ZIV 7IRD-A - Torque Control (Pickup Blocking Enable)

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Chapter 6. Description of Operation of Protection Subsystem

M7IRDA2003I

7IRD-A/J/M: Distribution Protection & Control Terminal

6-8

 7IRD-J Model

Figure 6.5 Overcurrent Unit Block Diagram (7IRD-J Model).

6.1.4 Torque Control (Pickup Blocking Enable)

Both the Time and the Instantaneous Overcurrent elements have inputs referred to as Torque

Control. When the input is energized for the Time Overcurrent function, the operation of the

Time Overcurrent element is blocked by resetting the Integrator module to its initial condition

with the counter at zero.

To enable Time Overcurrent tripping, this input must remain de-energized during the entire

timing process from pickup to trip. If the input is energized for the Instantaneous Overcurrent

element, the instantaneous function is blocked via a logic gate after the level detector outputs

that will hold the timer reset.

For each one of the Torque Control inputs, there is an Enable setting within each protection

element menu in the display. To use these Logic Input Signals, Status Contact Inputs must be

programmed for this application.