38.lfdc relay testing with f6150-1

Knowledge Is PowerSM

Apparatus Maintenance and Power Management for Energy Delivery

Brief Introduction for Automated Testing of LFDC101/102 Relay

Kamin DaveManager – Marketing & Protection Applications

South Asia & Middle EastDOBLE ENGINEERING COMPANY, INDIA

[email protected]



Protection Relay Testing:

Testing of LFDC101/102Relay by using F6150



Relay Details: LFDC101/102

High speed directional comparison protection using signaling channel

Distance Zone Backup

Switch On to Fault Protection

Voltage Transformer supervision




Operating time of Directional comparison unit is 12 to 15ms

Operating time of Distance zone (Backup) is adjustable



Relay Details: Measuring Principle

RA RBCommunication(Signaling betn two relays)




Carrier scheme supervised by Mho elementIf there is fault in Line & fault impedance falls under preset value then Both relays will send carrier signals to each otherScheme is normally applied as a primary protection for short line length (<5km)




F1 External fault (F1) in Forward direction

IA = - IBIA + IB = 0




F1

External fault (F1) in Forward direction

IA

IB




F1

External fault (F1) in Forward direction

ZA

ZB

ZF

ZF

Forward Direction

Reverse Direction




F1 External fault (F1) in Reverse direction

Both currents are zero in Radial feeder IA = 0IB = 0




External fault (F1) in Reverse direction

ZA ZB

ZFZF

Reverse Direction

S1 S2

RA RB

F1

IA IB




F1 Internal fault (F1) in Forward direction

IA

IB




F1 Internal fault (F1) in Forward direction

ZA

ZBZF

ZF




ZA

ZB ZF

ZF

RF

RF

Kn = 0.75

Internal Fault: Fault measurement for Phase to Ground faults

Kn = 0.75

R in Ohms

X in Ohms

R in Ohms

X in Ohms

RA

RB




Internal fault (F1) in Forwarddirection& fault feeding is from End A

F1 F2

Internal fault (F2) in Forwarddirection& fault feeding is from End B




Internal fault (F1) in Forward direction & Fault feeding is from source “S1”

ZA ZB

ZFZF

S1RA RBF1

RC RDZC ZD

ZF

ZF

Relay “RC” will operate on Back Zone

IA IB




ZA

ZB ZF

ZF

Relay Operating time faster (12 to 15ms) when carrier signal receive & impedance falls under preset value during internal faults

R in Ohms

X in Ohms

R in Ohms

X in Ohms

RA

RB




ZA

ZB ZF

ZF

Relay Operating time based on time delay set in relay when carrier signal NOT receive & impedance falls under preset value during internal faults

R in Ohms

X in Ohms

R in Ohms

X in Ohms

RA

RB



LFDC Relay for Line1


220KV GETCO S/S



220KV GACL S/S



PLCC Cabinet



Communication through PLCCPLCC: Power Line Carrier Communication (PLCC) is used to communicate devices between substations.The Audio frequency is carried out by a carrier frequency and the range of carrier frequency is 24kHz to 500kHzWave trap: It is an inductor of rating in mili henry. It is connected in series with the power transmission line. It blocks the high frequency carrier waves (24kHz to 500kHz) and let Power waves (50Hz – 60Hz) to pass through.



Communication through PLCCCoupling Capacitor: It provides low impedance path for carrier energy to H.V. line and blocks the power frequency circuit by being a high impedance path.HF Cable: It is used to carry to signal from PLCC cabinet to switchyard



Communication through PLCCPLCC Cabinet: It indoor equipment. It is divided in two parts;

TransmitterReceiver



Communication through PLCCWave trap or Line trap



Carrier send Carrier receive

Carrier receive Carrier send

Communication through PLCC

Exchange SignalsBoth are thinking same

Scheme Stable on External Faults

220KV GETCO S/S 220KV GACL S/S

F1RA RB

Delta V = 0Delta I = 0IA - IB = Delta IIA = IB VA - VB = Delta VVA = VB

IA IB




Carrier receive Carrier send


Scheme Operates on Internal Faults


F1RA RB

Delta V = ?Delta I = ?IA - IB = Delta IIA not equal to IBVA - VB = Delta VVA not equal to VB

