Transcript New Line differential relay 7SD52 with serial communication

Universal Differential relay 7SD610
87 Universal differential relay
- For line / cables
- with transformers in the protection
zone
With secure digital communication
- Fibre optic cables
- Communication networks
- Digital telefon network / telefon cables*
* In preparation
7SD610
Protection and Substation Control
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Protection and communication come together
Three benefits of the 7SD610
 Differential protection for the
universal use with easy to handle settings
Two line terminals, Less CT-requirements
Handles transformers and compensation coils within
the protection zone
Tripping time less than one period
 Additional functions
Backup (parallel running) or emergency O/C - function (3 stages)
Breaker failure protection, Overload protection,
Switch on to fault feature, 4 fast remote signals, Intertrip function
Supervision of the communication link, Bus-wire supervision
 Direct and modular connection to fibre
optic and digital communication
networks
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Application - Fibre optic connection
Direct connection with fibre optic (FO) cables
- Offers high speed tripping (16 ms)
- Flexible plug in modules for different fibre typ or distance
FO
Distance
FO-cable
Connector
820 nm, 1,5 km
820 nm, 3 km
Multimode
62,5/125 um
ST
ST
1300 nm, 10 km
1300 nm, 35 km
Monomode
9/125 um
ST
FC
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Application - Digital communication network
Connection via a communication system with multiplexers
- Automatic delay time measurement (adaptive correction from 0 ms - 30 ms)
- Immediate detection of switch-over conditions of communication routes
- Communication addresses,
Synchonous electrical interface
X.21 (64/128/512 kBit/s) or G703.1 (64 kBit/s)
E
O
Communicationsystem
820 nm, 1,5 km
Protection and Substation Control
O
E
Communication
converter
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Application - Leased telefon line
Leased telefon line (standby or dial-up)
- 2 wire telefon cable (max. 8 km)*
E
O
Twisted telefon pair
max. 8 km (5 miles)
O
E
820 nm, 1,5 km
Communication
converter
* In test
Protection and Substation Control
5 kV insulation
integrated
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Applications Line or cable with different CT - ratios
400:5, 10P10, 10VA, kAlf = 59, k = 50
VT option
Not required
for diff. function
87L
50/51
50 BF
49
600:1, 5P20, 20 VA, kAlf = 130, k = 33,3
20 kA
IK,max
k= ___
IN,CT
- Mismatch of the CT ratio of 1:8 allowed, 1A or 5A input settable in the relay
- CT datas / errors are set in the relay
and automatically considered in the restraint current calculation
- CT-requirement: kAlf for the local CT must be greater then k (kmin = 30)
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Application Transformer and line in the protection zone
20 MVA, 110 kV/20 kV, Yd1
10P10, 10 VA, 200:1
10P10, 10 VA, 500:5
1 mile
87T
50/51
50 BF
49
trip
command
- Settings for the transformer datas in each relay
with vector group matching, ratio adaption and zero sequence elimination
- Differential setpoint is rated to the nominal current of the transformer
- Inrush restraint with second harmonic included (time limit for Crossblock)
High set element for immetiate trip (16 ms) through heavy fault currents
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Scope of functions / Hardware options
Scope of functions
- Fast high set element
IDiff>>. Current summation.
- Sensitive trip stage with
vector summation IDiff>
- Autoreclosure 1/3 pole
- Communication features
- Commissioning aid
- Overload protection
- Backup-/emergency
overcurrent
- Breaker failure protection
- Switch on to fault protection
- 4 remote commands
- Intertrip (also from external)
- User defined logic
- Exact time tagging
Relay Hardware
Options for the Protection Interface
O
1/3 *19´´
- 3Iph, and IE
-4U
- 7 binary inputs
- 5 trip contacts
- 1 alarm contact
- 1 Protection interface
- System interface (option)
- Rear DIGSI interface (option)
- Time synchronisation interface
for GPS
STconnector
820 nm
1,5 / 3 km
multimode
internal
O
STconnector
1300 nm
10 km
monomode
internal
O
FCconnector
1300 nm
35 km
monomode
internal
820 nm
1,5 km
STconnectors
E
O
Electrical
X21
G703.1
interface
External converter
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Modular hardware concept with Plug in modules
Plug in
modules
Protection interface 1
Remote line end
Port D
Synchronous N x 64kB/sec
Subst. control interface
Communication modules
RS485 or RS232
Interfacemodul 2
RS485 or FO
Substation control
Available Protocols
IEC - standard
Service-interface
DIGSI
local
Browser
Interfacemodul 1
RS485
RS232
local-PC
interface
Serial time
sync. input
Protection and 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 differential protection (2 terminals).
Tripping time of 16 ms with fast trip stage.
 Fundamental vector comparison for the sensitive
trip stage. Detects even high resistive faults under full load.
 Dynamic increase of sensitive differential setpoint during
switch-on of long cables (settable time)
 CT saturation detector. Increase of restraint current if CT-
saturation is indicated by the measured fault currents.
 Phase selective intertrip within 20 ms (normally not required)
 Settable delay time for single phase faults
(special feature for inductive compensated networks)
 Inrush detection with 2nd harmonic. Undelayed trip for
heavy fault currents.
