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Line protection relay related product

GWZC-9812 Distance protection relay
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GWZC-9812 Distance protection relay(21 | 21G | 21FL)

Product Overview : The ​GWZC-9812 Distance Protection Relay​ provides directional line protection (distance, current, voltage) and three-phase auto-reclosing for distribution systems below 35kV.

Product functions(ANSI):21 | 21G | 21FL | 68 | 50/51 | 50N/51N | 32 | 27 | 79 | 50HS/79 | 49 | 81U | 60FL

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

GWZC-9611 Feeder Protection Relay
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GWZC-9611 Feeder Protection Relay

Product Overview : GWZC-9611 Feeder Protection Relay​ Protects, controls (auto-reclosing), and monitors ​MV distribution feeders (11kV-33kV)​. Installed in ​substation/industrial feeder switchgear​ to safeguard outgoing circuits.

Product functions(ANSI):50 | 51 | 50N | 51N | 49 | 79 | 50 | 81U | 27 | 64

Communication functions : IEC61850(Optional) | ​​IEC 60870-5-103 | MODBUS RTU | 1× Ethernet Ports | 1× RS-485

GWZC-9913 FO Line Diff Relay(87L)
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GWZC-9913 FO Line Diff Relay(87L)

Product Overview : This FO Line Diff Relay protects 132kV and below transmission lines in ungrounded/low-resistance systems, offering primary/backup protection with monitoring. Supports switchgear/panel mounting via fiber channels with E1 interface.

Product functions(ANSI):87L |50/51 | 51 |50N/51N | 51N | 81U | 49 | 79 | 60 | 60 | 60 | 60/51 | 94 |21

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

GWZC-9916 Bus differential protection relay
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GWZC-9916 Bus differential protection relay

Product Overview : GWZC-9916 Bus Differential Protection Relay Applicable for voltage levels up to 132kV, supporting various busbar configurations including single bus, sectionalized single bus, triple-section single bus, double bus, double bus with single section, and double bus with double sections.

Product functions(ANSI):87 | 50BF | 50BF | 50 | 60 | 60 | 60 | 50 | 27

Communication functions : IEC61850 |​​IEC 60870-5-103 |MODBUS RTU |3× Ethernet Ports |3× RS-485

GWZC-9811C Line differential protection relay
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GWZC-9811C Line differential protection relay (87H | 87)

Product Overview : The GWZC-9811C line differential protection relay is specifically designed for power distribution systems up to 66kV, featuring pilot-wire differential protection technology for fast fault clearance.

Product functions(ANSI):87H | 87 | 87A | 50 | 51 | 51V | 49 | 46 | 50N/50G | 59 | 27 | 81 | 30

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

GWZC-9811  Line protection relay
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GWZC-9811 Line protection relay

Product Overview : GWZC-9811 Line Protection Relay is designed for the protection of 33kV & 66kV transmission lines and feeder circuits, featuring easy installation and simple commissioning.
Product functions(ANSI):51P/27 | 51I | 51N | 49 | 46 | 59/27/59N
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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