The Chint XJ3-D is a multifunctional protection relay that monitors three-phase voltage conditions and protects equipment, especially electric motors, from various electrical faults.
Main Functions and Protection
The Chint XJ3-D relay provides several important protection functions for three-phase systems, which can be adjusted via the knobs on its panel:
Phase Failure: Protects the motor when a phase is lost or disconnected.
Phase Sequence: Ensures the correct phase sequence (R-S-T), preventing the motor from rotating in the wrong direction.
Phase Unbalance: Detects if there is a significant voltage difference between phases.
Overvoltage: Protects equipment from voltage conditions that exceed the set normal limits (e.g., 380-460V, adjustable).
Undervoltage: Protects equipment from voltage conditions that drop below the set normal limits (e.g., 300-380V, adjustable).
The following are the general specifications for the Chint XJ3-D standard 380 VAC model:
Rated Voltage: 380 VAC
Overvoltage Setting Range: 380 - 460 V (adjustable)
Undervoltage Setting Range: 300 - 380 V (adjustable)
Overvoltage Delay Time: 1 - 5 seconds (adjustable)
Undervoltage Delay Time: 0.5 - 2 seconds (adjustable)
Phase Failure Response Time: < 0.1 second
Phase Sequence Response Time: < 0.1 second
Output Contacts: 1 switching contact (Ta, Tb, Tc - typically 1 NO and 1 NC)
Indicators: Equipped with LEDs for status signals (overvoltage, undervoltage, phase failure)
This relay functions as a control device to monitor voltage conditions and provide reliable protection for electric motors and other three-phase equipment in industrial applications.