ABB REG316 4 Series Operating Instructions Manual page 630

ABB Switzerland Ltd
Utility Automation
Application (cont'd)
Design
Numerical generator protection
Protection functions
All important protection functions required
for the protection of generators, motors and
unit transformers are included. The system
can therefore replace several relays of a con-
ventional protection scheme. The following
table gives a survey of the most significant
protection functions of REG316*4.
The desired protection functions to suit the
particular application can simply be selected
from a comprehensive library using the per-
sonal computer. No knowledge of program-
ming whatsoever is required.
All setting ranges are extremely wide to make
the protection functions suitable for a multi-
tude of applications. The following main pa-
rameters can be set, among others:
• input channel or channels
• pick-up setting
• time delay
• definition of the operating characteristics
• tripping logic
• control signal logic
Setting a corresponding parameter enables
the protection functions to be 'connected' to
particular input channels. Digital input and
output signals can also be connected together
logically:
• The tripping outputs of each protection
function can be allocated to channels of the
tripping auxiliary relay assembly in a man-
ner corresponding to a matrix.
• The pick-up and tripping signals can be al-
located to the channels of the signalling
auxiliary relay assembly.
• Provision is made for blocking each pro-
tection function with a digital signal (e. g.
digital inputs or the tripping signal of an-
other protection function).
The REG316*4 belongs to the generation of
fully numerical generator protection termi-
nals, i.e. analogue to digital conversion of the
input variables takes place immediately after
the input transformers and all further process-
ing of the resulting numerical signals is per-
formed by microprocessors and controlled by
programs.
Standard interfaces enable REG316*4 to
communicate with other control systems.
Provision is thus made for the exchange of
• External signals applied to the digital in-
puts can be processed in any desired fash-
ion.
• Digital signals can be combined to per-
form logical functions, e.g. external en-
abling or blocking signals with the output
signals of an internal protection function
and then used to block one of the other
protection functions.
Protection functions:
Generator differential
Transformer differential
Definite time overcurrent (undercurrent)
(optionally with inrush detection)
Instantaneous overcurrent (undercurrent)
Voltage-controlled overcurrent
Inverse time overcurrent
Directional overcurrent protection with definite
or inverse time characteristic
Negative phase sequence current
Definite time overvoltage (undervoltage)
Stator earth fault (95%)
Rotor earth fault
Instantaneous overvoltage (undervoltage)
with peak value evaluation
Voltage balance
100% stator earth fault (+ rotor earth fault)
Underimpedance
Minimum reactance (loss of excitation)
Power
Overload
Inverse negative phase-sequence current
Overtemperature
Frequency
df/dt
Overexcitation
Logical functions
Pole slip protection
data such as reactionless reporting of binary
states, events, measurements and protection
parameters or the activation of a different set
of settings by higher level control systems.
Because of its compact design, the very few
hardware units it needs, its modular software
and the integrated continuous self-diagnosis
and supervision functions, REG316*4 ideally
fulfils the user's expectations of a modern
protection terminal at a cost-effective price.
The AVAILABILITY of a terminal, i.e. the
REG316*4
1MRK502004-Ben
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