Transcript New Line differential relay 7SD52 with serial communication

Line differential relay 7SD52
Line differential relay for HV and
UHV lines/cables with a serial
communication interface
7SD52
Protection and Substation Control
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Protection and communication join together
Three benefits of the 7SD52
 Differential protection for the
universal use with easy to handle
settings
Two up to six line ends , for serial and parallel
compensated lines, handles transformers and
compensation coils within the protection zone,
tripping time approx. 15 ms with fast high set element
 Additional functions for very
long overhead lines and cables
Considation of local CT errors, charge
current compensation (step 2), increased setpoint
during switching-on conditions
 Direct and modular connection to fibre
optic and digital communication
networks
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Application for a three terminal configuration
Monomode fibre optic cable up to 10 km (1300 nm modul)
Monomode fibre optic cable up to 35 km with 1300 nm interface
Distance relay
7SA52
820 nm
Option:
max.
3 km
I-REGB
time
synchronisation
e
o
X21
G703.1
PCM
multiplexer
SDH
comms-network
PCM
multiplexer
o
e
Commsconverter
G703.1: 64 kBit
X21: N*64 kBit (1N8)
Protection and Substation Control
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Scope of functions / Hardware options
Scope of functions
- Fast high set element
with charge comparision
- Sensitive normal trip
stage with vector
summation principle
- Autoreclosure 1/3 pole
- Communication features
- Commissioning aid
- Overload protection
- Backup-/emergency
overcurrent
- Multiterminal extention
- Switch on to fault
protection
- 4 remote commands
24 remote signals
Options for the Protection Interface
Relay Hardware
O
3Iph, and IE
4U
8 binary inputs
16 contacts
1 - 2 protection interfaces
System interface
PC-interface
Time synchronisation
internal
O
STconnector
1300 nm
10 km
monomode
internal
½*19´´
16 binary inputs
24 contacts
O
24 binary inputs
32 contacts
FCconnector
1300 nm
35 km
monomode
internal
Option: 5 fast
trip contacts
1*19´´
STconnector
820 nm
1,5 / 3 km
multimode
820 nm
1,5 km
STconnectors
E
O
Electrical
X21
G703.1
interface
External converter
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Hardware option of the comms interfaces
Protection interface 2
Port E
Remote line end 2
Synchronous N x 64kB/sec
Plug in
modules
Remote line end 1
Protection interface 1
Port D
Synchronous N x 64kB/sec
Subst. control interface
communication modules
FO (Fibre optic) or RS485
or RS232
Available Protocols
IEC - standard
Interfacemodul 2
RS485 or FO
service-interface
Interfacemodul 1
RS485 or FO
or RS232
DIGSI
local
Browser
local-PC
interface
Serial time
sync. input
Protection and Substation Control
Substation control
DIGSI 4; also for
modem connection
and Browser
GPS-receiver
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Main board of the relay with it´s
Communication - Interfaces
Main processor
board of the relay
Sockets for the
communication
modules
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Main protection function
Features of the differential function
 Phase selective multiend differential protection
(2 - 6 ends). Tripping time 15 ms with fast charge
comparison protection.
 Fundamental vector comparison for the sensitive
trip stage.
