The “Power Swing Logic (PSLPSCH)” is a complementary function to Power Swing Detection (ZMRPSB) function. It provides possibility for selective tripping of faults on power lines during system oscillations (power swings or pole slips), when the distance protection function should normally be blocked.
For more detailed information on “Power Swing Logic (PSLPSCH)”, refer to ABB, Relion 670 Series manuals.
Start from Earth Fault Protection in
forward or reverse direction
STZMPSD
BOOLEAN
0
Operation of Power Swing Detection
external characteristic
CACC
BOOLEAN
0
Overreaching ZM zone to be accelerated
AR1P1
BOOLEAN
0
Single pole auto-reclosing in progress
CSUR
BOOLEAN
0
Carrier send by the underreaching
power-swing zone
CR
BOOLEAN
0
Carrier receive signal during power
swing detection operation
PSLPSCH Output signals
PSLPSCH Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip through Power Swing Logic
STZMURPS
BOOLEAN
Start of Underreaching zone controlled by PSL to be used
in configuration
BLKZMUR
BOOLEAN
Block trip of underreaching impedance zone
BLKZMOR
BOOLEAN
Block trip of overreaching distance protection zones
CS
BOOLEAN
Carrier send signal controlled by the power swing
PSLPSCH Group settings (basic)
PSLPSCH Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Off
On
–
–
Off
Operation Off / On
tDZ
0.000 – 60.000
s
0.001
0.050
Permitted max oper time diff between
higher and lower zone
tDZMUR
0.000 – 60.000
s
0.001
0.200
Delay for oper of underreach zone with
detected diff in oper time
tCS
0.000 – 60.000
s
0.001
0.100
Conditional timer for sending the CS at
power swings
tTrip
0.000 – 60.000
s
0.001
0.100
Conditional timer for tripping at power
swings
tBlkTr
0.000 – 60.000
s
0.001
0.300
Timer for blocking the overreaching
zones trip
Logics & highlights
Simplified logic diagram – power swing communication and tripping logic
Control of underreaching distance protection (Zone 1) at power swings caused by the faults and their clearance on adjacent lines and other system elements
The “Automatic switch onto fault logic (ZCVPSOF)” is a function that gives an instantaneous trip when closing the breaker onto a fault. A dead-line detection check is provided to activate ZCVPSOF when the line is de-energized.
For more detailed information on “Automatic switch onto fault logic (ZCVPSOF)”, refer to ABB, Relion 670 Series manuals.
The “Power swing detection (ZMRPSB)” function is used to detect power swings and initiate block of all distance protection zones. Occurrence of earth-fault currents during a power swing inhibits the ZMRPSB function, to allow fault clearance.
For more detailed information on “Power swing detection (ZMRPSB)” function, refer to ABB, Relion 670 Series manuals.
The mho characteristics can be classified into Offset or Directional. The directional mho characteristics can be set to Offset, Forward or Reverse by the setting parameter DirMode. The offset mho characteristic can be set to Forward or Reverse or Non-Directional.
Phase selection with load encroachment, quadrilateral characteristic FDPSPDIS includes six impedance measuring loops; three intended for phase-to-earth faults, and three intended for phase-to-phase faults as well as for three-phase faults.
The difference, compared to the distance zone measuring function, is in the combination of the measuring quantities (currents and voltages) for different types of faults.
For more detailed information on “Phase selection, quad, fixed angle, load encroachment (FDPSPDIS)” function, refer to ABB, Relion 670 Series manuals.
