UFC718AE101 HIEE300936R0101 ABB CPU optical fiber board

Description

UFC718AE101 HIEE300936R0101 This procedure verifies that the phase instantaneous overcurrent performance matches

the in-service settings. The settings for these elements are found under the S4 ELEMENTS

 PHASE OVERCURRENT setpoints menu. The testing occurs at current multiples of at

least five times the rated CT secondary value. UFC718AE101 HIEE300936R0101 Do not leave the current signal on for more

than a few seconds!

7.5.5.2 Winding 1 elements

To ensure that only the phase instantaneous overcurrent 1 element operates the trip

relays (and any other output relays) selected by the logic, disable all protection features

except phase instantaneous overcurrent 1. UFC718AE101 HIEE300936R0101 Use the general test setup shown in FIGURE 7–

9: General test setup on page 7–25.

Connect the current supply to terminals X = H1 and Y = G1 to test the winding 1 phase A

element. Monitor the appropriate output relays as per the relay FlexLogic™ settings or

assigned output relays from Phase IOC settings.

7.5.5.3 Pickup level

 With the interval timer disabled, apply the current signal and increase its

magnitude until the trip relay (and all selected auxiliary relays) operate.

 Compare the measured operating level against the S4 ELEMENTS 

PHASE OC  W1 PHASE INST OC 1  W1 PHASE INST OC 1 PICKUP

setpoint.

 Check that Trip, Pickup, and Phase A(C) LEDs turn on when the

element operates.

 Check that one of the following messages is displayed:

LATCHED a: W1 Phase Inst OC 1 or OPERATED a: W1 Phase Inst

OC 1

Reduce the current until the element resets.

The reset level should be 97% of the UFC718AE101 HIEE300936R0101 operate level. When the element

resets, the Trip and Phase LEDs should remain on if the W1 PHASE INST

OC 1 TARGET was selected as Latched. Otherwise, only the Trip LED

should stay on.

 Reset indicators and clear messages.

7.5.5.4 Operating Time

 Using the setup shown in FIGURE 7–9: General test setup on page 7–

25 and the Interval Timer enabled, set the current level to 1.5 times the

operating level of the element.

 Apply current suddenly by closing the double-pole switch.

 Record the operate time and compare it to the S4 ELEMENTS  PHASE

OC  W1 PHASE INST OC 1  W1 PHASE INST OC 1 DELAY setpoint

value.

7.5.5.5 Phase B and C Elements

If the phase A element performed correctly and met specifications, repeat the pickup level

portion of the above test for phases B and C of winding 1. For phase B, X = H2 and Y = G2.

For phase C, X = H3 and Y = G3. The displayed message should change to indicate the

correct phase, winding, and element that operated.

7.5.5.6 Winding 2 and 3 elements

Because the winding 2 and 3 elements can be set with completely different parameters

than the winding 1 elements, it is necessary to repeat the full set of tests described above

for each winding.

7.5.6 Phase Instantaneous Overcurrent 2

The phase instantaneous overcurrent 2 elements are identical to the phase instantaneous

overcurrent 1 elements. As such, the same test procedure can be used to verify their

correct operation. Disable all protection features except the phase instantaneous

overcurrent 2 elements and follow the steps in the previous section, making the

appropriate changes for the display indications and output relays which are operated by

the phase instantaneous overcurrent 2 elements.

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