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5–100 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL

S5 OUTPUTS CHAPTER 5: SETPOINTS

As mentioned above, the parameters of an equation can contain either INPUTS or GATES.

Inputs and gates are combined into a FlexLogic™ equation. The sequence of entries in the

linear array of parameters follows the general rules listed in the following section.

5.7.4 FlexLogic™ Rules

The general FlexLogic™ rules are listed below.

1. Inputs to a gate always precede the gate in the equation.

Table 5–10: FlexLogic™ output types

Name Type Equation

parameters

Evaluation rate

Output relay 1 solid-state 20 every 1/2 cycle*

Output relays 2 to 5 trip-rated form-A contacts 20 each every 1/2 cycle*

Output relays 6 to 8 form-C contacts 20 each every 100 ms

Self-test relay form-C contacts dedicated for

self-test (not programmable)

--- every 100 ms

Trace trigger waveform capture trigger 10 every 1/2 cycle*

Virtual outputs internal register (for use in

other equations)

10 each every 1/2 cycle*

* refers to the power system cycle as detected by the frequency circuitry of the 745.

Table 5–11: FlexLogic™ input types

Inputs Input is “1” (= ON) if...

Element* pickup The pickup setting of the element is exceeded

Element* operate The pickup setting of the element is exceeded for the programmed

time delay

Logic inputs 1 to 16 The logic input contact is asserted

Virtual inputs 1 to 16 The virtual input is asserted

Output relays 1 to 8 The output relay operates

(i.e. evaluation of the FlexLogic™ equation results in a ‘1’)

Virtual outputs 1 to 5 The virtual output operates

(i.e. evaluation of the FlexLogic™ equation results in a ‘1’)

Timers 1 to 10 The timer runs to completion

(i.e. the ‘start’ condition is met for the programmed time delay)

* refers to any protection or monitoring element in page

S4 ELEMENTS.

Table 5–12: FlexLogic™ gates

Gates Number of inputs Output is “1” (= ON) if...

NOT 1 input is ‘0’

OR 2 to 19 (for 20 equation parameters)