Exchange SignalsBut both are thinking in different

IA IB




Carrier NOT receive Carrier send


Scheme Operates on Internal Faults


F1RA RB

Delta V = ?Delta I = ?IA - IB = Delta IIA not equal to IBVA - VB = Delta VVA not equal to VB

No Exchange of SignalsBut both are thinking in different

IA IB




Relay Settings:Location: GETCO and GACL Ends, DahejLine length: 1.5kmLine voltage: 220kV (Line1)• Z = 0.2 Ohms• tZ = 0.2s• Line Angle = 78 Deg.• Kn = 0.75



Test Equipment

• Make : DOBLE

• Model : F6150

Software

• F6TesT Version 2.19-1065



VA

VB

VC

I1

I2

I3

Relay

Test Circuit:

Source Configurations:3V X 3I

CT Inputs



• Zone Time Test during carrier signal received from other end

• Zone Time Test (Distance Zone Backup)

• Zone Characteristic Test

• SOTF Test

• Stability Test of scheme

Test Conducted:



Zone Time Test during Carrier signal received

from other end

Use “ZTime” Module



Location Level

Right click on Mouse & click on “Append” and create new Location



Relay Level

Right click on Mouse & click on “Append” and create new Relay



Relay Parameters

Click on “Add” button & select “Impedance” function



Click here & then click on “New Zone” button



Select “MHO” & enter relay settings



Click on “Yes”



Characteristic created for Ph-N fault



Characteristic created for Ph-Ph & 3-Ph faults



Click on “Yes”



Right Click on “Mouse” & Click on “Append” to create new Test plan



Right click on “Mouse” & click on “Append” to create new test module for testing



Select “Z-Time” Module from list



Press on “OK” & Create New Test Definition



Select characteristic from list



Enter Test current (i.e. 2.3A)

Select Test Method



Select Trigger (i.e. Open to Close)

Enter Prefault duration & Max. fault duration



Click Test points in R-X Plane for “Ph-Ph” fault



Right Click on check box

Green/Red Points areActual Points have been tested

Blue color shows;Expected characteristic

Line Angle

Relay operated in 12 to 13ms

Carrier signal received from other end on E19 & E20terminals of Relay



Display shows relay tripped on DIR (A-N fault)

Time Test: Directional Comparison



Zone Time Test (Distance Zone Backup)

Use “ZTime” Module




Green/Red Points areActual Points have been tested


Line Angle

Relay operated in 250 to 260ms

Carrier signal NOT received from other end on E19 & E20 terminals of Relay



Display shows relay tripped on Z (T) (BC fault)

Time Test: Distance Backup Zone



Characteristic Test

Use “ZChar” Module



Right click on “Mouse” & Press on “Append”& Create new Test Module



Select “Z-Char” Module from list



Double click on “Characteristic Test”



Press on “OK” & Create New Test Definition



Select characteristic from list



Select Test Method



Enter Test current (i.e. 2.3A)



Select Trigger (i.e. Open to Close)



Enter Angle Boundary for test (Say; start from 0 to 180 Degree)



Green Points (white lines) areActual Points have been tested


Line Angle




SOTF Test

Use “SSIMUL” Module



Select SSIMUL Module from list



State1 set for SOTF



Operating time recorded 47ms



Scheme Testing



Comm Channel

Protectionunder test

GPS Synch: End to End Testing

Test PUTT/POTT Schemes

1pps Signal 1pps SignalF6910+F6885+F6895 Option




Counter for Carrier send signals

Counter for Carrier receive signals

Both end relays tripped on 13ms



F6TEST2.21-1157 Advance Line Version



DOBLE ENGINEERING COMPANY2nd Floor Suvidhi Pride,Opp. Shell Petrol Pump,Gorwa-Refinery RoadVADODARA-390 015INDIA. Cell:- +91 98980 55956EMAIL ID:- [email protected]:- www.doble.com

38.lfdc relay testing with f6150-1

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