Product Description​
           The ​GWZC-9841 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.Phase Time-Overcurrent Protection (Stage I/II/III) | ANSI 51P/67P
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 Overcurrent Protection | ANSI 51PI

3.Current Unbalance Protection | ANSI 46

4.Residual Time-Overcurrent Protection (Stage I/II/III) | ANSI 51N/67N

5.Overvoltage / Undervoltage Protection | ANSI 59 / ANSI 27

6.Voltage Unbalance Protection | ANSI 47

7.Control Circuit Supervision | ANSI 74

8.VT Supervision / Fuse Failure Monitor | IEC 61850: RTPD

9.Non-Electrical Protection
①Buchholz Protection (ANSI 63)
②Thermal Protection (ANSI 49/38)

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)