Compensation Of Circuit Breaker Switching Times Cbcomp; Identification; Functionality - Hitachi Relion 650 Series Technical Manual
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Section 12
Monitoring
12.16
Compensation of circuit breaker switching times
CBCOMP
12.16.1
Identification
Function description
Compensation of circuit breaker switching times
12.16.2
Functionality
To achieve accurate controlled switching, a point-on-wave controller needs to take into account the
estimated operating times of the circuit breaker. Depending on the design, mechanical closing and
opening times may be affected by variations in external conditions such as:
•
Control voltage
•
Temperature
•
Drive energy
•
Idle time (which is the time elapsed since last circuit breaker operation)
Each quantity that is measured can be converted into a compensation value (that is, deviation in
milliseconds from the nominal operating time) – in PWC600 this is done by the ANSCAL function.
The compensation of circuit breaker switching times (CBCOMP) function provides combined
compensation by adding up all available individual compensation values for each CB pole. The
resulting total compensation values (one per pole) take into account the quantity and health status of
sensors and the CB operation type (closing or opening). In controlled switching, this is used to
optimize prediction of the circuit breaker operating times for precise switching instants. CBCOMP has
pre-defined inputs for the compensation values of the external parameters listed above. Furthermore,
it provides two groups of spare inputs, which may be used to compensate additional measured
quantities.
236
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IEC 61850 identification
CBCOMP
1MRK 511 557-UEN Rev. A
GUID-338790CD-B1E2-46FB-999C-E8DF65ABB542 v1
GUID-BDAEAFD0-D623-4DC3-B56E-5DE83A69B9AA v2
GUID-596AE73E-CFE2-4AB2-9115-0903949FD910 v3
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