ZIV 7IRD-A - Trip;Close Coil Circuit Supervision Input Programming; Trip;Close Output Supervision

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Chapter 6. Description of Operation of Protection Subsystem

M7IRDA2003I

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

6-24

6.8.3 Trip/Close Coil Circuit Supervision Input Programming

The characteristics of the Status Contact Inputs (IN-6, IN-8, IN-5, IN-7) used for Trip and Close

Coil Circuit Supervision functions are different from standard Status Contact Inputs. These

characteristics are determined by the four jumpers located on the protection board and called

J2, J5, J1 and J6. These are associated with the IN-6, IN-8, IN-5 and IN-7 inputs respectively. If

the terminal unit is provided with an additional printed circuit board for the protection subsystem,

the jumpers are placed on the printed circuit board that contains the power supply. To use the

inputs for the supervision functions connect the jumper links in the SUP position.

The Status Contact Inputs associated with the Trip and Close Coil Circuit Supervision

functions are made using the programmable inputs software menu. The programmable inputs

software menu enables the assignment of IN-6, IN-8, IN-5 and IN-7 to SBAIA, SBCIC, SSP-1

and SSP-3 signals respectively. The association made in the preceding figure is:

IN-6SBAIA IN-8SBCIC IN-5SSP-1 IN-7SSP-3

The Trip and Close Coil Circuit Supervision functions operate separately. If only one coil is

monitored, the other Status Contact Inputs can be used for other functions if the printed circuit

board jumper links are modified.

6.8.4 Trip/Close Output Supervision

The Trip and Close Coil Circuit Supervision functions described are also used to monitor the

Auxiliary Contact Outputs used for the trip and close signals:

Trip Coil Circuit Supervision  Trip Output Supervision

Close Coil Circuit Supervision  Close Output Supervision

Signal FSP-1 indicates

that the terminal unit trip

output contact failed to

operate properly. This is

determined by monitoring

the logic “trip” command

generated within the

microprocessor and the

status change of input

IN-5 (SSP-1). A 50 msec.

time delay is provided to

allow for pickup of the

tripping contacts.

Figure 6.13 Trip/Close Output Supervision Block Diagram.

The close output is monitored in a similar manner. Signal FSP-3 indicates an improper close

operation.