Product Introduction



       The GWZC-9581 low-voltage generator protection relay is primarily designed for the protection of 400V low-voltage generators below 1000kW, serving as a comprehensive and practical backup protection solution. With its compact and aesthetically pleasing design, along with reliable quality, this

generator protection relay

is the most ideal choice for low-voltage generator sets.

Protection Functions(ANSI)



       Phase Time Overcurrent Protection (ANSI 50/51)

       Inverse Time Overcurrent Protection (ANSI 51)

       Overload Protection (ANSI 49)

       Zero-Sequence / Ground Overcurrent Protection (ANSI 50N/51N)

       Overvoltage Protection (ANSI 59)

       Undervoltage Protection (ANSI 27)

       Overfrequency Protection (ANSI 81O)

       Underfrequency Protection (ANSI 81U)

       Reverse Power Protection (ANSI 32)

       CT Circuit Failure Protection (ANSI 74C)

       PT Circuit Failure Protection (ANSI 74V)

       Control Circuit Failure Protection (ANSI 74)

       System Supply Loss Protection (ANSI 27)

       Non-Electrical Protection (ANSI 30)

Monitoring and Control Functions



       Voltage: Ua, Ub, Uc, Uab, Ubc, Uca

       Current: Ia, Ib, Ic, Ia, Ib, Ic, 3I0

       Power Parameters: P (Active Power), Q (Reactive Power), S (Apparent Power), Cosφ (Power Factor)

Frequency: f


       Electrical Energy:

       EP+ (Active Energy Import)

       EP- (Active Energy Export)

       EQ+ (Reactive Energy Import)

       EQ- (Reactive Energy Export)

       14-channel Binary Input (Status Input) Acquisition

       8-channel Relay Output

       Event Sequence of Events (SOE) Recording

Communication Function

Communication Interfaces:

       2 Ethernet ports (Supporting IEC 60870-5-103 protocol, configurable option).

       1 RS485 communication port (Supporting Modbus-RTU protocol).

Time Synchronization Function:

       Supports time synchronization via communication messages, SNTP, and IRIG-B code.