 Vector group matching and zero sequence current
elimination included with transformer option
 Lockout function
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Adaptive differential relaying
Consideration of CT- errors and comms-errors
I1
I2
IDiff
Tripping
area
I2
Restraint
area
I1
IDiff>
Current
summation:
Max. error
summation:
Max.
measurement
error (e) due to
linear
CT - error
IRest
IDiff = I1 + I2 + I3
IRest = IDiff> + eCT1 * I1 + eCT2 * I2 + Sync.error
Trip, if diff.current exceeds the estimated error (=restraint)
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Settings for CT - parametrer
C.t. Parameter
c.t. e.g. 5P20, 10VA
% tolerance at ALFN
ALFe = ALFN
Pi + PN
Pi + PB
With PB = Pleads +
Prelay (0,1 VA)
Thumb rule:
Ri  0,1...0,2 * RN
RN at 10 VA  10
=> Ri  2 
ALFe
2 VA + 10 VA
=
ALFN
2 VA + 1 VA
= 4
Resulting Relay Parameter:
• effective ALF / nominal ALF = 4 (calculation as per above)
• IEC 44 -1:
tolerance in load area up to ALFe / ALFN : 1% with 5P, 3% with 10P c.t.s
total error at accuracy limit nN = 5% with class, 5P and 10% 10 P
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Approximation of CT-tolerance
Basis for the restraint current calculation is the estimated max.
measurement error of the CT
IDiff
I1
Fault current tolerance
Tolerance of
a real CT
Load current tolerance
ALFe / ALFN • IN,c.t
I1
: parameter 7SD610, 7SD52
Example: 10P10, eload < 3%, eFault at k_ALFN = 10%
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Restaint current calculted by the relay
from the CT-datas
I1
I2
Both CT´s: 400:1, 10P10
IC=50 A
eLoad = 5%
eFault = 10%
kAlf / kAlf,N =1
eLoad = 5% (3% + 2% safety magin)
eFault = 10%
kAlf / kAlf,N =2
e
e
10%
10%
5%
5%
1
2
I/IN,CT
I/IN,CT
Setting for I_Diff>: IDiff> = 2,5*IC / IN,CT = 125 A
Restraint current calcuation by the relay (adaptive):
I1 = I2 = 200 A:
IRest = IDiff> + 0,05*206 A + 0,05*200A = 125 A + 20 A = 145 A (=0,36)
I1 = I2 = 600 A:
IRest = IDiff> + 0,1*600A + 0,05*600A = 125 A + 90 A = 215 A (=0,53)
I1 = I2 = 1000 A:
IRest = IDiff> + 0,1*1000A + 0,1*1000A = 125 A + 200 A = 325 A (=0,82)
1
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Values displayed in DIGSI 4 with 50% load
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Grafical view in a Browser screen with 50% load
Currents (amount / phasor)
Differential and restraint values
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Values displayed in DIGSI 4 with 150% load
Protection and Substation Control
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Grafical view in a Browser screen with 150% load
Currents (amount / phasor)
Differential and restraint values
Protection and Substation Control
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Values displayed in DIGSI 4 with 250% load
Protection and Substation Control
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Grafical view in a Browser screen with 250% load
Currents (amount / phasor)
Differential and restraint values
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To complete the 7SD610
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)
 Breaker failure protection
 User definable logic and control functions
(AND, OR, NOT, Timer, Flip-Flop)
 4 remote commands via binary input or logic inputs
 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
Fault records are exactly time synchronized at both line ends
 Fast monitoring functions
Fast broken wire supervision, Current symmetry
 Switch On to Fault protection with breaker monitor
 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
- 32 bit CRC-checksum offers extreme high security
 Permanent supervision of the data transmission
 Microsecond resolution time tagging of the telegrams
- Exact time synchonisation between both line terminals
 Two settable alarm levels
- Data disturbance (detects gaps in a telegram stream)
- Complete data failure (interruption of the data transmission)
 Measurement and compensation of transmission duration
- max. 30 ms (adaptivily)
 Measurement of the availability of the comms link in per/min, per/h
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
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Plug and Protect
Commissiong helps and test features
 Transmission time duration measuement (delay time)
Mean value of transmit and receive direction
 Test loop facility included
- Helps to test the fibre or comms-link
 Absolute value and phase measurement of currents
IL1_2
Local measurement of angle between IL1, IL2, IL3
,Angle between currents of each phase from remote
Phi1->2
IL1_1
IL2_1
 CB test trip
 Counting of faulty telegrams in % per minute and hour
 Activation of binary inputs and outputs by operating
IL2_2
software DIGSI 4.
 Display of the status of binary inputs
IL3_2
IL3_1
 Test telegrams to the substation control system
 Test mode which can be activated via DIGSI, bin.input
- Remote diff. is blocked from the local side
 Commissiong mode (diff. runs but doesn´t trip)
 Complete commissioning support with DIGSI 4 and
browser based PC-software
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Browser view - Startpage with overview
Web-Server is running in the device.
Homepage of the device settable with DIGSI (e.c. http://140.141.255.150)
Serial access to the device via a standard Dial up Network under WINDOWS(R)
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Browser view - Local and remote measurements
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Browser view: Diff. and restraint measurements
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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
Exact time synchronized fault records from both line ends
Protection and Substation Control
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t/s
Prefault and fault conditions in the vector diagram
Protection and Substation Control
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