IOB-80 industrial control module card NYQUIST module

IOB-80 industrial control module card NYQUIST module

Technical data of product parameters

If the generator star-point is inaccessible, the IOB-80 stator E/F protection is connected to three v.t’s at the generator terminals (see
Fig. 3.5.10.6). In this case, the E/F current is supplied by the
three v.t. primary windings. Assuming a permissible short-time
current of the primary windings of 5 A, the E/F current must be
limited to a maximum of 15 A.
A secondary rated voltage must be chosen such that the secondary voltage does not exceed 300 V and, if possible, the secondary current does not exceed 250 A.For an E/F at a generator terminal, the voltage of the phase
concerned becomes zero and the healthy phases are at phaseto-phase potential with respect to ground. The vectorial addition
of the two phase-to-phase voltages produces three times the
rated voltage across the broken delta IOB-80 connection of the v.t. secondary windingsIf a generator circuit-breaker is installed between the generator
and the step-up transformer, a second E/F protection scheme is
required for the zone between the step-up transformer and the
unit transformer. The second scheme is connected to the broken
delta secondary windings of three v.t’s. This scheme must also
remain stable for E/F’s on the HV system and during ferroresonance phenomena and for this reason there is a resistor across IOB-80
the broken delta as well. Frequently, the E/F protection is only
required to protect the cables and bar conductors, because the
transformers are protected by differential schemes and Buchholz
relays. In this case, the E/F protection setting is determined by
the voltage off-set for an E/F at the lowest load voltage. A typical
setting for reliable E/F detection in an ungrounded system is IOB-80
60 % UN, i.eThe rotor E/F function in conjunction with the ancillary unit Type
YWX 111 and 2 coupling capacitors is suitable for protecting
synchronous generators regardless of the excitation system in
use. The scheme operates according to the Wheatstone bridge
principle and is uninfluenced by frequency. The harmonics of the
excitation system do not therefore effect the rotor E/F protection.

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