43.sel300g relay testing with f6150

Knowledge Is PowerSM

Apparatus Maintenance and Power Management for Energy Delivery

Brief Introduction for Automated Relay Testing

Kamin DaveManager – Marketing & Protection Applications

DOBLE ENGINEERING COMPANY, INDIA

[email protected]



Protection Relay Testing:

Testing of Generator Protection Relay type SEL300G



Relay Details: SEL300G

Under & Over Voltage Protection (27/59)Negative sequence Protection (46)Reverse & Low Forward Power Protection (32)Over Excitation Protection (24)Over & Under Freq. Protection (81O/81U)Under Impedance Protection (21)Loss of Excitation Protection (40G)100% Stator E/F Protection (27TN/64G2)




Out of Step Protection (78)Voltage Restrained O/C Protection (51VR)Voltage Controlled O/C Protection (51VC)Rotor E/F Protection (64R)Breaker Failure ProtectionGenerator Differential Protection (87D)Ground differential Protection (87N)95% Stator E/F Protection (59GN/64G1)




Primary & Backup Protection




Rotor Earth Fault Protection




Characteristic plotted in F6TEST2.21 software for testing

Load Encroachment characteristic plotted

Zone2 Reach

Zone1 Reach




Select “D” from List




GCB Status Close Input




Breaker close input & VT fuse fail input




VT fuse fail Status Input

Characteristic selection




V/Hz Curve1




V/Hz Curve2




V/Hz Curve3




Selection of Curve




Set as a Low Forward Power threshold range

Set as a Reverse Power threshold range




Set as Reverse Power function

VT Fuse fail Input



Relay Details: SEL300GRelay Logic for Reverse Power Function




VT fuse fail Status Input

Offset reactance for Zone1

Zone1

Zone2

Offset reactance for Zone2

Directional Angle for Zone2




Directional Angle for Zone2




Relay Logic for Loss of Excitation Function




Enter Setting of NPS Threshold

Enter Time Dial Setting



Relay Details: SEL300GRelay Logic for Negative Sequence current Function




Select function “V”




Threshold value

Curve selection “C1”

VT fuse fail status input




K = 0.25Normal Inverse Curve




Select function “C”




Threshold value

Curve selection “C1”

VT fuse fail status input




K = 0.2Normal Inverse Curve




0-95% SEF

100% SEF




Under Freq. function

Under Freq. function



Test Equipment

• Make : DOBLE

• Model : F6150

Software

• F6TesT Version 2.21-1165



F6150 Connections:

CT ConnectionsPT Connections



SEL300 Connections:PT ConnectionsCT Connections

Connections of 4th Voltage for 100% SEF



Testing of Over Excitation Function (24)



VA

VB

VC

I1

I2

I3

SEL

Test Circuit: Over Excitation Function Test

Source Configurations:3V X 3I

CT Inputs



• Inverse Time Curve Test

Tests conducted:



Use “VFChar” Module for Characteristic Search Test



Curve3 selection

Enter Time Dial



Curve3 for Testing



Expected Curve

Actual Curve from relay

Phasor

Select “ABC” Fault for testing

Relay settings:V/Hz = 1PUCurve = 3Time Dial = 1



Testing of Reverse Power Function (32)



Reverse Power Protection (32R): Example1

G D Y

GT

GCB

Gen Set

G D Y

GT

GCB

Gen Set

CB1

CB2

CB3

CB4

CB

5

TL Line

TL Line

MW

MW

Healthy Prime-mover

Failed Prime-mover

MVAR

MVAR

E

E




G D Y

GT

GCB

Gen Set

G D Y

GT

GCB

Gen Set

CB1

CB2

CB3

CB4

CB

5

TL Line

TL Line

MW

MW

Healthy Prime-mover

Failed Prime-mover

MVAR

MVAR

E

E




G D Y

GT

GCB

Gen Set

CB1 CB3

CB

5

TL LineMW

Failed Prime-mover

MVAR

E

Active Power Import from Grid sources

Grid

GridMW

MW

MW




GD YTR1

GCB

Gen Set

Failed Prime-mover

MVAR

E

Only Reactive Power Export to Loads

CB1 CB2

D YTR2

CB3 CB4

MC

B5CB6

Load

sLo

ads



VA

VB

VC

I1

I2

I3

SEL

Test Circuit: Reverse Power Function Test

Source Configurations:3V X 3I

CT Inputs



• Pickup Test

• Time Test

Tests conducted:



Use “RAMP” Module for Pickup Test



Pickup Test @ Unity PF:

MW- MW

- MVAR

MVAR

Watts = VA = 952.87W

- MVAR

MVAR

MW- MW

IExpected = 1A



Pickup Test @ Unity PF:Vn = 110VIn = 5APF = 1 (Unity)PN = (1.7325*0.11*1000*5) = 952.87watts%PSet = 20% of PN

