ABB inventory supply NTDI21-A communication card embedded

Description

NTDI21-A Using the setup shown in FIGURE 7–9: General test setup on page 7–25 with the Interval

Timer enabled,

 Set the current level to 1.5 times the element operate level and apply

suddenly by closing the double-pole switch.

 Record the operate time and NTDI21-A compare to the S4 ELEMENTS  GROUND

OC  W1 GND INST OC 1  W1 GND INST OC 1 DELAY value.

7.5.11.5 Winding 2 or 3 Element

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

than the winding 1 elements, it is necessary to NTDI21-A repeat the full set of tests described in this

section for each winding.

Note

Only two ground instantaneous overcurrent 1 elements can be in service

simultaneously.

Note

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

other elements.

7.5.12 Ground Instantaneous Overcurrent 2

The ground instantaneous overcurrent 2 elements are identical to the ground

instantaneous overcurrent 1 elements. Consequently, the same test NTDI21-A procedure may be

used to verify their correct operation. Disable all protection features except ground

instantaneous overcurrent 2. Make the appropriate changes for the display indications

and output relays operated by the ground instantaneous overcurrent 2 elements.

7.5.13 Restricted Ground Fault Polarity Test

This procedure verifies the correct wiring of field CTs (phase and ground) to the

corresponding phase and ground CT terminals on the relay for the purposes of the

restricted ground fault protection. The correct wiring is determined by the distribution of

fault current during external phase A to ground faults on wye-connected windings with

grounded neutral.

From the figure below, the I f fault current travels NTDI21-A through the wye-grounded neutral as I g

and can be simulated by injecting a single current into the phase A (W2) and G1/2

terminals.

The procedure for this test is shown below:

 Select the D/Y30° transformer type into the relay and set the same CT

ratio for both phase and ground winding inputs.

The selected transformer type assures the G1/2 ground input is

associated to winding 2 (wye).

 Enable the restricted ground fault protection only and monitor the

ground differential current under the relay actual values.

 Connect the single current source to inject current into G10 of the

ground G1/2 terminal and to the connected in-series winding 2 phase A

terminals as shown on the figure above.

 Verify the ground current and phase A current are in phase

 Verify the ground differential current is zero

Note

The polarities and wirings of the CTs for the restricted ground fault protection are correct if

the external phase-to-ground fault current is seen on both relay terminals (phase and

ground) in the same direction. The response of the restricted ground fault protection is

based on the magnitude of the ground differential NTDI21-A current resulting from the vector

difference of the neutral and ground currents; that is, .

7.5.14 Restricted Ground Fault Element Test

7.5.14.1 Description

This procedure verifies that the restricted ground fault performance matches the in

service settings. The ground element measures the current signal connected to the ground

current input CT, H10 and G10 or F12 and E12. The neutral (3I o) current is calculated from

the vector sum of the three phase currents. Injecting current into one phase automatically

produces a neutral current (i.e. 3I o = I A). Settings for these elements are found in the S4

ELEMENTS  RESTRICTED GROUND  W1(3) RESTD GND FAULT setpoints menu.

7.5.14.2 Winding 1 Element

To ensure that only the restricted ground fault element operates the trip relays (and any

other output relays selected by the logic) disable all protection features except restricted

ground fault.

Using a current supply as shown in the figure below, connect the I 1 current source to

terminals H1 and G1 for the winding 1 phase current element and I 2 to terminals G10 and

H10 as shown for the ground current element. Monitor the appropriate output relays as

per the relay FlexLogic™ settings or assigned relay settings.

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