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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

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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