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Practice Improvement Cooperation Innovation
NR Electric Co., Ltd.
Key technologies and project implementation
2www.nrelect.com
Overview
• Key technologies- Time synchronization technology
- Network traffic control
- Virtual circuit on-line supervision
• Case study- ECVT, OCT, MU, ICU
- IEEE 1588
3www.nrelect.com
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
4www.nrelect.com
• 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
5www.nrelect.com
• 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
6www.nrelect.com
• 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
7www.nrelect.com
• 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
8www.nrelect.com
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
9www.nrelect.com
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
10www.nrelect.com
• 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
11www.nrelect.com
• 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
12www.nrelect.com
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
13www.nrelect.com
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
14www.nrelect.com
• 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
15www.nrelect.com
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
Copyright 2014 NR Electric Co., Ltd. All rights reserved
www.nrelect.com