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

kdave@doble.com

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

External fault (F1) in Forward direction

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

Reverse Direction

F1 Internal fault (F1) in Forward direction

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

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

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

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

S1RA RBF1

RC RDZC ZD

Relay “RC” will operate on Back Zone

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

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

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

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

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

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

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

Line Angle

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

Line Angle

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

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:- kdave@doble.comWebsite:- www.doble.com

38.lfdc relay testing with f6150-1

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