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JFScholtz/Nov06 (Rev 0) to ensure traceability

GUIDELINE

Document Classification: Controlled Disclosure

Reference: 34-327

Document Type: DGL

Revision: 0

Effective date: DECEMBER 2006

Total pages: 26

Title: Substation Interface Fibre OpticDesign Guide

Revision date: DECEMBER 2009

TESCOD APPROVEDCOMPILED BY APPROVED BY FUNCTIONAL RESP AUTHORISED BY

Signed _ _ _ _ _ _ _

F KENNYR HARIRAME SEGERS

Signed _ _ _ _ _ _ _

R WESTWOOD

Signed _ _ _ _ _ _ _

P R GROENEWALD

Signed _ _ _ _ _ _ _

MN BAILEY

Engineers "SC Chairperson" for TESCOD CMDT for MD (Dx)

Content

Page Foreword..............................................................................................................................................2 1. Scope..........................................................................................................................................2 2. Normative references..................................................................................................................2 3. Definitions and abbreviations......................................................................................................3 4. Requirements..............................................................................................................................3

4.1 Fibre Multiplexers ...................................................................................................................3 4.2 Single Circuit Networks ..........................................................................................................7 4.3 4-Channel Fibre Multiplexer ...................................................................................................9 4.4 Telephone Modems..............................................................................................................10 4.5 Teleprotection Equipment.....................................................................................................11 4.6 Cost Analysis........................................................................................................................12 4.7 Advantages and Disadvantages...........................................................................................17 4.8 Conclusion............................................................................................................................18 4.9 Recommendations................................................................................................................19

Annex A Case Study 1: Bluedowns - Firgrove Fibre Optic Communications using SEL-2829F .....20 Annex B Case Study 2: Idwala - Oribi Fibre Optic Communications using SEL-2829F ..................22 Annex C Case Study 3: Muldersvlei - Springfield Fibre Optic Communications using SEL-2505 ...24 Annex D Case Study 4: Muldersvlei Stellenbosch PLC ................................................................25 Annex E Impact assessment ............................................................................................................26

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DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE

Substation Interface Fibre Optic Reference: 34-327Design Guide Revision: 0

Page: 2 of 26

When downloaded from the EDS database, this document is uncontrolled and the responsibility rests with the userto ensure it is in line with the authorised version on the database.

Foreword

Presently, BME is being used to interface to fibre optic telecomms equipment at substations. This

guide is aimed at finding an alternative, cost effective solution to the BME where fibre optic is beingused. Fibre multiplexers and modems may provide a more cost effective solution than the BME undercertain conditions.

Revision history

Date Rev. Compiler Remarks

October 2006 A Fadeelah Kenny Draft

December2006

0 Fadeelah Kenny Document approved.

Authorisation

This document has been seen and accepted by:

Name DesignationMN Bailey Corporate Manager (Divisional Technology IARCP Groenewald Control Plant Manager - IARCD Gutchow Telecomms Discipline Specialist IARCR Westwood Telecoms SC Chairman

This guide is applicable to the Distribution Division of Eskom Holdings (Pty) Limited.

Development teamThe development team comprised of the following individuals:

Erlind Segers (TCM Western region)

Rishi Hariram (IARC Telecontrol Engineer)

Fadeelah Kenny (EDNS Assistant Engineer)

1. Scope

1.1 Purpose

This guide is aimed at finding an alternative, cost effective telecommunications solution to the BMEwhere fibre optic is being used as a comms medium at substations. Fibre multiplexers and modemsmay provide a more cost effective solution than the BME under certain conditions.

2. Normative references

Parties using this document shall apply the most recent edition of the documents listed below :

IDC Document: Practical SCADA & Telemetry Systems for Industry

TST41-115: Substation Fibre Optic Cable Installations, Rev 0

Product OS308M: 8 Channel Multiplexer for Telecommunications User Manual, Issue 1.1, 6November 2002

Utility Communications - FOX-Family Overview, online brochure: www.abb.co.za

FOX515 solution for TCP/IP traffic, online brochure: www.abb.co.za

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FOX515 DATAx: The Data Universal Interface, online brochure: www.abb.co.za

3. Defini tions and abbreviations

3.1 Definitions

3.1.1 Asynchronous : Communications where characters can be transmitted at an arbitrary,unsynchronised point in time and where the time intervals between transmitted characters may be ofvarying lengths. Communication is controlled by start and stop bits at the beginning and end of eachcharacter.

