Setting The Reach With Respect To Load - ABB RELION 670 SERIES REG670 Applications Manual

Section 8
Impedance protection
8.2.3.6
220
( )
×
X m 0 Im
( )
=
Im K 0
( )
2
+
Re B Im
EQUATION1428 V2 EN-US
Parallel line is out of service and grounded in both ends
Apply the same measures as in the case with a single set of setting parameters. This
means that an underreaching zone must not overreach the end of a protected circuit for
the single phase-to-ground faults.
Set the values of the corresponding zone (zero-sequence resistance and reactance)
equal to:
2
æ
X
m0
×
R = R ç 1 + ------------------------- -
0E 0
2
è
R + X
0 0
EQUATION561 V1 EN-US
2
æ X
m0
×
X = X ç 1 – ------------------------- -
0E 0
2 2
è
R X
+
0 0
EQUATION562 V1 EN-US

Setting the reach with respect to load

Set separately the expected fault resistance for phase-to-phase faults RFPPZx and for
the phase-to-ground faults RFPGZx for each zone. For each distance zone, set all
remaining reach setting parameters independently of each other.
The final reach in the resistive direction for phase-to-ground fault loop measurement
automatically follows the values of the line-positive and zero-sequence resistance, and
at the end of the protected zone is equal to equation 65.
1
( )
= × + +
R 2 R1 R0
3
ANSIEQUATION2303 V1 EN-US
  
2 X1Zx X0Zx


loop arctan


 
2 R1Zx R0Zx
EQUATION2304 V2 EN-US
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
B
( )
2
B
ö
÷
2
ø
ö
÷
ø
RFPG



1MRK 502 071-UUS A
(Equation 62)
GUID-345B36A6-B5FB-46DD-B5AE-81A1599FFC6E v1
(Equation 63)
(Equation 64)
GUID-ED84BDE6-16CD-45ED-A45D-5CFB828A9040 v6
(Equation 65)
(Equation 66)
Application manual