h5a verzosa residual compensation

7/29/2019 H5a Verzosa Residual Compensation

1/18

Working Group H5A "CommonFormat for Configuration data

Residual Compensation

J un Verzosa


2/18

Residual Compensation or

Zero-sequence Compensation?

Names of Factors in Use by various relays

KNmag and KNangle

K0mag and K0angle

RG/RL and XG/XL (or RE/RL and XE/XLor KR and KX)

Z0/Z1 mag and Z0/Z1 ang (or Z1ang, Z0ang)

No factor used in setting but calculated internallybased on Z1 and Z0 (or R1, X1, R0, X0)

Etc.


3/18


Zero-sequence Compensation?Formulas Used by some relays

KN or KG of KE or K0 or KZN= ZN /Z1 = (Z0 - Z1) / 3 Z1

= (Z0/Z1 1) / 3

K0 = Z0/Z1 -1K0 = Z0/Z1

=== 1

1

0

3

1

R

R

RL

RE

RL

RGkR

Kr and Kx are not applicable

to MHO characteristics

Different formulas are

attached to factor symbol K0.KN factor has only one

formula.

=== 11

0

3

1

X

X

XL

XE

XL

XGkX


4/18


Zero-sequence Compensation?EA Z1Zs

EB Z1Zs

EC Z1Zs

ZNZNs

RelayLocation

IA

IC =0

IN =residual current= 3I0

IB = 0

VaR

Ph ANFault

F

= (Z0 - Z1)/3

KN = ZN / Z1 = (Z0 Z1) / 3Z1

ZN = KN * Z1


5/18



Residual Compensation:

Zrelay = VaR /(Ia + KN*IN) = Z1

where: KN = ZN/Z1 = (Z0 Z1) / 3Z1

= (Z0/Z1 -1 ) / 3

Zero-sequence Compensation:Zrelay = VaR /(Ia + K0*I0) = Z1

where: K0 = Z0/Z1 -1


6/18



ZL = RL+jXL

ZE = RE+jXEZG = RG+jXG

=== 1

1

0

3

1

R

R

RL

RE

RL

RGkR

=== 1

1

0

3

1

X

X

XL

XE

XL

XGkX


7/18


Zero-sequence Compensation? IEC61850

Inconsistent use of names

Residual current (IN) is NOT Equal to

Zero-sequence current (I0) IN = 3 * I0


8/18


Zero-sequence Compensation? Suggestion 1:

Name = Residual compensation factorResidual compensation type (ResCompType):

KNfactor or

KrKxfactor (applies to polygon only) RFLoop (true/false) (applies to polygon only)

KNfactor consists of:

KNmag - residual impedance compensation factor magnitude

KNang - residual impedance compensation factor angle

KrKxfactor consists of:

KR - residual resistance compensation factor KX - residual reactance compensation factor


9/18



KNfactor consists of:

KNmag - residual impedance compensation factor magnitude

= magnitude of (Z0/Z1 1) / 3

KNang - residual impedance compensation factor angle

= argument of (Z0/Z1 1) / 3

KrKxfactor consists of:

KR - residual resistance compensation factor

= (R0/R1 -1) / 3 KX - residual reactance compensation factor

= (X0/X1 -1) / 3


10/18

Residual Compensation

Suggestion 2 Add RFmode (applies to polygon char. only) Mode1: RFLoop = RF

Mode2: RFLoop = RF*(1+Kr) Mode3: ZFLoop = ZF*(1+KN)

If RFmode is used then Residual Compensationneeds KNmag and KNang only (No Kr and Kx)since Kr and Kx can be calculated. However, theZone Characteristic Angle (ZCA) must be

known; this is usually one of the Zone settings.

Fault Loop Resistance Mode


11/18

How is the Fault

Resistive Reach Set?

Mode1: RFset = RFLoop

Mode2: RFset = RFLoop / (1 + Kr)Mode3: RFset = RFLoop / (1 +KN)?


12/18

How are the Zone Reaches Set?Z1

RFLoop

VaR

IaR

AN fault

21

ZN

Mode1: RFset = RFLoop

Zset = Z1, kN = ZN/Z1

Mode2: Zset = Z1

Kr = (R0/R1-1)/3, Kx=(X0/X1-1)/3RFset = RFLoop / (1 + Kr)

Mode3: Zset=Z1, KN = ZN/Z1

RFset ~ RFLoop / (1 + |KN|) approx. for small KNang

Zset

RFset

VaR

IaR

AN fault

21

KN or Kr, Kx

Notes:

Z1 is the usual reachsetting of 75% to 85%of ZLine.

RFoop includes some

added margin to takecare of remote infeedcurrent.


13/18

Calculating Kr and Kx

from KNmag and KNangZone Characteristic Angle (ZCA) is not

necessarily equal to the line angle; It is requiredfor RFmode2

Kr = KNmagCos(KNang+ZCA) / Cos(ZCA)

Kx = KNmagSin(KNang+ZCA) / Sin(ZCA)


14/18

Mode1: KN, RF = RFLoop

ZPh

ZL

oop

XPhLine

XLoopLine

RBli

nd

er

RBli

nd

erLoop

RBli

nd

erL

oop

RBli

nd

er

TiltAngle

TiltAngle

O

ZLoopAng ZLoopAng

ZLoopAng RFLoop

-RFLoop

P1

P2

DirLoopAng


15/18

Mode2: KrKxfactor,

RFLoop = RF * (1+Kr)

ZLoop

XPhLine

XLoopLine

RBli

nd

erLoop

RBli

nd

erLoop

ZphAngZphAng

TiltAngle

TiltAngleLoop

O

ZLoopAng ZLoopAngZLoopAng

RFph

-RFLoop

P1

P2

DirAngDirLoopAng1

RFLoop

- RFph

DirLoopAng2

RLoop = RPh (1 + Kr) XLoop = XPh (1 + Kx)


16/18

Mode3: KN,

ZFLoop = ZF * (1+KN)Z1L

P4L

P2L

P3L

P3

Z1P2

P4

Per Phase

Characteristic

Loop

Characteristic

O

P2

P5L

P4L

P3L

P2LP1L

P6

P5

P3

P4P1

P6LRFph

RLoop = ZLoop*Cos(ZLoopAng)

XLoop = ZLoop*Sin(ZLoopAng)

ZLoop = ZPh*(1+KN)


17/18

Mode3: KN,

ZFLoop = ZF * (1+KN)

ZPh

ZL

oop

XPhLine

XLoopLine

RBli

nd

erLoo

p

ZphAng

TiltAngle

TiltAngle

O

ZLoopAng ZLoopAngZLoopAng RFph

-RFLoop

P1

P2

RFLoop

Applies to characteristic angle and resistiveblinders only, not the reactance lines.


18/18

Comparison of

Mode1, Mode2 and Mode3

XPhLine

XLoopLine

TiltAngle

TiltAngle

O

ZLoopAng ZLoopAngZLoopAngRFLoop

-RFLoop

P1

P2

DirLoopAng

ZPh

ZL

oo

p

XLoopLine

RBli

nderLoop

RBli

nd

erLoop

ZphAngZphAng

TiltAngle

TiltAngleLoop

O

ZLoopAngZLoopAngRFph

-RFLoop

P1

P2

DirAngDirLoopAng1

RFLoop

- RFph

ZPh

ZL

oo

p

RBli

nderLoop

h5a verzosa residual compensation

Documents