Out-Of-Step Protection Oosppam (78); Identification; Application - Hitachi Relion 670 Series Applications Manual

1MRK511407-UUS Rev. N
then it is necessary to set the load angle in FDPSPDIS (21) or FRPSPDIS (21) function to not less than
equation 34.
LdAngle
EQUATION1738-ANSI V1 EN-US
It is recommended to set the corresponding resistive reach parameters in reverse direction (RLdOutRv
and kLdRRv) to the same values as in forward direction, unless the system operating conditions, which
dictate motoring and generating types of oscillations, require different values. This decision must be
made on basis of possible system contingency studies especially in cases when the direction of
transmitted power may change fast in short periods of time. It is recommended to use different setting
groups for operating conditions, which are changing only between different periods of year (summer,
winter).
System studies should determine the settings for the hold timer tH. The purpose of this timer is to secure
continuous output signal from the Power swing detection function (ZMBURPSB, 68) during the power
swing, even after the transient impedance leaves ZMBURPSB (68) operating characteristic and is
expected to return within a certain time due to continuous swinging. Consider the minimum possible
speed of power swinging in a particular system.
The tR1 inhibit timer delays the influence of the detected residual current on the inhibit criteria for
ZMBURPSB(68). It prevents operation of the function for short transients in the residual current
measured by the IED.
The tR2 inhibit timer disables the output PICKUP signal from ZMBURPSB (68) function, if the measured
impedance remains within ZMBURPSB (68) operating area for a time longer than the set tR2 value. This
time delay was usually set to approximately two seconds in older power-swing devices.
The setting of the tGF timer must cover, with sufficient margin, the opening time of a circuit breaker and
the dead-time of a single-phase autoreclosing together with the breaker closing time.
7.2

Out-of-step protection OOSPPAM (78)

7.2.1

Identification

Function description
Out-of-step protection
7.2.2

Application

Under balanced and stable conditions, a generator operates with a constant rotor (power) angle,
delivering an active electrical power to the power system, which is equal to the mechanical input power
on the generator axis, minus the small losses in the generator. In the case of a three-phase fault
electrically close to the generator, no active power can be delivered. Almost all mechanical power from
Phasor measurement unit RES670
Application manual
é
tan(LdAngle
³
arctan
ê
PHS ë
kLdRFw
© 2017 - 2023 Hitachi Energy. All rights reserved
ù é
) tan(25 )
=
PSD arctan
ú ê
û ë
0.61
IEC 61850 IEC 60617
identification identification
OOSPPAM
<
°
ù
= °
37.5
ú
û
GUID-8321AC72-187C-4E43-A0FC-AAC7829397C3 v1
GUID-BF2F1533-BA39-48F0-A55C-0B13A393F780 v2
ANSI/IEEE C37.2
device number
78
GUID-11643CF1-4EF5-47F0-B0D4-6715ACEEC8EC v6
Section 7
Impedance protection
(Equation 34)
103