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 faults in the power supply network. The device checks the correct phase sequence, phase asymmetry, undervoltage, overvoltage and ensures safe load disconnection when the set limits are exceeded.

The wide range of settings 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 error 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.

• Mounting on standard DIN rail.

Operating principles

Normal operation

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

• the relay will trip,

• 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 switches off, OUT goes off.

• When 5 V drops below the set value, Err OUT starts to run, relay turns on again.

Low voltage error (L)

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

• The relay switches off.

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

Phase asymmetry (Asy)

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

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

• When the asymmetry is reduced below (set threshold - 2%) → Err OUT wait time, the relay switches on.

Phase sequence error (pHs)

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

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

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

Technical parameters