GE Multilin
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Buy GE Multilin SPM

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Reference Material

• SPM Synchronous Motor Protection System Brochure

GE Multilin SPM Synchronous Motor Protection System

Synchronous Motor Protection System - Starting Protection, Synchronization & Control for Synchronous Motors

The SPM controls starting, synchronizing and protection of collector-ring or brushless type synchronous motors. An important motor protection function is preventing squirrel cage winding overheating during motor starting. For brushless motors squirrel cage protection is derived from stator current inputs. For collector ring motors the squirrel cage protection algorithm is based on motor rotation speed during acceleration. Speed is determined from the frequency of the induced rotor voltage across the rotor discharge resistor.

GE Multilin SPM - Restart Protection

The GE Multilin SPM simulates the cooling of a running motor, updating the relay thermal memory in one-minute spans. The SPM will also learn the amount of thermal capacity required for a successful motor start. Each new value of the thermal capacity is compared with the learned starting capacity required. The SPM will prevent an attempted restart if the cage winding has not had sufficient cooling time to allow a successful start. This element is used to avoid motor overheating due to frequent starts.

GE Multilin SPM Synchronous Motor Protection & Control

• Field application
• Restart lockout
• PF regulation maximizes efficiency
• Stall/acceleration
• Reluctance torque synchronizing
• Power factor (pull-out)
• Re-synchronizing
• Field winding overtemperature
• DC field current loss
• Incomplete sequence
• DC field voltage check

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