3.1.2 Synchronous: Transmission in which data bits are sent at a fixed rate, with the transmitter andreceiver synchronised. Synchronised transmission eliminates the need for start and stop bits.

3.1.3 Mirrored Bits: A relay-to-relay logic communications scheme used by Schweitzer EngineeringLaboratories in their protection relays

3.2 Abbreviations

3.2.1 ADD: Advanced Digital Devices

3.2.2 BME: Bandwidth Management Equipment

3.2.3 IP: Internet Protocol

3.2.4 Kbps: Kilo Bits per Second

3.2.5 Mbps: Mega Bits per Second

3.2.6 MUX: Multiplexer

3.2.7 OLTE: Optical Line Termination Equipment

3.2.8 PLC: Power Line Carriers

3.2.9 SCADA: Supervisory Control and Data Acquisition System

3.9.10 SEL: Schweitzer Engineering Laboratories (PTY) LTD

3.2.11 S/S: Substation

4. Requirements

4.1 Fibre Multip lexers

4.1.1 ADD-OS308M

The OS308M is supplied by ADD (Advanced Digital Devices) and is an 8 channel, 64kbps audio dropand insert multiplexer. The line terminating equipment is supplied as individual cards that are fit intothe card frame as the application requires. It operates in a ring network controlled by the master unitOS2030. The following cards are available to configure the OS308M:

4.1.1.1 OS3081R: RS-232 card that has a DB25 connector and supports data speeds up to 64kbits/sec (synchronous) and 28.8kbits/sec (asynchronous)

4.1.1.2 OS3081X: X.21 card that has a DB15 connector that supports data speeds up to 64kbits/sec(synchronous) and 28.8kbits/sec (asynchronous). This card also supports RS-422

4.1.1.3 OS3081T: 2 wire telephone card that is coupled directly to a telephone

4.1.1.4 OS3081E: 2 wire telephone card that interfaces directly with an exchange line

4.1.1.5 OS3081W: 4 wire audio interface with E&M signalling

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A PC with dedicated software can be used to configure the OS308 via its RS-232 port or the OS2030master. The distance over which the system can operate is determined by the fibre interface used. Theoptions are limited to 3, 12, 16, 24, 36, 50 and 70 kilometres. The power supply can be replaced byexchanging the power supply module with a 220VAC, 110VAC or 48VDC unit. The unit is modular indesign and can thus be upgraded with different optics or power supply.

The following diagrams illustrate possible configurations when utilising the OS308M multiplexer:

Figure 1: OS308M Application 1

Figure 2: OS308M Applic ation 2 - The OS308M integrated in to t he BME network

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Figure 3: OS308M Application 3 Cascading to form a network linked to the BME network

4.1.2 ABB FOX Multiplexers

ABB offers the FOX family of 64kbps fibre multiplexers. The FOX512 is an add-drop multiplexer,similar to the OS308M, and offers 8 slots for any mix of interface cards required. The following cardsare available for configuration:

4.1.2.1 DATAx card: For 4 data ports, RS-232 and/or X.21 available

4.1.2.2 SUBH: Telephone subscriber card

4.1.2.3 EXLAN: Exchange card

4.1.2.4 LAWA 4 card: 10BaseT Ethernet interface card

4.1.2.5 TEBIT (Teleprotection and Binary Unit N4BD): Teleprotection circuit

4.1.2.6 Some additional features that the FOX family have to offer are:

The data card has 4 ports that can each be configured as RS-232 or X.21 independently. It alsohas the options of 1+1 path protection, performance monitoring, point to multipoint, and subratemultiplexing.

The LAWA4 card offers IP to connect different LANs, or the data card can be used as 3 data portsand one LAN port.

