51P-2）
③Backup Overcurrent Protection (Stage III)（IEEE 51P-3）
2.Inverse Time Phase Overcurrent Protection | ANSI 51I
3.Three-stage Zero-sequence Overcurrent Protection | ANSI 51N
4.Overload Protection | ANSI 49
5.Three-stage Low-side Zero-sequence Overcurrent Protection | ANSI 51N
6.Negative-sequence Overcurrent Protection | ANSI 46
7.Voltage Protection (Overvoltage, Zero-sequence Overvoltage, Undervoltage) | ANSI 59/27/59N
8.Control Circuit Failure Alarm | IEC 61850 ALM
9.PT (Potential Transformer) Failure Alarm |IEC 61850 ALM
10.Non-electrical Protection | IEC 61850 PTOF
11.PT Loss of Voltage (Alarm) | IEC 61850 ALM
System Power Loss (Alarm/Trip Option) | IEC 61850 ALM/PTOC
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)
