Protection Relay

Implement protection relay with definite minimum time (DMT) trip characteristics

  • Library:
  • Motor Control Blockset / Protection and Diagnostics

Description

The Protection Relay block implements a protection relay for the hardware and the motor with definite minimum time (DMT) trip characteristics using the reference limit, feedback, and reset input signals. In the event of a fault, the block generates a latched fault signal that you can use to protect the hardware and the motor. You can reset the fault latch using an external reset signal.

Ports

Input

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Upper limit for current in the feedback loop, so as to provide overcurrent protection. The block generates a latched fault signal when the current in the feedback loop (Ifb) exceeds this value.

Dependencies

To enable this port, set Select Protection to Overcurrent.

Data Types: single | double | fixed point

Actual current in the feedback loop at a given time.

Dependencies

To enable this port, set Select Protection to Overcurrent.

Data Types: single | double | fixed point

Speed limit of the rotor (in RPM). The block generates a latched fault signal when the rotor speed (m fb) exceeds this value.

Dependencies

To enable this port, set Select Protection to Overspeed.

Data Types: single | double | fixed point

Actual rotor speed at a given time.

Dependencies

To enable this port, set Select Protection to Overspeed.

Data Types: single | double | fixed point

Upper limit for voltage across the feedback loop. The block generates a latched fault signal when the voltage across the feedback loop (Vfb) exceeds this value.

Dependencies

To enable this port, set Select Protection to Overvoltage.

Data Types: single | double | fixed point

Lower limit for voltage across the feedback loop. The block generates a latched fault signal when the voltage across the feedback loop (Vfb) is less than this value.

Dependencies

To enable this port, set Select Protection to Undervoltage.

Data Types: single | double | fixed point

Actual voltage across the feedback loop at a given time.

Dependencies

To enable this port, set Select Protection to either Overvoltage or Undervoltage.

Data Types: single | double | fixed point

External pulse that resets the fault latch.

Data Types: single | double | fixed point

Output

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Latched fault signal that the block generates during the overcurrent, overspeed, overvoltage, and undervoltage conditions to protect the hardware and the motor.

Data Types: single | double | fixed point

Parameters

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Available protection types to configure block behavior during the overcurrent, overspeed, overvoltage, and undervoltage conditions.

Introduced in R2020a