Generator Rotor Earth Fault Protection Relay | Manufacturers Price Guide & Technical Specs

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GWZC-9885 Generator Rotor Earth Fault Protection Relay

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GWZC-9885 Generator Rotor Earth Fault Protection Relay

Applicable Scope ：The GWZC-9885 Generator Rotor Earth Fault Relay provides two-stage protection (alarm/trip) for rotor winding ground faults, monitors insulation resistance, and features self-diagnostics. Installed in generator protection or excitation panels, it safeguards power plant and industrial generators against rotor damage.

Product functions（ANSI）：50N/51N | 50G/51G

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-9885 Generator Rotor Earth Fault Protection Relay is designed to detect and protect against ground faults in generator rotor windings, offering two-stage protection with alarm and trip functions for both low and high-resistance faults.

GWZC-9885 Generator Rotor Earth Fault Protection Relay continuously monitors insulation resistance to detect early insulation degradation and includes self-testing for reliability.

GWZC-9885 Generator Rotor Earth Fault Protection Relay Typically installed in generator protection panels, excitation control cabinets, or substation relay panels, this relay is essential for synchronous generators in power plants and industrial applications, ensuring safe operation and preventing rotor damage.

Product functionsANSI）：

1.Single-Phase Ground Fault Protection (ANSI 50N/51N)
2.Double-Phase Ground Fault Protection (ANSI 50G/51G)

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