The TEBIT card provides easy integration of teleprotection into the telecommunicationsequipment, allowing permissive tripping, inter-tripping, blocking/non-blocking and T-off.

The FOX range is managed with FOXMAN, an SNMP/CORBA based Network Management System,with graphical network representation and point and click operation.

The range of the equipment is 100km, which can be increased at 8Mbps. This range can be increasedfurther with the use of boosters.

This multiplexer can be powered by 48 VDC or 220 VAC.

The diagrams below illustrate possible configurations when utilising the FOX512 multiplexer:

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Figure 4: FOX512 Appli cation 1 - the interface cards available

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Figure 5: FOX 512 Appl ication 2 - the FOX512 integrated into the BME network

Figure 6: FOX512 Application 3 - cascaded to form a network linked to the BME network

4.2 Single Circui t Networks

In certain applications a single circuit solution may provide a more suitable and cost effective solution(e.g. in an existing substation where some services are already available).

4.2.1 SEL Fibre Optic Transceivers/Modems

The SEL range of fibre optic transceivers is for medium to long range transmission ranging from 500mto 80km. They plug directly into a 9-pin RS-232 port and are powered from the port.

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The Eskom Distribution philosophy is to use multimode fibre inside a substation and single mode fibrebetween substations. The following SEL transceivers with their respective ranges are available forasynchronous communication over RS-232:

Table 1: The SEL transceivers with their respective ranges available for asynchronouscommunication over RS-232

Modem Data Rate Fibre Type Power range Range

SEL-2800 40 kbps Multimode 3.6 15 VDC 500m

SEL-2810 20 kbps Multimode 3.6 15 VDC 500m

SEL-2812 115 kbps Multimode 3.6 15 VDC 1.2 4km

SEL-2814 115 kbps Multimode 3.6 15 VDC 1.2 4km

SEL-2815 40 kbps Multimode 5.2 15 VDC 6 15km

SEL-2829 40 kbps Single mode 5.2 15 VDC 23km

SEL-2830 40 kbps Single Mode 5.2 15 VDC 80km

Figure 7 below shows how the SEL-2829 can be configured.

Figure 7: SEL-2829 transceiver directly connected over fibre

Annex A and B discusses how SEL-2829Fs were used to interface with BME through a X.21 and RS-232 card respectively.

4.2.2 LL2100: Single Channel X.21 to Fibre Multiplexer

The LL2100 is a single channel X.21 interface from ADD which operates from 19 to 2048K baud (seeFigure 8 below). The distance over which the system can operate is determined by the fibre interfaceused. The options are limited to 3.5, 12, 16, 36, 50 and 70 km. It is powered by 110/220VAC.

optic fibre

SEL-2829

Site A Site B

SEL-2829

optical optical

RS-232RS-232

Relay Relay

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Figure 8: LL2100 provides a si ngle X.21 interface

4.3 4-Channel Fibre Multip lexer

4.3.1 LL400: 4 Channel RS 232 to Fibre Mult iplexer

ADD also offers the LL400 that combines 4 channel high speed synchronous or 16 channelasynchronous data RS-232 channels into a single channel high speed fibre link (shown in Figure 9below). The unit can either use an external clock or an internal 1200 to 38400 baud selectable by

rotary dip switches. It can operate at 48VDC or 220VAC power supplies. Depending on the fibre used,distances of up to 25km can be reached.

Figure 9: LL400 Application

optic fibre

LL2100

Site A Site B

LL2100optical optical

X.21X.21

Relay Relay

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4.4 Telephone Modems

4.4.1 LL300 Single Channel Telephone Extender

The LL300 from ADD offers an optical single channel interface between an exchange and a telephone(refer to Figure 10 below). The system consists of two separate units, namely the LL300E for theexchange side and LL300T for the telephone side. It is powered by 110/220V AC.

4.4.2 LL304: 4-Channel Telephone Extender

The LL304 operates in the same way as the LL300 except that it can have up to 4 telephonesconnected to it (refer to Figure 10 below).

