ABB BAILEY Analog Output Module IMAS011

Description

IMAS011 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 in this

section for each winding.

Note

Only two neutral instantaneous IMAS011 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.

7.5.9 Neutral Instantaneous Overcurrent 2

The neutral instantaneous overcurrent 2 elements are identical to the neutral

instantaneous overcurrent 1 elements. Consequently, the same test procedure can be

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

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

appropriate changes for the LEDs and output relays operated by the neutral instantaneous

overcurrent 2 elements.

7.5.10 Ground Time Overcurrent

7.5.10.1 Description

This procedure verifies that the ground time IMAS011 overcurrent performance matches the in

service settings. Since these elements can be assigned a multitude of timing curves, a

table of expected operating times versus applied current should be prepared prior to

testing. The ground element measures the current signal connected to the ground current

input CT, H10 and G10 or F12 and E12. Refer to Time Overcurrent Curves on page 5–58 for

information on timing curves. There can only be one or two ground time overcurrent

elements in service at the same time.

If the relay elements are set for the “Linear” reset characteristic when measuring the

operating times, ensure there is sufficient time between test current injections for the

element to reset fully. Otherwise, erroneous timing measurements will be obtained. The

settings for these elements will be found under the S4 ELEMENTS  GROUND OC  W1

GND TIME OC setpoints menu.

7.5.10.2 Winding 1 Element

To ensure that only the ground time IMAS011 overcurrent element operates the trip relays (and any

other output relays) selected by the logic,

 Disable all protection features except ground time overcurrent.

Use the general 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 ground element.

 Monitor the appropriate output relays as per the relay FlexLogic™

settings or assigned relay settings.

7.5.10.3 Pickup Level

 With the interval timer disabled, apply the current signal and slowly

increase its magnitude until the trip relay (and all the selected auxiliary

relays) operate.

If the relay has a very inverse time characteristic, it is easier and more accurate to increase

the current far above the pickup level until the trip relay operates and then reduce the

current to just above the operate level. Then slowly reduce the current below the operate

level and observe for a reset action on the trip relay. This reset level for the current should

be approximately 98% of the pickup level. Once the relay drops out, slowly increase the

current until the trip contact closes. The operate level should correspond to the S4

ELEMENTS  GROUND OC  W1 GND TIME OC  W1 GROUND TIME OC PICKUP setpoint.

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

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

LATCHED a: W1 Gnd Time OC or OPERATED a: W1 Gnd Time

OC

 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 should remain on if the W1 GROUND

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

LED should remain on.

 Reset indicators and clear messages.

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