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Generator Protection Panel
Generator Protection Panel
GWZC-9000 Generator protection panel​

Applicable Scope :The ​GWZC-9000 generator protection panel is primarily designed for the control and protection of hydroelectric units, gas turbine units, biogas units, and large diesel generator sets. Integrating protection, measurement, and communication functions, it enables comprehensive protection and control of various generator units, facilitating reduced or unattended operation.

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

Communication protocols : ​IEC 60870-5-101/103/104 ,IEC 61850(MMS/GOOSE/SV), Modbus RTU​ & ​Modbus TCP​,RJ-45 , RS-485

Product Introduction Technical Parameter Size

Generator Protection Panel Overview

          The generator protection panel integrates generator protection devices within a centralized control cabinet. It serves to control and protect high/low-voltage systems, generator sets, paralleling cabinets, and grid-tie cabinets.
Key components include:
          GWZC-9884 Generator Differential Protection Relay
          GWZC-9885 Generator Rotor Earth Fault Protection Relay
          GWZC-9886 Generator Backup Protection Relay
          Generator Measurement and Control Device
          Cabinets (2260 * 800 * 600 or Customizable) with accessories

Generator Protection Panel Functions (ANSI) :

          GWZC-9884 Generator Differential Protection Relay : Detects internal stator winding short circuits by comparing current differences at both ends of the generator, enabling rapid fault clearance (Core principle: Kirchhoff’s Current Law).(87H | 87 | 87A )

          GWZC-9885 Generator Rotor Earth Fault Protection Relay: Identifies insulation failures to ground in stator or rotor windings to prevent leakage currents or arc hazards (Utilizing fundamental/3rd harmonic principles, etc.). (50N/51N)

          GWZC-9886 Generator Backup Protection Relay: Acts as a secondary defense when primary protection fails or fault coverage expands, operating with time delay (e.g., overcurrent, impedance protection).(49 | 50/51 | 51 | 49 | 46 | 50N/51N | 40 | 32 | 81O/81U | 59/27 | 59N | 64S | 60 | 27 | 27/81U | 74 )

          Measurement & Control Device: Monitors real-time parameters like voltage, current, and power while executing remote commands (e.g., synchronization, load adjustment).

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Technical Knowledge More
Automatic Transfer Switch (ATS) Side View
What is Parallel Operation
​Parallel operation​ involves connecting two or more independent AC power sources (e.g., generators, grids) to share electrical loads seamlessly. This process—synchronization—demands precise matching of voltage magnitude, frequency, and phase angles between systems before interconnection. Critical for grid expansion, backup power, and renewable integration, it enables redundant supply during failures.
2025/08/15
Generator-Transformer Differential Protection Relay Rear View
Ring-Closing Operation: Definition & Importance in Power Grids
A ring-closing operation involves closing a normally open switch within a closed-loop electrical network fed by a single power source. This creates parallel paths to redistribute loads without interruption, primarily for maintenance or network reconfiguration. Key prerequisites are voltage difference under 5%, phase angle alignment below 5 degrees, and pre-calculation of induced circulating currents to avoid equipment damage. Distinct from connecting independent systems, this procedure requires advanced monitoring but avoids synchronization complexity. Strict protocols using real-time sensors and simulations ensure safe execution, making it fundamental for resilient distribution networks like ring-main units (RMUs) in urban grids.
2025/08/14
Synchronism Check Function vs. Synchronizing Function: Roles, Differences, and Applications
This article compares the ​synchronism check function​ in line protection devices and the ​synchronizing function​ in dedicated synchronizing equipment. The ​synchronism check function​ serves as a safety interlock for circuit breaker closing operations, while the ​synchronizing function​ enables precise generator synchronization and critical tie-line interconnections with active parameter regulation. Explore core principles, application scenarios, and technical distinctions between these critical power system components.
2025/08/11
Generator Protection Panel
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