Figure 10: LL300 and LL304. Telephone exchange is l inked to the BME network

In order to interconnect substations, a loop design and direct connections were considered. A majordisadvantage of a loop design is that a fault with one transceiver will affect the other lines. The

disadvantage of directly connecting to each substation is the increased cost due to the more fibrecable usage. However, the direct connection design forms a more robust solution and is the preferredoption. Figure 11 illustrates this design.

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BME

4 wire

E&M

Interface

4 channel

4 wire

E&M

2wireE&M

LL300T

BackboneSite

Substation A

2wireE&M

Substation B

LL300T

2wireE&M

LL300T

Substation C

2wireE&M

LL300T

Substation D

LL304E

BME

4 wire

E&M

Interface

4 channel

4 wire

E&M

2wireE&M

LL300T

BackboneSite

Substation A

2wireE&M

Substation B

LL300T

2wireE&M

LL300T

Substation C

2wireE&M

LL300T

Substation D

LL304E

Figure 11: Direct Connection to each subst ation

4.5 Teleprotection Equipment

4.5.1 SEL- 2505

The SEL-2505 is an eight-contact input, eight-contact output device. It communicates via a fibre opticport with a remote device using a protocol called Mirrored Bits 8. Each contact input controls one ofthe eight Mirrored Bits transmit bits, while each of the eight received Mirrored Bits controls an outputcontact. Mirrored Bits communications time is 2ms and the communication port transmits and receives

at 38.4 kbps.

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Figure 12: Two SEL-2505s can be directly c onnected over fib re

Annex C shows a more detailed example of where SEL-2505s were used to connect two protectionpanels at Springfield and Muldersvlei s/s.

4.6 Cost Analysi s

The following section provides a cost comparison when connecting two substations with either a fibreoptic modem or with a BME. The designs will be based on the configurations illustrated in the previoussections and the cost analysis will be based on the provision of the following services over a five yearperiod.

The maintenance cost is estimated as 12% of the unit cost per annum with 2.5% increase per annumover the 5 year period. The first option of having two data circuits (1 RS-232 + 1 X.21) and the secondof having six data circuits (5 RS-232 + 1 X.21) will be analysed.

Option 1:

1 x X.21 for supervisory (50km data circuit)

1 x RS-232 for protection (50km data circuit)

1 x PAX telephone for metering

1 x PAX telephone for voice telephone

Option 2:

1 x X.21 for supervisory (50km data circuit)

5 x RS-232 for protection (50km data circuit)

1 x PAX telephone for metering

1 x PAX telephone for voice telephone

optic fibreRS-232 RS-232

Relay Relay

Site B Site A

SEL-2505

RS-232

optical

SEL-2505

RS-232

optical

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4.6.1 BME Solut ion

Figure 13: Implementation using a BME

The upfront project cost of installing a BME3630 with 1 RS-232 circuit at a substation is R108 300(incl. VAT) as quoted by Eskom Telecommunications. This cost includes the OLTE and cabinet, aswell as maintenance costs.

option 1 1 RS-232 + 1 X.21 R 108,300.00option 2 5 RS-232 + 1 X.21 R 2,166.00

The maintenance cost cannot be separated from the upfront costs as it is included in the service levelagreement.

4.6.2 OS308M Solu tion

4.6.2.1 Option 1: 2 data circui ts

Item Descr ip tion Quanti ty Unit cos t Total

LL308M 8 channel mini mux 2 R 13,440.00 R 26,880.00LL3081R RS-232 card 2 R 1,696.00 R 3,392.00LL3081X X.21 card 2 R 1,696.00 R 3,392.00

LL3081Ttelephone (2 wire) linecard telephone side 2 R 2,112.00 R 4,224.00

LL3081Etelephone (2 wire) linecard exchange card 2 R 1,632.00 R 3,264.00

R 41,152.0020% Eskom discount R 8,230.40V.A.T. R 4,609.02

total upfront R 37,530.625 year maintenance R 23,672.79

TOTAL COST R 61,203.42

optic fibreBME

X.21

RS-232

2W2W

RS-232X.212W

2W

Site A Site B

BME

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Item Descr ip tion Quanti ty Unit cos t Total

