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The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

The KUC755AE105 3BHB005243R0105 time-delayed phase overvoltage protection is used to protect electrical equipment and its insulation from overvoltage by measuring the three-phase voltage. In this way it prevents damage to exposed primary and secondary equipment in the power system.

The phase overvoltage protection function continuously measures the three-phase voltages and activates the corresponding output signals if the measured phase voltages exceed a preset value (start) and remain high for more than the time delay setting on the timer (trip). This function also detects the phase that caused the operation.

KUC755AE105 3BHB005243R0105 Applications

The fuse fault monitoring function fuse continuously monitors the AC voltage circuit between the voltage transformer and the terminals. In the event of a fault in the AC voltage secondary circuit, different output signals can be used to prevent the operation of the distance protection and other voltage-related functions, such as the synchronization check function and undervoltage protection. Different measurement principles can be used for the fuse fault monitoring function. It is recommended to use the FUSE function based on the zero sequence measuring principle in direct or low impedance grounding systems.

KUC755AE105 3BHB005243R0105 The FUSE function based on the zero-sequence measuring principle continuously measures the zero-sequence current and voltage in all three phases. It operates if the measured zero sequence voltage increases above the preset operating value and the measured zero sequence current remains below the preset operating value. There are three output signals available. The first one depends directly on the voltage and current measurements. The second depends on the operation of the dead wire detection function to prevent unnecessary operation of the distance protection when the line is de-energized and energized under fuse failure conditions. The third depends on the loss of all three measured voltages.

The special function input is used to connect the auxiliary contacts of the miniature circuit breaker MCB (if used) to ensure the correct operation of the function in the event of simultaneous interruption of all three measured phase voltages and in the absence of additional Δcurrent and Δvoltage algorithms in the function block.

The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

The ABB KUC755AE105 3BHB005243R0105 module/control unit continuously monitors the voltage transformer

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