ABB PFSA145 3BSE008843R1 mainboard controller DCS system

Description

PFSA145 The THD elements will only operate if the amplitude of the fundamental component is

above the threshold setting.

To verify this threshold,

 Initially set the fundamental component above the threshold, with a

harmonic content high enough to PFSA145 cause the element to operate.

 Now reduce the fundamental component only.

This will have the effect of increasing the THD level. When the

fundamental component reaches a value below the set threshold, the

element will reset.

If an RMS-responding meter is used to measure the current signal, the reading is the

total value of current. To determine the fundamental component only, use the relay

values in A2 METERING  CURRENT  W1 CURRENT. These values represent the

fundamental component only.

7.6.1.4 Other THD Elements

A THD element can be programmed for PFSA145 each winding of the transformer. Use the above

procedures to verify the element(s) on the other winding(s).

7.6.2 Harmonic Derating Function

Testing of the harmonic derating function requires that accurate transformer parameters

such as load losses at rated load and winding resistance be entered. This feature makes

use of the harmonic derating factor (HDF) computed by the relay, using the harmonic

content of the current signals and the transformer data (refer to IEEE C57.110-1986 for the

computation method). Once the derating PFSA145 factor falls below a set value, the 745 can trip

and/or alarm.

7.6.2.1 Operating level

To verify the correct operation of this element, a current signal containing harmonics must

be introduced into one phase of the relay. Use FIGURE 7–1: Test setup on page 7–4 to

accomplish this.

 Set the fundamental component at rated CT secondary into winding 1

phase A.

 Gradually increase the second harmonic component (and the rest of the

even harmonics) while displaying PFSA145 the A2 METERING  HARMONIC

CONTENT  HARMONIC DERATING  W1(3) HARMONIC

DERATING FACTOR value.

The element should operate when the displayed HDF equals the element

setting.

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

one of the following is displayed:

LATCHED: W1 Harm Derating or OPERATED: W1 Harm

Derating

 Lower the DC component until the element resets.

The reset value should be approximately 2% larger than the operate

value.

 Verify that the Pickup and Alarm LEDs reset if the target function is set

to Self-resetting.

The Trip LED should remain latched.

7.6.2.2 Operating Time

To measure the basic operating time of this element,

 Preset a fundamental and DC component composite current signal to

cause the element to operate.

 Using the setup of FIGURE 7–1: Test setup on page 7–4, apply the

current suddenly, at the same time the timer is triggered.

The measured operating time should correspond to the time delay

setting for the element.

7.6.3 Transformer Overload

The transformer overload element uses the phase A current of each winding to compute a

transformer loading. The computation assumes a rated voltage on the wInding, hence the

loading is effectively a percent of rated load current.

7.6.3.1 Operating Level

 Inject a fundamental-frequency current into phase a of winding 1.

 Increase the current signal to a value just above the transformer

overload pickup setting (take into account the CT ratio and the rated

MVA phase current to set the current correctly).

The element should operate after its set time delay.

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

one of the following is displayed:

LATCHED: Xformer Overload or OPERATED: Xformer Overload

 Lower the current until the element resets.

The reset value should be approximately 97% of the operate value.

 Verify that the Pickup and Alarm LEDs reset if the target function is set

to Self-resetting.

The Trip LED should remain latched.

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