LL308M 8 channel mini mux 2 R 13,440.00 R 26,880.00LL3081R RS-232 card 10 R 1,696.00 R 16,960.00LL3081X X.21 card 2 R 1,696.00 R 3,392.00

LL3081Ttelephone (2 wire) linecard telephone side 2 R 2,112.00 R 4,224.00

LL3081Etelephone (2 wire) linecard exchange card 2 R 1,632.00 R 3,264.00

R 54,720.0020% Eskom discount R 10,944.00

V.A.T. R 6,128.64

total upfront R 49,904.645 year maintenance R 31,477.82


4.6.3 FOX512 Solu tion


Descript ion Quantity Unit cost Total

8 channel mini mux 2 R 26,614.00 R 53,228.004 RS-232 and/or X.21interfaces 2 R 11,507.00 R 23,014.0012 port exchange sidetelephone card 1 R 9,426.00 R 9,426.0010 port subscriberside telephone card 1 R 11,879.00 R 11,879.00

Optcal 8Mb/s1xopt.(o), 4xel.(e)1300nm 2 R 17,653.00 R 35,306.00

R 132,853.00V.A.T. R 18,599.42total upfront R 151,452.425 year maintenance R 95,530.04


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Item Descript ion Quantity Unit cost Total

FOX512 core 8 channel mini mux 2 R 26,614.00 R 53,228.00DATAx asV35

4 RS-232 and/orX.21 interfaces 4 R 11,507.00 R 46,028.00

EXLAN342POTS IF

12 port exchangeside telephone card 1 R 9,426.00 R 9,426.00

SUBH 1010 port subscriberside telephone card 1 R 11,879.00 R 11,879.00

TUPON397

Optcal 8Mb/s1xopt.(o), 4xel.(e)1300nm 2 R 17,653.00 R 35,306.00

R 155,867.00V.A.T. R 21,821.38totalupfront R 177,688.385 year maintenance R 112,078.62


4.6.4 SEL Solut ion

It should be noted that the SEL option only caters for RS-232 (ie no X.21 or telephony is available)therefore a full costing comparison will not be done.

Table 2: SEL transceivers with their respective ranges and prices

Modem Range Unit pric e Pair pric e

SEL-2800 500m R 840.18 R 1,680.36

SEL-2810 500m R 1,089.84 R 2,179.68

SEL-2812 1.2 4km R 2,055.42 R 4,110.84

SEL-2814 1.2 4km R 2,055.42 R 4,110.84

SEL-2815 6 15km R 2,978.82 R 5,957.64

SEL-2829 23km R 5,759.28 R 11,518.56SEL-2830 80km R 8,064.36 R 16,128.72

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4.6.5 Stand Alone Solut ion (from ADD)

This option consists of separate units to implement each service.

Item Descript ion Quantity Unit cost TotalLL400 RS-232 card 2 R 5,760.00 R 11,520.00

LL21001 channel X.21fibre interface 2 R 7,332.00 R 14,664.00

LL300E

1 linetelephoneextenderexchange side 0 R 3,188.00 R 0.00

LL300T

1 linetelephoneextendertelephone side 0 R 3,304.00 R 0.00

LL304E

4 linetelephoneextenderexchange side 1 R 7,812.00 R 7,812.00

LL304T

4 linetelephoneextendertelephone side 1 R 9,796.00 R 9,796.00

R 43,792.0020% Eskom discount R 8,758.40

V.A.T. R 4,904.70total upfront R 39,938.305 year maintenance R 25,191.46


The OS308M appears to be the most cost effective option when a full complement of services isneeded.

The analysis shows that when 2 data circuits are needed the OS308M is cheaper than the BME but ifmore data circuits are needed the BME becomes more cost effective, as illustrated in Figure 14 below.

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R 0.00

R 50.00

R 100.00

R 150.00

R 200.00

1 2 3 4 5 6

T h o u s

a n

d s

number of data ccts

c o s

t

BMEOS308M

Figure 14: The OS308M is cheaper than the BME when less than three data circu its are installed

4.7 Advantages and Disadvantages

4.7.1 BME

The option of using a BME has the following advantages:

All telecomms services are available

Allows one to see the network at NMC level

Extension of existing BME network

Usage common in Eskom Telecomms

Costs include maintenance provided by Eskom Telecomms IP ready

However, the following disadvantages must also be considered:

Very costly

Higher installation costs

Hidden costs associated with network management systems

Require OLTES

Offer much larger capacity that is needed by most substations

4.7.2 Fibre Optic Transceivers

The option of using a Fibre Optic Transceivers has the following advantages:

Reduces cost of PLC replacements.

