ABB NTRO02-A DCS terminal control module

Description

NTRO02-A With the interval timer disabled, apply the current signal feeding the

phase current element and increase its magnitude slowly until the trip

relay, and all the selected auxiliary NTRO02-A relays, operate.

The operate level should correspond to the S4 ELEMENTS 

RESTRICTED GROUND  W1 RESTD GND FAULT  W1 RESTD GND

FAULT PICKUP setting.

 When the element operates, check that the Trip, Ground, NTRO02-A and Pickup

LEDs are on and that one of the following messages is displayed:

LATCHED a: W1 Restd Gnd Fault or OPERATED a: W1 Restd

Gnd Fault

 Reduce the current until the element resets.

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

resets, the Trip and Message LEDs NTRO02-A should remain on if the W1 RESTD

GND FAULT TARGET was selected as Latched. Otherwise, only the Trip

LED should remain on.

 Reset indicators and clear messages.

7.5.14.4 Operating Time

 Select three (3) or four (4) delay times at which the timing is to be

measured.

 With the interval timer enabled, set the current level to the desired value

and apply suddenly by closing the double-pole switch.

 Record the operate time and compare to the expected value.

 Repeat for the all the desired NTRO02-A values of current.

7.5.14.5 Slope

 To measure the slope, connect current signals to the relay as shown in

the figure above.CHAPTER 7: COMMISSIONING

PROTECTION SCHEMES

745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–39

 Inject the I1 current such that the ground differential pickup value

divided by the I1 current is less than the slope setting. Set I2 = 0 A.

The element will operate since the NTRO02-A current appears as ground

differential.

 The slope is calculated from the values of Iground differential and Imax as

shown below:

(EQ 7.11)

where I max represents the maximum phase current for the

winding being measured.

As I 2 is increased, the element will reset when the percentage of

slope drops below the slope setting.

 Slowly increase I2 until the element operates again.

 Calculate the slope at this point.

 Decrease the slope setting to 0% then continue to increase the I2 current

until the element resets.

 Slowly increase I2 until the element operates again.

The reset level should be 97% of operate level. When the element resets, the Trip and

Message LEDs should remain on if the W1 RESTD GND FAULT TARGET was selected as

“Latched”. Otherwise only the Trip LED should remain on.

7.5.14.6 Winding 2 or 3 Elements

Since the second restricted ground fault element can be set with completely different

parameters than the first element winding, it is necessary to repeat the full set of tests

described in this section for each NTRO02-A winding.

To test the second element,

 Disable all protection elements except for the winding 2 (or winding 3

as appropriate) restricted ground fault element.

 Connect the ground current signal to terminals F12 and E12.

 Repeat all the tests described for the winding 1 element in this section.

Note

The blocking from logic input, if enabled, can be tested as described in earlier tests for

other elements.

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