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GWZW-9883  Generator Comprehensive Protection Relay
Generator Comprehensive Protection Relay Side View
Generator Comprehensive Protection Relay Rear View
GWZW-9883  Generator Comprehensive Protection Relay
Generator Comprehensive Protection Relay Side View
Generator Comprehensive Protection Relay Rear View
GWZW-9883 Generator Comprehensive Protection Relay

Applicable Scope:The VIP-96S88C is a generator comprehensive protection relay that integrates differential protection and backup protection. Designed for protection and control of small to medium-sized hydro generators and steam turbine generators, it ensures reliable operation and equipment safety.

Product functions(ANSl):87G;60FL;50;50N;51;51N;51AC;40;49;46;46IT;58/59N;60FL;74;81L/81R

Communication functions: include the Ethernet 103 protocol and MODBUS RTU protocol, featuring 2 Ethernet ports and 2 RS485 communication interfaces.

Product Introduction Technical Parameter Size
Product Introduction:
        This is a versatile generator protection relay integrating differential protection, grounding protection, and backup protection. It not only provides comprehensive protection functions with precise and reliable sampling but also features multiple communication interfaces, including RS-485, IEC 103 Ethernet communication, and fiber optic communication. It is the optimal choice for small-capacity generator sets.
       For large-capacity generator protection, you may opt for our GWZC-9884 Generator Differential Protection Relay, GWZC-9885 Generator Rotor Ground Fault Protection Relay, and GWZC-9886 Generator Backup Protection Relay to form a complete generator protection system.
 

Product Functions:

1.Generator Differential Instantaneous Trip Protection (Trip) (ANSI 87G)
2.Generator ratio restraint longitudinal differential protection (Trip) (ANSI 87G)
3.Current Transformer Secondary Circuit Open(CT Open Circuit ) ​ (Alarm) (ANSI 60FL)
4.Differential Current Overthreshold Alarm (Alarm)
5.Instantaneous Overcurrent Protection (Trip) (ANSI 50)
      Voltage-Controlled Instantaneous OC Protection (ANSI 50V )
6.Time – limited Instantaneous Overcurrent Protection (Trip) (ANSI 50)
      Voltage-Restrained Time-Delayed Overcurrent Protection (ANSI 51V )
7.Definite – Time Overcurrent Protection (ANSI 51) (Trip)
      Voltage-Controlled Definite-Time Overcurrent Protection (ANSI 51V )
8.Inverse-Time Overcurrent Protection (ANSI 51AC) (Trip)
      Voltage-Restrained Inverse-Time OC Protection (ANSI 51V )
9.Overload Protection (Alarm/Trip) (ANSI 49)
10.Negative Sequence Instantaneous Overcurrent Protection (Trip)(ANSI 46)
11.Negative Sequence Inverse-Time Overcurrent Protection (Trip)(ANSI 46IT)
12.Negative Sequence Inverse-Time Overcurrent Protection (Trip)(ANSI 46IT)
13.Instantaneous Zero-Sequence Overcurrent Protection (Trip) (ANSI: 50N)
      Zero-Sequence Under-Voltage Blocked Instantaneous Zero-Sequence Overcurrent Protection(ANSI:50NZ)
14.Zero-Sequence Time-Limited Overcurrent Protection (Trip) (ANSI: 51N)
      Zero-Sequence Under-Voltage Blocked Definite-Time Zero-Sequence Overcurrent Protection(ANSI:51NZ)
15.Time – limited Zero-Sequence Overcurrent Protection (Trip) (ANSI: 51N)
16.Loss of Field Protection (LOF) (Trip) (ANSI: 40)
17.Overfrequency Protection (Trip) (ANS:81H)
18.Under – frequency Protection (Trip) (ANS:81L)
19.Overvoltage Protection (Trip) (ANSI:59)
20.Undervoltage Protection (Alarm/Trip) (ANSI:27)
      Undervoltage Protection with Current Blocking Logic (ANSI:27 + 50 Blocking)
21.Zero – sequence Overvoltage Protection (Alarm/Trip) (ANS:59N)
22.otential Transformer (PT) Fuse Failure Alarm (Alarm) (ANS:60FL)
23.PT Loss of Voltage Alarm (Alarm)
24.Control Circuit Supervision  (Alarm) (ANSI 74)
25.Loss of Mains Protection (LoM)  (Alarm/Trip) (ANSI 27+81R+32)
26.Non-Electrical Protection (Alarm/Trip)

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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
GWZW-9883  Generator Comprehensive Protection Relay
Generator Comprehensive Protection Relay Side View
Generator Comprehensive Protection Relay Rear View
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