Circuit Breaker Status - Hitachi Relion 650 Series Technical Manual

Section 12
Monitoring
Gap voltage
IEC20000102 V2 EN-US
Figure 126: Pre-arcing time and scatter correction during gap voltage peak energizing
The value of PPREARCLX (in milliseconds) is calculated as.
IECEQUATION20100 V2 EN-US
Closing at gap voltage angles other than zero and peak
Current making targets other than gap voltage zero or peak are naturally located on an increasing or
decreasing slope of the sine wave. So, this target cannot be optimized considering the breaker
scatter characteristics. Nevertheless, to ensure minimum deviation from the specified target, it is
beneficial to keep the energizing angle within the limits of voltage zero target and voltage peak target
computed for the specific circuit breaker. The lowest achievable energizing angle is obtained by
assuming gap voltage zero closing application
energizing angle is obtained by assuming gap voltage peak closing application
If the target angle is within the highest and lowest achievable energizing angle, the scatter correction
is not applied. In this case, as there is no shift from the intended switching angle, SCATTERLX is
assigned a value of zero and PPREARCLX denotes the pre-arcing time at the intended switching
target (TGTANGLX).
For a capacitive load type (capacitor, line, cable), if the target angle is beyond the highest and the
lowest achievable energizing angle the lowest achievable energizing angle (optimized target for
voltage zero closing) is used as the optimized energizing angle.
For an inductive load type (reactor, transformer), if the target angle is beyond the highest and the
lowest achievable energizing angle the highest achievable energizing angle (optimized target for
voltage peak closing) is used as the target energizing angle.
In this case, the shift of the optimized energizing angle from the intended switching target
(TGTANGLX) is given at the SCATTERLX output. Also, the pre-arcing time in the shifted optimized
energizing target is given at the PPREARCLX output.
12.18.7.5

Circuit breaker status

In protection and control systems, the mechanical status (closed or open) of a circuit breaker is
typically obtained from its 52a (NO) and 52b (NC) auxiliary contacts.
condition of NO and NC during different breaker states.
282
0
RDDS

1
T
6
2

T
1
© 2021 Hitachi Energy. All rights reserved.
0 = Gap voltage peak
1 = Electrical target making instant
2 = Mechanical target closing instant
 
T
PPREARCLX=
2
1
 
T
SCATTERLX = 1
6
(Section 12.18.7.4.1) and the highest achievable
1MRK 511 557-UEN Rev. A
1 = Pre-arcing time
0 = Scatter correction
GUID-79394AA2-396E-48D5-9053-CB767922A5D2 v2
(Section 12.18.7.4.2).
GUID-3C8446C0-0296-476C-B3ED-D3424D5E5188 v2
Table 269 provides the typical
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