Phase Sequence Protection Relay

Phase sequence protection relays are protective relays capable of automatically determining phase sequence, preventing accidents or equipment damage in certain special electromechanical devices due to reversed power phase sequence. They are mostly used in elevators, central air conditioning systems and similar equipment.

Phase Sequence Protection Relay TPR-4R11

Power Type: Three-phase four-wire star connection

Phase Sequence Protection Relay TPR-18F81-R2

Power Type: Three-phase delta connection

Features:

• Phase sequence monitoring
• Phase loss alarm
• Compact design
• Real-time monitoring of power phase sequence and phase balance status
• An alarm signal is generated if any phase imbalance exceeds 40%
• LED indicators indicate the cause of the fault, improving maintenance efficiency.

Phase Sequence Protection Relay Installment:

• Install the product on the DIN rail and ensure that the spring clamp is securely fastened.
• Connect the three-phase power supply lines to the terminals according to the phase sequence of the three-phase power supply as per the design requirements.

Normal Monitoring State:

Turn on the three-phase power supply, and the green indicator light will illuminate. If the phase sequence of the three-phase power supply is correct, the yellow indicator light will also illuminate.

The phase sequence relay is in the normal monitoring state: Output terminals 11 and 14 are closed, and 11 and 12 are open.

When the green light is on, the yellow light is off, or both the green and yellow lights are off, the three-phase power supply is in an incorrect phase sequence or phase deficiency state.

The phase sequence relay is in the alarm state: Output terminals 11 and 14 are open, and 11 and 12 are closed. The user should immediately stop the operation and check the three-phase power supply.

Terminals:

Three phase input: L1/L2/L3

Relay output: NC 11/12; NO 11/14