Hitachi Relion 670 Series Commissioning Manual page 135

1MRK506371-UUS Rev. M
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 TripAngle and tBreaker
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 41:
• the point RE (RE = Receiving End)
• the intersection between the line segment SE-RE and the X-line, which is defined through the
setting ReachZ1
• the point SE (SE = Sending End)
IEC10000141 V2 EN-US
Figure 41:
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 must be considered in order to avoid any hardware
damage. The test current is lower than the continuous permissive overload current I
current channels of the transformer module.
If the rated secondary current I
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
Line distance protection REL670
Commissioning manual
Trajectory of the impedance Z(R, X) for the injected current with two components: a
50 Hz component and a 49.5 Hz current component
of the analog channel is 1 A, then the maximum current test I
rs
4 I 4 A
= × =
rs
I
9000
rp
I 4 36000
= × = × =
ovrl
I 1
rs
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I = I(50 Hz) + I(49.5 Hz)
A
Section 11
Testing functionality by secondary injection
GUID-708C4033-3111-481F-9868-FF207C18C9F9 v2
of the protection
ovrl
is
ts
(Equation 1)
(Equation 2)
129