Current conditions release of phase-earth measuring
elements
STPP
BOOLEAN
Current conditions release of phase-phase measuring
elements
STCNDZ
INTEGER
Start condition (Z< with LE and 3I0 E/F detection)
STCNDLE
INTEGER
Start condition (only LE and 3I0 E/F detection)
FDPSPDIS Group settings (basic)
FDPSPDIS Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
INBlockPP
10 – 100
%IPh
1
40
3I0 limit for blocking phase-to-phase
measuring loops
INReleasePE
10 – 100
%IPh
1
20
3I0 limit for releasing phase-to-earth
measuring loops
RLdFw
1.00 – 3000.00
Ohm/p
0.01
80.00
Forward resistive reach within the load
impedance area
RLdRv
1.00 – 3000.00
Ohm/p
0.01
80.00
Reverse resistive reach within the load
impedance area
ArgLd
5 – 70
Deg
1
30
Load angle determining the load
impedance area
X1
0.50 – 3000.00
Ohm/p
0.01
40.00
Positive sequence reactance reach
X0
0.50 – 9000.00
Ohm/p
0.01
120.00
Zero sequence reactance reach
RFFwPP
0.50 – 3000.00
Ohm/l
0.01
30.00
Fault resistance reach, Ph-Ph, forward
RFRvPP
0.50 – 3000.00
Ohm/l
0.01
30.00
Fault resistance reach, Ph-Ph, reverse
RFFwPE
1.00 – 9000.00
Ohm/l
0.01
100.00
Fault resistance reach, Ph-E, forward
RFRvPE
1.00 – 9000.00
Ohm/l
0.01
100.00
Fault resistance reach, Ph-E, reverse
IMinOpPP
5 – 500
%IB
1
10
Minimum operate delta current for
Phase-Phase loops
IMinOpPE
5 – 500
%IB
1
5
Minimum operate phase current for
Phase-Earth loops
FDPSPDIS Group settings (advanced)
FDPSPDIS Group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
OperationZ<
Off
On
–
–
On
Operation of impedance based measurement
OperationI>
Off
On
–
–
Off
Operation of current based measurement
IPh>
10 – 2500
%IB
1
120
Start value for phase over-current
element
IN>
10 – 2500
%IB
1
20
Start value for trip from 3I0 over-
current element
TimerPP
Off
On
–
–
Off
Operation mode Off / On of Zone timer,
Ph-Ph
tPP
0.000 – 60.000
s
0.001
3.000
Time delay to trip, Ph-Ph
TimerPE
Off
On
–
–
Off
Operation mode Off / On of Zone timer,
Ph-E
tPE
0.000 – 60.000
s
0.001
3.000
Time delay to trip, Ph-E
FDPSPDIS Non group settings (basic)
FDPSPDIS Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 – 12
–
1
1
Selection of one of the Global Base
Value groups
highlights
Characteristics for non-directional, forward and reverse operation of Phase selection with load encroachment, quadrilateral characteristic FDPSPDIS
Characteristic of FDPSPDIS for phase-to-earth fault (setting parameters in italic), ohm/loop domain (directional lines are drawn as “line-dot-dot-line”)
The operation characteristics for FDPSPDIS at phase-to-phase fault (setting parameters in italic, directional lines drawn as “line-dot-dot-line”), ohm/phase domain
The characteristic of FDPSPDIS for three-phase fault (setting parameters in italic)
Characteristic of load encroachment function
Difference in operating characteristic depending on operation mode when load encroachment is activated
Operating characteristic in forward direction when load encroachment is activated
Operating characteristic for FDPSPDIS in forward direction for three-phase fault, ohm/phase domain
Rotation of load characteristic for a fault between two phases
General phase-selection logic diagram
Phase-to-phase and phase-to-earth operating conditions (residual current criteria)
Composition on non-directional phase selection signals
Composition of phase selection signals for reverse direction
Composition of phase selection signals for forward direction
The “Distance measuring zones quadrilateral characteristic (ZMQPDIS)” together with “Phase selection with load encroachment (FDPSPDIS)” has functionality for load encroachment, which increases the possibility to detect high resistive faults on heavily loaded lines.
For more detailed information on “Distance measuring zones quadrilateral characteristic (ZMQPDIS, ZMQAPDIS, ZDRDIR), refer to ABB, Relion 670 Series manuals.
The “Additional security logic for differential protection (LDRGFC)” can help the security of the protection especially when the communication system is in abnormal status or for example when there is unspecified asymmetry in the communication link. It helps to reduce the probability for mal-operation of the protection.
For more detailed information on “Additional security logic for differential protection (LDRGFC)”, refer to ABB, Relion 670 Series manuals.
The “High impedance differential protection, single phase (HZPDIF)” function can be used when the involved CT cores have the same turns ratio and similar magnetizing characteristics.
For more detailed information on “High impedance differential protection, single phase (HZPDIF)” function, refer to ABB, Relion 670 Series manuals.