Refrigeration Units Three Phase Voltage Monitoring Relay phase reversal protect

Refrigeration Units Three Phase Voltage Monitoring Relay phase reversal protect

Neutral loss monitoring function could protect The three-phase circuit composed of a single-phase load is generally asymmetrical. At this time, three-phase four-wire power supply should be used. The role of the neutral line is to ensure that the voltage of each phase is still symmetrical when the load is asymmetric, and it can work normally; if a phase break occurs, it will only affect the load of this phase without affecting the other two-phase load. However, if the neutral wire is disconnected for any reason, when the load of each phase is asymmetric, it will inevitably cause the distortion of each phase voltage and damage the normal operation of each phase load. Therefore, in the three-phase four-wire power supply system, the neutral line is not allowed to open circuit.

What the  function of the neutral 

The three-phase load star connection method is symmetrical. When there is a neutral line and there is no neutral line, when the load is asymmetrical and there is no neutral line, the actual phase voltage of the load with a large impedance is higher than the rated voltage and becomes bright or burned, making the impedance A small load phase voltage dims below the rated voltage. None of them work properly. The role of the midline is: in the three-phase asymmetry, the neutral line can make the three-phase load still get symmetrical phase voltage and work normally

In addition, when the collision is caused by the insulation damage of the electrical equipment with zero protection, the short-circuit current will form a loop through the zero line. Since the zero line impedance is small, the short-circuit current will be very large, which will prompt the protection device to quickly act to disconnect the power supply. In order to play a protective role;

Description

-- Compact modular size

-- Three-phase monitoring of phase sequence, phase loss, over- and undervoltage and phase unbalance

-- Powered by the measuring circuit

-- 2 C/O contacts

-- 5 LEDs for status indication

-- Phase sequence

-- Phase loss

-- Overvoltage

-- Undervoltage

-- Phase unbalance

• Pumps • Fans

• Blowers • Motors

• Compressors

• CE • CCC

♦ Technical data