PSet = (952.87 * 20)/(PF*100) = 190.5wattsIExpected = (190.5)/(1.7325*0.11*1000*PF) = 1A



Enter Expected Value = 1A Enter “Action”details

Pickup

Actual Operating Values

IA@180o



Pickup Test @ 0.8 lag PF:

MW- MW

- MVAR

MVAR

Watts = 762.3W

- MVAR

MVAR

MW- MW

IExpected = 1.15A

VA = 952.87VA



Enter Expected Value = 1.15A Enter “Action”details

Pickup


IA@150o



Pickup Test @ 0.8 lead PF:

MW- MW

- MVAR

MVAR

Watts = 762.3W

- MVAR

MVAR

MW- MW

IExpected = 1.15AVA = 952.87VA



Enter Expected Value = 1.15A Enter “Action”details

Pickup


IA@210o



Use “SSIMUL” Module for Time Test



TExp = 200ms

TAct = 262ms



Testing of Loss of Excitation Function (40G)



VA

VB

VC

IA

IB

IC

SEL

Test Circuit: Field Failure Function Test

Source Configurations:3V & 3I

3V

3I



• Characteristic Search Test

• Characteristic Time Test

• RCA (MTA) Test

Tests conducted:



Use “ZChar” Module for Characteristic Search Test



Zone1 setting = 20.4Ohms




Show Phasors: fault voltage & current of “ABC” fault

Blue color shows expected characteristic and pink color shows actual tested characteristic



Click on Oscillograph: Shows, voltage & current waveform of “ABC” fault




Zone2 setting = 30.5OhmsOffset = -3.5 Ohms



Use “ZTime” Module for Characteristic Time Test




Results Table shows; Zone1 time is 0.1s & Zone2 time is 0.4s



SEL300G: Field Failure Function Testing




LED Indicator operated



Use “ZMTA” Module for Characteristic MTA (RCA) Test



Fault type “ABC” selected for testing

Angle Boundary (Theta1)

Angle Boundary (Theta2)



Testing of Negative Sequence Function (46)



Negative Sequence Protection (46)

Ia

Ic

Ib

Ia

Ic

Ib

IaIc

Ib

+VE Seq. -VE Seq. Zero Seq.

Sequence Components



G D Y

GT

GCB

Gen Set

MWMVAR

E

3

46

Operate: I2Measure>I2Set

Sys

MVARMW

F1




G D Y

GT

GCB

Gen Set3

46

Operate: I2Measure>I2Set

F1


33

IR @ 0o

IY @ 120O

IB @ 240O



I1@0o

I2@120o

I3@240o

SEL

Test Circuit: Negative Phase Seq. Function Testing

Source Configurations:3I

3I




Tests conducted:



Use “IChar” Module for Characteristic Search Test



Curve selection

Enter Time Dial



Inverse Curve for Testing



Blue color line shows “Expected curve” & Pink color line shows “Actual tested curve”

Phasors shows symmetrical componentsvalue (i.e. I1, I0 & I2)



Testing of Voltage Controlled Over Current Function (51VC)



Voltage Controlled over current function (51VC):

Normally Protection applied for Directly connected Generators where system voltage collapse drastically falls below set value (VSet) during faults.

Voltage Dependent Over Current Protection (51V)

G GCB

D Y

3

51VC Y Y

CB1 3

51

D YCB2 3

51

CB2 3Motpro

MVT

F1

F26.37 MVA11KVPF = 0.8, Xd”=36.4%, Xd’=26%Xd = 231%

1.5MVA, 11KV/0.415KV, %Z = 4.9%

1.5MVA, 11KV/0.415KV, %Z = 4.9%



V/Vs

I*/ [I>]

0.2 0.8

0.2

1.0

51V-Voltage Controlled

Vmeasured < VsetIpickup = (k*Iset)T = (0.14*T) / ((Ipickup)0.02-1)

Vmeasured > VsetIpickup = (Iset)T = (0.14*T) / ((Ipickup)0.02-1)




VA

VB

VC

IA

IB

IC

SEL

Test Circuit: Voltage Controlled O/C Function Testing


3V

3I




Tests conducted:



Curve selection

Enter Time Dial

Relay Settings:I> = 0.5*InCurve = C1Time Dial = 1V1 = 50VL-NV2 = 25VL-N



Characteristic created for testing

Relay Settings:I> = 0.5*InCurve = C1Time Dial = 1V1 = 50VL-NV2 = 25VL-N



Injected Voltage to relay



Display Phasors


Right click on check box to enable voltage O/P



Testing of Voltage Restrained Over Current Function (51VR)



Voltage Restrained over current function (51VR):

Normally Protection is applicable when Generator is connected to system through GT.


