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
Imax
— Upper limit for current
scalar
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
Ifb
— Actual current in feedback loop
scalar
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
⍵m max
— Rotor speed limit for overspeed protection
scalar
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
⍵m fb
— Actual rotor speed
scalar
Actual rotor speed at a given time.
Dependencies
To enable this port, set Select Protection to
Overspeed
.
Data Types: single
| double
| fixed point
Vmax
— Upper voltage limit for overvoltage protection
scalar
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
Vmin
— Lower voltage limit for undervoltage protection
scalar
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
Vfb
— Actual voltage across feedback loop
scalar
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
Reset
— External reset pulse
scalar
External pulse that resets the fault latch.
Data Types: single
| double
| fixed point
Output
y
— Latched fault signal
scalar
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
Select Protection
— Type of protection relay
Overcurrent
(default) | Overspeed
| Overvoltage
| Undervoltage
Available protection types to configure block behavior during the overcurrent, overspeed, overvoltage, and undervoltage conditions.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.
Version History
Introduced in R2020a
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