ABB REL650 - Design

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