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Lower installation costs.

Offer cost effective solution at smaller spurs type substations.

The disadvantages associated with the Fibre Optic Transceivers are:

Do not provide network supervisory & management offered by BME

The related advantages and disadvantages of specific technologies are shown in the Table below.

Table 3: The advantages and disadvantages of the alternative interfaces investigated

Produc t Advantages Disadvantages

OS308M Supplies all required circuits, i.e. RS-232, X.21 & PAX has no IP interface for futureneeds

FOX512 Has IP for future not cost effectiveSupplies all required circuits, i.e. RS-232, X.21 & PAX

SEL Single circuit RS-232 solutions that are cost effectiveper circuit no solution for X.21 or telephony

LL Standalone cost effective single circuit solutions

becomes expensive whenmultiple telecomms services arerequired

4.8 Conclusion

Fibre optic transceivers and multiplexers can provide a more cost effective telecomms solution overBME for interfacing to substation equipment under certain conditions.

The OS308M in particular provides a cost reduction per unit compared to the BME, while offering thesame services, however the cost analysis shows that this is only the case when one or two datacircuits are installed. When more are needed the BME becomes the cheaper option.

The stand alone fibre optic transceivers provide a cost effective solution when upgrading an existingsubstation and only certain services need to be added.

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4.9 Recommendations

Figure 15: This flowchart can be used to determine which units are most s uited to a specificrequirement.

Newsubstation withfibre comms?

Supervisoryonly?

Singlecct?SEL

transceiver

IPrequired?

LL400(4 channel

mux)

Telephonyonly?

LL2100(single X.21)

LL304E+

LL300T

LL300T

Teleprotec-tion only?

Singlecct?

Existingsubstation

yes

yes

no

no

no

no

no

yes

yes

yes

X.21RS-232

telephony

no

2 or moreRS-232?

OS308M

FOX512

no

yes

yes

BME

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Annex A

Case Study 1: Bluedowns - Firgrove Fibre Optic Communications usingSEL-2829F

Figure 16: The Bluedowns-Firgrove baud rate was improved from 200 baud to 9600 baud usingthe SEL-2829F

A 1.5m RS-232 cable connects the Bluedowns ERTU to the SEL-2829F single mode fibre optictransceiver. The SEL-2829F is powered from the ERTU via RTS [pin 7 on DB9 connector] from the+12VDC pin [pin 7 on the 10 way connector]. The SEL-2829 at Bluedowns is set as a DTE device .The pin outs for the cable are provided in Figure 17 below.

The SEL-2829F supplies 14dB optical power. The line length is 9.6km. The attenuation per km for a9.3um fibre is 0.4dB/km yielding 4.9dB loss. The 2 sets of connectors at each fibre patch panel add4dB of attenuation, totalling 8.9dB, leaving 5.1dB optical power available .

A 10m single mode duplex fibre optic patch lead provides the connection between the SEL-2829F andthe fibre patch panel at Bluedowns s/s. Fibre number 10 and 11 are used for the Bluedowns-Firgrovecomms solution. Data is transmitted through fibre number 11 from Bluedowns to Firgrove andtransmitted though fibre number 10 from Firgrove to Bluedowns. A 40m single mode duplex fibre opticpatch lead provides the connection between the SEL-2829F and the fibre patch panel at Firgrove s/s.

The SEL-2829 at Firgrove s/s is also configured as a DTE device . It converts the optical signal to backinto an electrical signal that is carried to the RS-422 card via a 1.5m RS-232 cable. The SEL-2829Fpower requirements could not be sourced from the linking cable to the RS-422 card, since the RS-422card itself in one operational mode draws power from the mentioned cable. The cable therefore hadto be modified to provide the power needed by the SEL-2829F . This is illustrated in Figure 18. TheRS-422 card is powered directly from the Firgrove ERTU.

