Verifying The Settings - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UEN E
11.4.12.1

Verifying the settings

The test of the out-of-step protection function is made to verify that the trip is issued if the
following events happen.
• the impedance, seen by the function, enters the lens characteristic from one side and
leaves it from the opposite side
• the trip is issued according to the settings
The tripping zone needs to be detected and confirmed. The test may be performed by taking
into account the following key points that are shown in Figure 43:
• the point RE (RE = Receiving End)
• the intersection between the line segment SE-RE and the X-line, which is defined through
the setting
• the point SE (SE = Sending End)
IEC10000141 V2 EN-US
Figure 43: Trajectory of the impedance Z(R, X) for the injected current with two
The test of the out-of-step protection function requires the injection of the analog quantities
for a quite long time. The rating of the analogue channels is considered in order to avoid any
hardware damage. The test current is lower than the continuous permissive overload current
I of the protection current channels of the transformer module.
ovrl
If the rated secondary current I
is
I I
≤
ts ovrl
EQUATION14041 V1 EN-US
If the CT of the generator has ratio 9000/1 A, then in primary values
I I
≤
t ovrl p ,
EQUATION14042 V1 EN-US
Reference is made to the numerical values of the example, explained in the "Setting guidelines"
Application Manual . A test current equal to 2.5 time the base current of the generator is
of the
chosen; this choice is related to the selected test voltage that is applied while testing the point
SE and RE.
Transformer protection RET670
Commissioning manual
ReachZ1
components: a 50 Hz component and a 49.5 Hz current component
rs
I A
4 4
= × =
rs
I
9000
rp
I 4 36000
= × = × =
ovrl
I 1
rs
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TripAngle and tBreaker
I = I(50 Hz) + I(49.5 Hz)
of the analog channel is 1 A, then the maximum current test I
A
Testing functionality by secondary injection
GUID-708C4033-3111-481F-9868-FF207C18C9F9 v1
(Equation 5)
(Equation 6)
Section 11
ts
141