Hitachi 670 Series Application Guide

Table of contents
Section 1 Introduction....................................................................................................5
1.1 This manual...........................................................................................................................5
1.2 Intended audience.................................................................................................................5
1.3 Product documentation......................................................................................................... 5
1.3.1 Product documentation set..................................................................................................5
1.3.2 Document revision history...................................................................................................6
1.3.3 Related documents............................................................................................................. 7
1.4 Document symbols and conventions.....................................................................................9
1.4.1 Symbols...............................................................................................................................9
1.4.2 Document conventions........................................................................................................9
Section 2 Telecommunication networks and line differential protection................ 11
2.1 Overview..............................................................................................................................11
2.2 Telecommunication network types.......................................................................................11
2.3 Telecommunication networks with symmetric or fixed routes..............................................12
2.3.1 Maximum time deviation between internal clocks............................................................. 13
2.3.1.1 Setting the maximum time deviation............................................................................ 13
2.3.1.2 Reference clock deviation from the set maximum time deviation................................ 14
2.3.2 Longer route switching interruptions ................................................................................ 15
2.3.3 Detecting accumulated time delay changes with echo timing...........................................15
Section 3 Common time synchronization.................................................................. 17
3.1 Design of the time system (clock synchronization)............................................................. 17
3.2 Time synchronization using a built-in GPS receiver............................................................18
3.3 Time synchronization using IRIG-B.....................................................................................19
Section 4 Analog and binary signal transfer for line differential protection...........21
4.1 Communication channels for line differential protection......................................................21
4.2 Communication between channels via Line data communication module..........................22
4.3 Configuration of analog signals...........................................................................................22
4.3.1 Configuration of analog inputs...........................................................................................23
4.3.2 Configuration of output signals..........................................................................................24
4.4 Configuration of redundant channels.................................................................................. 25
4.5 Link forward.........................................................................................................................27
4.5.1 Application configuration ACT...........................................................................................28
4.6 Configurations with power transformers in the protected zone........................................... 29
4.6.1 Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF, LT6CPDIF............................ 29
4.6.1.1 Power transformers in the protected zone................................................................... 29
4.6.2 Line differential protection L4CPDIF................................................................................. 31
4.6.2.1 Possible configurations................................................................................................ 31
4.7 Setting examples.................................................................................................................32
4.7.1 Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF, LT6CPDIF............................ 32
4.7.2 Line differential protection L4CPDIF................................................................................. 41
1MRK505382-UEN Rev. K Table of contents
Communication set-up, 670/650 series 1
Application Guide
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Hitachi 670 Series Specifications

General

Brand	Hitachi
Model	670 Series
Category	Control Unit
Language	English