ABB RELION 650 SERIES, Technical Manual

Page: 153 / 942

6.4.7.5 Design
GUID-1615F014-3529-45D0-813B-153754DED1C7 v3
At every execution of the function the following is calculated: active power
P
,
reactive power
Q
, rotor angle
ROTORANG
, quantity
UCOSPHI
, the positive-
sequence current
CURRENT
and voltage
VOLTAGE
. All other quantities, that can as
well be read as outputs, are only calculated if the Z(R, X) enters the limit of reach
zone, which is a circle in the complex (R – X) plane. When the complex impedance
Z(R, X) enters the limit-of-reach region, the algorithm:
• determines in which direction the impedance Z moves, that is, the direction the
lens is traversed
• measures the time taken to traverse the lens from one side to the other one
If the traverse time is more than the limit 40 or 50 ms, a pole-slip is declared. If the
complex impedance Z(R, X) exits the lens on the same side it entered, then it is a
stable case and the protected machine is still in synchronism. If a pole-slip has been
detected, then it is determined in which zone the centre of oscillation is located. If
the number of actual pole-slips exceeds the maximum number of allowed pole-
slips in either of the zones, a trip command is issued taking care of the circuit
breaker safety.
IEC10000116-3-en.vsd
GENMODE
Calculation of
R and X parts
of the complex
positive-
sequence
impedance
Z(R, X)
UPSRE
UPSIM
UPSMAG
R
IPSRE
IPSIM
Z(R,X)
Z(R,X)
within limit of
reach?
X
NO
Return
YES
Z(R,X)
within lens
characteristic?
NO
YES
Z(R,X)
entered lens
from?
Function alert
RIGHT
LEFT
Z(R,X)
exited lens
on the left- hand
side?
NO
YES
YES (pole- slip!)
Was
traverse time
more than
50 ms?
Motor losing
step ?
Generator losing
step ?
NO
X
R
Calculation of
positive- sequence
active power P,
reactive power Q,
rotor angle
ROTORANG
and
UCOSPHI
P
Q
ROTORANG
>= 1
Number
of pole- slips
exceeded in
a zone?
ZONE 1
ZONE 2
Open
circuit
breaker
safely
TRIP
TRIPZ1
TRIPZ2
UCOSPHI
UCOSPHI
ROTORANG
SLIPFREQ
GENMODE
MOTMODE
NO
Calculation of
R and X parts
of the complex
positive-
sequence
impedance
Z(R, X)
UPSRE
UPSIM
UPSMAG
R
IPSRE
IPSIM
Z(R,X)
Z(R,X)
within limit of
reach?
X
NO
Return
YES
Z(R,X)
within lens
characteristic?
NO
YES
Z(R,X)
entered lens
from?
Function alert
RIGHT
LEFT
Z(R,X)
exited lens
on the left- hand
side?
NO
YES
YES (pole- slip!)
Was
traverse time
more than
50 ms?
Motor losing
step ?
Generator losing
step ?
NO
X
R
Calculation of
positive- sequence
active power P,
reactive power Q,
rotor angle
ROTORANG
and
UCOSPHI
P
Q
ROTORANG
>= 1
Number
of pole- slips
exceeded in
a zone?
ZONE 1
ZONE 2
Open
circuit
breaker
safely
TRIP
TRIPZ1
TRIPZ2
UCOSPHI
UCOSPHI
ROTORANG
SLIPFREQ
MOTMODE
NO
IEC10000116 V3 EN-US
Figure 68: OOSPPAM Simplified function block
1MRK 506 382-UEN A
Section 6
Impedance protection
Line distance protection REL650 2.2 IEC 147
Technical manual