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The RS-422 signal from the RS-422 card is carried to the BME via an X21 cable specified in EDNSProject documents: ERTU X.21 project. The signal is then routed to the control centre at Bellvillewhere it is DSPed with the Cisco Group on Line 30.

ERTU [QC] - 10way connector SEL-2829F DB9-M [DCE] [DTE]

1 5

2 2

3 3

4

5 8

6 1

7 7

Figure 17: pin outs for the RS-232 cable at Bluedowns s/s

RS-422 - 10way connector SEL-2829F DB9-M [DTE] [DTE]

1 5

2 3

3 2

4

5 8

6 1

7 7

8

Figure 18: pin out s for the RS-232 cable at FIrgrove s/s

The BME configurations for the X.21 port are:

Full duplex

Asynchronous

Speed - 9k6

Even parity

DCE

Stop bit 1

8 Bits

C on (control)

I on (indicator)

Note that the BME is positive earth.

Connected internally

Gnd Gnd

Tx Rx

Rx Tx

RTS

CTSDCD DCD

CTS

RTS+12VDC

Connected internally

Gnd Gnd

Tx Rx

Rx Tx

RTS

CTSDcd DCD

CTS

RTS+12VDC

-12VDC

Loop back Jumper

RS-422 PowerConnector

+12VDC -12VDC Gnd

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RS-232 - 25 pin SEL-2829F DB9-M

[DCE] [DTE]

1 7

2 3

3 2

4 5

5 8

6 1

Figure 20: pin ou ts for the RS-232 cable at Oribi s /s

The BME conf igur ations for t he RS-232 port are:

Full duplex

Asynchronous

Speed - 9k6

Parity None

DCE

Stop bit 1

8 Bits

RTS - On

CTS Off (not used)

DSR - Off (not used)

DTR - Off (not used)

Note that the BME is positive earth.

Gnd Gnd

Tx Rx

Rx Tx

RTS

DCD

CTS

12V

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Annex C

Case Study 3: Muldersvlei - Springfield Fibre Optic Communicationsusing SEL-2505

The Muldersvlei Springfield PLC replacement project is an example of where the SEL-2505 is useddirectly over fibre to connect the protection schemes at both substations.

Figure 21: The SEL-2505 connects two protection panels over fibre

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Annex D

Case Study 4: Muldersvlei Stellenbosch PLC

Figure 22: The SEL-2505 at Muldersvlei s/s communicates with the SEL-321 prot ection relay atStellenbosch s/s using the Mirrored Bits 8 communications pr otocol.

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Annex E

Impact assessment

Impact assessmentDocument title: Substation Interface Fibre Optic Design gu ideDocument no: 34-327 Revision no: 0

Ac ti vi ty Detai lWhat training is required to implement this document?(e.g. Awareness training, practical / on job, module.)

N/A

Who will require training? (State designations.) N/AWhat prerequisites are needed for students? N/AWhat equipment will be required for training? (Computers etc.) N/AWhat special tools will be required for training? N/A

What special requirements are needed for the trainer? N/ATime period for training to be completed? N/AWhat special tools / equipment will be needed to be purchased by the Region to effectivelyimplement?

N/A

Are there stock numbers available for the new equipment? N/ADoes the document affect the budget? N/ATime period for implementation of requirements after training is completed? N/ADoes the Buyers Guide or Buyers List need updating? N/AWhat Buyers Guides have been created? N/AWas Training & Development consulted w.r.t training requirements? N/AWere the critical points in the document determined? N/AIs any training material available on the subject in this document? N/A

Total implementation periodTotal training costTotal cost of tools / equipmentTotal cost involved

Comments:

Assessment Compiled by: Recommended by (Functional Responsibility):Name: Fadeelah Kenny Name: R WestwoodDesignation: Assistant Engineer Designation: Telecoms SC ChairmanDept: EDNS Western Region Dept: TCM Eastern RegionDate: 11 October 2006 Date: DD/MM/CCYY

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