NTDI01 ABB Bailey DCS control system module

Description

NTDI01 A precise measurement of the reset time requires a relay test set capable of dynamic

operation, with three sequenced stages, each with programmable current levels and time

duration, and flexible external contact triggering. NTDI01 To perform such a test, contact GEGE

Multilin for detailed test instructions.

A simple verification of the reset mode selected with the S4 ELEMENTS  GROUND OC 

W1 GND TIME OC  W1 GROUND TIME OC RESET setpoint is obtained using the setup in

FIGURE 7–9: General test setup on page 7–25. The procedure consists of repetitive

operating time measurements in quick succession. If the reset is selected for

“Instantaneous”, the operating time always equals NTDI01 the nominal time derived from the

selected curve. If the reset is selected as “Linear”, the operating time varies as a function of

the time between successive applications of the current signal. If this test is performed at

current multiples of 2 to 3 times the pickup level, the variations in operating time are easier

to detect.

7.5.10.6 Winding 2 or 3 elements

Because the second ground time overcurrent NTDI01 element could be set with completely

different parameters than the element for the first winding, it is necessary to repeat the full

set of tests described above for each winding.

To test the second element,

 Disable all protection elements except for the W2 GROUND TIME

OVERCURRENT (or W3 GROUND TIME OVERCURRENT) element.

 Connect the current signal to X = F12 and Y = E12.

 Repeat all the tests described for the winding 1 ground time overcurrent

element in this section.

This procedure verifies that the ground instantaneous overcurrent performance matches

the in-service settings. Settings for NTDI01 these elements are found under the S4 ELEMENTS 

GROUND OC  W1 GND INST OC 1 setpoints menu. If your relay settings require you to

test at current multiples of several times the rated CT secondary value do not leave the

current signal on for more than a few seconds.

7.5.11.2 Winding 1 Element

To ensure only the ground instantaneous overcurrent 1 element operates the trip relays

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

ground instantaneous overcurrent 1. Use the test setup shown in FIGURE 7–9: General test

setup on page 7–25.

Connect the current supply to terminals X = H10 and Y = G10 to test the winding 1

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

assigned relay settings.

7.5.11.3 Pickup Level

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

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

operate.

 Compare the measured operating NTDI01 level against the S4 ELEMENTS 

GROUND OC  W1 GND INST OC 1  W1 GND INST OC 1 PICKUP

setpoint.

 When the element operates, check that the Trip and Message LEDs are

flashing and one of the following messages is displayed:

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

1

 Reduce the current until the element resets.

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

resets the Trip, Ground, and Message LEDs should remain on if the W1

GND INST OC 1 TARGET was selected as “Latched”. Otherwise, only the

Trip LED should stay on.

 Reset indicators and clear messages.

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