239

Description

Multilin 239 is a motor protection relay by General Electric. It safeguards three-phase AC motors from damaging conditions.

Phase Current Inputs

• Conversion: true RMS, 16 samples/cycle
• CT Input: 1 A and 5 A secondary
• Range: 0.1 to 11 × CT primary
• Frequency: 20 to 300 Hz
• Accuracy: ±2% of full scale

Ground Current Inputs

• Conversion: true RMS, 16 samples/cycle
• CT Input: 5 A secondary, 50:0.025
• Range: 0.03 to 1.4 × CT primary (5A CT); 0.05 to 16 A (50:0.025 CT)
• Frequency: 20 to 300 Hz
• Accuracy:
  • 5 A CT: ±2% of full scale
  • 50:0.025 CT: ±0.03 A (0–0.49 A), ±0.07 A (0.5–3.99 A), ±0.20 A (4–16 A)

Overload Curves and Trip Time

• Curves: 15 fixed shapes
• Overload Pickup Inhibit: 1.00 to 5.00 × FLC
• Pickup Level: 1 to 1500 A
• Accuracy:
  • Pickup: ±1% of displayed value
  • Time: ±2% of trip time or ±1 sec (whichever is greater)

Short Circuit and Ground Trip

• Ground Trip Level: 0.05 to 15 A (50:0.025 CT); 3 to 100% (5 A CT)
• S/C Trip Level: 1 to 11 × CT PRI / OFF
• Intentional Delay: Instantaneous or 10 to 60000 ms programmable
• Total Delay: Instantaneous + Intentional

Breaker Failure Timing

• Delay: Instantaneous or 10 to 60000 ms programmable
• Total Delay: Instantaneous + Intentional

Start Protection

• Thermal: Separate start and run protection
• Activation: Inrush current >101% FLC in 1 second
• Deactivation: Current <100% FLC (motor running)
• Locked Rotor: 0.5 to 11 × FLC

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