TENSE Phase Protection Relay - Adjustable Asymmetry 5-50

The phase protection relay from TENSE (Turkey) is designed to protect three-phase electric motors and other three-phase equipment from failures in the power supply network. The device checks for correct phase sequence, phase asymmetry, undervoltage, and overvoltage, ensuring safe load disconnection when set limits are exceeded.

The wide range of adjustments makes the relay suitable for most industrial and commercial applications, especially where precise and stable motor protection is required.

Key Features

• Phase sequence control: protection against incorrect wiring.

• Adjustable asymmetry: 5% - 50%.

• Adjustable undervoltage: 260-360 V AC.

• Adjustable overvoltage: 400-480 V AC.

• Adjustable fault delay time (Err In): 1-30 s.

• Adjustable recovery time (Err OUT): 1-30 s.

• Clear indication on 3×3 segment display.

• High accuracy and fast response to network faults.

• Standard DIN rail mounting.

Operating Principles

Normal Operation

When all phase voltages are within limits and the phase sequence is correct:

• the relay trips,

• The OUT LED lights up.

High Voltage Error (H)

• If the phase exceeds the set limit → Err In time is pending, H is displayed.

• The relay disconnects, OUT turns off.

• When 5 V drops below the set value, Err OUT starts operating, the relay turns back on.

Low Voltage Error (L)

• Drop below the set limit → Err In pending, L is displayed.

• The relay disconnects.

• When the voltage rises 5 V above the threshold → Err OUT pending, the relay activates.

Phase Asymmetry (Asy)

• If the voltage difference between phases exceeds the set threshold (5-50%):

  • ASy is displayed after Err In time, the relay deactivates.

• When asymmetry drops below (set threshold - 2%) → Err OUT pending, the relay activates.

Phase Sequence Error (pHs)

• When a phase sequence error occurs, the relay waits for Err In and then displays pHs.

• The relay turns off and remains off until the correct sequence is restored.

• Once the phase sequence is corrected, Err OUT occurs and the relay turns on.

Technical Parameters