ABB SD812F 3BDH000014R1 control module DCS system

ABB SD812F 3BDH000014R1 control module DCS system

Technical data of product parameters

As a result of the current distribution for a through-fault, the starpoint c.t. conducts the highest current in the case of a solidly SD812F 3BDH000014R1
grounded transformer as shown in Fig. 4.2. Apart from the
burden, the high fault level results in a high c.t. flux and the
probability of it saturating is then also high.
The influence of through faults on the circulating current circuit is
limited, especially if the connections between the c.t. cores can
be kept short. It is for this reason, that phase faults are neglected when designing a scheme for a solidly grounded system.
Phase faults have to be taken into consideration, however,
where a system is impedance grounded.
The value of the stabilising resistor is chosen such that the voltage drop caused by the highest external E/F and possibly phasefault current across the secondary winding and leads of the SD812F 3BDH000014R1
saturated c.t. cannot reach the pick-up setting of the protectionThis current peak is visible in Fig. 4.4. A non-linear resistor,
Metrosil Type 600 A/S1/256, can be used to limit the peak
voltage. According to the characteristic shown in Fig. 4.5, the
peak current flowing through the resistor is 20 A at 900 V. Since
the current through a linear resistor of 300  at 900 V is 3 A, the
total current is 23 A. SD812F 3BDH000014R1
For a knee-point voltage of 200 V, the current through the nonlinear resistor during an internal fault is only 0.09 A, so that isbears no appreciable influence on the pick-up value.The purpose of the standstill protection is to isolate the generator from the system as quickly as possible, if it is connected to
the system by mistake, e.g. when at standstill, during start-up or
when running without voltage.
The protection must have a short operating time to minimise the
mechanical stress on the rotors and bearings of generator and
turbine, if the unit is suddenly connected to the system in these
circumstances. Nevertheless, it must remain stable during external faults and transients.
Standstill protection can be provided by a fast overcurrent or
power function. Function modules for both alternatives are included in the function library. The following example shows theovercurrent alternative.

Product picture display

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