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Generator Protection Panel
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GWZC-9000 Generator protection panel​

Product Overview : The ​GWZC-9000 generator protection panel is mainly used for the control and protection of hydroelectric units, gas turbine units, biogas units, and large diesel generator sets.

Product functions(ANSI):87H | 87 | 87A | 49 | 50/51 | 51 | 49 | 46 | 50N/51N | 40 | 32 | 81O/81U | 59/27 | 59N | 64S | 60 | 27 | 27/81U | 74 | 50N/51N | 50G/51G

Product Components : GWZC-9884 Generator Differential Protection Relay | GWZC-9885 Generator Rotor Earth Fault Protection Relay | GWZC-9886 Generator Backup Protection Relay | Panel and accessories

GWZC-9801 Public Measurement and Control Device
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GWZC-9801 Public Measurement and Control Device

Product Overview : The ​GWZC-9801​ is a ​35kV/substation​ protection and control relay with ​measurement, switching, communication (IEC 61850/Modbus), and fault logging, used in ​switchgear and industrial power systems.

Product functions(ANSI):25 | 51N | 59N

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9790N Reverse Power Protection Relay
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GWZC-9790N Reverse Power Protection Relay (ANSI 32)

Product Overview : The ​GWZC-9790N​ reverse power relay detects and blocks reverse power flow in 6.6kV-33kV systems, with adjustable trip settings for generator and grid protection in switchgear applications.

Product functions(ANSI):50 | 51 | 49 | 50N/51N | 32 | 32R | 79 | 59 | 27 | 59N | 74

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9890J Fault Islanding Protection Device
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GWZC-9890J Fault Islanding Protection Device

Product Overview : GWZC-9890J​ is a fault disconnection relay for ​10-35kV grids, detecting and isolating faults (overcurrent, undervoltage, frequency issues) to prevent system failures.

Product functions(ANSI):59N | 27 | 59 | 81U | 81O | 78 | 60 | 94

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9886 Generator Backup Protection Relay
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GWZC-9886 Generator Backup Protection Relay

Product Overview : The ​GWZC-9886​ is a generator backup relay for 10kV–35kV systems, offering overcurrent, under/overvoltage, and reverse power protection. Installed in generator panels, it ensures fault backup security.

Product functions(ANSI):50/51 | 51 | 49 | 46 | 50N/51N | 40 | 32 | 81O/81U | 59/27 | 59N | 64S | 60 | 27 | 27/81U | 74

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9885 Generator Rotor Earth Fault Protection Relay
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GWZC-9885 Generator Rotor Earth Fault Protection Relay

Product Overview : GWZC-9885 Rotor Earth Fault Relay​ – Provides two-stage protection (alarm/trip) with insulation monitoring for generator rotors, preventing winding damage. Installed in protection/excitation panels.

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

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9884 Generator Differential Protection Relay
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GWZC-9884 Generator Differential Protection Relay(87H | 87 | 87A)

Product Overview : The ​GWZC-9884​ is a generator differential relay offering fast fault protection with harmonic restraint, ideal for power plants and industrial generators (6.6kV–24kV).

Product functions(ANSI):87H | 87 | 87A | 49

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9829 Main Transformer On-load Tap Changer Control Relay
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GWZC-9829 Main Transformer On-load Tap Changer Control Relay

Product Overview : The GWZC-9829 relay provides on-load tap changer control for 66kV/110kVpower transformers, enabling tap position monitoring and voltage regulation.

Product functions(ANSI):94 | 90

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9828 Transformer Non-Electrical Protection Relay
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GWZC-9828 Transformer Non-Electrical Protection Relay

Product Overview : Transformer Non-Electrical Protection Relay​ monitors oil temperature, gas, and pressure in transformers (35kV+). Installed on transformers or in control cabinets, it provides alarms/trips to prevent failures. Essential for substations and power plants, it complements electrical protection systems.

Product functions(ANSI):71G | 26/49 | 63 | 38

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

GWZC-9827 Transformer Backup Protection Relay
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GWZC-9827 Transformer Backup Protection Relay

Product Overview : GWZC-9827​ is a transformer backup protection relay for 66kV/33kV/11kV systems, providing overcurrent, earth fault and overload protection. Installed in switchgear, it offers secondary protection with IEC 61850/Modbus support.

Product functions(ANSI):50/51 | 51 | 50N/51N | 51N | 49 | 50G/51G | 38/74 | 59 | 59N | 27 | 74 | 60 | 27/81U | 27/81L | 30

Communication functions : IEC61850 | ​​IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485

Technical Knowledge More
Wireless Temperature Monitoring System for Substations
Wireless Temperature Monitoring System: Application in Switchgear​
This article introduces the application of wireless temperature monitoring systems in high-voltage and low-voltage switchgear. The configuration of the wireless temperature monitoring system varies across different equipment. If you need a customized wireless temperature monitoring solution for your project, please visit our website for more information.
2025/09/08
GWZC-9804 Arc Flash Protection Relay
Switchgear Arc Flash Protection System Configuration Scheme
This article introduces the configuration scheme for a switchgear arc flash protection system. Busbar arc flash protection monitors the busbar compartment and trips the incoming breaker, while feeder arc flash protection monitors the circuit breaker compartment and cable compartment to trip the feeder breaker. A proper arc flash protection system configuration scheme can effectively protect personnel and equipment safety. For information on a reliable arc flash protection system configuration scheme, please visit our website.
2025/09/04
Arc Flash Protection Relay
Arc Protection Working Principle and Decision Process
Arc Flash Protection is a specialized safety system engineered to rapidly detect and mitigate destructive electrical arc flash faults. Unlike conventional overcurrent protection, it utilizes a combination of light and current sensors to identify an arc flash event within milliseconds. By triggering a circuit breaker to isolate the fault incredibly fast, Arc Flash Protection significantly reduces the explosive energy released, safeguarding personnel from severe injury and preventing extensive damage to electrical equipment like switchgear. This makes it an indispensable defense layer in industrial, commercial, and utility power systems.
2025/09/03
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