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 disconnection of the load when set limits are exceeded.

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

Main 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 the 3×3-segment display.

• High accuracy and fast response to network faults.

• Mounting on a standard DIN rail.

Operating principles

Normal operation

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

• The relay is activated,

• The OUT LED lights up.

High voltage error (H)

• If the phase exceeds the set limit → an Err In time is expected, the display shows H.

• The relay turns off, the OUT indicator goes out.

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

Low voltage error (L)

• Voltage drop below the set limit → Err In wait, L. is displayed.

• The relay switches off.

• When voltage rises 5 V above the set limit → Err OUT wait, the relay switches on.

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 asymmetry decreases below (set threshold - 2%) → wait time Err OUT, 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 switches off and remains off until the correct sequence is restored.

• After the phase sequence is corrected, Err OUT appears and the relay switches on.

Technical parameters