Practice Improvement Cooperation Innovation

NR Electric Co., Ltd.

Key technologies and project implementation

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Overview

• Key technologies- Time synchronization technology

- Network traffic control

- Virtual circuit on-line supervision

• Case study- ECVT, OCT, MU, ICU

- IEEE 1588

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Key technologies

• 1.How to ensure reliability of protection and control based on GPS clock in case of GPS system failures?

- Time synchronization technology

• 2.How to ensure reliability of protection and control in case of communication system failures?

- Network traffic control

• 3.How to simplify operation and maintenance?

- Virtual circuit on-line supervision

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• Issue :Problems of network sampling

- Network time delay is uncertain

- Extern GPS clock is used for synchronization

- Strong dependence on time synchronization network

- External clock failure will bring sampling out of step, then relay function will be influenced

Issue 1 and Solution

MU1

sensor sensor sensor sensor sensor sensor

Ia Ib Ic Ua Ub Uc

MU2

sensor sensor sensor sensor sensor sensor

Ia Ib Ic Ua Ub Uc

switch

IED1 IED2 IED3

clock

Sensor

Tra

nsm

itter

Merge Unit

Tra

nsm

itter

Rec

eive

r

tb

Dat

a Pr

oces

sing

tdtcta

LPF

, A/D

pr

oces

sing

Coi l transfer angle tolerance

Transmission delay of low pass filter andData processing

Transmission delay

MU delay of Reciving, processing and transmission

IED

te

SV delay of transimisstion

Rate delay of sensor

Synchronization clock

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• Solution: Compensating delay in switch

Issue 1 and Solution

- Switch pastes the delay which SV message flow through

- Relay minus the message delay time to realize synchronization

- Reduce or eliminate the dependence of synchronization network

RELAY△ T1 △ T2

Swi tch 1 Swi tch 2

t1 T2 t3 T4

△ T1=T2-T1△ T=△ T1

△ T2=T4-T3△ T=△ T1+△ T2

MU

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• Switch paste the delay time in the SV message

• Relay compensate this time delay

Issue 1 and Solution

Up : ∆t = ∆t0+…+∆tnDown: ∆t = ∆t0’ ∆t<1us

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• Time delay flow through switch

- Test result

Cascade BpsTime Delay （ u

s ）error （ ns ）

1 100/1000M 0.75~0.9 40

21000M 1.65~1.85 60

100M 1.6~1.8 60

31000M 2.45~2.7 80

100M 2.4~2.7 80

41000M 3.3~3.55 100

100M 3.2~3.55 100

Issue 1 and Solution

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Switch

IED2

Multicast Flow Managment

IN_1GOOSE

SV

OUT

IN_2

IED3

IED1

SV

GOOSE

SV

SV

GOOSEGOOSE

Switch

IED2

Multicast FlowManagment

IN_1GOOSE

SV

OUT

IN_2

IED3GOOSE

IED1

SV

GOOSE

DROP

SV

DROP

GOOSE

SV

• Issue

- Normal: Line relay

SV < 8M

GOOSE < 2M

- network congestion:

SV+GOOSE > 100M,

Important SV data is

dropped

Figure.1

Figure.2

Issue 2 and Solution

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Switch

IED2

Multicast FlowManagement

+Traffic Control

GOOSE

SV

OUT

IN_2

IED3GOOSE

IED1

SV

GOOSE

DROP

SV

SV

GOOSE

IN_1

• Solution

- SV+GOOSE > 100M, maybe IED1 GOOSE port net storm

happen

- GOOSE data is dropped by traffic control module in switch

before output

Issue 2 and Solution

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• Virtual circuit on-line supervision

• Validate online SV/GOOSE message with the SCD configuration

Issue 3 and Solution

MMS network

SV/GOOSE network

Process level

Station level

process level device

Record device

Station level device

ParseSCD/CID

Capture/parse message

analysing

Status out putExport CID

Bay level device

Import SCDMessage capture

Message capture

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• Generate the physical/virtual circuit dynamically according to the SCD configuration and on-line message

• Rapid positioning fiber or switch fault according to the IED’s communication failure

Issue 3 and Solution

Multicast group 2

Multicast group 1

IED 1IED 2IED 3

...

IED 6IED 7IED 8

...

IED 1

Switch 1

IED 2

Switch 2 Switch 3

IED 3

Virtual circuit topology Physical route topology

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Case Study : Dalv Substation

• First substation employing IEEE 1588, Service Date: Dec, 2009

- AIS, 2 *110/10kV transformers, 2 *110kV lines, 27*10kV bays

Future

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Case Study : OCT, ECVT, MU & ICU in Dalv

ECVT ECVT

EC

VT

OCT OCT

OC

T OC

T

ECTECTECT

ECVT ECVT ECVT ECVT ECVT ECVT

MU2MU1

MU

MU2MU1

MU2MU1

MU2MU1

MU2MU1

MU2MU1

MU2MU1

MU&IBC MU&IBC

MU MU MU MU MU

MU&IBC

IBC IBCIBC

Prot. &ICU Prot. &ICU Prot. &ICU Prot. &ICU Prot. &ICU Prot. &ICU

Prot. &IBC

110kV

10kV

EC

T MU

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• 110kV Switchyard- ECVT (Composited ECT/VT) & OCT used

- Dual MUs for 1 ECVT or OCT

- Single ICU for each breaker

- MUs in 110kV using IEC 61850-9-2, sampling rate: 4k sample/s, 50Hz

• 10kV Switchyard- ECT & ECVT used

- Single MU for each ECT or ECVT

- ICU integrated in MU in transformer outgoing bays

- ICU integrated in Relay in feeder bays

Case Study : OCT, ECVT, MU & ICU in Dalv

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Case Study : Communication Network in Dalv

Line1 Prot.

Trans.1 Prot.

Trans.2 Prot. Line2 Prot.

Bus Prot. Section Prot.

Line1 MUs Trans.1 MUsSection MUs

Trans.2 MUs

Line2 MUs

Line1 ICU Section ICU Line2 ICU

Trans. MU&ICU

10kV MU

Section Prot.&IBC

Bus Prot.

Feeder Prot.&IBC

Feeder Prot.&IBC

Feeder Prot.&IBC

Trans. MU&ICU

Trans. MU&ICU

10kV MU

10kV MU

110kV 10kV

Server/Workstation Gateway GPS Receiver

MMS, 10kV GOOSE, SNTP

SV (IEC 61850-9-2), 110kV GOOSE, IEEE1588

10kV SV

Thanks for Your Attention!

Version 2014

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