I. Product Basic Information

Model: 1240-006-A2 / 12400006A2

Alternative Names: VDN Voltage Divider Network, Voltage Divider Network Calibration Board, SPM Relay Protection Calibration Board

Compatible Models: GE Multilin SPM Synchronous Motor Integrated Protection Relay (Synchronous Motor Protection), SPM Complete Set Standard Voltage Sampling Calibration Sub-Board

Origin: United States GE Multilin (now GE Vernova)

 Hardware Parameters

Dimensions: PCB board approximately 175×75mm, equipped with metal mounting bracket, total weight ≈ 0.45kg (1 pound)

Terminal Connections: Single row 8-pin screw terminal connections, three-phase PT voltage input, sampling output after division to SPM main board

Electrical Function: Precise resistance voltage division for high-voltage PT 100V incoming line, precision calibration of the entire voltage circuit (core function of Calibration), correction of SPM voltage sampling error, ensuring measurement accuracy of overvoltage / undervoltage, and out-of-step protection

Operating Voltage: Compatible with AC 100V PT secondary input, 50/60Hz universal

 Core Functions

SPM Synchronous Motor Protection Specialized: Wind power, power plant 6kV/10kV synchronous motors, large water pump motors. SPM protection device built-in calibration board;

Voltage signal division + accuracy calibration: Precisely attenuate PT secondary line voltage to the DSP acquisition range, onboard precise winding resistor, used for setting protection voltage values during factory or maintenance;

Fault Function: Board damage → SPM voltage sampling drift, protection malfunction / refusal, abnormal power measurement, serving as spare parts for SPM vulnerable components.