相序监控保护

相序监控保护

KSP34E2相序监控保护表、KRM72x相序故障保护继电器

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KSP34E2相序监控保护表、KRM72x相序故障保护继电器

Phase Sequence Control


The phase sequence relay/guard measure three phase AC supplies for correct rotation and will activate and relay output for any fault. A wrong phase sequence will cause fault in rotation or motors and pumps and can cause problems and damages.

The units also monitor for phase failure and phase imbalance in the supply.

There is also the simple phase sequence indicator type without any output signal.




 
KSP34E2 - PHASE MONITORING GUARD

  • Correct Phase Sequence

  • Reversed Phase Sequence

  • Supply Line Voltage Imbalance

  • Loss of a Supply Phase Voltage

Description
KSP34E2 protects and safeguards personnel and equipment against injury and damage due to reversed rotation, and is a must for ship’s shore connection, mobile installations and non-permanent installations. KSP34E2 is to be connected to the supply line voltages.

The KSP34E2 is a moving iron voltmeter incorporating a phase sequence and phase failure trip relay.

The voltmeter can be connected permanently to any one line voltage or via a selector switch to measure all three line voltages.
 

LEDs indicate the phase sequence (direction of rotation), supply failure or voltage imbalance:

- Green: Correct Rotation
- Red: Reversed Rotation/Supply Failure*
- Red: Voltage Imbalance

The trip relay can be used for alarm purposes or to control automatic phase sequence correction relays.

KSP34E2 is insensitive to regenerative power loads, and is designed to function with both loaded and unloaded motors, regenerative four-quadrant drive systems etc.

The unit does not respond to voltage imbalance within the specified line voltage range.

*Note:
Since unit is powered from terminal 1& 2, a supply failure of L1 or L2 will be indicated when all LED’s are off. The output relay will have correct status.


The unit meets IEC60092-504 and the relevant environmental and EMC tests specified in IEC60068/60092 and IEC61000/60533 respectively, to comply with the requirements of the major Classification Societies.

 


 
KRM72x - PHASE FAILURE / SEQUENCE RELAY

  • Phase failure

  • Phase Imbalance

  • Incorrect Phase Sequence

Description
KRM72x monitors three phase AC supplies for incorrect phase sequence, phase failure and phase imbalance on systems up to 500V.

Operation
A sensitivity adjustment on the top of the unit allows adjustment up to 50% of the phase to phase voltage. The minimum level is selected to avoid any nuisance tripping due to normal variations in voltages.

A factory set delay of approximately two seconds prevents tripping due to transients. The unit is factory set for 50/60Hz.

Green LED indicate the phase sequence and will lit when direction of rotation is correct.

Models:

KRM721 : 100-120VAC, 50/60Hz
KRM722 : 200-240VAC, 50/60Hz
KRM725 : 380-500VAC, 50/60Hz