33.duobias-m relay testing

Knowledge Is PowerSM

Apparatus Maintenance and Power Management for Energy Delivery

Brief Introduction for Automated Relay Testing(Relay type DUOBIAS-M)

Kamin DaveManager – Sales & Applications

South Asia & Middle East

DOBLE ENGINEERING COMPANY



Protection Relay Testing:

Testing of Differential Protection Relay type DUOBIAS-M



Relay Details: DUOBIAS-M

Two/Three Winding Differential Protection relaysInbuilt IDMTL & Inst. O/C function for backup ProtectionLow Impedance Restricted Earth Fault ProtectionAutomatic calculation for TAP values based on CTRSettings for Transformer & CT vector group compensations 2nd Harmonic content setting during inrush period due to point on wave switching

DFT (Independent or Cross Blocking)



Relay Details: DUOBIAS-MMAKE : REYROLLEMODEL : DUOBIAS-MRelay Settings:Differential Element:

MVA = 20VWDG1 = 110KVVWDG2 = 11KVTRCON = DYn11.CTCON = YYID> = 0.2Bias Slope Limit = 4.0PUID>> = 8.0PUm1 = 20% (0.2pu)(2f0) / I(f0) = 20.0%



Relay Details: DUOBIAS-MMAKE : REYROLLEMODEL : DUOBIAS-MLocation : 220KV Kavoor SS, KPTCLRelay Settings:Differential Element:

CTR1 = 200CTR2 = 1200W1 = 1.9057W2 = 1.14345In = 1AStar winding is earthed



Relay Details: DUOBIAS-MFLC on TR Primary side:

IFLC = (20*1000) / (1.7325*110)= 104.94 Ampere

FLC on TR Secondary side:IFLC = (20*1000) / (1.7325*11)

= 1049.45 AmpereCF1 = (1*104.94) / (200*1) = 0.699W1 = (1 / CF1) = (1/0.699) = 1.9057CF2 = (1*1049.45) / (1200*1) = 0.874W2 = (1/CF2) = (1/0.874) = 1.14345



Relay Setting: REYDISP

Diff Settings



Relay Setting: REYDISP

CT Ratio for WDG1 & WDG2



Relay Characteristic: Dual Slope



Relay Characteristic on Settings:

m1=20%m2



Test Equipment

• Make : DOBLE

• Model : F6150

Software

• F6TesT Version 2.19-1064



IA

IB

IC

I1

I2

I3

DUOBIAS

Test Circuit:

Source Configurations:Six current sources

Winding 1 currents

Winding 2 currents



• Pickup test for Winding1

• Pickup test for winding2

• Slope Characteristic test

• 2nd Harmonic test

Tests conducted:



Winding1 Pickup Test

Use “RAMP” Module



Winding Pickup Test:Pickup Test for Winding1 (WDG1):-Ipickup = (ID)*CF1

= (0.2)*0.524= 0.11A

Pickup Test for Winding2 (WDG2):-Ipickup = (ID)*CF2

= (0.2)*0.944 = 0.17A



How to Create Test Plan in Software???



Right click on Mouse & Click on “Append”to Create new location in location level



Right click on Mouse & Click on “Append”to Create new relay in Relay level



Right click on Mouse & Click on “Append”to add New Testplan in Testplan level



Click on “Test Type”& select “Ramp” module



Double click on“Test name” & createNew test definition



Click on Pulldown arrow &Select “6 Currents (Right bank)”



Click on “Yes”



Now, it is showing6 Current sources for test



Pickup Test: WDG1

Expected value = 0.1A Actual Test value = 0.11A

WDG1 current sources

Select Trigger “Open to Close”

Pickup value



Pickup Test: WDG1

Save & Close module”



Winding2 Pickup Test

Use “RAMP” Module



Right click on Mouse & Click on “Append”to add New Testplan in Testplan level



Click on “Test Type”& select “Ramp” module



Double click on“Test name” & createNew test definition



Click on Pulldown arrow &Select “6 Currents (Right bank)”



Click on “Yes”



Now, it is showing6 Current sources for test



Pickup Test: WDG2

Expected value = 0.17A Actual Test value = 0.18A

WDG2 current sources


Pickup value



Slope Characteristic Test

Use “DiffChar” Module



Slope Characteristic Test:



Slope Characteristic Test:Vector Compensation




YDY0 YD1

Relay

0o

0o

+30o

0o

YD11 Vector Compensation



How to create testplan???



Click on “Add” button

Select “Differential” Function, enter “Function name”And Click on “Next” button



Select “Bias Formula” from list

Bias current Formula:Ibias = (IP+IS) / 2



Enter YDY0 & YD1 R

Amplitude Compensation

DYn11

YDY0 YD1



Click on “Modify” button



Enter Slope SLP1 = 20% & SLP2 based on relay setting

SLP1=20%

SLP2

How to AdjustSlope?

Enter Pickup value



Select Bias current (Ibias) formula from list

Bias current Formula:Ibias = (IP+IS) / 2

Click on “Close” buttonAfter setting Slope curve



Click on “Append” button to Create new test module



Select “DiffChar” module



Select relay settings from list



Select Test elements



Enter Max test current 15A



Select test points for test & click on Add Point to List



Blue line showsExpected curve

White line showsActual results on Selected points

Test results



Export report in PDF, MS Word, Text format



Second Harmonics Test

Use “DATC 6.38” Module



%2nd Harmonics aremore during TREnergization



IA

IB

IC

I1

I2

I3

DUOBIAS

2nd Harmonic Test : Test Method

50Hz +100HzCombine signal



How to Set Harmonics in“DATC 6.38” Module??



Click on Harmonic

Select 2nd Harmonic

Enter 2nd HarmonicContent 18% inAll three phases



Click on Time Configuration



Select contact status“O C”



Enter trip time value



Click on Oscillogram



18% 2nd Harmonics in all three phases

Click on “Start Transient” button



Harmonic Analysis barShows % of 2nd Harmonicis 18%

Harmonic Analysis barShows FundamentalCurrent is 100%



2nd Harmonic Test : Trip/Block

Relay issued Trip commandBecause injected valueOf 2nd harmonicContent is less thanSet value



Click on Harmonic

Select 2nd Harmonic

Enter 2nd HarmonicContent 22% inAll three phases



Click on Oscillogram




22% 2nd Harmonics in all three phases

Start Transient




Relay Issued Trip command when 2nd Harmonic components(18%) Less than set value (20%)

Relay blocked trip command when 2nd Harmonic components(22%) more than set value (20%)



DOBLE ENGINEERING COMPANY305-SAKAR, O.P. ROADNR. ABS TOWERVADODARA-390 015INDIA. Tel:- +91 265 655 77 15EMAIL ID:- [email protected]:- www.doble.com

33.duobias-m relay testing

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