REG 316*4 1MRB520049-Uen / Rev. B
ABB Switzerland Ltd
4-11
I
E
HEST 935 007 FL
Internal E/F
I
2
I
2
I
E
R
2
Saturated c.t.
I >
R
S
D
U
i
VDR
Shorting contact
I >
R
S
External
E/F
Fig. 4.3
Restricted E/F protection of a Y connected trans-
former winding
4.2.2. Standstill
protection
4.2.2.1. General
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 stationary, 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, should the unit be connected to the system suddenly
under these conditions. Nevertheless, it must remain stable dur-
ing external faults and transients.
Standstill protection can be provided by a fast overcurrent or
power function. Function modules for both alternatives are in-
cluded in the REG 316*4 function library. The following example
shows the overcurrent alternative.
Summary of Contents for REG316 4 Series
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Page 427: ...REG 316 4 1MRB520049 Uen Rev B ABB Switzerland Ltd 4 29 Fig 4 13 Locus of the load angle d 90 ...
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