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Transformer protection relay related product

GWZC-9887 Generator-Transformer Differential Protection Relay
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GWZC-9887 Generator-Transformer Differential Protection Relay (87G|87T)

Product Overview: GWZC-9887 Generator-Transformer Differential Protection Relay provides complete differential protection for generator-transformer units. Features percentage differential protection, harmonic restraint, and IEC61850 communication support. Installs in switchgear panels for medium-small generator-transformer protection.

Product functions(ANSI):87H | 87 | 87A | 87B | 71M | 71T | 38 | 49 | 71O | 63PR | 27/81U | 40

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

GWZC-9621 Distribution transformer protection relay
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GWZC-9621 Distribution transformer protection relay

Product Overview : GWZC-9621 GWZC-9621​ Distribution transformer protection relay safeguards ≤1600kVA station/grounding transformers (≤35kV) with integrated monitoring, designed for LV switchgear.

Product functions(ANSI):50/51/27 | 51 | 46 | 50G/51G | 49 | 59 | 27 | 74

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

GWZC-9821C Transformer Differential Protection Relay
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GWZC-9821C Transformer Differential Protection Relay (87H | 87 | 87AL)

Product Overview: The ​GWZC-9821C​ is a transformer differential relay that detects internal faults while preventing inrush false trips. Installed in substation panels, it provides reliable protection for power transformers in utility/industrial systems.

Product functions(ANSI):87H | 87 | 87AL | 50/51 | 51V | 49 | 46 | 46 | 50N/51N | 51N | 59 | 27 | 59N | 60FL | 60 | 60CT | 74 | 27D | 30

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

GWZC-9821 Transformer protection relay
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GWZC-9821 Transformer protection relay

Product Overview : GWZC-9821 Transformer Protection Relay Specifically designed for power transformers, this device is installed in switchgear cabinets of substations and industrial power distribution systems to ensure safe and reliable operation of transformers.
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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