ABB module LIMELITE 2000 CPU module PLC/DCS system spare parts

Description

LIMELITE 2000 The 5th harmonic scheme operates if the 5th harmonic content of any current signal

connected to the relay exceeds the threshold setting, for the set time, provided that the

level is above the set threshold.

 Disable all protection functions except the 5th harmonic function.

The 5th harmonic scheme settings LIMELITE 2000 are in the S4 ELEMENTS 

OVEREXCITATION  5th HARMONIC LEVEL setpoints menu.

This test requires a current generator capable of producing a fundamental and 5th

harmonic component.

 Connect the current signal to H1 and G1 and set the fundamental

component level above the threshold setting.

 Slowly increase the amplitude of the 5th harmonic component until the

element operates.

 Calculate the ratio of 5th harmonic LIMELITE 2000 to fundamental at which operation

occurred and compare this value to the setting of the element.

 Check that the Trip, Pickup (and if selected, Alarm) LEDs are on, and

one of the following is displayed:

LATCHED: 5th Harmonic Level or OPERATED: 5th Harmonic

Level

 Reduce the 5th harmonic component until the element resets.

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

 Reset indicators and clear messages.

 Repeat the above steps with a fundamental current level below the

threshold setting.

 Ensure that the element LIMELITE 2000 does not operate.

 For timing tests, simulate an operating condition as above and apply

suddenly to the relay and measure the operating time.

The time should be the same as the setting in the element.

The three elements under the insulation aging feature, hottest-spot limit, aging factor limit,

and loss of life limit, must be tested with a valid set of transformer data programmed into

the relay. The ambient temperature must also be programmed (obtained from an RTD or

programmed as 12-month averages). The tests consist of simulating transformer loading

by applying a current signal to winding 1 phase A at the correct frequency.

7.5.19.2 Hottest-spot Limit

The hottest-spot temperature value is a function of load, ambient temperature, and

transformer rating.

 Apply a current to winding 1 phase A to LIMELITE 2000 represent at least a 100% load

on the transformer.

 Use the A2 METERING  LOSS OF LIFE  HOTTEST-SPOT

WINDING TEMPERATURE actual value to observe the hottest spot

temperature increases gradually. The simulated load to may be increased

for a faster temperature rise.

When the hottest spot temperature reaches the S4 ELEMENTS  INSULATION AGING 

HOTTEST-SPOT LIMIT  HOTTEST-SPOT LIMIT PICKUP operating level, the element should

operate.

 Verify all programmed relay operations as per FlexLogic™ settings.

 Verify that all the targets and messages are as expected and

programmed.

The time delay can be verified with a watch as the delay is normally set in minutes.

7.5.19.3 Aging Factor Limit

The Aging Factor value is also a function of load, ambient temperature, and transformer

ratings.

 Apply a current to Winding 1 Phase A to represent at least a 100%

transformer load.

 Use the A2 METERING  LOSS OF LIFE  INSULATION AGING

FACTOR actual value to observe that the aging factor increases

gradually.

 You may want to increase the simulated load or the simulated or

programmed ambient temperature to cause a faster increase.

When the aging factor reaches the S4 ELEMENTS  INSULATION AGING  AGING

FACTOR LIMIT  AGING FACTOR LIMIT PICKUP operating level, the element should

operate.

 Verify all programmed relay operations as per FlexLogic™ settings.

 Verify that all the targets and messages are as expected and

programmed.

The time delay can be verified with a watch as the delay is normally set in minutes

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