ABB RET670 - Setting Parameters

System studies should determine the settings for the hold timer tH. The purpose of this
timer is, to secure continuous output signal from Power swing detection function
(ZMRPSB, 68) during the power swing, even after the transient impedance leaves
ZMRPSB (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 ZMRPSB(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 ZMRPSB (68) function,
if the measured impedance remains within ZMRPSB (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.
3.6.11.3 Setting parameters
Table 78: ZMRPSB (68) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disbled/Enabled operation
X1InFw 0.10 - 3000.00 ohm 0.01 30.00 Inner reactive boundary, forward
R1LIn 0.10 - 1000.00 ohm 0.01 30.00 Line resistance for inner characteristic angle
R1FInFw 0.10 - 1000.00 ohm 0.01 30.00 Fault resistance coverage to inner resistive
line, forward
X1InRv 0.10 - 3000.00 ohm 0.01 30.00 Inner reactive boundary, reverse
R1FInRv 0.10 - 1000.00 ohm 0.01 30.00 Fault resistance line to inner resistive
boundary, reverse
OperationLdCh Disabled
Enabled
- - Enabled Operation of load discrimination characteristic
RLdOutFw 0.10 - 3000.00 ohm 0.01 30.00 Outer resistive load boundary, forward
LdAngle 5 - 70 Deg 1 25 Load angle determining load impedance area
RLdOutRv 0.10 - 3000.00 ohm 0.01 30.00 Outer resistive load boundary, reverse
kLdRFw 0.50 - 0.90 Mult 0.01 0.75 Multiplication factor for inner resistive load
boundary, forward
kLdRRv 0.50 - 0.90 Mult 0.01 0.75 Multiplication factor for inner resistive load
boundary, reverse
Table continues on next page
1MRK504116-UUS C Section 3
IED application
365
Application manual