Accumulated energy calculator
This module calculates the accumulated energy I
y
t [(kA)
y
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.
A071110 V1 EN
Figure 337: 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.
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 the limit value set with the LO Acc currents Pwr threshold setting, the
IPOW_LO output is activated.
The IPOW_ALM and IPOW_LO outputs can be blocked by activating the binary
input BLOCK.
7.1.4.6 Remaining life of circuit breaker
Every time the breaker operates, the life of the circuit breaker reduces due to
wearing. The wearing in the breaker depends on the tripping current, and the
remaining life of the breaker is estimated from the circuit breaker trip curve
1YHT530004D05 D Section 7
Condition monitoring functions
615 series 613
Technical Manual
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