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GWZC-9842 Capacitor switching relay
Capacitor switching relay  Side View
Capacitor switching relay  Rear View
GWZC-9842 Capacitor switching relay
Capacitor switching relay  Side View
Capacitor switching relay  Rear View
GWZC-9842 Capacitor switching relay

Applicable Scope:The ​GWZC-9842 Capacitor Switching Relay​ provides ​protection, control, and monitoring​ for capacitor banks in ​​≤110kV systems, featuring ​overcurrent, voltage, and unbalance protection. Installed in ​substations and industrial plants, it enables safe ​reactive power compensation​ in switchgear and control panels.

Product functions(ANSI):87H | 87 | 50/51 | 51 | 46 | 50N/51N | 59 | 27 | 47 | 74 | 74T | 30 | 25

Communication functions:Supported Protocols:​​IEC 60870-5-103 (over Ethernet) | MODBUS RTU (via RS-485) | IEC 61850 (Ed.2 or Ed.1, as applicable)
​Interfaces:​​2× Ethernet Ports​ (IEEE 802.3 compliant, 10/100 Mbps) | 2× RS-485 Ports​ (ANSI/TIA-485-A standard, galvanically isolated)

Other functions: Support time synchronization via communication message, SNTP (Simple Network Time Protocol) time synchronization, and IRIG-B time synchronization. Support the dot matrix printing function with serial port communication. Support the fault recording function

Product Introduction Technical Parameter Size

Product Introduction:
          The ​GWZC-9842 Capacitor Switching Relay​ is designed for ​automatic switching, protection, and monitoring​ of capacitor banks in ​110kV and below​ power systems. It provides ​overcurrent, over/undervoltage, and unbalance protection, along with measurement and remote control capabilities. Typically installed in ​substations, power plants, and industrial facilities, it ensures safe and efficient ​reactive power compensation​ in switchgear and capacitor control panels.

 

Product functionsANSI):

1.Instantaneous Differential Protection (ANSI 87H)
2.Percentage Differential Protection (ANSI 87)
3.Three-Step Phase Overcurrent Protection (ANSI 50/51)
4.Inverse Time Phase Overcurrent Protection (ANSI 51)
5.Unbalance Current Protection (ANSI 46)
6.Three-Step Zero-Sequence Overcurrent Protection (ANSI 50N/51N)
7.Overvoltage Protection (ANSI 59)
8.Undervoltage Protection (ANSI 27)
9.Unbalance Voltage Protection (ANSI 47)
10.Control Circuit Open Alarm (ANSI 74)
11.Transformer Open-Circuit Alarm (ANSI 74T)
12.Non-Electrical Protection (ANSI 30)
13.Capacitor Switching (ANSI 25)

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)

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GWZC-9842 Capacitor switching relay
Capacitor switching relay  Side View
Capacitor switching relay  Rear View
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