ABB COM600 series User's & Technical Manual page 51

5.1 substation analytics

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1MRS758734

COM600 series 5.1

Substation Analytics Technical Manual

functional_module_diagram_for_circuit_breaker_gas_pressure_alarm.png

Figure 5.6-1 Functional module diagram for calculating accumulative energy and alarm

Accumulated energy calculator

This module calculates the accumulated energy I

t [(kA)

s]. The factor y is set with the

Current exponent setting.

The calculation is initiated with the POSCLOSE input opening events. It ends when the

RMS current becomes lower than the Acc stop current setting value.

significance_of_the_difference_cor_time_setting.png

Figure 5.6-2 Significance of the Difference Cor time setting

The Difference Cor time setting is used instead of the auxiliary contact to accumulate

the energy from the time the main contact opens. If the setting is positive, the calculation

of energy starts after the auxiliary contact has opened and when the delay is equal to the

value set with the Difference Cor time setting. When the setting is negative, the calculation

starts in advance by the correction time before the auxiliary contact opens.

The accumulated energy outputs IPOW_A (_B, _C) are available in the monitored data

view on the LHMI or through tools via communications. The values can be reset by

setting the parameter CB accum. currents power setting to true in the clear menu from

WHMI or LHMI. The set values will be taken into use when trigger application is next

time run.

Alarm limit check

The IPOW_ALM alarm is activated when the accumulated energy exceeds the value set

with the Alm Acc currents Pwr threshold setting. However, when the energy exceeds

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