 Dynamic increase of differential setpoint during
switch-on of long lines / cables (settable time)
 CT saturation detector (only 5 ms saturation free
time due to external faults necessary)
 Phase selective intertrip within 15 ms
 Settable delay time for single phase
faults (feature for inductive compensated
networks)
 Option: Inrush 2nd harmonic restraint with
vector group adaption. Undelayed trip for high
fault currents
 Optional Lockout function
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Adaptive differential relaying
Consideration of CT- errors and comms-errors
I1
IDiff
IN
I2
I3
Tripping
area
I2
Restraint
area
I3
I1
IDiff>
I1
Phasor summation:
Error summation:
IDiff = I1 + I2 + I3
I = IDiff> + Linear CT-error (
IK)
I
IN
+ Syncronization error
Trip, if diff.current exceeds the max. permissible error
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To complete the 7SD52
Additional functions
 3 stage backup- or emergency O/C protection
(Can be activated automatically if the communication with
the remote end is >50 ms interrupted)
 Overload function (Thermal replica with IOperation)
 User definable logic and control functions
(AND, OR, NOT, Timer, Flip-Flop)
 4 remote commands via binary input or logic inputs
(destination is adressable), 24 remote signals
 Operational values: currents, voltages, power,
delay time, differential current - remote end refresh 2 s
 Fault recorder with voltages, currents, binary traces
and differential and restraint current per phase
 Fast monitoring functions
(Fast broken wire supervision, Current symmetry)
 Switch On to Fault protection
 Option: Three pole and single pole AR (Single pole AR
during 2pole fault without earth possible, adaptive AR)
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Familiar with digital communication networks
Features of the relay to relay communication
 Synchronous data transmission by HDLC- protocol
 Permanent supervision of the data transmission
 Measurement and compensation of signal transmission time
(max. 20 ms)
 Counts number of invalid telegrams
Blocking the diff.protection if transmission failure rate is too high
 Settings for the data transmission
(N*64 kBit/s, N settable from 1 - 8, synchronous HDLC-protocol)
 Communication device addresses
(Protection devices are clearly assigned to a defined protection
section)
 Detection of reflected data in the loops in comms- network
 Step 2: Microsecond exact time synchronisation
via satellite (civil - IRIG-B)
(If signal transmission time depends on the transmission direction,
Online high resolution fault recorder)
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Ring and Chain topologie
Automatic change from
closed ring to chain, if
one connection is lost
or not available
side 2
side 2
I2
side 3
I2
Connection to
side 3
I3
I3+I1
I2
I1+I2
I1
other diff. relays
I3
I3
I1
I3+I1
I1+I2
side 1
Closed ring
Protection and Substation Control
side 1
Partial current summation
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Topologies: Chain topology for max. 6 line ends
1
PI1
PI1
2
PI2
PI1
3
PI2
PI - Protection Interface
PI1
6
PI1
PI2
Protection and Substation Control
5
PI1
PI2
4
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Topologies: Ring topology, 6 line ends
1
PI2
PI1
2
PI2
PI1
3
PI1
PI2
PI2
PI1
6
PI1
PI2
5
PI1
PI2
4
PI - Protection Interface
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Plug and Protect
Commissiong helps and test features
 Signal transmission time
Mean value of transmit and receive direction
 Generation of signals for switching test loops
Sending of defined telegram patterns looped back to the
receive input of the transmitting relay
IL1_2
 Absolute value and phase measurement of currents
Phi1->2
IL1_1
IL2_1
Local measurement of angle between IL1, IL2, IL3
,Angle between currents of each phase from remote
 CB test trip
IL2_2
 Counting of faulty telegrams in % per minute and hour
 Activation of binary inputs and outputs by operating
software DIGSI 4.
IL3_2
IL3_1
 Display of the status of binary inputs
 Test telegrams to the substation control system
 Automatic Switchover from 3 line to 2 line end
configuration (while commissioning 3rd line end)
 Complete commissioning support with DIGSI 4 and
browser based PC-software
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Browser based commissioning aid
Protection and Substation Control
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Comprehensive fault analysis with DIGRA 4
I/A
1,50
1,00
0,50
-0,075
-0,050
-0,025
0,000
0,025
0,050
0,075
0,100
0,125
t/s
-0,00
-0,50
-1,00
-1,50
-2,00
iEe
iL1
iL2
iL3
U/V
80
60
40
20
-0,075
-0,050
-0,025
0,000
0,025
0,050
0,075
0,100
0,125
0
-20
-40
-60
-80
uL1
uL2
uL3
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t/s
Prefault and fault conditions in the vector diagram
Protection and Substation Control
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