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1MRS752304-MUM

Issued: 10/1998

Version: D/18.1.2002

Data subject to change without notice

Freq1St_

Underfrequency or Overfrequency

Protection

Stages 1, 2, 3, 4 and 5

Contents

1. Introduction .............................................................................................. 2

1.1 Features..............................................................................................2

1.2 Application........................................................................................... 2

1.3 Input description.................................................................................. 3

1.4 Output description............................................................................... 3

2. Description of Operation.......................................................................... 4

2.1 Configuration....................................................................................... 4

2.2 Measuring mode ................................................................................. 5

2.3 Operation criteria................................................................................. 5

2.4 Setting groups..................................................................................... 7

2.5 Test mode ........................................................................................... 7

2.6 START and TRIP outputs.................................................................... 8

2.7 Resetting.............................................................................................8

3. Parameters and Events............................................................................ 9

3.1 General ...............................................................................................93.2 Setting values.................................................................................... 10

3.2.1 Actual settings.......................................................................... 10

3.2.2 Setting group 1......................................................................... 10

3.2.3 Setting group 2......................................................................... 11

3.2.4 Control settings ........................................................................ 12

3.3 Measurement values ......................................................................... 13

3.3.1 Input data................................................................................. 13

3.3.2 Output data .............................................................................. 13

3.3.3 Recorded data.......................................................................... 13

3.3.4 Events...................................................................................... 17

4. Technical Data ........................................................................................ 18

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Freq1St_ Substation Automation

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1. Introduction

1.1 Features Selectable underfrequency or overfrequency protection

Selectable frequency rate of change function

Start and trip indication in terms of output signals

Definite-time (DT) operation

1.2 ApplicationThis document specifies the functions of the five underfrequency or overfrequency

function blocks Freq1St1, Freq1St2, Freq1St3, Freq1St4 and Freq1St5 used in

products based on the RED 500 Platform. All the five stages are identical in

operation.

The frequency function blocks are specially designed for applications such as

generator protection, load shedding, load restoration and disconnection for island

operation.

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