Advertisement
Contents
Document Release History ...............................................................................................................1
Contents............................................................................................................................................3
Section 1: Common Functions.........................................................................................................5
1.1 Overview..............................................................................................................................5
1.2 Before Testing......................................................................................................................5
1.2.1
Safety ......................................................................................................................5
1.2.2
Sequence of Tests...................................................................................................5
1.2.3
Test Equipment........................................................................................................6
1.2.4
Precautions..............................................................................................................6
1.2.5
Applying Settings .....................................................................................................7
1.3 Tests....................................................................................................................................8
1.3.1
Inspection ................................................................................................................8
1.3.2
Secondary Injection Tests........................................................................................8
1.3.3
Primary Injection Tests.............................................................................................8
1.3.4
Putting into Service..................................................................................................8
1.4 AC Energising Quantities .....................................................................................................9
1.5 Binary Inputs......................................................................................................................10
1.6 Binary Outputs ...................................................................................................................11
1.7 Relay Case Shorting Contacts............................................................................................11
Section 2: Protection Functions.....................................................................................................12
2.1 Measured Earth fault (50G) ................................................................................................13
2.1.1
2.2 3 Phase Differential Protection (87/50) ...............................................................................14
2.3 Restricted Earth fault (87REF)..........................................................................................16
Section 3: Supervision Functions..................................................................................................18
3.1 Trip Circuit Supervision (74TCS) ......................................................................................18
3.2 CT Supervision (CT50).....................................................................................................19
Section 4: Control & Logic Functions............................................................................................21
4.1 Quick Logic ........................................................................................................................21
Section 5: Testing and Maintenance..............................................................................................22
5.1 Periodic Tests ....................................................................................................................22
5.2 Maintenance ......................................................................................................................22
5.3 Troubleshooting .................................................................................................................23
Section 6: Relay Software Upgrade Instructions...........................................................................24
6.1 General..............................................................................................................................24
6.2 Replacing firmware on a product installed on site ...............................................................24
6.2.1
Identify Which Software Is Currently Loaded ..........................................................24
6.2.2
Overall Software Information..................................................................................24
6.2.3
Product Configuration Information..........................................................................24
6.2.4
Things To Do Before Loading New Firmware/Software...........................................25
6.2.5
Loading Firmware using front USB port..................................................................25
6.2.6
Solving Software Upload Problems ........................................................................25
©2013 Siemens Protection Devices Limited
Chapter 6) 7SR23 DAD Commissioning & Maintenance Guide
(50G) .........................................................................13
Chapter 6 Page 3 of 26
Advertisement
Chapters
