process bus busbar protection –a stepping stone towards...

Process bus busbar protection – A stepping stone towards digital

substation

Terrence Smith – GE Grid Solutions

Busbar protection

Bay unit

Central unit

Bay unit

Bay unit

Bay unit

Bay unit

Bay unit

Bay unit

Bay unit

Proprietary Protocol

(Fibre optic)

CT, Isolator status, CB status,

Protection trip

Merging unit Bay unit

Central unit








IEC61850-9-2LE Sample values(Fibre optic)

Proprietary Protocol

(Fibre optic)


Protection trip

Merging unit

Central unit

Merging unit

Merging unit

Merging unit

Merging unit

Merging unit

Merging unit

Merging unit


Protection trip

IEC61850-9-2LE Sample values(Fibre optic)

• Conventional busbar protection

• Process bus busbar protection

• New process bus busbar protection

Busbar protection with redundant comm

• Conventional distributed busbar protection

• New process bus busbar protection

• The process bus busbar protection is not a new nor special application. It is simply the field proven concept of a distributed busbar protection system, using merging units, sampled values, GOOSE and IEEE 1588 as opposed to dedicated bay units and proprietary communications.

Busbar protection with redundant comm

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

Busbar relay(Main 1)

Process bus

Relay’s CPU

MMS buffered report, unbuffered report,

GOOSE

Port 1

Port 2

MU = Merging unit

EthernetSwitch

EthernetSwitch

100Mbps PRP 1Gbps PRP 100Mbps PRP

IEC61850-9-2LE Sample values, IEC61850-8-1 GOOSE,

IEC61850-9-3 PTP

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU

Port 1

Port 2

MU = Merging unit


GOOSE

1Gbps HSR 100Mbps PRP


IEC61850-9-3 PTP

• Busbar protection with PRP • Busbar protection with HSR

Main 1 & 2 Busbar protection

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2

MU = Merging unit

EthernetSwitch

EthernetSwitch



IEC61850-9-3 PTP

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2


Process bus

Relay’s CPU

Port 1

Port 2

MU = Merging unit


GOOSE



IEC61850-9-3 PTP


Busbar protection for larger substation

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

Busbar relay(Bay 1-18)

Process bus

Relay’s CPU


GOOSE

Port 1

Port 2


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2

MU = Merging unit

EthernetSwitch

EthernetSwitch



IEC61850-9-3 PTP

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2


Process bus

Relay’s CPU

Port 1

Port 2

MU = Merging unit


GOOSE



IEC61850-9-3 PTP


Total redundantMU

MUMU

MUMU

MUMU

MUMU

MUMU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

1Gbps HSR

1Gbps HSR


Process bus

Relay’s CPU


GOOSE


Process bus

Relay’s CPU


GOOSETwo independent 1Gbps HSR Rings

1Gbps HSR Ring for CT set 2

1Gbps HSR Ring for CT set 1

Redu

ndan

t MU

from

CT s

et 2

Redu

ndan

t MU

from

CT s

et 1

• Two HSR is NOT QuadBox, but two independent HSR• The relay has ability to detect the discrepancy

between the CT set 1 and CT set 2

Testing & Monitoring

Relay toolsuite software

network analyserssoftware

SV and GOOSE simulator

Current injection test set

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2

MU = Merging unit

EthernetSwitch

EthernetSwitch



IEC61850-9-3 PTPCT, Isolator status, CB status,

Protection trip

• Busbar communication is no longer a blackbox.

• Busbar testing can be simplified to test the merging units and busbar protection relay separately

Testing Process bus busbar

• IEC61850 simulation mode allows simulating SV and GOOSE messages to the network and only devices operating in simulation mode will subscribe to and use these simulated messages for testing purpose.

• IEC 61850 test mode allows the relay application to operate normally but all the relay outputs are blocked

Application in Conventional substation

• GPS or Absolute time synchronization for protection is not normally required in the conventional substation. Process bus busbar relay can have IEEE 1588 boundary clock capability.

• All merging units are synchronized to the same source, the busbar protection relay, the sampled values streams can be aligned and used for the low impedance busbar differential protection.

• This therefore allows the application of the same process bus busbar protection in a conventional substation without the need of a satellite clock or absolute time synchronization.

Stepping stone to digital substation

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU

MU


Process bus

Relay’s CPU


GOOSE

Port 1

Port 2


Process bus

Relay’s CPU

Port 1

Port 2

MU = Merging unit


GOOSE



IEC61850-9-3 PTP • Installing process bus busbar system in a conventional substation becomes the first step towards a fully digital substation

• Merging units are installed in all bays, along with a process bus network encompassing all bays.

• Future relay refurbishments for bays and zones will involve simply connecting relays to the existing network and merging units.

Stepping stone to digital substation

Bay

nBa

y ..

Bay

3Ba

y 2

Bay

1QuadBox

QuadBox Busbar relay(Main 1)

Process bus

Relay’s CPU

Port 1

Port 2

MU = Merging unit


GOOSE

Main 1 relayMU

Main 2 relay

Main 1 relayMU

Main 2 relayMain 1 relay

MUMain 2 relay

QuadBox

Main 1 relayMU

Main 2 relayQuadBox

Main 1 relayMU

Main 2 relayQuadBox


Process bus

Relay’s CPU

Port 1

Port 2


GOOSE



IEC61850-9-3 PTP

100Mbps HSR

IEC61850-9-2LE Sample values,IEC61850-8-1 GOOSE, IEC61850-9-3 PTP

Thank You

Questions?

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