G GCB3

51VC Y Y

VT

D Y

D YCB1 3

51

D YCB2 3

51

CB2 3

Motpro

M

F1

F2



VA

VB

VC

IA

IB

IC

SEL

Test Circuit: Voltage Restrained O/C Function Testing


3V

3I



V/Vs

I*/ [I>]

0.2 0.8

0.2

1.0

51V-Voltage restrained Vmeasured > Vset2Ipickup = (Iset)

Vmeasured < Vset1Ipickup = (k*Iset)

Vset1 < Vmeasured < Vset2

Slope region





Tests conducted:



Curve selection

Enter Time Dial

Relay Settings:I> = 1*InCurve = C1Time Dial = 1V1 = 50VL-NV2 = 25VL-N



Characteristic created for testing

Relay Settings:I> = 1*InCurve = C1Time Dial = 1V1 = 50VL-NV2 = 25VL-N



Injected Voltage to relay



Display Phasors


Right click on check box to enable voltage O/P



Testing of 0-95% Stator Earth Fault Function (64R1/59GN)



Stator Ground Fault Protection (59GN): Resistor Ground

Maximum Ground Fault Amps = (Line to Neutral Voltage)-------------------------------------

(NGR Resistance)

VLN = 21000/1.7325

100 Ohms, 10s

IFIF PTR = 21000/240V

CTR = 20/1A



Stator Ground Fault Protection (59GN): Impedance Ground (NGT)

VLN = 21000/1.7325KVPri = 21kVKVSec = 0.240kVKVA = 70KVA R = 0.913 Ohms Full Load current in Primary wdg = 3.33A Ground Fault Impedance = 3640.004 Ohms

IF



VA

VB

VC

VN

SEL

Test Circuit: 0-95% SEF Function Testing

Source Configurations:4V

3V

4th V@50Hz



• Pickup Test

• Time Test

Tests conducted:



4th Voltage used

Expected value = 5VActual value = 5.3V

Pickup Value = 5V

Action details for Voltage Ramp



Ground Fault condition

Display Phasor



Ground Fault condition

Display Waveforms (Analogue & Digital Channels)

4th Voltage



Actual trip time = 1s

Relay Output (Open to Close contact)



Testing of 100% Stator Earth Fault Function (64R2/27TN)



Stator Ground Fault Protection (27TN)

3rd HarmonicCurrent circulate



Stator Ground Fault Protection (27TN): 3RD

Harmonic Under Voltage Method3rd Harmonic Under voltage relay

3rd Harmonic Voltage at Neutral End reduced

3rd Harmonic Voltage at Neutral End reduced

IF

3rd harmonic voltage dropBecause capacitanceIs shorted

IF



VA

VB

VC

VN

SEL

Test Circuit: 100% SEF Function Test

Source Configurations:4V

3V

4th V@150Hz



• Pickup Test

• Time Test

Tests conducted:



4th Voltage used @ 150Hz Freq.

Expected value = 1VActual value = 1.2V

Pickup Value = 1.2V

Action details for Voltage Ramp



Ground Fault condition close to Neutral



Actual trip time = 0.55s




SEL300G: 100%SEF Function Testing




Testing of Under Frequency Function (81UF)



VA

VB

VC

IA

IB

IC

SEL

Test Circuit: Under Freq. Function Test


3V

3I



• Pickup Test

• Time Test

Tests conducted:



Freq. of Voltage sources

Expected value = 48.5HzActual value = 48.498Hz

Pickup Value = 48.5Hz

Action details for Freq. Ramp



Under Frequency condition (48Hz Freq. for Voltage sources)



Actual trip time = 0.33s




Testing of Over Frequency Function (81O/F)



VA

VB

VC

IA

IB

IC

SEL

Test Circuit: Over Freq. Function Test


3V

3I



• Pickup Test

• Time Test

Tests conducted:



Freq. of Voltage sources

Expected value = 51HzActual value = 51.0002Hz

Pickup Value = 51.0002Hz

Action details for Freq. Ramp



Over Frequency condition (51Hz Freq. of Voltage sources)



Actual trip time = 93.9ms




SEL300G: 100%SEF Function Testing




Training to L&T Power at Doble Training Center



DOBLE ENGINEERING COMPANY2nd Floor Suvidhi Pride, Gorwa-Refinery RoadOpposite Shell Petrol PumpVADODARAINDIA. Cell:- +91 98980 55956EMAIL ID:- [email protected]:- www.doble.com

43.sel300g relay testing with f6150

Documents

tl linecb1

15aenter action

tl linecb2

neutral end

negative sequence

characteristic

fault voltage

mover gen